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minio/cmd/logger.go

107 lines
3.0 KiB

/*
* Minio Cloud Storage, (C) 2015, 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"bufio"
"bytes"
"fmt"
"path/filepath"
"runtime"
"runtime/debug"
"strings"
"github.com/Sirupsen/logrus"
)
type fields map[string]interface{}
var log = logrus.New() // Default console logger.
// logger carries logging configuration for various supported loggers.
// Currently supported loggers are
//
// - console [default]
// - file
// - syslog
type logger struct {
Console consoleLogger `json:"console"`
File fileLogger `json:"file"`
Syslog syslogLogger `json:"syslog"`
// Add new loggers here.
}
// Function takes input with the results from runtime.Caller(1). Depending on the boolean.
// This function can either returned a shotFile form or a longFile form.
func funcFromPC(pc uintptr, file string, line int, shortFile bool) string {
var fn, name string
if shortFile {
fn = strings.Replace(file, filepath.ToSlash(GOPATH)+"/src/github.com/minio/minio/cmd/", "", -1)
name = strings.Replace(runtime.FuncForPC(pc).Name(), "github.com/minio/minio/cmd.", "", -1)
} else {
fn = strings.Replace(file, filepath.ToSlash(GOPATH)+"/src/", "", -1)
name = strings.Replace(runtime.FuncForPC(pc).Name(), "github.com/minio/minio/cmd.", "", -1)
}
return fmt.Sprintf("%s [%s:%d]", name, fn, line)
}
// stackInfo returns printable stack trace.
func stackInfo() string {
// Convert stack-trace bytes to io.Reader.
rawStack := bufio.NewReader(bytes.NewBuffer(debug.Stack()))
// Skip stack trace lines until our real caller.
for i := 0; i <= 4; i++ {
rawStack.ReadLine()
}
// Read the rest of useful stack trace.
stackBuf := new(bytes.Buffer)
stackBuf.ReadFrom(rawStack)
// Strip GOPATH of the build system and return.
return strings.Replace(stackBuf.String(), filepath.ToSlash(GOPATH)+"/src/", "", -1)
}
// errorIf synonymous with fatalIf but doesn't exit on error != nil
func errorIf(err error, msg string, data ...interface{}) {
if err == nil {
return
}
fields := logrus.Fields{
"cause": err.Error(),
}
if e, ok := err.(*Error); ok {
fields["stack"] = strings.Join(e.Trace(), " ")
}
log.WithFields(fields).Errorf(msg, data...)
}
// fatalIf wrapper function which takes error and prints jsonic error messages.
func fatalIf(err error, msg string, data ...interface{}) {
if err == nil {
return
}
fields := logrus.Fields{
"cause": err.Error(),
}
if globalTrace {
fields["stack"] = "\n" + stackInfo()
}
log.WithFields(fields).Fatalf(msg, data...)
}