139 lines
3.3 KiB
Go
139 lines
3.3 KiB
Go
// Package log provides logging for rclone
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package log
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import (
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"io"
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"log"
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"os"
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"reflect"
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"runtime"
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"strings"
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"github.com/rclone/rclone/fs"
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)
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// Options contains options for the remote control server
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type Options struct {
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File string // Log everything to this file
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Format string // Comma separated list of log format options
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UseSyslog bool // Use Syslog for logging
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SyslogFacility string // Facility for syslog, eg KERN,USER,...
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}
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// DefaultOpt is the default values used for Opt
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var DefaultOpt = Options{
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Format: "date,time",
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SyslogFacility: "DAEMON",
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}
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// Opt is the options for the logger
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var Opt = DefaultOpt
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// fnName returns the name of the calling +2 function
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func fnName() string {
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pc, _, _, ok := runtime.Caller(2)
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name := "*Unknown*"
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if ok {
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name = runtime.FuncForPC(pc).Name()
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dot := strings.LastIndex(name, ".")
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if dot >= 0 {
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name = name[dot+1:]
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}
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}
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return name
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}
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// Trace debugs the entry and exit of the calling function
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//
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// It is designed to be used in a defer statement so it returns a
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// function that logs the exit parameters.
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//
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// Any pointers in the exit function will be dereferenced
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func Trace(o interface{}, format string, a ...interface{}) func(string, ...interface{}) {
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if fs.Config.LogLevel < fs.LogLevelDebug {
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return func(format string, a ...interface{}) {}
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}
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name := fnName()
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fs.LogPrintf(fs.LogLevelDebug, o, name+": "+format, a...)
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return func(format string, a ...interface{}) {
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for i := range a {
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// read the values of the pointed to items
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typ := reflect.TypeOf(a[i])
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if typ.Kind() == reflect.Ptr {
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value := reflect.ValueOf(a[i])
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if value.IsNil() {
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a[i] = nil
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} else {
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pointedToValue := reflect.Indirect(value)
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a[i] = pointedToValue.Interface()
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}
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}
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}
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fs.LogPrintf(fs.LogLevelDebug, o, ">"+name+": "+format, a...)
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}
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}
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// Stack logs a stack trace of callers with the o and info passed in
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func Stack(o interface{}, info string) {
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if fs.Config.LogLevel < fs.LogLevelDebug {
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return
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}
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arr := [16 * 1024]byte{}
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buf := arr[:]
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n := runtime.Stack(buf, false)
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buf = buf[:n]
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fs.LogPrintf(fs.LogLevelDebug, o, "%s\nStack trace:\n%s", info, buf)
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}
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// InitLogging start the logging as per the command line flags
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func InitLogging() {
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flagsStr := "," + Opt.Format + ","
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var flags int
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if strings.Contains(flagsStr, ",date,") {
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flags |= log.Ldate
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}
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if strings.Contains(flagsStr, ",time,") {
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flags |= log.Ltime
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}
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if strings.Contains(flagsStr, ",microseconds,") {
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flags |= log.Lmicroseconds
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}
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if strings.Contains(flagsStr, ",longfile,") {
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flags |= log.Llongfile
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}
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if strings.Contains(flagsStr, ",shortfile,") {
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flags |= log.Lshortfile
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}
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if strings.Contains(flagsStr, ",UTC,") {
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flags |= log.LUTC
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}
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log.SetFlags(flags)
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// Log file output
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if Opt.File != "" {
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f, err := os.OpenFile(Opt.File, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0640)
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if err != nil {
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log.Fatalf("Failed to open log file: %v", err)
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}
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_, err = f.Seek(0, io.SeekEnd)
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if err != nil {
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fs.Errorf(nil, "Failed to seek log file to end: %v", err)
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}
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log.SetOutput(f)
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redirectStderr(f)
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}
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// Syslog output
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if Opt.UseSyslog {
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if Opt.File != "" {
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log.Fatalf("Can't use --syslog and --log-file together")
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}
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startSysLog()
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}
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}
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// Redirected returns true if the log has been redirected from stdout
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func Redirected() bool {
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return Opt.UseSyslog || Opt.File != ""
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}
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