@varasto/cache-storage
Version:
Varasto storage implementation that acts as cache for another storage
177 lines (176 loc) • 8.21 kB
JavaScript
;
var __await = (this && this.__await) || function (v) { return this instanceof __await ? (this.v = v, this) : new __await(v); }
var __asyncValues = (this && this.__asyncValues) || function (o) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var m = o[Symbol.asyncIterator], i;
return m ? m.call(o) : (o = typeof __values === "function" ? __values(o) : o[Symbol.iterator](), i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i);
function verb(n) { i[n] = o[n] && function (v) { return new Promise(function (resolve, reject) { v = o[n](v), settle(resolve, reject, v.done, v.value); }); }; }
function settle(resolve, reject, d, v) { Promise.resolve(v).then(function(v) { resolve({ value: v, done: d }); }, reject); }
};
var __asyncGenerator = (this && this.__asyncGenerator) || function (thisArg, _arguments, generator) {
if (!Symbol.asyncIterator) throw new TypeError("Symbol.asyncIterator is not defined.");
var g = generator.apply(thisArg, _arguments || []), i, q = [];
return i = {}, verb("next"), verb("throw"), verb("return"), i[Symbol.asyncIterator] = function () { return this; }, i;
function verb(n) { if (g[n]) i[n] = function (v) { return new Promise(function (a, b) { q.push([n, v, a, b]) > 1 || resume(n, v); }); }; }
function resume(n, v) { try { step(g[n](v)); } catch (e) { settle(q[0][3], e); } }
function step(r) { r.value instanceof __await ? Promise.resolve(r.value.v).then(fulfill, reject) : settle(q[0][2], r); }
function fulfill(value) { resume("next", value); }
function reject(value) { resume("throw", value); }
function settle(f, v) { if (f(v), q.shift(), q.length) resume(q[0][0], q[0][1]); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.createCacheStorage = void 0;
const storage_1 = require("@varasto/storage");
const cache_1 = require("./cache");
/**
* Constructs storage that acts as an cache for another storage.
*
* @param storage Storage to create cache for.
* @param ttl Lifespan in milliseconds for cached entries. If omitted, entries
* will be cached indefinitely.
*/
const createCacheStorage = (storage, ttl) => {
const keyCache = new cache_1.Cache(ttl);
const valueCache = new cache_1.Cache(ttl);
const entryCache = new cache_1.Cache(ttl);
const namespaceCache = new cache_1.NamespaceCache(ttl);
return new (class extends storage_1.Storage {
keys(namespace) {
return __asyncGenerator(this, arguments, function* keys_1() {
var _a, e_1, _b, _c;
let keys = keyCache.get(namespace);
if (keys != null) {
for (const key of keys) {
yield yield __await(key);
}
}
else {
keys = [];
try {
for (var _d = true, _e = __asyncValues(storage.keys(namespace)), _f; _f = yield __await(_e.next()), _a = _f.done, !_a; _d = true) {
_c = _f.value;
_d = false;
const key = _c;
keys.push(key);
yield yield __await(key);
}
}
catch (e_1_1) { e_1 = { error: e_1_1 }; }
finally {
try {
if (!_d && !_a && (_b = _e.return)) yield __await(_b.call(_e));
}
finally { if (e_1) throw e_1.error; }
}
keyCache.set(namespace, keys);
}
});
}
values(namespace) {
return __asyncGenerator(this, arguments, function* values_1() {
var _a, e_2, _b, _c;
let values = valueCache.get(namespace);
if (values != null) {
for (const value of values) {
yield yield __await(value);
}
}
else {
values = [];
try {
for (var _d = true, _e = __asyncValues(storage.values(namespace)), _f; _f = yield __await(_e.next()), _a = _f.done, !_a; _d = true) {
_c = _f.value;
_d = false;
const value = _c;
values.push(value);
yield yield __await(value);
}
}
catch (e_2_1) { e_2 = { error: e_2_1 }; }
finally {
try {
if (!_d && !_a && (_b = _e.return)) yield __await(_b.call(_e));
}
finally { if (e_2) throw e_2.error; }
}
valueCache.set(namespace, values);
}
});
}
entries(namespace) {
return __asyncGenerator(this, arguments, function* entries_1() {
var _a, e_3, _b, _c;
let entries = entryCache.get(namespace);
if (entries != null) {
for (const entry of entries) {
yield yield __await(entry);
}
}
else {
entries = [];
try {
for (var _d = true, _e = __asyncValues(storage.entries(namespace)), _f; _f = yield __await(_e.next()), _a = _f.done, !_a; _d = true) {
_c = _f.value;
_d = false;
const entry = _c;
entries.push(entry);
yield yield __await(entry);
}
}
catch (e_3_1) { e_3 = { error: e_3_1 }; }
finally {
try {
if (!_d && !_a && (_b = _e.return)) yield __await(_b.call(_e));
}
finally { if (e_3) throw e_3.error; }
}
entryCache.set(namespace, entries);
}
});
}
has(namespace, key) {
const cachedValue = namespaceCache.get(namespace, key);
if (cachedValue != null) {
return Promise.resolve(true);
}
return storage.has(namespace, key);
}
get(namespace, key) {
const cachedValue = namespaceCache.get(namespace, key);
if (cachedValue != null) {
return Promise.resolve(cachedValue);
}
return storage.get(namespace, key).then((value) => {
if (value != null) {
namespaceCache.set(namespace, key, value);
}
return Promise.resolve(value);
});
}
set(namespace, key, value) {
return storage.set(namespace, key, value).then(() => {
keyCache.delete(namespace);
valueCache.delete(namespace);
entryCache.delete(namespace);
namespaceCache.set(namespace, key, value);
return Promise.resolve();
});
}
update(namespace, key, value) {
return storage.update(namespace, key, value).then((result) => {
valueCache.delete(namespace);
entryCache.delete(namespace);
namespaceCache.set(namespace, key, result);
return Promise.resolve(result);
});
}
delete(namespace, key) {
keyCache.delete(namespace);
valueCache.delete(namespace);
entryCache.delete(namespace);
namespaceCache.delete(namespace, key);
return storage.delete(namespace, key);
}
})();
};
exports.createCacheStorage = createCacheStorage;