OTLP exporter: Let final retry error include last retryable error message

CHANGELOG.md

@@ -27,11 +27,13 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - `traceIDRatioSampler` (given by `TraceIDRatioBased(float64)`) now uses the rightmost bits for sampling decisions,
   fixing random sampling when using ID generators like `xray.IDGenerator`
   and increasing parity with other language implementations. (#3557)
+- The OTLP exporters for traces and metrics will print the final retryable error message when attempts to retry time out. (#3514)
 
 ### Deprecated
 
 - The `NewMetricExporter` in `go.opentelemetry.io/otel/bridge/opencensus` is deprecated.  Use `NewMetricProducer` instead. (#3541)
 
+
 ## [1.11.2/0.34.0] 2022-12-05
 
 ### Added

exporters/otlp/internal/retry/go.mod

@@ -5,10 +5,14 @@ go 1.18
 require (
 	github.com/cenkalti/backoff/v4 v4.2.0
 	github.com/stretchr/testify v1.8.1
+	google.golang.org/grpc v1.51.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

exporters/otlp/internal/retry/go.sum

@@ -1,19 +1,94 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4=
 github.com/cenkalti/backoff/v4 v4.2.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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exporters/otlp/internal/retry/retry.go

@@ -119,8 +119,8 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 				delay = throttle
 			}
 
-			if err := waitFunc(ctx, delay); err != nil {
-				return err
+			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
+				return fmt.Errorf("%w: %s", ctxErr, err)
 			}
 		}
 	}
@@ -129,6 +129,9 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 // Allow override for testing.
 var waitFunc = wait
 
+// wait takes the caller's context, and the amount of time to wait.  It will
+// return nil if the timer fires before or at the same time as the context's
+// deadline.  This indicates that the call can be retried.
 func wait(ctx context.Context, delay time.Duration) error {
 	timer := time.NewTimer(delay)
 	defer timer.Stop()
@@ -141,6 +144,7 @@ func wait(ctx context.Context, delay time.Duration) error {
 		select {
 		case <-timer.C:
 		default:
+			// Include the final retryable error as an explanation.
 			return ctx.Err()
 		}
 	case <-timer.C:

exporters/otlp/internal/retry/retry_test.go

@@ -32,19 +32,16 @@ func TestWait(t *testing.T) {
 		expected error
 	}{
 		{
-			ctx:      context.Background(),
-			delay:    time.Duration(0),
-			expected: nil,
+			ctx:   context.Background(),
+			delay: time.Duration(0),
 		},
 		{
-			ctx:      context.Background(),
-			delay:    time.Duration(1),
-			expected: nil,
+			ctx:   context.Background(),
+			delay: time.Duration(1),
 		},
 		{
-			ctx:      context.Background(),
-			delay:    time.Duration(-1),
-			expected: nil,
+			ctx:   context.Background(),
+			delay: time.Duration(-1),
 		},
 		{
 			ctx: func() context.Context {
@@ -59,7 +56,13 @@ func TestWait(t *testing.T) {
 	}
 
 	for _, test := range tests {
-		assert.Equal(t, test.expected, wait(test.ctx, test.delay))
+		err := wait(test.ctx, test.delay)
+		if test.expected == nil {
+			assert.NoError(t, err)
+		} else {
+			assert.Error(t, err)
+			assert.ErrorIs(t, err, test.expected)
+		}
 	}
 }
 
@@ -150,6 +153,31 @@ func TestBackoffRetry(t *testing.T) {
 	}), assert.AnError)
 }
 
+func TestBackoffRetryCanceledContext(t *testing.T) {
+	ev := func(error) (bool, time.Duration) { return true, 0 }
+
+	delay := time.Nanosecond
+	reqFunc := Config{
+		Enabled:         true,
+		InitialInterval: delay,
+		MaxInterval:     delay,
+		// Never stop retrying.
+		MaxElapsedTime: 100 * time.Microsecond,
+	}.RequestFunc(ev)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	count := 0
+	cancel()
+	err := reqFunc(ctx, func(context.Context) error {
+		count++
+		return assert.AnError
+	})
+
+	assert.ErrorIs(t, err, context.Canceled)
+	assert.Contains(t, err.Error(), assert.AnError.Error())
+	assert.Equal(t, 1, count)
+}
+
 func TestThrottledRetryGreaterThanMaxElapsedTime(t *testing.T) {
 	// Ensure the throttle delay is used by making longer than backoff delay.
 	tDelay, bDelay := time.Hour, time.Nanosecond