Struct wasmer_wasi::state::HostFile

pub struct HostFile {
    pub inner: File,
    pub host_path: PathBuf,
    // some fields omitted
}

A thin wrapper around std::fs::File

Fields

inner: File

host_path: PathBuf

Methods

impl HostFile

pub fn new(
    file: File,
    host_path: PathBuf,
    read: bool,
    write: bool,
    append: bool
) -> Self

creates a new host file from a std::fs::File and a path

pub fn metadata(&self) -> Metadata

Trait Implementations

impl WasiFile for HostFile

fn last_accessed(&self) -> u64

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

fn set_last_accessed(&self, _last_accessed: __wasi_timestamp_t)

set 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 set_last_modified(&self, _last_modified: __wasi_timestamp_t)

set 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_created_time(&self, _created_time: __wasi_timestamp_t)

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

fn size(&self) -> u64

the size of the file in bytes

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

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<(), WasiFsError>

Request deletion of the file

fn sync_to_disk(&self) -> Result<(), WasiFsError>

Store file contents and metadata to disk

fn rename_file(&self, new_name: &Path) -> Result<(), WasiFsError>

Moves the file to a new location NOTE: the signature of this function will change before stabilization

fn bytes_available(&self) -> Result<usize, WasiFsError>

Returns the number of bytes available. This function must not block

fn get_raw_fd(&self) -> Option<i32>

Used for polling. Default returns None because this method cannot be implemented for most types Returns the underlying host fd

impl Debug for HostFile

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

Formats the value using the given formatter.

impl Seek for HostFile

fn seek(&mut self, pos: SeekFrom) -> Result<u64>

Seek to an offset, in bytes, in a stream.

fn stream_len(&mut self) -> Result<u64, Error>

🔬 This is a nightly-only experimental API. (seek_convenience)

Returns the length of this stream (in bytes).

fn stream_position(&mut self) -> Result<u64, Error>

🔬 This is a nightly-only experimental API. (seek_convenience)

Returns the current seek position from the start of the stream.

impl Write for HostFile

fn write(&mut self, buf: &[u8]) -> Result<usize>

Write a buffer into this writer, returning how many bytes were written.

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

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn write_all(&mut self, buf: &[u8]) -> Result<()>

Attempts to write an entire buffer into this writer.

fn write_fmt(&mut self, fmt: Arguments) -> Result<()>

Writes a formatted string into this writer, returning any error encountered.

fn write_vectored(&mut self, bufs: &[IoSlice]) -> Result<usize, Error>

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

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Write.

impl Read for HostFile

fn read(&mut self, buf: &mut [u8]) -> Result<usize>

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>

Read all bytes until EOF in this source, placing them into buf.

fn read_to_string(&mut self, buf: &mut String) -> Result<usize>

Read all bytes until EOF in this source, appending them to buf.

fn read_exact(&mut self, buf: &mut [u8]) -> Result<()>

Read the exact number of bytes required to fill buf.

fn read_vectored(&mut self, bufs: &mut [IoSliceMut]) -> Result<usize, Error>

Like read, except that it reads into a slice of buffers.

unsafe fn initializer(&self) -> Initializer

🔬 This is a nightly-only experimental API. (read_initializer)

Determines if this Reader can work with buffers of uninitialized memory.

fn by_ref(&mut self) -> &mut Self

Creates a "by reference" adaptor for this instance of Read.

fn bytes(self) -> Bytes<Self>

Transforms this Read instance to an [Iterator] over its bytes.

fn chain<R>(self, next: R) -> Chain<Self, R> where
    R: Read, 

Creates an adaptor which will chain this stream with another.

fn take(self, limit: u64) -> Take<Self>

Creates an adaptor which will read at most limit bytes from it.

impl<'de> Deserialize<'de> for HostFile

fn deserialize<D>(deserializer: D) -> Result<HostFile, D::Error> where
    D: Deserializer<'de>, 

Deserialize this value from the given Serde deserializer.

impl Serialize for HostFile

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error> where
    __S: Serializer, 

Serialize this value into the given Serde serializer.