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import {
Either,
type IEither,
type ITraceable,
LogLevel,
Metric,
PenguenoError,
type PenguenoRequest,
type RequestFilter,
type ServerTrace,
TraceUtil,
} from '@emprespresso/pengueno';
export interface JsonTransformer<R, ParsedJson = unknown> {
(json: ITraceable<ParsedJson, ServerTrace>): IEither<PenguenoError, R>;
}
const ParseJsonMetric = Metric.fromName('JsonParse').asResult();
export const jsonModel =
<MessageT>(jsonTransformer: JsonTransformer<MessageT>): RequestFilter<MessageT> =>
(r: ITraceable<PenguenoRequest, ServerTrace>) =>
r
.flatMap(TraceUtil.withFunctionTrace(jsonModel))
.flatMap(TraceUtil.withMetricTrace(ParseJsonMetric))
.map((j) =>
Either.fromFailableAsync<Error, MessageT>(<Promise<MessageT>>j.get().req.json()).then((either) =>
either.mapLeft((errReason) => {
j.trace.traceScope(LogLevel.WARN).trace(errReason);
return new PenguenoError('seems to be invalid JSON (>//<) can you fix?', 400);
}),
),
)
.flatMapAsync(TraceUtil.promiseify(TraceUtil.traceResultingEither(ParseJsonMetric)))
.map(
TraceUtil.promiseify((traceableEitherJson) =>
traceableEitherJson
.get()
.mapRight((j) => traceableEitherJson.move(j))
.flatMap(jsonTransformer),
),
)
.get();
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