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factory.go
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factory.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package log
import (
"context"
ot "github.com/opentracing/opentracing-go"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// Factory is the default logging wrapper that can create
// logger instances either for a given Context or context-less.
type Factory struct {
logger *zap.Logger
}
// NewFactory creates a new Factory.
func NewFactory(logger *zap.Logger) Factory {
return Factory{logger: logger}
}
// Bg creates a context-unaware logger.
func (b Factory) Bg() Logger {
return wrapper(b)
}
// For returns a context-aware Logger. If the context
// contains an OpenTracing span, all logging calls are also
// echo-ed into the span.
func (b Factory) For(ctx context.Context) Logger {
if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
logger := spanLogger{span: otSpan, logger: b.logger}
if otelSpan := trace.SpanFromContext(ctx); otelSpan != nil {
logger.spanFields = []zapcore.Field{
zap.String("trace_id", otelSpan.SpanContext().TraceID().String()),
zap.String("span_id", otelSpan.SpanContext().SpanID().String()),
}
}
return logger
}
return b.Bg()
}
// With creates a child logger, and optionally adds some context fields to that logger.
func (b Factory) With(fields ...zapcore.Field) Factory {
return Factory{logger: b.logger.With(fields...)}
}