[processor/resourcedetection] introduce retry mechanism for detectors (…

…#37506)

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

Introduce retry mechanism for detectors.

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Fixes #34761

---------

Signed-off-by: odubajDT <ondrej.dubaj@dynatrace.com>

.chloggen/docker-resource-failure.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: processor/resourcedetection
+
+# A brief description of the change.  Surround your text with quotes ("") if it needs to start with a backtick (`).
+note: "Introduce retry logic for failed resource detection."
+
+# Mandatory: One or more tracking issues related to the change. You can use the PR number here if no issue exists.
+issues: [34761]
+
+# (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: []

exporter/datadogexporter/go.mod

@@ -178,6 +178,7 @@ require (
 	github.com/bmatcuk/doublestar/v4 v4.8.1 // indirect
 	github.com/briandowns/spinner v1.23.0 // indirect
 	github.com/cenkalti/backoff v2.2.1+incompatible // indirect
+	github.com/cenkalti/backoff/v5 v5.0.2 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575 // indirect
 	github.com/cncf/xds/go v0.0.0-20240905190251-b4127c9b8d78 // indirect

processor/resourcedetectionprocessor/go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/config v1.29.7
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.29
 	github.com/aws/aws-sdk-go-v2/service/ec2 v1.203.1
+	github.com/cenkalti/backoff/v5 v5.0.2
 	github.com/google/go-cmp v0.6.0
 	github.com/hashicorp/consul/api v1.31.2
 	github.com/open-telemetry/opentelemetry-collector-contrib/internal/aws/ecsutil v0.120.1

processor/resourcedetectionprocessor/internal/resourcedetection.go

@@ -7,11 +7,13 @@ package internal // import "github.com/open-telemetry/opentelemetry-collector-co
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"sync"
 	"time"
 
+	backoff "github.com/cenkalti/backoff/v5"
 	"go.opentelemetry.io/collector/featuregate"
 	"go.opentelemetry.io/collector/pdata/pcommon"
 	"go.opentelemetry.io/collector/processor"
@@ -120,31 +122,64 @@ func (p *ResourceProvider) Get(ctx context.Context, client *http.Client) (resour
 		var cancel context.CancelFunc
 		ctx, cancel = context.WithTimeout(ctx, client.Timeout)
 		defer cancel()
-		p.detectResource(ctx)
+		p.detectResource(ctx, client.Timeout)
 	})
 
 	return p.detectedResource.resource, p.detectedResource.schemaURL, p.detectedResource.err
 }
 
-func (p *ResourceProvider) detectResource(ctx context.Context) {
+func (p *ResourceProvider) detectResource(ctx context.Context, timeout time.Duration) {
 	p.detectedResource = &resourceResult{}
 
 	res := pcommon.NewResource()
 	mergedSchemaURL := ""
 
 	p.logger.Info("began detecting resource information")
 
-	for _, detector := range p.detectors {
-		r, schemaURL, err := detector.Detect(ctx)
-		if err != nil {
-			p.logger.Warn("failed to detect resource", zap.Error(err))
+	resultsChan := make([]chan resourceResult, len(p.detectors))
+	for i, detector := range p.detectors {
+		resultsChan[i] = make(chan resourceResult)
+		go func(detector Detector) {
+			sleep := backoff.ExponentialBackOff{
+				InitialInterval:     1 * time.Second,
+				RandomizationFactor: 1.5,
+				Multiplier:          2,
+				MaxInterval:         timeout,
+			}
+			sleep.Reset()
+			var err error
+			var r pcommon.Resource
+			var schemaURL string
+			for {
+				r, schemaURL, err = detector.Detect(ctx)
+				if err == nil {
+					resultsChan[i] <- resourceResult{resource: r, schemaURL: schemaURL, err: nil}
+					return
+				}
+				p.logger.Warn("failed to detect resource", zap.Error(err))
+
+				timer := time.NewTimer(sleep.NextBackOff())
+				select {
+				case <-timer.C:
+					fmt.Println("Retrying fetching data...")
+				case <-ctx.Done():
+					p.logger.Warn("Context was cancelled: %w", zap.Error(ctx.Err()))
+					resultsChan[i] <- resourceResult{resource: r, schemaURL: schemaURL, err: err}
+					return
+				}
+			}
+		}(detector)
+	}
+
+	for _, ch := range resultsChan {
+		result := <-ch
+		if result.err != nil {
 			if allowErrorPropagationFeatureGate.IsEnabled() {
-				p.detectedResource.err = err
-				return
+				p.detectedResource.err = errors.Join(p.detectedResource.err, result.err)
 			}
 		} else {
-			mergedSchemaURL = MergeSchemaURL(mergedSchemaURL, schemaURL)
-			MergeResource(res, r, false)
+			mergedSchemaURL = MergeSchemaURL(mergedSchemaURL, result.schemaURL)
+			MergeResource(res, result.resource, false)
 		}
 	}
 

processor/resourcedetectionprocessor/internal/resourcedetection_test.go

@@ -107,7 +107,7 @@ func TestDetect(t *testing.T) {
 			p, err := f.CreateResourceProvider(processortest.NewNopSettings(metadata.Type), time.Second, tt.attributes, &mockDetectorConfig{}, mockDetectorTypes...)
 			require.NoError(t, err)
 
-			got, _, err := p.Get(context.Background(), http.DefaultClient)
+			got, _, err := p.Get(context.Background(), &http.Client{Timeout: 10 * time.Second})
 			require.NoError(t, err)
 
 			assert.Equal(t, tt.expectedResource, got.Attributes().AsRaw())
@@ -133,38 +133,46 @@ func TestDetectResource_DetectorFactoryError(t *testing.T) {
 	require.EqualError(t, err, fmt.Sprintf("failed creating detector type %q: %v", mockDetectorKey, "creation failed"))
 }
 
-func TestDetectResource_Error(t *testing.T) {
-	md1 := &MockDetector{}
-	res := pcommon.NewResource()
-	require.NoError(t, res.Attributes().FromRaw(map[string]any{"a": "1", "b": "2"}))
-	md1.On("Detect").Return(res, nil)
-
-	md2 := &MockDetector{}
-	md2.On("Detect").Return(pcommon.NewResource(), errors.New("err1"))
-
-	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2)
-	_, _, err := p.Get(context.Background(), http.DefaultClient)
-	require.NoError(t, err)
-}
-
-func TestDetectResource_Error_PropagationEnabled(t *testing.T) {
+func TestDetectResource_Error_ContextDeadline_WithErrPropagation(t *testing.T) {
 	err := featuregate.GlobalRegistry().Set(allowErrorPropagationFeatureGate.ID(), true)
 	assert.NoError(t, err)
 	defer func() {
 		_ = featuregate.GlobalRegistry().Set(allowErrorPropagationFeatureGate.ID(), false)
 	}()
 
 	md1 := &MockDetector{}
-	res := pcommon.NewResource()
-	require.NoError(t, res.Attributes().FromRaw(map[string]any{"a": "1", "b": "2"}))
-	md1.On("Detect").Return(res, nil)
+	md1.On("Detect").Return(pcommon.NewResource(), fmt.Errorf("err1"))
 
 	md2 := &MockDetector{}
-	md2.On("Detect").Return(pcommon.NewResource(), errors.New("err1"))
+	md2.On("Detect").Return(pcommon.NewResource(), errors.New("err2"))
 
 	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2)
-	_, _, err = p.Get(context.Background(), http.DefaultClient)
+
+	var cancel context.CancelFunc
+	ctx, cancel := context.WithTimeout(context.TODO(), 3*time.Second)
+	defer cancel()
+
+	_, _, err = p.Get(ctx, &http.Client{Timeout: 10 * time.Second})
 	require.Error(t, err)
+	require.Contains(t, err.Error(), "err1")
+	require.Contains(t, err.Error(), "err2")
+}
+
+func TestDetectResource_Error_ContextDeadline_WithoutErrPropagation(t *testing.T) {
+	md1 := &MockDetector{}
+	md1.On("Detect").Return(pcommon.NewResource(), fmt.Errorf("err1"))
+
+	md2 := &MockDetector{}
+	md2.On("Detect").Return(pcommon.NewResource(), errors.New("err2"))
+
+	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2)
+
+	var cancel context.CancelFunc
+	ctx, cancel := context.WithTimeout(context.TODO(), 3*time.Second)
+	defer cancel()
+
+	_, _, err := p.Get(ctx, &http.Client{Timeout: 10 * time.Second})
+	require.NoError(t, err)
 }
 
 func TestMergeResource(t *testing.T) {
@@ -230,20 +238,17 @@ func TestDetectResource_Parallel(t *testing.T) {
 	require.NoError(t, res2.Attributes().FromRaw(map[string]any{"a": "11", "c": "3"}))
 	md2.On("Detect").Return(res2, nil)
 
-	md3 := NewMockParallelDetector()
-	md3.On("Detect").Return(pcommon.NewResource(), errors.New("an error"))
-
 	expectedResourceAttrs := map[string]any{"a": "1", "b": "2", "c": "3"}
 
-	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2, md3)
+	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2)
 
 	// call p.Get multiple times
 	wg := &sync.WaitGroup{}
 	wg.Add(iterations)
 	for i := 0; i < iterations; i++ {
 		go func() {
 			defer wg.Done()
-			detected, _, err := p.Get(context.Background(), http.DefaultClient)
+			detected, _, err := p.Get(context.Background(), &http.Client{Timeout: 10 * time.Second})
 			assert.NoError(t, err)
 			assert.Equal(t, expectedResourceAttrs, detected.Attributes().AsRaw())
 		}()
@@ -255,13 +260,36 @@ func TestDetectResource_Parallel(t *testing.T) {
 	// detector.Detect should only be called once, so we only need to notify each channel once
 	md1.ch <- struct{}{}
 	md2.ch <- struct{}{}
-	md3.ch <- struct{}{}
 
 	// then wait until all goroutines are finished, and ensure p.Detect was only called once
 	wg.Wait()
 	md1.AssertNumberOfCalls(t, "Detect", 1)
 	md2.AssertNumberOfCalls(t, "Detect", 1)
-	md3.AssertNumberOfCalls(t, "Detect", 1)
+}
+
+func TestDetectResource_Reconnect(t *testing.T) {
+	md1 := &MockDetector{}
+	res1 := pcommon.NewResource()
+	require.NoError(t, res1.Attributes().FromRaw(map[string]any{"a": "1", "b": "2"}))
+	md1.On("Detect").Return(pcommon.NewResource(), errors.New("connection error1")).Twice()
+	md1.On("Detect").Return(res1, nil)
+
+	md2 := &MockDetector{}
+	res2 := pcommon.NewResource()
+	require.NoError(t, res2.Attributes().FromRaw(map[string]any{"c": "3"}))
+	md2.On("Detect").Return(pcommon.NewResource(), errors.New("connection error2")).Once()
+	md2.On("Detect").Return(res2, nil)
+
+	expectedResourceAttrs := map[string]any{"a": "1", "b": "2", "c": "3"}
+
+	p := NewResourceProvider(zap.NewNop(), time.Second, nil, md1, md2)
+
+	detected, _, err := p.Get(context.Background(), &http.Client{Timeout: 15 * time.Second})
+	assert.NoError(t, err)
+	assert.Equal(t, expectedResourceAttrs, detected.Attributes().AsRaw())
+
+	md1.AssertNumberOfCalls(t, "Detect", 3) // 2 errors + 1 success
+	md2.AssertNumberOfCalls(t, "Detect", 2) // 1 error + 1 success
 }
 
 func TestFilterAttributes_Match(t *testing.T) {