зеркало из https://github.com/mozilla/gecko-dev.git
276 строки
11 KiB
C++
276 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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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 nsHttpTransaction_h__
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#define nsHttpTransaction_h__
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#include "nsHttp.h"
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#include "nsHttpHeaderArray.h"
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#include "nsAHttpTransaction.h"
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#include "nsAHttpConnection.h"
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#include "nsCOMPtr.h"
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#include "nsIPipe.h"
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#include "nsIInputStream.h"
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#include "nsIOutputStream.h"
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#include "nsIInterfaceRequestor.h"
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#include "nsISocketTransportService.h"
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#include "nsITransport.h"
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#include "nsIEventTarget.h"
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#include "TimingStruct.h"
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//-----------------------------------------------------------------------------
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class nsHttpTransaction;
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class nsHttpRequestHead;
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class nsHttpResponseHead;
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class nsHttpChunkedDecoder;
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class nsIHttpActivityObserver;
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//-----------------------------------------------------------------------------
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// nsHttpTransaction represents a single HTTP transaction. It is thread-safe,
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// intended to run on the socket thread.
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//-----------------------------------------------------------------------------
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class nsHttpTransaction : public nsAHttpTransaction
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, public nsIInputStreamCallback
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, public nsIOutputStreamCallback
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{
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSAHTTPTRANSACTION
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NS_DECL_NSIINPUTSTREAMCALLBACK
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NS_DECL_NSIOUTPUTSTREAMCALLBACK
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nsHttpTransaction();
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virtual ~nsHttpTransaction();
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//
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// called to initialize the transaction
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//
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// @param caps
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// the transaction capabilities (see nsHttp.h)
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// @param connInfo
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// the connection type for this transaction.
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// @param reqHeaders
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// the request header struct
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// @param reqBody
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// the request body (POST or PUT data stream)
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// @param reqBodyIncludesHeaders
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// fun stuff to support NPAPI plugins.
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// @param target
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// the dispatch target were notifications should be sent.
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// @param callbacks
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// the notification callbacks to be given to PSM.
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// @param responseBody
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// the input stream that will contain the response data. async
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// wait on this input stream for data. on first notification,
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// headers should be available (check transaction status).
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//
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nsresult Init(PRUint8 caps,
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nsHttpConnectionInfo *connInfo,
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nsHttpRequestHead *reqHeaders,
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nsIInputStream *reqBody,
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bool reqBodyIncludesHeaders,
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nsIEventTarget *consumerTarget,
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nsIInterfaceRequestor *callbacks,
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nsITransportEventSink *eventsink,
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nsIAsyncInputStream **responseBody);
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// attributes
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nsHttpConnectionInfo *ConnectionInfo() { return mConnInfo; }
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nsHttpResponseHead *ResponseHead() { return mHaveAllHeaders ? mResponseHead : nullptr; }
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nsISupports *SecurityInfo() { return mSecurityInfo; }
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nsIInterfaceRequestor *Callbacks() { return mCallbacks; }
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nsIEventTarget *ConsumerTarget() { return mConsumerTarget; }
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// Called to take ownership of the response headers; the transaction
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// will drop any reference to the response headers after this call.
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nsHttpResponseHead *TakeResponseHead();
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// Called to find out if the transaction generated a complete response.
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bool ResponseIsComplete() { return mResponseIsComplete; }
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bool SSLConnectFailed() { return mSSLConnectFailed; }
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// SetPriority() may only be used by the connection manager.
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void SetPriority(PRInt32 priority) { mPriority = priority; }
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PRInt32 Priority() { return mPriority; }
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const TimingStruct& Timings() const { return mTimings; }
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enum Classifier Classification() { return mClassification; }
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void PrintDiagnostics(nsCString &log);
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private:
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nsresult Restart();
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nsresult RestartInProgress();
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char *LocateHttpStart(char *buf, PRUint32 len,
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bool aAllowPartialMatch);
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nsresult ParseLine(char *line);
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nsresult ParseLineSegment(char *seg, PRUint32 len);
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nsresult ParseHead(char *, PRUint32 count, PRUint32 *countRead);
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nsresult HandleContentStart();
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nsresult HandleContent(char *, PRUint32 count, PRUint32 *contentRead, PRUint32 *contentRemaining);
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nsresult ProcessData(char *, PRUint32, PRUint32 *);
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void DeleteSelfOnConsumerThread();
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Classifier Classify();
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void CancelPipeline(PRUint32 reason);
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static NS_METHOD ReadRequestSegment(nsIInputStream *, void *, const char *,
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PRUint32, PRUint32, PRUint32 *);
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static NS_METHOD WritePipeSegment(nsIOutputStream *, void *, char *,
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PRUint32, PRUint32, PRUint32 *);
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bool TimingEnabled() const { return mCaps & NS_HTTP_TIMING_ENABLED; }
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private:
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nsCOMPtr<nsIInterfaceRequestor> mCallbacks;
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nsCOMPtr<nsITransportEventSink> mTransportSink;
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nsCOMPtr<nsIEventTarget> mConsumerTarget;
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nsCOMPtr<nsISupports> mSecurityInfo;
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nsCOMPtr<nsIAsyncInputStream> mPipeIn;
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nsCOMPtr<nsIAsyncOutputStream> mPipeOut;
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nsCOMPtr<nsISupports> mChannel;
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nsCOMPtr<nsIHttpActivityObserver> mActivityDistributor;
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nsCString mReqHeaderBuf; // flattened request headers
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nsCOMPtr<nsIInputStream> mRequestStream;
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PRUint64 mRequestSize;
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nsAHttpConnection *mConnection; // hard ref
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nsHttpConnectionInfo *mConnInfo; // hard ref
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nsHttpRequestHead *mRequestHead; // weak ref
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nsHttpResponseHead *mResponseHead; // hard ref
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nsAHttpSegmentReader *mReader;
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nsAHttpSegmentWriter *mWriter;
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nsCString mLineBuf; // may contain a partial line
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PRInt64 mContentLength; // equals -1 if unknown
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PRInt64 mContentRead; // count of consumed content bytes
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// After a 304/204 or other "no-content" style response we will skip over
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// up to MAX_INVALID_RESPONSE_BODY_SZ bytes when looking for the next
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// response header to deal with servers that actually sent a response
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// body where they should not have. This member tracks how many bytes have
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// so far been skipped.
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PRUint32 mInvalidResponseBytesRead;
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nsHttpChunkedDecoder *mChunkedDecoder;
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TimingStruct mTimings;
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nsresult mStatus;
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PRInt16 mPriority;
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PRUint16 mRestartCount; // the number of times this transaction has been restarted
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PRUint8 mCaps;
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enum Classifier mClassification;
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PRInt32 mPipelinePosition;
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PRInt64 mMaxPipelineObjectSize;
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nsHttpVersion mHttpVersion;
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// state flags, all logically boolean, but not packed together into a
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// bitfield so as to avoid bitfield-induced races. See bug 560579.
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bool mClosed;
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bool mConnected;
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bool mHaveStatusLine;
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bool mHaveAllHeaders;
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bool mTransactionDone;
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bool mResponseIsComplete;
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bool mDidContentStart;
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bool mNoContent; // expecting an empty entity body
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bool mSentData;
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bool mReceivedData;
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bool mStatusEventPending;
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bool mHasRequestBody;
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bool mSSLConnectFailed;
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bool mHttpResponseMatched;
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bool mPreserveStream;
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// mClosed := transaction has been explicitly closed
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// mTransactionDone := transaction ran to completion or was interrupted
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// mResponseComplete := transaction ran to completion
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// For Restart-In-Progress Functionality
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bool mReportedStart;
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bool mReportedResponseHeader;
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// protected by nsHttp::GetLock()
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nsHttpResponseHead *mForTakeResponseHead;
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bool mResponseHeadTaken;
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class RestartVerifier
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{
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// When a idemptotent transaction has received part of its response body
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// and incurs an error it can be restarted. To do this we mark the place
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// where we stopped feeding the body to the consumer and start the
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// network call over again. If everything we track (headers, length, etc..)
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// matches up to the place where we left off then the consumer starts being
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// fed data again with the new information. This can be done N times up
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// to the normal restart (i.e. with no response info) limit.
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public:
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RestartVerifier()
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: mContentLength(-1)
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, mAlreadyProcessed(0)
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, mToReadBeforeRestart(0)
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, mSetup(false)
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{}
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~RestartVerifier() {}
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void Set(PRInt64 contentLength, nsHttpResponseHead *head);
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bool Verify(PRInt64 contentLength, nsHttpResponseHead *head);
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bool IsDiscardingContent() { return mToReadBeforeRestart != 0; }
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bool IsSetup() { return mSetup; }
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PRInt64 AlreadyProcessed() { return mAlreadyProcessed; }
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void SetAlreadyProcessed(PRInt64 val) {
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mAlreadyProcessed = val;
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mToReadBeforeRestart = val;
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}
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PRInt64 ToReadBeforeRestart() { return mToReadBeforeRestart; }
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void HaveReadBeforeRestart(PRUint32 amt)
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{
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NS_ABORT_IF_FALSE(amt <= mToReadBeforeRestart,
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"too large of a HaveReadBeforeRestart deduction");
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mToReadBeforeRestart -= amt;
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}
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private:
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// This is the data from the first complete response header
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// used to make sure that all subsequent response headers match
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PRInt64 mContentLength;
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nsCString mETag;
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nsCString mLastModified;
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nsCString mContentRange;
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nsCString mContentEncoding;
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nsCString mTransferEncoding;
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// This is the amount of data that has been passed to the channel
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// from previous iterations of the transaction and must therefore
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// be skipped in the new one.
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PRInt64 mAlreadyProcessed;
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// The amount of data that must be discarded in the current iteration
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// (where iteration > 0) to reach the mAlreadyProcessed high water
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// mark.
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PRInt64 mToReadBeforeRestart;
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// true when ::Set has been called with a response header
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bool mSetup;
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} mRestartInProgressVerifier;
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};
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#endif // nsHttpTransaction_h__
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