70 lines
2.3 KiB
Go
70 lines
2.3 KiB
Go
// Go support for leveled logs, analogous to https://code.google.com/p/google-glog/
|
|
//
|
|
// Copyright 2013 Google Inc. All Rights Reserved.
|
|
// Copyright 2022 The Kubernetes 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 klog
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
var (
|
|
|
|
// ExitFlushTimeout is the timeout that klog has traditionally used during
|
|
// calls like Fatal or Exit when flushing log data right before exiting.
|
|
// Applications that replace those calls and do not have some specific
|
|
// requirements like "exit immediately" can use this value as parameter
|
|
// for FlushAndExit.
|
|
//
|
|
// Can be set for testing purpose or to change the application's
|
|
// default.
|
|
ExitFlushTimeout = 10 * time.Second
|
|
|
|
// OsExit is the function called by FlushAndExit to terminate the program.
|
|
//
|
|
// Can be set for testing purpose or to change the application's
|
|
// default behavior. Note that the function should not simply return
|
|
// because callers of functions like Fatal will not expect that.
|
|
OsExit = os.Exit
|
|
)
|
|
|
|
// FlushAndExit flushes log data for a certain amount of time and then calls
|
|
// os.Exit. Combined with some logging call it provides a replacement for
|
|
// traditional calls like Fatal or Exit.
|
|
func FlushAndExit(flushTimeout time.Duration, exitCode int) {
|
|
timeoutFlush(flushTimeout)
|
|
OsExit(exitCode)
|
|
}
|
|
|
|
// timeoutFlush calls Flush and returns when it completes or after timeout
|
|
// elapses, whichever happens first. This is needed because the hooks invoked
|
|
// by Flush may deadlock when klog.Fatal is called from a hook that holds
|
|
// a lock. Flushing also might take too long.
|
|
func timeoutFlush(timeout time.Duration) {
|
|
done := make(chan bool, 1)
|
|
go func() {
|
|
Flush() // calls logging.lockAndFlushAll()
|
|
done <- true
|
|
}()
|
|
select {
|
|
case <-done:
|
|
case <-time.After(timeout):
|
|
fmt.Fprintln(os.Stderr, "klog: Flush took longer than", timeout)
|
|
}
|
|
}
|