OTel-Arrow receiver timeout propagation (open-telemetry#34742)

**Description:** Receiver side of
open-telemetry/otel-arrow#227. The exporter
side is
open-telemetry#34733.
 
**Link to tracking Issue:**
open-telemetry/otel-arrow#227

**Testing:** A new end-to-end integration test. ✅ 

**Documentation:** Since this is expected of gRPC receivers, no docs are
changed.

---------

Signed-off-by: Alex Boten <[email protected]>
Co-authored-by: Bogdan Drutu <[email protected]>
Co-authored-by: Alex Boten <[email protected]>

.chloggen/otelarrow-receiver-timeout.yaml

@@ -0,0 +1,27 @@
+# Use this changelog template to create an entry for release notes.
+
+# One of 'breaking', 'deprecation', 'new_component', 'enhancement', 'bug_fix'
+change_type: enhancement
+
+# The name of the component, or a single word describing the area of concern, (e.g. filelogreceiver)
+component: otelarrowreceiver
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: Add gRPC timeout propagation.
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34742]
+
+# (Optional) One or more lines of additional information to render under the primary note.
+# These lines will be padded with 2 spaces and then inserted directly into the document.
+# Use pipe (|) for multiline entries.
+subtext:
+
+# If your change doesn't affect end users or the exported elements of any package,
+# you should instead start your pull request title with [chore] or use the "Skip Changelog" label.
+# Optional: The change log or logs in which this entry should be included.
+# e.g. '[user]' or '[user, api]'
+# Include 'user' if the change is relevant to end users.
+# Include 'api' if there is a change to a library API.
+# Default: '[user]'
+change_logs: []

internal/otelarrow/test/e2e_test.go

@@ -48,9 +48,15 @@ import (
 type testParams struct {
 	threadCount  int
 	requestUntil func(*testConsumer) bool
+
+	// missingDeadline is configured so the zero value implies a deadline,
+	// which is the default.
+	missingDeadline bool
 }
 
 type testConsumer struct {
+	t *testing.T
+
 	sink      consumertest.TracesSink
 	sentSpans atomic.Int64
 
@@ -62,6 +68,8 @@ type testConsumer struct {
 
 	recvSpans *tracetest.InMemoryExporter
 	expSpans  *tracetest.InMemoryExporter
+
+	expectDeadline bool
 }
 
 var _ consumer.Traces = &testConsumer{}
@@ -80,6 +88,19 @@ func (*testConsumer) Capabilities() consumer.Capabilities {
 
 func (tc *testConsumer) ConsumeTraces(ctx context.Context, td ptrace.Traces) error {
 	time.Sleep(time.Duration(float64(time.Millisecond) * (1 + rand.Float64())))
+
+	dead, hasDeadline := ctx.Deadline()
+	timeout := time.Until(dead)
+
+	require.Equal(tc.t, tc.expectDeadline, hasDeadline, "deadline set or not set: %v", timeout)
+	if tc.expectDeadline {
+		// expect allows 1/6 of the deadline to elapse in transit,
+		// so 1m becomes 50s.
+		expect := tc.expCfg.TimeoutSettings.Timeout * 5 / 6
+		require.Less(tc.t, expect, timeout)
+		require.Greater(tc.t, tc.expCfg.TimeoutSettings.Timeout, timeout)
+	}
+
 	return tc.sink.ConsumeTraces(ctx, td)
 }
 
@@ -100,7 +121,7 @@ func testLoggerSettings(_ *testing.T) (component.TelemetrySettings, *observer.Ob
 	return tset, obslogs, exp
 }
 
-func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces, receiver.Traces) {
+func basicTestConfig(t *testing.T, tp testParams, cfgF CfgFunc) (*testConsumer, exporter.Traces, receiver.Traces) {
 	ctx := context.Background()
 
 	efact := otelarrowexporter.NewFactory()
@@ -115,6 +136,7 @@ func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces
 	addr := testutil.GetAvailableLocalAddress(t)
 
 	receiverCfg.Protocols.GRPC.NetAddr.Endpoint = addr
+
 	exporterCfg.ClientConfig.Endpoint = addr
 	exporterCfg.ClientConfig.WaitForReady = true
 	exporterCfg.ClientConfig.TLSSetting.Insecure = true
@@ -123,6 +145,7 @@ func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces
 	exporterCfg.RetryConfig.Enabled = true
 	exporterCfg.Arrow.NumStreams = 1
 	exporterCfg.Arrow.MaxStreamLifetime = 5 * time.Second
+	exporterCfg.Arrow.DisableDowngrade = true
 
 	if cfgF != nil {
 		cfgF(exporterCfg, receiverCfg)
@@ -132,6 +155,8 @@ func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces
 	recvTset, recvLogs, recvSpans := testLoggerSettings(t)
 
 	testCon := &testConsumer{
+		t: t,
+
 		recvCfg: receiverCfg,
 		expCfg:  exporterCfg,
 
@@ -140,6 +165,8 @@ func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces
 
 		recvSpans: recvSpans,
 		expSpans:  expSpans,
+
+		expectDeadline: !tp.missingDeadline,
 	}
 
 	receiver, err := rfact.CreateTracesReceiver(ctx, receiver.Settings{
@@ -161,7 +188,7 @@ func basicTestConfig(t *testing.T, cfgF CfgFunc) (*testConsumer, exporter.Traces
 func testIntegrationTraces(ctx context.Context, t *testing.T, tp testParams, cfgf CfgFunc, mkgen MkGen, errf ConsumerErrFunc, endf EndFunc) {
 	host := componenttest.NewNopHost()
 
-	testCon, exporter, receiver := basicTestConfig(t, cfgf)
+	testCon, exporter, receiver := basicTestConfig(t, tp, cfgf)
 
 	var startWG sync.WaitGroup
 	var exporterShutdownWG sync.WaitGroup
@@ -426,6 +453,33 @@ func TestIntegrationTracesSimple(t *testing.T) {
 	}
 }
 
+func TestIntegrationDeadlinePropagation(t *testing.T) {
+	for _, hasDeadline := range []bool{false, true} {
+		t.Run(fmt.Sprint("deadline=", hasDeadline), func(t *testing.T) {
+			ctx, cancel := context.WithCancel(context.Background())
+			defer cancel()
+
+			// Until at least one span is written.
+			var params = testParams{
+				threadCount: 1,
+				requestUntil: func(test *testConsumer) bool {
+					return test.sink.SpanCount() < 1
+				},
+				missingDeadline: !hasDeadline,
+			}
+
+			testIntegrationTraces(ctx, t, params, func(ecfg *ExpConfig, _ *RecvConfig) {
+				if !hasDeadline {
+					// 0 disables the exporthelper-set timeout.
+					ecfg.TimeoutSettings.Timeout = 0
+				} else {
+					ecfg.TimeoutSettings.Timeout = 37 * time.Minute
+				}
+			}, func() GenFunc { return makeTestTraces }, consumerSuccess, standardEnding)
+		})
+	}
+}
+
 func TestIntegrationMemoryLimited(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()

receiver/otelarrowreceiver/go.mod

@@ -3,6 +3,7 @@ module github.com/open-telemetry/opentelemetry-collector-contrib/receiver/otelar
 go 1.22.0
 
 require (
+	github.com/open-telemetry/opentelemetry-collector-contrib/internal/grpcutil v0.109.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/otelarrow v0.109.0
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/sharedcomponent v0.109.0
 	github.com/open-telemetry/otel-arrow v0.26.0

receiver/otelarrowreceiver/internal/arrow/arrow.go

@@ -41,6 +41,7 @@ import (
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/proto"
 
+	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/grpcutil"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/otelarrow/admission"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/internal/otelarrow/netstats"
 	internalmetadata "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/otelarrowreceiver/internal/metadata"
@@ -173,7 +174,9 @@ func newHeaderReceiver(streamCtx context.Context, as auth.Server, includeMetadat
 // client.Info with additional key:values associated with the arrow batch.
 func (h *headerReceiver) combineHeaders(ctx context.Context, hdrsBytes []byte) (context.Context, map[string][]string, error) {
 	if len(hdrsBytes) == 0 && len(h.streamHdrs) == 0 {
-		return ctx, nil, nil
+		// Note: call newContext in this case to ensure that
+		// connInfo is added to the context, for Auth.
+		return h.newContext(ctx, nil), nil, nil
 	}
 
 	if len(hdrsBytes) == 0 {
@@ -420,8 +423,8 @@ func (r *Receiver) anyStream(serverStream anyStreamServer, method string) (retEr
 	}
 }
 
-func (r *receiverStream) newInFlightData(ctx context.Context, method string, batchID int64, pendingCh chan<- batchResp) (context.Context, *inFlightData) {
-	ctx, span := r.tracer.Start(ctx, "otel_arrow_stream_inflight")
+func (r *receiverStream) newInFlightData(ctx context.Context, method string, batchID int64, pendingCh chan<- batchResp) *inFlightData {
+	_, span := r.tracer.Start(ctx, "otel_arrow_stream_inflight")
 
 	r.inFlightWG.Add(1)
 	r.telemetryBuilder.OtelArrowReceiverInFlightRequests.Add(ctx, 1)
@@ -433,7 +436,7 @@ func (r *receiverStream) newInFlightData(ctx context.Context, method string, bat
 		span:           span,
 	}
 	id.refs.Add(1)
-	return ctx, id
+	return id
 }
 
 // inFlightData is responsible for storing the resources held by one request.
@@ -549,35 +552,43 @@ func (r *receiverStream) recvOne(streamCtx context.Context, serverStream anyStre
 
 	// Receive a batch corresponding with one ptrace.Traces, pmetric.Metrics,
 	// or plog.Logs item.
-	req, err := serverStream.Recv()
+	req, recvErr := serverStream.Recv()
+
+	// the incoming stream context is the parent of the in-flight context, which
+	// carries a span covering sequential stream-processing work.  the context
+	// is severed at this point, with flight.span a contextless child that will be
+	// finished in recvDone().
+	flight := r.newInFlightData(streamCtx, method, req.GetBatchId(), pendingCh)
 
 	// inflightCtx is carried through into consumeAndProcess on the success path.
-	inflightCtx, flight := r.newInFlightData(streamCtx, method, req.GetBatchId(), pendingCh)
+	// this inherits the stream context so that its auth headers are present
+	// when the per-data Auth call is made.
+	inflightCtx := streamCtx
 	defer flight.recvDone(inflightCtx, &retErr)
 
-	if err != nil {
-		if errors.Is(err, io.EOF) {
-			return err
+	if recvErr != nil {
+		if errors.Is(recvErr, io.EOF) {
+			return recvErr
 
-		} else if errors.Is(err, context.Canceled) {
+		} else if errors.Is(recvErr, context.Canceled) {
 			// This is a special case to avoid introducing a span error
 			// for a canceled operation.
 			return io.EOF
 
-		} else if status, ok := status.FromError(err); ok && status.Code() == codes.Canceled {
+		} else if status, ok := status.FromError(recvErr); ok && status.Code() == codes.Canceled {
 			// This is a special case to avoid introducing a span error
 			// for a canceled operation.
 			return io.EOF
 		}
 		// Note: err is directly from gRPC, should already have status.
-		return err
+		return recvErr
 	}
 
 	// Check for optional headers and set the incoming context.
-	inflightCtx, authHdrs, err := hrcv.combineHeaders(inflightCtx, req.GetHeaders())
-	if err != nil {
+	inflightCtx, authHdrs, hdrErr := hrcv.combineHeaders(inflightCtx, req.GetHeaders())
+	if hdrErr != nil {
 		// Failing to parse the incoming headers breaks the stream.
-		return status.Errorf(codes.Internal, "arrow metadata error: %v", err)
+		return status.Errorf(codes.Internal, "arrow metadata error: %v", hdrErr)
 	}
 
 	// start this span after hrcv.combineHeaders returns extracted context. This will allow this span
@@ -601,9 +612,29 @@ func (r *receiverStream) recvOne(streamCtx context.Context, serverStream anyStre
 		// This is a compressed size so make sure to acquire the difference when request is decompressed.
 		prevAcquiredBytes = int64(proto.Size(req))
 	} else {
-		prevAcquiredBytes, err = strconv.ParseInt(uncompSizeHeaderStr[0], 10, 64)
-		if err != nil {
-			return status.Errorf(codes.Internal, "failed to convert string to request size: %v", err)
+		var parseErr error
+		prevAcquiredBytes, parseErr = strconv.ParseInt(uncompSizeHeaderStr[0], 10, 64)
+		if parseErr != nil {
+			return status.Errorf(codes.Internal, "failed to convert string to request size: %v", parseErr)
+		}
+	}
+
+	var callerCancel context.CancelFunc
+	if encodedTimeout, has := authHdrs["grpc-timeout"]; has && len(encodedTimeout) == 1 {
+		if timeout, decodeErr := grpcutil.DecodeTimeout(encodedTimeout[0]); decodeErr != nil {
+			r.telemetry.Logger.Debug("grpc-timeout parse error", zap.Error(decodeErr))
+		} else {
+			// timeout parsed successfully
+			inflightCtx, callerCancel = context.WithTimeout(inflightCtx, timeout)
+
+			// if we return before the new goroutine is started below
+			// cancel the context.  callerCancel will be non-nil until
+			// the new goroutine is created at the end of this function.
+			defer func() {
+				if callerCancel != nil {
+					callerCancel()
+				}
+			}()
 		}
 	}
 
@@ -612,19 +643,19 @@ func (r *receiverStream) recvOne(streamCtx context.Context, serverStream anyStre
 	// immediately if there are too many waiters, or will
 	// otherwise block until timeout or enough memory becomes
 	// available.
-	err = r.boundedQueue.Acquire(inflightCtx, prevAcquiredBytes)
-	if err != nil {
-		return status.Errorf(codes.ResourceExhausted, "otel-arrow bounded queue: %v", err)
+	acquireErr := r.boundedQueue.Acquire(inflightCtx, prevAcquiredBytes)
+	if acquireErr != nil {
+		return status.Errorf(codes.ResourceExhausted, "otel-arrow bounded queue: %v", acquireErr)
 	}
 	flight.numAcquired = prevAcquiredBytes
 
-	data, numItems, uncompSize, err := r.consumeBatch(ac, req)
+	data, numItems, uncompSize, consumeErr := r.consumeBatch(ac, req)
 
-	if err != nil {
-		if errors.Is(err, arrowRecord.ErrConsumerMemoryLimit) {
-			return status.Errorf(codes.ResourceExhausted, "otel-arrow decode: %v", err)
+	if consumeErr != nil {
+		if errors.Is(consumeErr, arrowRecord.ErrConsumerMemoryLimit) {
+			return status.Errorf(codes.ResourceExhausted, "otel-arrow decode: %v", consumeErr)
 		}
-		return status.Errorf(codes.Internal, "otel-arrow decode: %v", err)
+		return status.Errorf(codes.Internal, "otel-arrow decode: %v", consumeErr)
 	}
 
 	flight.uncompSize = uncompSize
@@ -633,27 +664,35 @@ func (r *receiverStream) recvOne(streamCtx context.Context, serverStream anyStre
 	r.telemetryBuilder.OtelArrowReceiverInFlightBytes.Add(inflightCtx, uncompSize)
 	r.telemetryBuilder.OtelArrowReceiverInFlightItems.Add(inflightCtx, int64(numItems))
 
-	numAcquired, err := r.acquireAdditionalBytes(inflightCtx, prevAcquiredBytes, uncompSize, hrcv.connInfo.Addr, uncompSizeHeaderFound)
+	numAcquired, secondAcquireErr := r.acquireAdditionalBytes(inflightCtx, prevAcquiredBytes, uncompSize, hrcv.connInfo.Addr, uncompSizeHeaderFound)
 
 	flight.numAcquired = numAcquired
-	if err != nil {
-		return status.Errorf(codes.ResourceExhausted, "otel-arrow bounded queue re-acquire: %v", err)
+	if secondAcquireErr != nil {
+		return status.Errorf(codes.ResourceExhausted, "otel-arrow bounded queue re-acquire: %v", secondAcquireErr)
 	}
 
 	// Recognize that the request is still in-flight via consumeAndRespond()
 	flight.refs.Add(1)
 
 	// consumeAndRespond consumes the data and returns control to the sender loop.
-	go r.consumeAndRespond(inflightCtx, data, flight)
+	go func(callerCancel context.CancelFunc) {
+		if callerCancel != nil {
+			defer callerCancel()
+		}
+		r.consumeAndRespond(inflightCtx, streamCtx, data, flight)
+	}(callerCancel)
+
+	// Reset callerCancel so the deferred function above does not call it here.
+	callerCancel = nil
 
 	return nil
 }
 
 // consumeAndRespond finishes the span started in recvOne and logs the
 // result after invoking the pipeline to consume the data.
-func (r *Receiver) consumeAndRespond(ctx context.Context, data any, flight *inFlightData) {
+func (r *Receiver) consumeAndRespond(ctx, streamCtx context.Context, data any, flight *inFlightData) {
 	var err error
-	defer flight.consumeDone(ctx, &err)
+	defer flight.consumeDone(streamCtx, &err)
 
 	// recoverErr is a special function because it recovers panics, so we
 	// keep it in a separate defer than the processing above, which will