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package main | |
import ( | |
"flag" | |
"fmt" | |
"github.com/cenkalti/backoff" | |
"log" | |
"os" | |
"os/exec" | |
"time" | |
) | |
var ( | |
flagInitialInterval = flag.Int("initialInterval", 1, "retry interval(s)") | |
flagMaxElapsedTime = flag.Int("maxElapsedTime", 10000, "Max Elapsed Time(s) is limit of backoff steps. If the job spends over this, job makes stopped. If set 0, the job will never stop.") | |
flagMaxInterval = flag.Int("maxInterval", 1000, "cap of retry interval(s)") | |
) | |
func usage() { | |
fmt.Fprintf(os.Stderr, "Usage: retry <command>\n\n") | |
flag.PrintDefaults() | |
os.Exit(1) | |
} | |
func main() { | |
flag.Parse() | |
args := flag.Args() | |
if len(args) == 0 { | |
usage() | |
} | |
var b []byte | |
operation := func() error { | |
var err error | |
b, err = exec.Command(flag.Arg(0), args[1:]...).Output() | |
if err != nil { | |
log.Printf("err: %s", err) | |
} | |
return err | |
} | |
bf := backoff.NewExponentialBackOff() | |
second := func(i int) time.Duration { | |
return time.Duration(i) * time.Second | |
} | |
bf.MaxElapsedTime = second(*flagMaxElapsedTime) | |
bf.MaxInterval = second(*flagMaxInterval) | |
bf.InitialInterval = second(*flagInitialInterval) | |
err := backoff.Retry(operation, bf) | |
if err != nil { | |
fmt.Fprintf(os.Stderr, "operation failed: %s\n", err) | |
os.Exit(1) | |
} | |
fmt.Fprint(os.Stdout, string(b)) | |
os.Exit(0) | |
} | |
// -> % go run /tmp/retry.go -initialInterval=6 -maxElapsedTime=13 hoge | |
// 2015/08/26 16:43:28 err: exec: "hoge": executable file not found in $PATH | |
// 2015/08/26 16:43:35 err: exec: "hoge": executable file not found in $PATH | |
// 2015/08/26 16:43:48 err: exec: "hoge": executable file not found in $PATH | |
// operation failed: exec: "hoge": executable file not found in $PATH | |
// exit status 1 |
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