mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-16 00:49:26 +01:00
120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
package logr
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"io"
|
|
"runtime"
|
|
"sort"
|
|
)
|
|
|
|
// Formatter turns a LogRec into a formatted string.
|
|
type Formatter interface {
|
|
// Format converts a log record to bytes. If buf is not nil then it will be
|
|
// be filled with the formatted results, otherwise a new buffer will be allocated.
|
|
Format(rec *LogRec, stacktrace bool, buf *bytes.Buffer) (*bytes.Buffer, error)
|
|
}
|
|
|
|
const (
|
|
// DefTimestampFormat is the default time stamp format used by
|
|
// Plain formatter and others.
|
|
DefTimestampFormat = "2006-01-02 15:04:05.000 Z07:00"
|
|
)
|
|
|
|
// DefaultFormatter is the default formatter, outputting only text with
|
|
// no colors and a space delimiter. Use `format.Plain` instead.
|
|
type DefaultFormatter struct {
|
|
}
|
|
|
|
// Format converts a log record to bytes.
|
|
func (p *DefaultFormatter) Format(rec *LogRec, stacktrace bool, buf *bytes.Buffer) (*bytes.Buffer, error) {
|
|
if buf == nil {
|
|
buf = &bytes.Buffer{}
|
|
}
|
|
delim := " "
|
|
timestampFmt := DefTimestampFormat
|
|
|
|
fmt.Fprintf(buf, "%s%s", rec.Time().Format(timestampFmt), delim)
|
|
fmt.Fprintf(buf, "%v%s", rec.Level(), delim)
|
|
fmt.Fprint(buf, rec.Msg(), delim)
|
|
|
|
ctx := rec.Fields()
|
|
if len(ctx) > 0 {
|
|
WriteFields(buf, ctx, " ")
|
|
}
|
|
|
|
if stacktrace {
|
|
frames := rec.StackFrames()
|
|
if len(frames) > 0 {
|
|
buf.WriteString("\n")
|
|
WriteStacktrace(buf, rec.StackFrames())
|
|
}
|
|
}
|
|
buf.WriteString("\n")
|
|
|
|
return buf, nil
|
|
}
|
|
|
|
// WriteFields writes zero or more name value pairs to the io.Writer.
|
|
// The pairs are sorted by key name and output in key=value format
|
|
// with optional separator between fields.
|
|
func WriteFields(w io.Writer, flds Fields, separator string) {
|
|
keys := make([]string, 0, len(flds))
|
|
for k := range flds {
|
|
keys = append(keys, k)
|
|
}
|
|
sort.Strings(keys)
|
|
sep := ""
|
|
for _, key := range keys {
|
|
writeField(w, key, flds[key], sep)
|
|
sep = separator
|
|
}
|
|
}
|
|
|
|
func writeField(w io.Writer, key string, val interface{}, sep string) {
|
|
var template string
|
|
switch v := val.(type) {
|
|
case error:
|
|
val := v.Error()
|
|
if shouldQuote(val) {
|
|
template = "%s%s=%q"
|
|
} else {
|
|
template = "%s%s=%s"
|
|
}
|
|
case string:
|
|
if shouldQuote(v) {
|
|
template = "%s%s=%q"
|
|
} else {
|
|
template = "%s%s=%s"
|
|
}
|
|
default:
|
|
template = "%s%s=%v"
|
|
}
|
|
fmt.Fprintf(w, template, sep, key, val)
|
|
}
|
|
|
|
// shouldQuote returns true if val contains any characters that might be unsafe
|
|
// when injecting log output into an aggregator, viewer or report.
|
|
func shouldQuote(val string) bool {
|
|
for _, c := range val {
|
|
if !((c >= '0' && c <= '9') ||
|
|
(c >= 'a' && c <= 'z') ||
|
|
(c >= 'A' && c <= 'Z')) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// WriteStacktrace formats and outputs a stack trace to an io.Writer.
|
|
func WriteStacktrace(w io.Writer, frames []runtime.Frame) {
|
|
for _, frame := range frames {
|
|
if frame.Function != "" {
|
|
fmt.Fprintf(w, " %s\n", frame.Function)
|
|
}
|
|
if frame.File != "" {
|
|
fmt.Fprintf(w, " %s:%d\n", frame.File, frame.Line)
|
|
}
|
|
}
|
|
}
|