Added fn start

fn/start.go

@@ -0,0 +1,83 @@
+package main
+
+/*
+usage: fn init <name>
+
+If there's a Dockerfile found, this will generate the basic file with just the image name. exit
+It will then try to decipher the runtime based on the files in the current directory, if it can't figure it out, it will ask.
+It will then take a best guess for what the entrypoint will be based on the language, it it can't guess, it will ask.
+
+*/
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
+
+	"github.com/Sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+func startCmd() cli.Command {
+	return cli.Command{
+		Name:   "start",
+		Usage:  "start a functions server",
+		Action: start,
+		Flags: []cli.Flag{
+			cli.StringFlag{
+				Name:  "log-level",
+				Usage: "--log-level DEBUG to enable debugging",
+			},
+		},
+	}
+}
+
+func start(c *cli.Context) error {
+	denvs := ""
+	if c.String("log-level") != "" {
+		denvs += "-e GIN_MODE=" + c.String("log-level")
+	}
+	// docker run --rm -it --name functions -v ${PWD}/data:/app/data -v /var/run/docker.sock:/var/run/docker.sock -p 8080:8080 treeder/functions
+	wd, err := os.Getwd()
+	if err != nil {
+		logrus.WithError(err).Fatalln("Getwd failed")
+	}
+	cmd := exec.Command("docker", "run", "--rm", "-i",
+		"--name", "functions",
+		"-v", fmt.Sprintf("%s/data:/app/data", wd),
+		"-v", "/var/run/docker.sock:/var/run/docker.sock",
+		"-p", "8080:8080",
+		"treeder/functions")
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Start()
+	if err != nil {
+		logrus.WithError(err).Fatalln("starting command failed")
+	}
+
+	done := make(chan error, 1)
+	go func() {
+		done <- cmd.Wait()
+	}()
+	// catch ctrl-c and kill
+	sigC := make(chan os.Signal, 2)
+	signal.Notify(sigC, os.Interrupt, syscall.SIGTERM)
+
+	select {
+	case <-sigC:
+		logrus.Infoln("interrupt caught, exiting")
+		err = cmd.Process.Kill()
+		if err != nil {
+			logrus.WithError(err).Errorln("Could not kill process")
+		}
+	case err := <-done:
+		if err != nil {
+			logrus.WithError(err).Errorln("processed finished with error")
+		} else {
+			logrus.Println("process done gracefully without error")
+		}
+	}
+	return nil
+}