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logging.go
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logging.go
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package utils
import (
"errors"
"fmt"
"io"
"net/url"
"os"
"path/filepath"
"runtime"
"strings"
logger "github.com/sirupsen/logrus"
)
type LogWriter struct {
logFile *os.File
}
func InitLogger() *LogWriter {
logger.SetOutput(io.Discard) // Send all logs to nowhere by default
logger.SetLevel(logger.TraceLevel)
logWriter := &LogWriter{}
outputLevel := getLogLevels(logger.InfoLevel)
if Config.Logging.OutputLevel != "" {
levelParts := strings.Split(Config.Logging.OutputLevel, "|")
if len(levelParts) > 1 {
outputLevel = []logger.Level{}
for _, level := range levelParts {
logLevel := parseLogLevel(level)
if logLevel != 9999 {
outputLevel = append(outputLevel, logLevel)
}
}
} else {
logLevel := parseLogLevel(levelParts[0])
if logLevel != 9999 {
outputLevel = getLogLevels(logLevel)
} else {
outputLevel = []logger.Level{}
}
}
}
if len(outputLevel) > 0 {
var writer io.Writer
if Config.Logging.OutputStderr {
writer = os.Stderr
} else {
writer = os.Stdout
}
logger.AddHook(&LogWriterHook{
Writer: writer,
LogLevels: outputLevel,
})
}
if Config.Logging.FilePath != "" {
fileLevel := getLogLevels(logger.InfoLevel)
if Config.Logging.FileLevel != "" {
levelParts := strings.Split(Config.Logging.FileLevel, "|")
if len(levelParts) > 1 {
fileLevel = []logger.Level{}
for _, level := range levelParts {
logLevel := parseLogLevel(level)
if logLevel != 9999 {
fileLevel = append(fileLevel, logLevel)
}
}
} else {
logLevel := parseLogLevel(levelParts[0])
if logLevel != 9999 {
fileLevel = getLogLevels(logLevel)
} else {
fileLevel = []logger.Level{}
}
}
}
fmt.Printf("logging to file: %v (%v)\n", Config.Logging.FilePath, fileLevel)
f, err := os.OpenFile(Config.Logging.FilePath, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
fmt.Println("Failed to create logfile" + Config.Logging.FilePath)
panic(err)
}
logWriter.logFile = f
logger.AddHook(&LogWriterHook{ // Send info and debug logs to stdout
Writer: f,
LogLevels: fileLevel,
})
}
return logWriter
}
func (logWriter *LogWriter) Dispose() {
if logWriter.logFile != nil {
logWriter.logFile.Close()
logWriter.logFile = nil
}
}
func getLogLevels(level logger.Level) []logger.Level {
if level == logger.TraceLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
logger.ErrorLevel,
logger.WarnLevel,
logger.InfoLevel,
logger.DebugLevel,
logger.TraceLevel,
}
} else if level == logger.DebugLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
logger.ErrorLevel,
logger.WarnLevel,
logger.InfoLevel,
logger.DebugLevel,
}
} else if level == logger.InfoLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
logger.ErrorLevel,
logger.WarnLevel,
logger.InfoLevel,
}
} else if level == logger.WarnLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
logger.ErrorLevel,
logger.WarnLevel,
}
} else if level == logger.ErrorLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
logger.ErrorLevel,
}
} else if level == logger.FatalLevel {
return []logger.Level{
logger.PanicLevel,
logger.FatalLevel,
}
} else if level == logger.PanicLevel {
return []logger.Level{
logger.PanicLevel,
}
} else {
return []logger.Level{}
}
}
func parseLogLevel(level string) logger.Level {
switch level {
case "trace":
return logger.TraceLevel
case "debug":
return logger.DebugLevel
case "info":
return logger.InfoLevel
case "warn":
return logger.WarnLevel
case "error":
return logger.ErrorLevel
case "fatal":
return logger.FatalLevel
case "panic":
return logger.PanicLevel
case "none":
return 9999
}
return 0
}
// WriterHook is a hook that writes logs of specified LogLevels to specified Writer
type LogWriterHook struct {
Writer io.Writer
LogLevels []logger.Level
}
// Fire will be called when some logging function is called with current hook
// It will format log entry to string and write it to appropriate writer
func (hook *LogWriterHook) Fire(entry *logger.Entry) error {
line, err := entry.String()
if err != nil {
return err
}
_, err = hook.Writer.Write([]byte(line))
return err
}
func (hook *LogWriterHook) Levels() []logger.Level {
return hook.LogLevels
}
// LogFatal logs a fatal error with callstack info that skips callerSkip many levels with arbitrarily many additional infos.
// callerSkip equal to 0 gives you info directly where LogFatal is called.
func LogFatal(err error, errorMsg interface{}, callerSkip int, additionalInfos ...map[string]interface{}) {
logErrorInfo(err, callerSkip, additionalInfos...).Fatal(errorMsg)
}
// LogError logs an error with callstack info that skips callerSkip many levels with arbitrarily many additional infos.
// callerSkip equal to 0 gives you info directly where LogError is called.
func LogError(err error, errorMsg interface{}, callerSkip int, additionalInfos ...map[string]interface{}) {
logErrorInfo(err, callerSkip, additionalInfos...).Error(errorMsg)
}
func logErrorInfo(err error, callerSkip int, additionalInfos ...map[string]interface{}) *logger.Entry {
logFields := logger.NewEntry(logger.New())
pc, fullFilePath, line, ok := runtime.Caller(callerSkip + 2)
if ok {
logFields = logFields.WithFields(logger.Fields{
"_file": filepath.Base(fullFilePath),
"_function": runtime.FuncForPC(pc).Name(),
"_line": line,
})
} else {
logFields = logFields.WithField("runtime", "Callstack cannot be read")
}
errColl := []string{}
for {
errColl = append(errColl, fmt.Sprint(err))
nextErr := errors.Unwrap(err)
if nextErr != nil {
err = nextErr
} else {
break
}
}
errMarkSign := "~"
for idx := 0; idx < (len(errColl) - 1); idx++ {
errInfoText := fmt.Sprintf("%serrInfo_%v%s", errMarkSign, idx, errMarkSign)
nextErrInfoText := fmt.Sprintf("%serrInfo_%v%s", errMarkSign, idx+1, errMarkSign)
if idx == (len(errColl) - 2) {
nextErrInfoText = fmt.Sprintf("%serror%s", errMarkSign, errMarkSign)
}
// Replace the last occurrence of the next error in the current error
lastIdx := strings.LastIndex(errColl[idx], errColl[idx+1])
if lastIdx != -1 {
errColl[idx] = errColl[idx][:lastIdx] + nextErrInfoText + errColl[idx][lastIdx+len(errColl[idx+1]):]
}
errInfoText = strings.ReplaceAll(errInfoText, errMarkSign, "")
logFields = logFields.WithField(errInfoText, errColl[idx])
}
if err != nil {
logFields = logFields.WithField("errType", fmt.Sprintf("%T", err)).WithError(err)
}
for _, infoMap := range additionalInfos {
for name, info := range infoMap {
logFields = logFields.WithField(name, info)
}
}
return logFields
}
func GetRedactedUrl(requrl string) string {
urlData, _ := url.Parse(requrl)
var logurl string
if urlData != nil {
logurl = urlData.Redacted()
} else {
logurl = requrl
}
return logurl
}