Use gofumpt instead of gofmt

.golangci.yml

@@ -12,7 +12,7 @@ linters:
     - depguard
     - errcheck
     - godot
-    - gofmt
+    - gofumpt
     - goimports
     - gosimple
     - govet

attribute/key_test.go

@@ -41,7 +41,7 @@ func TestDefined(t *testing.T) {
 		},
 	} {
 		t.Run(testcase.name, func(t *testing.T) {
-			//func (k attribute.Key) Defined() bool {
+			// func (k attribute.Key) Defined() bool {
 			have := testcase.k.Defined()
 			if have != testcase.want {
 				t.Errorf("Want: %v, but have: %v", testcase.want, have)
@@ -91,7 +91,7 @@ func TestEmit(t *testing.T) {
 		},
 	} {
 		t.Run(testcase.name, func(t *testing.T) {
-			//proto: func (v attribute.Value) Emit() string {
+			// proto: func (v attribute.Value) Emit() string {
 			have := testcase.v.Emit()
 			if have != testcase.want {
 				t.Errorf("Want: %s, but have: %s", testcase.want, have)

bridge/opencensus/internal/ocmetric/metric_test.go

@@ -56,7 +56,6 @@ func TestConvertMetrics(t *testing.T) {
 					},
 					TimeSeries: []*ocmetricdata.TimeSeries{
 						{
-
 							LabelValues: []ocmetricdata.LabelValue{
 								{
 									Value:   "hello",
@@ -370,7 +369,8 @@ func TestConvertMetrics(t *testing.T) {
 					},
 				},
 			},
-		}, {
+		},
+		{
 			desc: "histogram without data points",
 			input: []*ocmetricdata.Metric{
 				{
@@ -393,7 +393,8 @@ func TestConvertMetrics(t *testing.T) {
 					},
 				},
 			},
-		}, {
+		},
+		{
 			desc: "sum without data points",
 			input: []*ocmetricdata.Metric{
 				{
@@ -417,7 +418,8 @@ func TestConvertMetrics(t *testing.T) {
 					},
 				},
 			},
-		}, {
+		},
+		{
 			desc: "gauge without data points",
 			input: []*ocmetricdata.Metric{
 				{
@@ -439,7 +441,8 @@ func TestConvertMetrics(t *testing.T) {
 					},
 				},
 			},
-		}, {
+		},
+		{
 			desc: "histogram with negative count",
 			input: []*ocmetricdata.Metric{
 				{
@@ -462,7 +465,8 @@ func TestConvertMetrics(t *testing.T) {
 				},
 			},
 			expectedErr: errNegativeDistributionCount,
-		}, {
+		},
+		{
 			desc: "histogram with negative bucket count",
 			input: []*ocmetricdata.Metric{
 				{
@@ -489,7 +493,8 @@ func TestConvertMetrics(t *testing.T) {
 				},
 			},
 			expectedErr: errNegativeBucketCount,
-		}, {
+		},
+		{
 			desc: "histogram with non-histogram datapoint type",
 			input: []*ocmetricdata.Metric{
 				{
@@ -510,7 +515,8 @@ func TestConvertMetrics(t *testing.T) {
 				},
 			},
 			expectedErr: errMismatchedValueTypes,
-		}, {
+		},
+		{
 			desc: "sum with non-sum datapoint type",
 			input: []*ocmetricdata.Metric{
 				{
@@ -531,7 +537,8 @@ func TestConvertMetrics(t *testing.T) {
 				},
 			},
 			expectedErr: errMismatchedValueTypes,
-		}, {
+		},
+		{
 			desc: "gauge with non-gauge datapoint type",
 			input: []*ocmetricdata.Metric{
 				{
@@ -552,7 +559,8 @@ func TestConvertMetrics(t *testing.T) {
 				},
 			},
 			expectedErr: errMismatchedValueTypes,
-		}, {
+		},
+		{
 			desc: "unsupported Gauge Distribution type",
 			input: []*ocmetricdata.Metric{
 				{

bridge/opentracing/bridge.go

@@ -317,8 +317,10 @@ type BridgeTracer struct {
 	propagator propagation.TextMapPropagator
 }
 
-var _ ot.Tracer = &BridgeTracer{}
-var _ ot.TracerContextWithSpanExtension = &BridgeTracer{}
+var (
+	_ ot.Tracer                         = &BridgeTracer{}
+	_ ot.TracerContextWithSpanExtension = &BridgeTracer{}
+)
 
 // NewBridgeTracer creates a new BridgeTracer. The new tracer forwards
 // the calls to the OpenTelemetry Noop tracer, so it should be
@@ -829,15 +831,13 @@ func newTextMapWrapperForInject(carrier interface{}) (*textMapWrapper, error) {
 	return t, nil
 }
 
-type textMapWriter struct {
-}
+type textMapWriter struct{}
 
 func (t *textMapWriter) Set(key string, value string) {
 	// maybe print a warning log.
 }
 
-type textMapReader struct {
-}
+type textMapReader struct{}
 
 func (t *textMapReader) ForeachKey(handler func(key, val string) error) error {
 	return nil // maybe print a warning log.

bridge/opentracing/bridge_test.go

@@ -35,8 +35,7 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
-type testOnlyTextMapReader struct {
-}
+type testOnlyTextMapReader struct{}
 
 func newTestOnlyTextMapReader() *testOnlyTextMapReader {
 	return &testOnlyTextMapReader{}
@@ -144,8 +143,7 @@ var (
 	spanID     trace.SpanID  = [8]byte{byte(11)}
 )
 
-type testTextMapPropagator struct {
-}
+type testTextMapPropagator struct{}
 
 func (t testTextMapPropagator) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {
 	carrier.Set(testHeader, strings.Join([]string{traceID.String(), spanID.String()}, ":"))
@@ -163,7 +161,7 @@ func (t testTextMapPropagator) Extract(ctx context.Context, carrier propagation.
 		return ctx
 	}
 
-	var exist = false
+	exist := false
 
 	for _, key := range carrier.Keys() {
 		if strings.EqualFold(testHeader, key) {

bridge/opentracing/internal/mock.go

@@ -54,8 +54,10 @@ type MockTracer struct {
 	rand     *rand.Rand
 }
 
-var _ trace.Tracer = &MockTracer{}
-var _ migration.DeferredContextSetupTracerExtension = &MockTracer{}
+var (
+	_ trace.Tracer                                  = &MockTracer{}
+	_ migration.DeferredContextSetupTracerExtension = &MockTracer{}
+)
 
 func NewMockTracer() *MockTracer {
 	return &MockTracer{
@@ -195,8 +197,10 @@ type MockSpan struct {
 	Events       []MockEvent
 }
 
-var _ trace.Span = &MockSpan{}
-var _ migration.OverrideTracerSpanExtension = &MockSpan{}
+var (
+	_ trace.Span                            = &MockSpan{}
+	_ migration.OverrideTracerSpanExtension = &MockSpan{}
+)
 
 func (s *MockSpan) SpanContext() trace.SpanContext {
 	return s.spanContext

bridge/opentracing/test/bridge_grpc_test.go

@@ -38,12 +38,15 @@ type testGRPCServer struct{}
 func (*testGRPCServer) UnaryCall(ctx context.Context, r *testpb.SimpleRequest) (*testpb.SimpleResponse, error) {
 	return &testpb.SimpleResponse{Payload: r.Payload * 2}, nil
 }
+
 func (*testGRPCServer) StreamingOutputCall(*testpb.SimpleRequest, testpb.TestService_StreamingOutputCallServer) error {
 	return nil
 }
+
 func (*testGRPCServer) StreamingInputCall(testpb.TestService_StreamingInputCallServer) error {
 	return nil
 }
+
 func (*testGRPCServer) StreamingBidirectionalCall(testpb.TestService_StreamingBidirectionalCallServer) error {
 	return nil
 }

bridge/opentracing/wrapper.go

@@ -60,8 +60,10 @@ type WrapperTracer struct {
 	tracer trace.Tracer
 }
 
-var _ trace.Tracer = &WrapperTracer{}
-var _ migration.DeferredContextSetupTracerExtension = &WrapperTracer{}
+var (
+	_ trace.Tracer                                  = &WrapperTracer{}
+	_ migration.DeferredContextSetupTracerExtension = &WrapperTracer{}
+)
 
 // NewWrapperTracer wraps the passed tracer and also talks to the
 // passed bridge tracer when setting up the context with the new

example/namedtracer/foo/foo.go

@@ -22,9 +22,7 @@ import (
 	"go.opentelemetry.io/otel/trace"
 )
 
-var (
-	lemonsKey = attribute.Key("ex.com/lemons")
-)
+var lemonsKey = attribute.Key("ex.com/lemons")
 
 // SubOperation is an example to demonstrate the use of named tracer.
 // It creates a named tracer with its package path.

exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go

@@ -136,9 +136,11 @@ type clientShim struct {
 func (clientShim) Temporality(metric.InstrumentKind) metricdata.Temporality {
 	return metricdata.CumulativeTemporality
 }
+
 func (clientShim) Aggregation(metric.InstrumentKind) metric.Aggregation {
 	return nil
 }
+
 func (clientShim) ForceFlush(ctx context.Context) error {
 	return ctx.Err()
 }

exporters/otlp/otlpmetric/otlpmetricgrpc/internal/oconf/options_test.go

@@ -203,7 +203,7 @@ func TestConfigs(t *testing.T) {
 			},
 			asserts: func(t *testing.T, c *Config, grpcOption bool) {
 				if grpcOption {
-					//TODO: make sure gRPC's credentials actually works
+					// TODO: make sure gRPC's credentials actually works
 					assert.NotNil(t, c.Metrics.GRPCCredentials)
 				} else {
 					// nolint:staticcheck // ignoring tlsCert.RootCAs.Subjects is deprecated ERR because cert does not come from SystemCertPool.

exporters/otlp/otlpmetric/otlpmetricgrpc/internal/otest/client.go

@@ -38,7 +38,7 @@ import (
 
 var (
 	// Sat Jan 01 2000 00:00:00 GMT+0000.
-	start = time.Date(2000, time.January, 01, 0, 0, 0, 0, time.FixedZone("GMT", 0))
+	start = time.Date(2000, time.January, 0o1, 0, 0, 0, 0, time.FixedZone("GMT", 0))
 	end   = start.Add(30 * time.Second)
 
 	kvAlice = &cpb.KeyValue{Key: "user", Value: &cpb.AnyValue{

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

@@ -40,7 +40,7 @@ type unknownAggT struct {
 
 var (
 	// Sat Jan 01 2000 00:00:00 GMT+0000.
-	start = time.Date(2000, time.January, 01, 0, 0, 0, 0, time.FixedZone("GMT", 0))
+	start = time.Date(2000, time.January, 0o1, 0, 0, 0, 0, time.FixedZone("GMT", 0))
 	end   = start.Add(30 * time.Second)
 
 	alice = attribute.NewSet(attribute.String("user", "alice"))

exporters/otlp/otlpmetric/otlpmetrichttp/client_test.go

@@ -40,9 +40,11 @@ type clientShim struct {
 func (clientShim) Temporality(metric.InstrumentKind) metricdata.Temporality {
 	return metricdata.CumulativeTemporality
 }
+
 func (clientShim) Aggregation(metric.InstrumentKind) metric.Aggregation {
 	return nil
 }
+
 func (clientShim) ForceFlush(ctx context.Context) error {
 	return ctx.Err()
 }

exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf/options_test.go

@@ -203,7 +203,7 @@ func TestConfigs(t *testing.T) {
 			},
 			asserts: func(t *testing.T, c *Config, grpcOption bool) {
 				if grpcOption {
-					//TODO: make sure gRPC's credentials actually works
+					// TODO: make sure gRPC's credentials actually works
 					assert.NotNil(t, c.Metrics.GRPCCredentials)
 				} else {
 					// nolint:staticcheck // ignoring tlsCert.RootCAs.Subjects is deprecated ERR because cert does not come from SystemCertPool.

exporters/otlp/otlpmetric/otlpmetrichttp/internal/otest/client.go

@@ -38,7 +38,7 @@ import (
 
 var (
 	// Sat Jan 01 2000 00:00:00 GMT+0000.
-	start = time.Date(2000, time.January, 01, 0, 0, 0, 0, time.FixedZone("GMT", 0))
+	start = time.Date(2000, time.January, 0o1, 0, 0, 0, 0, time.FixedZone("GMT", 0))
 	end   = start.Add(30 * time.Second)
 
 	kvAlice = &cpb.KeyValue{Key: "user", Value: &cpb.AnyValue{

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

@@ -40,7 +40,7 @@ type unknownAggT struct {
 
 var (
 	// Sat Jan 01 2000 00:00:00 GMT+0000.
-	start = time.Date(2000, time.January, 01, 0, 0, 0, 0, time.FixedZone("GMT", 0))
+	start = time.Date(2000, time.January, 0o1, 0, 0, 0, 0, time.FixedZone("GMT", 0))
 	end   = start.Add(30 * time.Second)
 
 	alice = attribute.NewSet(attribute.String("user", "alice"))

exporters/otlp/otlptrace/exporter.go

@@ -24,9 +24,7 @@ import (
 	tracesdk "go.opentelemetry.io/otel/sdk/trace"
 )
 
-var (
-	errAlreadyStarted = errors.New("already started")
-)
+var errAlreadyStarted = errors.New("already started")
 
 // Exporter exports trace data in the OTLP wire format.
 type Exporter struct {
@@ -55,7 +53,7 @@ func (e *Exporter) ExportSpans(ctx context.Context, ss []tracesdk.ReadOnlySpan)
 
 // Start establishes a connection to the receiving endpoint.
 func (e *Exporter) Start(ctx context.Context) error {
-	var err = errAlreadyStarted
+	err := errAlreadyStarted
 	e.startOnce.Do(func() {
 		e.mu.Lock()
 		e.started = true

exporters/otlp/otlptrace/internal/tracetransform/span_test.go

@@ -213,12 +213,14 @@ func TestSpanData(t *testing.T) {
 		StartTime: startTime,
 		EndTime:   endTime,
 		Events: []tracesdk.Event{
-			{Time: startTime,
+			{
+				Time: startTime,
 				Attributes: []attribute.KeyValue{
 					attribute.Int64("CompressedByteSize", 512),
 				},
 			},
-			{Time: endTime,
+			{
+				Time: endTime,
 				Attributes: []attribute.KeyValue{
 					attribute.String("EventType", "Recv"),
 				},

exporters/otlp/otlptrace/otlptracegrpc/internal/otlpconfig/options_test.go

@@ -201,7 +201,7 @@ func TestConfigs(t *testing.T) {
 			},
 			asserts: func(t *testing.T, c *Config, grpcOption bool) {
 				if grpcOption {
-					//TODO: make sure gRPC's credentials actually works
+					// TODO: make sure gRPC's credentials actually works
 					assert.NotNil(t, c.Traces.GRPCCredentials)
 				} else {
 					// nolint:staticcheck // ignoring tlsCert.RootCAs.Subjects is deprecated ERR because cert does not come from SystemCertPool.

exporters/otlp/otlptrace/otlptracehttp/example_test.go

@@ -32,12 +32,10 @@ const (
 	instrumentationVersion = "0.1.0"
 )
 
-var (
-	tracer = otel.GetTracerProvider().Tracer(
-		instrumentationName,
-		trace.WithInstrumentationVersion(instrumentationVersion),
-		trace.WithSchemaURL(semconv.SchemaURL),
-	)
+var tracer = otel.GetTracerProvider().Tracer(
+	instrumentationName,
+	trace.WithInstrumentationVersion(instrumentationVersion),
+	trace.WithSchemaURL(semconv.SchemaURL),
 )
 
 func add(ctx context.Context, x, y int64) int64 {