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import { Injectable } from '@angular/core'
import { Router } from '@angular/router'
import { ServerConfigPlugin } from '@shared/models'
import { ServerService } from '@app/core/server/server.service'
import { ClientScript } from '@shared/models/plugins/plugin-package-json.model'
import { PluginScope } from '@shared/models/plugins/plugin-scope.type'
import { environment } from '../../../environments/environment'
import { RegisterHookOptions } from '@shared/models/plugins/register.model'
import { ReplaySubject } from 'rxjs'
import { first } from 'rxjs/operators'
interface HookStructValue extends RegisterHookOptions {
plugin: ServerConfigPlugin
clientScript: ClientScript
}
@Injectable()
export class PluginService {
pluginsLoaded = new ReplaySubject<boolean>(1)
private plugins: ServerConfigPlugin[] = []
private scopes: { [ scopeName: string ]: { plugin: ServerConfigPlugin, clientScript: ClientScript }[] } = {}
private loadedScripts: { [ script: string ]: boolean } = {}
private hooks: { [ name: string ]: HookStructValue[] } = {}
constructor (
private router: Router,
private server: ServerService
) {
}
initializePlugins () {
this.server.configLoaded
.subscribe(() => {
this.plugins = this.server.getConfig().plugin.registered
this.buildScopeStruct()
this.pluginsLoaded.next(true)
})
}
ensurePluginsAreLoaded () {
return this.pluginsLoaded.asObservable()
.pipe(first())
.toPromise()
}
async loadPluginsByScope (scope: PluginScope) {
try {
await this.ensurePluginsAreLoaded()
const toLoad = this.scopes[ scope ]
if (!Array.isArray(toLoad)) return
const promises: Promise<any>[] = []
for (const { plugin, clientScript } of toLoad) {
if (this.loadedScripts[ clientScript.script ]) continue
promises.push(this.loadPlugin(plugin, clientScript))
this.loadedScripts[ clientScript.script ] = true
}
return Promise.all(promises)
} catch (err) {
console.error('Cannot load plugins by scope %s.', scope, err)
}
}
async runHook (hookName: string, param?: any) {
let result = param
const wait = hookName.startsWith('static:')
for (const hook of this.hooks[hookName]) {
try {
if (wait) result = await hook.handler(param)
else result = hook.handler()
} catch (err) {
console.error('Cannot run hook %s of script %s of plugin %s.', hookName, hook.plugin, hook.clientScript, err)
}
}
return result
}
private loadPlugin (plugin: ServerConfigPlugin, clientScript: ClientScript) {
const registerHook = (options: RegisterHookOptions) => {
if (!this.hooks[options.target]) this.hooks[options.target] = []
this.hooks[options.target].push({
plugin,
clientScript,
target: options.target,
handler: options.handler,
priority: options.priority || 0
})
}
console.log('Loading script %s of plugin %s.', clientScript.script, plugin.name)
const url = environment.apiUrl + `/plugins/${plugin.name}/${plugin.version}/client-scripts/${clientScript.script}`
return import(/* webpackIgnore: true */ url)
.then(script => script.register({ registerHook }))
.then(() => this.sortHooksByPriority())
}
private buildScopeStruct () {
for (const plugin of this.plugins) {
for (const key of Object.keys(plugin.clientScripts)) {
const clientScript = plugin.clientScripts[key]
for (const scope of clientScript.scopes) {
if (!this.scopes[scope]) this.scopes[scope] = []
this.scopes[scope].push({
plugin,
clientScript
})
this.loadedScripts[clientScript.script] = false
}
}
}
}
private sortHooksByPriority () {
for (const hookName of Object.keys(this.hooks)) {
this.hooks[hookName].sort((a, b) => {
return b.priority - a.priority
})
}
}
}
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