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json_k8s.go
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json_k8s.go
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// Copyright 2018 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package log
import (
"encoding/json"
"fmt"
"runtime"
"strings"
"time"
)
type k8sJSONLog struct {
Log string `json:"log"`
Level Level `json:"level"`
Time time.Time `json:"time"`
}
// K8sJSONEmitter logs messages in json format that is compatible with
// Kubernetes fluent configuration.
type K8sJSONEmitter struct {
*Writer
}
// Emit implements Emitter.Emit.
func (e K8sJSONEmitter) Emit(depth int, level Level, timestamp time.Time, format string, v ...any) {
logLine := fmt.Sprintf(format, v...)
if _, file, line, ok := runtime.Caller(depth + 1); ok {
if slash := strings.LastIndexByte(file, byte('/')); slash >= 0 {
file = file[slash+1:] // Trim any directory path from the file.
}
logLine = fmt.Sprintf("%s:%d] %s", file, line, logLine)
}
j := k8sJSONLog{
Log: logLine,
Level: level,
Time: timestamp,
}
b, err := json.Marshal(j)
if err != nil {
panic(err)
}
e.Writer.Write(b)
}