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package cmd
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"os/signal"
"syscall"
)
// ReadConfigFile takes a file path as an argument and attempts to
// unmarshal the content of the file into a struct containing a
// configuration of a Pebble component.
//
// Lifted from
// https://raw.githubusercontent.com/letsencrypt/boulder/master/cmd/shell.go
func ReadConfigFile(filename string, out interface{}) error {
configData, err := ioutil.ReadFile(filename)
if err != nil {
return err
}
return json.Unmarshal(configData, out)
}
// FailOnError exits and prints an error message if we encountered a problem
//
// Lifted from
// https://raw.githubusercontent.com/letsencrypt/boulder/master/cmd/shell.go
func FailOnError(err error, msg string) {
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", msg, err)
os.Exit(1)
}
}
var signalToName = map[os.Signal]string{
syscall.SIGTERM: "SIGTERM",
syscall.SIGINT: "SIGINT",
syscall.SIGHUP: "SIGHUP",
}
// CatchSignals catches SIGTERM, SIGINT, SIGHUP and executes a callback
// method before exiting
func CatchSignals(callback func()) {
sigChan := make(chan os.Signal, 1)
signal.Notify(sigChan, syscall.SIGTERM)
signal.Notify(sigChan, syscall.SIGINT)
signal.Notify(sigChan, syscall.SIGHUP)
sig := <-sigChan
log.Printf("Caught %s", signalToName[sig])
if callback != nil {
callback()
}
log.Printf("Exiting")
os.Exit(0)
}
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