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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");
export const jsonModel = <MessageT>(
jsonTransformer: JsonTransformer<MessageT>,
): RequestFilter<MessageT> =>
(r: ITraceable<PenguenoRequest, ServerTrace>) =>
r.bimap(TraceUtil.withMetricTrace(ParseJsonMetric))
.map((j) =>
Either.fromFailableAsync<Error, MessageT>(j.get().json())
.then((either) =>
either.mapLeft((errReason) => {
j.trace.addTrace(LogLevel.WARN).trace(`${errReason}`);
return new PenguenoError(
"seems to be invalid JSON (>//<) can you fix?",
400,
);
})
)
)
.peek(
TraceUtil.promiseify((traceableEither) =>
traceableEither.get().mapBoth(
() => traceableEither.trace.trace(ParseJsonMetric.failure),
() => traceableEither.trace.trace(ParseJsonMetric.success),
)
),
)
.map(
TraceUtil.promiseify((traceableEitherJson) =>
traceableEitherJson.get()
.mapRight(traceableEitherJson.move)
.flatMap(jsonTransformer)
),
)
.get();
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