/
context.go
80 lines (72 loc) · 2.54 KB
/
context.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package ulog
import (
"context"
"fmt"
opentracing "github.com/opentracing/opentracing-go"
jaeger "github.com/uber/jaeger-client-go"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// Logger returns a *zap.Logger that's pre-seeded with tracing information from
// the provided context.
func Logger(ctx context.Context) *zap.Logger {
if ctx == nil {
return zap.L()
}
return zap.L().With(Trace(ctx))
}
// Sugar retrieves a loosely-typed zap.SugaredLogger from the provided context.
func Sugar(ctx context.Context) *zap.SugaredLogger {
return Logger(ctx).Sugar()
}
// Trace creates a field that extracts tracing information from a context
// (including trace, span, and parent IDs) and includes it under the "trace"
// key.
//
// Because the opentracing APIs don't expose this information, the returned
// zap.Field is a no-op for contexts that don't contain a span or contain a
// non-Jaeger span.
func Trace(ctx context.Context) zapcore.Field {
if ctx == nil {
return zap.Skip()
}
return zap.Object("trace", trace{ctx})
}
type trace struct {
ctx context.Context
}
func (t trace) MarshalLogObject(enc zapcore.ObjectEncoder) error {
span := opentracing.SpanFromContext(t.ctx)
if span == nil {
return nil
}
j, ok := span.Context().(jaeger.SpanContext)
if !ok {
return nil
}
if !j.IsValid() {
return fmt.Errorf("invalid span: %v", j.SpanID())
}
enc.AddString("span", j.SpanID().String())
enc.AddString("trace", j.TraceID().String())
return nil
}