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502 lines
20 KiB
C++
502 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_net_Http2Session_h
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#define mozilla_net_Http2Session_h
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// HTTP/2
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#include "ASpdySession.h"
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#include "mozilla/Attributes.h"
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#include "nsAHttpConnection.h"
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#include "nsClassHashtable.h"
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#include "nsDataHashtable.h"
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#include "nsDeque.h"
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#include "nsHashKeys.h"
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#include "Http2Compression.h"
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class nsISocketTransport;
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namespace mozilla {
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namespace net {
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class Http2PushedStream;
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class Http2Stream;
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class nsHttpTransaction;
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class Http2Session MOZ_FINAL : public ASpdySession
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, public nsAHttpConnection
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, public nsAHttpSegmentReader
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, public nsAHttpSegmentWriter
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{
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~Http2Session();
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSAHTTPTRANSACTION
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NS_DECL_NSAHTTPCONNECTION(mConnection)
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NS_DECL_NSAHTTPSEGMENTREADER
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NS_DECL_NSAHTTPSEGMENTWRITER
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Http2Session(nsISocketTransport *, uint32_t version);
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bool AddStream(nsAHttpTransaction *, int32_t,
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bool, nsIInterfaceRequestor *) MOZ_OVERRIDE;
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bool CanReuse() MOZ_OVERRIDE { return !mShouldGoAway && !mClosed; }
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bool RoomForMoreStreams() MOZ_OVERRIDE;
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// When the connection is active this is called up to once every 1 second
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// return the interval (in seconds) that the connection next wants to
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// have this invoked. It might happen sooner depending on the needs of
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// other connections.
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uint32_t ReadTimeoutTick(PRIntervalTime now) MOZ_OVERRIDE;
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// Idle time represents time since "goodput".. e.g. a data or header frame
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PRIntervalTime IdleTime() MOZ_OVERRIDE;
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// Registering with a newID of 0 means pick the next available odd ID
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uint32_t RegisterStreamID(Http2Stream *, uint32_t aNewID = 0);
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/*
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HTTP/2 framing
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Length (16) | Type (8) | Flags (8) |
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+-+-------------+---------------+-------------------------------+
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|R| Stream Identifier (31) |
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+-+-------------------------------------------------------------+
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| Frame Data (0...) ...
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+---------------------------------------------------------------+
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*/
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enum frameType {
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FRAME_TYPE_DATA = 0x0,
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FRAME_TYPE_HEADERS = 0x1,
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FRAME_TYPE_PRIORITY = 0x2,
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FRAME_TYPE_RST_STREAM = 0x3,
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FRAME_TYPE_SETTINGS = 0x4,
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FRAME_TYPE_PUSH_PROMISE = 0x5,
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FRAME_TYPE_PING = 0x6,
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FRAME_TYPE_GOAWAY = 0x7,
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FRAME_TYPE_WINDOW_UPDATE = 0x8,
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FRAME_TYPE_CONTINUATION = 0x9,
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FRAME_TYPE_ALTSVC = 0xA,
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FRAME_TYPE_LAST = 0xB
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};
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// NO_ERROR is a macro defined on windows, so we'll name the HTTP2 goaway
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// code NO_ERROR to be NO_HTTP_ERROR
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enum errorType {
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NO_HTTP_ERROR = 0,
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PROTOCOL_ERROR = 1,
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INTERNAL_ERROR = 2,
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FLOW_CONTROL_ERROR = 3,
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SETTINGS_TIMEOUT_ERROR = 4,
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STREAM_CLOSED_ERROR = 5,
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FRAME_SIZE_ERROR = 6,
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REFUSED_STREAM_ERROR = 7,
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CANCEL_ERROR = 8,
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COMPRESSION_ERROR = 9,
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CONNECT_ERROR = 10,
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ENHANCE_YOUR_CALM = 11,
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INADEQUATE_SECURITY = 12,
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HTTP_1_1_REQUIRED = 13
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};
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// These are frame flags. If they, or other undefined flags, are
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// used on frames other than the comments indicate they MUST be ignored.
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const static uint8_t kFlag_END_STREAM = 0x01; // data, headers
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const static uint8_t kFlag_END_HEADERS = 0x04; // headers, continuation
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const static uint8_t kFlag_END_PUSH_PROMISE = 0x04; // push promise
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const static uint8_t kFlag_ACK = 0x01; // ping and settings
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const static uint8_t kFlag_PADDED = 0x08; // data, headers, push promise, continuation
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const static uint8_t kFlag_PRIORITY = 0x20; // headers
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enum {
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SETTINGS_TYPE_HEADER_TABLE_SIZE = 1, // compression table size
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SETTINGS_TYPE_ENABLE_PUSH = 2, // can be used to disable push
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SETTINGS_TYPE_MAX_CONCURRENT = 3, // streams recvr allowed to initiate
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SETTINGS_TYPE_INITIAL_WINDOW = 4, // bytes for flow control default
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SETTINGS_TYPE_MAX_FRAME_SIZE = 5 // max frame size settings sender allows receipt of
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};
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// This should be big enough to hold all of your control packets,
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// but if it needs to grow for huge headers it can do so dynamically.
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const static uint32_t kDefaultBufferSize = 2048;
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// kDefaultQueueSize must be >= other queue size constants
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const static uint32_t kDefaultQueueSize = 32768;
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const static uint32_t kQueueMinimumCleanup = 24576;
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const static uint32_t kQueueTailRoom = 4096;
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const static uint32_t kQueueReserved = 1024;
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const static uint32_t kMaxStreamID = 0x7800000;
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// This is a sentinel for a deleted stream. It is not a valid
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// 31 bit stream ID.
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const static uint32_t kDeadStreamID = 0xffffdead;
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// below the emergency threshold of local window we ack every received
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// byte. Above that we coalesce bytes into the MinimumToAck size.
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const static int32_t kEmergencyWindowThreshold = 256 * 1024;
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const static uint32_t kMinimumToAck = 4 * 1024 * 1024;
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// The default rwin is 64KB - 1 unless updated by a settings frame
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const static uint32_t kDefaultRwin = 65535;
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// We limit frames to 2^14 bytes of length in order to preserve responsiveness
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// This is the smallest allowed value for SETTINGS_MAX_FRAME_SIZE
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const static uint32_t kMaxFrameData = 0x4000;
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const static uint8_t kFrameLengthBytes = 3;
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const static uint8_t kFrameStreamIDBytes = 4;
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const static uint8_t kFrameFlagBytes = 1;
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const static uint8_t kFrameTypeBytes = 1;
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const static uint8_t kFrameHeaderBytes = kFrameLengthBytes + kFrameFlagBytes +
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kFrameTypeBytes + kFrameStreamIDBytes;
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enum {
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kLeaderGroupID = 0x3,
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kOtherGroupID = 0x5,
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kBackgroundGroupID = 0x7,
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kSpeculativeGroupID = 0x9,
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kFollowerGroupID = 0xB
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};
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static nsresult RecvHeaders(Http2Session *);
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static nsresult RecvPriority(Http2Session *);
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static nsresult RecvRstStream(Http2Session *);
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static nsresult RecvSettings(Http2Session *);
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static nsresult RecvPushPromise(Http2Session *);
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static nsresult RecvPing(Http2Session *);
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static nsresult RecvGoAway(Http2Session *);
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static nsresult RecvWindowUpdate(Http2Session *);
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static nsresult RecvContinuation(Http2Session *);
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static nsresult RecvAltSvc(Http2Session *);
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char *EnsureOutputBuffer(uint32_t needed);
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template<typename charType>
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void CreateFrameHeader(charType dest, uint16_t frameLength,
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uint8_t frameType, uint8_t frameFlags,
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uint32_t streamID);
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// For writing the data stream to LOG4
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static void LogIO(Http2Session *, Http2Stream *, const char *,
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const char *, uint32_t);
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// an overload of nsAHttpConnection
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void TransactionHasDataToWrite(nsAHttpTransaction *) MOZ_OVERRIDE;
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// a similar version for Http2Stream
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void TransactionHasDataToWrite(Http2Stream *);
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// an overload of nsAHttpSegementReader
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virtual nsresult CommitToSegmentSize(uint32_t size, bool forceCommitment) MOZ_OVERRIDE;
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nsresult BufferOutput(const char *, uint32_t, uint32_t *);
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void FlushOutputQueue();
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uint32_t AmountOfOutputBuffered() { return mOutputQueueUsed - mOutputQueueSent; }
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uint32_t GetServerInitialStreamWindow() { return mServerInitialStreamWindow; }
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bool TryToActivate(Http2Stream *stream);
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void ConnectPushedStream(Http2Stream *stream);
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nsresult ConfirmTLSProfile();
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static bool ALPNCallback(nsISupports *securityInfo);
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uint64_t Serial() { return mSerial; }
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void PrintDiagnostics (nsCString &log) MOZ_OVERRIDE;
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// Streams need access to these
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uint32_t SendingChunkSize() { return mSendingChunkSize; }
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uint32_t PushAllowance() { return mPushAllowance; }
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Http2Compressor *Compressor() { return &mCompressor; }
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nsISocketTransport *SocketTransport() { return mSocketTransport; }
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int64_t ServerSessionWindow() { return mServerSessionWindow; }
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void DecrementServerSessionWindow (uint32_t bytes) { mServerSessionWindow -= bytes; }
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void GetNegotiatedToken(nsACString &s) { s.Assign(mNegotiatedToken); }
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void SendPing() MOZ_OVERRIDE;
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bool UseH2Deps() { return mUseH2Deps; }
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private:
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// These internal states do not correspond to the states of the HTTP/2 specification
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enum internalStateType {
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BUFFERING_OPENING_SETTINGS,
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BUFFERING_FRAME_HEADER,
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BUFFERING_CONTROL_FRAME,
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PROCESSING_DATA_FRAME_PADDING_CONTROL,
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PROCESSING_DATA_FRAME,
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DISCARDING_DATA_FRAME_PADDING,
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DISCARDING_DATA_FRAME,
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PROCESSING_COMPLETE_HEADERS,
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PROCESSING_CONTROL_RST_STREAM
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};
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static const uint8_t kMagicHello[24];
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nsresult ResponseHeadersComplete();
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uint32_t GetWriteQueueSize();
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void ChangeDownstreamState(enum internalStateType);
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void ResetDownstreamState();
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nsresult ReadyToProcessDataFrame(enum internalStateType);
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nsresult UncompressAndDiscard();
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void GeneratePing(bool);
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void GenerateSettingsAck();
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void GeneratePriority(uint32_t, uint8_t);
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void GenerateRstStream(uint32_t, uint32_t);
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void GenerateGoAway(uint32_t);
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void CleanupStream(Http2Stream *, nsresult, errorType);
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void CleanupStream(uint32_t, nsresult, errorType);
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void CloseStream(Http2Stream *, nsresult);
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void SendHello();
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void RemoveStreamFromQueues(Http2Stream *);
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nsresult ParsePadding(uint8_t &, uint16_t &);
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void SetWriteCallbacks();
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void RealignOutputQueue();
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void ProcessPending();
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nsresult SetInputFrameDataStream(uint32_t);
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void CreatePriorityNode(uint32_t, uint32_t, uint8_t, const char *);
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bool VerifyStream(Http2Stream *, uint32_t);
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void SetNeedsCleanup();
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void UpdateLocalRwin(Http2Stream *stream, uint32_t bytes);
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void UpdateLocalStreamWindow(Http2Stream *stream, uint32_t bytes);
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void UpdateLocalSessionWindow(uint32_t bytes);
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void MaybeDecrementConcurrent(Http2Stream *stream);
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bool RoomForMoreConcurrent();
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void IncrementConcurrent(Http2Stream *stream);
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void QueueStream(Http2Stream *stream);
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// a wrapper for all calls to the nshttpconnection level segment writer. Used
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// to track network I/O for timeout purposes
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nsresult NetworkRead(nsAHttpSegmentWriter *, char *, uint32_t, uint32_t *);
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static PLDHashOperator ShutdownEnumerator(nsAHttpTransaction *,
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nsAutoPtr<Http2Stream> &,
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void *);
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static PLDHashOperator GoAwayEnumerator(nsAHttpTransaction *,
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nsAutoPtr<Http2Stream> &,
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void *);
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static PLDHashOperator UpdateServerRwinEnumerator(nsAHttpTransaction *,
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nsAutoPtr<Http2Stream> &,
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void *);
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static PLDHashOperator RestartBlockedOnRwinEnumerator(nsAHttpTransaction *,
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nsAutoPtr<Http2Stream> &,
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void *);
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// This is intended to be nsHttpConnectionMgr:nsConnectionHandle taken
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// from the first transaction on this session. That object contains the
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// pointer to the real network-level nsHttpConnection object.
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nsRefPtr<nsAHttpConnection> mConnection;
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// The underlying socket transport object is needed to propogate some events
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nsISocketTransport *mSocketTransport;
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// These are temporary state variables to hold the argument to
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// Read/WriteSegments so it can be accessed by On(read/write)segment
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// further up the stack.
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nsAHttpSegmentReader *mSegmentReader;
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nsAHttpSegmentWriter *mSegmentWriter;
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uint32_t mSendingChunkSize; /* the transmission chunk size */
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uint32_t mNextStreamID; /* 24 bits */
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uint32_t mConcurrentHighWater; /* max parallelism on session */
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uint32_t mPushAllowance; /* rwin for unmatched pushes */
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internalStateType mDownstreamState; /* in frame, between frames, etc.. */
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// Maintain 2 indexes - one by stream ID, one by transaction pointer.
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// There are also several lists of streams: ready to write, queued due to
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// max parallelism, streams that need to force a read for push, and the full
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// set of pushed streams.
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// The objects are not ref counted - they get destroyed
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// by the nsClassHashtable implementation when they are removed from
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// the transaction hash.
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nsDataHashtable<nsUint32HashKey, Http2Stream *> mStreamIDHash;
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nsClassHashtable<nsPtrHashKey<nsAHttpTransaction>,
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Http2Stream> mStreamTransactionHash;
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nsDeque mReadyForWrite;
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nsDeque mQueuedStreams;
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nsDeque mReadyForRead;
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nsTArray<Http2PushedStream *> mPushedStreams;
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// Compression contexts for header transport.
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// HTTP/2 compresses only HTTP headers and does not reset the context in between
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// frames. Even data that is not associated with a stream (e.g invalid
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// stream ID) is passed through these contexts to keep the compression
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// context correct.
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Http2Compressor mCompressor;
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Http2Decompressor mDecompressor;
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nsCString mDecompressBuffer;
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// mInputFrameBuffer is used to store received control packets and the 8 bytes
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// of header on data packets
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uint32_t mInputFrameBufferSize; // buffer allocation
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uint32_t mInputFrameBufferUsed; // amt of allocation used
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nsAutoArrayPtr<char> mInputFrameBuffer;
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// mInputFrameDataSize/Read are used for tracking the amount of data consumed
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// in a frame after the 8 byte header. Control frames are always fully buffered
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// and the fixed 8 byte leading header is at mInputFrameBuffer + 0, the first
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// data byte (i.e. the first settings/goaway/etc.. specific byte) is at
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// mInputFrameBuffer + 8
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// The frame size is mInputFrameDataSize + the constant 8 byte header
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uint32_t mInputFrameDataSize;
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uint32_t mInputFrameDataRead;
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bool mInputFrameFinal; // This frame was marked FIN
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uint8_t mInputFrameType;
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uint8_t mInputFrameFlags;
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uint32_t mInputFrameID;
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uint16_t mPaddingLength;
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// When a frame has been received that is addressed to a particular stream
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// (e.g. a data frame after the stream-id has been decoded), this points
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// to the stream.
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Http2Stream *mInputFrameDataStream;
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// mNeedsCleanup is a state variable to defer cleanup of a closed stream
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// If needed, It is set in session::OnWriteSegments() and acted on and
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// cleared when the stack returns to session::WriteSegments(). The stream
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// cannot be destroyed directly out of OnWriteSegments because
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// stream::writeSegments() is on the stack at that time.
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Http2Stream *mNeedsCleanup;
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// This reason code in the last processed RESET frame
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uint32_t mDownstreamRstReason;
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// When HEADERS/PROMISE are chained together, this is the expected ID of the next
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// recvd frame which must be the same type
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uint32_t mExpectedHeaderID;
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uint32_t mExpectedPushPromiseID;
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uint32_t mContinuedPromiseStream;
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// for the conversion of downstream http headers into http/2 formatted headers
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// The data here does not persist between frames
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nsCString mFlatHTTPResponseHeaders;
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uint32_t mFlatHTTPResponseHeadersOut;
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// when set, the session will go away when it reaches 0 streams. This flag
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// is set when: the stream IDs are running out (at either the client or the
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// server), when DontReuse() is called, a RST that is not specific to a
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// particular stream is received, a GOAWAY frame has been received from
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// the server.
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bool mShouldGoAway;
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// the session has received a nsAHttpTransaction::Close() call
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bool mClosed;
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// the session received a GoAway frame with a valid GoAwayID
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bool mCleanShutdown;
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// The TLS comlpiance checks are not done in the ctor beacuse of bad
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// exception handling - so we do them at IO time and cache the result
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bool mTLSProfileConfirmed;
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// A specifc reason code for the eventual GoAway frame. If set to NO_HTTP_ERROR
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// only NO_HTTP_ERROR, PROTOCOL_ERROR, or INTERNAL_ERROR will be sent.
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errorType mGoAwayReason;
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// If a GoAway message was received this is the ID of the last valid
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// stream. 0 otherwise. (0 is never a valid stream id.)
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uint32_t mGoAwayID;
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// The last stream processed ID we will send in our GoAway frame.
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uint32_t mOutgoingGoAwayID;
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// The limit on number of concurrent streams for this session. Normally it
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// is basically unlimited, but the SETTINGS control message from the
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// server might bring it down.
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uint32_t mMaxConcurrent;
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// The actual number of concurrent streams at this moment. Generally below
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// mMaxConcurrent, but the max can be lowered in real time to a value
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// below the current value
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uint32_t mConcurrent;
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// The number of server initiated promises, tracked for telemetry
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uint32_t mServerPushedResources;
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// The server rwin for new streams as determined from a SETTINGS frame
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uint32_t mServerInitialStreamWindow;
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// The Local Session window is how much data the server is allowed to send
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// (across all streams) without getting a window update to stream 0. It is
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// signed because asynchronous changes via SETTINGS can drive it negative.
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int64_t mLocalSessionWindow;
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// The Remote Session Window is how much data the client is allowed to send
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// (across all streams) without receiving a window update to stream 0. It is
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// signed because asynchronous changes via SETTINGS can drive it negative.
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int64_t mServerSessionWindow;
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// This is a output queue of bytes ready to be written to the SSL stream.
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// When that streams returns WOULD_BLOCK on direct write the bytes get
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// coalesced together here. This results in larger writes to the SSL layer.
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// The buffer is not dynamically grown to accomodate stream writes, but
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// does expand to accept infallible session wide frames like GoAway and RST.
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uint32_t mOutputQueueSize;
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uint32_t mOutputQueueUsed;
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uint32_t mOutputQueueSent;
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nsAutoArrayPtr<char> mOutputQueueBuffer;
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PRIntervalTime mPingThreshold;
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PRIntervalTime mLastReadEpoch; // used for ping timeouts
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PRIntervalTime mLastDataReadEpoch; // used for IdleTime()
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PRIntervalTime mPingSentEpoch;
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PRIntervalTime mPreviousPingThreshold; // backup for the former value
|
|
bool mPreviousUsed; // true when backup is used
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|
|
|
// used as a temporary buffer while enumerating the stream hash during GoAway
|
|
nsDeque mGoAwayStreamsToRestart;
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|
|
|
// Each session gets a unique serial number because the push cache is correlated
|
|
// by the load group and the serial number can be used as part of the cache key
|
|
// to make sure streams aren't shared across sessions.
|
|
uint64_t mSerial;
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// If push is disabled, we want to be able to send PROTOCOL_ERRORs if we
|
|
// receive a PUSH_PROMISE, but we have to wait for the SETTINGS ACK before
|
|
// we can actually tell the other end to go away. These help us keep track
|
|
// of that state so we can behave appropriately.
|
|
bool mWaitingForSettingsAck;
|
|
bool mGoAwayOnPush;
|
|
|
|
// For caching whether we negotiated "h2" or "h2-<draft>"
|
|
nsCString mNegotiatedToken;
|
|
|
|
bool mUseH2Deps;
|
|
uint32_t mVersion; // HTTP2_VERSION_ from nsHttp.h remove when draft support removed
|
|
|
|
private:
|
|
/// connect tunnels
|
|
void DispatchOnTunnel(nsAHttpTransaction *, nsIInterfaceRequestor *);
|
|
void RegisterTunnel(Http2Stream *);
|
|
void UnRegisterTunnel(Http2Stream *);
|
|
uint32_t FindTunnelCount(nsHttpConnectionInfo *);
|
|
|
|
nsDataHashtable<nsCStringHashKey, uint32_t> mTunnelHash;
|
|
};
|
|
|
|
} // namespace mozilla::net
|
|
} // namespace mozilla
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#endif // mozilla_net_Http2Session_h
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