Struct sozu_lib::buffer_queue::BufferQueue

pub struct BufferQueue {
    pub buffer_position: usize,
    pub parsed_position: usize,
    pub start_parsing_position: usize,
    pub buffer: Checkout,
    pub input_queue: Vec<InputElement>,
    pub output_queue: Vec<OutputElement>,
}

The BufferQueue has two roles: holding incoming data, and indicating which data will go out. When new data arrives, it is added at the end of the internal buffer. This new data is then eventually parsed or handled in some way by external code. The external code then adds element to the queue, indicating what to do with the data:

• copy a subset of the input data (and advance if needed)
• insert external data, like a HTTP header
• splice out of the kernel some data that was spliced in

position is the index in the stream of data already handled. it corresponds to the beginning of available data in the Buffer a Slice(begin, end) would point to buffer.data()[begin-position..end-position] (in the easiest case)

unparsed_position is the index in the stream of data that was not parsed yet

The buffer’s available data may be smaller than end - begin. It can happen if the parser indicated we need to copy more data than is available, like with a content length

should the buffer queue indicate how much data it needs?

Fields

buffer_position: usize

position of buffer start in stream

parsed_position: usize

start_parsing_position: usize

buffer: Checkout

input_queue: Vec<InputElement>

Vec<(start, length)>

output_queue: Vec<OutputElement>

Implementations

impl BufferQueue

pub fn with_buffer(buffer: Checkout) -> BufferQueue

pub fn invariant(&self)

pub fn available_input_data(&self) -> usize

pub fn sliced_input(&mut self, count: usize)

pub fn spliced_input(&mut self, count: usize)

pub fn needs_input(&self) -> bool

pub fn can_restart_parsing(&self) -> bool

pub fn empty(&self) -> bool

pub fn merge_input_slices(&self) -> usize

pub fn input_data_size(&self) -> usize

pub fn unparsed_data(&self) -> &[u8]

pub fn consume_parsed_data(&mut self, size: usize)

should only be called with a count inferior to self.input_data_size()

pub fn slice_output(&mut self, count: usize)

pub fn delete_output(&mut self, count: usize)

pub fn splice_output(&mut self, count: usize)

pub fn insert_output(&mut self, v: Vec<u8>)

pub fn has_output_data(&self) -> bool

pub fn output_data_size(&self) -> usize

pub fn merge_output_slices(&self) -> usize

pub fn merge_output_deletes(&self) -> usize

pub fn next_output_data(&self) -> &[u8]

pub fn as_ioslice(&self) -> Vec<IoSlice<'_>>

pub fn consume_output_data(&mut self, size: usize)

should only be called with a count inferior to self.input_data_size()

pub fn print_unparsed(&self)

pub fn print_and_consume_output(&mut self)

Trait Implementations

impl Debug for BufferQueue

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

Formats the value using the given formatter.

impl Reset for BufferQueue

fn reset(&mut self)

impl Write for BufferQueue

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

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

fn is_write_vectored(&self) -> bool

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

Determines if this Writer has an efficient write_vectored implementation.

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

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<(), Error>

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

Attempts to write multiple buffers into this writer.

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

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

fn by_ref(&mut self) -> &mut Selfwhere Self: Sized,

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