75 lines
1.6 KiB
Go
75 lines
1.6 KiB
Go
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package formatter
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import (
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"encoding/json"
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"fmt"
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"runtime"
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"strings"
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"github.com/sirupsen/logrus"
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)
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// JSONExtendedFormatter formats log information to JSON format with time and line number in file
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type JSONExtendedFormatter struct {
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ShowLn bool
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}
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func (f *JSONExtendedFormatter) Format(entry *logrus.Entry) ([]byte, error) {
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// Because entry.Data is not concurrent write safe, we need to copy the dictionary
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data := make(logrus.Fields, len(entry.Data)+4)
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for k, v := range entry.Data {
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switch v := v.(type) {
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case error:
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// Otherwise errors are ignored by `encoding/json`
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// https://github.com/Sirupsen/logrus/issues/137
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data[k] = v.Error()
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default:
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data[k] = v
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}
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}
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if f.ShowLn {
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var (
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filename = "???"
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filepath string
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line int
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ok = true
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)
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// worst case is O(call stack size)
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for depth := 3; ok; depth++ {
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_, filepath, line, ok = runtime.Caller(depth)
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if !ok {
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line = 0
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filename = "???"
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break
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} else if !strings.Contains(filepath, "logrus") {
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if line < 0 {
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line = 0
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}
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slash := strings.LastIndex(filepath, "/")
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if slash >= 0 {
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filename = filepath[slash+1:]
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} else {
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filename = filepath
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}
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break
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}
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}
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data["Location"] = fmt.Sprintf("%s:%d", filename, line)
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}
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now := entry.Time
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ts := now.Format("2006-01-02 15:04:05")
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ms := now.Nanosecond() / 1000
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data["Time"] = fmt.Sprintf("%s.%06d", ts, ms)
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data["Event"] = entry.Message
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data["Level"] = entry.Level.String()
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serialized, err := json.Marshal(data)
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if err != nil {
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return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
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}
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return append(serialized, '\n'), nil
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}
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