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import { Cardano, CardanoNode, Seconds, createSlotEpochInfoCalc } from '@cardano-sdk/core';
import { GenesisData } from '..';
import { Logger } from 'ts-log';
import { NetworkInfoResponses, WSMessage, WsProvider, isTxRelevant } from '@cardano-sdk/cardano-services-client';
import { Notification, Pool } from 'pg';
import { Server, createServer } from 'http';
import { WebSocket, WebSocketServer } from 'ws';
import { getLovelaceSupply, getProtocolParameters, getStake, transactionsByAddresses } from './requests';
import { initDB } from './db';
import { toGenesisParams } from '../NetworkInfo/DbSyncNetworkInfoProvider/mappers';
import { toSerializableObject } from '@cardano-sdk/util';
import { v4 } from 'uuid';
export { WebSocket } from 'ws';
declare module 'ws' {
interface WebSocket {
addresses: Cardano.PaymentAddress[];
clientId: string;
heartbeat: number;
logError: (error: Error, msg: string) => void;
logInfo: (msg: object | string) => void;
logDebug: (msg: object | string) => void;
sendMessage: (message: WSMessage) => void;
}
interface WebSocketServer {
clients: Set<WebSocket>;
}
}
export interface WsServerConfiguration {
/** The cache time to live in seconds. */
dbCacheTtl: number;
/** The heartbeat check interval in seconds. */
heartbeatInterval?: number;
/** The heartbeat timeout in seconds. */
heartbeatTimeout?: number;
/** The port to listen. */
port: number;
}
export interface WsServerDependencies {
/** The `CardanoNode` object. */
cardanoNode: CardanoNode;
/** The PostgreSQL Pool. */
db: Pool;
/** The `GenesisData` object */
genesisData: GenesisData;
/** The logger. */
logger: Logger;
}
// eslint-disable-next-line @typescript-eslint/no-empty-function
const noop = () => {};
interface NotificationBody {
message: WSMessage;
transactions: Cardano.HydratedTx[];
}
interface NotificationEvent {
notification: number;
transactions: Cardano.HydratedTx[];
}
/**
* Since some debug log information may require heavy computation to stringify data,
* better checking if we are interested in logging some data before actually logging it.
*/
const debugLog = process.env.LOGGER_MIN_SEVERITY === 'debug';
const toError = (error: unknown) =>
error instanceof Error ? error : new Error(`Unknown error: ${JSON.stringify(error)}`);
export class CardanoWsServer extends WsProvider {
private cardanoNode: CardanoNode;
private closeNotify = noop;
private closing = false;
private db: Pool;
private heartbeatInterval: NodeJS.Timer | undefined;
private lastReceivedNotification = 0;
private lastSentNotification = 0;
private lastSlot = Number.POSITIVE_INFINITY as Cardano.Slot;
private logger: Logger;
private networkInfo: NetworkInfoResponses;
private notifications = new Map<number, NotificationBody>();
private server: Server;
private stakeInterval: NodeJS.Timer | undefined;
private syncing = true;
private wss: WebSocketServer;
constructor(dependencies: WsServerDependencies, cfg: WsServerConfiguration) {
super();
this.cardanoNode = dependencies.cardanoNode;
this.db = dependencies.db;
this.logger = dependencies.logger;
this.networkInfo = { genesisParameters: toGenesisParams(dependencies.genesisData) } as NetworkInfoResponses;
// Create the HTTP and the WebSocket servers
this.server = this.createHttpServer();
this.wss = new WebSocketServer({ path: '/ws', server: this.server }) as WebSocketServer;
// Attach the handlers to the servers events
this.wss.on('connection', this.createOnConnection());
this.server.on('error', (error) => {
this.logger.error(error, 'Async error from HTTP server');
this.close();
});
this.wss.on('error', (error) => {
this.logger.error(error, 'Async error from WebSocket server');
this.close();
});
// Init the server
this.init(
cfg.port,
Seconds.toMilliseconds(Seconds(cfg.dbCacheTtl || 120)),
Seconds.toMilliseconds(Seconds(cfg.heartbeatInterval || 10)),
Seconds.toMilliseconds(Seconds(cfg.heartbeatTimeout || 60))
).catch((error) => {
this.logger.error(error, 'Error in init sequence');
this.close();
});
}
/** Closes the server. */
close(callback?: () => void) {
this.closing = true;
this.closeNotify();
Iif (this.heartbeatInterval) clearInterval(this.heartbeatInterval);
Iif (this.stakeInterval) clearInterval(this.stakeInterval);
this.wss.close((wsError) => {
Iif (wsError && (!(wsError instanceof Error) || wsError.message !== 'The server is not running'))
this.logger.error(wsError, 'Error while closing the WebSocket server');
this.server.close((httpError) => {
// TODO required TypeScript v5.5.4 to remove casting as any
// eslint-disable-next-line @typescript-eslint/no-explicit-any
Iif (httpError && (!('code' in httpError) || (httpError as any).code !== 'ERR_SERVER_NOT_RUNNING'))
this.logger.error(httpError, 'Error while closing the HTTP server');
Iif (callback) callback();
});
});
for (const client of this.wss.clients) client.close();
}
/** Creates a simple HTTP server which just handles the `/health` URL. Mainly used to listen the WS server. */
private createHttpServer() {
return createServer(async (req, res) => {
const { method, url } = req;
Iif (['/health', '/ready'].includes(url!)) {
const healthCheck = await this.healthCheck();
Iif (url === '/health' && healthCheck.notRecoverable) res.statusCode = 500;
Iif (url === '/ready' && !healthCheck.ok) res.statusCode = 500;
return res.end(JSON.stringify(healthCheck));
}
this.logger.info(method, url);
res.statusCode = 404;
res.end('Not found');
});
}
private createOnNotification() {
// This is the entry point for a new NOTIFY event from the DB; i.e. each time a new record is inserted in the block table
// eslint-disable-next-line sonarjs/cognitive-complexity
return (msg: Notification) =>
(async () => {
const notification = ++this.lastReceivedNotification;
const { payload } = msg;
Iif (!payload) throw new Error('Missing payload in NOTIFY');
// The payload of the NOTIFY event contain the tip in the correct format
const { blockId, ...ledgerTip } = JSON.parse(payload) as Cardano.Tip & { blockId: string };
this.networkInfo.ledgerTip = ledgerTip;
this.logger.debug(`Notification ${notification}: ${JSON.stringify(ledgerTip)}`);
const epochRollover = async () => {
Iif (ledgerTip.slot <= this.lastSlot) return { ledgerTip };
this.logger.debug(`Epoch rollover for notification ${notification}...`);
await this.onEpochRollover();
const { eraSummaries, lovelaceSupply, protocolParameters } = this.networkInfo;
Iif (debugLog)
this.logger.debug(
`Epoch rollover for notification ${notification}: ${JSON.stringify(
toSerializableObject({ eraSummaries, lovelaceSupply, protocolParameters })
)}`
);
return { eraSummaries, ledgerTip, lovelaceSupply, protocolParameters };
};
const loadTransactions = async () => {
const addressesObj: Record<Cardano.PaymentAddress, true> = {};
// Benchmarks
// https://jsbenchmark.com/#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-ICh7Li4ucmVzdWx0LCBbaXRdOiB0cnVlfSksIHt9KTtcbmNvbnN0IGFkZHJlc3NlcyA9IFtPYmplY3Qua2V5cyhhZGRyZXNzZXNNYXApXTsiLCJuYW1lIjoiRmlyc3QgcHJvcG9zYWwiLCJkZXBlbmRlbmNpZXMiOltdfSx7ImlkIjoibE5fM29CdS1rQlVUMlJ5U24wcU1tIiwiY29kZSI6ImNvbnN0IHsgd3NzIH0gPSBEQVRBO1xuXG5jb25zdCBhZGRyZXNzZXNNYXAgPSBbLi4ud3NzLmNsaWVudHNdXG4gIC5mbGF0TWFwKGl0ID0-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
for (const ws of this.wss.clients) {
const addresses = ws.addresses;
// eslint-disable-next-line space-in-parens
for (let aLen = addresses.length; aLen--; ) addressesObj[addresses[aLen]] = true;
}
const addresses = Object.keys(addressesObj) as Cardano.PaymentAddress[];
Iif (debugLog) this.logger.debug(`Transactions for notification ${notification} ${JSON.stringify(addresses)}`);
const txs = addresses.length === 0 ? [] : await transactionsByAddresses(addresses, this.db, { blockId });
Iif (debugLog) this.logger.debug(`Transactions for notification ${notification} ${JSON.stringify(txs)}`);
return txs;
};
const [networkInfo, transactions] = await Promise.all([epochRollover(), loadTransactions()]);
this.send({ networkInfo }, { notification, transactions });
})().catch((error) => {
this.logger.error(error, 'Error while handling tip notification');
// Since an error while handling tip notification may be source of data inconsistencies, better to shutdown
this.emitHealth(
error instanceof Error ? error.message || 'Unknown error' : `Unknown error ${JSON.stringify(error)}`,
{ notRecoverable: true, overwrite: true }
);
this.close();
});
}
private listenNotify() {
const { db, logger } = this;
// This is the function which listens for events throw the NOTIFY command.
// It recursively calls itself to handle reconnection.
const addListener = () => {
logger.info('Connecting to DB to listen on sdk_tip NOTIFY...');
// eslint-disable-next-line unicorn/consistent-function-scoping
const reAddListener = () => {
// eslint-disable-next-line unicorn/consistent-destructuring
Iif (!this.closing) setTimeout(addListener, 1000).unref();
};
// Ask for a DB client to the connections pool.
db.connect((err, client, done) => {
Iif (err) {
logger.error(err, 'Error while connecting to DB to listen on sdk_tip NOTIFY');
this.emitHealth(err.message, { overwrite: true });
// In case of error opening the DB client, just retry after 1".
return reAddListener();
}
logger.info('Connected to DB to listen on sdk_tip NOTIFY');
// Set the function to close the client; used here for error handling and later by server close
this.closeNotify = () => {
logger.info('Closing DB connection listening on sdk_tip NOTIFY');
this.emitHealth('closing');
// Resets itself, in case it is called more than once...
this.closeNotify = noop;
done();
};
// Attach the handlers to the DB client events
client.on('end', () => {
this.emitHealth('closed');
// Being this the client closed event handler, there is no longer need for the function to close it
this.closeNotify = noop;
// If the connection was closed because the server is being closed as well, that's all
// For any other reason the connection was closed, just retry a new connection
reAddListener();
});
client.on('error', (e) => {
logger.error(e, 'Async error from sdk_tip NOTIFY');
this.emitHealth(e.message, { overwrite: true });
this.closeNotify();
});
// eslint-disable-next-line unicorn/consistent-destructuring
client.on('notification', this.createOnNotification());
// Issue the LISTEN command to get the notification event
client.query('LISTEN sdk_tip', (e) => {
Iif (!e) return;
logger.error(e, 'Error while listening on sdk_tip NOTIFY');
this.emitHealth(e.message, { overwrite: true });
this.closeNotify();
});
});
};
addListener();
}
private async init(port: number, dbCacheTtl: number, heartbeatInterval: number, heartbeatTimeout: number) {
const { cardanoNode, db, logger, networkInfo, server, wss } = this;
const refreshStake = async () => {
const stake = await getStake(cardanoNode, db);
networkInfo.stake = stake;
this.send({ networkInfo: { stake } });
};
networkInfo.ledgerTip = await initDB(db, logger);
await Promise.all([this.onEpochRollover(), refreshStake()]);
this.stakeInterval = setInterval(
() =>
refreshStake().catch((error) => {
logger.error(error, 'Error while refreshing stake');
this.close();
}),
dbCacheTtl
);
// eslint-disable-next-line unicorn/consistent-destructuring
this.stakeInterval.unref();
this.heartbeatInterval = setInterval(() => {
const threshold = Date.now() - heartbeatTimeout;
for (const ws of wss.clients.values())
Iif (ws.heartbeat < threshold) {
ws.logInfo('Timed out, closing');
ws.close();
}
}, heartbeatInterval);
// eslint-disable-next-line unicorn/consistent-destructuring
this.heartbeatInterval.unref();
const check = async () => {
const { localNode } = await cardanoNode.healthCheck();
Iif (!localNode) throw new Error('Missing node health check response');
Iif (!localNode.ledgerTip) throw new Error('Missing "ledgerTip" in node health check response');
Iif (!localNode.networkSync) throw new Error('Missing "networkSync" in node health check response');
const projectedTip = networkInfo.ledgerTip;
const tipDiff = localNode.ledgerTip.blockNo - projectedTip.blockNo;
// Two blocks difference tolerance
Iif (tipDiff >= 2) return this.emitHealth({ localNode, ok: false, projectedTip });
// Leave untouched the status set by healthCheck in init method
Iif (localNode.ledgerTip.blockNo === 0) return;
const ok = localNode.networkSync >= 0.999;
// eslint-disable-next-line unicorn/consistent-destructuring
Iif (ok && this.syncing) this.syncing = false;
this.emitHealth({ localNode, ok, projectedTip });
};
const healthCheck = () => {
check()
.finally(() => setTimeout(healthCheck, 1000).unref())
.catch((error_) => {
const error = toError(error_);
this.emitHealth(error.message);
logger.error(error, 'While checking node health check');
});
};
// Check synchronously to be sure init is complete
await check();
// Next schedule asynchronous checks
healthCheck();
server.listen(port, () => logger.info('WebSocket server ready and listening'));
this.listenNotify();
}
private createOnConnection() {
// This is the entry point for each new WebSocket connection
return (ws: WebSocket) => {
const { logger, networkInfo, syncing } = this;
const clientId = (ws.clientId = v4());
ws.addresses = [];
// Create some wrappers for the logger
ws.logError = (error: Error, msg: string) => {
logger.error({ clientId }, msg);
logger.error(error, msg);
};
ws.logInfo = (msg: object | string) =>
logger.info(...(typeof msg === 'string' ? [{ clientId }, msg] : [{ clientId, ...msg }]));
ws.logDebug = (msg: object | string) =>
logger.debug(...(typeof msg === 'string' ? [{ clientId }, msg] : [{ clientId, ...msg }]));
ws.sendMessage = (message: WSMessage) => {
const stringMessage = JSON.stringify(toSerializableObject(message));
ws.logDebug(stringMessage);
ws.send(stringMessage);
};
const onClose = (close?: boolean) => {
Iif (close) ws.close();
ws.logInfo('Connection closed');
// eslint-disable-next-line @typescript-eslint/no-empty-function
ws.sendMessage = () => {};
};
ws.logInfo('Connected');
// If still syncing, actually do not accept connections
Iif (syncing) {
ws.sendMessage({ clientId, syncing: true });
setTimeout(() => onClose(true), 1000);
return;
}
// Attach the handlers to the WS connection events
ws.on('close', onClose);
ws.on('error', (error) => ws.logError(error, 'Async error from WebSocket connection'));
// This is the entry point for each new WebSocket message from this connection
ws.on('message', (data) => {
// First of all, refresh the heartbeat timeout
ws.heartbeat = Date.now();
// This is never expected... just in case
Iif (!(data instanceof Buffer))
return ws.logError(new Error('Not a Buffer'), `Unexpected data from WebSocket ${JSON.stringify(data)}`);
// DoS protection
Iif (data.length > 1024 * 100) {
ws.logError(new Error('Buffer too long'), 'Unexpected data length from WebSocket: closing');
return ws.close();
}
let request: WSMessage;
try {
request = JSON.parse(data.toString('utf8'));
} catch (error) {
ws.logError(error as Error, 'Error parsing message: closing');
return ws.close();
}
// Heartbeat messages do not expect a response
Iif (Object.keys(request).length === 0) return;
this.request(ws, request).catch((error) => ws.logError(error, 'Error while processing request'));
});
// Actually set the timeout for the first time
ws.heartbeat = Date.now();
ws.sendMessage({ clientId, networkInfo });
};
}
private async onEpochRollover() {
const { cardanoNode, db, networkInfo } = this;
// Immediately calculate last slot for this epoch (even if with old era summaries) to avoid the event being called twice
Iif (networkInfo.eraSummaries)
this.lastSlot = createSlotEpochInfoCalc(networkInfo.eraSummaries)(networkInfo.ledgerTip.slot).lastSlot.slot;
[networkInfo.eraSummaries, networkInfo.lovelaceSupply, networkInfo.protocolParameters] = await Promise.all([
cardanoNode.eraSummaries(),
getLovelaceSupply(db, networkInfo.genesisParameters.maxLovelaceSupply),
getProtocolParameters(db)
]);
// Calculate last slot for this epoch with new era summaries
this.lastSlot = createSlotEpochInfoCalc(networkInfo.eraSummaries)(networkInfo.ledgerTip.slot).lastSlot.slot;
}
private async request(ws: WebSocket, request: WSMessage) {
const { txsByAddresses, requestId } = request;
try {
ws.logInfo(request);
Iif (txsByAddresses) {
const action = (transactions?: Cardano.HydratedTx[], utxos?: Cardano.HydratedTx[]) => {
Iif (transactions) ws.logInfo(`Sending ${transactions.length} transactions for request ${requestId}`);
Iif (utxos) ws.logInfo(`Sending ${utxos.length} partial transactions for request ${requestId}`);
ws.sendMessage({ transactions, utxos });
};
const { addresses, lower } = txsByAddresses;
ws.addresses.push(...addresses);
await transactionsByAddresses(addresses, this.db, { action, lower });
}
Iif (requestId) {
ws.logInfo(`Responding to request ${requestId}`);
ws.sendMessage({ responseTo: requestId });
}
} catch (error_) {
const error = toError(error_);
ws.logError(error, 'While performing request');
Iif (requestId) ws.sendMessage({ error, responseTo: requestId });
}
}
private send(message: WSMessage, notificationEvent?: NotificationEvent) {
// If the message is not bound to a tip notification, just send it
Iif (!notificationEvent) return this.sendString(JSON.stringify(toSerializableObject(message)));
const { notification, transactions } = notificationEvent;
Iif (debugLog) this.logger.debug(`Scheduling notification: ${JSON.stringify(toSerializableObject(message))}`);
// Ensure messages from notifications are propagated in the same order as the notification was received
this.notifications.set(notification, { message, transactions });
while (this.notifications.has(this.lastSentNotification + 1)) {
this.sendNotification(this.notifications.get(++this.lastSentNotification)!);
this.notifications.delete(this.lastSentNotification);
}
}
private sendNotification(notification: NotificationBody) {
const { message, transactions } = notification;
const stringMessage = JSON.stringify(toSerializableObject(message));
for (const ws of this.wss.clients) {
const txs = transactions.filter((tx) => isTxRelevant(tx, ws.addresses));
Iif (debugLog)
ws.logDebug(
`Sending notification: ${
txs.length === 0 ? stringMessage : JSON.stringify(toSerializableObject({ ...message, transactions: txs }))
}`
);
txs.length === 0 ? ws.send(stringMessage) : ws.sendMessage({ ...message, transactions: txs });
}
}
private sendString(message: string) {
for (const ws of this.wss.clients.values()) ws.send(message);
}
}
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