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import { ComponentGetFailedError } from './errors';
import { StorageController } from './utils/StorageController';
export type Dependencies = Record<string, string>;
export interface Mismatches {
[dependency: string]: {
host: string;
component: string;
};
}
export type Issues = {
[component: string]: {
mismatches: Mismatches;
version: string;
};
};
export interface InitOptions {
prefix?: string;
url: string;
cache: Storage;
dependencies: {
versions: Dependencies;
resolvers: Record<string, any>;
};
fetcher?: GlobalFetch['fetch'];
globals?: Record<string, any>;
}
export interface Options {
componentVersion?: string;
ignoreCache?: boolean;
globals?: Record<string, any>;
}
interface RegisterHostResponse {
id: string;
issues: Issues;
}
const enum ReadyState {
NotInitialized,
Initializing,
Ready
}
export class DynamicoClient {
id: string = '';
url: string;
dependencies: {
versions: Dependencies;
resolvers: Record<string, any>;
};
cache: StorageController;
fetcher: GlobalFetch['fetch'];
globals: Record<string, any>;
private readyState: ReadyState = ReadyState.NotInitialized;
private requestQueue: Function[] = [];
constructor(options: InitOptions) {
this.url = options.url;
this.cache = new StorageController(options.prefix || '@dynamico', options.cache);
this.dependencies = options.dependencies;
this.globals = options.globals || {};
this.checkFetcher(options.fetcher);
this.fetcher = options.fetcher || fetch.bind(window);
}
private handleIssues(issues: Issues): void {
Object.entries(issues).forEach(([comp, { version, mismatches }]) =>
Object.entries(mismatches).forEach(([dependency, { host, component }]) =>
console.warn(
`${comp}@${version} requires ${dependency}@${component} but host provides ${host}. Please consider upgrade to version ${component}`
)
)
);
}
private checkFetcher(fetcher?: GlobalFetch['fetch']) {
if (!fetcher && typeof fetch === 'undefined') {
let library: string = 'unfetch';
Eif (typeof window === 'undefined') {
library = 'node-fetch';
}
throw new Error(`
fetch is not found globally and no fetcher passed, to fix pass a fetch for
your environment like https://www.npmjs.com/package/${library}.
`);
}
}
private filterMissingDependencies({ versions, resolvers }: DynamicoClient['dependencies']): Dependencies {
return Object.keys(resolvers).reduce((sum, name) => {
if (!versions[name]) {
console.warn(`Missing version specifier for ${name}`);
}
return {
...sum,
...(versions[name] ? { [name]: versions[name] } : undefined)
};
}, {});
}
private async register(dependencies: Dependencies) {
const url = buildUrl(this.url, {
path: '/host/register'
});
return await this.fetcher(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json'
},
body: JSON.stringify(dependencies)
}).then((res: Response) => res.json());
}
private async isReady() {
if (this.readyState === ReadyState.NotInitialized) {
this.readyState = ReadyState.Initializing;
await this.initialize();
this.readyState = ReadyState.Ready;
this.requestQueue.forEach(handler => handler());
this.requestQueue = [];
}
if (this.readyState !== ReadyState.Ready) {
await new Promise(resolve => this.requestQueue.push(() => resolve()));
}
return true;
}
private async fetchJs(name: string, { ignoreCache, componentVersion = undefined }: Options): Promise<string> {
await this.isReady();
let latestComponentVersion: string | undefined;
if (!componentVersion) {
latestComponentVersion = this.cache.getLatestVersion(name);
} else if (!ignoreCache && this.cache.has(name, componentVersion)) {
return (await this.cache.getItem(name, componentVersion)) as string;
}
const url = buildUrl(this.url, {
path: name,
queryParams: {
hostId: this.id,
...(componentVersion
? { componentVersion }
: latestComponentVersion && !ignoreCache && { latestComponentVersion })
}
});
const { statusCode, version, code } = await this.fetcher(url).then(async (res: Response) => {
if (!res.ok) {
throw new ComponentGetFailedError(res.statusText, res);
}
return {
statusCode: res.status,
version: res.headers.get('dynamico-component-version') as string,
code: await res.text()
};
});
if (statusCode === 204) {
return (await this.cache.getItem(name, version)) as string;
}
await this.cache.setItem(name, version, code);
return code;
}
private async initialize() {
const versions = this.filterMissingDependencies(this.dependencies);
const { id, issues }: RegisterHostResponse = await this.register(versions);
this.id = id;
this.handleIssues(issues);
}
async get(name: string, options: Options = {}) {
const code = await this.fetchJs(name, options);
const require = (dep: string) => this.dependencies.resolvers[dep];
const module: any = {};
const exports: any = {};
const args = {
module,
exports,
require,
...this.globals,
...options.globals
};
new Function(...Object.keys(args), code)(...Object.values(args));
if (module.exports) {
return module.exports;
}
return exports.default;
}
}
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