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/*
This file is part of GNU Taler
(C) 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 {
AbsoluteTime,
CancellationToken,
ObservabilityEvent,
} from "./index.js";
import {
HttpRequestLibrary,
HttpRequestOptions,
HttpResponse,
} from "./http-common.js";
import { ObservabilityEventType } from "./notifications.js";
import { getErrorDetailFromException } from "./errors.js";
/**
* Observability sink can be passed into various operations (HTTP requests, DB access)
* to do structured logging within a particular context (task, request, ...).
*/
export interface ObservabilityContext {
observe(evt: ObservabilityEvent): void;
}
let seqId = 1000;
export class ObservableHttpClientLibrary implements HttpRequestLibrary {
private readonly cancelatorById = new Map<string, CancellationToken.Source>();
constructor(
private impl: HttpRequestLibrary,
private oc: ObservabilityContext,
) {}
public cancelRequest(id: string): void {
const cancelator = this.cancelatorById.get(id);
if (!cancelator) return;
cancelator.cancel();
}
async fetch(
url: string,
opt?: HttpRequestOptions | undefined,
): Promise<HttpResponse> {
const id = `req-${seqId}`;
seqId = seqId + 1;
const cancelator = CancellationToken.create();
if (opt?.cancellationToken) {
opt.cancellationToken.onCancelled(cancelator.cancel);
}
this.cancelatorById.set(id, cancelator);
this.oc.observe({
id,
when: AbsoluteTime.now(),
type: ObservabilityEventType.HttpFetchStart,
url: url,
});
const optsWithCancel = opt ?? {};
optsWithCancel.cancellationToken = cancelator.token;
try {
const res = await this.impl.fetch(url, optsWithCancel);
this.oc.observe({
id,
when: AbsoluteTime.now(),
type: ObservabilityEventType.HttpFetchFinishSuccess,
url,
status: res.status,
});
return res;
} catch (e) {
this.oc.observe({
id,
when: AbsoluteTime.now(),
type: ObservabilityEventType.HttpFetchFinishError,
url,
error: getErrorDetailFromException(e),
});
throw e;
} finally {
this.cancelatorById.delete(id);
}
}
}
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