Struct sea_streamer_file::FileReader

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pub struct FileReader { /* private fields */ }
Expand description

A simple buffered and bounded file reader. The implementation is much simpler than FileSource.

FileReader treats file as a fixed depot of bytes. Attempt to read beyond the end will result in a NotEnoughBytes error.

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impl FileReader

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pub async fn new(file_id: FileId) -> Result<Self, FileErr>

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pub async fn seek(&mut self, to: SeqPos) -> Result<u64, FileErr>

Seek the file stream to a different position. SeqNo is regarded as byte offset. Returns the file offset after sought.

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pub fn offset(&self) -> u64

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pub fn file_size(&self) -> u64

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pub async fn resize(&mut self) -> Result<u64, FileErr>

Trait Implementations§

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impl ByteSource for FileReader

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fn request_bytes(&mut self, size: usize) -> Self::Future<'_>

Read N bytes from file. If there is not enough bytes, it will return NotEnoughBytes error.

If there are enough bytes in the buffer, it yields immediately.

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type Future<'a> = Pin<Box<dyn Future<Output = Result<Bytes, FileErr>> + Send + 'a>>

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.