Struct RemoteReader 

pub struct RemoteReader { /* private fields */ }

A remote file reader with HTTP range request support and caching.

This reader fetches data from HTTP/HTTPS URLs on demand, caching blocks to minimize network traffic. It implements Read and Seek for random access to remote files.

Caching

The reader caches 64KB blocks. When data is requested, it fetches the entire block containing that position, serving subsequent reads from the same range from the cache.

Example

use fastx::remote::RemoteReader;

let reader = RemoteReader::new("https://example.com/data.fasta.gz").unwrap();

Implementations

impl RemoteReader

pub fn new(url: impl Into<String>) -> Result<Self>

Create a new remote reader for the given URL.

Arguments

• url - The HTTP/HTTPS URL to read from

Returns

• Ok(reader) - The remote reader ready for use
• Err(io::Error) - If the URL is invalid or the request fails

Example

use fastx::remote::RemoteReader;

let reader = RemoteReader::new("https://example.com/data.fasta.gz").unwrap();

pub fn with_block_size(self, size: u64) -> Self

Set the block size for caching.

Larger blocks reduce the number of HTTP requests but use more memory.

Arguments

• size - Block size in bytes

Trait Implementations

impl Read for RemoteReader

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_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> Result<usize, Error>

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

fn is_read_vectored(&self) -> bool

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

Determines if this Reader has an efficient read_vectored implementation.

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

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

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

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

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

Reads the exact number of bytes required to fill buf.

fn read_buf(&mut self, buf: BorrowedCursor<'_>) -> Result<(), Error>

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

Pull some bytes from this source into the specified buffer.

fn read_buf_exact(&mut self, cursor: BorrowedCursor<'_>) -> Result<(), Error>

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

Reads the exact number of bytes required to fill cursor.

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

where Self: Sized,

Creates a “by reference” adapter for this instance of Read.

fn bytes(self) -> Bytes<Self>

where Self: Sized,

Transforms this Read instance to an Iterator over its bytes.

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

where R: Read, Self: Sized,

Creates an adapter which will chain this stream with another.

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

where Self: Sized,

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

fn read_array<const N: usize>(&mut self) -> Result<[u8; N], Error>

where Self: Sized,

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

Read and return a fixed array of bytes from this source.

impl Seek for RemoteReader

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

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

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

Rewind to the beginning of a stream.

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

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

Returns the length of this stream (in bytes).

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

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

fn seek_relative(&mut self, offset: i64) -> Result<(), Error>

Seeks relative to the current position.