Source: prefixLogger.go in package google.golang.org/grpc/internal/grpclog

* * Copyright 2020 gRPC authors. * * 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 grpclog

import (
	"fmt"
)

PrefixLogger does logging with a prefix. Logging method on a nil logs without any prefix.

type PrefixLogger struct {
	logger DepthLoggerV2
	prefix string
}

Infof does info logging.

func (pl *PrefixLogger) Infof(format string, args ...interface{}) {

Handle nil, so the tests can pass in a nil logger.

		format = pl.prefix + format
		pl.logger.InfoDepth(1, fmt.Sprintf(format, args...))
		return
	}
	InfoDepth(1, fmt.Sprintf(format, args...))
}

Warningf does warning logging.

func (pl *PrefixLogger) Warningf(format string, args ...interface{}) {
	if pl != nil {
		format = pl.prefix + format
		pl.logger.WarningDepth(1, fmt.Sprintf(format, args...))
		return
	}
	WarningDepth(1, fmt.Sprintf(format, args...))
}

Errorf does error logging.

func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
	if pl != nil {
		format = pl.prefix + format
		pl.logger.ErrorDepth(1, fmt.Sprintf(format, args...))
		return
	}
	ErrorDepth(1, fmt.Sprintf(format, args...))
}

Debugf does info logging at verbose level 2.

func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
	if !Logger.V(2) {
		return
	}

Handle nil, so the tests can pass in a nil logger.

		format = pl.prefix + format
		pl.logger.InfoDepth(1, fmt.Sprintf(format, args...))
		return
	}
	InfoDepth(1, fmt.Sprintf(format, args...))
}

NewPrefixLogger creates a prefix logger with the given prefix.

func NewPrefixLogger(logger DepthLoggerV2, prefix string) *PrefixLogger {
	return &PrefixLogger{logger: logger, prefix: prefix}