Ilia Denisov
46 lines
1.1 KiB
Go
46 lines
1.1 KiB
Go
// Package logging configures the Game Lobby Service process logger and
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// provides context-aware helpers for trace fields.
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package logging
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import (
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"context"
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"fmt"
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"log/slog"
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"os"
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"strings"
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"go.opentelemetry.io/otel/trace"
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)
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// New constructs the process-wide JSON logger from level.
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func New(level string) (*slog.Logger, error) {
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var slogLevel slog.Level
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if err := slogLevel.UnmarshalText([]byte(strings.TrimSpace(level))); err != nil {
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return nil, fmt.Errorf("build logger: %w", err)
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}
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return slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
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Level: slogLevel,
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})), nil
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}
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// TraceAttrsFromContext returns slog key-value pairs for the active
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// OpenTelemetry span when ctx carries a valid span context. The keys match
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// the frozen `lobby/README.md` §Observability log fields `trace_id` and
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// `span_id`.
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func TraceAttrsFromContext(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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spanContext := trace.SpanContextFromContext(ctx)
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if !spanContext.IsValid() {
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return nil
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}
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return []any{
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"trace_id", spanContext.TraceID().String(),
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"span_id", spanContext.SpanID().String(),
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}
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}
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