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import { Assets } from '../types';
import { BalanceTracker, Milliseconds, TransactionsTracker } from './types';
import { Logger } from 'ts-log';
import {
Observable,
buffer,
concat,
connect,
debounceTime,
distinctUntilChanged,
filter,
firstValueFrom,
map,
of,
share,
switchMap,
take,
tap
} from 'rxjs';
import { RetryBackoffConfig } from 'backoff-rxjs';
import { TrackedAssetProvider } from './ProviderTracker';
import { concatAndCombineLatest } from '@cardano-sdk/util-rxjs';
import { deepEquals, isNotNil } from '@cardano-sdk/util';
import { newTransactions$ } from './TransactionsTracker';
import { pollProvider } from './util';
import chunk from 'lodash/chunk.js';
import uniq from 'lodash/uniq.js';
const isAssetInfoComplete = (assetInfo: Asset.AssetInfo): boolean =>
assetInfo.nftMetadata !== undefined && assetInfo.tokenMetadata !== undefined;
const isEveryAssetInfoComplete = (assetInfos: Asset.AssetInfo[]): boolean => assetInfos.every(isAssetInfoComplete);
/** Buffers the source Observable values emitted at the same time (within 1 ms) */
const bufferTick =
<T>() =>
(source$: Observable<T>) =>
source$.pipe(connect((shared$) => shared$.pipe(buffer(shared$.pipe(debounceTime(1))))));
const ASSET_INFO_FETCH_CHUNK_SIZE = 100;
const ONE_DAY = 24 * 60 * 60 * 1000;
const ONE_WEEK = 7 * ONE_DAY;
const isInBalance = (assetId: Cardano.AssetId, balance: Cardano.Value): boolean =>
balance.assets?.has(assetId) ?? false;
/**
* Splits a list of asset IDs into cached and uncached groups based on their presence in the cache,
* their freshness, and their balance status:
*
* 1. Assets not in Balance:
* - Always use the cached version if present in the cache, ignoring freshness.
* 2. Assets in Balance:
* - Use the cached version only if it exists and its `staleAt` timestamp did not expire.
* 3. Uncached Assets:
* - If an asset is not in the cache or does not meet the above criteria, mark it as uncached.
*/
const splitCachedAndUncachedAssets = (
cache: Assets,
balance: Cardano.Value,
assetIds: Cardano.AssetId[]
): { cachedAssets: Assets; uncachedAssetIds: Cardano.AssetId[] } => {
const cachedAssets: Assets = new Map();
const uncachedAssetIds: Cardano.AssetId[] = [];
const now = new Date();
for (const id of assetIds) {
const cachedAssetInfo = cache.get(id);
if (!cachedAssetInfo) {
uncachedAssetIds.push(id);
continue;
}
const { staleAt } = cachedAssetInfo;
const expired = !staleAt || new Date(staleAt) < now;
const mustFetch = !isAssetInfoComplete(cachedAssetInfo) || (isInBalance(id, balance) && expired);
if (mustFetch) {
uncachedAssetIds.push(id);
} else {
cachedAssets.set(id, cachedAssetInfo);
}
}
return { cachedAssets, uncachedAssetIds };
};
const getAssetsWithCache = async (
assetIdsChunk: Cardano.AssetId[],
assetCache$: Observable<Assets>,
totalBalance$: Observable<Cardano.Value>,
assetProvider: TrackedAssetProvider,
maxAssetInfoCacheAge: Milliseconds
): Promise<Asset.AssetInfo[]> => {
const [cache, totalValue] = await Promise.all([firstValueFrom(assetCache$), firstValueFrom(totalBalance$)]);
const { cachedAssets, uncachedAssetIds } = splitCachedAndUncachedAssets(cache, totalValue, assetIdsChunk);
if (uncachedAssetIds.length === 0) {
// If all assets are cached we wont perform any fetches from assetProvider, but still need to
// mark it as initialized.
if (!assetProvider.stats.getAsset$.value.initialized) {
assetProvider.setStatInitialized(assetProvider.stats.getAsset$);
}
return [...cachedAssets.values()];
}
const fetchedAssets = await assetProvider.getAssets({
assetIds: uncachedAssetIds,
extraData: { nftMetadata: true, tokenMetadata: true }
});
const now = Date.now();
const updatedFetchedAssets = fetchedAssets.map((asset) => {
const randomDelta = Math.floor(Math.random() * 2 * ONE_DAY); // Random time between 0 and 2 days
return {
...asset,
staleAt: new Date(now + maxAssetInfoCacheAge + randomDelta)
};
});
return [...cachedAssets.values(), ...updatedFetchedAssets];
};
export const createAssetService =
(
assetProvider: TrackedAssetProvider,
assetCache$: Observable<Assets>,
totalBalance$: Observable<Cardano.Value>,
retryBackoffConfig: RetryBackoffConfig,
logger: Logger,
maxAssetInfoCacheAge: Milliseconds = ONE_WEEK
// eslint-disable-next-line max-params
) =>
(assetIds: Cardano.AssetId[]) =>
concatAndCombineLatest(
chunk(assetIds, ASSET_INFO_FETCH_CHUNK_SIZE).map((assetIdsChunk) =>
pollProvider({
logger,
pollUntil: isEveryAssetInfoComplete,
retryBackoffConfig,
sample: () =>
getAssetsWithCache(assetIdsChunk, assetCache$, totalBalance$, assetProvider, maxAssetInfoCacheAge),
trigger$: of(true) // fetch only once
})
)
).pipe(map((arr) => arr.flat())); // Concatenate the chunk results
export type AssetService = ReturnType<typeof createAssetService>;
export interface AssetsTrackerProps {
transactionsTracker: TransactionsTracker;
assetProvider: TrackedAssetProvider;
retryBackoffConfig: RetryBackoffConfig;
logger: Logger;
assetsCache$: Observable<Assets>;
balanceTracker: BalanceTracker;
maxAssetInfoCacheAge?: Milliseconds;
}
interface AssetsTrackerInternals {
assetService?: AssetService;
}
const uniqueAssetIds = ({ body: { outputs } }: Cardano.OnChainTx) =>
outputs.flatMap(({ value: { assets } }) => (assets ? [...assets.keys()] : []));
const flatUniqueAssetIds = (txes: Cardano.OnChainTx[]) => uniq(txes.flatMap(uniqueAssetIds));
export const createAssetsTracker = (
{
assetProvider,
assetsCache$,
transactionsTracker: { history$ },
balanceTracker: {
utxo: { total$ }
},
retryBackoffConfig,
logger,
maxAssetInfoCacheAge
}: AssetsTrackerProps,
{
assetService = createAssetService(
assetProvider,
assetsCache$,
total$,
retryBackoffConfig,
logger,
maxAssetInfoCacheAge
)
}: AssetsTrackerInternals = {}
) =>
new Observable<Map<Cardano.AssetId, Asset.AssetInfo>>((subscriber) => {
let fetchedAssetInfoMap = new Map<Cardano.AssetId, Asset.AssetInfo>();
const allAssetIds = new Set<Cardano.AssetId>();
const sharedHistory$ = history$.pipe(share());
return concat(
sharedHistory$.pipe(
map((historyTxs) => uniq(historyTxs.flatMap(uniqueAssetIds))),
tap((assetIds) =>
logger.debug(
assetIds.length > 0
? `Historical total assets: ${assetIds.length}`
: 'Setting assetProvider stats as initialized'
)
),
tap((assetIds) => assetIds.length === 0 && assetProvider.setStatInitialized(assetProvider.stats.getAsset$)),
take(1)
),
newTransactions$(sharedHistory$).pipe(
bufferTick(),
map(flatUniqueAssetIds),
map((assetIds) => {
const newAssetIds = assetIds.filter((assetId) => !allAssetIds.has(assetId));
// re-fetch all asset infos that either
// - weren't fetched yet
// - were fetched with incomplete metadata
const assetIdsToRefetch = [...allAssetIds.values()].filter((assetId) => {
const assetInfo = fetchedAssetInfoMap.get(assetId);
return !assetInfo || !isAssetInfoComplete(assetInfo);
});
// When we see a CIP-68 reference NFT, it means metadata for a user NFT that we own might have changed
const assetsWithCip68MetadataUpdates = assetIds
.map((assetId) => {
const assetName = Cardano.AssetId.getAssetName(assetId);
const decoded = Asset.AssetNameLabel.decode(assetName);
if (decoded?.label === Asset.AssetNameLabelNum.ReferenceNFT) {
return Cardano.AssetId.fromParts(
Cardano.AssetId.getPolicyId(assetId),
Asset.AssetNameLabel.encode(decoded.content, Asset.AssetNameLabelNum.UserNFT)
);
}
})
.filter(isNotNil);
return uniq([...newAssetIds, ...assetIdsToRefetch, ...assetsWithCip68MetadataUpdates]);
}),
filter((assetIds) => assetIds.length > 0)
)
)
.pipe(
tap((assetIds) => {
for (const assetId of assetIds) {
allAssetIds.add(assetId);
}
}),
// Restart inner observable if there are new assets to be fetched,
// otherwise the whole pipe will hang waiting for all assetInfos to resolve
switchMap((assetIdsToFetch) => (assetIdsToFetch.length > 0 ? assetService(assetIdsToFetch) : of([]))),
map((fetchedAssetInfos) => [...[...fetchedAssetInfoMap.values()].filter(isNotNil), ...fetchedAssetInfos]),
distinctUntilChanged(deepEquals), // It optimizes to not process duplicate emissions of the assets
tap((assetInfos) => logger.debug(`Got metadata for ${assetInfos.length} assets`)),
map((assetInfos) => new Map(assetInfos.map((assetInfo) => [assetInfo.assetId, assetInfo]))),
tap((v) => (fetchedAssetInfoMap = v))
)
.subscribe(subscriber);
});
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