vendor/google.golang.org/grpc/internal/binarylog/env_config.go

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/*
 *
 * Copyright 2018 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 binarylog

import (
	"errors"
	"fmt"
	"regexp"
	"strconv"
	"strings"

	"google.golang.org/grpc/grpclog"
)

// NewLoggerFromConfigString reads the string and build a logger. It can be used
// to build a new logger and assign it to binarylog.Logger.
//
// Example filter config strings:
//  - "" Nothing will be logged
//  - "*" All headers and messages will be fully logged.
//  - "*{h}" Only headers will be logged.
//  - "*{m:256}" Only the first 256 bytes of each message will be logged.
//  - "Foo/*" Logs every method in service Foo
//  - "Foo/*,-Foo/Bar" Logs every method in service Foo except method /Foo/Bar
//  - "Foo/*,Foo/Bar{m:256}" Logs the first 256 bytes of each message in method
//    /Foo/Bar, logs all headers and messages in every other method in service
//    Foo.
//
// If two configs exist for one certain method or service, the one specified
// later overrides the privous config.
func NewLoggerFromConfigString(s string) Logger {
	if s == "" {
		return nil
	}
	l := newEmptyLogger()
	methods := strings.Split(s, ",")
	for _, method := range methods {
		if err := l.fillMethodLoggerWithConfigString(method); err != nil {
			grpclog.Warningf("failed to parse binary log config: %v", err)
			return nil
		}
	}
	return l
}