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log.go
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log.go
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package log
import (
"fmt"
"io"
"os"
"runtime"
"strings"
)
type priority int
const (
errorFormat = "[%s] %s:%d %s\n"
logFormat = "[%s] %s\n"
fatal priority = iota
error
info
debug
)
// A common interface to access the Fatal method of
// both testing.B and testing.T.
type Fataler interface {
Fatal(args ...interface{})
}
func (p priority) String() string {
switch p {
case fatal:
return "fatal"
case error:
return "error"
case info:
return "info"
case debug:
return "debug"
}
return ""
}
// Debug function, if the debug flag is set, then display. Do nothing otherwise
// If Docker is in damon mode, also send the debug info on the socket
func Debugf(format string, a ...interface{}) {
if os.Getenv("DEBUG") != "" {
logf(os.Stderr, debug, format, a...)
}
}
func Infof(format string, a ...interface{}) {
logf(os.Stdout, info, format, a...)
}
func Errorf(format string, a ...interface{}) {
logf(os.Stderr, error, format, a...)
}
func Fatalf(format string, a ...interface{}) {
logf(os.Stderr, fatal, format, a...)
os.Exit(1)
}
func logf(stream io.Writer, level priority, format string, a ...interface{}) {
var prefix string
if level <= error || level == debug {
// Retrieve the stack infos
_, file, line, ok := runtime.Caller(2)
if !ok {
file = "<unknown>"
line = -1
} else {
file = file[strings.LastIndex(file, "/")+1:]
}
prefix = fmt.Sprintf(errorFormat, level.String(), file, line, format)
} else {
prefix = fmt.Sprintf(logFormat, level.String(), format)
}
fmt.Fprintf(stream, prefix, a...)
}