Add support for Deno with an index-deno.ts

.github/workflows/ci.yml

@@ -55,6 +55,9 @@ jobs:
     - uses: actions/[email protected]
       with:
         node-version: '14'
+    - uses: denoland/setup-deno@v1
+      with:
+        deno-version: v1.x
     - run: cd bin/wasm-node/javascript && RUSTFLAGS=-Dwarnings npm install-ci-test
 
   wasm-node-size-diff:

bin/wasm-node/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Added
+
+- Add support for Deno. Smoldot is now available on the deno.land/x package registry. This doesn't modify anything to the behaviour of the smoldot NPM package. ([#2522](https://github.com/paritytech/smoldot/pull/2522))
+
 ## 0.6.25 - 2022-07-18
 
 ### Added

bin/wasm-node/javascript/demo/demo-deno.ts

@@ -0,0 +1,87 @@
+// Smoldot
+// Copyright (C) 2019-2022  Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+// This file launches a WebSocket server that exposes JSON-RPC functions.
+
+import * as smoldot from '../dist/mjs/index-deno.js';
+
+// Load the chain spec file.
+const chainSpec = new TextDecoder("utf-8").decode(await Deno.readFile("../../westend.json"));
+
+const client = smoldot.start({
+    maxLogLevel: 3,  // Can be increased for more verbosity
+    forbidTcp: false,
+    forbidWs: false,
+    forbidNonLocalWs: false,
+    forbidWss: false,
+    cpuRateLimit: 0.5,
+    logCallback: (_level, target, message) => {
+        // As incredible as it seems, there is currently no better way to print the current time
+        // formatted in a certain way.
+        const now = new Date();
+        const hours = ("0" + now.getHours()).slice(-2);
+        const minutes = ("0" + now.getMinutes()).slice(-2);
+        const seconds = ("0" + now.getSeconds()).slice(-2);
+        const milliseconds = ("00" + now.getMilliseconds()).slice(-3);
+        console.log(
+            "[%s:%s:%s.%s] [%s] %s",
+            hours, minutes, seconds, milliseconds, target, message
+        );
+    }
+});
+
+// We add the chain ahead of time in order to preload it.
+// Once a client connects, the chain is added again, but smoldot is smart enough to not connect
+// a second time.
+client.addChain({ chainSpec });
+
+// Now spawn a WebSocket server in order to handle JSON-RPC clients.
+console.log('JSON-RPC server now listening on port 9944');
+console.log('Please visit: https://polkadot.js.org/apps/?rpc=ws%3A%2F%2F127.0.0.1%3A9944');
+
+const conn = Deno.listen({ port: 9944 });
+const httpConn = Deno.serveHttp(await conn.accept());
+
+while(true) {
+    const event = await httpConn.nextRequest();
+    if (!event)
+        continue;
+
+    console.log('(demo) New JSON-RPC client connected.');
+
+    const { socket, response } = Deno.upgradeWebSocket(event.request);
+
+    const chain = await client.addChain({
+        chainSpec,
+        jsonRpcCallback: (response) => socket.send(response)
+    });
+
+    socket.onclose = () => {
+        console.log("(demo) JSON-RPC client disconnected.");
+        chain.remove();
+    };
+
+    socket.onmessage = (event: Deno.MessageEvent) => {
+        if (typeof event.data === 'string') {
+            chain.sendJsonRpc(event.data);
+        } else {
+            socket.close(1002); // Protocol error
+        }
+    };
+
+    event.respondWith(response);
+}

bin/wasm-node/javascript/package.json

@@ -31,7 +31,7 @@
     "prepublishOnly": "node prepare.mjs --release && rimraf ./dist && npm run buildModules",
     "build": "node prepare.mjs --release && rimraf ./dist && npm run buildModules",
     "start": "node prepare.mjs --debug && rimraf ./dist && npm run buildModules && node demo/demo.mjs",
-    "test": "node prepare.mjs --debug && rimraf ./dist && npm run buildModules && ava --timeout=2m --concurrency 2 --no-worker-threads"
+    "test": "node prepare.mjs --debug && rimraf ./dist && npm run buildModules && deno run ./dist/mjs/index-deno.js && ava --timeout=2m --concurrency 2 --no-worker-threads"
   },
   "dependencies": {
     "websocket": "^1.0.32"