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/* eslint-disable prefer-spread */
import {
Bootstrap,
ObservableCardanoNode,
ProjectionEvent,
logProjectionProgress,
requestNext
} from '@cardano-sdk/projection';
import { Cardano } from '@cardano-sdk/core';
import { Logger } from 'ts-log';
import { Observable, concat, defer, groupBy, mergeMap, take, takeWhile } from 'rxjs';
import {
PgConnectionConfig,
TypeormDevOptions,
TypeormOptions,
TypeormStabilityWindowBuffer,
WithTypeormContext,
createObservableConnection,
createTypeormTipTracker,
isRecoverableTypeormError,
typeormTransactionCommit,
withTypeormTransaction
} from '@cardano-sdk/projection-typeorm';
import {
PreparedProjection,
ProjectionName,
ProjectionOptions,
prepareTypeormProjection
} from './prepareTypeormProjection';
import { ReconnectionConfig, passthrough, shareRetryBackoff, toEmpty } from '@cardano-sdk/util-rxjs';
import { migrations } from './migrations';
const reconnectionConfig: ReconnectionConfig = {
initialInterval: 50,
maxInterval: 5000
};
export interface CreateTypeormProjectionProps {
projections: ProjectionName[];
blocksBufferLength: number;
connectionConfig$: Observable<PgConnectionConfig>;
devOptions?: TypeormDevOptions;
exitAtBlockNo?: Cardano.BlockNo;
logger: Logger;
cardanoNode: ObservableCardanoNode;
projectionOptions?: ProjectionOptions;
}
const applyMappers =
<T = {}>(selectedMappers: PreparedProjection['mappers']) =>
(evt$: Observable<ProjectionEvent>) =>
evt$.pipe.apply(evt$, selectedMappers as any) as Observable<ProjectionEvent<T>>;
const applyStores =
<T extends WithTypeormContext>(selectedStores: PreparedProjection['stores']) =>
(evt$: Observable<T>) =>
evt$.pipe.apply(evt$, selectedStores as any) as Observable<T>;
/**
* Creates a projection observable that applies a sequence of operators
* required to project requested `projections` into a postgres database.
*
* Uses TypeORM entities and operators defined in 'projection-typeorm' package.
* Dependencies of each projection are defined in ./prepareTypeormProjection.ts
*/
export const createTypeormProjection = ({
blocksBufferLength,
projections,
connectionConfig$,
logger,
devOptions: requestedDevOptions,
cardanoNode,
exitAtBlockNo,
projectionOptions
}: CreateTypeormProjectionProps) => {
const { handlePolicyIds } = { handlePolicyIds: [], ...projectionOptions };
logger.debug(`Creating projection with policyIds ${JSON.stringify(handlePolicyIds)}`);
logger.debug(`Using a ${blocksBufferLength} blocks buffer`);
const { mappers, entities, stores, extensions, willStore } = prepareTypeormProjection(
{
options: projectionOptions,
projections
},
{ logger }
);
const connect = (options?: TypeormOptions, devOptions?: TypeormDevOptions) =>
createObservableConnection({
connectionConfig$,
devOptions,
entities,
extensions,
logger,
options
});
const tipTracker = createTypeormTipTracker({
connection$: connect(),
reconnectionConfig
});
const buffer = new TypeormStabilityWindowBuffer({
connection$: connect(),
logger,
reconnectionConfig
});
const projectionSource$ = Bootstrap.fromCardanoNode({
blocksBufferLength,
buffer,
cardanoNode,
logger,
projectedTip$: tipTracker.tip$
});
return concat(
// initialize database before starting the projector
connect(
{
installExtensions: true,
migrations: migrations.filter(({ entity }) => entities.includes(entity as any)),
migrationsRun: !requestedDevOptions?.synchronize
},
requestedDevOptions
).pipe(take(1), toEmpty),
defer(() =>
projectionSource$.pipe(
applyMappers(mappers),
// if there are any relevant data to write into db
groupBy((evt) => willStore(evt)),
mergeMap((group$) =>
group$.key
? group$.pipe(
shareRetryBackoff(
(evt$) =>
evt$.pipe(
withTypeormTransaction({ connection$: connect() }),
applyStores(stores),
buffer.storeBlockData(),
typeormTransactionCommit()
),
{ shouldRetry: isRecoverableTypeormError }
)
)
: group$
),
tipTracker.trackProjectedTip(),
requestNext(),
logProjectionProgress(logger),
exitAtBlockNo ? takeWhile((event) => event.block.header.blockNo < exitAtBlockNo) : passthrough()
)
)
);
};
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