Timothy J. Aveni
64 lines
3.1 KiB
JavaScript
64 lines
3.1 KiB
JavaScript
const checked = async (port, revision) => {
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const snapshot = await port.collection();
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if (snapshot.revision !== revision)
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throw new Error("STALE_COLLECTION_REVISION");
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return snapshot;
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};
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/** Helpers never retry a failed CAS or silently overwrite concurrent edits. */
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export const relationshipMap = (port) => ({
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read: () => port.collection(),
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async get(key) {
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const snapshot = await port.collection();
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return { revision: snapshot.revision, value: snapshot.entries.find((entry) => entry.key === key)?.target };
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},
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async set(key, target, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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const entries = snapshot.entries.filter((entry) => entry.key !== key);
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const existing = snapshot.entries.find((entry) => entry.key === key && entry.target.equals(target));
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entries.push(existing ?? { key, target });
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return port.replace(entries, expectedRevision);
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},
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async delete(key, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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return port.replace(snapshot.entries.filter((entry) => entry.key !== key), expectedRevision);
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},
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});
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export const relationshipList = (port) => ({
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read: () => port.collection(),
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async insert(index, target, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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if (!Number.isSafeInteger(index) || index < 0 || index > snapshot.entries.length)
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throw new Error("List index out of bounds");
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snapshot.entries.splice(index, 0, { target });
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return port.replace(snapshot.entries, expectedRevision);
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},
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async move(edgeId, index, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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const prior = snapshot.entries.findIndex((entry) => entry.edgeId === edgeId);
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if (prior < 0 || !Number.isSafeInteger(index) || index < 0 || index >= snapshot.entries.length)
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throw new Error("Unknown list entry or invalid index");
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const [entry] = snapshot.entries.splice(prior, 1);
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snapshot.entries.splice(index, 0, entry);
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return port.replace(snapshot.entries, expectedRevision);
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},
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async delete(edgeId, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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if (!snapshot.entries.some((entry) => entry.edgeId === edgeId))
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throw new Error("Unknown list entry");
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return port.replace(snapshot.entries.filter((entry) => entry.edgeId !== edgeId), expectedRevision);
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},
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});
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export const relationshipSet = (port) => ({
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read: () => port.collection(),
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async add(target, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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if (snapshot.entries.some((entry) => entry.target.equals(target)))
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return snapshot;
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return port.replace([...snapshot.entries, { target }], expectedRevision);
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},
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async delete(target, expectedRevision) {
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const snapshot = await checked(port, expectedRevision);
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return port.replace(snapshot.entries.filter((entry) => !entry.target.equals(target)), expectedRevision);
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},
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});
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