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gecko-dev/netwerk/protocol/http/Http2Stream.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 "Http2Stream.h"
#include "Http2Push.h"
#include "TunnelUtils.h"
#include "mozilla/Telemetry.h"
#include "nsAlgorithm.h"
#include "nsHttp.h"
#include "nsHttpHandler.h"
#include "nsHttpRequestHead.h"
#include "nsIClassOfService.h"
#include "nsIPipe.h"
#include "nsISocketTransport.h"
#include "nsStandardURL.h"
#include "prnetdb.h"
#ifdef DEBUG
// defined by the socket transport service while active
extern PRThread *gSocketThread;
#endif
namespace mozilla {
namespace net {
Http2Stream::Http2Stream(nsAHttpTransaction *httpTransaction,
Http2Session *session,
int32_t priority)
: mStreamID(0)
, mSession(session)
, mUpstreamState(GENERATING_HEADERS)
, mState(IDLE)
, mRequestHeadersDone(0)
, mOpenGenerated(0)
, mAllHeadersReceived(0)
, mQueued(0)
, mTransaction(httpTransaction)
, mSocketTransport(session->SocketTransport())
, mSegmentReader(nullptr)
, mSegmentWriter(nullptr)
, mChunkSize(session->SendingChunkSize())
, mRequestBlockedOnRead(0)
, mRecvdFin(0)
, mRecvdReset(0)
, mSentReset(0)
, mCountAsActive(0)
, mSentFin(0)
, mSentWaitingFor(0)
, mSetTCPSocketBuffer(0)
, mBypassInputBuffer(0)
, mTxInlineFrameSize(Http2Session::kDefaultBufferSize)
, mTxInlineFrameUsed(0)
, mTxStreamFrameSize(0)
, mRequestBodyLenRemaining(0)
, mLocalUnacked(0)
, mBlockedOnRwin(false)
, mTotalSent(0)
, mTotalRead(0)
, mPushSource(nullptr)
, mIsTunnel(false)
, mPlainTextTunnel(false)
{
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
LOG3(("Http2Stream::Http2Stream %p", this));
mServerReceiveWindow = session->GetServerInitialStreamWindow();
mClientReceiveWindow = session->PushAllowance();
mTxInlineFrame = new uint8_t[mTxInlineFrameSize];
PR_STATIC_ASSERT(nsISupportsPriority::PRIORITY_LOWEST <= 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));
}
Http2Stream::~Http2Stream()
{
ClearTransactionsBlockedOnTunnel();
mStreamID = Http2Session::kDeadStreamID;
}
// 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
Http2Stream::ReadSegments(nsAHttpSegmentReader *reader,
uint32_t count,
uint32_t *countRead)
{
LOG3(("Http2Stream %p ReadSegments reader=%p count=%d state=%x",
this, reader, count, mUpstreamState));
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
nsresult rv = NS_ERROR_UNEXPECTED;
mRequestBlockedOnRead = 0;
if (mRecvdFin || mRecvdReset) {
// Don't transmit any request frames if the peer cannot respond
LOG3(("Http2Stream %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 = mTransaction->ReadSegments(this, count, countRead);
mSegmentReader = nullptr;
LOG3(("Http2Stream::ReadSegments %p trans readsegments rv %x read=%d\n",
this, 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)
mSession->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)
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.
if (mUpstreamState == GENERATING_HEADERS && NS_SUCCEEDED(rv)) {
LOG3(("Http2Stream %p ReadSegments forcing OnReadSegment call\n", this));
uint32_t wasted = 0;
mSegmentReader = reader;
OnReadSegment("", 0, &wasted);
mSegmentReader = nullptr;
}
// If the sending flow control window is open (!mBlockedOnRwin) then
// continue sending the request
if (!mBlockedOnRwin && mOpenGenerated &&
!mTxInlineFrameUsed && NS_SUCCEEDED(rv) && (!*countRead)) {
MOZ_ASSERT(!mQueued);
MOZ_ASSERT(mRequestHeadersDone);
LOG3(("Http2Stream::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);
mSession->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, "Http2Stream::ReadSegments unknown state");
break;
}
return rv;
}
static bool
IsDataAvailable(nsIInputStream *stream)
{
if (!stream) {
return false;
}
uint64_t avail;
if (NS_FAILED(stream->Available(&avail))) {
return false;
}
return (avail > 0);
}
uint64_t
Http2Stream::LocalUnAcked()
{
// reduce unacked by the amount of undelivered data
// to help assert flow control
uint64_t undelivered = 0;
if (mInputBufferIn) {
mInputBufferIn->Available(&undelivered);
}
if (undelivered > mLocalUnacked) {
return 0;
}
return mLocalUnacked - undelivered;
}
nsresult
Http2Stream::BufferInput(uint32_t count, uint32_t *countWritten)
{
static const uint32_t segmentSize = 32768;
char buf[segmentSize];
count = std::min(segmentSize, count);
if (!mInputBufferOut) {
NS_NewPipe(getter_AddRefs(mInputBufferIn), getter_AddRefs(mInputBufferOut),
segmentSize, UINT32_MAX);
if (!mInputBufferOut) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
mBypassInputBuffer = 1;
nsresult rv = mSegmentWriter->OnWriteSegment(buf, count, countWritten);
mBypassInputBuffer = 0;
if (NS_SUCCEEDED(rv)) {
uint32_t buffered;
rv = mInputBufferOut->Write(buf, *countWritten, &buffered);
if (NS_SUCCEEDED(rv) && (buffered != *countWritten)) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
return rv;
}
bool
Http2Stream::DeferCleanup(nsresult status)
{
// do not cleanup a stream that has data buffered for the transaction
return (NS_SUCCEEDED(status) && IsDataAvailable(mInputBufferIn));
}
// 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
Http2Stream::WriteSegments(nsAHttpSegmentWriter *writer,
uint32_t count,
uint32_t *countWritten)
{
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
MOZ_ASSERT(!mSegmentWriter, "segment writer in progress");
LOG3(("Http2Stream::WriteSegments %p count=%d state=%x",
this, count, mUpstreamState));
mSegmentWriter = writer;
nsresult rv = mTransaction->WriteSegments(this, 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.
// with tunnels you need to make sure that this is an underlying connction established
// that can be meaningfully giving this signal
bool doBuffer = true;
if (mIsTunnel) {
RefPtr<SpdyConnectTransaction> qiTrans(mTransaction->QuerySpdyConnectTransaction());
if (qiTrans) {
doBuffer = qiTrans->ConnectedReadyForInput();
}
}
// stash this data
if (doBuffer) {
rv = BufferInput(count, countWritten);
LOG3(("Http2Stream::WriteSegments %p Buffered %X %d\n", this, rv, *countWritten));
}
}
mSegmentWriter = nullptr;
return rv;
}
nsresult
Http2Stream::MakeOriginURL(const nsACString &origin, RefPtr<nsStandardURL> &url)
{
nsAutoCString scheme;
nsresult rv = net_ExtractURLScheme(origin, nullptr, nullptr, &scheme);
NS_ENSURE_SUCCESS(rv, rv);
return MakeOriginURL(scheme, origin, url);
}
nsresult
Http2Stream::MakeOriginURL(const nsACString &scheme, const nsACString &origin,
RefPtr<nsStandardURL> &url)
{
url = new nsStandardURL();
nsresult rv = url->Init(nsIStandardURL::URLTYPE_AUTHORITY,
scheme.EqualsLiteral("http") ?
NS_HTTP_DEFAULT_PORT :
NS_HTTPS_DEFAULT_PORT,
origin, nullptr, nullptr);
return rv;
}
void
Http2Stream::CreatePushHashKey(const nsCString &scheme,
const nsCString &hostHeader,
uint64_t serial,
const nsCSubstring &pathInfo,
nsCString &outOrigin,
nsCString &outKey)
{
nsCString fullOrigin = scheme;
fullOrigin.AppendLiteral("://");
fullOrigin.Append(hostHeader);
RefPtr<nsStandardURL> origin;
nsresult rv = Http2Stream::MakeOriginURL(scheme, fullOrigin, origin);
if (NS_SUCCEEDED(rv)) {
rv = origin->GetAsciiSpec(outOrigin);
outOrigin.Trim("/", false, true, false);
}
if (NS_FAILED(rv)) {
// Fallback to plain text copy - this may end up behaving poorly
outOrigin = fullOrigin;
}
outKey = outOrigin;
outKey.AppendLiteral("/[http2.");
outKey.AppendInt(serial);
outKey.Append(']');
outKey.Append(pathInfo);
}
nsresult
Http2Stream::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(PR_GetCurrentThread() == gSocketThread);
MOZ_ASSERT(mUpstreamState == GENERATING_HEADERS);
MOZ_ASSERT(!mRequestHeadersDone);
LOG3(("Http2Stream::ParseHttpRequestHeaders %p avail=%d state=%x",
this, avail, mUpstreamState));
mFlatHttpRequestHeaders.Append(buf, avail);
const nsHttpRequestHead *head = mTransaction->RequestHead();
// 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(("Http2Stream::ParseHttpRequestHeaders %p "
"Need more header bytes. Len = %d",
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;
nsAutoCString authorityHeader;
nsAutoCString hashkey;
head->GetHeader(nsHttp::Host, authorityHeader);
CreatePushHashKey(nsDependentCString(head->IsHTTPS() ? "https" : "http"),
authorityHeader, mSession->Serial(),
head->RequestURI(),
mOrigin, hashkey);
// check the push cache for GET
if (head->IsGet()) {
// from :scheme, :authority, :path
nsISchedulingContext *schedulingContext = mTransaction->SchedulingContext();
SpdyPushCache *cache = nullptr;
if (schedulingContext) {
schedulingContext->GetSpdyPushCache(&cache);
}
Http2PushedStream *pushedStream = nullptr;
// If a push stream is attached to the transaction via onPush, match only with that
// one. This occurs when a push was made with in conjunction with a nsIHttpPushListener
nsHttpTransaction *trans = mTransaction->QueryHttpTransaction();
if (trans && (pushedStream = trans->TakePushedStream())) {
if (pushedStream->mSession == mSession) {
LOG3(("Pushed Stream match based on OnPush correlation %p", pushedStream));
} else {
LOG3(("Pushed Stream match failed due to stream mismatch %p %d %d\n", pushedStream,
pushedStream->mSession->Serial(), mSession->Serial()));
pushedStream->OnPushFailed();
pushedStream = nullptr;
}
}
// we remove the pushedstream from the push cache so that
// it will not be used for another GET. This does not destroy the
// stream itself - that is done when the transactionhash is done with it.
if (cache && !pushedStream){
pushedStream = cache->RemovePushedStreamHttp2(hashkey);
}
LOG3(("Pushed Stream Lookup "
"session=%p key=%s schedulingcontext=%p cache=%p hit=%p\n",
mSession, hashkey.get(), schedulingContext, cache, pushedStream));
if (pushedStream) {
LOG3(("Pushed Stream Match located id=0x%X key=%s\n",
pushedStream->StreamID(), hashkey.get()));
pushedStream->SetConsumerStream(this);
mPushSource = pushedStream;
SetSentFin(true);
AdjustPushedPriority();
// There is probably pushed data buffered so trigger a read manually
// as we can't rely on future network events to do it
mSession->ConnectPushedStream(this);
mOpenGenerated = 1;
return NS_OK;
}
}
return NS_OK;
}
// This is really a headers frame, but open is pretty clear from a workflow pov
nsresult
Http2Stream::GenerateOpen()
{
// It is now OK to assign a streamID that we are assured will
// be monotonically increasing amongst new streams on this
// session
mStreamID = mSession->RegisterStreamID(this);
MOZ_ASSERT(mStreamID & 1, "Http2 Stream Channel ID must be odd");
MOZ_ASSERT(!mOpenGenerated);
mOpenGenerated = 1;
const nsHttpRequestHead *head = mTransaction->RequestHead();
LOG3(("Http2Stream %p Stream ID 0x%X [session=%p] for URI %s\n",
this, mStreamID, mSession, nsCString(head->RequestURI()).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;
nsAutoCString authorityHeader;
head->GetHeader(nsHttp::Host, authorityHeader);
nsDependentCString scheme(head->IsHTTPS() ? "https" : "http");
if (head->IsConnect()) {
MOZ_ASSERT(mTransaction->QuerySpdyConnectTransaction());
mIsTunnel = true;
mRequestBodyLenRemaining = 0x0fffffffffffffffULL;
// Our normal authority has an implicit port, best to use an
// explicit one with a tunnel
nsHttpConnectionInfo *ci = mTransaction->ConnectionInfo();
if (!ci) {
return NS_ERROR_UNEXPECTED;
}
authorityHeader = ci->GetOrigin();
authorityHeader.Append(':');
authorityHeader.AppendInt(ci->OriginPort());
}
mSession->Compressor()->EncodeHeaderBlock(mFlatHttpRequestHeaders,
head->Method(),
head->Path(),
authorityHeader,
scheme,
head->IsConnect(),
compressedData);
int64_t clVal = mSession->Compressor()->GetParsedContentLength();
if (clVal != -1) {
mRequestBodyLenRemaining = clVal;
}
// Determine whether to put the fin bit on the header frame or whether
// to wait for a data packet to put it on.
uint8_t firstFrameFlags = Http2Session::kFlag_PRIORITY;
if (head->IsGet() ||
head->IsHead()) {
// for GET and HEAD place the fin bit right on the
// header packet
SetSentFin(true);
firstFrameFlags |= Http2Session::kFlag_END_STREAM;
} else if (head->IsPost() ||
head->IsPut() ||
head->IsConnect() ||
head->IsOptions()) {
// place fin in a data frame even for 0 length messages for iterop
} else if (!mRequestBodyLenRemaining) {
// for other HTTP extension methods, rely on the content-length
// to determine whether or not to put fin on headers
SetSentFin(true);
firstFrameFlags |= Http2Session::kFlag_END_STREAM;
}
// 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();
LOG3(("Http2Stream %p Generating %d bytes of HEADERS for stream 0x%X with "
"priority weight %u dep 0x%X frames %u uri=%s\n",
this, mTxInlineFrameUsed, mStreamID, mPriorityWeight,
mPriorityDependency, numFrames, nsCString(head->RequestURI()).get()));
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;
mSession->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());
// The size of the input headers is approximate
uint32_t ratio =
compressedData.Length() * 100 /
(11 + head->RequestURI().Length() +
mFlatHttpRequestHeaders.Length());
mFlatHttpRequestHeaders.Truncate();
Telemetry::Accumulate(Telemetry::SPDY_SYN_RATIO, ratio);
return NS_OK;
}
void
Http2Stream::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.
// >0 even numbered IDs are pushed streams.
// odd numbered IDs are pulled streams.
// 0 is the sink for a pushed stream.
Http2Stream *stream = this;
if (!mStreamID) {
MOZ_ASSERT(mPushSource);
if (!mPushSource)
return;
stream = mPushSource;
MOZ_ASSERT(stream->mStreamID);
MOZ_ASSERT(!(stream->mStreamID & 1)); // is a push stream
// If the pushed stream has recvd a FIN, there is no reason to update
// the window
if (stream->RecvdFin() || stream->RecvdReset())
return;
}
if (stream->mState == RESERVED_BY_REMOTE) {
// h2-14 prevents sending a window update in this state
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;
nsHttpTransaction *trans = mTransaction->QueryHttpTransaction();
if (trans && trans->InitialRwin()) {
bump = (trans->InitialRwin() > mClientReceiveWindow) ?
(trans->InitialRwin() - mClientReceiveWindow) : 0;
} else {
MOZ_ASSERT(mSession->InitialRwin() >= mClientReceiveWindow);
bump = mSession->InitialRwin() - mClientReceiveWindow;
}
LOG3(("AdjustInitialwindow increased flow control window %p 0x%X %u\n",
this, stream->mStreamID, 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;
mSession->CreateFrameHeader(packet, 4,
Http2Session::FRAME_TYPE_WINDOW_UPDATE,
0, stream->mStreamID);
mClientReceiveWindow += bump;
bump = PR_htonl(bump);
memcpy(packet + Http2Session::kFrameHeaderBytes, &bump, 4);
}
void
Http2Stream::AdjustPushedPriority()
{
// >0 even numbered IDs are pushed streams. odd numbered IDs are pulled streams.
// 0 is the sink for a pushed stream.
if (mStreamID || !mPushSource)
return;
MOZ_ASSERT(mPushSource->mStreamID && !(mPushSource->mStreamID & 1));
// If the pushed stream has recvd a FIN, there is no reason to update
// the window
if (mPushSource->RecvdFin() || mPushSource->RecvdReset())
return;
EnsureBuffer(mTxInlineFrame, mTxInlineFrameUsed + Http2Session::kFrameHeaderBytes + 5,
mTxInlineFrameUsed, mTxInlineFrameSize);
uint8_t *packet = mTxInlineFrame.get() + mTxInlineFrameUsed;
mTxInlineFrameUsed += Http2Session::kFrameHeaderBytes + 5;
mSession->CreateFrameHeader(packet, 5,
Http2Session::FRAME_TYPE_PRIORITY,
Http2Session::kFlag_PRIORITY,
mPushSource->mStreamID);
mPushSource->SetPriority(mPriority);
memset(packet + Http2Session::kFrameHeaderBytes, 0, 4);
memcpy(packet + Http2Session::kFrameHeaderBytes + 4, &mPriorityWeight, 1);
LOG3(("AdjustPushedPriority %p id 0x%X to weight %X\n", this, mPushSource->mStreamID,
mPriorityWeight));
}
void
Http2Stream::UpdateTransportReadEvents(uint32_t count)
{
mTotalRead += count;
if (!mSocketTransport) {
return;
}
mTransaction->OnTransportStatus(mSocketTransport,
NS_NET_STATUS_RECEIVING_FROM,
mTotalRead);
}
void
Http2Stream::UpdateTransportSendEvents(uint32_t count)
{
mTotalSent += count;
// 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 ((mTotalSent > bufferSize) && !mSetTCPSocketBuffer) {
mSetTCPSocketBuffer = 1;
mSocketTransport->SetSendBufferSize(bufferSize);
}
if (mUpstreamState != SENDING_FIN_STREAM)
mTransaction->OnTransportStatus(mSocketTransport,
NS_NET_STATUS_SENDING_TO,
mTotalSent);
if (!mSentWaitingFor && !mRequestBodyLenRemaining) {
mSentWaitingFor = 1;
mTransaction->OnTransportStatus(mSocketTransport,
NS_NET_STATUS_WAITING_FOR,
0);
}
}
nsresult
Http2Stream::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(("Http2Stream::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;
// 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");
mSession->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 = mSession->BufferOutput(reinterpret_cast<char*>(mTxInlineFrame.get()),
mTxInlineFrameUsed,
&transmittedCount);
LOG3(("Http2Stream::TransmitFrame for inline BufferOutput session=%p "
"stream=%p result %x len=%d",
mSession, this, 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(mSession, 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 (mSession->AmountOfOutputBuffered()) {
rv = mSession->BufferOutput(buf, mTxStreamFrameSize,
&transmittedCount);
} else {
rv = mSession->OnReadSegment(buf, mTxStreamFrameSize,
&transmittedCount);
}
LOG3(("Http2Stream::TransmitFrame for regular session=%p "
"stream=%p result %x len=%d",
mSession, this, 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(mSession, this, "Writing from Transaction Buffer",
buf, transmittedCount);
*countUsed += mTxStreamFrameSize;
}
mSession->FlushOutputQueue();
// calling this will trigger waiting_for if mRequestBodyLenRemaining is 0
UpdateTransportSendEvents(mTxInlineFrameUsed + mTxStreamFrameSize);
mTxInlineFrameUsed = 0;
mTxStreamFrameSize = 0;
return NS_OK;
}
void
Http2Stream::ChangeState(enum upstreamStateType newState)
{
LOG3(("Http2Stream::ChangeState() %p from %X to %X",
this, mUpstreamState, newState));
mUpstreamState = newState;
}
void
Http2Stream::GenerateDataFrameHeader(uint32_t dataLength, bool lastFrame)
{
LOG3(("Http2Stream::GenerateDataFrameHeader %p len=%d last=%d",
this, dataLength, lastFrame));
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
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);
}
mSession->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
Http2Stream::ConvertResponseHeaders(Http2Decompressor *decompressor,
nsACString &aHeadersIn,
nsACString &aHeadersOut,
int32_t &httpResponseCode)
{
aHeadersOut.Truncate();
aHeadersOut.SetCapacity(aHeadersIn.Length() + 512);
nsresult rv =
decompressor->DecodeHeaderBlock(reinterpret_cast<const uint8_t *>(aHeadersIn.BeginReading()),
aHeadersIn.Length(),
aHeadersOut, false);
if (NS_FAILED(rv)) {
LOG3(("Http2Stream::ConvertResponseHeaders %p decode Error\n", this));
return rv;
}
nsAutoCString statusString;
decompressor->GetStatus(statusString);
if (statusString.IsEmpty()) {
LOG3(("Http2Stream::ConvertResponseHeaders %p Error - no status\n", this));
return NS_ERROR_ILLEGAL_VALUE;
}
nsresult errcode;
httpResponseCode = statusString.ToInteger(&errcode);
if (mIsTunnel) {
LOG3(("Http2Stream %p Tunnel Response code %d", this, httpResponseCode));
if ((httpResponseCode / 100) != 2) {
MapStreamToPlainText();
}
}
if (httpResponseCode == 101) {
// 8.1.1 of h2 disallows 101.. throw PROTOCOL_ERROR on stream
LOG3(("Http2Stream::ConvertResponseHeaders %p Error - status == 101\n", this));
return NS_ERROR_ILLEGAL_VALUE;
}
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.Append("X-Firefox-Spdy: h2");
aHeadersOut.Append("\r\n\r\n");
LOG (("decoded response headers are:\n%s", aHeadersOut.BeginReading()));
if (mIsTunnel && !mPlainTextTunnel) {
aHeadersOut.Truncate();
LOG(("Http2Stream::ConvertHeaders %p 0x%X headers removed for tunnel\n",
this, mStreamID));
}
return NS_OK;
}
// ConvertPushHeaders is used to convert the pushed request headers
// into HTTP/1 format and report some telemetry
nsresult
Http2Stream::ConvertPushHeaders(Http2Decompressor *decompressor,
nsACString &aHeadersIn,
nsACString &aHeadersOut)
{
aHeadersOut.Truncate();
aHeadersOut.SetCapacity(aHeadersIn.Length() + 512);
nsresult rv =
decompressor->DecodeHeaderBlock(reinterpret_cast<const uint8_t *>(aHeadersIn.BeginReading()),
aHeadersIn.Length(),
aHeadersOut, true);
if (NS_FAILED(rv)) {
LOG3(("Http2Stream::ConvertPushHeaders %p Error\n", this));
return rv;
}
nsCString method;
decompressor->GetHost(mHeaderHost);
decompressor->GetScheme(mHeaderScheme);
decompressor->GetPath(mHeaderPath);
if (mHeaderHost.IsEmpty() || mHeaderScheme.IsEmpty() || mHeaderPath.IsEmpty()) {
LOG3(("Http2Stream::ConvertPushHeaders %p Error - missing required "
"host=%s scheme=%s path=%s\n", this, mHeaderHost.get(), mHeaderScheme.get(),
mHeaderPath.get()));
return NS_ERROR_ILLEGAL_VALUE;
}
decompressor->GetMethod(method);
if (!method.EqualsLiteral("GET")) {
LOG3(("Http2Stream::ConvertPushHeaders %p Error - method not supported: %s\n",
this, method.get()));
return NS_ERROR_NOT_IMPLEMENTED;
}
aHeadersIn.Truncate();
LOG (("decoded push headers are:\n%s", aHeadersOut.BeginReading()));
return NS_OK;
}
void
Http2Stream::Close(nsresult reason)
{
mTransaction->Close(reason);
}
void
Http2Stream::SetAllHeadersReceived()
{
if (mAllHeadersReceived) {
return;
}
if (mState == RESERVED_BY_REMOTE) {
// pushed streams needs to wait until headers have
// arrived to open up their window
LOG3(("Http2Stream::SetAllHeadersReceived %p state OPEN from reserved\n", this));
mState = OPEN;
AdjustInitialWindow();
}
mAllHeadersReceived = 1;
if (mIsTunnel) {
MapStreamToHttpConnection();
ClearTransactionsBlockedOnTunnel();
}
return;
}
bool
Http2Stream::AllowFlowControlledWrite()
{
return (mSession->ServerSessionWindow() > 0) && (mServerReceiveWindow > 0);
}
void
Http2Stream::UpdateServerReceiveWindow(int32_t delta)
{
mServerReceiveWindow += delta;
if (mBlockedOnRwin && AllowFlowControlledWrite()) {
LOG3(("Http2Stream::UpdateServerReceived UnPause %p 0x%X "
"Open stream window\n", this, mStreamID));
mSession->TransactionHasDataToWrite(this); }
}
void
Http2Stream::SetPriority(uint32_t newPriority)
{
int32_t httpPriority = static_cast<int32_t>(newPriority);
if (httpPriority > kWorstPriority) {
httpPriority = kWorstPriority;
} else if (httpPriority < kBestPriority) {
httpPriority = kBestPriority;
}
mPriority = static_cast<uint32_t>(httpPriority);
mPriorityWeight = (nsISupportsPriority::PRIORITY_LOWEST + 1) -
(httpPriority - kNormalPriority);
mPriorityDependency = 0; // maybe adjusted later
}
void
Http2Stream::SetPriorityDependency(uint32_t newDependency, uint8_t newWeight,
bool exclusive)
{
// undefined what it means when the server sends a priority frame. ignore it.
LOG3(("Http2Stream::SetPriorityDependency %p 0x%X received dependency=0x%X "
"weight=%u exclusive=%d", this, mStreamID, newDependency, newWeight,
exclusive));
}
void
Http2Stream::UpdatePriorityDependency()
{
if (!mSession->UseH2Deps()) {
return;
}
nsHttpTransaction *trans = mTransaction->QueryHttpTransaction();
if (!trans) {
return;
}
// we create 5 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)
//
// 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
uint32_t classFlags = trans->ClassOfService();
if (classFlags & nsIClassOfService::Leader) {
mPriorityDependency = Http2Session::kLeaderGroupID;
} else if (classFlags & nsIClassOfService::Follower) {
mPriorityDependency = Http2Session::kFollowerGroupID;
} else if (classFlags & nsIClassOfService::Speculative) {
mPriorityDependency = Http2Session::kSpeculativeGroupID;
} else if (classFlags & nsIClassOfService::Background) {
mPriorityDependency = Http2Session::kBackgroundGroupID;
} else if (classFlags & nsIClassOfService::Unblocked) {
mPriorityDependency = Http2Session::kOtherGroupID;
} else {
mPriorityDependency = Http2Session::kFollowerGroupID; // unmarked followers
}
LOG3(("Http2Stream::UpdatePriorityDependency %p "
"classFlags %X depends on stream 0x%X\n",
this, classFlags, mPriorityDependency));
}
void
Http2Stream::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
Http2Stream::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
Http2Stream::SetRecvdReset(bool aStatus)
{
mRecvdReset = aStatus ? 1 : 0;
if (!aStatus)
return;
mState = CLOSED;
}
void
Http2Stream::SetSentReset(bool aStatus)
{
mSentReset = aStatus ? 1 : 0;
if (!aStatus)
return;
mState = CLOSED;
}
//-----------------------------------------------------------------------------
// nsAHttpSegmentReader
//-----------------------------------------------------------------------------
nsresult
Http2Stream::OnReadSegment(const char *buf,
uint32_t count,
uint32_t *countRead)
{
LOG3(("Http2Stream::OnReadSegment %p count=%d state=%x",
this, count, mUpstreamState));
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
MOZ_ASSERT(mSegmentReader, "OnReadSegment with null mSegmentReader");
nsresult rv = NS_ERROR_UNEXPECTED;
uint32_t dataLength;
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 (!mSession->TryToActivate(this)) {
LOG3(("Http2Stream::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(("Http2Stream this=%p, id 0x%X request body suspended because "
"remote window is stream=%ld session=%ld.\n", this, mStreamID,
mServerReceiveWindow, mSession->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 > mSession->ServerSessionWindow())
dataLength = static_cast<uint32_t>(mSession->ServerSessionWindow());
if (dataLength > mServerReceiveWindow)
dataLength = static_cast<uint32_t>(mServerReceiveWindow);
LOG3(("Http2Stream this=%p id 0x%X send calculation "
"avail=%d chunksize=%d stream window=%d session window=%d "
"max frame=%d USING=%d\n", this, mStreamID,
count, mChunkSize, mServerReceiveWindow, mSession->ServerSessionWindow(),
Http2Session::kMaxFrameData, dataLength));
mSession->DecrementServerSessionWindow(dataLength);
mServerReceiveWindow -= dataLength;
LOG3(("Http2Stream %p id %x request len remaining %u, "
"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);
// NO BREAK
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=%x returning %d data bytes. "
"Header is %d Body is %d.",
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;
default:
MOZ_ASSERT(false, "Http2Stream::OnReadSegment non-write state");
break;
}
return rv;
}
//-----------------------------------------------------------------------------
// nsAHttpSegmentWriter
//-----------------------------------------------------------------------------
nsresult
Http2Stream::OnWriteSegment(char *buf,
uint32_t count,
uint32_t *countWritten)
{
LOG3(("Http2Stream::OnWriteSegment %p count=%d state=%x 0x%X\n",
this, count, mUpstreamState, mStreamID));
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
MOZ_ASSERT(mSegmentWriter);
if (mPushSource) {
nsresult rv;
rv = mPushSource->GetBufferedData(buf, count, countWritten);
if (NS_FAILED(rv))
return rv;
mSession->ConnectPushedStream(this);
return NS_OK;
}
// 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 && IsDataAvailable(mInputBufferIn)) {
nsresult rv = mInputBufferIn->Read(buf, count, countWritten);
LOG3(("Http2Stream::OnWriteSegment read from flow control buffer %p %x %d\n",
this, mStreamID, *countWritten));
if (!IsDataAvailable(mInputBufferIn)) {
// drop the pipe if we don't need it anymore
mInputBufferIn = nullptr;
mInputBufferOut = nullptr;
}
return rv;
}
// read from the network
return mSegmentWriter->OnWriteSegment(buf, count, countWritten);
}
/// connect tunnels
void
Http2Stream::ClearTransactionsBlockedOnTunnel()
{
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
if (!mIsTunnel) {
return;
}
gHttpHandler->ConnMgr()->ProcessPendingQ(mTransaction->ConnectionInfo());
}
void
Http2Stream::MapStreamToPlainText()
{
RefPtr<SpdyConnectTransaction> qiTrans(mTransaction->QuerySpdyConnectTransaction());
MOZ_ASSERT(qiTrans);
mPlainTextTunnel = true;
qiTrans->ForcePlainText();
}
void
Http2Stream::MapStreamToHttpConnection()
{
RefPtr<SpdyConnectTransaction> qiTrans(mTransaction->QuerySpdyConnectTransaction());
MOZ_ASSERT(qiTrans);
qiTrans->MapStreamToHttpConnection(mSocketTransport,
mTransaction->ConnectionInfo());
}
} // namespace net
} // namespace mozilla
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