Added the starter client template (#14)

docker/code-templates/nodejs/starter-client/_projname_.js

@@ -0,0 +1,120 @@
+const fs = require('fs');
+const readline = require('readline');
+const HotPocket = require('hotpocket-js-client');
+
+async function clientApp() {
+
+    const keyFile = 'user.key';
+
+    // Re-generate a user key pair for the client.
+    if (process.argv[2] == 'generatekeys' || !fs.existsSync(keyFile)) {
+        const newKeyPair = await HotPocket.generateKeys();
+        const saveData = Buffer.from(newKeyPair.privateKey).toString('hex');
+        fs.writeFileSync(keyFile, saveData);
+        console.log('New key pair generated.');
+
+        if (process.argv[2] == 'generatekeys') {
+            const pkhex = Buffer.from(newKeyPair.publicKey).toString('hex');
+            console.log('My public key is: ' + pkhex);
+            return;
+        }
+    }
+
+    // Generate the key pair using saved private key data.
+    const savedPrivateKeyHex = fs.readFileSync(keyFile).toString();
+    const userKeyPair = await HotPocket.generateKeys(savedPrivateKeyHex);
+
+    const pkhex = Buffer.from(userKeyPair.publicKey).toString('hex');
+    console.log('My public key is: ' + pkhex);
+
+    // Simple connection to single server without any validations.
+    const ip = process.argv[2] || 'localhost';
+    const port = process.argv[3] || '8081';
+    const client = await HotPocket.createClient(
+        ['wss://' + ip + ':' + port],
+        userKeyPair
+    );
+
+    client.on(HotPocket.events.disconnect, () => {
+        console.log('Disconnected');
+        rl.close();
+    })
+
+    // This will get fired as servers connects/disconnects.
+    client.on(HotPocket.events.connectionChange, (server, action) => {
+        console.log(server + " " + action);
+    })
+
+    // This will get fired when contract sends outputs.
+    client.on(HotPocket.events.contractOutput, (r) => {
+        r.outputs.forEach(o => {
+            if (o?.type == 'data_result') {
+                console.log('\x1b[32m%s\x1b[0m', `Output >> ${o.data}`);
+            } else if (o?.type == 'error') {
+                console.log('\x1b[31m%s\x1b[0m', `Error >> ${o.error}`);
+            }
+        });
+    })
+
+
+    // Establish HotPocket connection.
+    if (!await client.connect()) {
+        console.log('Connection failed.');
+        return;
+    }
+
+    console.log('HotPocket Connected.');
+
+    // start listening for stdin
+    const rl = readline.createInterface({
+        input: process.stdin,
+        output: process.stdout
+    });
+
+    // On ctrl + c we should close HP connection gracefully.
+    rl.on('SIGINT', () => {
+        console.log('SIGINT received...');
+        rl.close();
+        client.close();
+    });
+
+    console.log('\x1b[36m%s\x1b[0m',"Run 'help' for more information on commands.");
+    console.log("Ready to accept inputs.");
+
+    const input_pump = () => {
+        rl.question('', (inp) => {
+
+
+            if (inp.length > 0) {
+                if (inp.startsWith("help")) {
+                    console.log('\x1b[36m%s\x1b[0m', `
+    Commands :
+    set <text>  -- To write some text to a file on the contract side.
+    get         -- To retrieve the written content.
+                    `);
+                } else {
+                    if (inp.startsWith("set ")) {
+                        inp = JSON.stringify({ type: "set", data: inp.substr(4) });
+                    }
+
+                    else if (inp.startsWith("get")) {
+                        inp = JSON.stringify({ type: "get" });
+                    }
+
+                    client.submitContractInput(inp).then(input => {
+                        input.submissionStatus.then(s => {
+                            if (s.status != "accepted")
+                                console.log(s.reason);
+                        });
+                    });
+                }
+
+            }
+
+            input_pump();
+        })
+    }
+    input_pump();
+}
+
+clientApp();

docker/code-templates/nodejs/starter-client/package.json

@@ -0,0 +1,6 @@
+{
+    "name": "_projname_",
+    "dependencies": {
+        "hotpocket-js-client": "0.5.3"
+    }
+}