github.com/MerlinKodo/gvisor@v0.0.0-20231110090155-957f62ecf90e/pkg/log/json_k8s.go (about)

     1  // Copyright 2018 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package log
    16  
    17  import (
    18  	"encoding/json"
    19  	"fmt"
    20  	"time"
    21  )
    22  
    23  type k8sJSONLog struct {
    24  	Log   string    `json:"log"`
    25  	Level Level     `json:"level"`
    26  	Time  time.Time `json:"time"`
    27  }
    28  
    29  // K8sJSONEmitter logs messages in json format that is compatible with
    30  // Kubernetes fluent configuration.
    31  type K8sJSONEmitter struct {
    32  	*Writer
    33  }
    34  
    35  // Emit implements Emitter.Emit.
    36  func (e K8sJSONEmitter) Emit(_ int, level Level, timestamp time.Time, format string, v ...any) {
    37  	j := k8sJSONLog{
    38  		Log:   fmt.Sprintf(format, v...),
    39  		Level: level,
    40  		Time:  timestamp,
    41  	}
    42  	b, err := json.Marshal(j)
    43  	if err != nil {
    44  		panic(err)
    45  	}
    46  	e.Writer.Write(b)
    47  }