260 lines
8.2 KiB
Go
260 lines
8.2 KiB
Go
/*
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*
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* Copyright 2017 gRPC authors.
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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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*
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*/
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package grpclog
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import (
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"strconv"
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"strings"
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"google.golang.org/grpc/internal/grpclog"
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)
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// LoggerV2 does underlying logging work for grpclog.
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type LoggerV2 interface {
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// Info logs to INFO log. Arguments are handled in the manner of fmt.Print.
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Info(args ...interface{})
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// Infoln logs to INFO log. Arguments are handled in the manner of fmt.Println.
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Infoln(args ...interface{})
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// Infof logs to INFO log. Arguments are handled in the manner of fmt.Printf.
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Infof(format string, args ...interface{})
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// Warning logs to WARNING log. Arguments are handled in the manner of fmt.Print.
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Warning(args ...interface{})
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// Warningln logs to WARNING log. Arguments are handled in the manner of fmt.Println.
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Warningln(args ...interface{})
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// Warningf logs to WARNING log. Arguments are handled in the manner of fmt.Printf.
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Warningf(format string, args ...interface{})
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// Error logs to ERROR log. Arguments are handled in the manner of fmt.Print.
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Error(args ...interface{})
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// Errorln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
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Errorln(args ...interface{})
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// Errorf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
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Errorf(format string, args ...interface{})
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// Fatal logs to ERROR log. Arguments are handled in the manner of fmt.Print.
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// gRPC ensures that all Fatal logs will exit with os.Exit(1).
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// Implementations may also call os.Exit() with a non-zero exit code.
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Fatal(args ...interface{})
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// Fatalln logs to ERROR log. Arguments are handled in the manner of fmt.Println.
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// gRPC ensures that all Fatal logs will exit with os.Exit(1).
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// Implementations may also call os.Exit() with a non-zero exit code.
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Fatalln(args ...interface{})
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// Fatalf logs to ERROR log. Arguments are handled in the manner of fmt.Printf.
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// gRPC ensures that all Fatal logs will exit with os.Exit(1).
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// Implementations may also call os.Exit() with a non-zero exit code.
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Fatalf(format string, args ...interface{})
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// V reports whether verbosity level l is at least the requested verbose level.
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V(l int) bool
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}
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// SetLoggerV2 sets logger that is used in grpc to a V2 logger.
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// Not mutex-protected, should be called before any gRPC functions.
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func SetLoggerV2(l LoggerV2) {
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if _, ok := l.(*componentData); ok {
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panic("cannot use component logger as grpclog logger")
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}
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grpclog.Logger = l
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grpclog.DepthLogger, _ = l.(grpclog.DepthLoggerV2)
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}
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const (
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// infoLog indicates Info severity.
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infoLog int = iota
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// warningLog indicates Warning severity.
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warningLog
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// errorLog indicates Error severity.
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errorLog
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// fatalLog indicates Fatal severity.
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fatalLog
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)
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// severityName contains the string representation of each severity.
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var severityName = []string{
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infoLog: "INFO",
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warningLog: "WARNING",
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errorLog: "ERROR",
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fatalLog: "FATAL",
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}
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// loggerT is the default logger used by grpclog.
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type loggerT struct {
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m []*log.Logger
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v int
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jsonFormat bool
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}
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// NewLoggerV2 creates a loggerV2 with the provided writers.
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// Fatal logs will be written to errorW, warningW, infoW, followed by exit(1).
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// Error logs will be written to errorW, warningW and infoW.
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// Warning logs will be written to warningW and infoW.
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// Info logs will be written to infoW.
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func NewLoggerV2(infoW, warningW, errorW io.Writer) LoggerV2 {
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return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{})
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}
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// NewLoggerV2WithVerbosity creates a loggerV2 with the provided writers and
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// verbosity level.
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func NewLoggerV2WithVerbosity(infoW, warningW, errorW io.Writer, v int) LoggerV2 {
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return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{verbose: v})
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}
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type loggerV2Config struct {
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verbose int
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jsonFormat bool
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}
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func newLoggerV2WithConfig(infoW, warningW, errorW io.Writer, c loggerV2Config) LoggerV2 {
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var m []*log.Logger
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flag := log.LstdFlags
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if c.jsonFormat {
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flag = 0
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}
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m = append(m, log.New(infoW, "", flag))
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m = append(m, log.New(io.MultiWriter(infoW, warningW), "", flag))
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ew := io.MultiWriter(infoW, warningW, errorW) // ew will be used for error and fatal.
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m = append(m, log.New(ew, "", flag))
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m = append(m, log.New(ew, "", flag))
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return &loggerT{m: m, v: c.verbose, jsonFormat: c.jsonFormat}
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}
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// newLoggerV2 creates a loggerV2 to be used as default logger.
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// All logs are written to stderr.
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func newLoggerV2() LoggerV2 {
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errorW := ioutil.Discard
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warningW := ioutil.Discard
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infoW := ioutil.Discard
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logLevel := os.Getenv("GRPC_GO_LOG_SEVERITY_LEVEL")
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switch logLevel {
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case "", "ERROR", "error": // If env is unset, set level to ERROR.
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errorW = os.Stderr
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case "WARNING", "warning":
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warningW = os.Stderr
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case "INFO", "info":
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infoW = os.Stderr
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}
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var v int
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vLevel := os.Getenv("GRPC_GO_LOG_VERBOSITY_LEVEL")
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if vl, err := strconv.Atoi(vLevel); err == nil {
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v = vl
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}
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jsonFormat := strings.EqualFold(os.Getenv("GRPC_GO_LOG_FORMATTER"), "json")
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return newLoggerV2WithConfig(infoW, warningW, errorW, loggerV2Config{
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verbose: v,
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jsonFormat: jsonFormat,
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})
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}
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func (g *loggerT) output(severity int, s string) {
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sevStr := severityName[severity]
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if !g.jsonFormat {
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g.m[severity].Output(2, fmt.Sprintf("%v: %v", sevStr, s))
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return
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}
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// TODO: we can also include the logging component, but that needs more
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// (API) changes.
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b, _ := json.Marshal(map[string]string{
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"severity": sevStr,
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"message": s,
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})
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g.m[severity].Output(2, string(b))
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}
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func (g *loggerT) Info(args ...interface{}) {
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g.output(infoLog, fmt.Sprint(args...))
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}
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func (g *loggerT) Infoln(args ...interface{}) {
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g.output(infoLog, fmt.Sprintln(args...))
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}
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func (g *loggerT) Infof(format string, args ...interface{}) {
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g.output(infoLog, fmt.Sprintf(format, args...))
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}
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func (g *loggerT) Warning(args ...interface{}) {
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g.output(warningLog, fmt.Sprint(args...))
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}
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func (g *loggerT) Warningln(args ...interface{}) {
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g.output(warningLog, fmt.Sprintln(args...))
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}
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func (g *loggerT) Warningf(format string, args ...interface{}) {
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g.output(warningLog, fmt.Sprintf(format, args...))
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}
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func (g *loggerT) Error(args ...interface{}) {
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g.output(errorLog, fmt.Sprint(args...))
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}
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func (g *loggerT) Errorln(args ...interface{}) {
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g.output(errorLog, fmt.Sprintln(args...))
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}
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func (g *loggerT) Errorf(format string, args ...interface{}) {
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g.output(errorLog, fmt.Sprintf(format, args...))
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}
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func (g *loggerT) Fatal(args ...interface{}) {
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g.output(fatalLog, fmt.Sprint(args...))
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os.Exit(1)
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}
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func (g *loggerT) Fatalln(args ...interface{}) {
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g.output(fatalLog, fmt.Sprintln(args...))
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os.Exit(1)
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}
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func (g *loggerT) Fatalf(format string, args ...interface{}) {
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g.output(fatalLog, fmt.Sprintf(format, args...))
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os.Exit(1)
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}
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func (g *loggerT) V(l int) bool {
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return l <= g.v
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}
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// DepthLoggerV2 logs at a specified call frame. If a LoggerV2 also implements
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// DepthLoggerV2, the below functions will be called with the appropriate stack
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// depth set for trivial functions the logger may ignore.
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//
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// Experimental
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//
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// Notice: This type is EXPERIMENTAL and may be changed or removed in a
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// later release.
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type DepthLoggerV2 interface {
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LoggerV2
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// InfoDepth logs to INFO log at the specified depth. Arguments are handled in the manner of fmt.Println.
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InfoDepth(depth int, args ...interface{})
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// WarningDepth logs to WARNING log at the specified depth. Arguments are handled in the manner of fmt.Println.
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WarningDepth(depth int, args ...interface{})
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// ErrorDepth logs to ERROR log at the specified depth. Arguments are handled in the manner of fmt.Println.
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ErrorDepth(depth int, args ...interface{})
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// FatalDepth logs to FATAL log at the specified depth. Arguments are handled in the manner of fmt.Println.
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FatalDepth(depth int, args ...interface{})
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}
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