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pub struct NamedFile(_, _);
Expand description

A Responder that sends file data with a Content-Type based on its file extension.

Example

A simple static file server mimicking FileServer:

use std::path::{PathBuf, Path};

use rocket::fs::{NamedFile, relative};

#[get("/file/<path..>")]
pub async fn second(path: PathBuf) -> Option<NamedFile> {
    let mut path = Path::new(relative!("static")).join(path);
    if path.is_dir() {
        path.push("index.html");
    }

    NamedFile::open(path).await.ok()
}

Always prefer to use FileServer which has more functionality and a pithier API.

Implementations

Attempts to open a file in read-only mode.

Errors

This function will return an error if path does not already exist. Other errors may also be returned according to OpenOptions::open().

Example
use rocket::fs::NamedFile;

#[get("/")]
async fn index() -> Option<NamedFile> {
    NamedFile::open("index.html").await.ok()
}

Retrieve the underlying File.

Example
use rocket::fs::NamedFile;

let named_file = NamedFile::open("index.html").await?;
let file = named_file.file();

Retrieve a mutable borrow to the underlying File.

Example
use rocket::fs::NamedFile;

let mut named_file = NamedFile::open("index.html").await?;
let file = named_file.file_mut();

Take the underlying File.

Example
use rocket::fs::NamedFile;

let named_file = NamedFile::open("index.html").await?;
let file = named_file.take_file();

Retrieve the path of this file.

Examples
use rocket::fs::NamedFile;

let file = NamedFile::open("foo.txt").await?;
assert_eq!(file.path().as_os_str(), "foo.txt");

Methods from Deref<Target = File>

Attempts to sync all OS-internal metadata to disk.

This function will attempt to ensure that all in-core data reaches the filesystem before returning.

Examples
use tokio::fs::File;
use tokio::io::AsyncWriteExt;

let mut file = File::create("foo.txt").await?;
file.write_all(b"hello, world!").await?;
file.sync_all().await?;

The write_all method is defined on the AsyncWriteExt trait.

This function is similar to sync_all, except that it may not synchronize file metadata to the filesystem.

This is intended for use cases that must synchronize content, but don’t need the metadata on disk. The goal of this method is to reduce disk operations.

Note that some platforms may simply implement this in terms of sync_all.

Examples
use tokio::fs::File;
use tokio::io::AsyncWriteExt;

let mut file = File::create("foo.txt").await?;
file.write_all(b"hello, world!").await?;
file.sync_data().await?;

The write_all method is defined on the AsyncWriteExt trait.

Truncates or extends the underlying file, updating the size of this file to become size.

If the size is less than the current file’s size, then the file will be shrunk. If it is greater than the current file’s size, then the file will be extended to size and have all of the intermediate data filled in with 0s.

Errors

This function will return an error if the file is not opened for writing.

Examples
use tokio::fs::File;
use tokio::io::AsyncWriteExt;

let mut file = File::create("foo.txt").await?;
file.write_all(b"hello, world!").await?;
file.set_len(10).await?;

The write_all method is defined on the AsyncWriteExt trait.

Queries metadata about the underlying file.

Examples
use tokio::fs::File;

let file = File::open("foo.txt").await?;
let metadata = file.metadata().await?;

println!("{:?}", metadata);

Creates a new File instance that shares the same underlying file handle as the existing File instance. Reads, writes, and seeks will affect both File instances simultaneously.

Examples
use tokio::fs::File;

let file = File::open("foo.txt").await?;
let file_clone = file.try_clone().await?;

Changes the permissions on the underlying file.

Platform-specific behavior

This function currently corresponds to the fchmod function on Unix and the SetFileInformationByHandle function on Windows. Note that, this may change in the future.

Errors

This function will return an error if the user lacks permission change attributes on the underlying file. It may also return an error in other os-specific unspecified cases.

Examples
use tokio::fs::File;

let file = File::open("foo.txt").await?;
let mut perms = file.metadata().await?.permissions();
perms.set_readonly(true);
file.set_permissions(perms).await?;

Trait Implementations

Formats the value using the given formatter. Read more

The resulting type after dereferencing.

Dereferences the value.

Mutably dereferences the value.

Streams the named file to the client. Sets or overrides the Content-Type in the response according to the file’s extension if the extension is recognized. See ContentType::from_extension() for more information. If you would like to stream a file with a different Content-Type than that implied by its extension, use a File directly.

Returns Ok if a Response could be generated successfully. Otherwise, returns an Err with a failing Status. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Converts self into a collection.

Should always be Self

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more