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ServiceBase.ts
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ServiceBase.ts
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import localforage from 'localforage';
import { keyBy, memoize } from 'lodash';
import * as QueryString from 'querystring';
import { v4 as uuid } from 'uuid';
import { expandedRecordClassDecoder } from '../Service/Decoders/RecordClassDecoders';
import {
DelayedResultError,
isDelayedResultError,
} from '../Service/DelayedResultError';
import { ServiceError, isServerError } from '../Service/ServiceError';
import { fetchWithRetry } from '../Utils/FetchWithRetry';
import * as Decode from '../Utils/Json';
import { alert } from '../Utils/Platform';
import { pendingPromise } from '../Utils/PromiseUtils';
import { Question } from '../Utils/WdkModel';
import { appendUrlAndRethrow, makeTraceid } from './ServiceUtils';
/**
* Header added to service requests to indicate the version of the model
* current stored in cache.
*/
export const CLIENT_WDK_VERSION_HEADER = 'x-client-wdk-timestamp';
/**
* Response text returned by service that indicates the version of the cached
* model is stale, based on CLIENT_WDK_VERSION_HEADER.
*/
export const CLIENT_OUT_OF_SYNC_TEXT = 'WDK-TIMESTAMP-MISMATCH';
/**
* Response returned by service that indicates that the requested
* resource is not yet available.
*/
export type DelayedResult = Decode.Unpack<typeof delayedResult>;
const delayedResult = Decode.record({
status: Decode.constant('accepted'),
message: Decode.constant('WDK-DELAYED-RESULT'),
});
export interface StandardWdkPostResponse {
id: number;
}
type RequestOptions<Resource> = {
/** Request method */
method: string;
/** Path to the resource, relative to the base url */
path: string;
/** Query params to include with request */
params?: { [key: string]: any };
/** Request body */
body?: string;
/** Fetch from cache, if available */
useCache?: boolean;
/**
* Optional identity for cache. If useCache is true, and this is omitted, then
* a combination of the resource path and any provided params will be used as
* the cache key. If this is also included, this value will be appended to the
* generated cache key.
*/
cacheId?: string;
/** If using cache and a value is present, this is a check for the cached value */
checkCachedValue?: (resource: Resource) => boolean;
};
export interface ServiceConfig {
authentication: {
method: 'OAUTH2' | 'USER_DB';
oauthUrl: string;
oauthClientUrl: string;
oauthClientId: string;
};
buildNumber: string;
categoriesOntologyName: string;
description: string;
displayName: string;
projectId: string;
releaseDate: string;
startupTime: number;
userProfileProperties: Array<{
name: string;
displayName: string;
isRequired: boolean;
isMultiLine: boolean;
isPublic: boolean;
}>;
}
const configDecoder: Decode.Decoder<ServiceConfig> = Decode.record({
authentication: Decode.record({
method: Decode.oneOf(Decode.constant('OAUTH2'), Decode.constant('USER_DB')),
oauthUrl: Decode.string,
oauthClientUrl: Decode.string,
oauthClientId: Decode.string,
}),
buildNumber: Decode.string,
categoriesOntologyName: Decode.string,
description: Decode.string,
displayName: Decode.string,
projectId: Decode.string,
releaseDate: Decode.string,
startupTime: Decode.number,
userProfileProperties: Decode.arrayOf(
Decode.record({
name: Decode.string,
displayName: Decode.string,
isRequired: Decode.boolean,
isMultiLine: Decode.boolean,
isPublic: Decode.boolean,
})
),
});
export type ServiceBase = ReturnType<typeof ServiceBase>;
/**
* A helper to request resources from a Wdk REST Service.
* @param {string} serviceUrl Base url for Wdk REST Service.
*/
export const ServiceBase = (serviceUrl: string) => {
const _store: LocalForage = localforage.createInstance({
name: 'WdkService/' + serviceUrl,
});
const _cache: Map<string, Promise<any>> = new Map();
let _initialCheck: Promise<number> | undefined;
let _version: number | undefined;
let _isInvalidating = false;
/**
* Get the configuration for the Wdk REST Service that resides at the given base url.
*/
function getConfig(): Promise<ServiceConfig> {
return sendRequest(configDecoder, {
method: 'get',
path: '/',
useCache: true,
cacheId: 'config',
});
}
/**
* Send a request to a resource of the Wdk REST Service, and returns a Promise
* that will fulfill with the response, or reject with a ServiceError.
*
* @param options Options for request.
* @param options.method The request method to use.
* @param options.path The path of the resource, relative to the root url.
* @param options.params? Query params to include with request.
* @param options.body? The request body
* @param options.useCache? Indicate if resource should be fetched from cache.
* This cache is invalidated whenever the REST Service application is restarted.
* The resource's url and any query params are used to generate a cache key.
* @param options.cacheId? Additional string to use for cache key. This is useful
* for POST requests that are semantically treated as GET requests.
* @param options.checkCachedValue? If present this function is called on a cached value,
* which is then only returned if the call returns true.
* @return {Promise<Resource>}
*/
function sendRequest<Resource>(
decoder: Decode.Decoder<Resource>,
options: RequestOptions<Resource>
): Promise<Resource> {
let { method, path, params, body, useCache, cacheId, checkCachedValue } =
options;
method = method.toUpperCase();
let url =
path + (params == null ? '' : '?' + QueryString.stringify(params));
// Technically, only GET should be cache-able, but some resources treat POST
// as GET, so we will allow it.
if (useCache && (method === 'GET' || method === 'POST')) {
let cacheKey = url + (cacheId == null ? '' : '__' + cacheId);
return _getFromCache(
cacheKey,
() => sendRequest(decoder, { ...options, useCache: false }),
checkCachedValue
);
}
return _fetchJson(method, url, body).then((resp) => {
const result = decoder(resp);
if (result.status === 'ok') return result.value;
// This is an error we always want to submit to service. Typically,
// WdkService consumers will catch errors and show a message to users
// that something went wrong. We want to make sure that this error also
// makes it to the client error log on the server.
let errorMessage = `Could not decode resource from ${options.path}:`;
if (result.context) {
errorMessage += '\n\n' + ` Problem at _${result.context}:`;
}
errorMessage +=
'\n\n' +
` Expected ${result.expected}, but got ${JSON.stringify(
result.value
)}.`;
const err = Error(errorMessage);
submitError(err);
console.error(err);
throw err;
});
}
function submitError(error: Error, extra?: any) {
const { name, message, stack } = error;
console.group('Client error log');
console.error(error);
console.groupEnd();
return _checkStoreVersion().then(() =>
sendRequest(Decode.none, {
method: 'post',
path: '/client-errors',
body: JSON.stringify({ name, message, stack, extra }),
})
);
}
async function submitErrorIfNot500(error: Error, extra?: any): Promise<void> {
if (isServerError(error)) return;
return submitError(error, extra);
}
async function submitErrorIfUndelayedAndNot500(
error: Error,
extra?: any
): Promise<void> {
if (isDelayedResultError(error)) return;
return submitErrorIfNot500(error, extra);
}
function _fetchJson<T>(
method: string,
url: string,
body?: string,
isBaseUrl?: boolean
) {
const headers = new Headers({
'Content-Type': 'application/json',
traceid: makeTraceid(),
});
if (_version) headers.append(CLIENT_WDK_VERSION_HEADER, String(_version));
return fetchWithRetry(1, isBaseUrl ? url : serviceUrl + url, {
headers,
method: method.toUpperCase(),
body: body,
credentials: 'include',
})
.then((response) => {
if (_isInvalidating) {
return pendingPromise as Promise<T>;
}
if (response.ok) {
if (response.status === 204) {
return undefined;
}
return response.json().then((json) => {
const delayedResultValidation = delayedResult(json);
// If the response is that of a delayed result, throw a DelayedResultError
if (delayedResultValidation.status === 'ok') {
throw new DelayedResultError(
'We are still processing your result. Please return to this page later.',
response.headers.get('x-log-marker') ?? uuid()
);
}
// Otherwise, return the parsed JSON as-is for further processing
return json;
});
}
return response.text().then((text) => {
if (response.status === 409 && text === CLIENT_OUT_OF_SYNC_TEXT) {
_isInvalidating = true;
Promise.all([
_store.clear(),
alert(
'Reload Page',
'This page is no longer valid and will be reloaded.'
),
]).then(() => location.reload(true));
return pendingPromise as Promise<T>;
}
// FIXME Get uuid from response header when available
throw new ServiceError(
`Cannot ${method.toUpperCase()} ${url} (${response.status})`,
text,
response.status,
response.headers.get('x-log-marker') || uuid()
);
});
})
.catch(appendUrlAndRethrow(serviceUrl + url)) as Promise<T>;
}
/**
* Checks cache for item associated to key. If item is not in cache, then
* call onCacheMiss callback and set the resolved value in the cache.
*/
function _getFromCache<T>(
key: string,
onCacheMiss: () => Promise<T>,
checkCachedValue = (cachedValue: T) => true
) {
if (!_cache.has(key)) {
let cacheValue$ = _checkStoreVersion()
.then(() => _store.getItem<T>(key))
.then((storeItem) => {
if (storeItem != null && checkCachedValue(storeItem))
return storeItem;
return onCacheMiss().then((item) => {
return _store.setItem(key, item).catch((err) => {
console.error(
'Unable to store WdkService item with key `' + key + '`.',
err
);
return item;
});
});
});
_cache.set(key, cacheValue$);
}
return <Promise<T>>_cache.get(key);
}
function _checkStoreVersion() {
if (_initialCheck == null) {
let serviceConfig$ = _fetchJson<ServiceConfig>('get', '/');
let storeConfig$ = _store.getItem<ServiceConfig>('config');
_initialCheck = Promise.all([serviceConfig$, storeConfig$] as const)
.then(([serviceConfig, storeConfig]) => {
if (
storeConfig == null ||
storeConfig.startupTime != serviceConfig.startupTime
) {
return _store.clear().then(() => {
return _store.setItem('config', serviceConfig).catch((err) => {
console.error(
'Unable to store WdkService item with key `config`.',
err
);
return serviceConfig;
});
});
}
return serviceConfig;
})
.then((serviceConfig) => {
_version = serviceConfig.startupTime;
return _version;
});
}
return _initialCheck;
}
function _clearCache() {
return _store.clear();
}
function getVersion() {
return _checkStoreVersion();
}
function getRecordTypesPath() {
return '/record-types';
}
function getRecordTypePath(recordClassUrlSegment: string) {
return getRecordTypesPath() + '/' + recordClassUrlSegment;
}
function getSearchesPath(recordClassUrlSegment: string) {
return getRecordTypePath(recordClassUrlSegment) + '/searches';
}
function getSearchPath(
recordClassUrlSegment: string,
questionUrlSegment: string
) {
return getSearchesPath(recordClassUrlSegment) + '/' + questionUrlSegment;
}
function getReportsPath(
recordClassUrlSegment: string,
questionUrlSegment: string
) {
return getSearchesPath(recordClassUrlSegment) + '/' + questionUrlSegment;
}
function getReportsEndpoint(
recordClassUrlSegment: string,
questionUrlSegment: string
) {
return getReportsPath(recordClassUrlSegment, questionUrlSegment);
}
function getStandardSearchReportEndpoint(
recordClassUrlSegment: string,
questionUrlSegment: string
) {
return (
getReportsEndpoint(recordClassUrlSegment, questionUrlSegment) +
'/reports/standard'
);
}
function getCustomSearchReportEndpoint(
recordClassUrlSegment: string,
questionUrlSegment: string,
reportName: string
) {
return (
getReportsEndpoint(recordClassUrlSegment, questionUrlSegment) +
'/reports/' +
reportName
);
}
const getRecordClasses = memoize(async function getRecordClasses() {
const decoder = Decode.arrayOf(expandedRecordClassDecoder);
const recordClasses = await sendRequest(decoder, {
method: 'get',
path: '/record-types',
params: { format: 'expanded' },
useCache: true,
cacheId: 'records',
});
// create indexes by name property for attributes and tables
// this is done after recordClasses have been retrieved from the store
// since it cannot reliably serialize Maps
return recordClasses.map((recordClass) =>
Object.assign(recordClass, {
attributesMap: keyBy(recordClass.attributes, 'name'),
tablesMap: keyBy(recordClass.tables, 'name'),
})
);
});
function getQuestions(): Promise<Array<Question>> {
return getRecordClasses().then((result) => {
return result.reduce(
(arr, rc) => arr.concat(rc.searches),
[] as Array<Question>
);
});
}
function findQuestion(urlSegment: string) {
return getQuestions().then((qs) => {
let question = qs.find((q) => q.urlSegment === urlSegment);
if (question == null) {
throw new ServiceError(
`Could not find question "${urlSegment}".`,
'Not found',
404,
uuid()
);
}
return question;
});
}
function findRecordClass(urlSegment: string) {
return getRecordClasses().then((rs) => {
let record = rs.find((r) => r.urlSegment === urlSegment);
if (record == null) {
throw new ServiceError(
`Could not find record class "${urlSegment}".`,
'Not found',
404,
uuid()
);
}
return record;
});
}
return {
_version,
_fetchJson,
_getFromCache,
_clearCache,
serviceUrl,
sendRequest,
submitError,
submitErrorIfNot500,
submitErrorIfUndelayedAndNot500,
getConfig,
getVersion,
getRecordClasses,
findRecordClass,
getQuestions,
findQuestion,
getRecordTypePath,
getRecordTypesPath,
getReportsEndpoint,
getReportsPath,
getSearchesPath,
getSearchPath,
getStandardSearchReportEndpoint,
getCustomSearchReportEndpoint,
};
};