Ilia Denisov
44 lines
1.3 KiB
Go
44 lines
1.3 KiB
Go
package logging
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import "context"
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// requestIDKey is the unexported context key under which the HTTP layer
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// stores the request id propagated from the X-Request-Id header.
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type requestIDKey struct{}
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// WithRequestID returns a child context that carries requestID. An empty
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// requestID returns ctx unchanged so callers do not have to branch.
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func WithRequestID(ctx context.Context, requestID string) context.Context {
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if ctx == nil || requestID == "" {
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return ctx
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}
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return context.WithValue(ctx, requestIDKey{}, requestID)
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}
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// RequestIDFromContext returns the request id stored on ctx by
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// WithRequestID, or an empty string when no value is present.
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func RequestIDFromContext(ctx context.Context) string {
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if ctx == nil {
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return ""
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}
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value, _ := ctx.Value(requestIDKey{}).(string)
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return value
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}
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// ContextAttrs returns slog key-value pairs that materialise the frozen
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// `lobby/README.md` §Observability log fields `request_id`, `trace_id`,
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// and `span_id` from ctx. Pairs whose value is empty are omitted so logs
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// stay tight.
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func ContextAttrs(ctx context.Context) []any {
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if ctx == nil {
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return nil
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}
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var attrs []any
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if requestID := RequestIDFromContext(ctx); requestID != "" {
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attrs = append(attrs, "request_id", requestID)
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}
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attrs = append(attrs, TraceAttrsFromContext(ctx)...)
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return attrs
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}
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