forked from open-telemetry/opentelemetry-go
/
envconfig.go
150 lines (135 loc) · 5.13 KB
/
envconfig.go
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// 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 oconf // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/internal/oconf"
import (
"crypto/tls"
"crypto/x509"
"net/url"
"os"
"path"
"strings"
"time"
"go.opentelemetry.io/otel/exporters/otlp/internal/envconfig"
)
// DefaultEnvOptionsReader is the default environments reader.
var DefaultEnvOptionsReader = envconfig.EnvOptionsReader{
GetEnv: os.Getenv,
ReadFile: os.ReadFile,
Namespace: "OTEL_EXPORTER_OTLP",
}
// ApplyGRPCEnvConfigs applies the env configurations for gRPC.
func ApplyGRPCEnvConfigs(cfg Config) Config {
opts := getOptionsFromEnv()
for _, opt := range opts {
cfg = opt.ApplyGRPCOption(cfg)
}
return cfg
}
// ApplyHTTPEnvConfigs applies the env configurations for HTTP.
func ApplyHTTPEnvConfigs(cfg Config) Config {
opts := getOptionsFromEnv()
for _, opt := range opts {
cfg = opt.ApplyHTTPOption(cfg)
}
return cfg
}
func getOptionsFromEnv() []GenericOption {
opts := []GenericOption{}
tlsConf := &tls.Config{}
DefaultEnvOptionsReader.Apply(
envconfig.WithURL("ENDPOINT", func(u *url.URL) {
opts = append(opts, withEndpointScheme(u))
opts = append(opts, newSplitOption(func(cfg Config) Config {
cfg.Metrics.Endpoint = u.Host
// For OTLP/HTTP endpoint URLs without a per-signal
// configuration, the passed endpoint is used as a base URL
// and the signals are sent to these paths relative to that.
cfg.Metrics.URLPath = path.Join(u.Path, DefaultMetricsPath)
return cfg
}, withEndpointForGRPC(u)))
}),
envconfig.WithURL("METRICS_ENDPOINT", func(u *url.URL) {
opts = append(opts, withEndpointScheme(u))
opts = append(opts, newSplitOption(func(cfg Config) Config {
cfg.Metrics.Endpoint = u.Host
// For endpoint URLs for OTLP/HTTP per-signal variables, the
// URL MUST be used as-is without any modification. The only
// exception is that if an URL contains no path part, the root
// path / MUST be used.
path := u.Path
if path == "" {
path = "/"
}
cfg.Metrics.URLPath = path
return cfg
}, withEndpointForGRPC(u)))
}),
envconfig.WithCertPool("CERTIFICATE", func(p *x509.CertPool) { tlsConf.RootCAs = p }),
envconfig.WithCertPool("METRICS_CERTIFICATE", func(p *x509.CertPool) { tlsConf.RootCAs = p }),
envconfig.WithClientCert("CLIENT_CERTIFICATE", "CLIENT_KEY", func(c tls.Certificate) { tlsConf.Certificates = []tls.Certificate{c} }),
envconfig.WithClientCert("METRICS_CLIENT_CERTIFICATE", "METRICS_CLIENT_KEY", func(c tls.Certificate) { tlsConf.Certificates = []tls.Certificate{c} }),
envconfig.WithBool("INSECURE", func(b bool) { opts = append(opts, withInsecure(b)) }),
envconfig.WithBool("METRICS_INSECURE", func(b bool) { opts = append(opts, withInsecure(b)) }),
withTLSConfig(tlsConf, func(c *tls.Config) { opts = append(opts, WithTLSClientConfig(c)) }),
envconfig.WithHeaders("HEADERS", func(h map[string]string) { opts = append(opts, WithHeaders(h)) }),
envconfig.WithHeaders("METRICS_HEADERS", func(h map[string]string) { opts = append(opts, WithHeaders(h)) }),
WithEnvCompression("COMPRESSION", func(c Compression) { opts = append(opts, WithCompression(c)) }),
WithEnvCompression("METRICS_COMPRESSION", func(c Compression) { opts = append(opts, WithCompression(c)) }),
envconfig.WithDuration("TIMEOUT", func(d time.Duration) { opts = append(opts, WithTimeout(d)) }),
envconfig.WithDuration("METRICS_TIMEOUT", func(d time.Duration) { opts = append(opts, WithTimeout(d)) }),
)
return opts
}
func withEndpointForGRPC(u *url.URL) func(cfg Config) Config {
return func(cfg Config) Config {
// For OTLP/gRPC endpoints, this is the target to which the
// exporter is going to send telemetry.
cfg.Metrics.Endpoint = path.Join(u.Host, u.Path)
return cfg
}
}
// 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 {
cp := NoCompression
if v == "gzip" {
cp = GzipCompression
}
fn(cp)
}
}
}
func withEndpointScheme(u *url.URL) GenericOption {
switch strings.ToLower(u.Scheme) {
case "http", "unix":
return WithInsecure()
default:
return WithSecure()
}
}
// revive:disable-next-line:flag-parameter
func withInsecure(b bool) GenericOption {
if b {
return WithInsecure()
}
return WithSecure()
}
func withTLSConfig(c *tls.Config, fn func(*tls.Config)) func(e *envconfig.EnvOptionsReader) {
return func(e *envconfig.EnvOptionsReader) {
if c.RootCAs != nil || len(c.Certificates) > 0 {
fn(c)
}
}
}