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| <a href="#769" id="769">769</a> |
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| <a href="#771" id="771">771</a> |
| <a href="#772" id="772">772</a> |
| <a href="#773" id="773">773</a> |
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| <a href="#779" id="779">779</a> |
| <a href="#780" id="780">780</a> |
| <a href="#781" id="781">781</a> |
| </pre></div><pre class="rust"><code><span class="comment">// Copyright (C) 2023, Cloudflare, Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // * Redistributions in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| </span><span class="kw">use </span>std::cmp; |
| |
| <span class="kw">use </span>std::collections::VecDeque; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::Error; |
| <span class="kw">use </span><span class="kw">crate</span>::Result; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::ranges; |
| |
| <span class="kw">use </span><span class="kw">super</span>::RangeBuf; |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">const </span>SEND_BUFFER_SIZE: usize = <span class="number">5</span>; |
| |
| <span class="attr">#[cfg(not(test))] |
| </span><span class="kw">const </span>SEND_BUFFER_SIZE: usize = <span class="number">4096</span>; |
| |
| <span class="doccomment">/// Send-side stream buffer. |
| /// |
| /// Stream data scheduled to be sent to the peer is buffered in a list of data |
| /// chunks ordered by offset in ascending order. Contiguous data can then be |
| /// read into a slice. |
| /// |
| /// By default, new data is appended at the end of the stream, but data can be |
| /// inserted at the start of the buffer (this is to allow data that needs to be |
| /// retransmitted to be re-buffered). |
| </span><span class="attr">#[derive(Debug, Default)] |
| </span><span class="kw">pub struct </span>SendBuf { |
| <span class="doccomment">/// Chunks of data to be sent, ordered by offset. |
| </span>data: VecDeque<RangeBuf>, |
| |
| <span class="doccomment">/// The index of the buffer that needs to be sent next. |
| </span>pos: usize, |
| |
| <span class="doccomment">/// The maximum offset of data buffered in the stream. |
| </span>off: u64, |
| |
| <span class="doccomment">/// The maximum offset of data sent to the peer, regardless of |
| /// retransmissions. |
| </span>emit_off: u64, |
| |
| <span class="doccomment">/// The amount of data currently buffered. |
| </span>len: u64, |
| |
| <span class="doccomment">/// The maximum offset we are allowed to send to the peer. |
| </span>max_data: u64, |
| |
| <span class="doccomment">/// The last offset the stream was blocked at, if any. |
| </span>blocked_at: <span class="prelude-ty">Option</span><u64>, |
| |
| <span class="doccomment">/// The final stream offset written to the stream, if any. |
| </span>fin_off: <span class="prelude-ty">Option</span><u64>, |
| |
| <span class="doccomment">/// Whether the stream's send-side has been shut down. |
| </span>shutdown: bool, |
| |
| <span class="doccomment">/// Ranges of data offsets that have been acked. |
| </span>acked: ranges::RangeSet, |
| |
| <span class="doccomment">/// The error code received via STOP_SENDING. |
| </span>error: <span class="prelude-ty">Option</span><u64>, |
| } |
| |
| <span class="kw">impl </span>SendBuf { |
| <span class="doccomment">/// Creates a new send buffer. |
| </span><span class="kw">pub fn </span>new(max_data: u64) -> SendBuf { |
| SendBuf { |
| max_data, |
| ..SendBuf::default() |
| } |
| } |
| |
| <span class="doccomment">/// Inserts the given slice of data at the end of the buffer. |
| /// |
| /// The number of bytes that were actually stored in the buffer is returned |
| /// (this may be lower than the size of the input buffer, in case of partial |
| /// writes). |
| </span><span class="kw">pub fn </span>write(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>data: <span class="kw-2">&</span>[u8], <span class="kw-2">mut </span>fin: bool) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="kw">let </span>max_off = <span class="self">self</span>.off + data.len() <span class="kw">as </span>u64; |
| |
| <span class="comment">// Get the stream send capacity. This will return an error if the stream |
| // was stopped. |
| </span><span class="kw">let </span>capacity = <span class="self">self</span>.cap()<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>data.len() > capacity { |
| <span class="comment">// Truncate the input buffer according to the stream's capacity. |
| </span><span class="kw">let </span>len = capacity; |
| data = <span class="kw-2">&</span>data[..len]; |
| |
| <span class="comment">// We are not buffering the full input, so clear the fin flag. |
| </span>fin = <span class="bool-val">false</span>; |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fin_off) = <span class="self">self</span>.fin_off { |
| <span class="comment">// Can't write past final offset. |
| </span><span class="kw">if </span>max_off > fin_off { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FinalSize); |
| } |
| |
| <span class="comment">// Can't "undo" final offset. |
| </span><span class="kw">if </span>max_off == fin_off && !fin { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FinalSize); |
| } |
| } |
| |
| <span class="kw">if </span>fin { |
| <span class="self">self</span>.fin_off = <span class="prelude-val">Some</span>(max_off); |
| } |
| |
| <span class="comment">// Don't queue data that was already fully acked. |
| </span><span class="kw">if </span><span class="self">self</span>.ack_off() >= max_off { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(data.len()); |
| } |
| |
| <span class="comment">// We already recorded the final offset, so we can just discard the |
| // empty buffer now. |
| </span><span class="kw">if </span>data.is_empty() { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(data.len()); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>len = <span class="number">0</span>; |
| |
| <span class="comment">// Split the remaining input data into consistently-sized buffers to |
| // avoid fragmentation. |
| </span><span class="kw">for </span>chunk <span class="kw">in </span>data.chunks(SEND_BUFFER_SIZE) { |
| len += chunk.len(); |
| |
| <span class="kw">let </span>fin = len == data.len() && fin; |
| |
| <span class="kw">let </span>buf = RangeBuf::from(chunk, <span class="self">self</span>.off, fin); |
| |
| <span class="comment">// The new data can simply be appended at the end of the send buffer. |
| </span><span class="self">self</span>.data.push_back(buf); |
| |
| <span class="self">self</span>.off += chunk.len() <span class="kw">as </span>u64; |
| <span class="self">self</span>.len += chunk.len() <span class="kw">as </span>u64; |
| } |
| |
| <span class="prelude-val">Ok</span>(len) |
| } |
| |
| <span class="doccomment">/// Writes data from the send buffer into the given output buffer. |
| </span><span class="kw">pub fn </span>emit(<span class="kw-2">&mut </span><span class="self">self</span>, out: <span class="kw-2">&mut </span>[u8]) -> <span class="prelude-ty">Result</span><(usize, bool)> { |
| <span class="kw">let </span><span class="kw-2">mut </span>out_len = out.len(); |
| <span class="kw">let </span>out_off = <span class="self">self</span>.off_front(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>next_off = out_off; |
| |
| <span class="kw">while </span>out_len > <span class="number">0 </span>{ |
| <span class="kw">let </span>off_front = <span class="self">self</span>.off_front(); |
| |
| <span class="kw">if </span><span class="self">self</span>.is_empty() || |
| off_front >= <span class="self">self</span>.off || |
| off_front != next_off || |
| off_front >= <span class="self">self</span>.max_data |
| { |
| <span class="kw">break</span>; |
| } |
| |
| <span class="kw">let </span>buf = <span class="kw">match </span><span class="self">self</span>.data.get_mut(<span class="self">self</span>.pos) { |
| <span class="prelude-val">Some</span>(v) => v, |
| |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| }; |
| |
| <span class="kw">if </span>buf.is_empty() { |
| <span class="self">self</span>.pos += <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="kw">let </span>buf_len = cmp::min(buf.len(), out_len); |
| <span class="kw">let </span>partial = buf_len < buf.len(); |
| |
| <span class="comment">// Copy data to the output buffer. |
| </span><span class="kw">let </span>out_pos = (next_off - out_off) <span class="kw">as </span>usize; |
| out[out_pos..out_pos + buf_len].copy_from_slice(<span class="kw-2">&</span>buf[..buf_len]); |
| |
| <span class="self">self</span>.len -= buf_len <span class="kw">as </span>u64; |
| |
| out_len -= buf_len; |
| |
| next_off = buf.off() + buf_len <span class="kw">as </span>u64; |
| |
| buf.consume(buf_len); |
| |
| <span class="kw">if </span>partial { |
| <span class="comment">// We reached the maximum capacity, so end here. |
| </span><span class="kw">break</span>; |
| } |
| |
| <span class="self">self</span>.pos += <span class="number">1</span>; |
| } |
| |
| <span class="comment">// Override the `fin` flag set for the output buffer by matching the |
| // buffer's maximum offset against the stream's final offset (if known). |
| // |
| // This is more efficient than tracking `fin` using the range buffers |
| // themselves, and lets us avoid queueing empty buffers just so we can |
| // propagate the final size. |
| </span><span class="kw">let </span>fin = <span class="self">self</span>.fin_off == <span class="prelude-val">Some</span>(next_off); |
| |
| <span class="comment">// Record the largest offset that has been sent so we can accurately |
| // report final_size |
| </span><span class="self">self</span>.emit_off = cmp::max(<span class="self">self</span>.emit_off, next_off); |
| |
| <span class="prelude-val">Ok</span>((out.len() - out_len, fin)) |
| } |
| |
| <span class="doccomment">/// Updates the max_data limit to the given value. |
| </span><span class="kw">pub fn </span>update_max_data(<span class="kw-2">&mut </span><span class="self">self</span>, max_data: u64) { |
| <span class="self">self</span>.max_data = cmp::max(<span class="self">self</span>.max_data, max_data); |
| } |
| |
| <span class="doccomment">/// Updates the last offset the stream was blocked at, if any. |
| </span><span class="kw">pub fn </span>update_blocked_at(<span class="kw-2">&mut </span><span class="self">self</span>, blocked_at: <span class="prelude-ty">Option</span><u64>) { |
| <span class="self">self</span>.blocked_at = blocked_at; |
| } |
| |
| <span class="doccomment">/// The last offset the stream was blocked at, if any. |
| </span><span class="kw">pub fn </span>blocked_at(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><u64> { |
| <span class="self">self</span>.blocked_at |
| } |
| |
| <span class="doccomment">/// Increments the acked data offset. |
| </span><span class="kw">pub fn </span>ack(<span class="kw-2">&mut </span><span class="self">self</span>, off: u64, len: usize) { |
| <span class="self">self</span>.acked.insert(off..off + len <span class="kw">as </span>u64); |
| } |
| |
| <span class="kw">pub fn </span>ack_and_drop(<span class="kw-2">&mut </span><span class="self">self</span>, off: u64, len: usize) { |
| <span class="self">self</span>.ack(off, len); |
| |
| <span class="kw">let </span>ack_off = <span class="self">self</span>.ack_off(); |
| |
| <span class="kw">if </span><span class="self">self</span>.data.is_empty() { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>off > ack_off { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>drop_until = <span class="prelude-val">None</span>; |
| |
| <span class="comment">// Drop contiguously acked data from the front of the buffer. |
| </span><span class="kw">for </span>(i, buf) <span class="kw">in </span><span class="self">self</span>.data.iter_mut().enumerate() { |
| <span class="comment">// Newly acked range is past highest contiguous acked range, so we |
| // can't drop it. |
| </span><span class="kw">if </span>buf.off >= ack_off { |
| <span class="kw">break</span>; |
| } |
| |
| <span class="comment">// Highest contiguous acked range falls within newly acked range, |
| // so we can't drop it. |
| </span><span class="kw">if </span>buf.off < ack_off && ack_off < buf.max_off() { |
| <span class="kw">break</span>; |
| } |
| |
| <span class="comment">// Newly acked range can be dropped. |
| </span>drop_until = <span class="prelude-val">Some</span>(i); |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(drop) = drop_until { |
| <span class="self">self</span>.data.drain(..=drop); |
| |
| <span class="comment">// When a buffer is marked for retransmission, but then acked before |
| // it could be retransmitted, we might end up decreasing the SendBuf |
| // position too much, so make sure that doesn't happen. |
| </span><span class="self">self</span>.pos = <span class="self">self</span>.pos.saturating_sub(drop + <span class="number">1</span>); |
| } |
| } |
| |
| <span class="kw">pub fn </span>retransmit(<span class="kw-2">&mut </span><span class="self">self</span>, off: u64, len: usize) { |
| <span class="kw">let </span>max_off = off + len <span class="kw">as </span>u64; |
| <span class="kw">let </span>ack_off = <span class="self">self</span>.ack_off(); |
| |
| <span class="kw">if </span><span class="self">self</span>.data.is_empty() { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">if </span>max_off <= ack_off { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="self">self</span>.data.len() { |
| <span class="kw">let </span>buf = <span class="kw-2">&mut </span><span class="self">self</span>.data[i]; |
| |
| <span class="kw">if </span>buf.off >= max_off { |
| <span class="kw">break</span>; |
| } |
| |
| <span class="kw">if </span>off > buf.max_off() { |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="comment">// Split the buffer into 2 if the retransmit range ends before the |
| // buffer's final offset. |
| </span><span class="kw">let </span>new_buf = <span class="kw">if </span>buf.off < max_off && max_off < buf.max_off() { |
| <span class="prelude-val">Some</span>(buf.split_off((max_off - buf.off) <span class="kw">as </span>usize)) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>}; |
| |
| <span class="kw">let </span>prev_pos = buf.pos; |
| |
| <span class="comment">// Reduce the buffer's position (expand the buffer) if the retransmit |
| // range is past the buffer's starting offset. |
| </span>buf.pos = <span class="kw">if </span>off > buf.off && off <= buf.max_off() { |
| cmp::min(buf.pos, buf.start + (off - buf.off) <span class="kw">as </span>usize) |
| } <span class="kw">else </span>{ |
| buf.start |
| }; |
| |
| <span class="self">self</span>.pos = cmp::min(<span class="self">self</span>.pos, i); |
| |
| <span class="self">self</span>.len += (prev_pos - buf.pos) <span class="kw">as </span>u64; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(b) = new_buf { |
| <span class="self">self</span>.data.insert(i + <span class="number">1</span>, b); |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Resets the stream at the current offset and clears all buffered data. |
| </span><span class="kw">pub fn </span>reset(<span class="kw-2">&mut </span><span class="self">self</span>) -> (u64, u64) { |
| <span class="kw">let </span>unsent_off = cmp::max(<span class="self">self</span>.off_front(), <span class="self">self</span>.emit_off); |
| <span class="kw">let </span>unsent_len = <span class="self">self</span>.off_back().saturating_sub(unsent_off); |
| |
| <span class="self">self</span>.fin_off = <span class="prelude-val">Some</span>(unsent_off); |
| |
| <span class="comment">// Drop all buffered data. |
| </span><span class="self">self</span>.data.clear(); |
| |
| <span class="comment">// Mark relevant data as acked. |
| </span><span class="self">self</span>.off = unsent_off; |
| <span class="self">self</span>.ack(<span class="number">0</span>, <span class="self">self</span>.off <span class="kw">as </span>usize); |
| |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| <span class="self">self</span>.len = <span class="number">0</span>; |
| |
| (<span class="self">self</span>.emit_off, unsent_len) |
| } |
| |
| <span class="doccomment">/// Resets the streams and records the received error code. |
| /// |
| /// Calling this again after the first time has no effect. |
| </span><span class="kw">pub fn </span>stop(<span class="kw-2">&mut </span><span class="self">self</span>, error_code: u64) -> <span class="prelude-ty">Result</span><(u64, u64)> { |
| <span class="kw">if </span><span class="self">self</span>.error.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done); |
| } |
| |
| <span class="kw">let </span>(max_off, unsent) = <span class="self">self</span>.reset(); |
| |
| <span class="self">self</span>.error = <span class="prelude-val">Some</span>(error_code); |
| |
| <span class="prelude-val">Ok</span>((max_off, unsent)) |
| } |
| |
| <span class="doccomment">/// Shuts down sending data. |
| </span><span class="kw">pub fn </span>shutdown(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(u64, u64)> { |
| <span class="kw">if </span><span class="self">self</span>.shutdown { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::Done); |
| } |
| |
| <span class="self">self</span>.shutdown = <span class="bool-val">true</span>; |
| |
| <span class="prelude-val">Ok</span>(<span class="self">self</span>.reset()) |
| } |
| |
| <span class="doccomment">/// Returns the largest offset of data buffered. |
| </span><span class="kw">pub fn </span>off_back(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.off |
| } |
| |
| <span class="doccomment">/// Returns the lowest offset of data buffered. |
| </span><span class="kw">pub fn </span>off_front(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>pos = <span class="self">self</span>.pos; |
| |
| <span class="comment">// Skip empty buffers from the start of the queue. |
| </span><span class="kw">while let </span><span class="prelude-val">Some</span>(b) = <span class="self">self</span>.data.get(pos) { |
| <span class="kw">if </span>!b.is_empty() { |
| <span class="kw">return </span>b.off(); |
| } |
| |
| pos += <span class="number">1</span>; |
| } |
| |
| <span class="self">self</span>.off |
| } |
| |
| <span class="doccomment">/// The maximum offset we are allowed to send to the peer. |
| </span><span class="kw">pub fn </span>max_off(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="self">self</span>.max_data |
| } |
| |
| <span class="doccomment">/// Returns true if all data in the stream has been sent. |
| /// |
| /// This happens when the stream's send final size is known, and the |
| /// application has already written data up to that point. |
| </span><span class="kw">pub fn </span>is_fin(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if </span><span class="self">self</span>.fin_off == <span class="prelude-val">Some</span>(<span class="self">self</span>.off) { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="doccomment">/// Returns true if the send-side of the stream is complete. |
| /// |
| /// This happens when the stream's send final size is known, and the peer |
| /// has already acked all stream data up to that point. |
| </span><span class="kw">pub fn </span>is_complete(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fin_off) = <span class="self">self</span>.fin_off { |
| <span class="kw">if </span><span class="self">self</span>.acked == (<span class="number">0</span>..fin_off) { |
| <span class="kw">return </span><span class="bool-val">true</span>; |
| } |
| } |
| |
| <span class="bool-val">false |
| </span>} |
| |
| <span class="doccomment">/// Returns true if the stream was stopped before completion. |
| </span><span class="kw">pub fn </span>is_stopped(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.error.is_some() |
| } |
| |
| <span class="doccomment">/// Returns true if the stream was shut down. |
| </span><span class="kw">pub fn </span>is_shutdown(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.shutdown |
| } |
| |
| <span class="doccomment">/// Returns true if there is no data. |
| </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.data.is_empty() |
| } |
| |
| <span class="doccomment">/// Returns the highest contiguously acked offset. |
| </span><span class="kw">pub fn </span>ack_off(<span class="kw-2">&</span><span class="self">self</span>) -> u64 { |
| <span class="kw">match </span><span class="self">self</span>.acked.iter().next() { |
| <span class="comment">// Only consider the initial range if it contiguously covers the |
| // start of the stream (i.e. from offset 0). |
| </span><span class="prelude-val">Some</span>(std::ops::Range { start: <span class="number">0</span>, end }) => end, |
| |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) | <span class="prelude-val">None </span>=> <span class="number">0</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Returns the outgoing flow control capacity. |
| </span><span class="kw">pub fn </span>cap(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><usize> { |
| <span class="comment">// The stream was stopped, so return the error code instead. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(e) = <span class="self">self</span>.error { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::StreamStopped(e)); |
| } |
| |
| <span class="prelude-val">Ok</span>((<span class="self">self</span>.max_data - <span class="self">self</span>.off) <span class="kw">as </span>usize) |
| } |
| |
| <span class="doccomment">/// Returns the number of separate buffers stored. |
| </span><span class="attr">#[allow(dead_code)] |
| </span><span class="kw">pub fn </span>bufs_count(<span class="kw-2">&</span><span class="self">self</span>) -> usize { |
| <span class="self">self</span>.data.len() |
| } |
| } |
| |
| <span class="attr">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>empty_write() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">5</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">0</span>); |
| <span class="macro">assert!</span>(!fin); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>multi_write() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">128</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| <span class="kw">let </span>second = <span class="string">b"helloworld"</span>; |
| |
| <span class="macro">assert!</span>(send.write(first, <span class="bool-val">false</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="macro">assert!</span>(send.write(second, <span class="bool-val">true</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">19</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">128</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">19</span>); |
| <span class="macro">assert!</span>(fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"somethinghelloworld"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>split_write() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">10</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| <span class="kw">let </span>second = <span class="string">b"helloworld"</span>; |
| |
| <span class="macro">assert!</span>(send.write(first, <span class="bool-val">false</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="macro">assert!</span>(send.write(second, <span class="bool-val">true</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">19</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">10</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"somethingh"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">10</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">5</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">5</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"ellow"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">4</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">15</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">4</span>); |
| <span class="macro">assert!</span>(fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"orld"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">19</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>resend() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">15</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| <span class="kw">let </span>second = <span class="string">b"helloworld"</span>; |
| |
| <span class="macro">assert!</span>(send.write(first, <span class="bool-val">false</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="macro">assert!</span>(send.write(second, <span class="bool-val">true</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">19</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">4</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">4</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"some"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">15</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">4</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">5</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">5</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"thing"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">10</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">9</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">5</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">5</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"hello"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">14</span>); |
| |
| send.retransmit(<span class="number">4</span>, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">10</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">4</span>); |
| |
| send.retransmit(<span class="number">0</span>, <span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">14</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">11</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">9</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"something"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">14</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">11</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">5</span>); |
| <span class="macro">assert!</span>(fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"world"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">19</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>write_blocked_by_off() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">10</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::default(); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| <span class="kw">let </span>second = <span class="string">b"helloworld"</span>; |
| |
| <span class="macro">assert_eq!</span>(send.write(first, <span class="bool-val">false</span>), <span class="prelude-val">Ok</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(second, <span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| send.update_max_data(<span class="number">5</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(first, <span class="bool-val">false</span>), <span class="prelude-val">Ok</span>(<span class="number">5</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">5</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(second, <span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">5</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">5</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"somet"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">5</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">0</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b""</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| send.update_max_data(<span class="number">15</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(<span class="kw-2">&</span>first[<span class="number">5</span>..], <span class="bool-val">false</span>), <span class="prelude-val">Ok</span>(<span class="number">4</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">4</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(second, <span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(<span class="number">6</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">10</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">5</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">10</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..<span class="number">10</span>], <span class="string">b"hinghellow"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| send.update_max_data(<span class="number">25</span>); |
| |
| <span class="macro">assert_eq!</span>(send.write(<span class="kw-2">&</span>second[<span class="number">6</span>..], <span class="bool-val">true</span>), <span class="prelude-val">Ok</span>(<span class="number">4</span>)); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">4</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">15</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">4</span>); |
| <span class="macro">assert!</span>(fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"orld"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>zero_len_write() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">10</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| |
| <span class="macro">assert!</span>(send.write(first, <span class="bool-val">false</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="macro">assert!</span>(send.write(<span class="kw-2">&</span>[], <span class="bool-val">true</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">10</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">9</span>); |
| <span class="macro">assert!</span>(fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"something"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| } |
| |
| <span class="doccomment">/// Check SendBuf::len calculation on a retransmit case |
| </span><span class="attr">#[test] |
| </span><span class="kw">fn </span>send_buf_len_on_retransmit() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">15</span>]; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="kw">let </span>first = <span class="string">b"something"</span>; |
| |
| <span class="macro">assert!</span>(send.write(first, <span class="bool-val">false</span>).is_ok()); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">9</span>); |
| |
| <span class="kw">let </span>(written, fin) = send.emit(<span class="kw-2">&mut </span>buf[..<span class="number">4</span>]).unwrap(); |
| <span class="macro">assert_eq!</span>(written, <span class="number">4</span>); |
| <span class="macro">assert!</span>(!fin); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buf[..written], <span class="string">b"some"</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">4</span>); |
| |
| send.retransmit(<span class="number">3</span>, <span class="number">5</span>); |
| <span class="macro">assert_eq!</span>(send.len, <span class="number">6</span>); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">3</span>); |
| } |
| |
| <span class="attr">#[test] |
| </span><span class="kw">fn </span>send_buf_final_size_retransmit() { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0</span>; <span class="number">50</span>]; |
| <span class="kw">let </span><span class="kw-2">mut </span>send = SendBuf::new(u64::MAX); |
| |
| send.write(<span class="kw-2">&</span>buf, <span class="bool-val">false</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(send.off_front(), <span class="number">0</span>); |
| |
| <span class="comment">// Emit the whole buffer |
| </span><span class="kw">let </span>(written, _fin) = send.emit(<span class="kw-2">&mut </span>buf).unwrap(); |
| <span class="macro">assert_eq!</span>(written, buf.len()); |
| <span class="macro">assert_eq!</span>(send.off_front(), buf.len() <span class="kw">as </span>u64); |
| |
| <span class="comment">// Server decides to retransmit the last 10 bytes. It's possible |
| // it's not actually lost and that the client did receive it. |
| </span>send.retransmit(<span class="number">40</span>, <span class="number">10</span>); |
| |
| <span class="comment">// Server receives STOP_SENDING from client. The final_size we |
| // send in the RESET_STREAM should be 50. If we send anything less, |
| // it's a FINAL_SIZE_ERROR. |
| </span><span class="kw">let </span>(fin_off, unsent) = send.stop(<span class="number">0</span>).unwrap(); |
| <span class="macro">assert_eq!</span>(fin_off, <span class="number">50</span>); |
| <span class="macro">assert_eq!</span>(unsent, <span class="number">0</span>); |
| } |
| } |
| </code></pre></div></section></main></body></html> |
