diff options
Diffstat (limited to 'netwerk/protocol/http/Http2StreamBase.cpp')
| -rw-r--r-- | netwerk/protocol/http/Http2StreamBase.cpp | 1324 |
1 files changed, 1324 insertions, 0 deletions
diff --git a/netwerk/protocol/http/Http2StreamBase.cpp b/netwerk/protocol/http/Http2StreamBase.cpp new file mode 100644 index 0000000000..bb135a59d9 --- /dev/null +++ b/netwerk/protocol/http/Http2StreamBase.cpp @@ -0,0 +1,1324 @@ +/* -*- 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; + } + mPriority = 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; + + if (!session->UseH2Deps()) { + return; + } + + // Urgent start takes an absolute precedence, so don't + // change mPriorityDependency here. + if (mPriorityDependency == Http2Session::kUrgentStartGroupID) { + return; + } + + 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 |