Add support for view engines, PNPM

package-lock.json

@@ -4,6 +4,26 @@
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 }

package.json

@@ -11,8 +11,10 @@
     "@extollo/di": "file:../di",
     "@extollo/util": "file:../util",
     "@types/negotiator": "^0.6.1",
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pnpm-lock.yaml

@@ -0,0 +1,321 @@
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+  typescript: 4.2.3
+lockfileVersion: 5.2
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+      lodash: 4.17.21
+      to-fast-properties: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-hE+HE8rnG1Z6Wzo+MhaKE5lM5eMx71T4EHJgku2E3xIfaULhDcxiiRxUYgwX8qwP1BBSlag+TdGOt6JAidIZTA==
+  /@types/negotiator/0.6.1:
+    dev: false
+    resolution:
+      integrity: sha512-c4mvXFByghezQ/eVGN5HvH/jI63vm3B7FiE81BUzDAWmuiohRecCO6ddU60dfq29oKUMiQujsoB2h0JQC7JHKA==
+  /@types/pug/2.0.4:
+    dev: false
+    resolution:
+      integrity: sha1-h3L80EGOPNLMFxVV1zAHQVBR9LI=
+  /acorn/7.4.1:
+    dev: false
+    engines:
+      node: '>=0.4.0'
+    hasBin: true
+    resolution:
+      integrity: sha512-nQyp0o1/mNdbTO1PO6kHkwSrmgZ0MT/jCCpNiwbUjGoRN4dlBhqJtoQuCnEOKzgTVwg0ZWiCoQy6SxMebQVh8A==
+  /asap/2.0.6:
+    dev: false
+    resolution:
+      integrity: sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=
+  /assert-never/1.2.1:
+    dev: false
+    resolution:
+      integrity: sha512-TaTivMB6pYI1kXwrFlEhLeGfOqoDNdTxjCdwRfFFkEA30Eu+k48W34nlok2EYWJfFFzqaEmichdNM7th6M5HNw==
+  /babel-walk/3.0.0-canary-5:
+    dependencies:
+      '@babel/types': 7.13.0
+    dev: false
+    engines:
+      node: '>= 10.0.0'
+    resolution:
+      integrity: sha512-GAwkz0AihzY5bkwIY5QDR+LvsRQgB/B+1foMPvi0FZPMl5fjD7ICiznUiBdLYMH1QYe6vqu4gWYytZOccLouFw==
+  /call-bind/1.0.2:
+    dependencies:
+      function-bind: 1.1.1
+      get-intrinsic: 1.1.1
+    dev: false
+    resolution:
+      integrity: sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==
+  /character-parser/2.2.0:
+    dependencies:
+      is-regex: 1.1.2
+    dev: false
+    resolution:
+      integrity: sha1-x84o821LzZdE5f/CxfzeHHMmH8A=
+  /constantinople/4.0.1:
+    dependencies:
+      '@babel/parser': 7.13.10
+      '@babel/types': 7.13.0
+    dev: false
+    resolution:
+      integrity: sha512-vCrqcSIq4//Gx74TXXCGnHpulY1dskqLTFGDmhrGxzeXL8lF8kvXv6mpNWlJj1uD4DW23D4ljAqbY4RRaaUZIw==
+  /doctypes/1.1.0:
+    dev: false
+    resolution:
+      integrity: sha1-6oCxBqh1OHdOijpKWv4pPeSJ4Kk=
+  /dotenv/8.2.0:
+    dev: false
+    engines:
+      node: '>=8'
+    resolution:
+      integrity: sha512-8sJ78ElpbDJBHNeBzUbUVLsqKdccaa/BXF1uPTw3GrvQTBgrQrtObr2mUrE38vzYd8cEv+m/JBfDLioYcfXoaw==
+  /function-bind/1.1.1:
+    dev: false
+    resolution:
+      integrity: sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==
+  /get-intrinsic/1.1.1:
+    dependencies:
+      function-bind: 1.1.1
+      has: 1.0.3
+      has-symbols: 1.0.2
+    dev: false
+    resolution:
+      integrity: sha512-kWZrnVM42QCiEA2Ig1bG8zjoIMOgxWwYCEeNdwY6Tv/cOSeGpcoX4pXHfKUxNKVoArnrEr2e9srnAxxGIraS9Q==
+  /has-symbols/1.0.2:
+    dev: false
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-chXa79rL/UC2KlX17jo3vRGz0azaWEx5tGqZg5pO3NUyEJVB17dMruQlzCCOfUvElghKcm5194+BCRvi2Rv/Gw==
+  /has/1.0.3:
+    dependencies:
+      function-bind: 1.1.1
+    dev: false
+    engines:
+      node: '>= 0.4.0'
+    resolution:
+      integrity: sha512-f2dvO0VU6Oej7RkWJGrehjbzMAjFp5/VKPp5tTpWIV4JHHZK1/BxbFRtf/siA2SWTe09caDmVtYYzWEIbBS4zw==
+  /is-core-module/2.2.0:
+    dependencies:
+      has: 1.0.3
+    dev: false
+    resolution:
+      integrity: sha512-XRAfAdyyY5F5cOXn7hYQDqh2Xmii+DEfIcQGxK/uNwMHhIkPWO0g8msXcbzLe+MpGoR951MlqM/2iIlU4vKDdQ==
+  /is-expression/4.0.0:
+    dependencies:
+      acorn: 7.4.1
+      object-assign: 4.1.1
+    dev: false
+    resolution:
+      integrity: sha512-zMIXX63sxzG3XrkHkrAPvm/OVZVSCPNkwMHU8oTX7/U3AL78I0QXCEICXUM13BIa8TYGZ68PiTKfQz3yaTNr4A==
+  /is-promise/2.2.2:
+    dev: false
+    resolution:
+      integrity: sha512-+lP4/6lKUBfQjZ2pdxThZvLUAafmZb8OAxFb8XXtiQmS35INgr85hdOGoEs124ez1FCnZJt6jau/T+alh58QFQ==
+  /is-regex/1.1.2:
+    dependencies:
+      call-bind: 1.0.2
+      has-symbols: 1.0.2
+    dev: false
+    engines:
+      node: '>= 0.4'
+    resolution:
+      integrity: sha512-axvdhb5pdhEVThqJzYXwMlVuZwC+FF2DpcOhTS+y/8jVq4trxyPgfcwIxIKiyeuLlSQYKkmUaPQJ8ZE4yNKXDg==
+  /js-stringify/1.0.2:
+    dev: false
+    resolution:
+      integrity: sha1-Fzb939lyTyijaCrcYjCufk6Weds=
+  /jstransformer/1.0.0:
+    dependencies:
+      is-promise: 2.2.2
+      promise: 7.3.1
+    dev: false
+    resolution:
+      integrity: sha1-7Yvwkh4vPx7U1cGkT2hwntJHIsM=
+  /lodash/4.17.21:
+    dev: false
+    resolution:
+      integrity: sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+  /negotiator/0.6.2:
+    dev: false
+    engines:
+      node: '>= 0.6'
+    resolution:
+      integrity: sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
+  /object-assign/4.1.1:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
+  /path-parse/1.0.6:
+    dev: false
+    resolution:
+      integrity: sha512-GSmOT2EbHrINBf9SR7CDELwlJ8AENk3Qn7OikK4nFYAu3Ote2+JYNVvkpAEQm3/TLNEJFD/xZJjzyxg3KBWOzw==
+  /promise/7.3.1:
+    dependencies:
+      asap: 2.0.6
+    dev: false
+    resolution:
+      integrity: sha512-nolQXZ/4L+bP/UGlkfaIujX9BKxGwmQ9OT4mOt5yvy8iK1h3wqTEJCijzGANTCCl9nWjY41juyAn2K3Q1hLLTg==
+  /pug-attrs/3.0.0:
+    dependencies:
+      constantinople: 4.0.1
+      js-stringify: 1.0.2
+      pug-runtime: 3.0.1
+    dev: false
+    resolution:
+      integrity: sha512-azINV9dUtzPMFQktvTXciNAfAuVh/L/JCl0vtPCwvOA21uZrC08K/UnmrL+SXGEVc1FwzjW62+xw5S/uaLj6cA==
+  /pug-code-gen/3.0.2:
+    dependencies:
+      constantinople: 4.0.1
+      doctypes: 1.1.0
+      js-stringify: 1.0.2
+      pug-attrs: 3.0.0
+      pug-error: 2.0.0
+      pug-runtime: 3.0.1
+      void-elements: 3.1.0
+      with: 7.0.2
+    dev: false
+    resolution:
+      integrity: sha512-nJMhW16MbiGRiyR4miDTQMRWDgKplnHyeLvioEJYbk1RsPI3FuA3saEP8uwnTb2nTJEKBU90NFVWJBk4OU5qyg==
+  /pug-error/2.0.0:
+    dev: false
+    resolution:
+      integrity: sha512-sjiUsi9M4RAGHktC1drQfCr5C5eriu24Lfbt4s+7SykztEOwVZtbFk1RRq0tzLxcMxMYTBR+zMQaG07J/btayQ==
+  /pug-filters/4.0.0:
+    dependencies:
+      constantinople: 4.0.1
+      jstransformer: 1.0.0
+      pug-error: 2.0.0
+      pug-walk: 2.0.0
+      resolve: 1.20.0
+    dev: false
+    resolution:
+      integrity: sha512-yeNFtq5Yxmfz0f9z2rMXGw/8/4i1cCFecw/Q7+D0V2DdtII5UvqE12VaZ2AY7ri6o5RNXiweGH79OCq+2RQU4A==
+  /pug-lexer/5.0.1:
+    dependencies:
+      character-parser: 2.2.0
+      is-expression: 4.0.0
+      pug-error: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-0I6C62+keXlZPZkOJeVam9aBLVP2EnbeDw3An+k0/QlqdwH6rv8284nko14Na7c0TtqtogfWXcRoFE4O4Ff20w==
+  /pug-linker/4.0.0:
+    dependencies:
+      pug-error: 2.0.0
+      pug-walk: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-gjD1yzp0yxbQqnzBAdlhbgoJL5qIFJw78juN1NpTLt/mfPJ5VgC4BvkoD3G23qKzJtIIXBbcCt6FioLSFLOHdw==
+  /pug-load/3.0.0:
+    dependencies:
+      object-assign: 4.1.1
+      pug-walk: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-OCjTEnhLWZBvS4zni/WUMjH2YSUosnsmjGBB1An7CsKQarYSWQ0GCVyd4eQPMFJqZ8w9xgs01QdiZXKVjk92EQ==
+  /pug-parser/6.0.0:
+    dependencies:
+      pug-error: 2.0.0
+      token-stream: 1.0.0
+    dev: false
+    resolution:
+      integrity: sha512-ukiYM/9cH6Cml+AOl5kETtM9NR3WulyVP2y4HOU45DyMim1IeP/OOiyEWRr6qk5I5klpsBnbuHpwKmTx6WURnw==
+  /pug-runtime/3.0.1:
+    dev: false
+    resolution:
+      integrity: sha512-L50zbvrQ35TkpHwv0G6aLSuueDRwc/97XdY8kL3tOT0FmhgG7UypU3VztfV/LATAvmUfYi4wNxSajhSAeNN+Kg==
+  /pug-strip-comments/2.0.0:
+    dependencies:
+      pug-error: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-zo8DsDpH7eTkPHCXFeAk1xZXJbyoTfdPlNR0bK7rpOMuhBYb0f5qUVCO1xlsitYd3w5FQTK7zpNVKb3rZoUrrQ==
+  /pug-walk/2.0.0:
+    dev: false
+    resolution:
+      integrity: sha512-yYELe9Q5q9IQhuvqsZNwA5hfPkMJ8u92bQLIMcsMxf/VADjNtEYptU+inlufAFYcWdHlwNfZOEnOOQrZrcyJCQ==
+  /pug/3.0.2:
+    dependencies:
+      pug-code-gen: 3.0.2
+      pug-filters: 4.0.0
+      pug-lexer: 5.0.1
+      pug-linker: 4.0.0
+      pug-load: 3.0.0
+      pug-parser: 6.0.0
+      pug-runtime: 3.0.1
+      pug-strip-comments: 2.0.0
+    dev: false
+    resolution:
+      integrity: sha512-bp0I/hiK1D1vChHh6EfDxtndHji55XP/ZJKwsRqrz6lRia6ZC2OZbdAymlxdVFwd1L70ebrVJw4/eZ79skrIaw==
+  /resolve/1.20.0:
+    dependencies:
+      is-core-module: 2.2.0
+      path-parse: 1.0.6
+    dev: false
+    resolution:
+      integrity: sha512-wENBPt4ySzg4ybFQW2TT1zMQucPK95HSh/nq2CFTZVOGut2+pQvSsgtda4d26YrYcr067wjbmzOG8byDPBX63A==
+  /to-fast-properties/2.0.0:
+    dev: false
+    engines:
+      node: '>=4'
+    resolution:
+      integrity: sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=
+  /token-stream/1.0.0:
+    dev: false
+    resolution:
+      integrity: sha1-zCAOqyYT9BZtJ/+a/HylbUnfbrQ=
+  /typescript/4.2.3:
+    dev: false
+    engines:
+      node: '>=4.2.0'
+    hasBin: true
+    resolution:
+      integrity: sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
+  /void-elements/3.1.0:
+    dev: false
+    engines:
+      node: '>=0.10.0'
+    resolution:
+      integrity: sha1-YU9/v42AHwu18GYfWy9XhXUOTwk=
+  /with/7.0.2:
+    dependencies:
+      '@babel/parser': 7.13.10
+      '@babel/types': 7.13.0
+      assert-never: 1.2.1
+      babel-walk: 3.0.0-canary-5
+    dev: false
+    engines:
+      node: '>= 10.0.0'
+    resolution:
+      integrity: sha512-RNGKj82nUPg3g5ygxkQl0R937xLyho1J24ItRCBTr/m1YnZkzJy1hUiHUJrc/VlsDQzsCnInEGSg3bci0Lmd4w==
+specifiers:
+  '@extollo/di': file:../di
+  '@extollo/util': file:../util
+  '@types/negotiator': ^0.6.1
+  '@types/pug': ^2.0.4
+  dotenv: ^8.2.0
+  negotiator: ^0.6.2
+  pug: ^3.0.2
+  typescript: ^4.1.3

src/http/kernel/HTTPKernel.ts

@@ -4,7 +4,7 @@ import {HTTPKernelModule} from "./HTTPKernelModule";
 import {Logging} from "../../service/Logging";
 import {AppClass} from "../../lifecycle/AppClass";
 import {Request} from "../lifecycle/Request";
-import {http} from "../response/HTTPErrorResponseFactory";
+import {error} from "../response/ErrorResponseFactory";
 
 /**
  * Interface for fluently registering kernel modules into the kernel.
@@ -73,7 +73,7 @@ export class HTTPKernel extends AppClass {
             }
         } catch (e: any) {
             this.logging.error(e)
-            await http(HTTPStatus.REQUEST_TIMEOUT).write(request)
+            await error(e).status(HTTPStatus.INTERNAL_SERVER_ERROR).write(request)
         }
 
         this.logging.verbose('Finished kernel lifecycle')

src/http/response/ViewResponseFactory.ts

@@ -0,0 +1,22 @@
+import {Container} from "@extollo/di";
+import {ResponseFactory} from "./ResponseFactory";
+import {Request} from "../lifecycle/Request";
+import {ViewEngine} from "../../views/ViewEngine";
+
+export function view(name: string, data?: {[key: string]: any}): ViewResponseFactory {
+    return new ViewResponseFactory(name, data)
+}
+
+export class ViewResponseFactory extends ResponseFactory {
+    constructor(
+        public readonly viewName: string,
+        public readonly data?: {[key: string]: any}
+    ) { super() }
+
+    public async write(request: Request) {
+        const viewEngine = <ViewEngine> Container.getContainer().make(ViewEngine)
+        request.response.body = await viewEngine.renderByName(this.viewName, this.data || {})
+        request.response.setHeader('Content-Type', 'text/html; charset=utf-8')
+        return request
+    }
+}

src/index.ts

@@ -29,6 +29,7 @@ export * from './http/response/JSONResponseFactory'
 export * from './http/response/ResponseFactory'
 export * from './http/response/StringResponseFactory'
 export * from './http/response/TemporaryRedirectResponseFactory'
+export * from './http/response/ViewResponseFactory'
 
 export * from './http/routing/ActivatedRoute'
 export * from './http/routing/Route'
@@ -51,3 +52,7 @@ export * from './service/Config'
 export * from './service/Controllers'
 export * from './service/HTTPServer'
 export * from './service/Routing'
+
+export * from './views/ViewEngine'
+export * from './views/ViewEngineFactory'
+export * from './views/PugViewEngine'

src/service/Config.ts

@@ -6,4 +6,12 @@ export class Config extends CanonicalRecursive {
     protected appPath: string[] = ['configs']
     protected suffix: string = '.config.js'
     protected canonicalItem: string = 'config'
+
+    public async up() {
+        await super.up()
+
+        if ( this.get('server.debug', false) ) {
+            Error.stackTraceLimit = Infinity
+        }
+    }
 }

src/service/HTTPServer.ts

@@ -11,6 +11,7 @@ import {InjectSessionHTTPModule} from "../http/kernel/module/InjectSessionHTTPMo
 import {PersistSessionHTTPModule} from "../http/kernel/module/PersistSessionHTTPModule";
 import {MountActivatedRouteHTTPModule} from "../http/kernel/module/MountActivatedRouteHTTPModule";
 import {ExecuteResolvedRouteHandlerHTTPModule} from "../http/kernel/module/ExecuteResolvedRouteHandlerHTTPModule";
+import {error} from "../http/response/ErrorResponseFactory";
 
 @Singleton()
 export class HTTPServer extends Unit {
@@ -76,7 +77,12 @@ export class HTTPServer extends Unit {
                 .run()
                 .catch(e => this.logging.error(e))
 
+            try {
                 await this.kernel.handle(extolloReq)
+            } catch (e) {
+                await error(e).write(extolloReq)
+            }
+
             await extolloReq.response.send()
         }
     }

src/service/Routing.ts

@@ -4,6 +4,7 @@ import {Unit} from "../lifecycle/Unit"
 import {Logging} from "./Logging"
 import {Route} from "../http/routing/Route";
 import {HTTPMethod} from "../http/lifecycle/Request";
+import {ViewEngineFactory} from "../views/ViewEngineFactory";
 
 @Singleton()
 export class Routing extends Unit {
@@ -13,6 +14,8 @@ export class Routing extends Unit {
     protected compiledRoutes: Collection<Route> = new Collection<Route>()
 
     public async up() {
+        this.app().registerFactory(new ViewEngineFactory());
+
         for await ( const entry of this.path.walk() ) {
             if ( !entry.endsWith('.routes.js') ) {
                 this.logging.debug(`Skipping routes file with invalid suffix: ${entry}`)

src/views/PugViewEngine.ts

@@ -0,0 +1,33 @@
+import {ViewEngine} from "./ViewEngine"
+import {Injectable} from "@extollo/di"
+import * as pug from "pug"
+
+@Injectable()
+export class PugViewEngine extends ViewEngine {
+    protected compileCache: {[key: string]: ((locals?: pug.LocalsObject) => string)} = {}
+
+    public renderString(templateString: string, locals: { [p: string]: any }): string | Promise<string> {
+        return pug.compile(templateString, this.getOptions())(locals)
+    }
+
+    public renderByName(templateName: string, locals: { [p: string]: any }): string | Promise<string> {
+        let compiled = this.compileCache[templateName]
+        if ( compiled ) return compiled(locals)
+
+        if ( !templateName.endsWith('.pug') ) templateName += '.pug'
+        const filePath = this.path.concat(...templateName.split(':'))
+        compiled = pug.compileFile(filePath.toLocal, this.getOptions())
+
+        this.compileCache[templateName] = compiled
+        return compiled(locals)
+    }
+
+    protected getOptions() {
+        return {
+            basedir: this.path.toLocal,
+            debug: this.debug,
+            compileDebug: this.debug,
+            globals: [],
+        }
+    }
+}

src/views/ViewEngine.ts

@@ -0,0 +1,23 @@
+import {AppClass} from "../lifecycle/AppClass"
+import {Config} from "../service/Config"
+import {Container} from "@extollo/di"
+import {UniversalPath} from "@extollo/util"
+
+export abstract class ViewEngine extends AppClass {
+    protected readonly config: Config
+    protected readonly debug: boolean
+
+    constructor() {
+        super()
+        this.config = Container.getContainer().make(Config)
+        this.debug = (this.config.get('server.mode', 'production') === 'development'
+                        || this.config.get('server.debug', false))
+    }
+
+    public get path(): UniversalPath {
+        return this.app().appPath(...['resources', 'views'])  // FIXME allow configuring
+    }
+
+    public abstract renderString(templateString: string, locals: {[key: string]: any}): string | Promise<string>
+    public abstract renderByName(templateName: string, locals: {[key: string]: any}): string | Promise<string>
+}

src/views/ViewEngineFactory.ts

@@ -0,0 +1,66 @@
+import {
+    AbstractFactory,
+    Container,
+    DependencyRequirement,
+    PropertyDependency,
+    isInstantiable,
+    DEPENDENCY_KEYS_METADATA_KEY,
+    DEPENDENCY_KEYS_PROPERTY_METADATA_KEY
+} from "@extollo/di"
+import {Collection, ErrorWithContext} from "@extollo/util"
+import {Logging} from "../service/Logging";
+import {Config} from "../service/Config";
+import {ViewEngine} from "./ViewEngine";
+import {PugViewEngine} from "./PugViewEngine";
+
+export class ViewEngineFactory extends AbstractFactory {
+    protected readonly logging: Logging
+    protected readonly config: Config
+
+    constructor() {
+        super({})
+        this.logging = Container.getContainer().make<Logging>(Logging)
+        this.config = Container.getContainer().make<Config>(Config)
+    }
+
+    produce(dependencies: any[], parameters: any[]): ViewEngine {
+        return new (this.getViewEngineClass())
+    }
+
+    match(something: any) {
+        return something === ViewEngine
+    }
+
+    getDependencyKeys(): Collection<DependencyRequirement> {
+        const meta = Reflect.getMetadata(DEPENDENCY_KEYS_METADATA_KEY, this.getViewEngineClass())
+        if ( meta ) return meta
+        return new Collection<DependencyRequirement>()
+    }
+
+    getInjectedProperties(): Collection<PropertyDependency> {
+        const meta = new Collection<PropertyDependency>()
+        let currentToken = this.getViewEngineClass()
+
+        do {
+            const loadedMeta = Reflect.getMetadata(DEPENDENCY_KEYS_PROPERTY_METADATA_KEY, currentToken)
+            if ( loadedMeta ) meta.concat(loadedMeta)
+            currentToken = Object.getPrototypeOf(currentToken)
+        } while (Object.getPrototypeOf(currentToken) !== Function.prototype && Object.getPrototypeOf(currentToken) !== Object.prototype)
+
+        return meta
+    }
+
+    protected getViewEngineClass() {
+        const ViewEngineClass = this.config.get('server.view_engine.driver', PugViewEngine)
+
+        if ( !isInstantiable(ViewEngineClass) || !(ViewEngineClass.prototype instanceof ViewEngine) ) {
+            const e = new ErrorWithContext('Provided session class does not extend from @extollo/lib.ViewEngine');
+            e.context = {
+                config_key: 'server.view_engine.driver',
+                class: ViewEngineClass.toString(),
+            }
+        }
+
+        return ViewEngineClass
+    }
+}