@dwn-protocol/id-sdk
Version:
SDK for accessing the features and capabilities
63 lines • 2.32 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.DidResolverCacheLevel = void 0;
const ms_1 = __importDefault(require("ms"));
const level_1 = require("level");
/**
* Naive level-based cache for did resolution results. It just so happens that level aggressively keeps as much as it
* can in memory when possible while also writing to the filesystem (in node runtime) and indexedDB (in browser runtime).
* the persistent aspect is especially useful across page refreshes.
*/
class DidResolverCacheLevel {
constructor(options = {}) {
let { location, ttl } = options;
location !== null && location !== void 0 ? location : (location = DidResolverCacheLevel.defaultOptions.location);
ttl !== null && ttl !== void 0 ? ttl : (ttl = DidResolverCacheLevel.defaultOptions.ttl);
this.cache = new level_1.Level(location);
this.ttl = (0, ms_1.default)(ttl);
}
async get(did) {
try {
const str = await this.cache.get(did);
const cacheWrapper = JSON.parse(str);
if (Date.now() >= cacheWrapper.ttlMillis) {
// defer deletion to be called in the next tick of the js event loop
this.cache.nextTick(() => this.cache.del(did));
return;
}
else {
return cacheWrapper.value;
}
}
catch (error) {
// Don't throw when a key wasn't found.
if (error.code === 'LEVEL_NOT_FOUND') {
return;
}
throw error;
}
}
set(did, value) {
const cacheWrapper = { ttlMillis: Date.now() + this.ttl, value };
const str = JSON.stringify(cacheWrapper);
return this.cache.put(did, str);
}
delete(did) {
return this.cache.del(did);
}
clear() {
return this.cache.clear();
}
close() {
return this.cache.close();
}
}
exports.DidResolverCacheLevel = DidResolverCacheLevel;
DidResolverCacheLevel.defaultOptions = {
location: 'data/AGENT/DID_RESOLVERCACHE',
ttl: '15m'
};
//# sourceMappingURL=resolver-cache-level.js.map