fix(requestmanager): correct cancel request sending

make sure not to send cancel when other peer has already sent terminal status

Author: hannahhoward

Diff for: requestmanager/executor/executor.go

@@ -73,7 +73,9 @@ func (e *Executor) ExecuteTask(ctx context.Context, pid peer.ID, task *peertask.
 	log.Debugw("beginning request execution", "id", requestTask.Request.ID(), "peer", pid.String(), "root_cid", requestTask.Request.Root().String())
 	err := e.traverse(requestTask)
 	if err != nil {
-		e.manager.SendRequest(requestTask.P, gsmsg.CancelRequest(requestTask.Request.ID()))
+		if !isContextErr(err) {
+			e.manager.SendRequest(requestTask.P, gsmsg.CancelRequest(requestTask.Request.ID()))
+		}
 		if !isContextErr(err) && !isPausedErr(err) {
 			select {
 			case <-requestTask.Ctx.Done():

Diff for: requestmanager/executor/executor_test.go

@@ -66,9 +66,7 @@ func TestRequestExecutionBlockChain(t *testing.T) {
 			verifyResults: func(t *testing.T, tbc *testutil.TestBlockChain, ree *requestExecutionEnv, responses []graphsync.ResponseProgress, receivedErrors []error) {
 				tbc.VerifyResponseRangeSync(responses, 0, 6)
 				require.Empty(t, receivedErrors)
-				require.Len(t, ree.requestsSent, 2)
-				require.Equal(t, ree.request, ree.requestsSent[0].request)
-				require.True(t, ree.requestsSent[1].request.IsCancel())
+				require.Equal(t, []requestSent{{ree.p, ree.request}}, ree.requestsSent)
 				require.Len(t, ree.blookHooksCalled, 6)
 				require.EqualError(t, ree.terminalError, ipldutil.ContextCancelError{}.Error())
 			},
@@ -265,7 +263,6 @@ type pauseKey struct {
 type requestExecutionEnv struct {
 	// params
 	ctx              context.Context
-	cancelFn         func()
 	request          gsmsg.GraphSyncRequest
 	p                peer.ID
 	blockHookResults map[blockHookKey]hooks.UpdateResult
@@ -276,7 +273,6 @@ type requestExecutionEnv struct {
 	traverser        ipldutil.Traverser
 	inProgressErr    chan error
 	initialRequest   bool
-	empty            bool
 
 	// results
 	requestsSent     []requestSent
@@ -307,7 +303,7 @@ func (ree *requestExecutionEnv) GetRequestTask(_ peer.ID, _ *peertask.Task, requ
 		Traverser:      ree.traverser,
 		P:              ree.p,
 		InProgressErr:  ree.inProgressErr,
-		Empty:          ree.empty,
+		Empty:          false,
 		InitialRequest: ree.initialRequest,
 	}
 	go func() {

Diff for: requestmanager/server.go

@@ -198,6 +198,7 @@ func (rm *RequestManager) cancelRequest(requestID graphsync.RequestID, onTermina
 	if onTerminated != nil {
 		inProgressRequestStatus.onTerminated = append(inProgressRequestStatus.onTerminated, onTerminated)
 	}
+	rm.SendRequest(inProgressRequestStatus.p, gsmsg.CancelRequest(requestID))
 	rm.cancelOnError(requestID, inProgressRequestStatus, terminalError)
 }
 
@@ -263,6 +264,7 @@ func (rm *RequestManager) processExtensionsForResponse(p peer.ID, response gsmsg
 		if !ok {
 			return false
 		}
+		rm.SendRequest(requestStatus.p, gsmsg.CancelRequest(response.RequestID()))
 		rm.cancelOnError(response.RequestID(), requestStatus, result.Err)
 		return false
 	}
@@ -333,7 +335,7 @@ func (rm *RequestManager) pause(id graphsync.RequestID) error {
 	if !ok {
 		return graphsync.RequestNotFoundErr{}
 	}
-	if inProgressRequestStatus.state != running {
+	if inProgressRequestStatus.state == paused {
 		return errors.New("request is already paused")
 	}
 	select {