examples/chat-server: use environment variables for configuration

Author: joeltg

examples/chat-server/Dockerfile

@@ -5,4 +5,4 @@ COPY package.json package.json
 COPY contract.canvas.js contract.canvas.js
 RUN npm install --omit-dev
 
-CMD ["npm", "run", "start"]
+CMD ["npx", "canvas", "run", "/data/app", "--init", "contract.canvas.js", "--metrics"]

examples/chat-server/README.md

@@ -0,0 +1,25 @@
+# @canvas-js/example-chat-server
+
+This is an example of a replication server for a the `chat-example.canvas.xyz` chat application.
+
+## Local development
+
+Run `npm run dev` to start a temporary in-memory server, or `npm run start` to persist data to a `.cache` directory.
+
+## Deploying to Fly
+
+If you're forking this example and/or running it with a different contract, be sure to edit `fly.toml` and change
+
+- the Fly app name
+- the `ANNOUNCE` environment variable to match your Fly app name
+- the data source name (from `canvas_chat_data`) to your own Fly volume
+
+Then deploy with
+
+```
+fly deploy
+```
+
+## Running the Docker container locally
+
+Mount a volume to `/data`. Set the `PORT`, `LISTEN`, `ANNOUNCE`, and `BOOTSTRAP_LIST` environment variables if appropriate.

examples/chat-server/contract.canvas.js

@@ -1,18 +1,18 @@
-export const topic = "chat-example.canvas.xyz";
+export const topic = "chat-example.canvas.xyz"
 
 export const models = {
-  message: {
-    id: "primary",
-    user: "string",
-    content: "string",
-    timestamp: "integer",
-    $indexes: ["user", "timestamp"],
-  },
-};
+	message: {
+		id: "primary",
+		address: "string",
+		content: "string",
+		timestamp: "integer",
+		$indexes: ["address", "timestamp"],
+	},
+}
 
 export const actions = {
-  async createMessage(db, { content }, { id, chain, address, timestamp }) {
-    const user = `${chain}:${address}`;
-    await db.set("message", { id, user, content, timestamp });
-  },
-};
+	async createMessage(db, { content }, { id, address, timestamp }) {
+		console.log("received message:", content)
+		await db.set("message", { id, address, content, timestamp })
+	},
+}

examples/chat-server/fly.toml

@@ -7,6 +7,8 @@ processes = []
 
 [env]
   DEBUG = "canvas:*:error"
+  LISTEN=/ip6/::/tcp/8080/ws
+  ANNOUNCE=/dns4/canvas-chat.fly.dev/tcp/443/wss
 
 [mounts]
   destination = "/data"

examples/chat-server/package.json

@@ -4,7 +4,8 @@
   "version": "0.8.14",
   "type": "module",
   "scripts": {
-    "start": "canvas run /data/app --init contract.canvas.js --verbose --metrics --listen /ip6/::/tcp/8080/ws --announce /dns4/canvas-chat.fly.dev/tcp/443/wss"
+    "dev": "canvas run contract.canvas.js",
+    "start": "canvas run .cache --init contract.canvas.js"
   },
   "dependencies": {
     "@canvas-js/cli": "0.8.14"