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option.go
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/
option.go
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// Unless explicitly stated otherwise all files in this repository are licensed
// under the Apache License Version 2.0.
// This product includes software developed at Datadog (https://www.datadoghq.com/).
// Copyright 2023 Datadog, Inc.
package telemetry
import (
"errors"
"net/http"
"net/url"
"os"
"path/filepath"
"gopkg.in/DataDog/dd-trace-go.v1/internal/globalconfig"
)
// An Option is used to configure the telemetry client's settings
type Option func(*client)
// ApplyOps sets various fields of the client
func (c *client) ApplyOps(opts ...Option) {
c.mu.Lock()
defer c.mu.Unlock()
for _, opt := range opts {
opt(c)
}
}
// WithNamespace sets name as the telemetry client's namespace (tracer, profiler, appsec)
func WithNamespace(name Namespace) Option {
return func(client *client) {
client.Namespace = name
}
}
// WithEnv sets the app specific environment for the telemetry client
func WithEnv(env string) Option {
return func(client *client) {
client.Env = env
}
}
// WithService sets the app specific service for the telemetry client
func WithService(service string) Option {
return func(client *client) {
client.Service = service
}
}
// WithVersion sets the app specific version for the telemetry client
func WithVersion(version string) Option {
return func(client *client) {
client.Version = version
}
}
// WithHTTPClient specifies the http client for the telemetry client
func WithHTTPClient(httpClient *http.Client) Option {
return func(client *client) {
client.Client = httpClient
}
}
func defaultAPIKey() string {
return os.Getenv("DD_API_KEY")
}
// WithAPIKey sets the DD API KEY for the telemetry client
func WithAPIKey(v string) Option {
return func(client *client) {
client.APIKey = v
}
}
// WithURL sets the URL for where telemetry information is flushed to.
// For the URL, uploading through agent goes through
//
// ${AGENT_URL}/telemetry/proxy/api/v2/apmtelemetry
//
// for agentless:
//
// https://instrumentation-telemetry-intake.datadoghq.com/api/v2/apmtelemetry
//
// with an API key
func WithURL(agentless bool, agentURL string) Option {
return func(client *client) {
if agentless {
client.URL = getAgentlessURL()
} else {
u, err := url.Parse(agentURL)
if err == nil {
u.Path = "/telemetry/proxy/api/v2/apmtelemetry"
client.URL = u.String()
} else {
log("Agent URL %s is invalid, switching to agentless telemetry endpoint", agentURL)
client.URL = getAgentlessURL()
}
}
}
}
func getAgentlessURL() string {
agentlessEndpointLock.RLock()
defer agentlessEndpointLock.RUnlock()
return agentlessURL
}
// configEnvFallback returns the value of environment variable with the
// given key if def == ""
func configEnvFallback(key, def string) string {
if def != "" {
return def
}
return os.Getenv(key)
}
// fallbackOps populates missing fields of the client with environment variables
// or default values.
func (c *client) fallbackOps() error {
if c.Client == nil {
WithHTTPClient(defaultHTTPClient)(c)
}
if len(c.APIKey) == 0 && c.URL == getAgentlessURL() {
WithAPIKey(defaultAPIKey())(c)
if c.APIKey == "" {
return errors.New("agentless is turned on, but valid DD API key was not found")
}
}
c.Service = configEnvFallback("DD_SERVICE", c.Service)
if len(c.Service) == 0 {
if name := globalconfig.ServiceName(); len(name) != 0 {
c.Service = name
} else {
c.Service = filepath.Base(os.Args[0])
}
}
c.Env = configEnvFallback("DD_ENV", c.Env)
c.Version = configEnvFallback("DD_VERSION", c.Version)
return nil
}