2019-04-29 21:25:05 +00:00
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// Copyright 2018 The gVisor Authors.
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2018-04-27 17:37:02 +00:00
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package log
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import (
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"encoding/json"
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"fmt"
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"time"
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)
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type jsonLog struct {
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Msg string `json:"msg"`
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Level Level `json:"level"`
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Time time.Time `json:"time"`
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}
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// MarshalJSON implements json.Marshaler.MarashalJSON.
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func (lv Level) MarshalJSON() ([]byte, error) {
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switch lv {
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case Warning:
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return []byte(`"warning"`), nil
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case Info:
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return []byte(`"info"`), nil
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case Debug:
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return []byte(`"debug"`), nil
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default:
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return nil, fmt.Errorf("unknown level %v", lv)
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}
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}
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// UnmarshalJSON implements json.Unmarshaler.UnmarshalJSON. It can unmarshal
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// from both string names and integers.
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func (lv *Level) UnmarshalJSON(b []byte) error {
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switch s := string(b); s {
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case "0", `"warning"`:
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*lv = Warning
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case "1", `"info"`:
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*lv = Info
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case "2", `"debug"`:
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*lv = Debug
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default:
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return fmt.Errorf("unknown level %q", s)
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}
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return nil
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}
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// JSONEmitter logs messages in json format.
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type JSONEmitter struct {
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Writer
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}
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// Emit implements Emitter.Emit.
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func (e JSONEmitter) Emit(level Level, timestamp time.Time, format string, v ...interface{}) {
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j := jsonLog{
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Msg: fmt.Sprintf(format, v...),
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Level: level,
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Time: timestamp,
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}
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b, err := json.Marshal(j)
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if err != nil {
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panic(err)
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}
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e.Writer.Write(b)
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}
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