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/*
* Minio Cloud Storage, (C) 2015, 2016, 2017, 2018 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 logger
import (
"context"
"encoding/hex"
"fmt"
"go/build"
"hash"
"path/filepath"
"reflect"
"runtime"
"strings"
"time"
"github.com/minio/highwayhash"
"github.com/minio/minio-go/pkg/set"
"github.com/minio/minio/cmd/logger/message/log"
)
var (
// HighwayHash key for logging in anonymous mode
magicHighwayHash256Key = []byte("\x4b\xe7\x34\xfa\x8e\x23\x8a\xcd\x26\x3e\x83\xe6\xbb\x96\x85\x52\x04\x0f\x93\x5d\xa3\x9f\x44\x14\x97\xe0\x9d\x13\x22\xde\x36\xa0")
// HighwayHash hasher for logging in anonymous mode
loggerHighwayHasher hash.Hash
)
// Disable disables all logging, false by default. (used for "go test")
var Disable = false
// Level type
type Level int8
// Enumerated level types
const (
InformationLvl Level = iota + 1
ErrorLvl
FatalLvl
)
var trimStrings []string
// TimeFormat - logging time format.
const TimeFormat string = "15:04:05 MST 01/02/2006"
// List of error strings to be ignored by LogIf
const (
diskNotFoundError = "disk not found"
)
var matchingFuncNames = [...]string{
"http.HandlerFunc.ServeHTTP",
"cmd.serverMain",
"cmd.StartGateway",
"cmd.(*webAPIHandlers).ListBuckets",
"cmd.(*webAPIHandlers).MakeBucket",
"cmd.(*webAPIHandlers).DeleteBucket",
"cmd.(*webAPIHandlers).ListObjects",
"cmd.(*webAPIHandlers).RemoveObject",
"cmd.(*webAPIHandlers).Login",
"cmd.(*webAPIHandlers).GenerateAuth",
"cmd.(*webAPIHandlers).SetAuth",
"cmd.(*webAPIHandlers).GetAuth",
"cmd.(*webAPIHandlers).CreateURLToken",
"cmd.(*webAPIHandlers).Upload",
"cmd.(*webAPIHandlers).Download",
"cmd.(*webAPIHandlers).DownloadZip",
"cmd.(*webAPIHandlers).GetBucketPolicy",
"cmd.(*webAPIHandlers).ListAllBucketPolicies",
"cmd.(*webAPIHandlers).SetBucketPolicy",
"cmd.(*webAPIHandlers).PresignedGet",
"cmd.(*webAPIHandlers).ServerInfo",
"cmd.(*webAPIHandlers).StorageInfo",
// add more here ..
}
func (level Level) String() string {
var lvlStr string
switch level {
case InformationLvl:
lvlStr = "INFO"
case ErrorLvl:
lvlStr = "ERROR"
case FatalLvl:
lvlStr = "FATAL"
}
return lvlStr
}
// quietFlag: Hide startup messages if enabled
// jsonFlag: Display in JSON format, if enabled
var (
quietFlag, jsonFlag, anonFlag bool
// Custom function to format error
errorFmtFunc func(string, error, bool) string
)
// EnableQuiet - turns quiet option on.
func EnableQuiet() {
quietFlag = true
}
// EnableJSON - outputs logs in json format.
func EnableJSON() {
jsonFlag = true
quietFlag = true
}
// EnableAnonymous - turns anonymous flag
// to avoid printing sensitive information.
func EnableAnonymous() {
anonFlag = true
}
// IsJSON - returns true if jsonFlag is true
func IsJSON() bool {
return jsonFlag
}
// IsQuiet - returns true if quietFlag is true
func IsQuiet() bool {
return quietFlag
}
// RegisterUIError registers the specified rendering function. This latter
// will be called for a pretty rendering of fatal errors.
func RegisterUIError(f func(string, error, bool) string) {
errorFmtFunc = f
}
// Remove any duplicates and return unique entries.
func uniqueEntries(paths []string) []string {
m := make(set.StringSet)
for _, p := range paths {
if !m.Contains(p) {
m.Add(p)
}
}
return m.ToSlice()
}
// Init sets the trimStrings to possible GOPATHs
// and GOROOT directories. Also append github.com/minio/minio
// This is done to clean up the filename, when stack trace is
// displayed when an error happens.
func Init(goPath string, goRoot string) {
var goPathList []string
var goRootList []string
var defaultgoPathList []string
var defaultgoRootList []string
pathSeperator := ":"
// Add all possible GOPATH paths into trimStrings
// Split GOPATH depending on the OS type
if runtime.GOOS == "windows" {
pathSeperator = ";"
}
goPathList = strings.Split(goPath, pathSeperator)
goRootList = strings.Split(goRoot, pathSeperator)
defaultgoPathList = strings.Split(build.Default.GOPATH, pathSeperator)
defaultgoRootList = strings.Split(build.Default.GOROOT, pathSeperator)
// Add trim string "{GOROOT}/src/" into trimStrings
trimStrings = []string{filepath.Join(runtime.GOROOT(), "src") + string(filepath.Separator)}
// Add all possible path from GOPATH=path1:path2...:pathN
// as "{path#}/src/" into trimStrings
for _, goPathString := range goPathList {
trimStrings = append(trimStrings, filepath.Join(goPathString, "src")+string(filepath.Separator))
}
for _, goRootString := range goRootList {
trimStrings = append(trimStrings, filepath.Join(goRootString, "src")+string(filepath.Separator))
}
for _, defaultgoPathString := range defaultgoPathList {
trimStrings = append(trimStrings, filepath.Join(defaultgoPathString, "src")+string(filepath.Separator))
}
for _, defaultgoRootString := range defaultgoRootList {
trimStrings = append(trimStrings, filepath.Join(defaultgoRootString, "src")+string(filepath.Separator))
}
// Remove duplicate entries.
trimStrings = uniqueEntries(trimStrings)
// Add "github.com/minio/minio" as the last to cover
// paths like "{GOROOT}/src/github.com/minio/minio"
// and "{GOPATH}/src/github.com/minio/minio"
trimStrings = append(trimStrings, filepath.Join("github.com", "minio", "minio")+string(filepath.Separator))
loggerHighwayHasher, _ = highwayhash.New(magicHighwayHash256Key) // New will never return error since key is 256 bit
}
func trimTrace(f string) string {
for _, trimString := range trimStrings {
f = strings.TrimPrefix(filepath.ToSlash(f), filepath.ToSlash(trimString))
}
return filepath.FromSlash(f)
}
func getSource(level int) string {
pc, file, lineNumber, ok := runtime.Caller(level)
if ok {
// Clean up the common prefixes
file = trimTrace(file)
_, funcName := filepath.Split(runtime.FuncForPC(pc).Name())
return fmt.Sprintf("%v:%v:%v()", file, lineNumber, funcName)
}
return ""
}
// getTrace method - creates and returns stack trace
func getTrace(traceLevel int) []string {
var trace []string
pc, file, lineNumber, ok := runtime.Caller(traceLevel)
for ok && file != "" {
// Clean up the common prefixes
file = trimTrace(file)
// Get the function name
_, funcName := filepath.Split(runtime.FuncForPC(pc).Name())
// Skip duplicate traces that start with file name, "<autogenerated>"
// and also skip traces with function name that starts with "runtime."
if !strings.HasPrefix(file, "<autogenerated>") &&
!strings.HasPrefix(funcName, "runtime.") {
// Form and append a line of stack trace into a
// collection, 'trace', to build full stack trace
trace = append(trace, fmt.Sprintf("%v:%v:%v()", file, lineNumber, funcName))
// Ignore trace logs beyond the following conditions
for _, name := range matchingFuncNames {
if funcName == name {
return trace
}
}
}
traceLevel++
// Read stack trace information from PC
pc, file, lineNumber, ok = runtime.Caller(traceLevel)
}
return trace
}
// Return the highway hash of the passed string
func hashString(input string) string {
defer loggerHighwayHasher.Reset()
loggerHighwayHasher.Write([]byte(input))
checksum := loggerHighwayHasher.Sum(nil)
return hex.EncodeToString(checksum)
}
// LogAlwaysIf prints a detailed error message during
// the execution of the server.
func LogAlwaysIf(ctx context.Context, err error) {
if err == nil {
return
}
logIf(ctx, err)
}
// LogIf prints a detailed error message during
// the execution of the server, if it is not an
// ignored error.
func LogIf(ctx context.Context, err error) {
if err == nil {
return
}
if err.Error() != diskNotFoundError {
logIf(ctx, err)
}
}
// logIf prints a detailed error message during
// the execution of the server.
func logIf(ctx context.Context, err error) {
if Disable {
return
}
req := GetReqInfo(ctx)
if req == nil {
req = &ReqInfo{API: "SYSTEM"}
}
API := "SYSTEM"
if req.API != "" {
API = req.API
}
tags := make(map[string]string)
for _, entry := range req.GetTags() {
tags[entry.Key] = entry.Val
}
// Get full stack trace
trace := getTrace(3)
// Get the cause for the Error
message := err.Error()
entry := log.Entry{
DeploymentID: req.DeploymentID,
Level: ErrorLvl.String(),
RemoteHost: req.RemoteHost,
RequestID: req.RequestID,
UserAgent: req.UserAgent,
Time: time.Now().UTC().Format(time.RFC3339Nano),
API: &log.API{
Name: API,
Args: &log.Args{
Bucket: req.BucketName,
Object: req.ObjectName,
},
},
Trace: &log.Trace{
Message: message,
Source: trace,
Variables: tags,
},
}
if anonFlag {
entry.API.Args.Bucket = hashString(entry.API.Args.Bucket)
entry.API.Args.Object = hashString(entry.API.Args.Object)
entry.RemoteHost = hashString(entry.RemoteHost)
entry.Message = reflect.TypeOf(err).String()
entry.Trace.Variables = make(map[string]string)
}
// Iterate over all logger targets to send the log entry
for _, t := range Targets {
t.Send(entry)
}
}
// ErrCritical is the value panic'd whenever CriticalIf is called.
var ErrCritical struct{}
// CriticalIf logs the provided error on the console. It fails the
// current go-routine by causing a `panic(ErrCritical)`.
func CriticalIf(ctx context.Context, err error) {
if err != nil {
LogIf(ctx, err)
panic(ErrCritical)
}
}
// FatalIf is similar to Fatal() but it ignores passed nil error
func FatalIf(err error, msg string, data ...interface{}) {
if err == nil {
return
}
fatal(err, msg, data...)
}