Mercurial > gemma

annotate pkg/log/log.go @ 5688:6281c18b109f sr-v2

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Finsh serializing v2 meshes.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 12 Feb 2024 02:27:41 +0100
parents 1222b777f51f
children 2dd155cc95ec
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2021 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package log
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15
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16 import (
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17 "fmt"
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18 lg "log"
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19 "os"
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20 "strings"
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21 "sync"
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22 "sync/atomic"
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23 )
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24
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25 // Level is an enumeration symbolizing a log level.
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26 type Level uint32
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27
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28 const (
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29 // TraceLogLevel is the TRACE log level.
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30 TraceLogLevel = Level(iota)
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31 // DebugLogLevel is the DEBUG log level.
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32 DebugLogLevel
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33 // InfoLogLevel is the INFO log level.
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34 InfoLogLevel
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35 // WarnLogLevel is the WARN log level.
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36 WarnLogLevel
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37 // ErrorLogLevel is the ERROR log level.
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38 ErrorLogLevel
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39 // FatalLogLevel is the FATAL log level.
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40 FatalLogLevel
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41 )
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42
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43 var (
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44 logLevel = uint32(InfoLogLevel)
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45 logFileMu sync.Mutex
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46 logFile *os.File
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47 )
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48
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49 func init() {
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50 lg.SetFlags(lg.LstdFlags | lg.Lshortfile)
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51 }
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52
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53 const callDepth = 2
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54
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55 // SetupLog redirects the log output to a given file.
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56 // The file is opened in append mode with the given
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57 // permisssions. A previously opened log file will
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58 // be closed.
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59 func SetupLog(filename string, perm os.FileMode) error {
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60 f, err := os.OpenFile(filename, os.O_APPEND|os.O_CREATE|os.O_WRONLY, perm)
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61 if err != nil {
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62 return err
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63 }
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64 logFileMu.Lock()
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65 defer logFileMu.Unlock()
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66 if logFile != nil {
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67 logFile.Close()
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68 }
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69 logFile = f
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70 lg.SetOutput(logFile)
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71 return nil
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72 }
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73
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74 // ShutdownLog closes an open log file (if there is any in use)
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75 // and redirects the output to stderr.
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76 func ShutdownLog() {
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77 logFileMu.Lock()
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78 defer logFileMu.Unlock()
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79 if logFile != nil {
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80 logFile.Close()
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81 logFile = nil
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82 }
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83 lg.SetOutput(os.Stderr)
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84 }
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85
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86 // ParseLogLevel converts a strings representation
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87 // of a log level to the reprective log level.
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88 // If the log level is unknown InfoLogLevel is
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89 // returned.
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90 func ParseLogLevel(s string) Level {
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91 switch strings.ToLower(s) {
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92 case "trace":
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93 return TraceLogLevel
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94 case "debug":
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95 return DebugLogLevel
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96 case "info":
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97 return InfoLogLevel
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98 case "warn":
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99 return WarnLogLevel
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100 case "error":
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101 return ErrorLogLevel
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102 case "fatal":
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103 return FatalLogLevel
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104 default:
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105 return InfoLogLevel
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106 }
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107 }
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108
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109 // String implements the fmt.Stringer interface.
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110 func (level Level) String() string {
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111 switch level {
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112 case TraceLogLevel:
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113 return "trace"
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114 case DebugLogLevel:
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115 return "debug"
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116 case InfoLogLevel:
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117 return "info"
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118 case WarnLogLevel:
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119 return "warn"
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120 case ErrorLogLevel:
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121 return "error"
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122 case FatalLogLevel:
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123 return "fatal"
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124 default:
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125 return "unknown"
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126 }
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127 }
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128
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129 // GetLogLevel returns the currently active log level.
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130 func GetLogLevel() Level {
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131 return Level(atomic.LoadUint32(&logLevel))
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132 }
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133
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134 // SetLogLevel sets the log level to be active.
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135 func SetLogLevel(level Level) {
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136 atomic.StoreUint32(&logLevel, uint32(level))
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137 }
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138
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139 // Tracef formats a log message as a TRACE output.
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140 func Tracef(f string, args ...interface{}) {
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141 if TraceLogLevel >= GetLogLevel() {
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142 s := fmt.Sprintf(f, args...)
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143 lg.Output(callDepth, "[TRACE] "+s)
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144 }
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145 }
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146
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147 // Traceln line prints a log message as a TRACE output.
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148 func Traceln(s string) {
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149 if TraceLogLevel >= GetLogLevel() {
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150 lg.Output(callDepth, "[TRACE] "+s)
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151 }
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152 }
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153
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154 // Debugf formats a log message as a DEBUG output.
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155 func Debugf(f string, args ...interface{}) {
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156 if DebugLogLevel >= GetLogLevel() {
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157 s := fmt.Sprintf(f, args...)
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158 lg.Output(callDepth, "[DEBUG] "+s)
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159 }
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160 }
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161
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162 // Debugln line prints a log message as a DEBUG output.
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163 func Debugln(s string) {
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164 if DebugLogLevel >= GetLogLevel() {
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165 lg.Output(callDepth, "[DEBUG] "+s)
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166 }
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167 }
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168
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169 // Infof formats a log message as a INFO output.
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170 func Infof(f string, args ...interface{}) {
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171 if InfoLogLevel >= GetLogLevel() {
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172 s := fmt.Sprintf(f, args...)
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173 lg.Output(callDepth, "[INFO] "+s)
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174 }
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175 }
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176
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177 // Infoln line prints a log message as a INFO output.
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178 func Infoln(s string) {
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179 if InfoLogLevel >= GetLogLevel() {
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180 lg.Output(callDepth, "[INFO] "+s)
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181 }
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182 }
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183
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184 // Warnf formats a log message as a WARN output.
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185 func Warnf(f string, args ...interface{}) {
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186 if WarnLogLevel >= GetLogLevel() {
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187 s := fmt.Sprintf(f, args...)
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188 lg.Output(callDepth, "[WARN] "+s)
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189 }
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190 }
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191
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192 // Warnln line prints a log message as a WARN output.
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193 func Warnln(s string) {
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194 if WarnLogLevel >= GetLogLevel() {
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195 lg.Output(callDepth, "[WARN] "+s)
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196 }
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197 }
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198
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199 // Errorf formats a log message as an ERROR output.
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200 func Errorf(f string, args ...interface{}) {
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201 if ErrorLogLevel >= GetLogLevel() {
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202 s := fmt.Sprintf(f, args...)
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203 lg.Output(callDepth, "[ERROR] "+s)
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204 }
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205 }
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206
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207 // Errorln line prints a log message as an ERROR output.
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208 func Errorln(s string) {
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209 if ErrorLogLevel >= GetLogLevel() {
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210 lg.Output(callDepth, "[ERROR] "+s)
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211 }
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212 }
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213
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214 // Fatalf formats a log message as a FATAL output
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215 // and terminates the programs with an error code (1).
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216 func Fatalf(f string, args ...interface{}) {
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217 if FatalLogLevel >= GetLogLevel() {
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218 s := fmt.Sprintf(f, args...)
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219 lg.Output(callDepth, "[FATAL] "+s)
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220 os.Exit(1)
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221 }
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222 }
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223
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224 // Fatalln line prints a log message as a FATAL output
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225 // and terminates the programs with an error code (1).
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226 func Fatalln(s string) {
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227 if FatalLogLevel >= GetLogLevel() {
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228 lg.Output(callDepth, "[FATAL] "+s)
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229 os.Exit(1)
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230 }
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231 }
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232
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233 // Panicf formats a log message as a PANIC output
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234 // and throws a panic.
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235 func Panicf(f string, args ...interface{}) {
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236 s := fmt.Sprintf(f, args...)
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237 lg.Output(callDepth, "[PANIC] "+s)
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238 panic(s)
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239 }
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240
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241 // Panicln line prints a log message as a PANIC output
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242 // and throws a panic.
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243 func Panicln(s string) {
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244 lg.Output(callDepth, "[PANIC] "+s)
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245 panic(s)
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246 }