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55 lines
1.1 KiB
Go
55 lines
1.1 KiB
Go
package detect
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import (
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"context"
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"os"
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"github.com/moby/buildkit/util/appcontext"
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"go.opentelemetry.io/otel/propagation"
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)
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const (
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traceparentHeader = "traceparent"
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tracestateHeader = "tracestate"
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)
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func init() {
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appcontext.Register(initContext)
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}
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func initContext(ctx context.Context) context.Context {
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// previously defined in https://github.com/open-telemetry/opentelemetry-swift/blob/4ea467ed4b881d7329bf2254ca7ed7f2d9d6e1eb/Sources/OpenTelemetrySdk/Trace/Propagation/EnvironmentContextPropagator.swift#L14-L15
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parent := os.Getenv("OTEL_TRACE_PARENT")
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state := os.Getenv("OTEL_TRACE_STATE")
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if parent == "" {
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return ctx
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}
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tc := propagation.TraceContext{}
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return tc.Extract(ctx, &textMap{parent: parent, state: state})
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}
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type textMap struct {
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parent string
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state string
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}
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func (tm *textMap) Get(key string) string {
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switch key {
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case traceparentHeader:
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return tm.parent
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case tracestateHeader:
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return tm.state
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default:
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return ""
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}
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}
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func (tm *textMap) Set(key string, value string) {
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}
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func (tm *textMap) Keys() []string {
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return []string{traceparentHeader, tracestateHeader}
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}
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