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| 1 | +import { Assets, HandleInfo } from '../types'; |
| 2 | +import { Cardano } from '@cardano-sdk/core'; |
| 3 | +import { |
| 4 | + EMPTY, |
| 5 | + Observable, |
| 6 | + combineLatest, |
| 7 | + distinctUntilChanged, |
| 8 | + map, |
| 9 | + mergeMap, |
| 10 | + of, |
| 11 | + shareReplay, |
| 12 | + withLatestFrom |
| 13 | +} from 'rxjs'; |
| 14 | +import { Logger } from 'ts-log'; |
| 15 | +import { deepEquals, isNotNil } from '@cardano-sdk/util'; |
| 16 | +import { sameArrayItems, strictEquals } from './util'; |
| 17 | +import uniqBy from 'lodash/uniqBy'; |
| 18 | + |
| 19 | +export interface HandlesTrackerProps { |
| 20 | + utxo$: Observable<Cardano.Utxo[]>; |
| 21 | + assetInfo$: Observable<Assets>; |
| 22 | + tip$: Observable<Cardano.Tip>; |
| 23 | + handlePolicyIds: Cardano.PolicyId[]; |
| 24 | + logger: Logger; |
| 25 | +} |
| 26 | + |
| 27 | +const handleInfoEquals = (a: HandleInfo, b: HandleInfo) => |
| 28 | + a.assetId === b.assetId && |
| 29 | + a.resolvedAt.hash === b.resolvedAt.hash && |
| 30 | + deepEquals(a.tokenMetadata, b.tokenMetadata) && |
| 31 | + deepEquals(a.nftMetadata, b.nftMetadata); |
| 32 | + |
| 33 | +export const createHandlesTracker = ({ tip$, assetInfo$, handlePolicyIds, logger, utxo$ }: HandlesTrackerProps) => |
| 34 | + combineLatest([ |
| 35 | + utxo$.pipe( |
| 36 | + map((utxo) => |
| 37 | + utxo.flatMap(([_, txOut]) => |
| 38 | + uniqBy( |
| 39 | + [...(txOut.value.assets?.keys() || [])] |
| 40 | + .filter((assetId) => handlePolicyIds.some((policyId) => assetId.startsWith(policyId))) |
| 41 | + .map((assetId) => ({ |
| 42 | + handleAssetId: assetId, |
| 43 | + txOut |
| 44 | + })), |
| 45 | + ({ handleAssetId }) => handleAssetId |
| 46 | + ) |
| 47 | + ) |
| 48 | + ), |
| 49 | + distinctUntilChanged((a, b) => sameArrayItems(a, b, strictEquals)), |
| 50 | + withLatestFrom(tip$) |
| 51 | + ), |
| 52 | + assetInfo$ |
| 53 | + ]).pipe( |
| 54 | + mergeMap(([[utxo, tip], assets]) => { |
| 55 | + const handlesWithAssetInfo = utxo |
| 56 | + .map(({ handleAssetId, txOut }): HandleInfo | null => { |
| 57 | + const assetInfo = assets.get(handleAssetId); |
| 58 | + if (!assetInfo) { |
| 59 | + logger.debug(`Asset info not (yet?) found for ${handleAssetId}`); |
| 60 | + return null; |
| 61 | + } |
| 62 | + return { |
| 63 | + ...assetInfo, |
| 64 | + handle: Buffer.from(Cardano.AssetId.getAssetName(handleAssetId), 'hex').toString('utf8'), |
| 65 | + hasDatum: !!txOut.datum, |
| 66 | + resolvedAddresses: { |
| 67 | + cardano: txOut.address |
| 68 | + }, |
| 69 | + resolvedAt: tip |
| 70 | + }; |
| 71 | + }) |
| 72 | + .filter(isNotNil); |
| 73 | + if (utxo.length > 0 && handlesWithAssetInfo.length === 0) { |
| 74 | + // AssetInfo is still resolving |
| 75 | + return EMPTY; |
| 76 | + } |
| 77 | + return of( |
| 78 | + handlesWithAssetInfo.filter(({ handle, supply }) => { |
| 79 | + if (supply > 1n) { |
| 80 | + logger.warn(`Omitting handle with supply >1: ${handle}`); |
| 81 | + return false; |
| 82 | + } |
| 83 | + return true; |
| 84 | + }) |
| 85 | + ); |
| 86 | + }), |
| 87 | + distinctUntilChanged((a, b) => sameArrayItems(a, b, handleInfoEquals)), |
| 88 | + shareReplay({ bufferSize: 1, refCount: true }) |
| 89 | + ); |
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