catch ctl-c interrupt, log stack

In all cases except watch commnad (which now handles ctrl-c) that is
sign of problem. Stack will tell us where we stuck.

Closes #63

cli/controller/watch.go

@@ -1,7 +1,10 @@
 package controller
 
 import (
+	"os"
+	"os/signal"
 	"regexp"
+	"syscall"
 	"time"
 
 	"github.com/mantil-io/mantil/cli/log"
@@ -77,6 +80,8 @@ func runWatcher(onChange func(), path string) error {
 	r := regexp.MustCompile(`\.go$`)
 	w.AddFilterHook(watcher.RegexFilterHook(r, false))
 
+	ctrlc := make(chan os.Signal, 1)
+	signal.Notify(ctrlc, syscall.SIGINT)
 	go func() {
 		for {
 			select {
@@ -86,6 +91,8 @@ func runWatcher(onChange func(), path string) error {
 				ui.Error(err)
 			case <-w.Closed:
 				return
+			case <-ctrlc:
+				w.Close()
 			}
 		}
 	}()

cli/log/log.go

@@ -2,10 +2,12 @@
 package log
 
 import (
+	"bytes"
 	"fmt"
 	"io"
 	"log"
 	"os"
+	"runtime/pprof"
 	"strings"
 	"time"
 
@@ -97,6 +99,18 @@ func Printf(format string, v ...interface{}) {
 	logs.Output(2, fmt.Sprintf(format, v...))
 }
 
+func Signal(name string) {
+	if logFile == nil {
+		return
+	}
+	bb := bytes.NewBuffer(nil)
+	Printf("signal %s", name)
+	pprof.Lookup("goroutine").WriteTo(bb, 1)
+	buf := bb.Bytes()
+	logFile.Write(buf)
+	cliCommand.Add(domain.Event{Signal: &domain.Signal{Name: name, Stack: string(buf)}})
+}
+
 func PrintfWithCallDepth(calldepth int, format string, v ...interface{}) {
 	if logFile == nil {
 		return

cli/main.go

@@ -3,6 +3,8 @@ package main
 import (
 	"fmt"
 	"os"
+	"os/signal"
+	"syscall"
 
 	"github.com/mantil-io/mantil/cli/cmd"
 	"github.com/mantil-io/mantil/cli/log"
@@ -67,9 +69,24 @@ func run() error {
 	}
 	defer log.Close()
 	log.Printf("version: %s, args: %v", domain.Version(), os.Args)
+	if !isWatch() { // watch has it's own ctrlc handling
+		go catchInterupt()
+	}
 	if err := cmd.Execute(); err != nil {
 		log.Error(err)
 		return err
 	}
 	return nil
 }
+
+func isWatch() bool {
+	return len(os.Args) > 1 && os.Args[1] == "watch"
+}
+
+func catchInterupt() {
+	ctrlc := make(chan os.Signal, 1)
+	signal.Notify(ctrlc, syscall.SIGINT)
+	log.Signal((<-ctrlc).String())
+	log.Close()
+	os.Exit(1)
+}

domain/event.go

@@ -70,6 +70,7 @@ type Event struct {
 	Timestamp int64    `short:"t,omitempty" json:"timestamp,omitempty"`
 	GoBuild   *GoBuild `short:"g,omitempty" json:"goBuild,omitempty"`
 	Deploy    *Deploy  `short:"d,omitempty" json:"deploy,omitempty"`
+	Signal    *Signal  `short:"s,omitempty" json:"signal,omitempty"`
 }
 
 type GoBuild struct {
@@ -82,6 +83,11 @@ type Deploy struct {
 	UpdateDuration int64 `short:"d,omitempty" json:"updateDuration,omitempty"`
 }
 
+type Signal struct {
+	Name  string `short:"n,omitempty" json:"name,omitempty"`
+	Stack string `short:"s,omitempty" json:"stack,omitempty"`
+}
+
 // marshal
 var shortConfig = jsoniter.Config{
 	EscapeHTML:             true,