internal/server/model.Handler.Route is no longer a pointer

Also Spawn() now checks if entrypoint is not set

Co-authored-by: Roberto Abdelkader Martínez Pérez <robertomartinezp@gmail.com>

internal/server/user/spawn/spawn.go

@@ -0,0 +1,37 @@
+package spawn
+
+import (
+	"errors"
+	"io"
+	"os"
+	"os/exec"
+
+	"github.com/google/shlex"
+
+	"github.com/BBVA/kapow/internal/server/model"
+)
+
+func Spawn(h *model.Handler, out io.Writer) error {
+	if h.Route.Entrypoint == "" {
+		return errors.New("Entrypoint cannot be empty")
+	}
+	args, err := shlex.Split(h.Route.Entrypoint)
+	if err != nil {
+		return err
+	}
+
+	if h.Route.Command != "" {
+		args = append(args, h.Route.Command)
+	}
+
+	cmd := exec.Command(args[0], args[1:]...)
+	if out != nil {
+		cmd.Stdout = out
+	}
+	cmd.Env = append(os.Environ(), "KAPOW_URL=http://localhost:8081")
+	cmd.Env = append(cmd.Env, "KAPOW_HANDLER_ID="+h.ID)
+
+	err = cmd.Run()
+
+	return err
+}