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Diffstat (limited to 'netwerk/protocol/http/Http2Stream.cpp')
| -rw-r--r-- | netwerk/protocol/http/Http2Stream.cpp | 1472 |
1 files changed, 1472 insertions, 0 deletions
diff --git a/netwerk/protocol/http/Http2Stream.cpp b/netwerk/protocol/http/Http2Stream.cpp new file mode 100644 index 000000000..5c562557c --- /dev/null +++ b/netwerk/protocol/http/Http2Stream.cpp @@ -0,0 +1,1472 @@ +/* -*- 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" + +namespace mozilla { +namespace net { + +Http2Stream::Http2Stream(nsAHttpTransaction *httpTransaction, + Http2Session *session, + int32_t priority) + : mStreamID(0) + , mSession(session) + , mSegmentReader(nullptr) + , mSegmentWriter(nullptr) + , mUpstreamState(GENERATING_HEADERS) + , mState(IDLE) + , mRequestHeadersDone(0) + , mOpenGenerated(0) + , mAllHeadersReceived(0) + , mQueued(0) + , mTransaction(httpTransaction) + , mSocketTransport(session->SocketTransport()) + , mChunkSize(session->SendingChunkSize()) + , mRequestBlockedOnRead(0) + , mRecvdFin(0) + , mReceivedData(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 = 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)); +} + +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; +} + +uint64_t +Http2Stream::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 +Http2Stream::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 +Http2Stream::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 +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, 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); + 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); + + nsAutoCString requestURI; + head->RequestURI(requestURI); + CreatePushHashKey(nsDependentCString(head->IsHTTPS() ? "https" : "http"), + authorityHeader, mSession->Serial(), + requestURI, + mOrigin, hashkey); + + // check the push cache for GET + if (head->IsGet()) { + // from :scheme, :authority, :path + nsIRequestContext *requestContext = mTransaction->RequestContext(); + SpdyPushCache *cache = nullptr; + if (requestContext) { + requestContext->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 requestcontext=%p cache=%p hit=%p\n", + mSession, hashkey.get(), requestContext, cache, pushedStream)); + + if (pushedStream) { + LOG3(("Pushed Stream Match located %p id=0x%X key=%s\n", + pushedStream, 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; + + nsHttpRequestHead *head = mTransaction->RequestHead(); + nsAutoCString requestURI; + head->RequestURI(requestURI); + LOG3(("Http2Stream %p Stream ID 0x%X [session=%p] for URI %s\n", + this, mStreamID, mSession, 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()); + } + + nsAutoCString method; + nsAutoCString path; + head->Method(method); + head->Path(path); + mSession->Compressor()->EncodeHeaderBlock(mFlatHttpRequestHeaders, + method, + 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()) { + // 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, 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 + 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, 0, + 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 (("id 0x%X decoded push headers %s %s %s are:\n%s", mStreamID, + mHeaderScheme.get(), mHeaderHost.get(), mHeaderPath.get(), + aHeadersOut.BeginReading())); + return NS_OK; +} + +void +Http2Stream::Close(nsresult reason) +{ + mTransaction->Close(reason); +} + +void +Http2Stream::SetResponseIsComplete() +{ + nsHttpTransaction *trans = mTransaction->QueryHttpTransaction(); + if (trans) { + trans->SetResponseIsComplete(); + } +} + +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=%" PRId64 " session window=%" PRId64 " " + "max frame=%d USING=%u\n", this, mStreamID, + count, mChunkSize, mServerReceiveWindow, mSession->ServerSessionWindow(), + Http2Session::kMaxFrameData, dataLength)); + + mSession->DecrementServerSessionWindow(dataLength); + mServerReceiveWindow -= dataLength; + + LOG3(("Http2Stream %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); + MOZ_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=%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; + + case UPSTREAM_COMPLETE: + MOZ_ASSERT(mPushSource); + rv = TransmitFrame(nullptr, nullptr, true); + 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 && mSimpleBuffer.Available()) { + *countWritten = mSimpleBuffer.Read(buf, count); + MOZ_ASSERT(*countWritten); + LOG3(("Http2Stream::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); +} + +/// 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 |