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0ed8124 3fd9ca4 0ed8124 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | import { EngineRuntimeError } from './errors';
import type {
EngineErrorPayload,
EngineEvent,
EngineMethod,
EngineRequest,
EngineResponse,
EngineResponseMap,
EngineWorkerMessage,
} from './protocol';
import { BrowserEngineRuntime } from './runtime';
interface WorkerScope {
onmessage: ((event: MessageEvent<EngineRequest>) => void) | null;
postMessage(message: EngineWorkerMessage): void;
}
interface ActiveOperation {
controller: AbortController;
promise: Promise<unknown>;
}
const scope = globalThis as unknown as WorkerScope;
const runtime = new BrowserEngineRuntime();
const active = new Map<string, ActiveOperation>();
let quiescing = false;
function postEvent(event: EngineEvent): void {
scope.postMessage(event);
}
function postSuccess<Method extends EngineMethod>(
request: { requestId: string; method: Method },
result: EngineResponseMap[Method],
): void {
scope.postMessage({
type: 'response',
requestId: request.requestId,
method: request.method,
ok: true,
result,
} as EngineResponse);
}
function errorPayload(error: unknown): EngineErrorPayload {
if (error instanceof EngineRuntimeError) {
return {
code: error.code,
message: error.message,
...(error.details === undefined ? {} : { details: error.details }),
};
}
if (error instanceof DOMException && error.name === 'AbortError') {
return { code: 'ABORTED', message: error.message };
}
if (error instanceof Error) {
return {
code: error.name === 'AbortError' ? 'ABORTED' : 'ENGINE_ERROR',
message: error.message,
};
}
return { code: 'ENGINE_ERROR', message: String(error) };
}
function postFailure(request: { requestId: string; method: EngineMethod }, error: unknown): void {
scope.postMessage({
type: 'response',
requestId: request.requestId,
method: request.method,
ok: false,
error: errorPayload(error),
} as EngineResponse);
}
async function runExclusive<Result>(
requestId: string,
operation: (signal: AbortSignal) => Promise<Result>,
): Promise<Result> {
if (quiescing || active.size > 0) {
throw new EngineRuntimeError(
'ENGINE_BUSY',
quiescing
? 'The engine is unloading or clearing storage.'
: `Another mutable engine operation is active (${[...active.keys()].join(', ')}).`,
);
}
const controller = new AbortController();
const promise = operation(controller.signal);
active.set(requestId, { controller, promise });
try {
return await promise;
} finally {
active.delete(requestId);
}
}
async function stopActiveOperations(): Promise<void> {
const operations = [...active.values()];
for (const operation of operations) {
operation.controller.abort();
}
await Promise.allSettled(operations.map((operation) => operation.promise));
}
async function runQuiesced<Result>(operation: () => Promise<Result>): Promise<Result> {
if (quiescing) {
throw new EngineRuntimeError('ENGINE_BUSY', 'The engine is already unloading or clearing storage.');
}
quiescing = true;
try {
await stopActiveOperations();
return await operation();
} finally {
quiescing = false;
}
}
async function handleRequest(request: EngineRequest): Promise<void> {
try {
switch (request.method) {
case 'capabilities':
postSuccess(request, await runtime.capabilities());
return;
case 'loadModel':
postSuccess(
request,
await runExclusive(request.requestId, (signal) => (
runtime.loadModel(request.requestId, request.params, signal, postEvent)
)),
);
return;
case 'generate':
postSuccess(
request,
await runExclusive(request.requestId, (signal) => (
runtime.generate(request.requestId, request.params, signal, postEvent)
)),
);
return;
case 'scoreSequence':
postSuccess(
request,
await runExclusive(request.requestId, (signal) => (
runtime.scoreSequence(request.params, signal)
)),
);
return;
case 'abort': {
const operation = active.get(request.params.targetRequestId);
const aborted = operation !== undefined && !operation.controller.signal.aborted;
operation?.controller.abort();
postSuccess(request, { targetRequestId: request.params.targetRequestId, aborted });
return;
}
case 'unload':
postSuccess(request, await runQuiesced(() => runtime.unload()));
return;
case 'backendReport':
postSuccess(request, await runtime.backendReport());
return;
case 'storageEstimate':
postSuccess(request, await runtime.storageEstimate());
return;
case 'storagePersist':
postSuccess(request, await runtime.storagePersist());
return;
case 'storageClear':
postSuccess(request, await runQuiesced(() => runtime.storageClear()));
return;
}
} catch (error) {
postFailure(request, error);
}
}
scope.onmessage = (event) => {
const request = event.data;
if (request?.type === 'request' && typeof request.requestId === 'string') {
void handleRequest(request);
}
};
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