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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.withFunctionTrace(jsonModel))
.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().fold(({ isLeft }) =>
traceableEither.trace.trace(ParseJsonMetric[isLeft ? "failure" : "success"])
),
),
)
.map(
TraceUtil.promiseify((traceableEitherJson) =>
traceableEitherJson
.get()
.mapRight((j) => traceableEitherJson.move(j))
.flatMap(jsonTransformer),
),
)
.get();
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