91 lines
2.6 KiB
TypeScript
91 lines
2.6 KiB
TypeScript
import { Manifest, RuntimeEnvironment } from "./types.ts";
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import { Sandbox } from "./sandbox.ts";
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import { System } from "./system.ts";
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import { AssetBundle, AssetJson } from "./asset_bundle/bundle.ts";
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export class Plug<HookT> {
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system: System<HookT>;
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sandbox: Sandbox;
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public manifest?: Manifest<HookT>;
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public assets?: AssetBundle;
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readonly runtimeEnv: RuntimeEnvironment;
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grantedPermissions: string[] = [];
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name: string;
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version: number;
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constructor(
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system: System<HookT>,
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name: string,
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sandboxFactory: (plug: Plug<HookT>) => Sandbox,
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) {
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this.system = system;
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this.name = name;
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this.sandbox = sandboxFactory(this);
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this.runtimeEnv = system.runtimeEnv;
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this.version = new Date().getTime();
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}
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async load(manifest: Manifest<HookT>) {
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this.manifest = manifest;
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this.assets = new AssetBundle(
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manifest.assets ? manifest.assets as AssetJson : {},
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);
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// TODO: These need to be explicitly granted, not just taken
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this.grantedPermissions = manifest.requiredPermissions || [];
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for (const [dep, code] of Object.entries(manifest.dependencies || {})) {
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await this.sandbox.loadDependency(dep, code);
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}
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}
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syscall(name: string, args: any[]): Promise<any> {
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return this.system.syscallWithContext({ plug: this }, name, args);
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}
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canInvoke(name: string) {
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if (!this.manifest) {
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return false;
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}
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const funDef = this.manifest.functions[name];
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if (!funDef) {
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throw new Error(`Function ${name} not found in manifest`);
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}
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return !funDef.env || funDef.env === this.runtimeEnv;
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}
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async invoke(name: string, args: any[]): Promise<any> {
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const funDef = this.manifest!.functions[name];
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if (!funDef) {
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throw new Error(`Function ${name} not found in manifest`);
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}
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if (funDef.redirect) {
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// Function redirect, look up
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// deno-lint-ignore no-this-alias
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let plug: Plug<HookT> | undefined = this;
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if (funDef.redirect.indexOf(".") !== -1) {
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const [plugName, functionName] = funDef.redirect.split(".");
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plug = this.system.loadedPlugs.get(plugName);
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if (!plug) {
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throw Error(`Plug ${plugName} redirected to not found`);
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}
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name = functionName;
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} else {
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name = funDef.redirect;
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}
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return plug.invoke(name, args);
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}
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if (!this.sandbox.isLoaded(name)) {
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if (!this.canInvoke(name)) {
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throw new Error(
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`Function ${name} is not available in ${this.runtimeEnv}`,
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);
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}
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await this.sandbox.load(name, funDef.code!);
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}
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return await this.sandbox.invoke(name, args);
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}
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stop() {
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this.sandbox.stop();
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}
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}
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