add errorlint linter

.golangci.yml

@@ -11,6 +11,7 @@ linters:
   enable:
     - depguard
     - errcheck
+    - errorlint
     - godot
     - gofumpt
     - goimports

baggage/baggage.go

@@ -302,7 +302,7 @@ func parseMember(member string) (Member, error) {
 	// Decode a percent-encoded value.
 	value, err := url.PathUnescape(val)
 	if err != nil {
-		return newInvalidMember(), fmt.Errorf("%w: %v", errInvalidValue, err)
+		return newInvalidMember(), fmt.Errorf("%w: %w", errInvalidValue, err)
 	}
 	return Member{key: key, value: value, properties: props, hasData: true}, nil
 }

exporters/otlp/otlplog/otlploggrpc/config.go

@@ -532,7 +532,7 @@ func loadCertificates(certPath, keyPath string) ([]tls.Certificate, error) {
 func compressorToCompression(compressor string) Compression {
 	c, err := convCompression(compressor)
 	if err != nil {
-		otel.Handle(fmt.Errorf("%s, using no compression as default", err))
+		otel.Handle(fmt.Errorf("%w, using no compression as default", err))
 		return NoCompression
 	}
 

exporters/otlp/otlplog/otlploggrpc/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/otlp/otlplog/otlploghttp/client.go

@@ -291,7 +291,10 @@ func evaluate(err error) (bool, time.Duration) {
 		return false, 0
 	}
 
-	rErr, ok := err.(retryableError)
+	// Do not use errors.As here, this should only be flattened one layer. If
+	// there are several chained errors, all the errors above it will be
+	// discarded if errors.As is used instead.
+	rErr, ok := err.(retryableError) //nolint:errorlint
 	if !ok {
 		return false, 0
 	}

exporters/otlp/otlplog/otlploghttp/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/otlp/otlpmetric/otlpmetricgrpc/exporter.go

@@ -79,7 +79,7 @@ func (e *Exporter) Export(ctx context.Context, rm *metricdata.ResourceMetrics) e
 			return fmt.Errorf("failed to upload metrics: %w", upErr)
 		}
 		// Merge the two errors.
-		return fmt.Errorf("failed to upload incomplete metrics (%s): %w", err, upErr)
+		return fmt.Errorf("failed to upload incomplete metrics (%w): %w", err, upErr)
 	}
 	return err
 }

exporters/otlp/otlpmetric/otlpmetricgrpc/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/otlp/otlpmetric/otlpmetricgrpc/internal/transform/error.go

@@ -58,7 +58,7 @@ func (e *multiErr) append(err error) {
 	// Do not use errors.As here, this should only be flattened one layer. If
 	// there is a *multiErr several steps down the chain, all the errors above
 	// it will be discarded if errors.As is used instead.
-	switch other := err.(type) {
+	switch other := err.(type) { //nolint:errorlint
 	case *multiErr:
 		// Flatten err errors into e.
 		e.errs = append(e.errs, other.errs...)

exporters/otlp/otlpmetric/otlpmetrichttp/client.go

@@ -294,7 +294,10 @@ func evaluate(err error) (bool, time.Duration) {
 		return false, 0
 	}
 
-	rErr, ok := err.(retryableError)
+	// Do not use errors.As here, this should only be flattened one layer. If
+	// there are several chained errors, all the errors above it will be
+	// discarded if errors.As is used instead.
+	rErr, ok := err.(retryableError) //nolint:errorlint
 	if !ok {
 		return false, 0
 	}

exporters/otlp/otlpmetric/otlpmetrichttp/exporter.go

@@ -79,7 +79,7 @@ func (e *Exporter) Export(ctx context.Context, rm *metricdata.ResourceMetrics) e
 			return fmt.Errorf("failed to upload metrics: %w", upErr)
 		}
 		// Merge the two errors.
-		return fmt.Errorf("failed to upload incomplete metrics (%s): %w", err, upErr)
+		return fmt.Errorf("failed to upload incomplete metrics (%w): %w", err, upErr)
 	}
 	return err
 }

exporters/otlp/otlpmetric/otlpmetrichttp/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/otlp/otlpmetric/otlpmetrichttp/internal/transform/error.go

@@ -58,7 +58,7 @@ func (e *multiErr) append(err error) {
 	// Do not use errors.As here, this should only be flattened one layer. If
 	// there is a *multiErr several steps down the chain, all the errors above
 	// it will be discarded if errors.As is used instead.
-	switch other := err.(type) {
+	switch other := err.(type) { //nolint:errorlint
 	case *multiErr:
 		// Flatten err errors into e.
 		e.errs = append(e.errs, other.errs...)

exporters/otlp/otlptrace/otlptracegrpc/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/otlp/otlptrace/otlptracehttp/client.go

@@ -316,7 +316,10 @@ func evaluate(err error) (bool, time.Duration) {
 		return false, 0
 	}
 
-	rErr, ok := err.(retryableError)
+	// Do not use errors.As here, this should only be flattened one layer. If
+	// there are several chained errors, all the errors above it will be
+	// discarded if errors.As is used instead.
+	rErr, ok := err.(retryableError) //nolint:errorlint
 	if !ok {
 		return false, 0
 	}

exporters/otlp/otlptrace/otlptracehttp/internal/retry/retry.go

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

exporters/prometheus/exporter.go

@@ -192,7 +192,7 @@ func (c *collector) Collect(ch chan<- prometheus.Metric) {
 
 		if !c.disableScopeInfo {
 			scopeInfo, err := c.scopeInfo(scopeMetrics.Scope)
-			if err == errScopeInvalid {
+			if errors.Is(err, errScopeInvalid) {
 				// Do not report the same error multiple times.
 				continue
 			}

exporters/zipkin/zipkin.go

@@ -86,7 +86,7 @@ func New(collectorURL string, opts ...Option) (*Exporter, error) {
 	}
 	u, err := url.Parse(collectorURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid collector URL %q: %v", collectorURL, err)
+		return nil, fmt.Errorf("invalid collector URL %q: %w", collectorURL, err)
 	}
 	if u.Scheme == "" || u.Host == "" {
 		return nil, fmt.Errorf("invalid collector URL %q: no scheme or host", collectorURL)

internal/shared/otlp/otlpmetric/transform/error.go.tmpl

@@ -58,7 +58,7 @@ func (e *multiErr) append(err error) {
 	// Do not use errors.As here, this should only be flattened one layer. If
 	// there is a *multiErr several steps down the chain, all the errors above
 	// it will be discarded if errors.As is used instead.
-	switch other := err.(type) {
+	switch other := err.(type) { //nolint:errorlint
 	case *multiErr:
 		// Flatten err errors into e.
 		e.errs = append(e.errs, other.errs...)

internal/shared/otlp/retry/retry.go.tmpl

@@ -112,7 +112,7 @@ func (c Config) RequestFunc(evaluate EvaluateFunc) RequestFunc {
 			}
 
 			if ctxErr := waitFunc(ctx, delay); ctxErr != nil {
-				return fmt.Errorf("%w: %s", ctxErr, err)
+				return fmt.Errorf("%w: %w", ctxErr, err)
 			}
 		}
 	}

sdk/metric/periodic_reader.go

@@ -334,7 +334,7 @@ func (r *PeriodicReader) Shutdown(ctx context.Context) error {
 		}
 
 		sErr := r.exporter.Shutdown(ctx)
-		if err == nil || err == ErrReaderShutdown {
+		if err == nil || errors.Is(err, ErrReaderShutdown) {
 			err = sErr
 		}
 

sdk/trace/batch_span_processor_test.go

@@ -329,7 +329,7 @@ func TestBatchSpanProcessorExportTimeout(t *testing.T) {
 	generateSpan(t, tr, testOption{genNumSpans: 1})
 	tp.UnregisterSpanProcessor(bsp)
 
-	if exp.err != context.DeadlineExceeded {
+	if !errors.Is(exp.err, context.DeadlineExceeded) {
 		t.Errorf("context deadline error not returned: got %+v", exp.err)
 	}
 }

sdk/trace/provider.go

@@ -291,7 +291,7 @@ func (p *TracerProvider) Shutdown(ctx context.Context) error {
 				retErr = err
 			} else {
 				// Poor man's list of errors
-				retErr = fmt.Errorf("%v; %v", retErr, err)
+				retErr = fmt.Errorf("%w; %w", retErr, err)
 			}
 		}
 	}