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/** |
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* request.js — Raw HTTP primitives for the ZipWP chat assistant. |
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* |
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* All methods read auth token and base URL from window.ZIP_AI_CONFIG at |
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* call-time so they work correctly after config is set by WordPress. |
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* |
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* Flow: request.js → api.js (endpoints) → actions/ (store updates) → components |
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*/ |
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|
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const getBaseUrl = () => |
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(window.ZIP_AI_CONFIG?.apiUrl || '/api').replace(/\/+$/, ''); |
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|
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// ─── Abort controller ───────────────────────────────────────────────────────── |
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// Tracks the active SSE stream so it can be cancelled on demand. |
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|
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let _abortController = null; |
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|
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export function abortCurrentStream() { |
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if (_abortController) { |
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_abortController.abort(); |
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_abortController = null; |
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} |
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} |
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|
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export function createSignal() { |
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_abortController = new AbortController(); |
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return _abortController.signal; |
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} |
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|
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const getToken = () => window.ZIP_AI_CONFIG?.token; |
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|
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/** |
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* Build default request headers. |
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* @param {boolean} sse - If true, set Accept: text/event-stream. |
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* @returns {Record<string, string>} |
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*/ |
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export function buildHeaders(sse = false) { |
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const token = getToken(); |
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return { |
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'Content-Type': 'application/json', |
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Accept: sse ? 'text/event-stream' : 'application/json', |
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...(token && { Authorization: `Bearer ${token}` }), |
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}; |
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} |
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|
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/** |
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* Resolve a relative endpoint to an absolute URL. |
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* @param {string} endpoint - Path like '/agent/chat/stream' or full URL |
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* @returns {string} |
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*/ |
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export function resolveUrl(endpoint) { |
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return endpoint.startsWith('http') ? endpoint : `${getBaseUrl()}${endpoint}`; |
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} |
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|
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/** |
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* GET request — returns parsed JSON. |
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* @param {string} endpoint |
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* @param {RequestInit} [init] |
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* @returns {Promise<unknown>} |
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*/ |
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export async function get(endpoint, init = {}) { |
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const response = await fetch(resolveUrl(endpoint), { |
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method: 'GET', |
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...init, |
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headers: { ...buildHeaders(), ...init.headers }, |
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}); |
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|
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if (!response.ok) { |
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const error = await response.json().catch(() => ({})); |
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throw new Error(error.message || `API Error: ${response.status}`); |
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} |
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|
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return response.json(); |
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} |
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|
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/** |
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* POST request — returns parsed JSON. |
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* @param {string} endpoint |
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* @param {unknown} body - Will be JSON.stringify'd unless already a string. |
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* @param {RequestInit} [init] |
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* @returns {Promise<unknown>} |
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*/ |
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export async function post(endpoint, body = {}, init = {}) { |
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const response = await fetch(resolveUrl(endpoint), { |
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method: 'POST', |
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...init, |
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headers: { ...buildHeaders(), ...init.headers }, |
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body: typeof body === 'string' ? body : JSON.stringify(body), |
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}); |
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|
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if (!response.ok) { |
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const error = await response.json().catch(() => ({})); |
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throw new Error(error.message || `API Error: ${response.status}`); |
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} |
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|
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return response.json(); |
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} |
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|
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/** |
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* DELETE request — returns parsed JSON. |
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* @param {string} endpoint |
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* @param {RequestInit} [init] |
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* @returns {Promise<unknown>} |
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*/ |
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export async function del(endpoint, init = {}) { |
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const response = await fetch(resolveUrl(endpoint), { |
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method: 'DELETE', |
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...init, |
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headers: { ...buildHeaders(), ...init.headers }, |
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}); |
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|
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if (!response.ok) { |
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const error = await response.json().catch(() => ({})); |
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throw new Error(error.message || `API Error: ${response.status}`); |
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} |
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|
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return response.json(); |
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} |
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|
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/** |
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* Parse a single raw SSE event string into { type, data }. |
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* @param {string} raw - e.g. "event: text_delta\ndata: {...}" |
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* @returns {{ type: string, data: unknown } | null} |
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*/ |
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export function parseSSEEvent(raw) { |
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const lines = raw.split('\n'); |
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let eventType = 'message'; |
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let dataStr = ''; |
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|
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for (const line of lines) { |
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if (line.startsWith('event:')) { |
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eventType = line.slice(6).trim(); |
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} else if (line.startsWith('data:')) { |
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dataStr += line.slice(5).trim(); |
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} |
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} |
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|
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if (!dataStr) return null; |
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|
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try { |
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return { type: eventType, data: JSON.parse(dataStr) }; |
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} catch { |
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return null; |
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} |
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} |
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|
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/** |
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* POST a streaming (SSE) request and process the event stream. |
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* |
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* Calls onEvent(type, data) for every SSE event except 'complete' (handled |
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* internally). Returns the final result from the 'complete' event. |
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* |
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* @param {string} endpoint |
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* @param {unknown} body |
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* @param {Function|null} onEvent - (type: string, data: unknown) => void |
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* @param {AbortSignal} [signal] - Optional AbortSignal for cancellation |
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* @returns {Promise<unknown>} Final result from 'complete' event |
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*/ |
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export async function stream(endpoint, body, onEvent = null, signal = null) { |
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// Auto-create abort controller if caller didn't supply a signal |
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const activeSignal = signal ?? createSignal(); |
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|
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const response = await fetch(resolveUrl(endpoint), { |
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method: 'POST', |
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headers: buildHeaders(true), |
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body: typeof body === 'string' ? body : JSON.stringify(body), |
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signal: activeSignal, |
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}); |
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|
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if (!response.ok) { |
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const error = await response.json().catch(() => ({})); |
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throw new Error(error.message || `API Error: ${response.status}`); |
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} |
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|
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return readSSEStream(response, onEvent); |
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} |
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|
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/** |
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* Inactivity timeout for SSE streams (ms). Resets on every chunk received. |
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* |
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* Must exceed the server-side `turn_timeout_ms` (default 120_000 in |
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* config/agent-brain.php). The brain also emits a named `heartbeat` event |
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* every 10s while awaiting the LLM's first token, so this ceiling should |
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* effectively never be hit — it's defense-in-depth for cases where the |
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* heartbeat path is blocked (proxy / brain crash / network issue). |
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*/ |
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const SSE_INACTIVITY_TIMEOUT = 150_000; |
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|
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/** |
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* Read and parse an SSE stream from a fetch Response. |
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* Throws if no data arrives for SSE_INACTIVITY_TIMEOUT ms. |
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* |
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* @param {Response} response |
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* @param {Function|null} onEvent |
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* @returns {Promise<unknown>} |
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*/ |
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export async function readSSEStream(response, onEvent = null) { |
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const reader = response.body.getReader(); |
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const decoder = new TextDecoder(); |
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let buffer = ''; |
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let finalResult = null; |
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let inactivityTimer = null; |
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|
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const resetTimer = () => { |
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if (inactivityTimer) clearTimeout(inactivityTimer); |
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inactivityTimer = setTimeout(() => { |
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reader.cancel(); |
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}, SSE_INACTIVITY_TIMEOUT); |
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}; |
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|
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resetTimer(); |
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|
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try { |
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while (true) { |
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const { done, value } = await reader.read(); |
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if (done) break; |
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|
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resetTimer(); |
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|
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buffer += decoder.decode(value, { stream: true }); |
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|
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const events = buffer.split('\n\n'); |
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buffer = events.pop() || ''; |
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|
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for (const raw of events) { |
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if (!raw.trim()) continue; |
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|
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const parsed = parseSSEEvent(raw); |
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if (!parsed) continue; |
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|
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switch (parsed.type) { |
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case 'complete': { |
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const streamedComponents = finalResult?.messageComponents; |
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finalResult = { ...finalResult, ...parsed.data }; |
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if (streamedComponents?.length) { |
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finalResult.messageComponents = streamedComponents; |
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} |
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continue; // internal only — do not dispatch |
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} |
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case 'error': |
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throw new Error(parsed.data.message || 'Stream error'); |
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case 'image_generation_complete': |
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if (!finalResult) finalResult = {}; |
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finalResult.generatedImages = parsed.data.images; |
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break; |
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case 'message_component': |
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// Components are handled in real-time by the onEvent callback |
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// (chatActions.js addMessage). Don't accumulate here to avoid duplication. |
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break; |
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} |
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|
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if (onEvent) onEvent(parsed.type, parsed.data); |
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} |
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} |
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} catch (err) { |
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if (err.message?.includes('cancelled') || err.message?.includes('canceled')) { |
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throw new Error('The response took too long. Please try again.'); |
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} |
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throw err; |
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} finally { |
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if (inactivityTimer) clearTimeout(inactivityTimer); |
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reader.releaseLock(); |
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} |
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|
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return finalResult; |
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} |
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|
