#213 integrate dotenv for environment variable management

.gitignore

@@ -1,3 +1,4 @@
+.env
 
 dist/
 docs/

packages/node/.env.example

@@ -0,0 +1,4 @@
+ADDRESSES=/ip4/0.0.0.0/tcp/50000/ws,/ip4/0.0.0.0/tcp/50001
+BOOTSTRAP=true
+BOOTSTRAP_PEERS=/dns4/relay.droak.sh/tcp/443/wss/p2p/Qma3GsJmB47xYuyahPZPSadh1avvxfyYQwk8R3UnFrQ6aP
+PRIVATE_KEY_SEED=example

packages/node/package.json

@@ -39,6 +39,7 @@
   "@chainsafe/libp2p-gossipsub": "^14.1.0",
   "@grpc/grpc-js": "^1.12.2",
   "@libp2p/interface": "^2.1.3",
+  "dotenv": "^16.4.5",
   "@topology-foundation/blueprints": "0.2.1-4",
   "@topology-foundation/network": "0.2.1-4",
   "@topology-foundation/object": "0.2.1-4",

packages/node/src/config.ts

@@ -0,0 +1,38 @@
+import fs from "node:fs";
+import * as dotenv from "dotenv";
+import type { TopologyNodeConfig } from "./index.js";
+
+export function loadConfig(
+	configPath?: string | undefined,
+): TopologyNodeConfig {
+	let config: TopologyNodeConfig = {};
+
+	if (configPath) {
+		config = JSON.parse(fs.readFileSync(configPath, "utf8"));
+		return config;
+	}
+
+	const result = dotenv.config();
+	if (!result.error) {
+		config.network_config = {
+			addresses: process.env.ADDRESSES
+				? process.env.ADDRESSES.split(",")
+				: undefined,
+			bootstrap: process.env.BOOTSTRAP
+				? process.env.BOOTSTRAP === "true"
+				: undefined,
+			bootstrap_peers: process.env.BOOTSTRAP_PEERS
+				? process.env.BOOTSTRAP_PEERS.split(",")
+				: undefined,
+			browser_metrics: process.env.BROWSER_METRICS
+				? process.env.BROWSER_METRICS === "true"
+				: undefined,
+			private_key_seed: process.env.PRIVATE_KEY_SEED
+				? process.env.PRIVATE_KEY_SEED
+				: undefined,
+		};
+		return config;
+	}
+
+	return config;
+}

packages/node/src/run.ts

@@ -1,15 +1,13 @@
-import fs from "node:fs";
 import { program } from "./cli/index.js";
-import { TopologyNode, type TopologyNodeConfig } from "./index.js";
+import { loadConfig } from "./config.js";
+import { TopologyNode } from "./index.js";
+import type { TopologyNodeConfig } from "./index.js";
 import { init as rpc_init } from "./rpc/index.js";
 
 const run = async () => {
 	program.parse(process.argv);
 	const opts = program.opts();
-	let config: TopologyNodeConfig | undefined;
-	if (opts.config) {
-		config = JSON.parse(fs.readFileSync(opts.config, "utf8"));
-	}
+	const config: TopologyNodeConfig = loadConfig(opts.config);
 
 	const node = new TopologyNode(config);
 	await node.start();

packages/node/src/version.ts

@@ -1 +1 @@
-export const VERSION = "0.2.1-3";
+export const VERSION = "0.2.1-4";