@lifi/rpc-wrapper
Version:
LI.FI rpc-wrapper
65 lines (64 loc) • 2.71 kB
JavaScript
;
var __createBinding = (this && this.__createBinding) || (Object.create ? (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
var desc = Object.getOwnPropertyDescriptor(m, k);
if (!desc || ("get" in desc ? !m.__esModule : desc.writable || desc.configurable)) {
desc = { enumerable: true, get: function() { return m[k]; } };
}
Object.defineProperty(o, k2, desc);
}) : (function(o, m, k, k2) {
if (k2 === undefined) k2 = k;
o[k2] = m[k];
}));
var __setModuleDefault = (this && this.__setModuleDefault) || (Object.create ? (function(o, v) {
Object.defineProperty(o, "default", { enumerable: true, value: v });
}) : function(o, v) {
o["default"] = v;
});
var __importStar = (this && this.__importStar) || function (mod) {
if (mod && mod.__esModule) return mod;
var result = {};
if (mod != null) for (var k in mod) if (k !== "default" && Object.prototype.hasOwnProperty.call(mod, k)) __createBinding(result, mod, k);
__setModuleDefault(result, mod);
return result;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.RPCProviderCache = void 0;
const providers = __importStar(require("@ethersproject/providers"));
class RPCProviderCache {
constructor(cacheTTL, pollingInterval) {
this.cacheTTL = 60 * 60 * 24 * 1000; // ms, defaults to a day
this.pollingInterval = 8000; // number of ms between polling getBlockNumbers
this.providerCache = {};
if (cacheTTL)
this.cacheTTL = cacheTTL;
if (pollingInterval)
this.pollingInterval = pollingInterval;
}
/**
* getProvider is a wrapper around getting a provider. It's mainly repsonsible for
* writing and reading from the providerCache. This reduces the setup time for each provider.
* @param providerConfig<string> - the configuration, currently a string
* @returns a StaticJsonRpcProvider
*/
getProvider(providerConfig) {
// create hash of providerConfig
const hash = providerConfig;
const providerCache = this.providerCache[hash];
const timestampMs = Date.now();
if (providerCache && providerCache.expiresAt > timestampMs) {
return providerCache.provider;
}
else {
const provider = new providers.StaticJsonRpcProvider(providerConfig);
provider._pollingInterval = this.pollingInterval;
const providerCacheObject = {
provider,
expiresAt: timestampMs + this.cacheTTL,
};
this.providerCache[hash] = providerCacheObject;
return provider;
}
}
}
exports.RPCProviderCache = RPCProviderCache;