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|
package detect
import (
"context"
"go.opentelemetry.io/otel/propagation"
)
const (
traceparentHeader = "traceparent"
tracestateHeader = "tracestate"
)
// Environ returns list of environment variables that need to be sent to the child process
// in order for it to pick up cross-process tracing from same state.
func Environ(ctx context.Context) []string {
var tm textMap
tc := propagation.TraceContext{}
tc.Inject(ctx, &tm)
var env []string
// deprecated: removed in v0.11.0
// previously defined in https://github.com/open-telemetry/opentelemetry-swift/blob/4ea467ed4b881d7329bf2254ca7ed7f2d9d6e1eb/Sources/OpenTelemetrySdk/Trace/Propagation/EnvironmentContextPropagator.swift#L14-L15
if tm.parent != "" {
env = append(env, "OTEL_TRACE_PARENT="+tm.parent)
}
if tm.state != "" {
env = append(env, "OTEL_TRACE_STATE="+tm.state)
}
// open-telemetry/opentelemetry-specification#740
if tm.parent != "" {
env = append(env, "TRACEPARENT="+tm.parent)
}
if tm.state != "" {
env = append(env, "TRACESTATE="+tm.state)
}
return env
}
type textMap struct {
parent string
state string
}
func (tm *textMap) Get(key string) string {
switch key {
case traceparentHeader:
return tm.parent
case tracestateHeader:
return tm.state
default:
return ""
}
}
func (tm *textMap) Set(key string, value string) {
switch key {
case traceparentHeader:
tm.parent = value
case tracestateHeader:
tm.state = value
}
}
func (tm *textMap) Keys() []string {
var k []string
if tm.parent != "" {
k = append(k, traceparentHeader)
}
if tm.state != "" {
k = append(k, tracestateHeader)
}
return k
}
|
