More integration work for texture fetch timeouts.

The fetch state machine received a new timeout during the WAIT_HTTP_REQ
state.  For the integration, rather than jump the state to done, we issue
a request cancel and let the notification plumbing do the rest without
any race conditions or special-case logic.

indra/llcorehttp/_httplibcurl.cpp

@@ -189,6 +189,30 @@ void HttpLibcurl::addOp(HttpOpRequest * op)
 }
 
 
+// Implements the transport part of any cancel operation.
+// See if the handle is an active operation and if so,
+// use the more complicated transport-based cancelation
+// method to kill the request.
+bool HttpLibcurl::cancel(HttpHandle handle)
+{
+	HttpOpRequest * op(static_cast<HttpOpRequest *>(handle));
+	active_set_t::iterator it(mActiveOps.find(op));
+	if (mActiveOps.end() == it)
+	{
+		return false;
+	}
+
+	// Cancel request
+	cancelRequest(op);
+
+	// Drop references
+	mActiveOps.erase(it);
+	op->release();
+
+	return true;
+}
+
+
 // *NOTE:  cancelRequest logic parallels completeRequest logic.
 // Keep them synchronized as necessary.  Caller is expected to
 // remove to op from the active list and release the op *after*

indra/llcorehttp/_httplibcurl.h

@@ -85,6 +85,9 @@ class HttpLibcurl
 	int getActiveCount() const;
 	int getActiveCountInClass(int policy_class) const;
 
+	// Shadows HttpService's method
+	bool cancel(HttpHandle handle);
+
 protected:
 	/// Invoked when libcurl has indicated a request has been processed
 	/// to completion and we need to move the request to a new state.

indra/llcorehttp/_httpopcancel.cpp

@@ -61,7 +61,11 @@ HttpOpCancel::~HttpOpCancel()
 
 void HttpOpCancel::stageFromRequest(HttpService * service)
 {
-	// *FIXME:  Need cancel functionality into services
+	if (! service->cancel(mHandle))
+	{
+		mStatus = HttpStatus(HttpStatus::LLCORE, HE_HANDLE_NOT_FOUND);
+	}
+	
 	addAsReply();
 }
 

indra/llcorehttp/_httppolicy.cpp

@@ -231,9 +231,12 @@ bool HttpPolicy::changePriority(HttpHandle handle, HttpRequest::priority_t prior
 	for (int policy_class(0); policy_class < mActiveClasses; ++policy_class)
 	{
 		State & state(mState[policy_class]);
-		HttpReadyQueue::container_type & c(state.mReadyQueue.get_container());
-	
+		// We don't scan retry queue because a priority change there
+		// is meaningless.  The request will be issued based on retry
+		// intervals not priority value, which is now moot.
+		
 		// Scan ready queue for requests that match policy
+		HttpReadyQueue::container_type & c(state.mReadyQueue.get_container());
 		for (HttpReadyQueue::container_type::iterator iter(c.begin()); c.end() != iter;)
 		{
 			HttpReadyQueue::container_type::iterator cur(iter++);
@@ -253,6 +256,48 @@ bool HttpPolicy::changePriority(HttpHandle handle, HttpRequest::priority_t prior
 }
 
 
+bool HttpPolicy::cancel(HttpHandle handle)
+{
+	for (int policy_class(0); policy_class < mActiveClasses; ++policy_class)
+	{
+		State & state(mState[policy_class]);
+
+		// Scan retry queue
+		HttpRetryQueue::container_type & c1(state.mRetryQueue.get_container());
+		for (HttpRetryQueue::container_type::iterator iter(c1.begin()); c1.end() != iter;)
+		{
+			HttpRetryQueue::container_type::iterator cur(iter++);
+
+			if (static_cast<HttpHandle>(*cur) == handle)
+			{
+				HttpOpRequest * op(*cur);
+				c1.erase(cur);									// All iterators are now invalidated
+				op->cancel();
+				op->release();
+				return true;
+			}
+		}
+		
+		// Scan ready queue
+		HttpReadyQueue::container_type & c2(state.mReadyQueue.get_container());
+		for (HttpReadyQueue::container_type::iterator iter(c2.begin()); c2.end() != iter;)
+		{
+			HttpReadyQueue::container_type::iterator cur(iter++);
+
+			if (static_cast<HttpHandle>(*cur) == handle)
+			{
+				HttpOpRequest * op(*cur);
+				c2.erase(cur);									// All iterators are now invalidated
+				op->cancel();
+				op->release();
+				return true;
+			}
+		}
+	}
+	
+	return false;
+}
+
 bool HttpPolicy::stageAfterCompletion(HttpOpRequest * op)
 {
 	static const HttpStatus cant_connect(HttpStatus::EXT_CURL_EASY, CURLE_COULDNT_CONNECT);

indra/llcorehttp/_httppolicy.h

@@ -92,6 +92,9 @@ class HttpPolicy
 	// Shadows HttpService's method
 	bool changePriority(HttpHandle handle, HttpRequest::priority_t priority);
 
+	// Shadows HttpService's method as well
+	bool cancel(HttpHandle handle);
+
 	/// When transport is finished with an op and takes it off the
 	/// active queue, it is delivered here for dispatch.  Policy
 	/// may send it back to the ready/retry queues if it needs another

indra/llcorehttp/_httpservice.cpp

@@ -219,6 +219,31 @@ bool HttpService::changePriority(HttpHandle handle, HttpRequest::priority_t prio
 }
 
 
+	/// Try to find the given request handle on any of the request
+	/// queues and cancel the operation.
+	///
+	/// @return			True if the request was canceled.
+	///
+	/// Threading:  callable by worker thread.
+bool HttpService::cancel(HttpHandle handle)
+{
+	bool canceled(false);
+
+	// Request can't be on request queue so skip that.
+
+	// Check the policy component's queues first
+	canceled = mPolicy->cancel(handle);
+
+	if (! canceled)
+	{
+		// If that didn't work, check transport's.
+		canceled = mTransport->cancel(handle);
+	}
+	
+	return canceled;
+}
+
+	
 /// Threading:  callable by worker thread.
 void HttpService::shutdown()
 {

indra/llcorehttp/_httpservice.h

@@ -154,6 +154,14 @@ class HttpService
 	/// Threading:  callable by worker thread.
 	bool changePriority(HttpHandle handle, HttpRequest::priority_t priority);
 	
+	/// Try to find the given request handle on any of the request
+	/// queues and cancel the operation.
+	///
+	/// @return			True if the request was found and canceled.
+	///
+	/// Threading:  callable by worker thread.
+	bool cancel(HttpHandle handle);
+	
 	/// Threading:  callable by worker thread.
 	HttpPolicy & getPolicy()
 		{

indra/newview/lltexturefetch.cpp

@@ -1560,8 +1560,24 @@ bool LLTextureFetchWorker::doWork(S32 param)
 			if(FETCHING_TIMEOUT < mRequestedTimer.getElapsedTimeF32())
 			{
 				//timeout, abort.
-				mState = DONE;
-				return true;
+				LL_WARNS("Texture") << "Fetch of texture " << mID << " timed out after "
+									<< mRequestedTimer.getElapsedTimeF32()
+									<< " seconds.  Canceling request." << LL_ENDL;
+
+				if (LLCORE_HTTP_HANDLE_INVALID != mHttpHandle)
+				{
+					// Issue cancel on any outstanding request.  Asynchronous
+					// so cancel may not actually take effect if operation is
+					// complete & queued.  Either way, notification will
+					// complete and the request can be transitioned.
+					mFetcher->mHttpRequest->requestCancel(mHttpHandle, NULL);
+				}
+				else
+				{
+					// Shouldn't happen but if it does, cancel quickly.
+					mState = DONE;
+					return true;
+				}
 			}
 
 			setPriority(LLWorkerThread::PRIORITY_LOW | mWorkPriority);