Decouple otlp/otlpmetric/otlpmetrichttp from otlp/internal and otlp/otlpmetric/internal using gotmp

CHANGELOG.md

@@ -57,6 +57,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Improve context cancelation handling in batch span processor's `ForceFlush` in  `go.opentelemetry.io/otel/sdk/trace`. (#4369)
 - Decouple `go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal` from `go.opentelemetry.io/otel/exporters/otlp/internal` using gotmpl. (#4397, #3846)
 - Decouple `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal` from `go.opentelemetry.io/otel/exporters/otlp/internal` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal` using gotmpl. (#4404, #3846)
+- Decouple `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal` from `go.opentelemetry.io/otel/exporters/otlp/internal` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal` using gotmpl. (#4407, #3846)
 - Decouple `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc/internal` from `go.opentelemetry.io/otel/exporters/otlp/internal` and `go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal` using gotmpl. (#4400, #3846)
 - Decouple `go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp/internal` from `go.opentelemetry.io/otel/exporters/otlp/internal` and `go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal` using gotmpl. (#4401, #3846)
 - Do not block the metric SDK when OTLP metric exports are blocked in `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc` and `go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp`. (#3925, #4395)

exporters/otlp/otlpmetric/otlpmetrichttp/client.go

@@ -30,10 +30,10 @@ import (
 	"google.golang.org/protobuf/proto"
 
 	"go.opentelemetry.io/otel"
-	"go.opentelemetry.io/otel/exporters/otlp/internal"
-	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
-	ominternal "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/retry"
 	colmetricpb "go.opentelemetry.io/proto/otlp/collector/metrics/v1"
 	metricpb "go.opentelemetry.io/proto/otlp/metrics/v1"
 )
@@ -89,7 +89,8 @@ func newClient(cfg oconf.Config) (*client, error) {
 		return nil, err
 	}
 
-	req.Header.Set("User-Agent", ominternal.GetUserAgentHeader())
+	userAgent := "OTel OTLP Exporter Go/" + otlpmetric.Version()
+	req.Header.Set("User-Agent", userAgent)
 
 	if n := len(cfg.Metrics.Headers); n > 0 {
 		for k, v := range cfg.Metrics.Headers {

exporters/otlp/otlpmetric/otlpmetrichttp/client_test.go

@@ -27,9 +27,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	ominternal "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/otest"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/otest"
 	"go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/aggregation"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
@@ -50,7 +49,7 @@ func (clientShim) ForceFlush(ctx context.Context) error {
 }
 
 func TestClient(t *testing.T) {
-	factory := func(rCh <-chan otest.ExportResult) (ominternal.Client, otest.Collector) {
+	factory := func(rCh <-chan otest.ExportResult) (otest.Client, otest.Collector) {
 		coll, err := otest.NewHTTPCollector("", rCh)
 		require.NoError(t, err)
 

exporters/otlp/otlpmetric/otlpmetrichttp/config.go

@@ -18,8 +18,8 @@ import (
 	"crypto/tls"
 	"time"
 
-	"go.opentelemetry.io/otel/exporters/otlp/internal/retry"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/retry"
 	"go.opentelemetry.io/otel/sdk/metric"
 )
 

exporters/otlp/otlpmetric/otlpmetrichttp/exporter.go

@@ -19,8 +19,8 @@ import (
 	"fmt"
 	"sync"
 
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/transform"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/transform"
 	"go.opentelemetry.io/otel/internal/global"
 	"go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/aggregation"

exporters/otlp/otlpmetric/otlpmetrichttp/exporter_test.go

@@ -23,8 +23,8 @@ import (
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
-	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/otest"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/oconf"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/otest"
 	"go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/metric/metricdata"
 )

exporters/otlp/otlpmetric/otlpmetrichttp/go.mod

@@ -5,33 +5,32 @@ go 1.19
 retract v0.32.2 // Contains unresolvable dependencies.
 
 require (
+	github.com/cenkalti/backoff/v4 v4.2.1
+	github.com/google/go-cmp v0.5.9
 	github.com/stretchr/testify v1.8.4
 	go.opentelemetry.io/otel v1.16.0
-	go.opentelemetry.io/otel/exporters/otlp/internal/retry v1.16.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.39.0
+	go.opentelemetry.io/otel/sdk v1.16.0
 	go.opentelemetry.io/otel/sdk/metric v0.39.0
 	go.opentelemetry.io/proto/otlp v1.0.0
+	google.golang.org/grpc v1.57.0
 	google.golang.org/protobuf v1.31.0
 )
 
 require (
-	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/protobuf v1.5.3 // indirect
-	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.16.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	go.opentelemetry.io/otel/metric v1.16.0 // indirect
-	go.opentelemetry.io/otel/sdk v1.16.0 // indirect
 	go.opentelemetry.io/otel/trace v1.16.0 // indirect
 	golang.org/x/net v0.10.0 // indirect
 	golang.org/x/sys v0.11.0 // indirect
 	golang.org/x/text v0.9.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20230530153820-e85fd2cbaebc // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20230530153820-e85fd2cbaebc // indirect
-	google.golang.org/grpc v1.57.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 

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

@@ -0,0 +1,202 @@
+// Code created by gotmpl. DO NOT MODIFY.
+// source: internal/shared/otlp/envconfig/envconfig.go.tmpl
+
+// 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 envconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp/internal/envconfig"
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"go.opentelemetry.io/otel/internal/global"
+)
+
+// ConfigFn is the generic function used to set a config.
+type ConfigFn func(*EnvOptionsReader)
+
+// EnvOptionsReader reads the required environment variables.
+type EnvOptionsReader struct {
+	GetEnv    func(string) string
+	ReadFile  func(string) ([]byte, error)
+	Namespace string
+}
+
+// Apply runs every ConfigFn.
+func (e *EnvOptionsReader) Apply(opts ...ConfigFn) {
+	for _, o := range opts {
+		o(e)
+	}
+}
+
+// GetEnvValue gets an OTLP environment variable value of the specified key
+// using the GetEnv function.
+// This function prepends the OTLP specified namespace to all key lookups.
+func (e *EnvOptionsReader) GetEnvValue(key string) (string, bool) {
+	v := strings.TrimSpace(e.GetEnv(keyWithNamespace(e.Namespace, key)))
+	return v, v != ""
+}
+
+// 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 {
+			fn(v)
+		}
+	}
+}
+
+// WithBool returns a ConfigFn that reads the environment variable n and if it exists passes its parsed bool value to fn.
+func WithBool(n string, fn func(bool)) ConfigFn {
+	return func(e *EnvOptionsReader) {
+		if v, ok := e.GetEnvValue(n); ok {
+			b := strings.ToLower(v) == "true"
+			fn(b)
+		}
+	}
+}
+
+// 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 {
+			d, err := strconv.Atoi(v)
+			if err != nil {
+				global.Error(err, "parse duration", "input", v)
+				return
+			}
+			fn(time.Duration(d) * time.Millisecond)
+		}
+	}
+}
+
+// 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 {
+			fn(stringToHeader(v))
+		}
+	}
+}
+
+// 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 {
+			u, err := url.Parse(v)
+			if err != nil {
+				global.Error(err, "parse url", "input", v)
+				return
+			}
+			fn(u)
+		}
+	}
+}
+
+// WithCertPool returns a ConfigFn that reads the environment variable n as a filepath to a TLS certificate pool. If it exists, it is parsed as a crypto/x509.CertPool and it is passed to fn.
+func WithCertPool(n string, fn func(*x509.CertPool)) ConfigFn {
+	return func(e *EnvOptionsReader) {
+		if v, ok := e.GetEnvValue(n); ok {
+			b, err := e.ReadFile(v)
+			if err != nil {
+				global.Error(err, "read tls ca cert file", "file", v)
+				return
+			}
+			c, err := createCertPool(b)
+			if err != nil {
+				global.Error(err, "create tls cert pool")
+				return
+			}
+			fn(c)
+		}
+	}
+}
+
+// WithClientCert returns a ConfigFn that reads the environment variable nc and nk as filepaths to a client certificate and key pair. If they exists, they are parsed as a crypto/tls.Certificate and it is passed to fn.
+func WithClientCert(nc, nk string, fn func(tls.Certificate)) ConfigFn {
+	return func(e *EnvOptionsReader) {
+		vc, okc := e.GetEnvValue(nc)
+		vk, okk := e.GetEnvValue(nk)
+		if !okc || !okk {
+			return
+		}
+		cert, err := e.ReadFile(vc)
+		if err != nil {
+			global.Error(err, "read tls client cert", "file", vc)
+			return
+		}
+		key, err := e.ReadFile(vk)
+		if err != nil {
+			global.Error(err, "read tls client key", "file", vk)
+			return
+		}
+		crt, err := tls.X509KeyPair(cert, key)
+		if err != nil {
+			global.Error(err, "create tls client key pair")
+			return
+		}
+		fn(crt)
+	}
+}
+
+func keyWithNamespace(ns, key string) string {
+	if ns == "" {
+		return key
+	}
+	return fmt.Sprintf("%s_%s", ns, key)
+}
+
+func stringToHeader(value string) map[string]string {
+	headersPairs := strings.Split(value, ",")
+	headers := make(map[string]string)
+
+	for _, header := range headersPairs {
+		n, v, found := strings.Cut(header, "=")
+		if !found {
+			global.Error(errors.New("missing '="), "parse headers", "input", header)
+			continue
+		}
+		name, err := url.QueryUnescape(n)
+		if err != nil {
+			global.Error(err, "escape header key", "key", n)
+			continue
+		}
+		trimmedName := strings.TrimSpace(name)
+		value, err := url.QueryUnescape(v)
+		if err != nil {
+			global.Error(err, "escape header value", "value", v)
+			continue
+		}
+		trimmedValue := strings.TrimSpace(value)
+
+		headers[trimmedName] = trimmedValue
+	}
+
+	return headers
+}
+
+func createCertPool(certBytes []byte) (*x509.CertPool, error) {
+	cp := x509.NewCertPool()
+	if ok := cp.AppendCertsFromPEM(certBytes); !ok {
+		return nil, errors.New("failed to append certificate to the cert pool")
+	}
+	return cp, nil
+}