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64 lines
2.1 KiB
Go
64 lines
2.1 KiB
Go
// Copyright 2025 sigma
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package logger
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import (
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"context"
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"log/slog"
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"go.opentelemetry.io/otel/trace"
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)
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// TraceKey is the attribute name under which the trace id is recorded.
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const TraceKey = "trace_id"
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// traceHandler wraps a slog.Handler and adds the OpenTelemetry trace id
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// from the request context to every log record that has one.
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type traceHandler struct {
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inner slog.Handler
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}
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// NewTraceHandler wraps the given handler so that the trace id carried in
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// the logging context (if any) is added to each record.
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func NewTraceHandler(h slog.Handler) slog.Handler {
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return &traceHandler{inner: h}
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}
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// Enabled reports whether the handler will process records at the given level.
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func (h *traceHandler) Enabled(ctx context.Context, level slog.Level) bool {
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return h.inner.Enabled(ctx, level)
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}
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// Handle extracts the trace id from ctx and attaches it to the record
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// before delegating to the wrapped handler.
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func (h *traceHandler) Handle(ctx context.Context, record slog.Record) error {
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sc := trace.SpanContextFromContext(ctx)
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if sc.HasTraceID() {
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record.AddAttrs(slog.String(TraceKey, sc.TraceID().String()))
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}
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return h.inner.Handle(ctx, record)
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}
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// WithAttrs returns a new handler whose attributes consist of both the
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// receiver's attributes and the argument list.
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func (h *traceHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
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return &traceHandler{inner: h.inner.WithAttrs(attrs)}
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}
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// WithGroup returns a handler with the given group appended to existing groups.
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func (h *traceHandler) WithGroup(name string) slog.Handler {
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return &traceHandler{inner: h.inner.WithGroup(name)}
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}
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