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/*
This file is part of GNU Taler
(C) 2023-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* Imports.
*/
import {
HttpResponse,
readResponseJsonOrThrow,
readSuccessResponseJsonOrThrow,
readTalerErrorResponse,
} from "./http-common.js";
import {
Codec,
HttpStatusCode,
TalerError,
TalerErrorCode,
TalerErrorDetail,
} from "./index.js";
// type OperationFailWithBodyOrNever<ErrorEnum, ErrorMap> =
// ErrorEnum extends keyof ErrorMap ? OperationFailWithBody<ErrorMap> : never;
export type OperationResult<Body, ErrorEnum, K = never> =
| OperationOk<Body>
| OperationAlternative<ErrorEnum, any>
| OperationFail<ErrorEnum>
// | OperationFailWithBodyOrNever<ErrorEnum, K>;
export function isOperationOk<T, E>(
c: OperationResult<T, E>,
): c is OperationOk<T> {
return c.type === "ok";
}
export function isOperationFail<T, E>(
c: OperationResult<T, E>,
): c is OperationFail<E> {
return c.type === "fail";
}
/**
* successful operation
*/
export interface OperationOk<BodyT> {
type: "ok";
/**
* Parsed response body.
*/
body: BodyT;
}
/**
* unsuccessful operation, see details
*/
export interface OperationFail<T> {
type: "fail";
/**
* Error case (either HTTP status code or TalerErrorCode)
*/
case: T;
detail?: TalerErrorDetail;
}
/**
* unsuccessful operation, see body
*/
export interface OperationAlternative<T, B> {
type: "fail";
case: T;
body: B;
}
// export interface OperationFailWithBody<B> {
// type: "fail";
// case: keyof B;
// body: B[OperationFailWithBody<B>["case"]];
// }
export async function opSuccessFromHttp<T>(
resp: HttpResponse,
codec: Codec<T>,
): Promise<OperationOk<T>> {
const body = await readSuccessResponseJsonOrThrow(resp, codec);
return { type: "ok" as const, body };
}
/**
* Success case, but instead of the body we're returning a fixed response
* to the client.
*/
export function opFixedSuccess<T>(body: T): OperationOk<T> {
return { type: "ok" as const, body };
}
export function opEmptySuccess(resp: HttpResponse): OperationOk<void> {
return { type: "ok" as const, body: void 0 };
}
export async function opKnownFailure<T>(
case_: T): Promise<OperationFail<T>> {
return { type: "fail", case: case_ };
}
export async function opKnownFailureWithBody<T,B>(
case_: T,
body: B,
): Promise<OperationAlternative<T, B>> {
return { type: "fail", case: case_, body };
}
export async function opKnownAlternativeFailure<T extends HttpStatusCode, B>(
resp: HttpResponse,
s: T,
codec: Codec<B>,
): Promise<OperationAlternative<T, B>> {
const body = await readResponseJsonOrThrow(resp, codec);
return { type: "fail", case: s, body };
}
export async function opKnownHttpFailure<T extends HttpStatusCode>(
s: T,
resp: HttpResponse,
): Promise<OperationFail<T>> {
const detail = await readTalerErrorResponse(resp);
return { type: "fail", case: s, detail };
}
export function opKnownTalerFailure<T extends TalerErrorCode>(
s: T,
detail: TalerErrorDetail,
): OperationFail<T> {
return { type: "fail", case: s, detail };
}
export function opUnknownFailure(
resp: HttpResponse,
error: TalerErrorDetail,
): never {
throw TalerError.fromDetail(
TalerErrorCode.WALLET_UNEXPECTED_REQUEST_ERROR,
{
requestUrl: resp.requestUrl,
requestMethod: resp.requestMethod,
httpStatusCode: resp.status,
errorResponse: error,
},
`Unexpected HTTP status ${resp.status} in response`,
);
}
/**
* Convenience function to throw an error if the operation is not a success.
*/
export function narrowOpSuccessOrThrow<Body, ErrorEnum>(
opName: string,
opRes: OperationResult<Body, ErrorEnum>,
): asserts opRes is OperationOk<Body> {
if (opRes.type !== "ok") {
throw TalerError.fromDetail(
TalerErrorCode.GENERIC_CLIENT_INTERNAL_ERROR,
{
operation: opName,
error: String(opRes.case),
detail: "detail" in opRes ? opRes.detail : undefined,
},
`Operation ${opName} failed: ${String(opRes.case)}`,
);
}
}
export async function succeedOrThrow<R>(
promise: Promise<OperationResult<R, unknown>>,
): Promise<R> {
const resp = await promise;
if (isOperationOk(resp)) {
return resp.body;
}
if (isOperationFail(resp)) {
throw TalerError.fromUncheckedDetail({ ...resp, case: resp.case } as any);
}
throw TalerError.fromException(resp);
}
export async function alternativeOrThrow<Error,Body, Alt>(
s: Error,
promise: Promise<OperationOk<Body>
| OperationAlternative<Error, Alt>
| OperationFail<Error>>,
): Promise<Alt> {
const resp = await promise;
if (isOperationOk(resp)) {
throw TalerError.fromException(
new Error(`request succeed but failure "${s}" was expected`),
);
}
if (isOperationFail(resp) && resp.case !== s) {
throw TalerError.fromException(
new Error(
`request failed with "${JSON.stringify(
resp,
)}" but case "${s}" was expected`,
),
);
}
return (resp as any).body;
}
export async function failOrThrow<E>(
s: E,
promise: Promise<OperationResult<unknown, E>>,
): Promise<TalerErrorDetail | undefined> {
const resp = await promise;
if (isOperationOk(resp)) {
throw TalerError.fromException(
new Error(`request succeed but failure "${s}" was expected`),
);
}
if (isOperationFail(resp) && resp.case === s) {
return resp.detail;
}
throw TalerError.fromException(
new Error(
`request failed with "${JSON.stringify(
resp,
)}" but case "${s}" was expected`,
),
);
}
export type ResultByMethod<
TT extends object,
p extends keyof TT,
> = TT[p] extends (...args: any[]) => infer Ret
? Ret extends Promise<infer Result>
? Result extends OperationResult<any, any>
? Result
: never
: never //api always use Promises
: never; //error cases just for functions
export type FailCasesByMethod<TT extends object, p extends keyof TT> = Exclude<
ResultByMethod<TT, p>,
OperationOk<any>
>;
export type RedirectResult = { redirectURL: URL };
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