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72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package formatters
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"sync"
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"time"
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"github.com/subchen/go-log"
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)
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// JSONFormatter is a json formatter
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type JSONFormatter struct {
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AppName string
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TimeFormat string
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init sync.Once
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host string
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pid int
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}
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// Format implements log.Formatter
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func (f JSONFormatter) Format(level log.Level, msg string, logger *log.Logger) []byte {
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// output fields: time level host app pid file line msg
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f.init.Do(func() {
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if f.AppName == "" {
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f.AppName = filepath.Base(os.Args[0])
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}
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if f.TimeFormat == "" {
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f.TimeFormat = "2006-01-02T15:04:05.000-0700"
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}
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f.host, _ = os.Hostname()
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f.pid = os.Getpid()
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})
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data := make(map[string]interface{}, 8)
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// file, line
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file, line := FilelineCaller(7)
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data["time"] = time.Now().Format(f.TimeFormat)
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data["level"] = level.String()
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data["host"] = f.host
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data["app"] = f.AppName
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data["pid"] = f.pid
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data["file"] = file
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data["line"] = line
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data["msg"] = msg
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serialized, err := marshal(data)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to marshal json, %v\n", err)
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}
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return serialized
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}
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func marshal(v interface{}) ([]byte, error) {
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var buf bytes.Buffer
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encoder := json.NewEncoder(&buf)
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encoder.SetEscapeHTML(false)
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err := encoder.Encode(v)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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