fix: correct LocalStack status after Lambda invocation (#7)

LocalStack’s status tracker was incorrectly reporting the main container
as stopped after invoking a Lambda function. This happened because
‎`docker events --filter container=localstack-main` matches any
container whose name starts with ‎`localstack-main`, including temporary
Lambda containers (e.g., ‎`localstack-main-<hash>`). As a result, the
tracker picked up stop events for these Lambda containers instead of the
main one, leading to false status reports. This commit updates the
filter logic to ensure only the main container’s events are tracked.

Author: skyrpex

src/utils/container-status.ts

@@ -1,6 +1,7 @@
 import { exec, spawn } from "node:child_process";
 
 import type { Disposable, LogOutputChannel } from "vscode";
+import * as z from "zod/v4-mini";
 
 import { createEmitter } from "./emitter.ts";
 
@@ -53,6 +54,23 @@ export async function createContainerStatusTracker(
 	};
 }
 
+const DockerEventsSchema = z.object({
+	Action: z.enum(["start", "kill", "die"]),
+	Actor: z.object({
+		Attributes: z.object({
+			name: z.string(),
+		}),
+	}),
+});
+
+function safeJsonParse(text: string): unknown {
+	try {
+		return JSON.parse(text);
+	} catch {
+		return undefined;
+	}
+}
+
 function listenToContainerStatus(
 	containerName: string,
 	outputChannel: LogOutputChannel,
@@ -72,8 +90,14 @@ function listenToContainerStatus(
 				"events",
 				"--filter",
 				`container=${containerName}`,
+				"--filter",
+				"event=start",
+				"--filter",
+				"event=kill",
+				"--filter",
+				"event=die",
 				"--format",
-				"{{.Status}}",
+				"json",
 			]);
 
 			dockerEvents.on("error", (error) => {
@@ -108,8 +132,18 @@ function listenToContainerStatus(
 
 			dockerEvents.stdout.on("data", (data: Buffer) => {
 				const lines = data.toString().split("\n").filter(Boolean);
-				for (const status of lines) {
-					switch (status) {
+				for (const line of lines) {
+					const json = safeJsonParse(line);
+					const parsed = DockerEventsSchema.safeParse(json);
+					if (!parsed.success) {
+						continue;
+					}
+
+					if (parsed.data.Actor.Attributes.name !== containerName) {
+						continue;
+					}
+
+					switch (parsed.data.Action) {
 						case "start":
 							onStatusChange("running");
 							break;