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| 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 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 6x 6x 6x 6x 2x 3x 3x 2x 6x 7x 7x 2x 5x 5x 5x 4x 1x 6x 1x 6x 6x 6x 10x 10x 1x 1x 9x 9x 9x 9x 1x 1x 1x 1x 9x 9x 9x 9x 9x 1x 1x 1x 1x 1x 1x | export type WorkerRequestMessage<TInput> = {
requestId: number;
input: TInput;
};
export type WorkerResponseMessage<TOutput> =
| {
requestId: number;
success: true;
output: TOutput;
}
| {
requestId: number;
success: false;
error: string;
};
type PendingRequest<TOutput> = {
resolve: (output: TOutput) => void;
reject: (error: Error) => void;
removeAbortListener?: () => void;
};
export type WorkerRequestOptions = {
signal?: AbortSignal;
};
export type WorkerClient<TInput, TOutput> = {
request: (input: TInput, options?: WorkerRequestOptions) => Promise<TOutput>;
dispose: () => void;
};
export const isWorkerRequestAbortError = (error: unknown) =>
error instanceof Error && error.name === "AbortError";
const abortError = () => {
const error = new Error("Worker request aborted");
error.name = "AbortError";
return error;
};
const errorMessage = (error: unknown) =>
error instanceof Error ? error.message : String(error);
export const createWorkerRequestHandler =
<TInput, TOutput>(
worker: Pick<Worker, "postMessage">,
handler: (input: TInput) => TOutput | Promise<TOutput>,
) =>
async (event: MessageEvent<WorkerRequestMessage<TInput>>): Promise<void> => {
const { requestId, input } = event.data;
try {
const output = await handler(input);
worker.postMessage({
requestId,
success: true,
output,
} satisfies WorkerResponseMessage<TOutput>);
} catch (error) {
worker.postMessage({
requestId,
success: false,
error: errorMessage(error),
} satisfies WorkerResponseMessage<TOutput>);
}
};
export const createWorkerClient = <TInput, TOutput>(
worker: Worker,
): WorkerClient<TInput, TOutput> => {
let nextRequestId = 0;
let disposed = false;
const pending = new Map<number, PendingRequest<TOutput>>();
const rejectAll = (error: Error) => {
pending.forEach((request) => {
request.removeAbortListener?.();
request.reject(error);
});
pending.clear();
};
const onMessage = (event: MessageEvent<WorkerResponseMessage<TOutput>>) => {
const request = pending.get(event.data.requestId);
if (!request) {
return;
}
pending.delete(event.data.requestId);
request.removeAbortListener?.();
if (event.data.success) {
request.resolve(event.data.output);
} else {
request.reject(new Error(event.data.error));
}
};
const onError = (event: ErrorEvent) => {
rejectAll(new Error(event.message || "Worker request failed"));
};
worker.addEventListener("message", onMessage);
worker.addEventListener("error", onError);
return {
request: (input, options = {}) =>
new Promise<TOutput>((resolve, reject) => {
if (disposed) {
reject(new Error("Worker client has been disposed"));
return;
}
Iif (options.signal?.aborted) {
reject(abortError());
return;
}
nextRequestId += 1;
const requestId = nextRequestId;
const onAbort = () => {
const request = pending.get(requestId);
Iif (!request) {
return;
}
pending.delete(requestId);
request.reject(abortError());
};
const removeAbortListener = options.signal
? () => options.signal?.removeEventListener("abort", onAbort)
: undefined;
pending.set(requestId, {
resolve,
reject,
removeAbortListener,
});
options.signal?.addEventListener("abort", onAbort, { once: true });
try {
worker.postMessage({
requestId,
input,
} satisfies WorkerRequestMessage<TInput>);
} catch (error) {
pending.delete(requestId);
removeAbortListener?.();
reject(
error instanceof Error
? error
: new Error("Unable to start worker request"),
);
}
}),
dispose: () => {
Iif (disposed) {
return;
}
disposed = true;
worker.removeEventListener("message", onMessage);
worker.removeEventListener("error", onError);
rejectAll(new Error("Worker client has been disposed"));
worker.terminate();
},
};
};
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