Day 22: No More Heap Hoarding

“Blitzen, do you realize every single read_to_string() call triggers a fresh heap allocation? Do you think we’ve got infinite memory lying around?”

Here, I called it a few times and the process is taking up 1.5GB of memory, you think this is acceptable?

Blitzen glanced up, nonchalant. “Heap allocations happen, Santa. That’s life.”

Santa’s eyes narrowed. “Do you want the nightmare of Day 1 all over again? That disaster was just a simple string clone, and it nearly broke us. This? This is worse. Way worse. I don’t want to end up manually running drop() just to keep things from spiraling into chaos!”

Blitzen stiffened, finally taking the hint. “Okay, okay. What do you want me to do?”

Prancer cut in cautiously. “Why not cache the file content on every write? And return a reference to the cached content on every read?”

Blitzen nodded slowly. “Yeah, that’ll work. No more redundant allocations, no stale reads, and we don’t touch drop() at all.”

Santa’s glare softened—marginally. “Good. Make it lean, make it fast, and make sure it’s ready by sunrise. We don't have much time, Christmas is just around the corner.”

Your Mission

Santa's files are huge, and they use a lot of memory, To prevent that we need to create a new method named read_to_str that will return a string slice instead of an owned value.

Here is what you need to do:

Create a new field called content
Update the write method to update the content on every write
Complete the read_from_cache method to return a string slice instead of an owned value

Hints

If you’re unsure where to start, take a look at these tips:

Click to reveal hints!

Create a new field called content to store the file content

pub struct TempFile {
    file: File,
    file_path: PathBuf,
    content: Vec<u8>,
}

Update the field in file writes, use to_vec() to turn a &[u8] to a Vec<u8>
```
self.content = data.to_vec();
```
Use the std::str::from_utf8 function to convert a &[u8] to a &str
```
std::str::from_utf8(&self.content).unwrap_or("")
```

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Solutions

Ljungg

5 hours ago

5.12ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = vec![];
        Ok(Self {
            file_path,
            file,
            content,
        })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
        // 3. Update this method to return the content as a string slice
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Aaron

aaron-otis

5 hours ago

4.54ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    context: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, context: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.context = data.to_vec();
        //self.context.extend_from_slice(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.context).unwrap_or("can't read buffer")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        Ok(self.read_from_cache().to_string())
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Joseph Copenhaver

josephcopenhaver

8 hours ago

5.86ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::Write;
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str::from_utf8;
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::<u8>::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content.clear();
        // this is bad but the tests pass
        //
        // ideally no memory would be allocated in the cache
        // until a read_to_string occurs
        self.content.extend_from_slice(data);
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        from_utf8(&self.content[..]).expect("not utf8")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        // let mut buf = String::new();
        // self.file.seek(std::io::SeekFrom::Start(0))?;
        // self.file.read_to_string(&mut buf)?;
        // Ok(buf)
        Ok(self.read_from_cache().to_owned())
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Denis

overplumbum

9 hours ago

5.86ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path: file_path, file: file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

The Scooby

thescooby

9 hours ago

5.15ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = Vec::new();
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Morse

A1-exe

10 hours ago

4.77ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile<'a> {
    file_path: PathBuf,
    file: File,
    content: &'a [u8]    
}
impl<'a> TempFile<'a> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = &[];
        Ok(Self { file_path, file, content })
    }
    pub fn write(&mut self, data: &'a [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl<'a> Drop for TempFile<'a> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Rickard Jensen

rjensen

12 hours ago

4.94ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

kosay

sarub0b0

13 hours ago

5.41ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Florian Gaudin-Delrieu

FlorianGD

13 hours ago

7.06ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        std::fs::write(&self.file_path, data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Habu

habu1010

14 hours ago

5.47ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Mingzhe Yang

mei28

15 hours ago

5.43ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content:Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file , content:vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content.clear();
        self.content.extend_from_slice(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

sweet2honey

15 hours ago

5.67ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,// 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = vec![];
        
        Ok(Self { file_path, file, content})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

pagyeman

16 hours ago

5.32ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,// 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = vec![];
        
        Ok(Self { file_path, file, content})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

vaclav0411

17 hours ago

5.91ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        
        let content = vec![];
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content.clear();
        self.content.extend_from_slice(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

PangoSea

kapaseker

19 hours ago

6.83ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content:Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file , content:vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content.clear();
        self.content.extend_from_slice(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Wendy Kong

wendko

a day ago

4.46ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content: Vec<u8> = vec![];
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Emmanuel Guefif

eguefif

a day ago

4.93ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: String,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: String::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content.clear();
        self.content.push_str(String::from_utf8(Vec::from(data)).unwrap().as_str());
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        self.content.as_str()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Marius Gehrmann

MGehrmann

a day ago

5.09ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        return std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Kushneryk Pavel

KushnerykPavel

a day ago

5.59ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Vladimir Fedorov

Fedott

a day ago

5.48ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

hafihaf123

a day ago

4.81ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content)
            .unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Claus Guttesen

kometen

a day ago

5.32ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content: Vec<u8> = Vec::new();
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Tim Toebrock

titoeb

2 days ago

4.61ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: String, // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self {
            file_path,
            file,
            content: String::new(),
        })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content.clear();
        self.content
            .push_str(&String::from_utf8(data.into()).unwrap());
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        self.content.as_str()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}
fn main() {}

Joanne Muthoni

joanne-cmd

2 days ago

7.31ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![]})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Stefano Cianciulli

CianciuStyles

2 days ago

5.06ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = vec!();
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

gmvar

2 days ago

4.81ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Guilherme Cesário Strachan

strachan

2 days ago

8.74ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Sukrit Amornpornwiwat

arm01846

2 days ago

6.12ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![]})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Masayuki Sunahara

tamanishi

2 days ago

5.00ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Ankit Kumar Jha

Ankit8848

2 days ago

5.19ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        return std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

vihamaki

2 days ago

6.02ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        return std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Dominic

DominicD

2 days ago

7.76ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::default() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = Vec::from(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
         str::from_utf8(self.content.as_slice()).unwrap()
         
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Frank

frankstolle

2 days ago

5.43ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content:Vec<u8>,
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content:vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Rounak Sen

rony0000013

2 days ago

5.78ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile<'a> {
    file_path: PathBuf,
    file: File,
    content: &'a [u8],
}
impl<'a> TempFile<'a> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = &[];
        Ok(Self { file_path, file, content })
    }
    pub fn write(&mut self, data: &'a [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl<'a> Drop for TempFile<'a> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Stephan Lindner

Stephan-Lindner

2 days ago

5.46ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile<'a> {
    file_path: PathBuf,
    file: File,
    content: &'a [u8],
}
impl<'a> TempFile<'a> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = &[];
        Ok(Self { file_path, file, content })
    }
    pub fn write(&mut self, data: &'a [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl<'a> Drop for TempFile<'a> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Njerii

wamimi

2 days ago

5.66ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { 
            file_path, 
            file,
            content: Vec::new(),
        })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.file.flush()?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Chris

chriswmann

2 days ago

4.77ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile<'c> {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: &'c [u8],
}
impl<'c> TempFile<'c> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: &[]})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &'c [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile<'_> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Chris

chriswmann

2 days ago

6.18ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile<'c> {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: &'c str,
}
impl<'c> TempFile<'c> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: ""})
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &'c [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = std::str::from_utf8(data).unwrap();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        self.content
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile<'_> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Gerald Joachim den Hertog

gjdenhertog

3 days ago

5.68ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str::from_utf8;
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: "".into() })
    }
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Holger Rapp

SirVer

3 days ago

6.18ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

KLcpb

3 days ago

4.38ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content:vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = data.to_vec();
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Will LaBranche

wlabranche

3 days ago

5.28ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = Vec::new();
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("Something bad happened")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Jean-Roland Gosse

jean-roland

3 days ago

5.42ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let content = Vec::new();
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Burnus

3 days ago

5.42ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: String,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: String::new(), })
    }
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.content = String::from_utf8(data.to_vec()).expect("Error caching non-UTF-8 content");
        self.file.write_all(data)?;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        &self.content[..]
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Tõnis Kevvai

tonisk

3 days ago

5.86ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
    // 1. Add a new field named `content` with a valid type
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Luis Linares

lulingar

3 days ago

5.00ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    /* The commented-out lines are for an implementation that
       should be what is expected from the problem's statement.
       However it seems the behavior expected by tests is
       different, so it is what remains uncommented. 
    */
    content: Vec<u8>,
    //content: String,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, 
            content: Vec::new(),
            //content: String::new(),
            })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    /*
    This implementation would make more sense for the
    stated purpose: cache **the entire** content of the file
    
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        let as_str = std::str::from_utf8(data)
            .map_err(|op| {
                std::io::Error::new(
                    std::io::ErrorKind::InvalidData,
                    op.to_string())
                }
            )?;
        Ok(self.content.push_str(as_str))
    }
    pub fn read_from_cache(&self) -> &str {
        self.content.as_str()
    }
    */
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Giuliano

GiulianoCTRL

4 days ago

4.60ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        
        let content: Vec<u8> = Vec::new();
        Ok(Self { file_path, file, content })
    }
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

Ben Kreeger

kreeger

4 days ago

4.93ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: vec![] })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data.to_vec();
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

David Cohen

osimarr

4 days ago

5.09ms

88.04kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
pub struct TempFile {
    file_path: PathBuf,
    file: File,
    // 1. Add a new field named `content` with a valid type
    content: Vec<u8>,
}
impl TempFile {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        Ok(Self { file_path, file, content: Vec::new() })
    }
    // 2. Change this method to update the `content` field on every write
    pub fn write(&mut self, data: &[u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = Vec::from(data);
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        // 3. Update this method to return the content as a string slice
        std::str::from_utf8(&self.content).unwrap_or("")
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl Drop for TempFile {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}

sriharsha madala

sriharshamadala

4 days ago

4.12ms

87.99kb

use std::fs::{remove_file, File, OpenOptions};
use std::io::{Read, Seek, Write};
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use std::str;
pub struct TempFile<'a> {
    file_path: PathBuf,
    file: File,
    content: &'a [u8]    
}
impl<'a> TempFile<'a> {
    pub fn new() -> Result<Self, std::io::Error> {
        let temp_dir = std::env::temp_dir();
        let random_number: u64 = {
            let start = SystemTime::now();
            let since_epoch = start.duration_since(UNIX_EPOCH).unwrap();
            since_epoch.as_nanos() as u64
        };
        let file_name = format!("tempfile-{}.tmp", random_number);
        let file_path = temp_dir.join(file_name);
        let file = OpenOptions::new()
            .read(true)
            .write(true)
            .create(true)
            .open(&file_path)?;
        let content = &[];
        Ok(Self { file_path, file, content })
    }
    pub fn write(&mut self, data: &'a [u8]) -> Result<(), std::io::Error> {
        self.file.write_all(data)?;
        self.content = data;
        Ok(())
    }
    pub fn read_from_cache(&self) -> &str {
        str::from_utf8(&self.content).unwrap()
    }
    pub fn read_to_string(&mut self) -> Result<String, std::io::Error> {
        let mut buf = String::new();
        self.file.seek(std::io::SeekFrom::Start(0))?;
        self.file.read_to_string(&mut buf)?;
        Ok(buf)
    }
    pub fn path(&self) -> &PathBuf {
        &self.file_path
    }
    pub fn file(&self) -> &File {
        &self.file
    }
}
impl<'a> Drop for TempFile<'a> {
    fn drop(&mut self) {
        let _ = remove_file(&self.file_path);
    }
}