@vechain/connex-driver
Version:
Connex framework driver implementation
213 lines • 17.8 kB
JavaScript
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
import { PromInt, InterruptedError } from './promint';
import { Cache } from './cache';
import { blake2b256 } from 'thor-devkit';
import { sleep } from './common';
/** class implements Connex.Driver leaves out Vendor related methods */
export class DriverNoVendor {
constructor(net, genesis, initialHead) {
this.net = net;
this.genesis = genesis;
this.headResolvers = [];
this.int = new PromInt();
this.cache = new Cache();
// to merge concurrent identical remote requests
this.pendingRequests = {};
if (initialHead) {
this.head = initialHead;
}
else {
this.head = {
id: genesis.id,
number: genesis.number,
timestamp: genesis.timestamp,
parentID: genesis.parentID,
txsFeatures: genesis.txsFeatures,
gasLimit: genesis.gasLimit
};
}
void this.headTrackerLoop();
}
// close the driver to prevent mem leak
close() {
this.int.interrupt();
}
// implementations
pollHead() {
return this.int.wrap(new Promise(resolve => {
this.headResolvers.push(() => resolve(this.head));
}));
}
getBlock(revision) {
return this.cache.getBlock(revision, () => this.httpGet(`blocks/${revision}`));
}
getTransaction(id, allowPending) {
return this.cache.getTx(id, () => {
const query = { head: this.head.id };
if (allowPending) {
query.pending = 'true';
}
return this.httpGet(`transactions/${id}`, query);
});
}
getReceipt(id) {
return this.cache.getReceipt(id, () => this.httpGet(`transactions/${id}/receipt`, { head: this.head.id }));
}
getAccount(addr, revision) {
return this.cache.getAccount(addr, revision, () => this.httpGet(`accounts/${addr}`, { revision }));
}
getCode(addr, revision) {
return this.cache.getTied(`code-${addr}`, revision, () => this.httpGet(`accounts/${addr}/code`, { revision }));
}
getStorage(addr, key, revision) {
return this.cache.getTied(`storage-${addr}-${key}`, revision, () => this.httpGet(`accounts/${addr}/storage/${key}`, { revision }));
}
explain(arg, revision, cacheHints) {
const cacheKey = `explain-${blake2b256(JSON.stringify(arg)).toString('hex')}`;
return this.cache.getTied(cacheKey, revision, () => this.httpPost('accounts/*', arg, { revision }), cacheHints);
}
filterEventLogs(arg, cacheHints) {
const cacheKey = `event-${blake2b256(JSON.stringify(arg)).toString('hex')}`;
return this.cache.getTied(cacheKey, this.head.id, () => this.httpPost('logs/event', arg), cacheHints);
}
filterTransferLogs(arg, cacheHints) {
const cacheKey = `transfer-${blake2b256(JSON.stringify(arg)).toString('hex')}`;
return this.cache.getTied(cacheKey, this.head.id, () => this.httpPost('logs/transfer', arg), cacheHints);
}
signTx(msg, options) {
throw new Error('signer not implemented');
}
signCert(msg, options) {
throw new Error('signer not implemented');
}
//////
mergeRequest(req, ...keyParts) {
const key = JSON.stringify(keyParts);
const pending = this.pendingRequests[key];
// eslint-disable-next-line @typescript-eslint/no-misused-promises
if (pending) {
return pending;
}
return this.pendingRequests[key] = (() => __awaiter(this, void 0, void 0, function* () {
try {
return yield req();
}
finally {
delete this.pendingRequests[key];
}
}))();
}
httpGet(path, query) {
return this.mergeRequest(() => {
return this.net.http('GET', path, {
query,
validateResponseHeader: this.headerValidator
});
}, path, query || '');
}
httpPost(path, body, query) {
return this.mergeRequest(() => {
return this.net.http('POST', path, {
query,
body,
validateResponseHeader: this.headerValidator
});
}, path, query || '', body || '');
}
get headerValidator() {
return (headers) => {
const xgid = headers['x-genesis-id'];
if (xgid && xgid !== this.genesis.id) {
throw new Error(`responded 'x-genesis-id' not matched`);
}
};
}
emitNewHead() {
const resolvers = this.headResolvers;
this.headResolvers = [];
resolvers.forEach(r => r());
}
headTrackerLoop() {
return __awaiter(this, void 0, void 0, function* () {
for (;;) {
let attemptWs = false;
try {
const best = yield this.int.wrap(this.httpGet('blocks/best'));
if (best.id !== this.head.id && best.number >= this.head.number) {
this.head = {
id: best.id,
number: best.number,
timestamp: best.timestamp,
parentID: best.parentID,
txsFeatures: best.txsFeatures,
gasLimit: best.gasLimit
};
this.cache.handleNewBlock(this.head, undefined, best);
this.emitNewHead();
if (Date.now() - this.head.timestamp * 1000 < 60 * 1000) {
// nearly synced
attemptWs = true;
}
}
}
catch (err) {
if (err instanceof InterruptedError) {
break;
}
}
if (attemptWs) {
try {
yield this.trackWs();
}
catch (err) {
if (err instanceof InterruptedError) {
break;
}
}
}
try {
yield this.int.wrap(sleep(8 * 1000));
}
catch (_a) {
break;
}
}
});
}
trackWs() {
return __awaiter(this, void 0, void 0, function* () {
const wsPath = `subscriptions/beat2?pos=${this.head.parentID}`;
const wsr = this.net.openWebSocketReader(wsPath);
try {
for (;;) {
const data = yield this.int.wrap(wsr.read());
const beat = JSON.parse(data);
if (!beat.obsolete && beat.id !== this.head.id && beat.number >= this.head.number) {
this.head = {
id: beat.id,
number: beat.number,
timestamp: beat.timestamp,
parentID: beat.parentID,
txsFeatures: beat.txsFeatures,
gasLimit: beat.gasLimit
};
this.cache.handleNewBlock(this.head, { k: beat.k, bits: beat.bloom });
this.emitNewHead();
}
}
}
finally {
wsr.close();
}
});
}
}
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