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opreation-factory.ts
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opreation-factory.ts
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import { BlockResponse } from '@taquito/rpc';
import {
concat,
defer,
from,
MonoTypeOperatorFunction,
Observable,
of,
range,
ReplaySubject,
SchedulerLike,
throwError,
timer,
} from 'rxjs';
import {
concatMap,
distinctUntilKeyChanged,
first,
shareReplay,
startWith,
switchMap,
timeoutWith,
} from 'rxjs/operators';
import { Context } from '../context';
import { DelegationWalletOperation } from './delegation-operation';
import { WalletOperation } from './operation';
import { OriginationWalletOperation } from './origination-operation';
import { TransactionWalletOperation } from './transaction-operation';
export const cacheUntil = <T>(
cacheUntilObs: Observable<any>
): MonoTypeOperatorFunction<T> => source => {
let subject: ReplaySubject<T> | null = null;
return defer(() => {
if (!subject) {
subject = new ReplaySubject<T>();
source.pipe(first()).subscribe(subject);
cacheUntilObs.pipe(first()).subscribe(() => {
subject = null;
});
}
return subject;
});
};
export const createNewPollingBasedHeadObservable = (
pollingTimer: Observable<number>,
sharedHeadOb: Observable<BlockResponse>,
context: Context,
scheduler?: SchedulerLike
): Observable<BlockResponse> => {
return pollingTimer.pipe(
switchMap(() => sharedHeadOb),
distinctUntilKeyChanged('hash'),
timeoutWith(
context.config.confirmationPollingTimeoutSecond * 1000,
throwError(new Error('Confirmation polling timed out')),
scheduler
),
shareReplay({
refCount: true,
scheduler,
})
);
};
export interface OperationFactoryConfig {
blockIdentifier?: string;
}
export class OperationFactory {
constructor(private context: Context) {}
// Cache the last block for one second across all operations
private sharedHeadObs = defer(() => from(this.context.rpc.getBlock())).pipe(
cacheUntil(timer(0, 1000))
);
private createNewHeadObservable() {
return createNewPollingBasedHeadObservable(
timer(0, this.context.config.confirmationPollingIntervalSecond * 1000),
this.sharedHeadObs,
this.context
);
}
private createPastBlockWalker(startBlock: string, count: number = 1) {
return from(this.context.rpc.getBlock({ block: startBlock })).pipe(
switchMap(block => {
if (count === 1) {
return of(block);
}
return range(block.header.level, count - 1).pipe(
startWith(block),
concatMap(async level => {
return this.context.rpc.getBlock({ block: String(level) });
})
);
})
);
}
private createHeadObservableFromConfig({ blockIdentifier }: OperationFactoryConfig) {
const observableSequence: Observable<BlockResponse>[] = [];
if (blockIdentifier) {
observableSequence.push(this.createPastBlockWalker(blockIdentifier));
}
observableSequence.push(this.createNewHeadObservable());
return concat(...observableSequence);
}
createOperation(hash: string, config: OperationFactoryConfig = {}): WalletOperation {
return new WalletOperation(
hash,
this.context.clone(),
this.createHeadObservableFromConfig(config)
);
}
createTransactionOperation(
hash: string,
config: OperationFactoryConfig = {}
): TransactionWalletOperation {
return new TransactionWalletOperation(
hash,
this.context.clone(),
this.createHeadObservableFromConfig(config)
);
}
createDelegationOperation(
hash: string,
config: OperationFactoryConfig = {}
): DelegationWalletOperation {
return new DelegationWalletOperation(
hash,
this.context.clone(),
this.createHeadObservableFromConfig(config)
);
}
createOriginationOperation(
hash: string,
config: OperationFactoryConfig = {}
): OriginationWalletOperation {
return new OriginationWalletOperation(
hash,
this.context.clone(),
this.createHeadObservableFromConfig(config)
);
}
}