@x5e/gink
Version:
an eventually consistent database
181 lines • 7.58 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.PairSet = void 0;
const Database_1 = require("./Database");
const Container_1 = require("./Container");
const utils_1 = require("./utils");
const factories_1 = require("./factories");
const builders_1 = require("./builders");
class PairSet extends Container_1.Container {
constructor(database, address) {
super(database, address, builders_1.Behavior.PAIR_SET);
}
static get(database, muid) {
database = database || Database_1.Database.recent;
if (!muid) {
muid = { timestamp: -1, medallion: -1, offset: builders_1.Behavior.PAIR_SET };
}
return new PairSet(database, muid);
}
static async create(database, meta) {
database = database || Database_1.Database.recent;
const muid = await Container_1.Container.addContainer({
behavior: builders_1.Behavior.PAIR_SET,
database,
meta,
});
return new PairSet(database, muid);
}
/**
* Includes a pair of Muids or Containers in the pair set.
* @param key a pair of either containers or Muids to include
* @param change an optional bundler to put this change into
* @returns a promise that resolves to the Muid for the inclusion
*/
async include(key, meta) {
return await this.addEntry(key, Container_1.Container.INCLUSION, meta);
}
/**
* Excludes a pair of Muids or Containers in the pair set.
* @param key a pair of either containers or Muids to include
* @param change an optional bundler to put this change into
* @returns a promise that resolves to the Muid for the exclusion
*/
async exclude(key, meta) {
return await this.addEntry(key, Container_1.Container.DELETION, meta);
}
/**
* If the pair set has a key or not.
* @param key array of 2 muids or containers
* @param asOf optional timestamp to look back to
* @returns a promise that resolves to a boolean, true if the key is included, false if not
*/
async contains(key, asOf) {
const aKey = [
key[0] instanceof Container_1.Container ? key[0].address : key[0],
key[1] instanceof Container_1.Container ? key[1].address : key[1],
];
const found = await this.database.store.getEntryByKey(this.address, aKey, asOf);
if (found && found.deletion)
return false;
return Boolean(found);
}
async reset(toTime, recurse, meta) {
const bundler = await this.database.startBundle(meta);
if (!toTime) {
// If no time is specified, we are resetting to epoch, which is just a clear
this.clear(false, { bundler });
}
else {
const union = new Set();
const entriesThen = await this.database.store.getKeyedEntries(this.address, toTime);
const entriesNow = await this.database.store.getKeyedEntries(this.address);
for (const [key, entry] of entriesThen) {
const storageKey = entry.storageKey;
union.add(storageKey);
}
for (const [key, entry] of entriesNow) {
const storageKey = entry.storageKey;
union.add(storageKey);
}
for (const key of union) {
const genericKey = (0, utils_1.fromStorageKey)(key);
const thenEntry = await this.database.store.getEntryByKey(this.address, genericKey, toTime);
const nowEntry = await this.database.store.getEntryByKey(this.address, genericKey);
(0, utils_1.ensure)(nowEntry || thenEntry, "both then and now undefined?");
if (!nowEntry) {
// This key was present then, but not now, so we need to add it back
(0, utils_1.ensure)(thenEntry, "missing then entry?");
await this.addEntry(genericKey, thenEntry.value, {
bundler,
});
}
else if (!thenEntry) {
// This key is present now, but not then, so we need to delete it
(0, utils_1.ensure)(nowEntry, "missing now entry?");
await this.addEntry(genericKey, Container_1.Container.DELETION, {
bundler,
});
}
else if (nowEntry.deletion !== thenEntry.deletion) {
if (nowEntry.deletion) {
// Present then, deleted now. Need to revive.
await this.addEntry(genericKey, Container_1.Container.INCLUSION, {
bundler,
});
}
else if (thenEntry.deletion) {
// Present now, deleted then. Need to delete.
await this.addEntry(genericKey, Container_1.Container.DELETION, {
bundler,
});
}
}
else {
(0, utils_1.ensure)(nowEntry.deletion === thenEntry.deletion, "last case should be same entry");
}
}
}
if (!meta?.bundler) {
await bundler.commit();
}
}
/**
* The number of items in the pair set.
* @param asOf optional timestamp to look back to
* @returns a promise that resolves to the number of entries
*/
async size(asOf) {
const entries = await this.database.store.getKeyedEntries(this.address, asOf);
return entries.size;
}
/**
* All of the pairs in the Pair Set as a set
* @param asOf optional timestamp to look back to
* @returns a promise that resolves to a set of pairs [Muid, Muid]
*/
async getPairs(asOf) {
const entries = await this.database.store.getKeyedEntries(this.address, asOf);
const toSet = new Set();
for (const [key, entry] of entries) {
if (!entry.deletion) {
toSet.add(entry.storageKey);
}
}
return toSet;
}
/**
* Generates a JSON representation of the data in the pair set.
* Mostly intended for demo/debug purposes.
* @param indent true to pretty print (not yet implemented)
* @param asOf optional timestamp to look back to
* @param seen (internal use only! This prevents cycles from breaking things)
* @returns a JSON string
*/
async toJson(indent = false, asOf, seen) {
//TODO(https://github.com/google/gink/issues/62): add indentation
(0, utils_1.ensure)(indent === false, "indent not implemented");
if (seen === undefined)
seen = new Set();
const mySig = (0, utils_1.muidToString)(this.address);
if (seen.has(mySig))
return "null";
seen.add(mySig);
const asSet = await this.getPairs(asOf);
let returning = "[";
let first = true;
for (const key of asSet) {
if (first) {
first = false;
}
else {
returning += ",";
}
returning += await (0, factories_1.toJson)(`[${(0, utils_1.muidToString)(key[0])}, ${(0, utils_1.muidToString)(key[1])}]`, indent === false ? false : +indent + 1, asOf, seen);
}
returning += "]";
return returning;
}
}
exports.PairSet = PairSet;
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