105 lines
2.9 KiB
TypeScript
105 lines
2.9 KiB
TypeScript
import type { Hook, Manifest } from "../types.ts";
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import { System } from "../system.ts";
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import { safeRun } from "../util.ts";
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// System events:
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// - plug:load (plugName: string)
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export type EventHookT = {
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events?: string[];
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};
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export class EventHook implements Hook<EventHookT> {
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private system?: System<EventHookT>;
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public localListeners: Map<string, ((data: any) => any)[]> = new Map();
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addLocalListener(eventName: string, callback: (data: any) => any) {
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if (!this.localListeners.has(eventName)) {
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this.localListeners.set(eventName, []);
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}
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this.localListeners.get(eventName)!.push(callback);
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}
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// Pull all events listened to
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listEvents(): string[] {
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if (!this.system) {
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throw new Error("Event hook is not initialized");
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}
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const eventNames = new Set<string>();
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for (const plug of this.system.loadedPlugs.values()) {
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for (const functionDef of Object.values(plug.manifest!.functions)) {
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if (functionDef.events) {
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for (const eventName of functionDef.events) {
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eventNames.add(eventName);
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}
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}
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}
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}
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for (const eventName of this.localListeners.keys()) {
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eventNames.add(eventName);
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}
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return [...eventNames];
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}
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async dispatchEvent(eventName: string, data?: any): Promise<any[]> {
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if (!this.system) {
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throw new Error("Event hook is not initialized");
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}
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const responses: any[] = [];
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for (const plug of this.system.loadedPlugs.values()) {
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for (
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const [name, functionDef] of Object.entries(
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plug.manifest!.functions,
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)
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) {
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if (functionDef.events && functionDef.events.includes(eventName)) {
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// Only dispatch functions that can run in this environment
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if (plug.canInvoke(name)) {
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const result = await plug.invoke(name, [data]);
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if (result !== undefined) {
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responses.push(result);
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}
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}
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}
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}
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}
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const localListeners = this.localListeners.get(eventName);
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if (localListeners) {
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for (const localListener of localListeners) {
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const result = await Promise.resolve(localListener(data));
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if (result) {
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responses.push(result);
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}
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}
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}
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return responses;
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}
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apply(system: System<EventHookT>): void {
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this.system = system;
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this.system.on({
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plugLoaded: (plug) => {
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safeRun(async () => {
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await this.dispatchEvent("plug:load", plug.name);
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});
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},
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});
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}
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validateManifest(manifest: Manifest<EventHookT>): string[] {
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const errors = [];
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for (
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const [_, functionDef] of Object.entries(
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manifest.functions || {},
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)
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) {
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if (functionDef.events && !Array.isArray(functionDef.events)) {
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errors.push("'events' key must be an array of strings");
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}
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}
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return errors;
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}
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}
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