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/* eslint-env browser */
import {promiseWithResolvers} from '../../shared-util/sugar.js';
import {dispatchInternalEvent} from '../client-util.js';
export const info = {
id: 'wikiSearchInfo',
state: {
worker: null,
workerReadyPromise: null,
workerReadyPromiseResolvers: null,
workerActionCounter: 0,
workerActionPromiseResolverMap: new Map(),
downloads: Object.create(null),
},
event: {
whenWorkerAlive: [],
whenWorkerReady: [],
whenWorkerFailsToInitialize: [],
whenWorkerHasRuntimeError: [],
whenDownloadBegins: [],
whenDownloadsBegin: [],
whenDownloadProgresses: [],
whenDownloadEnds: [],
},
};
export async function initializeSearchWorker() {
const {state} = info;
if (state.worker) {
return await state.workerReadyPromise;
}
state.worker =
new Worker(
import.meta.resolve('../search-worker.js'),
{type: 'module'});
state.worker.onmessage = handleSearchWorkerMessage;
const {promise, resolve, reject} = promiseWithResolvers();
state.workerReadyPromiseResolvers = {resolve, reject};
return await (state.workerReadyPromise = promise);
}
function handleSearchWorkerMessage(message) {
switch (message.data.kind) {
case 'status':
handleSearchWorkerStatusMessage(message);
break;
case 'result':
handleSearchWorkerResultMessage(message);
break;
case 'download-begun':
handleSearchWorkerDownloadBegunMessage(message);
break;
case 'download-progress':
handleSearchWorkerDownloadProgressMessage(message);
break;
case 'download-complete':
handleSearchWorkerDownloadCompleteMessage(message);
break;
default:
console.warn(`Unknown message kind "${message.data.kind}" <- from search worker`);
break;
}
}
function handleSearchWorkerStatusMessage(message) {
const {state, event} = info;
switch (message.data.status) {
case 'alive':
console.debug(`Search worker is alive, but not yet ready.`);
dispatchInternalEvent(event, 'whenWorkerAlive');
break;
case 'ready':
console.debug(`Search worker has loaded corpuses and is ready.`);
state.workerReadyPromiseResolvers.resolve(state.worker);
dispatchInternalEvent(event, 'whenWorkerReady');
break;
case 'setup-error':
console.debug(`Search worker failed to initialize.`);
state.workerReadyPromiseResolvers.reject(new Error('Received "setup-error" status from worker'));
dispatchInternalEvent(event, 'whenWorkerFailsToInitialize');
break;
case 'runtime-error':
console.debug(`Search worker had an uncaught runtime error.`);
dispatchInternalEvent(event, 'whenWorkerHasRuntimeError');
break;
default:
console.warn(`Unknown status "${message.data.status}" <- from search worker`);
break;
}
}
function handleSearchWorkerResultMessage(message) {
const {state} = info;
const {id} = message.data;
if (!id) {
console.warn(`Result without id <- from search worker:`, message.data);
return;
}
if (!state.workerActionPromiseResolverMap.has(id)) {
console.warn(`Runaway result id <- from search worker:`, message.data);
return;
}
const {resolve, reject} =
state.workerActionPromiseResolverMap.get(id);
switch (message.data.status) {
case 'resolve':
resolve(message.data.value);
break;
case 'reject':
reject(message.data.value);
break;
default:
console.warn(`Unknown result status "${message.data.status}" <- from search worker`);
return;
}
state.workerActionPromiseResolverMap.delete(id);
}
function handleSearchWorkerDownloadBegunMessage(message) {
const {event} = info;
const {context: contextKey, keys} = message.data;
const context = getSearchWorkerDownloadContext(contextKey, true);
for (const key of keys) {
context[key] = 0.00;
dispatchInternalEvent(event, 'whenDownloadBegins', {
context: contextKey,
key,
});
}
dispatchInternalEvent(event, 'whenDownloadsBegin', {
context: contextKey,
keys,
});
}
function handleSearchWorkerDownloadProgressMessage(message) {
const {event} = info;
const {context: contextKey, key, progress} = message.data;
const context = getSearchWorkerDownloadContext(contextKey);
context[key] = progress;
dispatchInternalEvent(event, 'whenDownloadProgresses', {
context: contextKey,
key,
progress,
});
}
function handleSearchWorkerDownloadCompleteMessage(message) {
const {event} = info;
const {context: contextKey, key} = message.data;
const context = getSearchWorkerDownloadContext(contextKey);
context[key] = 1.00;
dispatchInternalEvent(event, 'whenDownloadEnds', {
context: contextKey,
key,
});
}
export function getSearchWorkerDownloadContext(context, initialize = false) {
const {state} = info;
if (context in state.downloads) {
return state.downloads[context];
}
if (!initialize) {
return null;
}
return state.downloads[context] = Object.create(null);
}
export async function postSearchWorkerAction(action, options) {
const {state} = info;
const worker = await initializeSearchWorker();
const id = ++state.workerActionCounter;
const {promise, resolve, reject} = promiseWithResolvers();
state.workerActionPromiseResolverMap.set(id, {resolve, reject});
worker.postMessage({
kind: 'action',
action: action,
id,
options,
});
return await promise;
}
export async function searchAll(query, options = {}) {
return await postSearchWorkerAction('search', {
query,
options,
});
}
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