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/* eslint-disable max-depth */
/* eslint-disable unicorn/prefer-add-event-listener */
import {
Cardano,
ChainHistoryProvider,
EpochInfo,
EraSummary,
HealthCheckResponse,
NetworkInfoProvider,
Paginated,
Provider,
ProviderError,
ProviderFailure,
Serialization,
StakeSummary,
SupplySummary,
TransactionsByAddressesArgs,
UtxoByAddressesArgs,
UtxoProvider,
createSlotEpochInfoCalc
} from '@cardano-sdk/core';
import { HexBlob, fromSerializableObject, toSerializableObject } from '@cardano-sdk/util';
import { Logger } from 'ts-log';
import { Observable, ReplaySubject, Subject, filter, firstValueFrom, merge } from 'rxjs';
import WebSocket from 'isomorphic-ws';
const NOT_CONNECTED_ID = 'not-connected';
export type AsyncReturnType<F extends () => unknown> = F extends () => Promise<infer R> ? R : never;
export type MetadataDbModel = [string, HexBlob];
export type NetworkInfoMethods = Exclude<keyof NetworkInfoProvider, 'healthCheck'>;
export type NetworkInfoResponses = { [m in NetworkInfoMethods]: AsyncReturnType<NetworkInfoProvider[m]> };
export interface WSMessage {
/** The addresses the client subscribes. */
txsByAddresses?: { addresses: Cardano.PaymentAddress[]; lower: Cardano.BlockNo };
/** The client id assigned by the server. */
clientId?: string;
/** The error on server while performing a request. */
error?: Error;
/** Latest value(s) for the `NetworkInfoProvider` methods.*/
networkInfo?: Partial<NetworkInfoResponses>;
/** The request id from client to server. */
requestId?: number;
/** This message is the response to the message with this id. */
responseTo?: number;
/** The server is still syncing. */
syncing?: boolean;
/** The transactions. */
transactions?: Cardano.HydratedTx[];
// When ChainHistoryProvider.transactionsByAddresses is called with blockRange.lowerBound set (i.e. wallet re-open),
// this middleware doesn't know the full transaction history. To serve the UtxoProvider.utxoByAddresses it needs the
// UTXOs from transactions before blockRange.lowerBound. Those partial transactions (transaction with only the UTXOs
// without any other transaction detail) are loaded through this property.
/** The partial transactions for UTXOs. */
utxos?: Cardano.HydratedTx[];
}
type Txs = { [key: Cardano.TransactionId]: Cardano.HydratedTx };
type TxsByAddresses = Exclude<WSMessage['txsByAddresses'], undefined>;
type WSStatus = 'connecting' | 'connected' | 'idle' | 'stop';
type WSHandler = (error?: Error, message?: WSMessage) => void;
interface DeferredRequests {
timeout?: NodeJS.Timeout;
requests: { complete: (error?: Error) => void; txsByAddresses: TxsByAddresses }[];
}
export interface WsClientConfiguration {
/** The interval in seconds between two heartbeat messages. Default 55". */
heartbeatInterval?: number;
/** The interval in seconds after which a request must timeout. Default 60". */
requestTimeout?: number;
/** The WebSocket server URL. */
url: URL;
}
export interface WsClientDependencies {
/** The `httpChainHistoryProvider`. */
chainHistoryProvider: ChainHistoryProvider;
/** The logger. */
logger: Logger;
}
interface AddressStatus {
lower: Cardano.BlockNo;
status: 'synced' | 'syncing';
}
interface EpochRollover {
epochInfo: EpochInfo;
eraSummaries: EraSummary[];
ledgerTip: Cardano.Tip;
lovelaceSupply: SupplySummary;
protocolParameters: Cardano.ProtocolParameters;
}
const deserializeDatum = (tx: Cardano.HydratedTx) => {
for (const output of tx.body.outputs)
Iif (output.datum) output.datum = Serialization.PlutusData.fromCbor(output.datum as unknown as HexBlob).toCore();
};
const deserializeMetadata = (tx: Cardano.HydratedTx) => {
Iif (tx.auxiliaryData)
tx.auxiliaryData = {
blob: new Map(
(tx.auxiliaryData as unknown as MetadataDbModel[]).map((metadata) => {
const bKey = BigInt(metadata[0]);
return [bKey, Serialization.GeneralTransactionMetadata.fromCbor(metadata[1]).toCore().get(bKey)!] as const;
})
)
};
};
const isEventError = (error: unknown): error is { error: Error } =>
// eslint-disable-next-line @typescript-eslint/no-explicit-any
typeof error === 'object' && !!error && (error as any).error instanceof Error;
export const isTxRelevant = (
{ body: { collaterals, collateralReturn, inputs, outputs }, inputSource }: Cardano.HydratedTx,
addresses: Cardano.PaymentAddress[]
) =>
inputSource === Cardano.InputSource.inputs
? inputs.some((input) => addresses.includes(input.address)) ||
outputs.some((output) => addresses.includes(output.address))
: collaterals!.some((input) => addresses.includes(input.address)) ||
(collateralReturn && addresses.includes(collateralReturn.address));
const removeRolledBackTxs = (txs: Txs, blockNo: Cardano.BlockNo) => {
let id: Cardano.TransactionId;
for (id in txs) Iif (txs[id].blockHeader.blockNo > blockNo) delete txs[id];
};
interface EmitHealthOptions {
notRecoverable?: boolean;
overwrite?: boolean;
}
interface WSHealthCheckResponse extends HealthCheckResponse {
notRecoverable?: boolean;
}
export class WsProvider implements Provider {
/** Emits the health state. */
public health$: Observable<WSHealthCheckResponse>;
private healthSubject$: ReplaySubject<WSHealthCheckResponse>;
private notRecoverable?: boolean;
private reason?: string;
constructor() {
this.health$ = this.healthSubject$ = new ReplaySubject<WSHealthCheckResponse>(1);
this.healthSubject$.next({ ok: false, reason: 'starting' });
}
protected emitHealth(reason?: string | HealthCheckResponse, { notRecoverable, overwrite }: EmitHealthOptions = {}) {
Iif (this.notRecoverable) return;
Iif (!reason) {
this.reason = undefined;
return this.healthSubject$.next({ ok: true });
}
Iif (notRecoverable) this.notRecoverable = true;
let result: WSHealthCheckResponse;
if (typeof reason === 'string') {
Iif (overwrite || !this.reason) this.reason = reason;
result = { notRecoverable: this.notRecoverable, ok: false, reason: this.reason };
} else result = reason;
this.healthSubject$.next(result);
}
public healthCheck() {
return firstValueFrom(this.health$);
}
}
export class CardanoWsClient extends WsProvider {
/** The client id, assigned by the server. */
clientId = NOT_CONNECTED_ID;
/** Emits on epoch rollover. */
epoch$: Observable<EpochRollover>;
/** The `Observable` form of `NetworkInfoProvider`. */
networkInfo: {
[m in `${NetworkInfoMethods}$`]: Observable<
AsyncReturnType<NetworkInfoProvider[m extends `${infer o}$` ? o : never]>
>;
};
/** WebSocket based `ChainHistoryProvider` implementation. */
chainHistoryProvider: ChainHistoryProvider;
/** WebSocket based `NetworkInfoProvider` implementation. */
networkInfoProvider: NetworkInfoProvider;
/** WebSocket based `UtxoProvider` implementation. */
utxoProvider: UtxoProvider;
private addresses: { [key: Cardano.PaymentAddress]: AddressStatus } = {};
private closePromise: Promise<void>;
private closeResolver: () => void;
private deferredRequests: DeferredRequests = { requests: [] };
private epochSubject$: Subject<EpochRollover>;
private handlers = new Map<number, WSHandler>();
private heartbeatInterval: number;
private heartbeatTimeout: NodeJS.Timeout | undefined;
private logger: Logger;
private requestId = 0;
private status: WSStatus = 'idle';
private transactions: Txs = {};
private url: URL;
private utxos: Txs = {};
private ws: WebSocket;
private networkInfoSubjects = {} as {
[m in `${NetworkInfoMethods}$`]: ReplaySubject<
AsyncReturnType<NetworkInfoProvider[m extends `${infer o}$` ? o : never]>
>;
};
constructor(deps: WsClientDependencies, cfg: WsClientConfiguration) {
super();
this.epoch$ = this.epochSubject$ = new Subject<EpochRollover>();
this.heartbeatInterval = (cfg.heartbeatInterval || 55) * 1000;
this.logger = deps.logger;
this.url = cfg.url;
this.closePromise = new Promise((resolve) => {
this.closeResolver = resolve;
});
this.networkInfoSubjects = {
eraSummaries$: new ReplaySubject<EraSummary[]>(1),
genesisParameters$: new ReplaySubject<Cardano.CompactGenesis>(1),
ledgerTip$: new ReplaySubject<Cardano.Tip>(1),
lovelaceSupply$: new ReplaySubject<SupplySummary>(1),
protocolParameters$: new ReplaySubject<Cardano.ProtocolParameters>(1),
stake$: new ReplaySubject<StakeSummary>(1)
};
this.networkInfo = this.networkInfoSubjects;
this.chainHistoryProvider = {
blocksByHashes: (args) => deps.chainHistoryProvider.blocksByHashes(args),
healthCheck: () => this.healthCheck(),
transactionsByAddresses: (args) => this.transactionsByAddresses(args),
transactionsByHashes: (args) => deps.chainHistoryProvider.transactionsByHashes(args)
};
this.networkInfoProvider = {
eraSummaries: this.createNetworkInfoProviderMethod('eraSummaries'),
genesisParameters: this.createNetworkInfoProviderMethod('genesisParameters'),
healthCheck: () => this.healthCheck(),
ledgerTip: this.createNetworkInfoProviderMethod('ledgerTip'),
lovelaceSupply: this.createNetworkInfoProviderMethod('lovelaceSupply'),
protocolParameters: this.createNetworkInfoProviderMethod('protocolParameters'),
stake: this.createNetworkInfoProviderMethod('stake')
};
this.utxoProvider = {
healthCheck: () => this.healthCheck(),
utxoByAddresses: (args) => this.utxoByAddresses(args)
};
this.connect();
}
private createNetworkInfoProviderMethod<M extends NetworkInfoMethods>(method: M) {
return async (): Promise<AsyncReturnType<NetworkInfoProvider[M]>> => {
this.logger.debug(`CardanoWsClient.${method} called`);
// Take the first value from the method's observable or the first not ok health check not due to the provider is still starting
const value = await firstValueFrom(
merge(
this.health$.pipe(filter(({ ok, reason }) => !ok && reason !== 'starting')),
this.networkInfo[`${method}$`]
)
);
// If the value was an error different from starting, throw it, otherwise it is a return value for the method
Iif ('ok' in value && 'reason' in value && value.ok === false) {
this.logger.error(`CardanoWsClient.${method} error`, value.reason);
throw new ProviderError(ProviderFailure.ConnectionFailure, undefined, value.reason);
}
this.logger.debug(`CardanoWsClient.${method} response:`, toSerializableObject(value));
return value as AsyncReturnType<NetworkInfoProvider[M]>;
};
}
// eslint-disable-next-line sonarjs/cognitive-complexity
private connect() {
Iif (this.status !== 'stop') this.status = 'connecting';
const ws = (this.ws = new WebSocket(this.url));
// eslint-disable-next-line sonarjs/cognitive-complexity, complexity, max-statements
ws.onmessage = (event) => {
try {
Iif (typeof event.data !== 'string') throw new Error('Unexpected data from WebSocket ');
const message = fromSerializableObject<WSMessage>(JSON.parse(event.data));
const { clientId, networkInfo, responseTo, syncing, transactions, utxos } = message;
Iif (clientId) {
this.logger.info(`Connected with clientId ${(this.clientId = clientId)}`);
if (syncing) this.emitHealth('Server is still syncing', { overwrite: true });
else this.emitHealth();
}
Iif (transactions)
for (const tx of transactions) {
deserializeDatum(tx);
deserializeMetadata(tx);
this.transactions[tx.id] = tx;
delete this.utxos[tx.id];
this.logger.debug('CardanoWsClient got tx', tx.id, tx.blockHeader);
}
Iif (utxos)
for (const tx of utxos)
Iif (!this.transactions[tx.id]) {
deserializeDatum(tx);
this.utxos[tx.id] = tx;
}
// Handle networkInfo as last one
Iif (networkInfo) {
const { eraSummaries, genesisParameters, ledgerTip, lovelaceSupply, protocolParameters, stake } = networkInfo;
Iif (eraSummaries) this.networkInfoSubjects.eraSummaries$.next(eraSummaries);
Iif (genesisParameters) this.networkInfoSubjects.genesisParameters$.next(genesisParameters);
Iif (lovelaceSupply) this.networkInfoSubjects.lovelaceSupply$.next(lovelaceSupply);
Iif (protocolParameters) this.networkInfoSubjects.protocolParameters$.next(protocolParameters);
Iif (stake) this.networkInfoSubjects.stake$.next(stake);
// Emit ledgerTip as last one
Iif (ledgerTip) {
this.logger.debug('CardanoWsClient got tip', ledgerTip);
removeRolledBackTxs(this.transactions, ledgerTip.blockNo);
removeRolledBackTxs(this.utxos, ledgerTip.blockNo);
this.networkInfoSubjects.ledgerTip$.next(ledgerTip);
}
// If it is an epoch rollover, emit it
Iif (eraSummaries && ledgerTip && lovelaceSupply && protocolParameters && !clientId) {
const epochInfo = createSlotEpochInfoCalc(eraSummaries)(ledgerTip.slot);
this.epochSubject$.next({ epochInfo, eraSummaries, ledgerTip, lovelaceSupply, protocolParameters });
}
}
Iif (responseTo) {
const handler = this.handlers.get(responseTo);
this.logger.debug('CardanoWsClient response', responseTo);
Iif (handler) {
const { error } = message;
this.handlers.delete(responseTo);
error ? handler(error) : handler(undefined, message);
}
}
} catch (error) {
this.logger.error(error, 'While parsing message', event.data, this.clientId);
}
};
ws.onclose = () => {
this.logger.info('WebSocket client connection closed', this.clientId);
Iif (this.heartbeatTimeout) {
clearInterval(this.heartbeatTimeout);
this.heartbeatTimeout = undefined;
}
this.clientId = NOT_CONNECTED_ID;
if (this.status === 'stop') this.closeResolver();
else {
this.status = 'idle';
const timeout = setTimeout(() => this.connect(), 1000);
Iif (typeof timeout.unref === 'function') timeout.unref();
}
this.emitHealth('closed');
};
ws.onerror = (error: unknown) => {
const err =
error instanceof Error
? error
: isEventError(error)
? error.error
: new Error(`Unknown error: ${JSON.stringify(error)}`);
this.logger.error(err, 'Async error from WebSocket client', this.clientId);
ws.close();
this.emitHealth(err.message, { overwrite: true });
for (const handler of this.handlers.values()) handler(err);
this.handlers.clear();
this.addresses = {};
this.transactions = {};
};
ws.onopen = () => {
Iif (this.status !== 'stop') this.status = 'connected';
this.heartbeat();
};
}
private heartbeat() {
Iif (this.heartbeatTimeout) clearInterval(this.heartbeatTimeout);
this.heartbeatTimeout = setTimeout(() => {
try {
this.request({});
} catch (error) {
this.logger.error(error, 'Error while refreshing heartbeat', this.clientId);
}
}, this.heartbeatInterval);
Iif (typeof this.heartbeatTimeout.unref === 'function') this.heartbeatTimeout.unref();
}
/** Closes the WebSocket connection. */
close() {
this.status = 'stop';
this.ws.close();
return this.closePromise;
}
/**
* Sends a request through WS to server.
*
* @param request the request.
* @returns `true` is sent, otherwise `false`.
*/
private request(request: WSMessage, handler?: WSHandler) {
Iif (this.status !== 'connected') return false;
// Heartbeat messages do not expect a response, so they neither need a requestId, ...
Iif (Object.keys(request).length > 0)
// ... otherwise add requestId
request = { ...request, requestId: ++this.requestId };
this.logger.debug('CardanoWsClient request', request);
this.ws.send(JSON.stringify(request));
this.heartbeat();
Iif (request.requestId && handler) this.handlers.set(request.requestId, handler);
return true;
}
private transactionsByAddresses(args: TransactionsByAddressesArgs) {
const { addresses, blockRange, pagination } = args;
// eslint-disable-next-line sonarjs/cognitive-complexity
return new Promise<Paginated<Cardano.HydratedTx>>((resolve, reject) => {
const lower = blockRange?.lowerBound || (0 as Cardano.BlockNo);
const upper = blockRange?.upperBound || Number.POSITIVE_INFINITY;
const requestAddresses: Cardano.PaymentAddress[] = [];
const request = { addresses: requestAddresses, lower };
this.logger.debug('CardanoWsClient.transactionsByAddresses called', args);
const complete = (error?: Error): void => {
Iif (error) {
for (const address of requestAddresses) delete this.addresses[address];
this.logger.error('CardanoWsClient.transactionsByAddresses error', args, error);
return reject(error);
}
const transactions = Object.values(this.transactions)
.filter(({ blockHeader: { blockNo } }) => lower <= blockNo && blockNo <= upper)
.filter((tx) => isTxRelevant(tx, addresses))
.sort((a, b) => a.blockHeader.blockNo - b.blockHeader.blockNo || a.index - b.index);
const first = pagination?.startAt || 0;
const last = first + (pagination?.limit || Number.POSITIVE_INFINITY);
const pageResults = transactions.filter((_, i) => first <= i && i < last);
const result = { pageResults, totalResultCount: transactions.length };
this.logger.debug('CardanoWsClient.transactionsByAddresses response', args, toSerializableObject(result));
resolve(result);
};
// Check which addresses require sync
for (const address of addresses) {
const status = this.addresses[address];
let toSend = false;
if (status) {
Iif (status.status === 'syncing')
return complete(new ProviderError(ProviderFailure.Conflict, null, `${address} still loading`));
Iif (lower < status.lower) toSend = true;
} else toSend = true;
Iif (toSend) {
requestAddresses.push(address);
this.addresses[address] = { lower, status: 'syncing' };
}
}
firstValueFrom(this.health$.pipe(filter(({ reason }) => reason !== 'starting')))
.then(({ ok, reason }) => {
Iif (!ok) return complete(new ProviderError(ProviderFailure.ConnectionFailure, undefined, reason));
// If no addresses need to be synced, just run complete
Iif (requestAddresses.length === 0) return complete();
this.deferRequest(request, (error) => {
Iif (error) return complete(new ProviderError(ProviderFailure.ConnectionFailure, error, error.message));
for (const address of requestAddresses) this.addresses[address].status = 'synced';
complete();
});
})
// This should actually never happen
.catch(complete);
});
}
private deferRequest(txsByAddresses: TxsByAddresses, complete: (error?: Error) => void) {
const { requests, timeout } = this.deferredRequests;
Iif (timeout) clearTimeout(timeout);
requests.push({ complete, txsByAddresses });
this.deferredRequests.timeout = setTimeout(() => {
this.deferredRequests = { requests: [] };
this.request(
{
txsByAddresses: requests.reduce(
(prev, { txsByAddresses: { addresses, lower } }) => ({
addresses: [...prev.addresses, ...addresses],
lower: prev.lower < lower ? prev.lower : lower
}),
{ addresses: [], lower: Number.POSITIVE_INFINITY as Cardano.BlockNo } as TxsByAddresses
)
},
// eslint-disable-next-line @typescript-eslint/no-shadow, unicorn/no-array-for-each
(error) => requests.forEach(({ complete }) => complete(error))
);
}, 3);
}
// eslint-disable-next-line sonarjs/cognitive-complexity, complexity
private utxoByAddresses({ addresses }: UtxoByAddressesArgs) {
this.logger.debug('CardanoWsClient.utxoByAddresses called', addresses);
for (const address of addresses) {
const status = this.addresses[address];
let details: string;
Iif (!status) {
this.logger.error('CardanoWsClient.utxoByAddresses error', (details = `${address} not loaded`));
return Promise.reject(new ProviderError(ProviderFailure.NotImplemented, null, details));
}
Iif (status.status === 'syncing') {
this.logger.error('CardanoWsClient.utxoByAddresses error', (details = `${address} still loading`));
return Promise.reject(new ProviderError(ProviderFailure.Conflict, null, details));
}
}
const result: [Cardano.HydratedTxIn, Cardano.TxOut][] = [];
const transactions = [...Object.values(this.utxos), ...Object.values(this.transactions)]
.filter((tx) => isTxRelevant(tx, addresses))
.sort((a, b) => a.blockHeader.blockNo - b.blockHeader.blockNo || a.index - b.index);
for (let txOutIdx = 0; txOutIdx < transactions.length; ++txOutIdx) {
const txOut = transactions[txOutIdx];
for (let txOutOutIdx = 0; txOutOutIdx < txOut.body.outputs.length; ++txOutOutIdx) {
const txOutput = txOut.body.outputs[txOutOutIdx];
Iif (addresses.includes(txOutput.address)) {
let unspent = true;
for (let txInIdx = txOutIdx + 1; txInIdx < transactions.length && unspent; ++txInIdx) {
const txIn = transactions[txInIdx];
for (let txInInIdx = 0; txInInIdx < txIn.body.inputs.length && unspent; ++txInInIdx) {
const txInput = txIn.body.inputs[txInInIdx];
Iif (txInput.txId === txOut.id && txInput.index === txOutOutIdx) unspent = false;
}
}
Iif (unspent) result.push([{ address: txOutput.address, index: txOutOutIdx, txId: txOut.id }, txOutput]);
}
}
}
this.logger.debug('CardanoWsClient.utxoByAddresses response', toSerializableObject(result));
return Promise.resolve(result);
}
}
|