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gecko-dev/netwerk/protocol/http/Http2StreamBase.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et tw=80 : */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// HttpLog.h should generally be included first
#include "HttpLog.h"
// Log on level :5, instead of default :4.
#undef LOG
#define LOG(args) LOG5(args)
#undef LOG_ENABLED
#define LOG_ENABLED() LOG5_ENABLED()
#include <algorithm>
#include "Http2Compression.h"
#include "Http2Session.h"
#include "Http2StreamBase.h"
#include "Http2Stream.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/StaticPrefs_network.h"
#include "mozilla/Telemetry.h"
#include "nsAlgorithm.h"
#include "nsHttp.h"
#include "nsHttpHandler.h"
#include "nsHttpRequestHead.h"
#include "nsIClassOfService.h"
#include "prnetdb.h"
namespace mozilla::net {
Http2StreamBase::Http2StreamBase(uint64_t aTransactionBrowserId,
Http2Session* session, int32_t priority,
uint64_t currentBrowserId)
: mSession(
do_GetWeakReference(static_cast<nsISupportsWeakReference*>(session))),
mRequestHeadersDone(0),
mOpenGenerated(0),
mAllHeadersReceived(0),
mQueued(0),
mSocketTransport(session->SocketTransport()),
mCurrentBrowserId(currentBrowserId),
mTransactionBrowserId(aTransactionBrowserId),
mTxInlineFrameSize(Http2Session::kDefaultBufferSize),
mChunkSize(session->SendingChunkSize()),
mRequestBlockedOnRead(0),
mRecvdFin(0),
mReceivedData(0),
mRecvdReset(0),
mSentReset(0),
mCountAsActive(0),
mSentFin(0),
mSentWaitingFor(0),
mSetTCPSocketBuffer(0),
mBypassInputBuffer(0) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
LOG1(("Http2StreamBase::Http2StreamBase %p", this));
mServerReceiveWindow = session->GetServerInitialStreamWindow();
mClientReceiveWindow = session->PushAllowance();
mTxInlineFrame = MakeUnique<uint8_t[]>(mTxInlineFrameSize);
static_assert(nsISupportsPriority::PRIORITY_LOWEST <= kNormalPriority,
"Lowest Priority should be less than kNormalPriority");
// values of priority closer to 0 are higher priority for the priority
// argument. This value is used as a group, which maps to a
// weight that is related to the nsISupportsPriority that we are given.
int32_t httpPriority;
if (priority >= nsISupportsPriority::PRIORITY_LOWEST) {
httpPriority = kWorstPriority;
} else if (priority <= nsISupportsPriority::PRIORITY_HIGHEST) {
httpPriority = kBestPriority;
} else {
httpPriority = kNormalPriority + priority;
}
MOZ_ASSERT(httpPriority >= 0);
SetPriority(static_cast<uint32_t>(httpPriority));
}
Http2StreamBase::~Http2StreamBase() {
MOZ_DIAGNOSTIC_ASSERT(OnSocketThread());
mStreamID = Http2Session::kDeadStreamID;
LOG3(("Http2StreamBase::~Http2StreamBase %p", this));
}
already_AddRefed<Http2Session> Http2StreamBase::Session() {
RefPtr<Http2Session> session = do_QueryReferent(mSession);
return session.forget();
}
// ReadSegments() is used to write data down the socket. Generally, HTTP
// request data is pulled from the approriate transaction and
// converted to HTTP/2 data. Sometimes control data like a window-update is
// generated instead.
nsresult Http2StreamBase::ReadSegments(nsAHttpSegmentReader* reader,
uint32_t count, uint32_t* countRead) {
LOG3(("Http2StreamBase %p ReadSegments reader=%p count=%d state=%x", this,
reader, count, mUpstreamState));
RefPtr<Http2Session> session = Session();
// Reader is nullptr when this is a push stream.
MOZ_DIAGNOSTIC_ASSERT(!reader || (reader == session) ||
(IsTunnel() && NS_FAILED(Condition())));
if (NS_FAILED(Condition())) {
return Condition();
}
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
nsresult rv = NS_ERROR_UNEXPECTED;
mRequestBlockedOnRead = 0;
if (mRecvdFin || mRecvdReset) {
// Don't transmit any request frames if the peer cannot respond
LOG3(
("Http2StreamBase %p ReadSegments request stream aborted due to"
" response side closure\n",
this));
return NS_ERROR_ABORT;
}
// avoid runt chunks if possible by anticipating
// full data frames
if (count > (mChunkSize + 8)) {
uint32_t numchunks = count / (mChunkSize + 8);
count = numchunks * (mChunkSize + 8);
}
switch (mUpstreamState) {
case GENERATING_HEADERS:
case GENERATING_BODY:
case SENDING_BODY:
// Call into the HTTP Transaction to generate the HTTP request
// stream. That stream will show up in OnReadSegment().
mSegmentReader = reader;
rv = CallToReadData(count, countRead);
mSegmentReader = nullptr;
LOG3(("Http2StreamBase::ReadSegments %p trans readsegments rv %" PRIx32
" read=%d\n",
this, static_cast<uint32_t>(rv), *countRead));
// Check to see if the transaction's request could be written out now.
// If not, mark the stream for callback when writing can proceed.
if (NS_SUCCEEDED(rv) && mUpstreamState == GENERATING_HEADERS &&
!mRequestHeadersDone) {
session->TransactionHasDataToWrite(this);
}
// mTxinlineFrameUsed represents any queued un-sent frame. It might
// be 0 if there is no such frame, which is not a gurantee that we
// don't have more request body to send - just that any data that was
// sent comprised a complete HTTP/2 frame. Likewise, a non 0 value is
// a queued, but complete, http/2 frame length.
// Mark that we are blocked on read if the http transaction needs to
// provide more of the request message body and there is nothing queued
// for writing
if (rv == NS_BASE_STREAM_WOULD_BLOCK && !mTxInlineFrameUsed) {
LOG(("Http2StreamBase %p mRequestBlockedOnRead = 1", this));
mRequestBlockedOnRead = 1;
}
// A transaction that had already generated its headers before it was
// queued at the session level (due to concurrency concerns) may not call
// onReadSegment off the ReadSegments() stack above.
// When mTransaction->ReadSegments returns NS_BASE_STREAM_WOULD_BLOCK it
// means it may have already finished providing all the request data
// necessary to generate open, calling OnReadSegment will drive sending
// the request; this may happen after dequeue of the stream.
if (mUpstreamState == GENERATING_HEADERS &&
(NS_SUCCEEDED(rv) || rv == NS_BASE_STREAM_WOULD_BLOCK)) {
LOG3(("Http2StreamBase %p ReadSegments forcing OnReadSegment call\n",
this));
uint32_t wasted = 0;
mSegmentReader = reader;
nsresult rv2 = OnReadSegment("", 0, &wasted);
mSegmentReader = nullptr;
LOG3((" OnReadSegment returned 0x%08" PRIx32,
static_cast<uint32_t>(rv2)));
if (NS_SUCCEEDED(rv2)) {
mRequestBlockedOnRead = 0;
}
}
// If the sending flow control window is open (!mBlockedOnRwin) then
// continue sending the request
if (!mBlockedOnRwin && mOpenGenerated && !mTxInlineFrameUsed &&
NS_SUCCEEDED(rv) && (!*countRead) && CloseSendStreamWhenDone()) {
MOZ_ASSERT(!mQueued);
MOZ_ASSERT(mRequestHeadersDone);
LOG3(
("Http2StreamBase::ReadSegments %p 0x%X: Sending request data "
"complete, "
"mUpstreamState=%x\n",
this, mStreamID, mUpstreamState));
if (mSentFin) {
ChangeState(UPSTREAM_COMPLETE);
} else {
GenerateDataFrameHeader(0, true);
ChangeState(SENDING_FIN_STREAM);
session->TransactionHasDataToWrite(this);
rv = NS_BASE_STREAM_WOULD_BLOCK;
}
}
break;
case SENDING_FIN_STREAM:
// We were trying to send the FIN-STREAM but were blocked from
// sending it out - try again.
if (!mSentFin) {
mSegmentReader = reader;
rv = TransmitFrame(nullptr, nullptr, false);
mSegmentReader = nullptr;
MOZ_ASSERT(NS_FAILED(rv) || !mTxInlineFrameUsed,
"Transmit Frame should be all or nothing");
if (NS_SUCCEEDED(rv)) ChangeState(UPSTREAM_COMPLETE);
} else {
rv = NS_OK;
mTxInlineFrameUsed = 0; // cancel fin data packet
ChangeState(UPSTREAM_COMPLETE);
}
*countRead = 0;
// don't change OK to WOULD BLOCK. we are really done sending if OK
break;
case UPSTREAM_COMPLETE:
*countRead = 0;
rv = NS_OK;
break;
default:
MOZ_ASSERT(false, "Http2StreamBase::ReadSegments unknown state");
break;
}
return rv;
}
uint64_t Http2StreamBase::LocalUnAcked() {
// reduce unacked by the amount of undelivered data
// to help assert flow control
uint64_t undelivered = mSimpleBuffer.Available();
if (undelivered > mLocalUnacked) {
return 0;
}
return mLocalUnacked - undelivered;
}
nsresult Http2StreamBase::BufferInput(uint32_t count, uint32_t* countWritten) {
char buf[SimpleBufferPage::kSimpleBufferPageSize];
if (SimpleBufferPage::kSimpleBufferPageSize < count) {
count = SimpleBufferPage::kSimpleBufferPageSize;
}
mBypassInputBuffer = 1;
nsresult rv = mSegmentWriter->OnWriteSegment(buf, count, countWritten);
mBypassInputBuffer = 0;
if (NS_SUCCEEDED(rv)) {
rv = mSimpleBuffer.Write(buf, *countWritten);
if (NS_FAILED(rv)) {
MOZ_ASSERT(rv == NS_ERROR_OUT_OF_MEMORY);
return NS_ERROR_OUT_OF_MEMORY;
}
}
return rv;
}
bool Http2StreamBase::DeferCleanup(nsresult status) {
// do not cleanup a stream that has data buffered for the transaction
return (NS_SUCCEEDED(status) && mSimpleBuffer.Available());
}
// WriteSegments() is used to read data off the socket. Generally this is
// just a call through to the associated nsHttpTransaction for this stream
// for the remaining data bytes indicated by the current DATA frame.
nsresult Http2StreamBase::WriteSegments(nsAHttpSegmentWriter* writer,
uint32_t count,
uint32_t* countWritten) {
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
MOZ_ASSERT(!mSegmentWriter, "segment writer in progress");
LOG3(("Http2StreamBase::WriteSegments %p count=%d state=%x", this, count,
mUpstreamState));
mSegmentWriter = writer;
nsresult rv = CallToWriteData(count, countWritten);
if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
// consuming transaction won't take data. but we need to read it into a
// buffer so that it won't block other streams. but we should not advance
// the flow control window so that we'll eventually push back on the sender.
rv = BufferInput(count, countWritten);
LOG3(("Http2StreamBase::WriteSegments %p Buffered %" PRIX32 " %d\n", this,
static_cast<uint32_t>(rv), *countWritten));
}
LOG3(("Http2StreamBase::WriteSegments %" PRIX32 "",
static_cast<uint32_t>(rv)));
mSegmentWriter = nullptr;
return rv;
}
nsresult Http2StreamBase::ParseHttpRequestHeaders(const char* buf,
uint32_t avail,
uint32_t* countUsed) {
// Returns NS_OK even if the headers are incomplete
// set mRequestHeadersDone flag if they are complete
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
MOZ_ASSERT(mUpstreamState == GENERATING_HEADERS);
MOZ_ASSERT(!mRequestHeadersDone);
LOG3(("Http2StreamBase::ParseHttpRequestHeaders %p avail=%d state=%x", this,
avail, mUpstreamState));
mFlatHttpRequestHeaders.Append(buf, avail);
// We can use the simple double crlf because firefox is the
// only client we are parsing
int32_t endHeader = mFlatHttpRequestHeaders.Find("\r\n\r\n");
if (endHeader == kNotFound) {
// We don't have all the headers yet
LOG3(
("Http2StreamBase::ParseHttpRequestHeaders %p "
"Need more header bytes. Len = %zd",
this, mFlatHttpRequestHeaders.Length()));
*countUsed = avail;
return NS_OK;
}
// We have recvd all the headers, trim the local
// buffer of the final empty line, and set countUsed to reflect
// the whole header has been consumed.
uint32_t oldLen = mFlatHttpRequestHeaders.Length();
mFlatHttpRequestHeaders.SetLength(endHeader + 2);
*countUsed = avail - (oldLen - endHeader) + 4;
mRequestHeadersDone = 1;
Http2Stream* selfRegularStream = this->GetHttp2Stream();
if (selfRegularStream) {
return selfRegularStream->CheckPushCache();
}
return NS_OK;
}
// This is really a headers frame, but open is pretty clear from a workflow pov
nsresult Http2StreamBase::GenerateOpen() {
// It is now OK to assign a streamID that we are assured will
// be monotonically increasing amongst new streams on this
// session
RefPtr<Http2Session> session = Session();
mStreamID = session->RegisterStreamID(this);
MOZ_ASSERT(mStreamID & 1, "Http2 Stream Channel ID must be odd");
MOZ_ASSERT(!mOpenGenerated);
mOpenGenerated = 1;
LOG3(("Http2StreamBase %p Stream ID 0x%X [session=%p]\n", this, mStreamID,
session.get()));
if (mStreamID >= 0x80000000) {
// streamID must fit in 31 bits. Evading This is theoretically possible
// because stream ID assignment is asynchronous to stream creation
// because of the protocol requirement that the new stream ID
// be monotonically increasing. In reality this is really not possible
// because new streams stop being added to a session with millions of
// IDs still available and no race condition is going to bridge that gap;
// so we can be comfortable on just erroring out for correctness in that
// case.
LOG3(("Stream assigned out of range ID: 0x%X", mStreamID));
return NS_ERROR_UNEXPECTED;
}
// Now we need to convert the flat http headers into a set
// of HTTP/2 headers by writing to mTxInlineFrame{sz}
nsCString compressedData;
uint8_t firstFrameFlags = Http2Session::kFlag_PRIORITY;
nsresult rv = GenerateHeaders(compressedData, firstFrameFlags);
if (NS_FAILED(rv)) {
return rv;
}
if (firstFrameFlags & Http2Session::kFlag_END_STREAM) {
SetSentFin(true);
}
// split this one HEADERS frame up into N HEADERS + CONTINUATION frames if it
// exceeds the 2^14-1 limit for 1 frame. Do it by inserting header size gaps
// in the existing frame for the new headers and for the first one a priority
// field. There is no question this is ugly, but a 16KB HEADERS frame should
// be a long tail event, so this is really just for correctness and a nop in
// the base case.
//
MOZ_ASSERT(!mTxInlineFrameUsed);
uint32_t dataLength = compressedData.Length();
uint32_t maxFrameData =
Http2Session::kMaxFrameData - 5; // 5 bytes for priority
uint32_t numFrames = 1;
if (dataLength > maxFrameData) {
numFrames +=
((dataLength - maxFrameData) + Http2Session::kMaxFrameData - 1) /
Http2Session::kMaxFrameData;
MOZ_ASSERT(numFrames > 1);
}
// note that we could still have 1 frame for 0 bytes of data. that's ok.
uint32_t messageSize = dataLength;
messageSize += Http2Session::kFrameHeaderBytes +
5; // frame header + priority overhead in HEADERS frame
messageSize += (numFrames - 1) *
Http2Session::kFrameHeaderBytes; // frame header overhead in
// CONTINUATION frames
EnsureBuffer(mTxInlineFrame, messageSize, mTxInlineFrameUsed,
mTxInlineFrameSize);
mTxInlineFrameUsed += messageSize;
UpdatePriorityDependency();
LOG1(
("Http2StreamBase %p Generating %d bytes of HEADERS for stream 0x%X with "
"priority weight %u dep 0x%X frames %u\n",
this, mTxInlineFrameUsed, mStreamID, mPriorityWeight,
mPriorityDependency, numFrames));
uint32_t outputOffset = 0;
uint32_t compressedDataOffset = 0;
for (uint32_t idx = 0; idx < numFrames; ++idx) {
uint32_t flags, frameLen;
bool lastFrame = (idx == numFrames - 1);
flags = 0;
frameLen = maxFrameData;
if (!idx) {
flags |= firstFrameFlags;
// Only the first frame needs the 4-byte offset
maxFrameData = Http2Session::kMaxFrameData;
}
if (lastFrame) {
frameLen = dataLength;
flags |= Http2Session::kFlag_END_HEADERS;
}
dataLength -= frameLen;
session->CreateFrameHeader(mTxInlineFrame.get() + outputOffset,
frameLen + (idx ? 0 : 5),
(idx) ? Http2Session::FRAME_TYPE_CONTINUATION
: Http2Session::FRAME_TYPE_HEADERS,
flags, mStreamID);
outputOffset += Http2Session::kFrameHeaderBytes;
if (!idx) {
uint32_t wireDep = PR_htonl(mPriorityDependency);
memcpy(mTxInlineFrame.get() + outputOffset, &wireDep, 4);
memcpy(mTxInlineFrame.get() + outputOffset + 4, &mPriorityWeight, 1);
outputOffset += 5;
}
memcpy(mTxInlineFrame.get() + outputOffset,
compressedData.BeginReading() + compressedDataOffset, frameLen);
compressedDataOffset += frameLen;
outputOffset += frameLen;
}
Telemetry::Accumulate(Telemetry::SPDY_SYN_SIZE, compressedData.Length());
mFlatHttpRequestHeaders.Truncate();
return NS_OK;
}
void Http2StreamBase::AdjustInitialWindow() {
// The default initial_window is sized for pushed streams. When we
// generate a client pulled stream we want to disable flow control for
// the stream with a window update. Do the same for pushed streams
// when they connect to a pull.
uint32_t wireStreamId = GetWireStreamId();
if (wireStreamId == 0) {
return;
}
// right now mClientReceiveWindow is the lower push limit
// bump it up to the pull limit set by the channel or session
// don't allow windows less than push
uint32_t bump = 0;
RefPtr<Http2Session> session = Session();
nsHttpTransaction* trans = HttpTransaction();
if (trans && trans->InitialRwin()) {
bump = (trans->InitialRwin() > mClientReceiveWindow)
? (trans->InitialRwin() - mClientReceiveWindow)
: 0;
} else {
MOZ_ASSERT(session->InitialRwin() >= mClientReceiveWindow);
bump = session->InitialRwin() - mClientReceiveWindow;
}
LOG3(("AdjustInitialwindow increased flow control window %p 0x%X %u\n", this,
wireStreamId, bump));
if (!bump) { // nothing to do
return;
}
EnsureBuffer(mTxInlineFrame,
mTxInlineFrameUsed + Http2Session::kFrameHeaderBytes + 4,
mTxInlineFrameUsed, mTxInlineFrameSize);
uint8_t* packet = mTxInlineFrame.get() + mTxInlineFrameUsed;
mTxInlineFrameUsed += Http2Session::kFrameHeaderBytes + 4;
session->CreateFrameHeader(packet, 4, Http2Session::FRAME_TYPE_WINDOW_UPDATE,
0, wireStreamId);
mClientReceiveWindow += bump;
bump = PR_htonl(bump);
memcpy(packet + Http2Session::kFrameHeaderBytes, &bump, 4);
}
void Http2StreamBase::UpdateTransportReadEvents(uint32_t count) {
mTotalRead += count;
if (!mSocketTransport) {
return;
}
if (Transaction()) {
Transaction()->OnTransportStatus(mSocketTransport,
NS_NET_STATUS_RECEIVING_FROM, mTotalRead);
}
}
void Http2StreamBase::UpdateTransportSendEvents(uint32_t count) {
mTotalSent += count;
// Setting the TCP send buffer, introduced in
// https://bugzilla.mozilla.org/show_bug.cgi?id=790184, which the following
// comment refers to, is being removed once we verify no increases in error
// rate.
//
// normally on non-windows platform we use TCP autotuning for
// the socket buffers, and this works well (managing enough
// buffers for BDP while conserving memory) for HTTP even when
// it creates really deep queues. However this 'buffer bloat' is
// a problem for http/2 because it ruins the low latency properties
// necessary for PING and cancel to work meaningfully.
// If this stream represents a large upload, disable autotuning for
// the session and cap the send buffers by default at 128KB.
// (10Mbit/sec @ 100ms)
//
uint32_t bufferSize = gHttpHandler->SpdySendBufferSize();
if (StaticPrefs::network_http_http2_send_buffer_size() > 0 &&
(mTotalSent > bufferSize) && !mSetTCPSocketBuffer) {
mSetTCPSocketBuffer = 1;
mSocketTransport->SetSendBufferSize(bufferSize);
}
if ((mUpstreamState != SENDING_FIN_STREAM) && Transaction()) {
Transaction()->OnTransportStatus(mSocketTransport, NS_NET_STATUS_SENDING_TO,
mTotalSent);
}
if (!mSentWaitingFor && !mRequestBodyLenRemaining) {
mSentWaitingFor = 1;
if (Transaction()) {
Transaction()->OnTransportStatus(mSocketTransport,
NS_NET_STATUS_WAITING_FOR, 0);
}
}
}
nsresult Http2StreamBase::TransmitFrame(const char* buf, uint32_t* countUsed,
bool forceCommitment) {
// If TransmitFrame returns SUCCESS than all the data is sent (or at least
// buffered at the session level), if it returns WOULD_BLOCK then none of
// the data is sent.
// You can call this function with no data and no out parameter in order to
// flush internal buffers that were previously blocked on writing. You can
// of course feed new data to it as well.
LOG3(("Http2StreamBase::TransmitFrame %p inline=%d stream=%d", this,
mTxInlineFrameUsed, mTxStreamFrameSize));
if (countUsed) *countUsed = 0;
if (!mTxInlineFrameUsed) {
MOZ_ASSERT(!buf);
return NS_OK;
}
MOZ_ASSERT(mTxInlineFrameUsed, "empty stream frame in transmit");
MOZ_ASSERT(mSegmentReader, "TransmitFrame with null mSegmentReader");
MOZ_ASSERT((buf && countUsed) || (!buf && !countUsed),
"TransmitFrame arguments inconsistent");
uint32_t transmittedCount;
nsresult rv;
RefPtr<Http2Session> session = Session();
// In the (relatively common) event that we have a small amount of data
// split between the inlineframe and the streamframe, then move the stream
// data into the inlineframe via copy in order to coalesce into one write.
// Given the interaction with ssl this is worth the small copy cost.
if (mTxStreamFrameSize && mTxInlineFrameUsed &&
mTxStreamFrameSize < Http2Session::kDefaultBufferSize &&
mTxInlineFrameUsed + mTxStreamFrameSize < mTxInlineFrameSize) {
LOG3(("Coalesce Transmit"));
memcpy(&mTxInlineFrame[mTxInlineFrameUsed], buf, mTxStreamFrameSize);
if (countUsed) *countUsed += mTxStreamFrameSize;
mTxInlineFrameUsed += mTxStreamFrameSize;
mTxStreamFrameSize = 0;
}
rv = mSegmentReader->CommitToSegmentSize(
mTxStreamFrameSize + mTxInlineFrameUsed, forceCommitment);
if (rv == NS_BASE_STREAM_WOULD_BLOCK) {
MOZ_ASSERT(!forceCommitment, "forceCommitment with WOULD_BLOCK");
session->TransactionHasDataToWrite(this);
}
if (NS_FAILED(rv)) { // this will include WOULD_BLOCK
return rv;
}
// This function calls mSegmentReader->OnReadSegment to report the actual
// http/2 bytes through to the session object and then the HttpConnection
// which calls the socket write function. It will accept all of the inline and
// stream data because of the above 'commitment' even if it has to buffer
rv = session->BufferOutput(reinterpret_cast<char*>(mTxInlineFrame.get()),
mTxInlineFrameUsed, &transmittedCount);
LOG3(
("Http2StreamBase::TransmitFrame for inline BufferOutput session=%p "
"stream=%p result %" PRIx32 " len=%d",
session.get(), this, static_cast<uint32_t>(rv), transmittedCount));
MOZ_ASSERT(rv != NS_BASE_STREAM_WOULD_BLOCK,
"inconsistent inline commitment result");
if (NS_FAILED(rv)) return rv;
MOZ_ASSERT(transmittedCount == mTxInlineFrameUsed,
"inconsistent inline commitment count");
Http2Session::LogIO(session, this, "Writing from Inline Buffer",
reinterpret_cast<char*>(mTxInlineFrame.get()),
transmittedCount);
if (mTxStreamFrameSize) {
if (!buf) {
// this cannot happen
MOZ_ASSERT(false,
"Stream transmit with null buf argument to "
"TransmitFrame()");
LOG3(("Stream transmit with null buf argument to TransmitFrame()\n"));
return NS_ERROR_UNEXPECTED;
}
// If there is already data buffered, just add to that to form
// a single TLS Application Data Record - otherwise skip the memcpy
if (session->AmountOfOutputBuffered()) {
rv = session->BufferOutput(buf, mTxStreamFrameSize, &transmittedCount);
} else {
rv = session->OnReadSegment(buf, mTxStreamFrameSize, &transmittedCount);
}
LOG3(
("Http2StreamBase::TransmitFrame for regular session=%p "
"stream=%p result %" PRIx32 " len=%d",
session.get(), this, static_cast<uint32_t>(rv), transmittedCount));
MOZ_ASSERT(rv != NS_BASE_STREAM_WOULD_BLOCK,
"inconsistent stream commitment result");
if (NS_FAILED(rv)) return rv;
MOZ_ASSERT(transmittedCount == mTxStreamFrameSize,
"inconsistent stream commitment count");
Http2Session::LogIO(session, this, "Writing from Transaction Buffer", buf,
transmittedCount);
*countUsed += mTxStreamFrameSize;
}
if (!mAttempting0RTT) {
session->FlushOutputQueue();
}
// calling this will trigger waiting_for if mRequestBodyLenRemaining is 0
UpdateTransportSendEvents(mTxInlineFrameUsed + mTxStreamFrameSize);
mTxInlineFrameUsed = 0;
mTxStreamFrameSize = 0;
return NS_OK;
}
void Http2StreamBase::ChangeState(enum upstreamStateType newState) {
LOG3(("Http2StreamBase::ChangeState() %p from %X to %X", this, mUpstreamState,
newState));
mUpstreamState = newState;
}
void Http2StreamBase::GenerateDataFrameHeader(uint32_t dataLength,
bool lastFrame) {
LOG3(("Http2StreamBase::GenerateDataFrameHeader %p len=%d last=%d", this,
dataLength, lastFrame));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
MOZ_ASSERT(!mTxInlineFrameUsed, "inline frame not empty");
MOZ_ASSERT(!mTxStreamFrameSize, "stream frame not empty");
uint8_t frameFlags = 0;
if (lastFrame) {
frameFlags |= Http2Session::kFlag_END_STREAM;
if (dataLength) SetSentFin(true);
}
RefPtr<Http2Session> session = Session();
session->CreateFrameHeader(mTxInlineFrame.get(), dataLength,
Http2Session::FRAME_TYPE_DATA, frameFlags,
mStreamID);
mTxInlineFrameUsed = Http2Session::kFrameHeaderBytes;
mTxStreamFrameSize = dataLength;
}
// ConvertResponseHeaders is used to convert the response headers
// into HTTP/1 format and report some telemetry
nsresult Http2StreamBase::ConvertResponseHeaders(
Http2Decompressor* decompressor, nsACString& aHeadersIn,
nsACString& aHeadersOut, int32_t& httpResponseCode) {
nsresult rv = decompressor->DecodeHeaderBlock(
reinterpret_cast<const uint8_t*>(aHeadersIn.BeginReading()),
aHeadersIn.Length(), aHeadersOut, false);
if (NS_FAILED(rv)) {
LOG3(("Http2StreamBase::ConvertResponseHeaders %p decode Error\n", this));
return rv;
}
nsAutoCString statusString;
decompressor->GetStatus(statusString);
if (statusString.IsEmpty()) {
LOG3(("Http2StreamBase::ConvertResponseHeaders %p Error - no status\n",
this));
return NS_ERROR_ILLEGAL_VALUE;
}
nsresult errcode;
httpResponseCode = statusString.ToInteger(&errcode);
// Ensure the :status is just an HTTP status code
// https://tools.ietf.org/html/rfc7540#section-8.1.2.4
// https://bugzilla.mozilla.org/show_bug.cgi?id=1352146
nsAutoCString parsedStatusString;
parsedStatusString.AppendInt(httpResponseCode);
if (!parsedStatusString.Equals(statusString)) {
LOG3(
("Http2StreamBase::ConvertResposeHeaders %p status %s is not just a "
"code",
this, statusString.BeginReading()));
// Results in stream reset with PROTOCOL_ERROR
return NS_ERROR_ILLEGAL_VALUE;
}
LOG3(("Http2StreamBase::ConvertResponseHeaders %p response code %d\n", this,
httpResponseCode));
if (httpResponseCode == 421) {
// Origin Frame requires 421 to remove this origin from the origin set
RefPtr<Http2Session> session = Session();
session->Received421(ConnectionInfo());
}
if (aHeadersIn.Length() && aHeadersOut.Length()) {
Telemetry::Accumulate(Telemetry::SPDY_SYN_REPLY_SIZE, aHeadersIn.Length());
uint32_t ratio = aHeadersIn.Length() * 100 / aHeadersOut.Length();
Telemetry::Accumulate(Telemetry::SPDY_SYN_REPLY_RATIO, ratio);
}
// The decoding went ok. Now we can customize and clean up.
aHeadersIn.Truncate();
aHeadersOut.AppendLiteral("X-Firefox-Spdy: h2");
aHeadersOut.AppendLiteral("\r\n\r\n");
LOG(("decoded response headers are:\n%s", aHeadersOut.BeginReading()));
HandleResponseHeaders(aHeadersOut, httpResponseCode);
return NS_OK;
}
nsresult Http2StreamBase::ConvertResponseTrailers(
Http2Decompressor* decompressor, nsACString& aTrailersIn) {
LOG3(("Http2StreamBase::ConvertResponseTrailers %p", this));
nsAutoCString flatTrailers;
nsresult rv = decompressor->DecodeHeaderBlock(
reinterpret_cast<const uint8_t*>(aTrailersIn.BeginReading()),
aTrailersIn.Length(), flatTrailers, false);
if (NS_FAILED(rv)) {
LOG3(("Http2StreamBase::ConvertResponseTrailers %p decode Error", this));
return rv;
}
nsHttpTransaction* trans = HttpTransaction();
if (trans) {
trans->SetHttpTrailers(flatTrailers);
} else {
LOG3(("Http2StreamBase::ConvertResponseTrailers %p no trans", this));
}
return NS_OK;
}
void Http2StreamBase::SetResponseIsComplete() {
nsHttpTransaction* trans = HttpTransaction();
if (trans) {
trans->SetResponseIsComplete();
}
}
void Http2StreamBase::SetAllHeadersReceived() {
if (mAllHeadersReceived) {
return;
}
if (mState == RESERVED_BY_REMOTE) {
// pushed streams needs to wait until headers have
// arrived to open up their window
LOG3(
("Http2StreamBase::SetAllHeadersReceived %p state OPEN from reserved\n",
this));
mState = OPEN;
AdjustInitialWindow();
}
mAllHeadersReceived = 1;
}
bool Http2StreamBase::AllowFlowControlledWrite() {
RefPtr<Http2Session> session = Session();
return (session->ServerSessionWindow() > 0) && (mServerReceiveWindow > 0);
}
void Http2StreamBase::UpdateServerReceiveWindow(int32_t delta) {
mServerReceiveWindow += delta;
if (mBlockedOnRwin && AllowFlowControlledWrite()) {
LOG3(
("Http2StreamBase::UpdateServerReceived UnPause %p 0x%X "
"Open stream window\n",
this, mStreamID));
RefPtr<Http2Session> session = Session();
session->TransactionHasDataToWrite(this);
}
}
void Http2StreamBase::SetPriority(uint32_t newPriority) {
int32_t httpPriority = static_cast<int32_t>(newPriority);
if (httpPriority > kWorstPriority) {
httpPriority = kWorstPriority;
} else if (httpPriority < kBestPriority) {
httpPriority = kBestPriority;
}
mRFC7540Priority = static_cast<uint32_t>(httpPriority);
mPriorityWeight = (nsISupportsPriority::PRIORITY_LOWEST + 1) -
(httpPriority - kNormalPriority);
mPriorityDependency = 0; // maybe adjusted later
}
void Http2StreamBase::SetPriorityDependency(uint32_t newPriority,
uint32_t newDependency) {
SetPriority(newPriority);
mPriorityDependency = newDependency;
}
static uint32_t GetPriorityDependencyFromTransaction(nsHttpTransaction* trans) {
MOZ_ASSERT(trans);
uint32_t classFlags = trans->GetClassOfService().Flags();
if (classFlags & nsIClassOfService::UrgentStart) {
return Http2Session::kUrgentStartGroupID;
}
if (classFlags & nsIClassOfService::Leader) {
return Http2Session::kLeaderGroupID;
}
if (classFlags & nsIClassOfService::Follower) {
return Http2Session::kFollowerGroupID;
}
if (classFlags & nsIClassOfService::Speculative) {
return Http2Session::kSpeculativeGroupID;
}
if (classFlags & nsIClassOfService::Background) {
return Http2Session::kBackgroundGroupID;
}
if (classFlags & nsIClassOfService::Unblocked) {
return Http2Session::kOtherGroupID;
}
return Http2Session::kFollowerGroupID; // unmarked followers
}
void Http2StreamBase::UpdatePriorityDependency() {
RefPtr<Http2Session> session = Session();
if (!session->UseH2Deps()) {
return;
}
nsHttpTransaction* trans = HttpTransaction();
if (!trans) {
return;
}
// we create 6 fake dependency streams per session,
// these streams are never opened with HEADERS. our first opened stream is 0xd
// 3 depends 0, weight 200, leader class (kLeaderGroupID)
// 5 depends 0, weight 100, other (kOtherGroupID)
// 7 depends 0, weight 0, background (kBackgroundGroupID)
// 9 depends 7, weight 0, speculative (kSpeculativeGroupID)
// b depends 3, weight 0, follower class (kFollowerGroupID)
// d depends 0, weight 240, urgent-start class (kUrgentStartGroupID)
//
// streams for leaders (html, js, css) depend on 3
// streams for folowers (images) depend on b
// default streams (xhr, async js) depend on 5
// explicit bg streams (beacon, etc..) depend on 7
// spculative bg streams depend on 9
// urgent-start streams depend on d
mPriorityDependency = GetPriorityDependencyFromTransaction(trans);
if (gHttpHandler->ActiveTabPriority() &&
mTransactionBrowserId != mCurrentBrowserId &&
mPriorityDependency != Http2Session::kUrgentStartGroupID) {
LOG3(
("Http2StreamBase::UpdatePriorityDependency %p "
" depends on background group for trans %p\n",
this, trans));
mPriorityDependency = Http2Session::kBackgroundGroupID;
nsHttp::NotifyActiveTabLoadOptimization();
}
LOG1(
("Http2StreamBase::UpdatePriorityDependency %p "
"depends on stream 0x%X\n",
this, mPriorityDependency));
}
void Http2StreamBase::CurrentBrowserIdChanged(uint64_t id) {
if (!mStreamID) {
// For pushed streams, we ignore the direct call from the session and
// instead let it come to the internal function from the pushed stream, so
// we don't accidentally send two PRIORITY frames for the same stream.
return;
}
CurrentBrowserIdChangedInternal(id);
}
void Http2StreamBase::CurrentBrowserIdChangedInternal(uint64_t id) {
MOZ_ASSERT(gHttpHandler->ActiveTabPriority());
RefPtr<Http2Session> session = Session();
LOG3(
("Http2StreamBase::CurrentBrowserIdChangedInternal "
"%p browserId=%" PRIx64 "\n",
this, id));
mCurrentBrowserId = id;
// Urgent start takes an absolute precedence, so don't
// change mPriorityDependency here.
if (mPriorityDependency == Http2Session::kUrgentStartGroupID) {
return;
}
if (session->UseH2Deps()) {
UpdatePriorityRFC7540(session);
} else {
UpdatePriority(session);
}
}
void Http2StreamBase::UpdatePriority(Http2Session* session) {
MOZ_ASSERT(!session->UseH2Deps());
bool isInBackground = mTransactionBrowserId != mCurrentBrowserId;
if (isInBackground) {
LOG3(
("Http2StreamBase::CurrentBrowserIdChangedInternal %p "
"move into background group.\n",
this));
nsHttp::NotifyActiveTabLoadOptimization();
}
nsHttpTransaction* trans = HttpTransaction();
if (!trans) {
return;
}
uint8_t urgency =
nsHttpHandler::UrgencyFromCoSFlags(trans->GetClassOfService().Flags());
bool incremental = trans->GetClassOfService().Incremental();
uint32_t streamID = GetWireStreamId();
// If the tab is in the background
// we can probably lower the priority of this request by 1.
// (to get lower priority we increase urgency).
if (isInBackground && urgency < 6) {
urgency++;
}
if (streamID) {
session->SendPriorityUpdateFrame(streamID, urgency, incremental);
}
}
void Http2StreamBase::UpdatePriorityRFC7540(Http2Session* session) {
MOZ_ASSERT(session->UseH2Deps());
if (mTransactionBrowserId != mCurrentBrowserId) {
mPriorityDependency = Http2Session::kBackgroundGroupID;
LOG3(
("Http2StreamBase::CurrentBrowserIdChangedInternal %p "
"move into background group.\n",
this));
nsHttp::NotifyActiveTabLoadOptimization();
} else {
nsHttpTransaction* trans = HttpTransaction();
if (!trans) {
return;
}
mPriorityDependency = GetPriorityDependencyFromTransaction(trans);
LOG3(
("Http2StreamBase::CurrentBrowserIdChangedInternal %p "
"depends on stream 0x%X\n",
this, mPriorityDependency));
}
uint32_t modifyStreamID = GetWireStreamId();
if (modifyStreamID) {
session->SendPriorityFrame(modifyStreamID, mPriorityDependency,
mPriorityWeight);
}
}
void Http2StreamBase::SetRecvdFin(bool aStatus) {
mRecvdFin = aStatus ? 1 : 0;
if (!aStatus) return;
if (mState == OPEN || mState == RESERVED_BY_REMOTE) {
mState = CLOSED_BY_REMOTE;
} else if (mState == CLOSED_BY_LOCAL) {
mState = CLOSED;
}
}
void Http2StreamBase::SetSentFin(bool aStatus) {
mSentFin = aStatus ? 1 : 0;
if (!aStatus) return;
if (mState == OPEN || mState == RESERVED_BY_REMOTE) {
mState = CLOSED_BY_LOCAL;
} else if (mState == CLOSED_BY_REMOTE) {
mState = CLOSED;
}
}
void Http2StreamBase::SetRecvdReset(bool aStatus) {
mRecvdReset = aStatus ? 1 : 0;
if (!aStatus) return;
mState = CLOSED;
}
void Http2StreamBase::SetSentReset(bool aStatus) {
mSentReset = aStatus ? 1 : 0;
if (!aStatus) return;
mState = CLOSED;
}
//-----------------------------------------------------------------------------
// nsAHttpSegmentReader
//-----------------------------------------------------------------------------
nsresult Http2StreamBase::OnReadSegment(const char* buf, uint32_t count,
uint32_t* countRead) {
LOG3(("Http2StreamBase::OnReadSegment %p count=%d state=%x", this, count,
mUpstreamState));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (!mSegmentReader) {
return NS_BASE_STREAM_WOULD_BLOCK;
}
nsresult rv = NS_ERROR_UNEXPECTED;
uint32_t dataLength;
RefPtr<Http2Session> session = Session();
switch (mUpstreamState) {
case GENERATING_HEADERS:
// The buffer is the HTTP request stream, including at least part of the
// HTTP request header. This state's job is to build a HEADERS frame
// from the header information. count is the number of http bytes
// available (which may include more than the header), and in countRead we
// return the number of those bytes that we consume (i.e. the portion that
// are header bytes)
if (!mRequestHeadersDone) {
if (NS_FAILED(rv = ParseHttpRequestHeaders(buf, count, countRead))) {
return rv;
}
}
if (mRequestHeadersDone && !mOpenGenerated) {
if (!session->TryToActivate(this)) {
LOG3(
("Http2StreamBase::OnReadSegment %p cannot activate now. "
"queued.\n",
this));
return *countRead ? NS_OK : NS_BASE_STREAM_WOULD_BLOCK;
}
if (NS_FAILED(rv = GenerateOpen())) {
return rv;
}
}
LOG3(
("ParseHttpRequestHeaders %p used %d of %d. "
"requestheadersdone = %d mOpenGenerated = %d\n",
this, *countRead, count, mRequestHeadersDone, mOpenGenerated));
if (mOpenGenerated) {
SetHTTPState(OPEN);
AdjustInitialWindow();
// This version of TransmitFrame cannot block
rv = TransmitFrame(nullptr, nullptr, true);
ChangeState(GENERATING_BODY);
break;
}
MOZ_ASSERT(*countRead == count,
"Header parsing not complete but unused data");
break;
case GENERATING_BODY:
// if there is session flow control and either the stream window is active
// and exhaused or the session window is exhausted then suspend
if (!AllowFlowControlledWrite()) {
*countRead = 0;
LOG3(
("Http2StreamBase this=%p, id 0x%X request body suspended because "
"remote window is stream=%" PRId64 " session=%" PRId64 ".\n",
this, mStreamID, mServerReceiveWindow,
session->ServerSessionWindow()));
mBlockedOnRwin = true;
return NS_BASE_STREAM_WOULD_BLOCK;
}
mBlockedOnRwin = false;
// The chunk is the smallest of: availableData, configured chunkSize,
// stream window, session window, or 14 bit framing limit.
// Its amazing we send anything at all.
dataLength = std::min(count, mChunkSize);
if (dataLength > Http2Session::kMaxFrameData) {
dataLength = Http2Session::kMaxFrameData;
}
if (dataLength > session->ServerSessionWindow()) {
dataLength = static_cast<uint32_t>(session->ServerSessionWindow());
}
if (dataLength > mServerReceiveWindow) {
dataLength = static_cast<uint32_t>(mServerReceiveWindow);
}
LOG3(
("Http2StreamBase this=%p id 0x%X send calculation "
"avail=%d chunksize=%d stream window=%" PRId64
" session window=%" PRId64 " "
"max frame=%d USING=%u\n",
this, mStreamID, count, mChunkSize, mServerReceiveWindow,
session->ServerSessionWindow(), Http2Session::kMaxFrameData,
dataLength));
session->DecrementServerSessionWindow(dataLength);
mServerReceiveWindow -= dataLength;
LOG3(("Http2StreamBase %p id 0x%x request len remaining %" PRId64 ", "
"count avail %u, chunk used %u",
this, mStreamID, mRequestBodyLenRemaining, count, dataLength));
if (!dataLength && mRequestBodyLenRemaining) {
return NS_BASE_STREAM_WOULD_BLOCK;
}
if (dataLength > mRequestBodyLenRemaining) {
return NS_ERROR_UNEXPECTED;
}
mRequestBodyLenRemaining -= dataLength;
GenerateDataFrameHeader(dataLength, !mRequestBodyLenRemaining);
ChangeState(SENDING_BODY);
[[fallthrough]];
case SENDING_BODY:
MOZ_ASSERT(mTxInlineFrameUsed, "OnReadSegment Send Data Header 0b");
rv = TransmitFrame(buf, countRead, false);
MOZ_ASSERT(NS_FAILED(rv) || !mTxInlineFrameUsed,
"Transmit Frame should be all or nothing");
LOG3(("TransmitFrame() rv=%" PRIx32 " returning %d data bytes. "
"Header is %d Body is %d.",
static_cast<uint32_t>(rv), *countRead, mTxInlineFrameUsed,
mTxStreamFrameSize));
// normalize a partial write with a WOULD_BLOCK into just a partial write
// as some code will take WOULD_BLOCK to mean an error with nothing
// written (e.g. nsHttpTransaction::ReadRequestSegment()
if (rv == NS_BASE_STREAM_WOULD_BLOCK && *countRead) rv = NS_OK;
// If that frame was all sent, look for another one
if (!mTxInlineFrameUsed) ChangeState(GENERATING_BODY);
break;
case SENDING_FIN_STREAM:
MOZ_ASSERT(false, "resuming partial fin stream out of OnReadSegment");
break;
case UPSTREAM_COMPLETE: {
MOZ_ASSERT(this->GetHttp2Stream() &&
this->GetHttp2Stream()->IsReadingFromPushStream());
rv = TransmitFrame(nullptr, nullptr, true);
break;
}
default:
MOZ_ASSERT(false, "Http2StreamBase::OnReadSegment non-write state");
break;
}
return rv;
}
//-----------------------------------------------------------------------------
// nsAHttpSegmentWriter
//-----------------------------------------------------------------------------
nsresult Http2StreamBase::OnWriteSegment(char* buf, uint32_t count,
uint32_t* countWritten) {
LOG3(("Http2StreamBase::OnWriteSegment %p count=%d state=%x 0x%X\n", this,
count, mUpstreamState, mStreamID));
MOZ_ASSERT(OnSocketThread(), "not on socket thread");
if (!mSegmentWriter) {
return NS_BASE_STREAM_WOULD_BLOCK;
}
// sometimes we have read data from the network and stored it in a pipe
// so that other streams can proceed when the gecko caller is not processing
// data events fast enough and flow control hasn't caught up yet. This
// gets the stored data out of that pipe
if (!mBypassInputBuffer && mSimpleBuffer.Available()) {
*countWritten = mSimpleBuffer.Read(buf, count);
MOZ_ASSERT(*countWritten);
LOG3(
("Http2StreamBase::OnWriteSegment read from flow control buffer %p %x "
"%d\n",
this, mStreamID, *countWritten));
return NS_OK;
}
// read from the network
return mSegmentWriter->OnWriteSegment(buf, count, countWritten);
}
// -----------------------------------------------------------------------------
// mirror nsAHttpTransaction
// -----------------------------------------------------------------------------
bool Http2StreamBase::Do0RTT() {
MOZ_ASSERT(Transaction());
mAttempting0RTT = false;
nsAHttpTransaction* trans = Transaction();
if (trans) {
mAttempting0RTT = trans->Do0RTT();
}
return mAttempting0RTT;
}
nsresult Http2StreamBase::Finish0RTT(bool aRestart, bool aAlpnChanged) {
MOZ_ASSERT(Transaction());
mAttempting0RTT = false;
// Instead of passing (aRestart, aAlpnChanged) here, we use aAlpnChanged for
// both arguments because as long as the alpn token stayed the same, we can
// just reuse what we have in our buffer to send instead of having to have
// the transaction rewind and read it all over again. We only need to rewind
// the transaction if we're switching to a new protocol, because our buffer
// won't get used in that case.
// ..
// however, we send in the aRestart value to indicate that early data failed
// for devtools purposes
nsresult rv = NS_OK;
nsAHttpTransaction* trans = Transaction();
if (trans) {
rv = trans->Finish0RTT(aAlpnChanged, aAlpnChanged);
if (aRestart) {
nsHttpTransaction* hTrans = trans->QueryHttpTransaction();
if (hTrans) {
hTrans->Refused0RTT();
}
}
}
return rv;
}
nsresult Http2StreamBase::GetOriginAttributes(mozilla::OriginAttributes* oa) {
if (!mSocketTransport) {
return NS_ERROR_UNEXPECTED;
}
return mSocketTransport->GetOriginAttributes(oa);
}
nsHttpTransaction* Http2StreamBase::HttpTransaction() {
return (Transaction()) ? Transaction()->QueryHttpTransaction() : nullptr;
}
nsHttpConnectionInfo* Http2StreamBase::ConnectionInfo() {
if (Transaction()) {
return Transaction()->ConnectionInfo();
}
return nullptr;
}
} // namespace mozilla::net
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