register for specific signals (#211)

* register for specific signals

* Update CHANGELOG.md

CHANGELOG.md

@@ -5,10 +5,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Changed
 - cleaned up shutdown logic for outbound sender [#205](https://github.com/xmidt-org/caduceus/pull/205)
 - added resetting queue depth and current workers gauges to outbound sender [#205](https://github.com/xmidt-org/caduceus/pull/205)
 - removed queueEmpty variable from outbound sender [#209](https://github.com/xmidt-org/caduceus/pull/209)
 - fixed outbound sender's long running dispatcher() goroutine to not exit when a cutoff occurs [#210](https://github.com/xmidt-org/caduceus/pull/210)
+- register for specific OS signals [#211](https://github.com/xmidt-org/caduceus/pull/211)
 
 ## [v0.2.7]
 - pared down logging, especially debugging logs [#196](https://github.com/xmidt-org/caduceus/pull/196)

main.go

@@ -220,16 +220,12 @@ func caduceus(arguments []string) int {
 	infoLog.Log(messageKey, "Caduceus is up and running!", "elapsedTime", time.Since(beginCaduceus))
 
 	signals := make(chan os.Signal, 10)
-	signal.Notify(signals)
+	signal.Notify(signals, os.Kill, os.Interrupt)
 	for exit := false; !exit; {
 		select {
 		case s := <-signals:
-			if s != os.Kill && s != os.Interrupt {
-				logger.Log(level.Key(), level.InfoValue(), logging.MessageKey(), "ignoring signal", "signal", s)
-			} else {
-				logger.Log(level.Key(), level.ErrorValue(), logging.MessageKey(), "exiting due to signal", "signal", s)
-				exit = true
-			}
+			logger.Log(level.Key(), level.ErrorValue(), logging.MessageKey(), "exiting due to signal", "signal", s)
+			exit = true
 		case <-done:
 			logger.Log(level.Key(), level.ErrorValue(), logging.MessageKey(), "one or more servers exited")
 			exit = true