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100 lines
2.3 KiB
Go
100 lines
2.3 KiB
Go
package logrus
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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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)
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type fieldKey string
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// FieldMap allows customization of the key names for default fields.
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type FieldMap map[fieldKey]string
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func (f FieldMap) resolve(key fieldKey) string {
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if k, ok := f[key]; ok {
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return k
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}
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return string(key)
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}
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// JSONFormatter formats logs into parsable json
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type JSONFormatter struct {
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// TimestampFormat sets the format used for marshaling timestamps.
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TimestampFormat string
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// DisableTimestamp allows disabling automatic timestamps in output
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DisableTimestamp bool
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// DataKey allows users to put all the log entry parameters into a nested dictionary at a given key.
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DataKey string
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// FieldMap allows users to customize the names of keys for default fields.
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// As an example:
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// formatter := &JSONFormatter{
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// FieldMap: FieldMap{
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// FieldKeyTime: "@timestamp",
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// FieldKeyLevel: "@level",
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// FieldKeyMsg: "@message",
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// },
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// }
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FieldMap FieldMap
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// PrettyPrint will indent all json logs
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PrettyPrint bool
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}
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// Format renders a single log entry
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func (f *JSONFormatter) Format(entry *Entry) ([]byte, error) {
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data := make(Fields, len(entry.Data)+3)
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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.DataKey != "" {
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newData := make(Fields, 4)
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newData[f.DataKey] = data
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data = newData
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}
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prefixFieldClashes(data, f.FieldMap)
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timestampFormat := f.TimestampFormat
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if timestampFormat == "" {
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timestampFormat = defaultTimestampFormat
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}
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if entry.err != "" {
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data[f.FieldMap.resolve(FieldKeyLogrusError)] = entry.err
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}
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if !f.DisableTimestamp {
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data[f.FieldMap.resolve(FieldKeyTime)] = entry.Time.Format(timestampFormat)
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}
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data[f.FieldMap.resolve(FieldKeyMsg)] = entry.Message
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data[f.FieldMap.resolve(FieldKeyLevel)] = entry.Level.String()
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var b *bytes.Buffer
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if entry.Buffer != nil {
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b = entry.Buffer
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} else {
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b = &bytes.Buffer{}
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}
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encoder := json.NewEncoder(b)
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if f.PrettyPrint {
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encoder.SetIndent("", " ")
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}
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if err := encoder.Encode(data); 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 b.Bytes(), nil
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}
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