mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-16 10:19:23 +02:00
dfe2b6f143
* draft: otlp exporter trace grpc * address comments and improve usability * change passthrough example to go 1.15 * code cleanups * copy dependencies to `otlptrace` * fix typo on makefile * address comments * update code with latest changes * fix comments Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
196 lines
4.9 KiB
Go
196 lines
4.9 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package otlpconfig
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import (
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"crypto/tls"
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"fmt"
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"io/ioutil"
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"net/url"
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"os"
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"regexp"
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"strconv"
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"strings"
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"time"
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"go.opentelemetry.io/otel"
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)
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var httpSchemeRegexp = regexp.MustCompile(`(?i)^(http://|https://)`)
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func ApplyGRPCEnvConfigs(cfg *Config) {
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e := EnvOptionsReader{
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GetEnv: os.Getenv,
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ReadFile: ioutil.ReadFile,
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}
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e.ApplyGRPCEnvConfigs(cfg)
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}
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func ApplyHTTPEnvConfigs(cfg *Config) {
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e := EnvOptionsReader{
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GetEnv: os.Getenv,
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ReadFile: ioutil.ReadFile,
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}
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e.ApplyHTTPEnvConfigs(cfg)
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}
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type EnvOptionsReader struct {
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GetEnv func(string) string
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ReadFile func(filename string) ([]byte, error)
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}
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func (e *EnvOptionsReader) ApplyHTTPEnvConfigs(cfg *Config) {
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opts := e.GetOptionsFromEnv()
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for _, opt := range opts {
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opt.ApplyHTTPOption(cfg)
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}
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}
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func (e *EnvOptionsReader) ApplyGRPCEnvConfigs(cfg *Config) {
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opts := e.GetOptionsFromEnv()
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for _, opt := range opts {
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opt.ApplyGRPCOption(cfg)
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}
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}
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func (e *EnvOptionsReader) GetOptionsFromEnv() []GenericOption {
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var opts []GenericOption
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// Endpoint
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if v, ok := e.getEnvValue("ENDPOINT"); ok {
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if isInsecureEndpoint(v) {
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opts = append(opts, WithInsecure())
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} else {
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opts = append(opts, WithSecure())
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}
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opts = append(opts, WithEndpoint(trimSchema(v)))
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}
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if v, ok := e.getEnvValue("TRACES_ENDPOINT"); ok {
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if isInsecureEndpoint(v) {
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opts = append(opts, WithInsecureTraces())
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} else {
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opts = append(opts, WithSecureTraces())
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}
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opts = append(opts, WithTracesEndpoint(trimSchema(v)))
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}
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// Certificate File
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if path, ok := e.getEnvValue("CERTIFICATE"); ok {
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if tls, err := e.readTLSConfig(path); err == nil {
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opts = append(opts, WithTLSClientConfig(tls))
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} else {
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otel.Handle(fmt.Errorf("failed to configure otlp exporter certificate '%s': %w", path, err))
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}
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}
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if path, ok := e.getEnvValue("TRACES_CERTIFICATE"); ok {
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if tls, err := e.readTLSConfig(path); err == nil {
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opts = append(opts, WithTracesTLSClientConfig(tls))
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} else {
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otel.Handle(fmt.Errorf("failed to configure otlp traces exporter certificate '%s': %w", path, err))
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}
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}
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// Headers
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if h, ok := e.getEnvValue("HEADERS"); ok {
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opts = append(opts, WithHeaders(stringToHeader(h)))
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}
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if h, ok := e.getEnvValue("TRACES_HEADERS"); ok {
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opts = append(opts, WithTracesHeaders(stringToHeader(h)))
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}
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// Compression
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if c, ok := e.getEnvValue("COMPRESSION"); ok {
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opts = append(opts, WithCompression(stringToCompression(c)))
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}
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if c, ok := e.getEnvValue("TRACES_COMPRESSION"); ok {
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opts = append(opts, WithTracesCompression(stringToCompression(c)))
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}
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// Timeout
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if t, ok := e.getEnvValue("TIMEOUT"); ok {
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if d, err := strconv.Atoi(t); err == nil {
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opts = append(opts, WithTimeout(time.Duration(d)*time.Millisecond))
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}
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}
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if t, ok := e.getEnvValue("TRACES_TIMEOUT"); ok {
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if d, err := strconv.Atoi(t); err == nil {
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opts = append(opts, WithTracesTimeout(time.Duration(d)*time.Millisecond))
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}
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}
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return opts
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}
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func isInsecureEndpoint(endpoint string) bool {
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return strings.HasPrefix(strings.ToLower(endpoint), "http://")
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}
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func trimSchema(endpoint string) string {
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return httpSchemeRegexp.ReplaceAllString(endpoint, "")
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}
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// getEnvValue gets an OTLP environment variable value of the specified key using the GetEnv function.
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// This function already prepends the OTLP prefix to all key lookup.
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func (e *EnvOptionsReader) getEnvValue(key string) (string, bool) {
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v := strings.TrimSpace(e.GetEnv(fmt.Sprintf("OTEL_EXPORTER_OTLP_%s", key)))
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return v, v != ""
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}
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func (e *EnvOptionsReader) readTLSConfig(path string) (*tls.Config, error) {
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b, err := e.ReadFile(path)
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if err != nil {
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return nil, err
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}
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return CreateTLSConfig(b)
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}
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func stringToCompression(value string) Compression {
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switch value {
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case "gzip":
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return GzipCompression
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}
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return NoCompression
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}
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func stringToHeader(value string) map[string]string {
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headersPairs := strings.Split(value, ",")
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headers := make(map[string]string)
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for _, header := range headersPairs {
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nameValue := strings.SplitN(header, "=", 2)
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if len(nameValue) < 2 {
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continue
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}
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name, err := url.QueryUnescape(nameValue[0])
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if err != nil {
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continue
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}
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trimmedName := strings.TrimSpace(name)
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value, err := url.QueryUnescape(nameValue[1])
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if err != nil {
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continue
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}
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trimmedValue := strings.TrimSpace(value)
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headers[trimmedName] = trimmedValue
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}
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return headers
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}
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