Timothy J. Aveni
34 lines
1.4 KiB
JavaScript
34 lines
1.4 KiB
JavaScript
/** Execution completion, not HTTP disconnection, is the drain boundary. */
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export const createInvocationRegistry = () => {
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const entries = new Map();
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return {
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begin(id) {
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if (!id || entries.has(id))
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throw new Error("Invocation ID is missing or already used; invocations are never replayed implicitly");
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// Completed identities remain until process retirement. A bounded process
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// may reject new work; it must not evict and accidentally replay a call.
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if (entries.size >= 100_000)
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throw new Error("Invocation registry full; explicit runtime retirement required");
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const entry = { state: "running", controller: new AbortController() };
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entries.set(id, entry);
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return {
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signal: entry.controller.signal,
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finish(failed = false) {
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entry.state = failed ? "failed" : "completed";
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},
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};
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},
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status(id) {
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return { invocationId: id, state: entries.get(id)?.state ?? "unknown" };
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},
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cancel(id) {
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const entry = entries.get(id);
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if (entry && ["running", "cancellation-requested"].includes(entry.state)) {
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entry.state = "cancellation-requested";
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entry.controller.abort();
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}
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return this.status(id);
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},
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};
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};
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