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/**
* @license
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import {getBaseUrl} from '../../../../utils/url-util';
import {CancelConditionCallback} from '../../../../services/gr-rest-api/gr-rest-api';
import {
AuthRequestInit,
AuthService,
} from '../../../../services/gr-auth/gr-auth';
import {
AccountDetailInfo,
EmailInfo,
ParsedJSON,
RequestPayload,
} from '../../../../types/common';
import {HttpMethod} from '../../../../constants/constants';
import {RpcLogEventDetail} from '../../../../types/events';
import {fireNetworkError, fireServerError} from '../../../../utils/event-util';
import {FetchRequest} from '../../../../types/types';
import {ErrorCallback} from '../../../../api/rest';
import {Scheduler, Task} from '../../../../services/scheduler/scheduler';
import {RetryError} from '../../../../services/scheduler/retry-scheduler';
export const JSON_PREFIX = ")]}'";
export interface ResponsePayload {
// TODO(TS): readResponsePayload can assign null to the parsed property if
// it can't parse input data. However polygerrit assumes in many places
// that the parsed property can't be null. We should update
// readResponsePayload method and reject a promise instead of assigning
// null to the parsed property
parsed: ParsedJSON; // Can be null!!! See comment above
raw: string;
}
export function readResponsePayload(
response: Response
): Promise<ResponsePayload> {
return response.text().then(text => {
let result;
try {
result = parsePrefixedJSON(text);
} catch (_) {
result = null;
}
// TODO(TS): readResponsePayload can assign null to the parsed property if
// it can't parse input data. However polygerrit assumes in many places
// that the parsed property can't be null. We should update
// readResponsePayload method and reject a promise instead of assigning
// null to the parsed property
return {parsed: result!, raw: text};
});
}
export function parsePrefixedJSON(jsonWithPrefix: string): ParsedJSON {
return JSON.parse(jsonWithPrefix.substring(JSON_PREFIX.length)) as ParsedJSON;
}
/**
* Wrapper around Map for caching server responses. Site-based so that
* changes to CANONICAL_PATH will result in a different cache going into
* effect.
*/
export class SiteBasedCache {
// TODO(TS): Type looks unusual. Fix it.
// Container of per-canonical-path caches.
private readonly data = new Map<
string | undefined,
unknown | Map<string, ParsedJSON | null>
>();
constructor() {
if (window.INITIAL_DATA) {
// Put all data shipped with index.html into the cache. This makes it
// so that we spare more round trips to the server when the app loads
// initially.
Object.entries(window.INITIAL_DATA).forEach(e =>
this._cache().set(e[0], e[1] as unknown as ParsedJSON)
);
}
}
// Returns the cache for the current canonical path.
_cache(): Map<string, unknown> {
if (!this.data.has(window.CANONICAL_PATH)) {
this.data.set(
window.CANONICAL_PATH,
new Map<string, ParsedJSON | null>()
);
}
return this.data.get(window.CANONICAL_PATH) as Map<
string,
ParsedJSON | null
>;
}
has(key: string) {
return this._cache().has(key);
}
get(key: '/accounts/self/emails'): EmailInfo[] | null;
get(key: '/accounts/self/detail'): AccountDetailInfo[] | null;
get(key: string): ParsedJSON | null;
get(key: string): unknown {
return this._cache().get(key);
}
set(key: '/accounts/self/emails', value: EmailInfo[]): void;
set(key: '/accounts/self/detail', value: AccountDetailInfo[]): void;
set(key: string, value: ParsedJSON | null): void;
set(key: string, value: unknown) {
this._cache().set(key, value);
}
delete(key: string) {
this._cache().delete(key);
}
invalidatePrefix(prefix: string) {
const newMap = new Map<string, unknown>();
for (const [key, value] of this._cache().entries()) {
if (!key.startsWith(prefix)) {
newMap.set(key, value);
}
}
this.data.set(window.CANONICAL_PATH, newMap);
}
}
type FetchPromisesCacheData = {
[url: string]: Promise<ParsedJSON | undefined> | undefined;
};
export class FetchPromisesCache {
private data: FetchPromisesCacheData;
constructor() {
this.data = {};
}
public testOnlyGetData() {
return this.data;
}
/**
* @return true only if a value for a key sets and it is not undefined
*/
has(key: string): boolean {
return !!this.data[key];
}
get(key: string) {
return this.data[key];
}
/**
* @param value a Promise to store in the cache. Pass undefined value to
* mark key as deleted.
*/
set(key: string, value: Promise<ParsedJSON | undefined> | undefined) {
this.data[key] = value;
}
invalidatePrefix(prefix: string) {
const newData: FetchPromisesCacheData = {};
Object.entries(this.data).forEach(([key, value]) => {
if (!key.startsWith(prefix)) {
newData[key] = value;
}
});
this.data = newData;
}
}
export type FetchParams = {
[name: string]: string[] | string | number | boolean | undefined | null;
};
interface SendRequestBase {
method: HttpMethod | undefined;
body?: RequestPayload;
contentType?: string;
headers?: Record<string, string>;
url: string;
reportUrlAsIs?: boolean;
anonymizedUrl?: string;
errFn?: ErrorCallback;
}
export interface SendRawRequest extends SendRequestBase {
parseResponse?: false | null;
}
export interface SendJSONRequest extends SendRequestBase {
parseResponse: true;
}
export type SendRequest = SendRawRequest | SendJSONRequest;
export interface FetchJSONRequest extends FetchRequest {
reportUrlAsIs?: boolean;
params?: FetchParams;
cancelCondition?: CancelConditionCallback;
errFn?: ErrorCallback;
}
// export function isRequestWithCancel<T extends FetchJSONRequest>(
// x: T
// ): x is T & RequestWithCancel {
// return !!(x as RequestWithCancel).cancelCondition;
// }
//
// export function isRequestWithErrFn<T extends FetchJSONRequest>(
// x: T
// ): x is T & RequestWithErrFn {
// return !!(x as RequestWithErrFn).errFn;
// }
export class GrRestApiHelper {
constructor(
private readonly _cache: SiteBasedCache,
private readonly _auth: AuthService,
private readonly _fetchPromisesCache: FetchPromisesCache,
private readonly readScheduler: Scheduler<Response>,
private readonly writeScheduler: Scheduler<Response>
) {}
private schedule(method: string, task: Task<Response>) {
if (method === 'PUT' || method === 'POST' || method === 'DELETE') {
return this.writeScheduler.schedule(task);
} else {
return this.readScheduler.schedule(task);
}
}
/**
* Wraps calls to the underlying authenticated fetch function (_auth.fetch)
* with timing and logging.
s */
fetch(req: FetchRequest): Promise<Response> {
const method =
req.fetchOptions && req.fetchOptions.method
? req.fetchOptions.method
: 'GET';
const start = Date.now();
const task = async () => {
const res = await this._auth.fetch(req.url, req.fetchOptions);
if (!res.ok && res.status === 429) throw new RetryError<Response>(res);
return res;
};
const xhr = this.schedule(method, task).catch((err: unknown) => {
if (err instanceof RetryError) {
return err.payload;
} else {
throw err;
}
});
// Log the call after it completes.
xhr.then(res => this._logCall(req, start, res ? res.status : null));
// Return the XHR directly (without the log).
return xhr;
}
/**
* Log information about a REST call. Because the elapsed time is determined
* by this method, it should be called immediately after the request
* finishes.
*
* @param startTime the time that the request was started.
* @param status the HTTP status of the response. The status value
* is used here rather than the response object so there is no way this
* method can read the body stream.
*/
private _logCall(
req: FetchRequest,
startTime: number,
status: number | null
) {
const method =
req.fetchOptions && req.fetchOptions.method
? req.fetchOptions.method
: 'GET';
const endTime = Date.now();
const elapsed = endTime - startTime;
const startAt = new Date(startTime);
const endAt = new Date(endTime);
console.info(
[
'HTTP',
status,
method,
`${elapsed}ms`,
req.anonymizedUrl || req.url,
`(${startAt.toISOString()}, ${endAt.toISOString()})`,
].join(' ')
);
if (req.anonymizedUrl) {
const detail: RpcLogEventDetail = {
status,
method,
elapsed,
anonymizedUrl: req.anonymizedUrl,
};
document.dispatchEvent(
new CustomEvent('gr-rpc-log', {
detail,
composed: true,
bubbles: true,
})
);
}
}
/**
* Fetch JSON from url provided.
* Returns a Promise that resolves to a native Response.
* Doesn't do error checking. Supports cancel condition. Performs auth.
* Validates auth expiry errors.
*
* @return Promise which resolves to undefined if cancelCondition returns true
* and resolves to Response otherwise
*/
fetchRawJSON(req: FetchJSONRequest): Promise<Response | undefined> {
const urlWithParams = this.urlWithParams(req.url, req.params);
const fetchReq: FetchRequest = {
url: urlWithParams,
fetchOptions: req.fetchOptions,
anonymizedUrl: req.reportUrlAsIs ? urlWithParams : req.anonymizedUrl,
};
return this.fetch(fetchReq)
.then((res: Response) => {
if (req.cancelCondition && req.cancelCondition()) {
if (res.body) {
res.body.cancel();
}
return;
}
return res;
})
.catch(err => {
if (req.errFn) {
req.errFn.call(undefined, null, err);
} else {
fireNetworkError(err);
}
throw err;
});
}
/**
* Fetch JSON from url provided.
* Returns a Promise that resolves to a parsed response.
* Same as {@link fetchRawJSON}, plus error handling.
*
* @param noAcceptHeader - don't add default accept json header
*/
fetchJSON(
req: FetchJSONRequest,
noAcceptHeader?: boolean
): Promise<ParsedJSON | undefined> {
if (!noAcceptHeader) {
req = this.addAcceptJsonHeader(req);
}
return this.fetchRawJSON(req).then(response => {
if (!response) {
return;
}
if (!response.ok) {
if (req.errFn) {
req.errFn.call(null, response);
return;
}
fireServerError(response, req);
return;
}
return this.getResponseObject(response);
});
}
urlWithParams(url: string, fetchParams?: FetchParams): string {
if (!fetchParams) {
return getBaseUrl() + url;
}
const params: Array<string | number | boolean> = [];
for (const [p, paramValue] of Object.entries(fetchParams)) {
// TODO(TS): Replace == null with === and check for null and undefined
// eslint-disable-next-line eqeqeq
if (paramValue == null) {
params.push(this.encodeRFC5987(p));
continue;
}
// TODO(TS): Unclear, why do we need the following code.
// If paramValue can be array - we should either fix FetchParams type
// or convert the array to a string before calling urlWithParams method.
const paramValueAsArray = ([] as Array<string | number | boolean>).concat(
paramValue
);
for (const value of paramValueAsArray) {
params.push(`${this.encodeRFC5987(p)}=${this.encodeRFC5987(value)}`);
}
}
return getBaseUrl() + url + '?' + params.join('&');
}
// Backend encode url in RFC5987 and frontend needs to do same to match
// queries for preloading queries
encodeRFC5987(uri: string | number | boolean) {
return encodeURIComponent(uri).replace(
/['()*]/g,
c => '%' + c.charCodeAt(0).toString(16)
);
}
getResponseObject(response: Response): Promise<ParsedJSON> {
return readResponsePayload(response).then(payload => payload.parsed);
}
addAcceptJsonHeader(req: FetchJSONRequest) {
if (!req.fetchOptions) req.fetchOptions = {};
if (!req.fetchOptions.headers) req.fetchOptions.headers = new Headers();
if (!req.fetchOptions.headers.has('Accept')) {
req.fetchOptions.headers.append('Accept', 'application/json');
}
return req;
}
fetchCacheURL(req: FetchJSONRequest): Promise<ParsedJSON | undefined> {
if (this._fetchPromisesCache.has(req.url)) {
return this._fetchPromisesCache.get(req.url)!;
}
// TODO(andybons): Periodic cache invalidation.
if (this._cache.has(req.url)) {
return Promise.resolve(this._cache.get(req.url)!);
}
this._fetchPromisesCache.set(
req.url,
this.fetchJSON(req)
.then(response => {
if (response !== undefined) {
this._cache.set(req.url, response);
}
this._fetchPromisesCache.set(req.url, undefined);
return response;
})
.catch(err => {
this._fetchPromisesCache.set(req.url, undefined);
throw err;
})
);
return this._fetchPromisesCache.get(req.url)!;
}
// if errFn is not set, then only Response possible
send(req: SendRawRequest & {errFn?: undefined}): Promise<Response>;
send(req: SendRawRequest): Promise<Response | undefined>;
send(req: SendJSONRequest): Promise<ParsedJSON>;
send(req: SendRequest): Promise<Response | ParsedJSON | undefined>;
/**
* Send an XHR.
*
* @return Promise resolves to Response/ParsedJSON only if the request is successful
* (i.e. no exception and response.ok is true). If response fails then
* promise resolves either to void if errFn is set or rejects if errFn
* is not set */
send(req: SendRequest): Promise<Response | ParsedJSON | undefined> {
const options: AuthRequestInit = {method: req.method};
if (req.body) {
options.headers = new Headers();
options.headers.set(
'Content-Type',
req.contentType || 'application/json'
);
options.body =
typeof req.body === 'string' ? req.body : JSON.stringify(req.body);
}
if (req.headers) {
if (!options.headers) {
options.headers = new Headers();
}
for (const [name, value] of Object.entries(req.headers)) {
options.headers.set(name, value);
}
}
const url = req.url.startsWith('http') ? req.url : getBaseUrl() + req.url;
const fetchReq: FetchRequest = {
url,
fetchOptions: options,
anonymizedUrl: req.reportUrlAsIs ? url : req.anonymizedUrl,
};
const xhr = this.fetch(fetchReq)
.catch(err => {
fireNetworkError(err);
if (req.errFn) {
return req.errFn.call(undefined, null, err);
} else {
throw err;
}
})
.then(response => {
if (response && !response.ok) {
if (req.errFn) {
req.errFn.call(undefined, response);
return;
}
fireServerError(response, fetchReq);
}
return response;
});
if (req.parseResponse) {
// TODO(TS): remove as Response and fix error.
// Javascript code allows returning of a Response object from errFn.
// This can be a mistake and we should add check here or it can be used
// somewhere - in this case we should fix it carefully (define
// different type of callback if parseResponse is true, etc...).
return xhr.then(res => this.getResponseObject(res as Response));
}
// The actual xhr type is Promise<Response|undefined|void> because of the
// catch callback
return xhr as Promise<Response | undefined>;
}
invalidateFetchPromisesPrefix(prefix: string) {
this._fetchPromisesCache.invalidatePrefix(prefix);
this._cache.invalidatePrefix(prefix);
}
}