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package detect
import (
"context"
"os"
"github.com/moby/buildkit/util/appcontext"
"go.opentelemetry.io/otel/propagation"
)
const (
traceparentHeader = "traceparent"
tracestateHeader = "tracestate"
)
func init() {
appcontext.Register(initContext)
}
func initContext(ctx context.Context) context.Context {
// open-telemetry/opentelemetry-specification#740
parent := os.Getenv("TRACEPARENT")
state := os.Getenv("TRACESTATE")
if parent != "" {
tc := propagation.TraceContext{}
return tc.Extract(ctx, &textMap{parent: parent, state: state})
}
// 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
parent = os.Getenv("OTEL_TRACE_PARENT")
state = os.Getenv("OTEL_TRACE_STATE")
if parent == "" {
return ctx
}
tc := propagation.TraceContext{}
return tc.Extract(ctx, &textMap{parent: parent, state: state})
}
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) {
}
func (tm *textMap) Keys() []string {
return []string{traceparentHeader, tracestateHeader}
}
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