Struct keclc_file::NamedFile

pub struct NamedFile { /* fields omitted */ }

A file with an associated name.

Methods

impl NamedFile

pub fn from_file<P: AsRef<Path>>(file: File, path: P) -> Result<NamedFile>

Creates an instance from a previously opened file.

The given path need not exist and is only used to determine the ContentType and ContentDisposition headers.

Examples

use keclc_file::NamedFile;
use std::io::{self, Write};
use std::env;
use std::fs::File;

fn main() -> io::Result<()> {
    let mut file = File::create("foo.txt")?;
    file.write_all(b"Hello, world!")?;
    let named_file = NamedFile::from_file(file, "bar.txt")?;
    Ok(())
}

pub fn open<P: AsRef<Path>>(path: P) -> Result<NamedFile>

Attempts to open a file in read-only mode.

Examples

use keclc_file::NamedFile;

let file = NamedFile::open("foo.txt");

pub fn file(&self) -> &File

Returns reference to the underlying File object.

pub fn path(&self) -> &Path

Retrieve the path of this file.

Examples

use keclc_file::NamedFile;

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

pub fn set_status_code(self, status: StatusCode) -> Self

Set response Status Code

pub fn set_content_type(self, mime_type: Mime) -> Self

Set the MIME Content-Type for serving this file. By default the Content-Type is inferred from the filename extension.

pub fn set_content_disposition(self, cd: ContentDisposition) -> Self

Set the Content-Disposition for serving this file. This allows changing the inline/attachment disposition as well as the filename sent to the peer. By default the disposition is inline for text, image, and video content types, and attachment otherwise, and the filename is taken from the path provided in the open method after converting it to UTF-8 using. to_string_lossy.

pub fn disable_content_disposition(self) -> Self

Disable Content-Disposition header.

By default Content-Disposition` header is enabled.

pub fn set_content_encoding(self, enc: ContentEncoding) -> Self

Set content encoding for serving this file

pub fn use_etag(self, value: bool) -> Self

Specifies whether to use ETag or not.

Default is true.

pub fn use_last_modified(self, value: bool) -> Self

Specifies whether to use Last-Modified or not.

Default is true.

pub fn into_response(self, req: &HttpRequest) -> Result<HttpResponse, Error>

Methods from Deref<Target = File>

pub fn sync_all(&self) -> Result<(), Error>

Attempts to sync all OS-internal metadata to disk.

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

This can be used to handle errors that would otherwise only be caught when the File is closed. Dropping a file will ignore errors in synchronizing this in-memory data.

Examples

use std::fs::File;
use std::io::prelude::*;

fn main() -> std::io::Result<()> {
    let mut f = File::create("foo.txt")?;
    f.write_all(b"Hello, world!")?;

    f.sync_all()?;
    Ok(())
}

pub fn sync_data(&self) -> Result<(), Error>

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 std::fs::File;
use std::io::prelude::*;

fn main() -> std::io::Result<()> {
    let mut f = File::create("foo.txt")?;
    f.write_all(b"Hello, world!")?;

    f.sync_data()?;
    Ok(())
}

pub fn set_len(&self, size: u64) -> Result<(), Error>

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.

The file's cursor isn't changed. In particular, if the cursor was at the end and the file is shrunk using this operation, the cursor will now be past the end.

Errors

This function will return an error if the file is not opened for writing. Also, std::io::ErrorKind::InvalidInput will be returned if the desired length would cause an overflow due to the implementation specifics.

Examples

use std::fs::File;

fn main() -> std::io::Result<()> {
    let mut f = File::create("foo.txt")?;
    f.set_len(10)?;
    Ok(())
}

Note that this method alters the content of the underlying file, even though it takes &self rather than &mut self.

pub fn metadata(&self) -> Result<Metadata, Error>

Queries metadata about the underlying file.

Examples

use std::fs::File;

fn main() -> std::io::Result<()> {
    let mut f = File::open("foo.txt")?;
    let metadata = f.metadata()?;
    Ok(())
}

pub fn try_clone(&self) -> Result<File, Error>

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

Creates two handles for a file named foo.txt:

use std::fs::File;

fn main() -> std::io::Result<()> {
    let mut file = File::open("foo.txt")?;
    let file_copy = file.try_clone()?;
    Ok(())
}

Assuming there’s a file named foo.txt with contents abcdef\n, create two handles, seek one of them, and read the remaining bytes from the other handle:

use std::fs::File;
use std::io::SeekFrom;
use std::io::prelude::*;

fn main() -> std::io::Result<()> {
    let mut file = File::open("foo.txt")?;
    let mut file_copy = file.try_clone()?;

    file.seek(SeekFrom::Start(3))?;

    let mut contents = vec![];
    file_copy.read_to_end(&mut contents)?;
    assert_eq!(contents, b"def\n");
    Ok(())
}

pub fn set_permissions(&self, perm: Permissions) -> Result<(), Error>

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

fn main() -> std::io::Result<()> {
    use std::fs::File;

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

Note that this method alters the permissions of the underlying file, even though it takes &self rather than &mut self.

Trait Implementations

impl Debug for NamedFile

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Deref for NamedFile

type Target = File

The resulting type after dereferencing.

fn deref(&self) -> &File

Dereferences the value.

impl DerefMut for NamedFile

fn deref_mut(&mut self) -> &mut File

Mutably dereferences the value.

impl Responder for NamedFile

type Error = Error

The associated error which can be returned.

type Future = Ready<Result<HttpResponse, Error>>

The future response value.

fn respond_to(self, req: &HttpRequest) -> Self::Future

Convert itself to AsyncResult or Error.

fn with_status(self, status: StatusCode) -> CustomResponder<Self>

Override a status code for a Responder.

fn with_header<K, V>(self, key: K, value: V) -> CustomResponder<Self> where
    V: IntoHeaderValue,
    HeaderName: TryFrom<K>,
    <HeaderName as TryFrom<K>>::Error: Into<Error>, 

Add header to the Responder's response.