/
exit.go
52 lines (46 loc) · 1.61 KB
/
exit.go
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package xlog
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)
}
}