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import { Cardano, Serialization, UtxoByAddressesArgs, UtxoProvider, sortUtxoByTxIn } from '@cardano-sdk/core';
import { Logger } from 'ts-log';
import { createPaymentCredentialFilter, extractCredentials, minimizeCredentialSet } from '../credentialUtils';
import uniqBy from 'lodash/uniqBy.js';
import type { Cache } from '@cardano-sdk/util';
import type { Responses } from '@blockfrost/blockfrost-js';
interface BlockfrostUtxoProviderOptions {
queryUtxosByCredentials?: boolean;
}
interface BlockfrostUtxoProviderDependencies {
client: BlockfrostClient;
cache: Cache<Cardano.Tx>;
logger: Logger;
}
export class BlockfrostUtxoProvider extends BlockfrostProvider implements UtxoProvider {
private readonly cache: Cache<Cardano.Tx>;
// Feature flag to enable credential-based UTXO fetching (used in utxoByAddresses)
protected readonly queryUtxosByCredentials: boolean;
// Overload 1: Old signature (backward compatibility)
constructor(dependencies: BlockfrostUtxoProviderDependencies);
// Overload 2: New signature with options
constructor(options: BlockfrostUtxoProviderOptions, dependencies: BlockfrostUtxoProviderDependencies);
// Implementation signature
constructor(
optionsOrDependencies: BlockfrostUtxoProviderOptions | BlockfrostUtxoProviderDependencies,
maybeDependencies?: BlockfrostUtxoProviderDependencies
) {
// Detect which overload was used
const isOldSignature = 'cache' in optionsOrDependencies;
const options = isOldSignature ? {} : (optionsOrDependencies as BlockfrostUtxoProviderOptions);
const dependencies = isOldSignature
? (optionsOrDependencies as BlockfrostUtxoProviderDependencies)
: maybeDependencies!;
super(dependencies.client, dependencies.logger);
this.cache = dependencies.cache;
this.queryUtxosByCredentials = options.queryUtxosByCredentials ?? false;
}
protected async fetchUtxos(addr: Cardano.PaymentAddress, paginationQueryString: string): Promise<Cardano.Utxo[]> {
const queryString = `addresses/${addr.toString()}/utxos?${paginationQueryString}`;
const utxos = await this.request<Responses['address_utxo_content']>(queryString);
const utxoPromises = utxos.map((utxo) =>
this.fetchDetailsFromCBOR(utxo.tx_hash).then((tx) => {
const txOut = tx ? tx.body.outputs.find((output) => output.address === utxo.address) : undefined;
return BlockfrostToCore.addressUtxoContent(addr.toString(), utxo, txOut);
})
);
return Promise.all(utxoPromises);
}
private async processUtxoContents(utxoContents: Responses['address_utxo_content']): Promise<Cardano.Utxo[]> {
const utxoPromises = utxoContents.map((utxo) =>
this.fetchDetailsFromCBOR(utxo.tx_hash).then((tx) => {
const txOut = tx ? tx.body.outputs.find((output) => output.address === utxo.address) : undefined;
return BlockfrostToCore.addressUtxoContent(utxo.address, utxo, txOut);
})
);
return Promise.all(utxoPromises);
}
protected async fetchUtxosByPaymentCredential(credential: Cardano.PaymentCredential): Promise<Cardano.Utxo[]> {
const utxoContents = await fetchSequentially<
Responses['address_utxo_content'][0],
Responses['address_utxo_content'][0]
>({
request: async (paginationQueryString) => {
const queryString = `addresses/${credential}/utxos?${paginationQueryString}`;
return this.request<Responses['address_utxo_content']>(queryString);
}
});
return this.processUtxoContents(utxoContents);
}
protected async fetchUtxosByRewardAccount(
rewardAccount: Cardano.RewardAccount,
paymentCredentialFilter: (address: Cardano.PaymentAddress) => boolean
): Promise<Cardano.Utxo[]> {
const utxoContents = await fetchSequentially<
Responses['address_utxo_content'][0],
Responses['address_utxo_content'][0]
>({
request: async (paginationQueryString) => {
const queryString = `accounts/${rewardAccount}/utxos?${paginationQueryString}`;
return this.request<Responses['address_utxo_content']>(queryString);
}
});
// Filter UTXOs by payment credential before processing
const filteredUtxos = utxoContents.filter((utxo) => paymentCredentialFilter(Cardano.PaymentAddress(utxo.address)));
// Log debug message about filtering
Iif (filteredUtxos.length < utxoContents.length) {
this.logger.debug(
`Filtered ${utxoContents.length - filteredUtxos.length} UTXO(s) from reward account query, kept ${
filteredUtxos.length
}`
);
}
return this.processUtxoContents(filteredUtxos);
}
protected mergeAndDeduplicateUtxos(
paymentUtxos: Cardano.Utxo[],
rewardAccountUtxos: Cardano.Utxo[],
skippedAddressUtxos: Cardano.Utxo[]
): Cardano.Utxo[] {
const allUtxos = [...paymentUtxos, ...rewardAccountUtxos, ...skippedAddressUtxos];
// Deduplicate by txId + index combination
const deduplicated = uniqBy(allUtxos, (utxo: Cardano.Utxo) => `${utxo[0].txId}#${utxo[0].index}`);
// Sort using sortUtxoByTxIn from core
return deduplicated.sort(sortUtxoByTxIn);
}
private logSkippedAddresses(skippedAddresses: {
byron: Cardano.PaymentAddress[];
pointer: Cardano.PaymentAddress[];
}): void {
Iif (skippedAddresses.byron.length > 0) {
this.logger.info(
`Found ${skippedAddresses.byron.length} Byron address(es), falling back to per-address fetching`
);
}
Iif (skippedAddresses.pointer.length > 0) {
this.logger.info(
`Found ${skippedAddresses.pointer.length} Pointer address(es), falling back to per-address fetching`
);
}
}
private logMinimizationStats(
totalAddresses: number,
minimized: { paymentCredentials: Map<unknown, unknown>; rewardAccounts: Map<unknown, unknown> },
skippedAddresses: { byron: Cardano.PaymentAddress[]; pointer: Cardano.PaymentAddress[] }
): void {
const paymentCredCount = minimized.paymentCredentials.size;
const rewardAccountCount = minimized.rewardAccounts.size;
const skippedCount = skippedAddresses.byron.length + skippedAddresses.pointer.length;
const totalQueries = paymentCredCount + rewardAccountCount + skippedCount;
this.logger.debug(
`Minimized ${totalAddresses} address(es) to ${totalQueries} query/queries: ` +
`${paymentCredCount} payment credential(s), ${rewardAccountCount} reward account(s), ${skippedCount} skipped address(es)`
);
}
private async fetchAllByPaymentCredentials(
credentials: Map<Cardano.PaymentCredential, Cardano.PaymentAddress[]>
): Promise<Cardano.Utxo[]> {
const results = await Promise.all(
[...credentials.keys()].map((credential) => this.fetchUtxosByPaymentCredential(credential))
);
return results.flat();
}
private async fetchAllByRewardAccounts(
rewardAccounts: Map<Cardano.RewardAccount, Cardano.PaymentAddress[]>,
paymentCredentialFilter: (address: Cardano.PaymentAddress) => boolean
): Promise<Cardano.Utxo[]> {
const results = await Promise.all(
[...rewardAccounts.keys()].map((rewardAccount) =>
this.fetchUtxosByRewardAccount(rewardAccount, paymentCredentialFilter)
)
);
return results.flat();
}
private async fetchUtxosForAddresses(addresses: Cardano.PaymentAddress[]): Promise<Cardano.Utxo[]> {
const results = await Promise.all(
addresses.map((address) =>
fetchSequentially<Cardano.Utxo, Cardano.Utxo>({
request: async (paginationQueryString) => await this.fetchUtxos(address, paginationQueryString)
})
)
);
return results.flat();
}
private async fetchSkippedAddresses(skippedAddresses: {
byron: Cardano.PaymentAddress[];
pointer: Cardano.PaymentAddress[];
}): Promise<Cardano.Utxo[]> {
const allSkippedAddresses = [...skippedAddresses.byron, ...skippedAddresses.pointer];
return this.fetchUtxosForAddresses(allSkippedAddresses);
}
private async fetchUtxosByCredentials(addresses: Cardano.PaymentAddress[]): Promise<Cardano.Utxo[]> {
const addressGroups = extractCredentials(addresses);
this.logSkippedAddresses(addressGroups.skippedAddresses);
const minimized = minimizeCredentialSet({
paymentCredentials: addressGroups.paymentCredentials,
rewardAccounts: addressGroups.rewardAccounts
});
this.logMinimizationStats(addresses.length, minimized, addressGroups.skippedAddresses);
const paymentCredentialFilter = createPaymentCredentialFilter(addresses);
this.logger.debug(
`Fetching UTXOs for ${minimized.paymentCredentials.size} payment credential(s) and ${minimized.rewardAccounts.size} reward account(s)`
);
const [paymentUtxos, rewardAccountUtxos, skippedAddressUtxos] = await Promise.all([
this.fetchAllByPaymentCredentials(minimized.paymentCredentials),
this.fetchAllByRewardAccounts(minimized.rewardAccounts, paymentCredentialFilter),
this.fetchSkippedAddresses(addressGroups.skippedAddresses)
]);
const result = this.mergeAndDeduplicateUtxos(paymentUtxos, rewardAccountUtxos, skippedAddressUtxos);
this.logger.debug(`Merged results: ${result.length} UTXO(s)`);
return result;
}
async fetchCBOR(hash: string): Promise<string> {
return this.request<Responses['tx_content_cbor']>(`txs/${hash}/cbor`)
.then((response) => {
if (response.cbor) return response.cbor;
throw new Error('CBOR is null');
})
.catch((_error) => {
throw new Error('CBOR fetch failed');
});
}
protected async fetchDetailsFromCBOR(hash: string) {
const cached = await this.cache.get(hash);
if (cached) return cached;
const result = await this.fetchCBOR(hash)
.then((cbor) => {
const tx = Serialization.Transaction.fromCbor(Serialization.TxCBOR(cbor)).toCore();
this.logger.debug('Fetched details from CBOR for tx', hash);
return tx;
})
.catch((error) => {
this.logger.warn('Failed to fetch details from CBOR for tx', hash, error);
return null;
});
if (!result) {
return null;
}
void this.cache.set(hash, result);
return result;
}
/**
* Retrieves UTXOs for the given addresses.
*
* Important assumption: All addresses provided must be addresses where the caller
* controls the payment credential. When queryUtxosByCredentials is enabled, this
* provider queries by reward accounts (stake addresses) and filters results to only
* include UTXOs with payment credentials extracted from the input addresses. UTXOs
* with payment credentials not present in the input will be excluded.
*/
public async utxoByAddresses({ addresses }: UtxoByAddressesArgs): Promise<Cardano.Utxo[]> {
try {
// If feature flag is disabled, use original implementation
if (!this.queryUtxosByCredentials) {
return this.fetchUtxosForAddresses(addresses);
}
// Use credential-based fetching
return await this.fetchUtxosByCredentials(addresses);
} catch (error) {
throw this.toProviderError(error);
}
}
}
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