Use a single node process (#43)

.gitignore

@@ -6,3 +6,4 @@ samples/**/*terraform.tfstate*
 /samples/**/*-package.zip
 .terrable/
 dist/
+__debug_bin*

.vscode/launch.json

@@ -15,7 +15,7 @@
             "request": "attach",
             "port": 9229,
             "restart": true,
-            "continueOnAttach": true,
+            "continueOnAttach": false,
             "address": "localhost",
             "localRoot": "${workspaceFolder}",
             "remoteRoot": "${workspaceFolder}",

offline/handler_server.go

@@ -16,7 +16,7 @@ func ServeHandler(handlerInstance *HandlerInstance, r *mux.Router) {
 	inputFiles := handlerInstance.CompileHandler()
 	go handlerInstance.WatchForChanges(inputFiles)
 
-	np, err := NewNodeProcess()
+	np, err := GetNodeProcess()
 
 	if err != nil {
 		panic(err)

offline/node_process.go

@@ -18,7 +18,27 @@ type NodeProcess struct {
 //go:embed node_handler_wrapper.js
 var NODE_HANDLER_WRAPPER string
 
-func NewNodeProcess() (*NodeProcess, error) {
+var (
+	nodeProcess          *NodeProcess
+	nodeProcessSyncOnce  sync.Once
+	nodeProcessInitError error
+)
+
+func GetNodeProcess() (*NodeProcess, error) {
+	nodeProcessSyncOnce.Do(func() {
+		newNodeProcess, err := initNodeProcess()
+		nodeProcessInitError = err
+		nodeProcess = newNodeProcess
+	})
+
+	if nodeProcessInitError != nil {
+		return nil, nodeProcessInitError
+	}
+
+	return nodeProcess, nil
+}
+
+func initNodeProcess() (*NodeProcess, error) {
 	cmd := exec.Command("node", "--inspect=9229", "-e", NODE_HANDLER_WRAPPER)
 
 	stdin, err := cmd.StdinPipe()

terrable_build

@@ -1 +1 @@
-version = 0.1.7
+version = 0.1.8