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/*
This file is part of GNU Taler
(C) 2022-2024 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/>
*/
import {
CacheEvictor,
LibtoolVersion,
ObservabilityEvent,
ObservableHttpClientLibrary,
TalerAuthenticationHttpClient,
TalerError,
TalerMerchantApi,
TalerMerchantInstanceCacheEviction,
TalerMerchantManagementCacheEviction,
TalerMerchantManagementHttpClient,
} from "@gnu-taler/taler-util";
import {
ComponentChildren,
FunctionComponent,
VNode,
createContext,
h,
} from "preact";
import { useContext, useEffect, useState } from "preact/hooks";
import { BrowserFetchHttpLib } from "../index.browser.js";
import {
APIClient,
ActiviyTracker,
MerchantLib,
Subscriber,
} from "./activity.js";
/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/
export type MerchantContextType = {
url: URL;
config: TalerMerchantApi.TalerMerchantConfigResponse;
lib: MerchantLib;
hints: VersionHint[];
onActivity: Subscriber<ObservabilityEvent>;
cancelRequest: (eventId: string) => void;
changeBackend: (url: URL) => void;
};
// FIXME: below
// @ts-expect-error default value to undefined, should it be another thing?
const MerchantContext = createContext<MerchantContextType>(undefined);
export const useMerchantApiContext = (): MerchantContextType =>
useContext(MerchantContext);
enum VersionHint {
NONE,
}
type Evictors = {
management?: CacheEvictor<
TalerMerchantManagementCacheEviction | TalerMerchantInstanceCacheEviction
>;
};
type ConfigResult<T> =
| undefined
| { type: "ok"; config: T; hints: VersionHint[] }
| ConfigResultFail<T>;
export type ConfigResultFail<T> =
| { type: "incompatible"; result: T; supported: string }
| { type: "error"; error: TalerError };
const CONFIG_FAIL_TRY_AGAIN_MS = 5000;
export const MerchantApiProvider = ({
baseUrl,
children,
evictors = {},
frameOnError,
}: {
baseUrl: URL;
evictors?: Evictors;
children: ComponentChildren;
frameOnError: FunctionComponent<{
state:
| ConfigResultFail<TalerMerchantApi.TalerMerchantConfigResponse>
| undefined;
}>;
}): VNode => {
const [checked, setChecked] =
useState<ConfigResult<TalerMerchantApi.TalerMerchantConfigResponse>>();
const [merchantEndpoint, changeMerchantEndpoint] = useState(baseUrl);
const { getRemoteConfig, VERSION, lib, cancelRequest, onActivity } =
buildMerchantApiClient(merchantEndpoint, evictors);
useEffect(() => {
let keepRetrying = true;
async function testConfig(): Promise<void> {
try {
const config = await getRemoteConfig();
if (LibtoolVersion.compare(VERSION, config.version)) {
setChecked({ type: "ok", config, hints: [] });
} else {
setChecked({
type: "incompatible",
result: config,
supported: VERSION,
});
}
} catch (error) {
if (error instanceof TalerError) {
if (keepRetrying) {
setTimeout(() => {
testConfig();
}, CONFIG_FAIL_TRY_AGAIN_MS);
}
setChecked({ type: "error", error });
} else {
setChecked({ type: "error", error: TalerError.fromException(error) });
}
}
}
testConfig();
return () => {
// on unload, stop retry
keepRetrying = false;
};
}, []);
if (!checked || checked.type !== "ok") {
return h(frameOnError, { state: checked }, []);
}
const value: MerchantContextType = {
url: merchantEndpoint,
config: checked.config,
onActivity: onActivity,
lib,
cancelRequest,
changeBackend: changeMerchantEndpoint,
hints: checked.hints,
};
return h(MerchantContext.Provider, {
value,
children,
});
};
function buildMerchantApiClient(
url: URL,
evictors: Evictors,
): APIClient<MerchantLib, TalerMerchantApi.TalerMerchantConfigResponse> {
const httpFetch = new BrowserFetchHttpLib({
enableThrottling: true,
requireTls: false,
});
const tracker = new ActiviyTracker<ObservabilityEvent>();
const httpLib = new ObservableHttpClientLibrary(httpFetch, {
observe(ev) {
tracker.notify(ev);
},
});
const instance = new TalerMerchantManagementHttpClient(
url.href,
httpLib,
evictors.management,
);
const authenticate = new TalerAuthenticationHttpClient(
instance.getAuthenticationAPI().href,
httpLib,
);
function getSubInstanceAPI(instanceId: string): MerchantLib {
const api = buildMerchantApiClient(
instance.getSubInstanceAPI(instanceId) as URL,
evictors,
);
return api.lib;
}
async function getRemoteConfig(): Promise<TalerMerchantApi.TalerMerchantConfigResponse> {
const resp = await instance.getConfig();
if (resp.type === "fail") {
if (resp.detail) {
throw TalerError.fromUncheckedDetail(resp.detail);
} else {
throw TalerError.fromException(new Error("failed to get merchant remote config"))
}
}
return resp.body;
}
return {
getRemoteConfig,
VERSION: instance.PROTOCOL_VERSION,
lib: {
instance,
authenticate,
subInstanceApi: getSubInstanceAPI,
},
onActivity: tracker.subscribe,
cancelRequest: httpLib.cancelRequest,
};
}
export const MerchantApiProviderTesting = ({
children,
value,
}: {
value: MerchantContextType;
children: ComponentChildren;
}): VNode => {
return h(MerchantContext.Provider, {
value,
children,
});
};
|
