405 lines
8.7 KiB
Go
405 lines
8.7 KiB
Go
package hclog
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import (
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"bufio"
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"encoding"
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"encoding/json"
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"fmt"
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"log"
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"os"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"time"
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)
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var (
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_levelToBracket = map[Level]string{
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Debug: "[DEBUG]",
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Trace: "[TRACE]",
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Info: "[INFO ]",
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Warn: "[WARN ]",
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Error: "[ERROR]",
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}
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)
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// Given the options (nil for defaults), create a new Logger
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func New(opts *LoggerOptions) Logger {
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if opts == nil {
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opts = &LoggerOptions{}
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}
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output := opts.Output
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if output == nil {
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output = os.Stderr
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}
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level := opts.Level
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if level == NoLevel {
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level = DefaultLevel
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}
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mtx := opts.Mutex
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if mtx == nil {
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mtx = new(sync.Mutex)
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}
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return &intLogger{
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m: mtx,
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json: opts.JSONFormat,
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caller: opts.IncludeLocation,
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name: opts.Name,
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w: bufio.NewWriter(output),
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level: level,
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}
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}
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// The internal logger implementation. Internal in that it is defined entirely
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// by this package.
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type intLogger struct {
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json bool
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caller bool
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name string
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// this is a pointer so that it's shared by any derived loggers, since
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// those derived loggers share the bufio.Writer as well.
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m *sync.Mutex
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w *bufio.Writer
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level Level
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implied []interface{}
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}
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// Make sure that intLogger is a Logger
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var _ Logger = &intLogger{}
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// The time format to use for logging. This is a version of RFC3339 that
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// contains millisecond precision
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const TimeFormat = "2006-01-02T15:04:05.000Z0700"
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// Log a message and a set of key/value pairs if the given level is at
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// or more severe that the threshold configured in the Logger.
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func (z *intLogger) Log(level Level, msg string, args ...interface{}) {
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if level < z.level {
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return
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}
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t := time.Now()
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z.m.Lock()
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defer z.m.Unlock()
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if z.json {
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z.logJson(t, level, msg, args...)
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} else {
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z.log(t, level, msg, args...)
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}
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z.w.Flush()
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}
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// Cleanup a path by returning the last 2 segments of the path only.
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func trimCallerPath(path string) string {
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// lovely borrowed from zap
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// nb. To make sure we trim the path correctly on Windows too, we
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// counter-intuitively need to use '/' and *not* os.PathSeparator here,
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// because the path given originates from Go stdlib, specifically
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// runtime.Caller() which (as of Mar/17) returns forward slashes even on
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// Windows.
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//
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// See https://github.com/golang/go/issues/3335
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// and https://github.com/golang/go/issues/18151
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//
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// for discussion on the issue on Go side.
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//
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// Find the last separator.
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//
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idx := strings.LastIndexByte(path, '/')
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if idx == -1 {
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return path
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}
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// Find the penultimate separator.
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idx = strings.LastIndexByte(path[:idx], '/')
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if idx == -1 {
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return path
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}
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return path[idx+1:]
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}
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// Non-JSON logging format function
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func (z *intLogger) log(t time.Time, level Level, msg string, args ...interface{}) {
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z.w.WriteString(t.Format(TimeFormat))
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z.w.WriteByte(' ')
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s, ok := _levelToBracket[level]
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if ok {
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z.w.WriteString(s)
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} else {
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z.w.WriteString("[UNKN ]")
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}
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if z.caller {
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if _, file, line, ok := runtime.Caller(3); ok {
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z.w.WriteByte(' ')
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z.w.WriteString(trimCallerPath(file))
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z.w.WriteByte(':')
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z.w.WriteString(strconv.Itoa(line))
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z.w.WriteByte(':')
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}
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}
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z.w.WriteByte(' ')
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if z.name != "" {
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z.w.WriteString(z.name)
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z.w.WriteString(": ")
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}
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z.w.WriteString(msg)
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args = append(z.implied, args...)
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var stacktrace CapturedStacktrace
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if args != nil && len(args) > 0 {
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if len(args)%2 != 0 {
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cs, ok := args[len(args)-1].(CapturedStacktrace)
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if ok {
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args = args[:len(args)-1]
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stacktrace = cs
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} else {
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args = append(args, "<unknown>")
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}
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}
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z.w.WriteByte(':')
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FOR:
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for i := 0; i < len(args); i = i + 2 {
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var val string
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switch st := args[i+1].(type) {
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case string:
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val = st
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case int:
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val = strconv.FormatInt(int64(st), 10)
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case int64:
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val = strconv.FormatInt(int64(st), 10)
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case int32:
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val = strconv.FormatInt(int64(st), 10)
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case int16:
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val = strconv.FormatInt(int64(st), 10)
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case int8:
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val = strconv.FormatInt(int64(st), 10)
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case uint:
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val = strconv.FormatUint(uint64(st), 10)
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case uint64:
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val = strconv.FormatUint(uint64(st), 10)
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case uint32:
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val = strconv.FormatUint(uint64(st), 10)
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case uint16:
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val = strconv.FormatUint(uint64(st), 10)
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case uint8:
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val = strconv.FormatUint(uint64(st), 10)
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case CapturedStacktrace:
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stacktrace = st
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continue FOR
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default:
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val = fmt.Sprintf("%v", st)
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}
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z.w.WriteByte(' ')
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z.w.WriteString(args[i].(string))
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z.w.WriteByte('=')
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if strings.ContainsAny(val, " \t\n\r") {
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z.w.WriteByte('"')
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z.w.WriteString(val)
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z.w.WriteByte('"')
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} else {
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z.w.WriteString(val)
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}
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}
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}
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z.w.WriteString("\n")
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if stacktrace != "" {
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z.w.WriteString(string(stacktrace))
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}
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}
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// JSON logging function
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func (z *intLogger) logJson(t time.Time, level Level, msg string, args ...interface{}) {
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vals := map[string]interface{}{
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"@message": msg,
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"@timestamp": t.Format("2006-01-02T15:04:05.000000Z07:00"),
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}
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var levelStr string
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switch level {
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case Error:
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levelStr = "error"
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case Warn:
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levelStr = "warn"
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case Info:
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levelStr = "info"
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case Debug:
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levelStr = "debug"
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case Trace:
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levelStr = "trace"
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default:
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levelStr = "all"
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}
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vals["@level"] = levelStr
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if z.name != "" {
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vals["@module"] = z.name
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}
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if z.caller {
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if _, file, line, ok := runtime.Caller(3); ok {
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vals["@caller"] = fmt.Sprintf("%s:%d", file, line)
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}
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}
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if args != nil && len(args) > 0 {
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if len(args)%2 != 0 {
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cs, ok := args[len(args)-1].(CapturedStacktrace)
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if ok {
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args = args[:len(args)-1]
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vals["stacktrace"] = cs
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} else {
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args = append(args, "<unknown>")
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}
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}
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for i := 0; i < len(args); i = i + 2 {
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if _, ok := args[i].(string); !ok {
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// As this is the logging function not much we can do here
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// without injecting into logs...
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continue
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}
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val := args[i+1]
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// Check if val is of type error. If error type doesn't
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// implement json.Marshaler or encoding.TextMarshaler
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// then set val to err.Error() so that it gets marshaled
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if err, ok := val.(error); ok {
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switch err.(type) {
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case json.Marshaler, encoding.TextMarshaler:
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default:
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val = err.Error()
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}
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}
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vals[args[i].(string)] = val
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}
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}
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err := json.NewEncoder(z.w).Encode(vals)
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if err != nil {
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panic(err)
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}
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}
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// Emit the message and args at DEBUG level
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func (z *intLogger) Debug(msg string, args ...interface{}) {
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z.Log(Debug, msg, args...)
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}
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// Emit the message and args at TRACE level
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func (z *intLogger) Trace(msg string, args ...interface{}) {
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z.Log(Trace, msg, args...)
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}
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// Emit the message and args at INFO level
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func (z *intLogger) Info(msg string, args ...interface{}) {
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z.Log(Info, msg, args...)
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}
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// Emit the message and args at WARN level
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func (z *intLogger) Warn(msg string, args ...interface{}) {
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z.Log(Warn, msg, args...)
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}
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// Emit the message and args at ERROR level
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func (z *intLogger) Error(msg string, args ...interface{}) {
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z.Log(Error, msg, args...)
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}
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// Indicate that the logger would emit TRACE level logs
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func (z *intLogger) IsTrace() bool {
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return z.level == Trace
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}
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// Indicate that the logger would emit DEBUG level logs
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func (z *intLogger) IsDebug() bool {
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return z.level <= Debug
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}
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// Indicate that the logger would emit INFO level logs
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func (z *intLogger) IsInfo() bool {
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return z.level <= Info
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}
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// Indicate that the logger would emit WARN level logs
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func (z *intLogger) IsWarn() bool {
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return z.level <= Warn
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}
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// Indicate that the logger would emit ERROR level logs
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func (z *intLogger) IsError() bool {
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return z.level <= Error
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}
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// Return a sub-Logger for which every emitted log message will contain
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// the given key/value pairs. This is used to create a context specific
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// Logger.
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func (z *intLogger) With(args ...interface{}) Logger {
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var nz intLogger = *z
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nz.implied = append(nz.implied, args...)
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return &nz
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}
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// Create a new sub-Logger that a name decending from the current name.
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// This is used to create a subsystem specific Logger.
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func (z *intLogger) Named(name string) Logger {
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var nz intLogger = *z
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if nz.name != "" {
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nz.name = nz.name + "." + name
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} else {
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nz.name = name
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}
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return &nz
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}
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// Create a new sub-Logger with an explicit name. This ignores the current
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// name. This is used to create a standalone logger that doesn't fall
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// within the normal hierarchy.
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func (z *intLogger) ResetNamed(name string) Logger {
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var nz intLogger = *z
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nz.name = name
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return &nz
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}
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// Create a *log.Logger that will send it's data through this Logger. This
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// allows packages that expect to be using the standard library log to actually
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// use this logger.
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func (z *intLogger) StandardLogger(opts *StandardLoggerOptions) *log.Logger {
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if opts == nil {
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opts = &StandardLoggerOptions{}
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}
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return log.New(&stdlogAdapter{z, opts.InferLevels}, "", 0)
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}
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