Struct virtual_fs::dual_write_file::DualWriteFile

pub struct DualWriteFile {
    inner: Box<dyn VirtualFile + Send + Sync + 'static>,
    extra_write: Box<dyn FnMut(&[u8]) + Send + Sync + 'static>,
}

Wraps a VirtualFile, and also invokes a provided function for each write.

Useful for debugging.

Fields

inner: Box<dyn VirtualFile + Send + Sync + 'static>

extra_write: Box<dyn FnMut(&[u8]) + Send + Sync + 'static>

Implementations

impl DualWriteFile

pub fn new( inner: Box<dyn VirtualFile + Send + Sync + 'static>, funct: impl FnMut(&[u8]) + Send + Sync + 'static, ) -> Self

Trait Implementations

impl AsyncRead for DualWriteFile

fn poll_read( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut ReadBuf<'_>, ) -> Poll<Result<()>>

Attempts to read from the AsyncRead into buf.

impl AsyncSeek for DualWriteFile

fn start_seek(self: Pin<&mut Self>, position: SeekFrom) -> Result<()>

Attempts to seek to an offset, in bytes, in a stream.

fn poll_complete( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<u64>>

Waits for a seek operation to complete.

impl AsyncWrite for DualWriteFile

fn poll_write( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8], ) -> Poll<Result<usize>>

Attempt to write bytes from buf into the object.

fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Attempts to flush the object, ensuring that any buffered data reach their destination.

fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>>

Initiates or attempts to shut down this writer, returning success when the I/O connection has completely shut down.

fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>], ) -> Poll<Result<usize, Error>>

Like poll_write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

Determines if this writer has an efficient poll_write_vectored implementation.

impl Debug for DualWriteFile

fn fmt(&self, __derive_more_f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl VirtualFile for DualWriteFile

fn last_accessed(&self) -> u64

the last time the file was accessed in nanoseconds as a UNIX timestamp

fn last_modified(&self) -> u64

the last time the file was modified in nanoseconds as a UNIX timestamp

fn created_time(&self) -> u64

the time at which the file was created in nanoseconds as a UNIX timestamp

fn set_times(&mut self, atime: Option<u64>, mtime: Option<u64>) -> Result<()>

sets accessed and modified time

fn size(&self) -> u64

the size of the file in bytes

fn set_len(&mut self, new_size: u64) -> Result<()>

Change the size of the file, if the new_size is greater than the current size the extra bytes will be allocated and zeroed

fn unlink(&mut self) -> Result<()>

Request deletion of the file

fn poll_read_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize>>

Polls the file for when there is data to be read

fn poll_write_ready( self: Pin<&mut Self>, cx: &mut Context<'_>, ) -> Poll<Result<usize>>

Polls the file for when it is available for writing

fn is_open(&self) -> bool

Indicates if the file is opened or closed. This function must not block Defaults to a status of being constantly open

fn get_special_fd(&self) -> Option<u32>

Used for “special” files such as stdin, stdout and stderr. Always returns the same file descriptor (0, 1 or 2). Returns None on normal files

fn write_from_mmap(&mut self, _offset: u64, _len: u64) -> Result<()>

Writes to this file using an mmap offset and reference (this method only works for mmap optimized file systems)

fn copy_reference( &mut self, src: Box<dyn VirtualFile + Send + Sync + 'static>, ) -> BoxFuture<'_, Result<()>>

This method will copy a file from a source to this destination where the default is to do a straight byte copy however file system implementors may optimize this to do a zero copy