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feat: improve Lit client robustness for message handling #419

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feat: improve Lit client robustness for message handling #419

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38 changes: 35 additions & 3 deletions samples/client/lit/shell/client.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -97,13 +97,45 @@ export class A2UIClient {
}

const result = (response as SendMessageSuccessResponse).result as Task;
if (result.kind === "task" && result.status.message?.parts) {
console.debug("Full Server Response Result:", JSON.stringify(result, null, 2));

let responseParts = result.status.message?.parts;

// Fallback: If no parts in status.message, check the last agent message in history
if (!responseParts && result.history && result.history.length > 0) {
// Iterate backwards to find the last agent message
for (let i = result.history.length - 1; i >= 0; i--) {
const msg = result.history[i];
if (msg.role === 'agent' && msg.parts && msg.parts.length > 0) {
responseParts = msg.parts;
console.debug("Found parts in history at index", i);
break;
}
}
}

if (result.kind === "task" && responseParts) {
const messages: v0_8.Types.ServerToClientMessage[] = [];
for (const part of result.status.message.parts) {
for (const part of responseParts) {
console.debug("Client Received part:", JSON.stringify(part, null, 2));

if (part.kind === 'data') {
messages.push(part.data as v0_8.Types.ServerToClientMessage);
let data = part.data;
// Handle string-encoded JSON data parts
if (typeof data === 'string') {
try {
data = JSON.parse(data);
console.debug("Parsed string data:", data);
} catch (e) {
console.error("Failed to parse part.data string:", e);
}
}
messages.push(data as v0_8.Types.ServerToClientMessage);
} else if (part.kind === 'text') {
console.debug("Ignored text part:", part.text);
}
}
console.debug("Final messages to process:", messages);
return messages;
}

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