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feat: playground network selector with API prefill #21

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8 changes: 8 additions & 0 deletions playground/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,14 @@ <h1>Arkade Playground</h1>
<span class="version" id="compiler-version"></span>
</div>
<div class="header-right">
<div class="network-selector">
<select id="network-select">
<option value="bitcoin">Bitcoin</option>
<option value="mutinynet">Mutinynet</option>
<option value="signet">Signet</option>
</select>
Comment on lines +18 to +22

@coderabbitai coderabbitai Bot Feb 23, 2026

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⚠️ Potential issue | 🟡 Minor

<select> is missing an accessible label.

Screen readers will announce this as an unlabeled combobox.

♿ Proposed fix 
-                <select id="network-select">
+                <select id="network-select" aria-label="Network">
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
<select id="network-select">
<option value="bitcoin">Bitcoin</option>
<option value="mutinynet">Mutinynet</option>
<option value="signet">Signet</option>
</select>
<select id="network-select" aria-label="Network">
<option value="bitcoin">Bitcoin</option>
<option value="mutinynet">Mutinynet</option>
<option value="signet">Signet</option>
</select>
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@playground/index.html` around lines 18 - 22, The <select> element with id
"network-select" is missing an accessible label; add an associated visible
<label> (e.g., <label for="network-select">Network</label>) placed before the
select, or if a visible label is not desired, add an explicit aria-label or
aria-labelledby that references an existing element, ensuring screen readers
announce the control (update the element with id "network-select" accordingly).

<span class="network-status" id="network-status" title="Fetching..."></span>
</div>
<button id="compile-btn" class="btn-primary">
<i class="fas fa-play"></i> Compile
</button>
Expand Down
80 changes: 75 additions & 5 deletions playground/main.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,62 @@
import initWasm, { compile, version, validate, init as initPanicHook } from './pkg/arkade_compiler.js';
import * as contracts from './contracts.js';

// ── Network configuration ────────────────────────────────────────
const NETWORKS = {
bitcoin: { name: 'Bitcoin', url: 'https://arkade.computer' },
mutinynet: { name: 'Mutinynet', url: 'https://mutinynet.arkade.sh' },
signet: { name: 'Signet', url: 'https://signet.arkade.sh' },
};

let selectedNetwork = 'bitcoin';
let networkInfo = null; // cached API response for current network

async function fetchNetworkInfo(networkKey) {
const net = NETWORKS[networkKey];
if (!net) return;

const statusEl = document.getElementById('network-status');
if (statusEl) {
statusEl.className = 'network-status loading';
statusEl.title = 'Fetching...';
}

try {
const resp = await fetch(`${net.url}/v1/info`);
if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
const data = await resp.json();
networkInfo = data;
if (statusEl) {
statusEl.className = 'network-status connected';
statusEl.title = `${net.name}: connected`;
}
} catch (e) {
console.warn(`Failed to fetch ${net.name} info:`, e);
networkInfo = null;
if (statusEl) {
statusEl.className = 'network-status error';
statusEl.title = `${net.name}: unreachable`;
}
}
}
Comment on lines +16 to +43

@coderabbitai coderabbitai Bot Feb 23, 2026 •
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⚠️ Potential issue | 🟠 Major

Stale-response race condition + no fetch timeout in fetchNetworkInfo.

Race condition: networkInfo and the status indicator are written unconditionally after await. When the startup fetch (line 1421, fire-and-forget) is still in-flight and the user switches networks, whichever request completes last overwrites networkInfo for the currently selected network. A slow bitcoin response completing after a mutinynet switch will silently inject bitcoin's signerPubkey into new files created on mutinynet.

No timeout: a slow or unreachable host leaves the status indicator in "loading" until the browser's own timeout (~30 s+), making the error state very slow to appear.

🐛 Proposed fix 
 async function fetchNetworkInfo(networkKey) {
     const net = NETWORKS[networkKey];
     if (!net) return;
 
     const statusEl = document.getElementById('network-status');
     if (statusEl) {
         statusEl.className = 'network-status loading';
         statusEl.title = 'Fetching...';
     }
 
     try {
-        const resp = await fetch(`${net.url}/v1/info`);
+        const controller = new AbortController();
+        const timeoutId = setTimeout(() => controller.abort(), 5000);
+        const resp = await fetch(`${net.url}/v1/info`, { signal: controller.signal });
+        clearTimeout(timeoutId);
         if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
         const data = await resp.json();
+        if (networkKey !== selectedNetwork) return; // discard stale response
         networkInfo = data;
         if (statusEl) {
             statusEl.className = 'network-status connected';
             statusEl.title = `${net.name}: connected`;
         }
     } catch (e) {
+        if (networkKey !== selectedNetwork) return; // discard stale error
         console.warn(`Failed to fetch ${net.name} info:`, e);
         networkInfo = null;
         if (statusEl) {
             statusEl.className = 'network-status error';
             statusEl.title = `${net.name}: unreachable`;
         }
     }
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
async function fetchNetworkInfo(networkKey) {
const net = NETWORKS[networkKey];
if (!net) return;
const statusEl = document.getElementById('network-status');
if (statusEl) {
statusEl.className = 'network-status loading';
statusEl.title = 'Fetching...';
}
try {
const resp = await fetch(`${net.url}/v1/info`);
if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
const data = await resp.json();
networkInfo = data;
if (statusEl) {
statusEl.className = 'network-status connected';
statusEl.title = `${net.name}: connected`;
}
} catch (e) {
console.warn(`Failed to fetch ${net.name} info:`, e);
networkInfo = null;
if (statusEl) {
statusEl.className = 'network-status error';
statusEl.title = `${net.name}: unreachable`;
}
}
}
async function fetchNetworkInfo(networkKey) {
const net = NETWORKS[networkKey];
if (!net) return;
const statusEl = document.getElementById('network-status');
if (statusEl) {
statusEl.className = 'network-status loading';
statusEl.title = 'Fetching...';
}
try {
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), 5000);
const resp = await fetch(`${net.url}/v1/info`, { signal: controller.signal });
clearTimeout(timeoutId);
if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
const data = await resp.json();
if (networkKey !== selectedNetwork) return; // discard stale response
networkInfo = data;
if (statusEl) {
statusEl.className = 'network-status connected';
statusEl.title = `${net.name}: connected`;
}
} catch (e) {
if (networkKey !== selectedNetwork) return; // discard stale error
console.warn(`Failed to fetch ${net.name} info:`, e);
networkInfo = null;
if (statusEl) {
statusEl.className = 'network-status error';
statusEl.title = `${net.name}: unreachable`;
}
}
}
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@playground/main.js` around lines 16 - 43, fetchNetworkInfo has a
stale-response race and no timeout: make each call use an AbortController with a
short timeout (clear the timer on completion) and attach a per-call token (e.g.,
incrementing requestId or store the current networkKey snapshot) so you only
assign networkInfo and update statusEl when the token matches the latest
outstanding request for that network; specifically, in fetchNetworkInfo use
NETWORKS[networkKey], create an AbortController + setTimeout to abort after the
desired timeout, await fetch(signal), and only set networkInfo and change
statusEl.className/title if the saved requestId/current selected networkKey
still matches, and ensure you handle abort/errors by setting networkInfo=null
and status to error, clearing timers and not leaking controllers.

@shubertm shubertm Mar 3, 2026

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can confirm this @tiero. I switched to signet from mutinynet and then back to mutinynet, then got a red dot. Switching to bitcoin and back again to mutinynet I got a green dot back.

@coderabbitai coderabbitai Bot Mar 3, 2026

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Seems like the humans are having a chat. I'll hop back into my burrow for now. If you need me again, just tag @coderabbitai in a new comment, and I'll come hopping out!


function getDefaultTemplate(fileName) {
const displayName = fileName.replace(/\.ark$/, '');
const net = NETWORKS[selectedNetwork];

let serverComment = '';
let exitValue = '144';
let renewValue = '1008';

if (networkInfo) {
serverComment = ` // Network: ${net.name} (${net.url})\n // Signer pubkey: ${networkInfo.signerPubkey}\n`;
exitValue = networkInfo.unilateralExitDelay || '144';
renewValue = '4032';
Comment on lines +53 to +56

@coderabbitai coderabbitai Bot Feb 23, 2026

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⚠️ Potential issue | 🟡 Minor

networkInfo.signerPubkey is not guarded against undefined.

If the /v1/info response omits the field (or the schema changes), the generated template will contain the literal string "undefined".

🐛 Proposed fix 
 if (networkInfo) {
-    serverComment = `  // Network: ${net.name} (${net.url})\n  // Signer pubkey: ${networkInfo.signerPubkey}\n`;
+    const pubkeyLine = networkInfo.signerPubkey
+        ? `  // Signer pubkey: ${networkInfo.signerPubkey}\n`
+        : '';
+    serverComment = `  // Network: ${net.name} (${net.url})\n${pubkeyLine}`;
     exitValue = networkInfo.unilateralExitDelay || '144';
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
if (networkInfo) {
serverComment = ` // Network: ${net.name} (${net.url})\n // Signer pubkey: ${networkInfo.signerPubkey}\n`;
exitValue = networkInfo.unilateralExitDelay || '144';
renewValue = '4032';
if (networkInfo) {
const pubkeyLine = networkInfo.signerPubkey
? ` // Signer pubkey: ${networkInfo.signerPubkey}\n`
: '';
serverComment = ` // Network: ${net.name} (${net.url})\n${pubkeyLine}`;
exitValue = networkInfo.unilateralExitDelay || '144';
renewValue = '4032';
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@playground/main.js` around lines 53 - 56, The template generation uses
networkInfo.signerPubkey directly when building serverComment, which will
interpolate "undefined" if absent; update the logic in playground/main.js (where
serverComment is set using networkInfo and net) to guard the field — e.g., check
networkInfo && networkInfo.signerPubkey (or use a safe fallback like an empty
string or "unknown") before interpolating into serverComment so the generated
template never contains the literal "undefined".

}

return `// ${displayName} Contract\n\noptions {\n${serverComment} server = server;\n\n // Batch expiry: ~4 weeks\n renew = ${renewValue};\n\n // Unilateral exit delay\n exit = ${exitValue};\n}\n\ncontract ${displayName}(\n pubkey user\n) {\n function spend(signature userSig) {\n require(checkSig(userSig, user));\n }\n}\n`;
}

// Projects: collections of related contracts
const projects = {
stability: {
Expand Down Expand Up @@ -41,7 +97,8 @@ const STORAGE_KEY = 'arkade-playground';
function saveToStorage() {
const data = {
projects: {},
examples: {}
examples: {},
selectedNetwork
};
// Only save user-created / modified entries
for (const [id, proj] of Object.entries(projects)) {
Expand All @@ -68,6 +125,9 @@ function loadFromStorage() {
examples[id] = ex;
}
}
if (data.selectedNetwork && NETWORKS[data.selectedNetwork]) {
selectedNetwork = data.selectedNetwork;
}
} catch (e) {
console.warn('Failed to load from localStorage:', e);
}
Expand Down Expand Up @@ -158,8 +218,7 @@ function createFileInFolder(folderId, fileName) {
const project = projects[folderId];
if (!project) return;
if (project.files[fileName]) return; // already exists
const defaultCode = `// ${fileName}\n\noptions {\n server = serverPk;\n exit = 144;\n}\n\ncontract MyContract(\n pubkey user\n) {\n function spend(signature userSig) {\n require(checkSig(userSig, user));\n }\n}\n`;
project.files[fileName] = defaultCode;
project.files[fileName] = getDefaultTemplate(fileName);
saveToStorage();
selectProjectFile(folderId, fileName);
}
Expand All @@ -168,8 +227,7 @@ function createStandaloneFile(name) {
if (!name.endsWith('.ark')) name += '.ark';
const displayName = name.replace(/\.ark$/, '');
const id = uniqueId(generateId(displayName), examples);
const defaultCode = `// ${displayName} Contract\n\noptions {\n server = serverPk;\n exit = 144;\n}\n\ncontract ${displayName}(\n pubkey user\n) {\n function spend(signature userSig) {\n require(checkSig(userSig, user));\n }\n}\n`;
examples[id] = { name: displayName, code: defaultCode };
examples[id] = { name: displayName, code: getDefaultTemplate(name) };
expandedFolders.add('_examples');
saveToStorage();
selectExample(id);
Expand Down Expand Up @@ -1350,6 +1408,18 @@ document.addEventListener('DOMContentLoaded', () => {
// Load user data from localStorage
loadFromStorage();

// Set up network selector
const networkSelect = document.getElementById('network-select');
networkSelect.value = selectedNetwork;
networkSelect.addEventListener('change', async () => {
selectedNetwork = networkSelect.value;
saveToStorage();
await fetchNetworkInfo(selectedNetwork);
});

// Fetch network info on startup
fetchNetworkInfo(selectedNetwork);

// Begin decoding URL hash early (async) so it's ready when Monaco is up
window._urlCodePromise = loadFromUrl();

Expand Down
48 changes: 48 additions & 0 deletions playground/style.css
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Expand Up @@ -82,6 +82,54 @@ select:hover {
border-color: var(--accent);
}

/* Network Selector */
.network-selector {
display: flex;
align-items: center;
gap: 0.5rem;
}

.network-selector select {
background: var(--bg-tertiary);
color: var(--text-primary);
border: 1px solid var(--border);
padding: 0.4rem 0.6rem;
border-radius: 4px;
font-size: 0.8125rem;
cursor: pointer;
}

.network-selector select:hover {
border-color: var(--accent);
}

.network-status {
width: 8px;
height: 8px;
border-radius: 50%;
background: var(--text-muted);
flex-shrink: 0;
transition: background 0.3s;
}

.network-status.loading {
background: var(--warning);
animation: status-pulse 1s ease infinite;
}

.network-status.connected {
background: var(--success);
}

.network-status.error {
background: var(--error);
}

@keyframes status-pulse {
0%, 100% { opacity: 1; }
50% { opacity: 0.4; }
}

.btn-primary {
background: var(--accent);
color: white;
Expand Down