Trait WasiFile

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pub trait WasiFile:
    Debug
    + Write
    + Read
    + Seek
    + Upcastable {
    // Required methods
    fn last_accessed(&self) -> u64;
    fn last_modified(&self) -> u64;
    fn created_time(&self) -> u64;
    fn size(&self) -> u64;
    fn set_len(&mut self, new_size: u64) -> Result<(), FsError>;
    fn unlink(&mut self) -> Result<(), FsError>;

    // Provided methods
    fn sync_to_disk(&self) -> Result<(), FsError> { ... }
    fn bytes_available(&self) -> Result<usize, FsError> { ... }
    fn bytes_available_read(&self) -> Result<Option<usize>, FsError> { ... }
    fn bytes_available_write(&self) -> Result<Option<usize>, FsError> { ... }
    fn is_open(&self) -> bool { ... }
    fn get_fd(&self) -> Option<FileDescriptor> { ... }
}

Expand description

This trait relies on your file closing when it goes out of scope via Drop

Required Methods§

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fn last_accessed(&self) -> u64

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

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fn last_modified(&self) -> u64

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

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fn created_time(&self) -> u64

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

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fn size(&self) -> u64

the size of the file in bytes

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

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

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

Request deletion of the file

Provided Methods§

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

Store file contents and metadata to disk Default implementation returns Ok(()). You should implement this method if you care about flushing your cache to permanent storage

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