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package otelutil
import (
"os"
)
const (
traceParentKey = "traceparent"
traceStateKey = "tracestate"
// See https://github.com/open-telemetry/opentelemetry-specification/issues/740
// and https://github.com/open-telemetry/oteps/pull/258.
traceParentEnvVar = "TRACEPARENT"
traceStateEnvVar = "TRACESTATE"
)
type EnvironCarrier struct {
TraceParent, TraceState string
}
// Get returns the value associated with the passed key.
func (c *EnvironCarrier) Get(key string) string {
switch key {
case traceParentKey:
return c.TraceParent
case traceStateKey:
return c.TraceState
}
return ""
}
// Set stores the key-value pair.
func (c *EnvironCarrier) Set(key, value string) {
switch key {
case traceParentKey:
c.TraceParent = value
case traceStateKey:
c.TraceState = value
}
// Other keys are not supported at this time.
}
// Keys lists the keys stored in this carrier.
func (c *EnvironCarrier) Keys() []string {
var k []string
if c.TraceParent != "" {
k = append(k, traceParentKey)
}
if c.TraceState != "" {
k = append(k, traceStateKey)
}
return k
}
func (c *EnvironCarrier) Environ() []string {
var env []string
if c.TraceParent != "" {
env = append(env, traceParentEnvVar+"="+c.TraceParent)
}
if c.TraceState != "" {
env = append(env, traceStateEnvVar+"="+c.TraceState)
}
return env
}
func PropagateFromEnvironment() *EnvironCarrier {
return &EnvironCarrier{
TraceParent: os.Getenv(traceParentEnvVar),
TraceState: os.Getenv(traceStateEnvVar),
}
}
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