MovieNight/common/logging.go

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Go
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package common
import (
"fmt"
"io"
"log"
"os"
)
var loglevel LogLevel
type LogLevel string
const (
LLError LogLevel = "error" // only log errors
LLChat LogLevel = "chat" // log chat and commands
LLInfo LogLevel = "info" // log info messages (not quite debug, but not chat)
LLDebug LogLevel = "debug" // log everything
)
const (
logPrefixError string = "[ERROR] "
logPrefixChat string = "[CHAT] "
logPrefixInfo string = "[INFO] "
logPrefixDebug string = "[DEBUG] "
)
var (
logError *log.Logger
logChat *log.Logger
logInfo *log.Logger
logDebug *log.Logger
)
func SetupLogging(level LogLevel, file string) error {
switch level {
case LLDebug:
if file == "" {
logError = log.New(os.Stderr, logPrefixError, log.LstdFlags)
logChat = log.New(os.Stdout, logPrefixChat, log.LstdFlags)
logDebug = log.New(os.Stdout, logPrefixDebug, log.LstdFlags)
logInfo = log.New(os.Stdout, logPrefixInfo, log.LstdFlags)
} else {
f, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("Unable to open log file for writing: %s", err)
}
logError = log.New(io.MultiWriter(os.Stderr, f), logPrefixError, log.LstdFlags)
logChat = log.New(io.MultiWriter(os.Stdout, f), logPrefixChat, log.LstdFlags)
logInfo = log.New(io.MultiWriter(os.Stdout, f), logPrefixInfo, log.LstdFlags)
logDebug = log.New(io.MultiWriter(os.Stdout, f), logPrefixDebug, log.LstdFlags)
}
case LLChat:
logDebug = nil
if file == "" {
logError = log.New(os.Stderr, logPrefixError, log.LstdFlags)
logChat = log.New(os.Stdout, logPrefixChat, log.LstdFlags)
logInfo = log.New(os.Stdout, logPrefixInfo, log.LstdFlags)
} else {
f, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("Unable to open log file for writing: %s", err)
}
logError = log.New(io.MultiWriter(os.Stderr, f), logPrefixError, log.LstdFlags)
logChat = log.New(io.MultiWriter(os.Stdout, f), logPrefixChat, log.LstdFlags)
logInfo = log.New(io.MultiWriter(os.Stdout, f), logPrefixInfo, log.LstdFlags)
}
case LLInfo:
logDebug = nil
logChat = nil
if file == "" {
logError = log.New(os.Stderr, logPrefixError, log.LstdFlags)
logInfo = log.New(os.Stdout, logPrefixInfo, log.LstdFlags)
} else {
f, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("Unable to open log file for writing: %s", err)
}
logError = log.New(io.MultiWriter(os.Stderr, f), logPrefixError, log.LstdFlags)
logInfo = log.New(io.MultiWriter(os.Stdout, f), logPrefixInfo, log.LstdFlags)
}
// Default to error
default:
logChat = nil
logDebug = nil
logInfo = nil
if file == "" {
logError = log.New(os.Stderr, logPrefixError, log.LstdFlags)
} else {
f, err := os.OpenFile(file, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return fmt.Errorf("Unable to open log file for writing: %s", err)
}
logError = log.New(io.MultiWriter(os.Stderr, f), logPrefixError, log.LstdFlags)
}
}
return nil
}
func LogErrorf(format string, v ...interface{}) {
if logError == nil {
panic("Logging not setup!")
}
logError.Printf(format, v...)
}
func LogErrorln(v ...interface{}) {
if logError == nil {
panic("Logging not setup!")
}
logError.Println(v...)
}
func LogChatf(format string, v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging chat and commands is turned off.
if logChat == nil {
return
}
logChat.Printf(format, v...)
}
func LogChatln(v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging chat and commands is turned off.
if logChat == nil {
return
}
logChat.Println(v...)
}
func LogInfof(format string, v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging info is turned off.
if logInfo == nil {
return
}
logInfo.Printf(format, v...)
}
func LogInfoln(v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging info is turned off.
if logInfo == nil {
return
}
logInfo.Println(v...)
}
func LogDebugf(format string, v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging debug is turned off.
if logDebug == nil {
return
}
logDebug.Printf(format, v...)
}
func LogDebugln(v ...interface{}) {
// if logError isn't set to something, logging wasn't setup.
if logError == nil {
panic("Logging not setup!")
}
// logging debug is turned off.
if logDebug == nil {
return
}
logDebug.Println(v...)
}