Add godot linter to golangci (#2845)

Comment should be complete sentences outside of lists with sentence
fragments. This adds the godot linter to check these complete sentences
end with punctuation. If they do not, running fix will append a period.

.golangci.yml

@@ -15,6 +15,7 @@ linters:
     - goimports
     - gosimple
     - govet
+    - godot
     - ineffassign
     - misspell
     - revive
@@ -45,3 +46,9 @@ linters-settings:
       - cancelled
   goimports:
     local-prefixes: go.opentelemetry.io
+  godot:
+    exclude:
+      # Exclude sentence fragments for lists.
+      - '^[ ]*[-•]'
+      # Exclude sentences prefixing a list.
+      - ':$'

bridge/opencensus/exporter.go

@@ -40,7 +40,7 @@ import (
 var errConversion = errors.New("Unable to convert from OpenCensus to OpenTelemetry")
 
 // NewMetricExporter returns an OpenCensus exporter that exports to an
-// OpenTelemetry exporter
+// OpenTelemetry exporter.
 func NewMetricExporter(base export.Exporter) metricexport.Exporter {
 	return &exporter{base: base}
 }
@@ -51,7 +51,7 @@ type exporter struct {
 	base export.Exporter
 }
 
-// ExportMetrics implements the OpenCensus metric Exporter interface
+// ExportMetrics implements the OpenCensus metric Exporter interface.
 func (e *exporter) ExportMetrics(ctx context.Context, metrics []*metricdata.Metric) error {
 	res := resource.Empty()
 	if len(metrics) != 0 {
@@ -147,7 +147,7 @@ func convertResource(res *ocresource.Resource) *resource.Resource {
 	return resource.NewSchemaless(attrs...)
 }
 
-// convertDescriptor converts an OpenCensus Descriptor to an OpenTelemetry Descriptor
+// convertDescriptor converts an OpenCensus Descriptor to an OpenTelemetry Descriptor.
 func convertDescriptor(ocDescriptor metricdata.Descriptor) (sdkapi.Descriptor, error) {
 	var (
 		nkind number.Kind

example/opencensus/main.go

@@ -40,7 +40,7 @@ import (
 var (
 	// instrumenttype differentiates between our gauge and view metrics.
 	keyType = tag.MustNewKey("instrumenttype")
-	// Counts the number of lines read in from standard input
+	// Counts the number of lines read in from standard input.
 	countMeasure = stats.Int64("test_count", "A count of something", stats.UnitDimensionless)
 	countView    = &view.View{
 		Name:        "test_count",

example/passthrough/handler/handler.go

@@ -44,7 +44,7 @@ func New(next func(r *http.Request)) *Handler {
 	}
 }
 
-// HandleHTTPReq mimics what an instrumented http server does
+// HandleHTTPReq mimics what an instrumented http server does.
 func (h *Handler) HandleHTTPReq(r *http.Request) {
 	ctx := h.propagators.Extract(r.Context(), propagation.HeaderCarrier(r.Header))
 	var span trace.Span
@@ -58,7 +58,7 @@ func (h *Handler) HandleHTTPReq(r *http.Request) {
 	h.makeOutgoingRequest(ctx)
 }
 
-// makeOutgoingRequest mimics what an instrumented http client does
+// makeOutgoingRequest mimics what an instrumented http client does.
 func (h *Handler) makeOutgoingRequest(ctx context.Context) {
 	// make a new http request
 	r, err := http.NewRequest("", "", nil)

example/passthrough/main.go

@@ -73,7 +73,7 @@ func initPassthroughGlobals() {
 }
 
 // nonGlobalTracer creates a trace provider instance for testing, but doesn't
-// set it as the global tracer provider
+// set it as the global tracer provider.
 func nonGlobalTracer() *sdktrace.TracerProvider {
 	var err error
 	exp, err := stdouttrace.New(stdouttrace.WithPrettyPrint())

exporters/jaeger/agent.go

@@ -29,7 +29,7 @@ import (
 )
 
 const (
-	// udpPacketMaxLength is the max size of UDP packet we want to send, synced with jaeger-agent
+	// udpPacketMaxLength is the max size of UDP packet we want to send, synced with jaeger-agent.
 	udpPacketMaxLength = 65000
 	// emitBatchOverhead is the additional overhead bytes used for enveloping the datagram,
 	// synced with jaeger-agent https://github.com/jaegertracing/jaeger-client-go/blob/master/transport_udp.go#L37

exporters/jaeger/env.go

@@ -18,13 +18,13 @@ import (
 	"os"
 )
 
-// Environment variable names
+// Environment variable names.
 const (
 	// Hostname for the Jaeger agent, part of address where exporter sends spans
-	// i.e.	"localhost"
+	// i.e.	"localhost".
 	envAgentHost = "OTEL_EXPORTER_JAEGER_AGENT_HOST"
 	// Port for the Jaeger agent, part of address where exporter sends spans
-	// i.e. 6831
+	// i.e. 6831.
 	envAgentPort = "OTEL_EXPORTER_JAEGER_AGENT_PORT"
 	// The HTTP endpoint for sending spans directly to a collector,
 	// i.e. http://jaeger-collector:14268/api/traces.
@@ -35,7 +35,7 @@ const (
 	envPassword = "OTEL_EXPORTER_JAEGER_PASSWORD"
 )
 
-// envOr returns an env variable's value if it is exists or the default if not
+// envOr returns an env variable's value if it is exists or the default if not.
 func envOr(key, defaultValue string) string {
 	if v, ok := os.LookupEnv(key); ok && v != "" {
 		return v

exporters/jaeger/reconnecting_udp_client.go

@@ -134,7 +134,7 @@ func (c *reconnectingUDPConn) attemptDialNewAddr(newAddr *net.UDPAddr) error {
 	return nil
 }
 
-// Write calls net.udpConn.Write, if it fails an attempt is made to connect to a new addr, if that succeeds the write is retried before returning
+// Write calls net.udpConn.Write, if it fails an attempt is made to connect to a new addr, if that succeeds the write is retried before returning.
 func (c *reconnectingUDPConn) Write(b []byte) (int, error) {
 	var bytesWritten int
 	var err error
@@ -167,7 +167,7 @@ func (c *reconnectingUDPConn) Write(b []byte) (int, error) {
 	return bytesWritten, err
 }
 
-// Close stops the reconnectLoop, then closes the connection via net.udpConn 's implementation
+// Close stops the reconnectLoop, then closes the connection via net.udpConn 's implementation.
 func (c *reconnectingUDPConn) Close() error {
 	close(c.closeChan)
 
@@ -183,7 +183,7 @@ func (c *reconnectingUDPConn) Close() error {
 }
 
 // SetWriteBuffer defers to the net.udpConn SetWriteBuffer implementation wrapped with a RLock. if no conn is currently held
-// and SetWriteBuffer is called store bufferBytes to be set for new conns
+// and SetWriteBuffer is called store bufferBytes to be set for new conns.
 func (c *reconnectingUDPConn) SetWriteBuffer(bytes int) error {
 	var err error
 

exporters/jaeger/uploader.go

@@ -28,7 +28,7 @@ import (
 	"go.opentelemetry.io/otel/exporters/jaeger/internal/third_party/thrift/lib/go/thrift"
 )
 
-// batchUploader send a batch of spans to Jaeger
+// batchUploader send a batch of spans to Jaeger.
 type batchUploader interface {
 	upload(context.Context, *gen.Batch) error
 	shutdown(context.Context) error

exporters/otlp/internal/envconfig/envconfig.go

@@ -25,17 +25,17 @@ import (
 	"time"
 )
 
-// ConfigFn is the generic function used to set a config
+// ConfigFn is the generic function used to set a config.
 type ConfigFn func(*EnvOptionsReader)
 
-// EnvOptionsReader reads the required environment variables
+// EnvOptionsReader reads the required environment variables.
 type EnvOptionsReader struct {
 	GetEnv    func(string) string
 	ReadFile  func(string) ([]byte, error)
 	Namespace string
 }
 
-// Apply runs every ConfigFn
+// Apply runs every ConfigFn.
 func (e *EnvOptionsReader) Apply(opts ...ConfigFn) {
 	for _, o := range opts {
 		o(e)
@@ -50,7 +50,7 @@ func (e *EnvOptionsReader) GetEnvValue(key string) (string, bool) {
 	return v, v != ""
 }
 
-// WithString retrieves the specified config and passes it to ConfigFn as a string
+// WithString retrieves the specified config and passes it to ConfigFn as a string.
 func WithString(n string, fn func(string)) func(e *EnvOptionsReader) {
 	return func(e *EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {
@@ -59,7 +59,7 @@ func WithString(n string, fn func(string)) func(e *EnvOptionsReader) {
 	}
 }
 
-// WithDuration retrieves the specified config and passes it to ConfigFn as a duration
+// WithDuration retrieves the specified config and passes it to ConfigFn as a duration.
 func WithDuration(n string, fn func(time.Duration)) func(e *EnvOptionsReader) {
 	return func(e *EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {
@@ -70,7 +70,7 @@ func WithDuration(n string, fn func(time.Duration)) func(e *EnvOptionsReader) {
 	}
 }
 
-// WithHeaders retrieves the specified config and passes it to ConfigFn as a map of HTTP headers
+// WithHeaders retrieves the specified config and passes it to ConfigFn as a map of HTTP headers.
 func WithHeaders(n string, fn func(map[string]string)) func(e *EnvOptionsReader) {
 	return func(e *EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {
@@ -79,7 +79,7 @@ func WithHeaders(n string, fn func(map[string]string)) func(e *EnvOptionsReader)
 	}
 }
 
-// WithURL retrieves the specified config and passes it to ConfigFn as a net/url.URL
+// WithURL retrieves the specified config and passes it to ConfigFn as a net/url.URL.
 func WithURL(n string, fn func(*url.URL)) func(e *EnvOptionsReader) {
 	return func(e *EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {
@@ -90,7 +90,7 @@ func WithURL(n string, fn func(*url.URL)) func(e *EnvOptionsReader) {
 	}
 }
 
-// WithTLSConfig retrieves the specified config and passes it to ConfigFn as a crypto/tls.Config
+// WithTLSConfig retrieves the specified config and passes it to ConfigFn as a crypto/tls.Config.
 func WithTLSConfig(n string, fn func(*tls.Config)) func(e *EnvOptionsReader) {
 	return func(e *EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {

exporters/otlp/otlpmetric/internal/metrictransform/metric.go

@@ -40,7 +40,7 @@ var (
 
 	// ErrIncompatibleAgg is returned when
 	// aggregation.Kind implies an interface conversion that has
-	// failed
+	// failed.
 	ErrIncompatibleAgg = errors.New("incompatible aggregation type")
 
 	// ErrUnknownValueType is returned when a transformation of an unknown value

exporters/otlp/otlpmetric/internal/otlpconfig/envconfig.go

@@ -26,14 +26,14 @@ import (
 	"go.opentelemetry.io/otel/exporters/otlp/internal/envconfig"
 )
 
-// DefaultEnvOptionsReader is the default environments reader
+// DefaultEnvOptionsReader is the default environments reader.
 var DefaultEnvOptionsReader = envconfig.EnvOptionsReader{
 	GetEnv:    os.Getenv,
 	ReadFile:  ioutil.ReadFile,
 	Namespace: "OTEL_EXPORTER_OTLP",
 }
 
-// ApplyGRPCEnvConfigs applies the env configurations for gRPC
+// ApplyGRPCEnvConfigs applies the env configurations for gRPC.
 func ApplyGRPCEnvConfigs(cfg Config) Config {
 	opts := getOptionsFromEnv()
 	for _, opt := range opts {
@@ -42,7 +42,7 @@ func ApplyGRPCEnvConfigs(cfg Config) Config {
 	return cfg
 }
 
-// ApplyHTTPEnvConfigs applies the env configurations for HTTP
+// ApplyHTTPEnvConfigs applies the env configurations for HTTP.
 func ApplyHTTPEnvConfigs(cfg Config) Config {
 	opts := getOptionsFromEnv()
 	for _, opt := range opts {
@@ -104,7 +104,7 @@ func withEndpointForGRPC(u *url.URL) func(cfg Config) Config {
 	}
 }
 
-// WithEnvCompression retrieves the specified config and passes it to ConfigFn as a Compression
+// WithEnvCompression retrieves the specified config and passes it to ConfigFn as a Compression.
 func WithEnvCompression(n string, fn func(Compression)) func(e *envconfig.EnvOptionsReader) {
 	return func(e *envconfig.EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {

exporters/otlp/otlpmetric/otlpmetricgrpc/client_test.go

@@ -163,7 +163,7 @@ func TestNewExporterInvokeStartThenStopManyTimes(t *testing.T) {
 	}
 }
 
-// This test takes a long time to run: to skip it, run tests using: -short
+// This test takes a long time to run: to skip it, run tests using: -short.
 func TestNewExporterCollectorOnBadConnection(t *testing.T) {
 	if testing.Short() {
 		t.Skipf("Skipping this long running test")

exporters/otlp/otlpmetric/otlpmetricgrpc/mock_collector_test.go

@@ -139,7 +139,7 @@ func (mc *mockCollector) GetMetrics() []*metricpb.Metric {
 	return mc.getMetrics()
 }
 
-// runMockCollector is a helper function to create a mock Collector
+// runMockCollector is a helper function to create a mock Collector.
 func runMockCollector(t *testing.T) *mockCollector {
 	return runMockCollectorAtEndpoint(t, "localhost:0")
 }

exporters/otlp/otlpmetric/otlpmetrichttp/client.go

@@ -98,7 +98,7 @@ func NewClient(opts ...Option) otlpmetric.Client {
 	}
 }
 
-// Start does nothing in a HTTP client
+// Start does nothing in a HTTP client.
 func (d *client) Start(ctx context.Context) error {
 	// nothing to do
 	select {

exporters/otlp/otlptrace/internal/otlpconfig/envconfig.go

@@ -26,14 +26,14 @@ import (
 	"go.opentelemetry.io/otel/exporters/otlp/internal/envconfig"
 )
 
-// DefaultEnvOptionsReader is the default environments reader
+// DefaultEnvOptionsReader is the default environments reader.
 var DefaultEnvOptionsReader = envconfig.EnvOptionsReader{
 	GetEnv:    os.Getenv,
 	ReadFile:  ioutil.ReadFile,
 	Namespace: "OTEL_EXPORTER_OTLP",
 }
 
-// ApplyGRPCEnvConfigs applies the env configurations for gRPC
+// ApplyGRPCEnvConfigs applies the env configurations for gRPC.
 func ApplyGRPCEnvConfigs(cfg Config) Config {
 	opts := getOptionsFromEnv()
 	for _, opt := range opts {
@@ -42,7 +42,7 @@ func ApplyGRPCEnvConfigs(cfg Config) Config {
 	return cfg
 }
 
-// ApplyHTTPEnvConfigs applies the env configurations for HTTP
+// ApplyHTTPEnvConfigs applies the env configurations for HTTP.
 func ApplyHTTPEnvConfigs(cfg Config) Config {
 	opts := getOptionsFromEnv()
 	for _, opt := range opts {
@@ -113,7 +113,7 @@ func withEndpointForGRPC(u *url.URL) func(cfg Config) Config {
 	}
 }
 
-// WithEnvCompression retrieves the specified config and passes it to ConfigFn as a Compression
+// WithEnvCompression retrieves the specified config and passes it to ConfigFn as a Compression.
 func WithEnvCompression(n string, fn func(Compression)) func(e *envconfig.EnvOptionsReader) {
 	return func(e *envconfig.EnvOptionsReader) {
 		if v, ok := e.GetEnvValue(n); ok {

exporters/otlp/otlptrace/internal/otlpconfig/optiontypes.go

@@ -37,7 +37,7 @@ const (
 	GzipCompression
 )
 
-// Marshaler describes the kind of message format sent to the collector
+// Marshaler describes the kind of message format sent to the collector.
 type Marshaler int
 
 const (

exporters/otlp/otlptrace/otlptracegrpc/client_test.go

@@ -167,7 +167,7 @@ func TestNewInvokeStartThenStopManyTimes(t *testing.T) {
 	}
 }
 
-// This test takes a long time to run: to skip it, run tests using: -short
+// This test takes a long time to run: to skip it, run tests using: -short.
 func TestNewCollectorOnBadConnection(t *testing.T) {
 	if testing.Short() {
 		t.Skipf("Skipping this long running test")

exporters/otlp/otlptrace/otlptracegrpc/mock_collector_test.go

@@ -150,7 +150,7 @@ func (mc *mockCollector) getHeaders() metadata.MD {
 	return mc.traceSvc.getHeaders()
 }
 
-// runMockCollector is a helper function to create a mock Collector
+// runMockCollector is a helper function to create a mock Collector.
 func runMockCollector(t *testing.T) *mockCollector {
 	return runMockCollectorAtEndpoint(t, "localhost:0")
 }

exporters/otlp/otlptrace/otlptracehttp/client.go

@@ -100,7 +100,7 @@ func NewClient(opts ...Option) otlptrace.Client {
 	}
 }
 
-// Start does nothing in a HTTP client
+// Start does nothing in a HTTP client.
 func (d *client) Start(ctx context.Context) error {
 	// nothing to do
 	select {

exporters/prometheus/sanitize.go

@@ -40,7 +40,7 @@ func sanitize(s string) string {
 	return s
 }
 
-// converts anything that is not a letter or digit to an underscore
+// converts anything that is not a letter or digit to an underscore.
 func sanitizeRune(r rune) rune {
 	if unicode.IsLetter(r) || unicode.IsDigit(r) {
 		return r

exporters/zipkin/env.go

@@ -16,13 +16,13 @@ package zipkin // import "go.opentelemetry.io/otel/exporters/zipkin"
 
 import "os"
 
-// Environment variable names
+// Environment variable names.
 const (
-	// Endpoint for Zipkin collector
+	// Endpoint for Zipkin collector.
 	envEndpoint = "OTEL_EXPORTER_ZIPKIN_ENDPOINT"
 )
 
-// envOr returns an env variable's value if it is exists or the default if not
+// envOr returns an env variable's value if it is exists or the default if not.
 func envOr(key, defaultValue string) string {
 	if v, ok := os.LookupEnv(key); ok && v != "" {
 		return v