tracing: support OTLP/HTTP in addition to gRPC

This change adds OTLP/HTTP, specifically http/protobuf support.

http/protobuf is recommended in
https://github.com/open-telemetry/opentelemetry-specification/blob/v1.8.0/specification/protocol/exporter.md.

However kube-apiserver and CRI-O use gRPC, kubelet may support
gRPC in future. So we should support gRPC as well.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

docs/tracing.md

@@ -0,0 +1,84 @@
+# Tracing
+
+containerd supports OpenTelemetry tracing since v1.6.0.
+Tracing currently targets only gRPC calls.
+
+## Sending traces from containerd deamon
+
+By configuring `io.containerd.tracing.processor.v1.otlp` plugin.
+containerd daemon can send traces to the specified OpenTelemetry endpoint.
+
+```toml
+[plugins."io.containerd.tracing.processor.v1.otlp"]
+    endpoint = "http://localhost:4318"
+```
+
+The following options are supported.
+
+- `endpoint`: The address of a server that receives [OpenTelemetry Protocol](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.8.0/specification/protocol/otlp.md).
+- `protocol`: OpenTelemetry supports multiple protocols.
+  The default value is "http/protobuf". "grpc" is also supported.
+- `insecure`: Disable transport security when the protocol is "grpc". The default is false.
+  "http/protobuf" always uses the schema provided by the endpoint and
+  the value of this setting being ignored.
+
+The sampling ratio and the service name on the traces could be configured by
+`io.containerd.internal.v1.tracing` plugin.
+
+```toml
+[plugins."io.containerd.internal.v1.tracing"]
+    sampling_ratio = 1.0
+    service_name = "containerd"
+```
+
+## Sending traces from containerd client
+
+By configuring its underlying gRPC client, containerd's Go client can send
+traces to an OpenTelemetry endpoint.
+
+Note that the Go client's methods and gRPC calls are not 1:1. Single method
+call would issue multiple gRPC calls.
+
+```go
+func clientWithTrace() error {
+	exp, err := otlptracehttp.New(ctx,
+		otlptracehttp.WithEndpoint("localhost:4318"),
+		otlptracehttp.WithInsecure(),
+	)
+	if err != nil {
+		return err
+	}
+
+	res, err := resource.New(ctx, resource.WithAttributes(
+		semconv.ServiceNameKey.String("CLIENT NAME"),
+	))
+	if err != nil {
+		return err
+	}
+
+	provider := trace.NewTracerProvider(
+		trace.WithSampler(trace.AlwaysSample()),
+		trace.WithSpanProcessor(trace.NewSimpleSpanProcessor(exp)),
+		trace.WithResource(res),
+	)
+	otel.SetTracerProvider(provider)
+	otel.SetTextMapPropagator(propagation.TraceContext{})
+
+    ...
+
+    dialOpts := []grpc.DialOption{
+        grpc.WithTransportCredentials(insecure.NewCredentials()),
+        grpc.WithStreamInterceptor(otelgrpc.StreamClientInterceptor()),
+        grpc.WithUnaryInterceptor(otelgrpc.UnaryClientInterceptor()),
+    }
+    client, ctx, cancel, err := commands.NewClient(context, containerd.WithDialOpts(dialOpts))
+    if err != nil {
+        return err
+    }
+    defer cancel()
+
+    span, ctx := tracing.StartSpan(ctx, "OPERATION NAME")
+    defer span.End()
+    ...
+}
+```

go.mod

@@ -60,7 +60,9 @@ require (
 	go.etcd.io/bbolt v1.3.6
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.28.0
 	go.opentelemetry.io/otel v1.3.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.3.0
 	go.opentelemetry.io/otel/sdk v1.3.0
 	go.opentelemetry.io/otel/trace v1.3.0
 	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 // indirect

go.sum

@@ -692,6 +692,8 @@ go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0 h1:giGm8w67Ja7amYNfYMdm
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0/go.mod h1:hO1KLR7jcKaDDKDkvI9dP/FIhpmna5lkqPUQdEjFAM8=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0 h1:VQbUHoJqytHHSJ1OZodPH9tvZZSVzUHjPHpkO85sT6k=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0/go.mod h1:keUU7UfnwWTWpJ+FWnyqmogPa82nuU5VUANFq49hlMY=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.3.0 h1:Ydage/P0fRrSPpZeCVxzjqGcI6iVmG2xb43+IR8cjqM=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.3.0/go.mod h1:QNX1aly8ehqqX1LEa6YniTU7VY9I6R3X/oPxhGdTceE=
 go.opentelemetry.io/otel/metric v0.20.0/go.mod h1:598I5tYlH1vzBjn+BTuhzTCSb/9debfNp6R3s7Pr1eU=
 go.opentelemetry.io/otel/oteltest v0.20.0/go.mod h1:L7bgKf9ZB7qCwT9Up7i9/pn0PWIa9FqQ2IQ8LoxiGnw=
 go.opentelemetry.io/otel/sdk v0.20.0/go.mod h1:g/IcepuwNsoiX5Byy2nNV0ySUF1em498m7hBWC279Yc=

integration/client/go.sum

@@ -642,6 +642,7 @@ go.opentelemetry.io/otel/exporters/otlp v0.20.0/go.mod h1:YIieizyaN77rtLJra0buKi
 go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0/go.mod h1:VpP4/RMn8bv8gNo9uK7/IMY4mtWLELsS+JIP0inH0h4=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0/go.mod h1:hO1KLR7jcKaDDKDkvI9dP/FIhpmna5lkqPUQdEjFAM8=
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0/go.mod h1:keUU7UfnwWTWpJ+FWnyqmogPa82nuU5VUANFq49hlMY=
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.3.0/go.mod h1:QNX1aly8ehqqX1LEa6YniTU7VY9I6R3X/oPxhGdTceE=
 go.opentelemetry.io/otel/metric v0.20.0/go.mod h1:598I5tYlH1vzBjn+BTuhzTCSb/9debfNp6R3s7Pr1eU=
 go.opentelemetry.io/otel/oteltest v0.20.0/go.mod h1:L7bgKf9ZB7qCwT9Up7i9/pn0PWIa9FqQ2IQ8LoxiGnw=
 go.opentelemetry.io/otel/sdk v0.20.0/go.mod h1:g/IcepuwNsoiX5Byy2nNV0ySUF1em498m7hBWC279Yc=

tracing/plugin/otlp.go

@@ -20,24 +20,24 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"net/url"
 	"time"
 
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/plugin"
 	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/resource"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
-	"google.golang.org/grpc"
 )
 
 const exporterPlugin = "otlp"
 
 func init() {
-	const timeout = 5 * time.Second
-
 	plugin.Register(&plugin.Registration{
 		ID:     exporterPlugin,
 		Type:   plugin.TracingProcessorPlugin,
@@ -45,28 +45,9 @@ func init() {
 		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
 			cfg := ic.Config.(*OTLPConfig)
 			if cfg.Endpoint == "" {
-				return nil, fmt.Errorf("otlp endpoint not set: %w", plugin.ErrSkipPlugin)
+				return nil, fmt.Errorf("no OpenTelemetry endpoint: %w", plugin.ErrSkipPlugin)
 			}
-
+			return newExporter(ic.Context, cfg)
-			opts := []otlptracegrpc.Option{
-				otlptracegrpc.WithEndpoint(cfg.Endpoint),
-				otlptracegrpc.WithDialOption(
-					grpc.WithBlock(),
-					grpc.WithReturnConnectionError(),
-				),
-			}
-			if cfg.Insecure {
-				opts = append(opts, otlptracegrpc.WithInsecure())
-			}
-
-			ctx, cancel := context.WithTimeout(ic.Context, timeout)
-			defer cancel()
-
-			exp, err := otlptracegrpc.New(ctx, opts...)
-			if err != nil {
-				return nil, fmt.Errorf("failed to create otlp exporter: %w", err)
-			}
-			return sdktrace.NewBatchSpanProcessor(exp), nil
 		},
 	})
 	plugin.Register(&plugin.Registration{
@@ -83,6 +64,7 @@ func init() {
 // OTLPConfig holds the configurations for the built-in otlp span processor
 type OTLPConfig struct {
 	Endpoint string `toml:"endpoint"`
+	Protocol string `toml:"protocol"`
 	Insecure bool   `toml:"insecure"`
 }
 
@@ -100,8 +82,46 @@ func (c *closer) Close() error {
 	return c.close()
 }
 
-// InitOpenTelemetry reads config and initializes otel middleware, sets the exporter
+// newExporter creates an exporter based on the given configuration.
-// propagator and global tracer provider
+//
+// The default protocol is http/protobuf since it is recommended by
+// https://github.com/open-telemetry/opentelemetry-specification/blob/v1.8.0/specification/protocol/exporter.md#specify-protocol.
+func newExporter(ctx context.Context, cfg *OTLPConfig) (*otlptrace.Exporter, error) {
+	const timeout = 5 * time.Second
+
+	ctx, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+
+	if cfg.Protocol == "http/protobuf" || cfg.Protocol == "" {
+		u, err := url.Parse(cfg.Endpoint)
+		if err != nil {
+			return nil, fmt.Errorf("OpenTelemetry endpoint %q is invalid: %w", cfg.Endpoint, err)
+		}
+		opts := []otlptracehttp.Option{
+			otlptracehttp.WithEndpoint(u.Host),
+		}
+		if u.Scheme == "http" {
+			opts = append(opts, otlptracehttp.WithInsecure())
+		}
+		return otlptracehttp.New(ctx, opts...)
+	} else if cfg.Protocol == "grpc" {
+		opts := []otlptracegrpc.Option{
+			otlptracegrpc.WithEndpoint(cfg.Endpoint),
+		}
+		if cfg.Insecure {
+			opts = append(opts, otlptracegrpc.WithInsecure())
+		}
+		return otlptracegrpc.New(ctx, opts...)
+	} else {
+		// Other protocols such as "http/json" are not supported.
+		return nil, fmt.Errorf("OpenTelemetry protocol %q is not supported", cfg.Protocol)
+	}
+}
+
+// newTracer configures protocol-agonostic tracing settings such as
+// its sampling ratio and returns io.Closer.
+//
+// Note that this function sets process-wide tracing configuration.
 func newTracer(ic *plugin.InitContext) (io.Closer, error) {
 	ctx := ic.Context
 	config := ic.Config.(*TraceConfig)
@@ -130,7 +150,7 @@ func newTracer(ic *plugin.InitContext) (io.Closer, error) {
 	for id, pctx := range ls {
 		p, err := pctx.Instance()
 		if err != nil {
-			log.G(ctx).WithError(err).Errorf("Failed to init tracing processor %q", id)
+			log.G(ctx).WithError(err).Errorf("failed to initialize a tracing processor %q", id)
 			continue
 		}
 		proc := p.(sdktrace.SpanProcessor)

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
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vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/client.go

@@ -0,0 +1,324 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package otlptracehttp // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+
+import (
+	"bytes"
+	"compress/gzip"
+	"context"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/url"
+	"path"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"google.golang.org/protobuf/proto"
+
+	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
+	coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
+	tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
+)
+
+const contentTypeProto = "application/x-protobuf"
+
+var gzPool = sync.Pool{
+	New: func() interface{} {
+		w := gzip.NewWriter(ioutil.Discard)
+		return w
+	},
+}
+
+// Keep it in sync with golang's DefaultTransport from net/http! We
+// have our own copy to avoid handling a situation where the
+// DefaultTransport is overwritten with some different implementation
+// of http.RoundTripper or it's modified by other package.
+var ourTransport = &http.Transport{
+	Proxy: http.ProxyFromEnvironment,
+	DialContext: (&net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
+	}).DialContext,
+	ForceAttemptHTTP2:     true,
+	MaxIdleConns:          100,
+	IdleConnTimeout:       90 * time.Second,
+	TLSHandshakeTimeout:   10 * time.Second,
+	ExpectContinueTimeout: 1 * time.Second,
+}
+
+type client struct {
+	name        string
+	cfg         otlpconfig.SignalConfig
+	generalCfg  otlpconfig.Config
+	requestFunc retry.RequestFunc
+	client      *http.Client
+	stopCh      chan struct{}
+	stopOnce    sync.Once
+}
+
+var _ otlptrace.Client = (*client)(nil)
+
+// NewClient creates a new HTTP trace client.
+func NewClient(opts ...Option) otlptrace.Client {
+	cfg := otlpconfig.NewDefaultConfig()
+	otlpconfig.ApplyHTTPEnvConfigs(&cfg)
+	for _, opt := range opts {
+		opt.applyHTTPOption(&cfg)
+	}
+
+	for pathPtr, defaultPath := range map[*string]string{
+		&cfg.Traces.URLPath: otlpconfig.DefaultTracesPath,
+	} {
+		tmp := strings.TrimSpace(*pathPtr)
+		if tmp == "" {
+			tmp = defaultPath
+		} else {
+			tmp = path.Clean(tmp)
+			if !path.IsAbs(tmp) {
+				tmp = fmt.Sprintf("/%s", tmp)
+			}
+		}
+		*pathPtr = tmp
+	}
+
+	httpClient := &http.Client{
+		Transport: ourTransport,
+		Timeout:   cfg.Traces.Timeout,
+	}
+	if cfg.Traces.TLSCfg != nil {
+		transport := ourTransport.Clone()
+		transport.TLSClientConfig = cfg.Traces.TLSCfg
+		httpClient.Transport = transport
+	}
+
+	stopCh := make(chan struct{})
+	return &client{
+		name:        "traces",
+		cfg:         cfg.Traces,
+		generalCfg:  cfg,
+		requestFunc: cfg.RetryConfig.RequestFunc(evaluate),
+		stopCh:      stopCh,
+		client:      httpClient,
+	}
+}
+
+// Start does nothing in a HTTP client
+func (d *client) Start(ctx context.Context) error {
+	// nothing to do
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+// Stop shuts down the client and interrupt any in-flight request.
+func (d *client) Stop(ctx context.Context) error {
+	d.stopOnce.Do(func() {
+		close(d.stopCh)
+	})
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}
+
+// UploadTraces sends a batch of spans to the collector.
+func (d *client) UploadTraces(ctx context.Context, protoSpans []*tracepb.ResourceSpans) error {
+	pbRequest := &coltracepb.ExportTraceServiceRequest{
+		ResourceSpans: protoSpans,
+	}
+	rawRequest, err := proto.Marshal(pbRequest)
+	if err != nil {
+		return err
+	}
+
+	ctx, cancel := d.contextWithStop(ctx)
+	defer cancel()
+
+	request, err := d.newRequest(rawRequest)
+	if err != nil {
+		return err
+	}
+
+	return d.requestFunc(ctx, func(ctx context.Context) error {
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		default:
+		}
+
+		request.reset(ctx)
+		resp, err := d.client.Do(request.Request)
+		if err != nil {
+			return err
+		}
+
+		var rErr error
+		switch resp.StatusCode {
+		case http.StatusOK:
+			// Success, do not retry.
+		case http.StatusTooManyRequests,
+			http.StatusServiceUnavailable:
+			// Retry-able failure.
+			rErr = newResponseError(resp.Header)
+
+			// Going to retry, drain the body to reuse the connection.
+			if _, err := io.Copy(ioutil.Discard, resp.Body); err != nil {
+				_ = resp.Body.Close()
+				return err
+			}
+		default:
+			rErr = fmt.Errorf("failed to send %s to %s: %s", d.name, request.URL, resp.Status)
+		}
+
+		if err := resp.Body.Close(); err != nil {
+			return err
+		}
+		return rErr
+	})
+}
+
+func (d *client) newRequest(body []byte) (request, error) {
+	u := url.URL{Scheme: d.getScheme(), Host: d.cfg.Endpoint, Path: d.cfg.URLPath}
+	r, err := http.NewRequest(http.MethodPost, u.String(), nil)
+	if err != nil {
+		return request{Request: r}, err
+	}
+
+	for k, v := range d.cfg.Headers {
+		r.Header.Set(k, v)
+	}
+	r.Header.Set("Content-Type", contentTypeProto)
+
+	req := request{Request: r}
+	switch Compression(d.cfg.Compression) {
+	case NoCompression:
+		r.ContentLength = (int64)(len(body))
+		req.bodyReader = bodyReader(body)
+	case GzipCompression:
+		// Ensure the content length is not used.
+		r.ContentLength = -1
+		r.Header.Set("Content-Encoding", "gzip")
+
+		gz := gzPool.Get().(*gzip.Writer)
+		defer gzPool.Put(gz)
+
+		var b bytes.Buffer
+		gz.Reset(&b)
+
+		if _, err := gz.Write(body); err != nil {
+			return req, err
+		}
+		// Close needs to be called to ensure body if fully written.
+		if err := gz.Close(); err != nil {
+			return req, err
+		}
+
+		req.bodyReader = bodyReader(b.Bytes())
+	}
+
+	return req, nil
+}
+
+// bodyReader returns a closure returning a new reader for buf.
+func bodyReader(buf []byte) func() io.ReadCloser {
+	return func() io.ReadCloser {
+		return ioutil.NopCloser(bytes.NewReader(buf))
+	}
+}
+
+// request wraps an http.Request with a resettable body reader.
+type request struct {
+	*http.Request
+
+	// bodyReader allows the same body to be used for multiple requests.
+	bodyReader func() io.ReadCloser
+}
+
+// reset reinitializes the request Body and uses ctx for the request.
+func (r *request) reset(ctx context.Context) {
+	r.Body = r.bodyReader()
+	r.Request = r.Request.WithContext(ctx)
+}
+
+// retryableError represents a request failure that can be retried.
+type retryableError struct {
+	throttle int64
+}
+
+// newResponseError returns a retryableError and will extract any explicit
+// throttle delay contained in headers.
+func newResponseError(header http.Header) error {
+	var rErr retryableError
+	if s, ok := header["Retry-After"]; ok {
+		if t, err := strconv.ParseInt(s[0], 10, 64); err == nil {
+			rErr.throttle = t
+		}
+	}
+	return rErr
+}
+
+func (e retryableError) Error() string {
+	return "retry-able request failure"
+}
+
+// evaluate returns if err is retry-able. If it is and it includes an explicit
+// throttling delay, that delay is also returned.
+func evaluate(err error) (bool, time.Duration) {
+	if err == nil {
+		return false, 0
+	}
+
+	rErr, ok := err.(retryableError)
+	if !ok {
+		return false, 0
+	}
+
+	return true, time.Duration(rErr.throttle)
+}
+
+func (d *client) getScheme() string {
+	if d.cfg.Insecure {
+		return "http"
+	}
+	return "https"
+}
+
+func (d *client) contextWithStop(ctx context.Context) (context.Context, context.CancelFunc) {
+	// Unify the parent context Done signal with the client's stop
+	// channel.
+	ctx, cancel := context.WithCancel(ctx)
+	go func(ctx context.Context, cancel context.CancelFunc) {
+		select {
+		case <-ctx.Done():
+			// Nothing to do, either cancelled or deadline
+			// happened.
+		case <-d.stopCh:
+			cancel()
+		}
+	}(ctx, cancel)
+	return ctx, cancel
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/doc.go

@@ -0,0 +1,19 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/*
+Package otlptracehttp a client that sends traces to the collector using HTTP
+with binary protobuf payloads.
+*/
+package otlptracehttp // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/exporter.go

@@ -0,0 +1,31 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package otlptracehttp // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+)
+
+// New constructs a new Exporter and starts it.
+func New(ctx context.Context, opts ...Option) (*otlptrace.Exporter, error) {
+	return otlptrace.New(ctx, NewClient(opts...))
+}
+
+// NewUnstarted constructs a new Exporter and does not start it.
+func NewUnstarted(opts ...Option) *otlptrace.Exporter {
+	return otlptrace.NewUnstarted(NewClient(opts...))
+}

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/go.mod

@@ -0,0 +1,80 @@
+module go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp
+
+go 1.16
+
+require (
+	github.com/stretchr/testify v1.7.0
+	go.opentelemetry.io/otel v1.3.0
+	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0
+	go.opentelemetry.io/otel/sdk v1.3.0
+	go.opentelemetry.io/otel/trace v1.3.0
+	go.opentelemetry.io/proto/otlp v0.11.0
+	google.golang.org/protobuf v1.27.1
+)
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlptrace => ../
+
+replace go.opentelemetry.io/otel => ../../../..
+
+replace go.opentelemetry.io/otel/bridge/opencensus => ../../../../bridge/opencensus
+
+replace go.opentelemetry.io/otel/bridge/opentracing => ../../../../bridge/opentracing
+
+replace go.opentelemetry.io/otel/example/jaeger => ../../../../example/jaeger
+
+replace go.opentelemetry.io/otel/example/namedtracer => ../../../../example/namedtracer
+
+replace go.opentelemetry.io/otel/example/opencensus => ../../../../example/opencensus
+
+replace go.opentelemetry.io/otel/example/otel-collector => ../../../../example/otel-collector
+
+replace go.opentelemetry.io/otel/example/passthrough => ../../../../example/passthrough
+
+replace go.opentelemetry.io/otel/example/prom-collector => ../../../../example/prom-collector
+
+replace go.opentelemetry.io/otel/example/prometheus => ../../../../example/prometheus
+
+replace go.opentelemetry.io/otel/example/zipkin => ../../../../example/zipkin
+
+replace go.opentelemetry.io/otel/exporters/prometheus => ../../../prometheus
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc => ../otlptracegrpc
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp => ./
+
+replace go.opentelemetry.io/otel/exporters/jaeger => ../../../jaeger
+
+replace go.opentelemetry.io/otel/exporters/zipkin => ../../../zipkin
+
+replace go.opentelemetry.io/otel/internal/tools => ../../../../internal/tools
+
+replace go.opentelemetry.io/otel/metric => ../../../../metric
+
+replace go.opentelemetry.io/otel/sdk => ../../../../sdk
+
+replace go.opentelemetry.io/otel/sdk/export/metric => ../../../../sdk/export/metric
+
+replace go.opentelemetry.io/otel/sdk/metric => ../../../../sdk/metric
+
+replace go.opentelemetry.io/otel/trace => ../../../../trace
+
+replace go.opentelemetry.io/otel/internal/metric => ../../../../internal/metric
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric => ../../otlpmetric
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc => ../../otlpmetric/otlpmetricgrpc
+
+replace go.opentelemetry.io/otel/exporters/stdout/stdoutmetric => ../../../stdout/stdoutmetric
+
+replace go.opentelemetry.io/otel/exporters/stdout/stdouttrace => ../../../stdout/stdouttrace
+
+replace go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp => ../../otlpmetric/otlpmetrichttp
+
+replace go.opentelemetry.io/otel/bridge/opencensus/test => ../../../../bridge/opencensus/test
+
+replace go.opentelemetry.io/otel/example/fib => ../../../../example/fib
+
+replace go.opentelemetry.io/otel/schema => ../../../../schema
+
+replace go.opentelemetry.io/otel/exporters/otlp/internal/retry => ../../internal/retry

vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/go.sum

@@ -0,0 +1,138 @@
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vendor/go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/options.go

@@ -0,0 +1,108 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package otlptracehttp // import "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+
+import (
+	"crypto/tls"
+	"time"
+
+	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig"
+)
+
+// Compression describes the compression used for payloads sent to the
+// collector.
+type Compression otlpconfig.Compression
+
+const (
+	// NoCompression tells the driver to send payloads without
+	// compression.
+	NoCompression = Compression(otlpconfig.NoCompression)
+	// GzipCompression tells the driver to send payloads after
+	// compressing them with gzip.
+	GzipCompression = Compression(otlpconfig.GzipCompression)
+)
+
+// Option applies an option to the HTTP client.
+type Option interface {
+	applyHTTPOption(*otlpconfig.Config)
+}
+
+// RetryConfig defines configuration for retrying batches in case of export
+// failure using an exponential backoff.
+type RetryConfig retry.Config
+
+type wrappedOption struct {
+	otlpconfig.HTTPOption
+}
+
+func (w wrappedOption) applyHTTPOption(cfg *otlpconfig.Config) {
+	w.ApplyHTTPOption(cfg)
+}
+
+// WithEndpoint allows one to set the address of the collector
+// endpoint that the driver will use to send spans. If
+// unset, it will instead try to use
+// the default endpoint (localhost:4317). Note that the endpoint
+// must not contain any URL path.
+func WithEndpoint(endpoint string) Option {
+	return wrappedOption{otlpconfig.WithEndpoint(endpoint)}
+}
+
+// WithCompression tells the driver to compress the sent data.
+func WithCompression(compression Compression) Option {
+	return wrappedOption{otlpconfig.WithCompression(otlpconfig.Compression(compression))}
+}
+
+// WithURLPath allows one to override the default URL path used
+// for sending traces. If unset, default ("/v1/traces") will be used.
+func WithURLPath(urlPath string) Option {
+	return wrappedOption{otlpconfig.WithURLPath(urlPath)}
+}
+
+// WithTLSClientConfig can be used to set up a custom TLS
+// configuration for the client used to send payloads to the
+// collector. Use it if you want to use a custom certificate.
+func WithTLSClientConfig(tlsCfg *tls.Config) Option {
+	return wrappedOption{otlpconfig.WithTLSClientConfig(tlsCfg)}
+}
+
+// WithInsecure tells the driver to connect to the collector using the
+// HTTP scheme, instead of HTTPS.
+func WithInsecure() Option {
+	return wrappedOption{otlpconfig.WithInsecure()}
+}
+
+// WithHeaders allows one to tell the driver to send additional HTTP
+// headers with the payloads. Specifying headers like Content-Length,
+// Content-Encoding and Content-Type may result in a broken driver.
+func WithHeaders(headers map[string]string) Option {
+	return wrappedOption{otlpconfig.WithHeaders(headers)}
+}
+
+// WithTimeout tells the driver the max waiting time for the backend to process
+// each spans batch.  If unset, the default will be 10 seconds.
+func WithTimeout(duration time.Duration) Option {
+	return wrappedOption{otlpconfig.WithTimeout(duration)}
+}
+
+// WithRetry configures the retry policy for transient errors that may occurs
+// when exporting traces. An exponential back-off algorithm is used to ensure
+// endpoints are not overwhelmed with retries. If unset, the default retry
+// policy will retry after 5 seconds and increase exponentially after each
+// error for a total of 1 minute.
+func WithRetry(rc RetryConfig) Option {
+	return wrappedOption{otlpconfig.WithRetry(retry.Config(rc))}
+}

vendor/modules.txt

@@ -399,12 +399,16 @@ go.opentelemetry.io/otel/semconv/v1.7.0
 # go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.3.0
 go.opentelemetry.io/otel/exporters/otlp/internal/retry
 # go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.3.0
+## explicit
 go.opentelemetry.io/otel/exporters/otlp/otlptrace
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/tracetransform
 # go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.3.0
 ## explicit
 go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc
+# go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.3.0
+## explicit
+go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp
 # go.opentelemetry.io/otel/sdk v1.3.0
 ## explicit
 go.opentelemetry.io/otel/sdk/instrumentation