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// Copyright 2019 Google Inc. All Rights Reserved.
//
// 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 logger logs messages as appropriate.
package logger
import (
"fmt"
"path/filepath"
"runtime"
"strings"
"time"
logpb "google.golang.org/genproto/googleapis/logging/v2"
)
// Severity is the severity level of the log event.
type Severity int
// Log severity levels.
const (
Debug Severity = iota
Info
Warning
Error
Critical
)
var severityName = map[Severity]string{
Debug: "Debug",
Info: "Info",
Warning: "Warning",
Error: "Error",
Critical: "Critical",
}
func (v Severity) String() string {
s, ok := severityName[v]
if ok {
return s
}
return ""
}
// LogEntry encapsulates a single log entry.
type LogEntry struct {
Message string `json:"message"`
// If present, this will be set as Payload to Cloud Logging
// instead of Message and LocalTimeStamp.
//
// Note: Message is still sent to local logs.
StructuredPayload interface{} `json:"omitempty"`
Labels map[string]string `json:"-"`
CallDepth int `json:"-"`
Severity Severity `json:"-"`
// Source will be overwritten, do not set.
Source *logpb.LogEntrySourceLocation `json:"-"`
// LocalTimestamp will be overwritten, do not set.
LocalTimestamp string `json:"localTimestamp"`
}
func (e LogEntry) String() string {
if formatFunction != nil {
return formatFunction(e)
}
if e.Severity == Error || e.Severity == Critical {
// 2006-01-02T15:04:05.999999Z07:00 LoggerName ERROR file.go:82: This is a log message.
return fmt.Sprintf("%s %s %s %s:%d: %s", e.LocalTimestamp, loggerName, e.Severity, e.Source.File, e.Source.Line, e.Message)
}
// 2006-01-02T15:04:05.999999Z07:00 LoggerName INFO: This is a log message.
return fmt.Sprintf("%s %s %s: %s", e.LocalTimestamp, loggerName, e.Severity, e.Message)
}
func (e LogEntry) bytes() []byte {
return []byte(strings.TrimSpace(e.String()) + "\n")
}
func now() string {
// RFC3339 with milliseconds.
return time.Now().Format("2006-01-02T15:04:05.0000Z07:00")
}
func caller(depth int) *logpb.LogEntrySourceLocation {
depth = depth + 1
pc, file, line, ok := runtime.Caller(depth)
if !ok {
file = "???"
line = 0
}
return &logpb.LogEntrySourceLocation{File: filepath.Base(file), Line: int64(line), Function: runtime.FuncForPC(pc).Name()}
}
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