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Decouple
otlp/otlpmetric/otlpmetricgrpc from otlp/internal and `o…
…tlp/otlpmetric/internal` using gotmp (open-telemetry#4404) * Add shared otlpmetric templates * Generate otlpmetricgrpc/internal with gotmpl * Use local internal in otlpmetricgrpc * Add decoupling change to changelog
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202 changes: 202 additions & 0 deletions
202
exporters/otlp/otlpmetric/otlpmetricgrpc/internal/envconfig/envconfig.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| // Code created by gotmpl. DO NOT MODIFY. | ||
| // source: internal/shared/otlp/envconfig/envconfig.go.tmpl | ||
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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. | ||
|
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| package envconfig // import "go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc/internal/envconfig" | ||
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| import ( | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "errors" | ||
| "fmt" | ||
| "net/url" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
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| "go.opentelemetry.io/otel/internal/global" | ||
| ) | ||
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| // ConfigFn is the generic function used to set a config. | ||
| type ConfigFn func(*EnvOptionsReader) | ||
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| // EnvOptionsReader reads the required environment variables. | ||
| type EnvOptionsReader struct { | ||
| GetEnv func(string) string | ||
| ReadFile func(string) ([]byte, error) | ||
| Namespace string | ||
| } | ||
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| // Apply runs every ConfigFn. | ||
| func (e *EnvOptionsReader) Apply(opts ...ConfigFn) { | ||
| for _, o := range opts { | ||
| o(e) | ||
| } | ||
| } | ||
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| // 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 != "" | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
| } | ||
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| // 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)) | ||
| } | ||
| } | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
| } | ||
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| // 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) | ||
| } | ||
| } | ||
|
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| func keyWithNamespace(ns, key string) string { | ||
| if ns == "" { | ||
| return key | ||
| } | ||
| return fmt.Sprintf("%s_%s", ns, key) | ||
| } | ||
|
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| func stringToHeader(value string) map[string]string { | ||
| headersPairs := strings.Split(value, ",") | ||
| headers := make(map[string]string) | ||
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| 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) | ||
|
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| headers[trimmedName] = trimmedValue | ||
| } | ||
|
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| return headers | ||
| } | ||
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| 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 | ||
| } |
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