refactor(exposition): remove express

.eslintrc.yaml

@@ -69,7 +69,7 @@ overrides:
         - always
         - null: always
       '@typescript-eslint/no-unsafe-argument': warn
-      '@typescript-eslint/no-non-null-assertion': warn
+      '@typescript-eslint/no-non-null-assertion': off
       '@typescript-eslint/non-nullable-type-assertion-style': warn
       '@typescript-eslint/unbound-method': warn
 
@@ -80,8 +80,8 @@ overrides:
   - files: ['**/features/**/*.ts']
     extends: 'plugin:@typescript-eslint/disable-type-checked'
     rules:
-       '@typescript-eslint/prefer-nullish-coalescing': 'off'
-       '@typescript-eslint/strict-boolean-expressions': 'off'
+      '@typescript-eslint/prefer-nullish-coalescing': 'off'
+      '@typescript-eslint/strict-boolean-expressions': 'off'
 parserOptions:
   project: true
 env:

extensions/exposition/components/octets.storage/operations/store.js

@@ -2,7 +2,7 @@
 
 function store (input, context) {
   const { storage, request, accept, meta } = input
-  const path = request.path
+  const path = request.url
   const claim = request.headers['content-type']
 
   return context.storages[storage].put(path, request, { claim, accept, meta })

extensions/exposition/features/octets.entries.feature

@@ -1,4 +1,4 @@
-Feature: Accessing entires
+Feature: Accessing entries
 
   Scenario: Entries are not accessible by default
     Given the annotation:

extensions/exposition/features/steps/components/echo/manifest.toa.yaml

@@ -1,4 +1,5 @@
 name: echo
+version: 0.0.0
 
 operations:
   compute:

extensions/exposition/features/steps/components/octets.tester/manifest.toa.yaml

@@ -1,5 +1,6 @@
 namespace: octets
 name: tester
+version: 0.0.0
 
 storages: octets
 

extensions/exposition/package.json

@@ -20,10 +20,8 @@
     "@toa.io/core": "1.0.0-alpha.3",
     "@toa.io/generic": "1.0.0-alpha.3",
     "@toa.io/schemas": "1.0.0-alpha.3",
-    "@toa.io/streams": "1.0.0-alpha.3",
     "bcryptjs": "2.4.3",
     "error-value": "0.3.0",
-    "express": "4.18.2",
     "js-yaml": "4.1.0",
     "matchacho": "0.3.5",
     "msgpackr": "1.10.1",
@@ -49,7 +47,6 @@
     "@toa.io/extensions.storages": "1.0.0-alpha.3",
     "@types/bcryptjs": "2.4.3",
     "@types/cors": "2.8.13",
-    "@types/express": "4.17.17",
     "@types/negotiator": "0.6.1"
   },
   "gitHead": "24d68d70a56717f2f4441cc9884a60f9fee0863e"

extensions/exposition/source/Directive.test.ts

@@ -2,8 +2,8 @@ import assert from 'node:assert'
 import { generate } from 'randomstring'
 import { DirectivesFactory, type Family } from './Directive'
 import { type syntax } from './RTD'
-import { type IncomingMessage } from './HTTP'
 import { type Remotes } from './Remotes'
+import type { Context } from './HTTP'
 
 const families: Array<jest.MockedObjectDeep<Family>> = [
   {
@@ -76,7 +76,7 @@ it('should apply directive', async () => {
   }
 
   const directives = factory.create([declaration])
-  const request = generate() as unknown as IncomingMessage
+  const request = generate() as unknown as Context
   const directive = families[0].create.mock.results[0].value
 
   await directives.preflight(request, [])
@@ -89,7 +89,7 @@ it('should apply directive', async () => {
 
 it('should apply mandatory families', async () => {
   const directives = factory.create([])
-  const request = generate() as unknown as IncomingMessage
+  const request = generate() as unknown as Context
 
   await directives.preflight(request, [])
 

extensions/exposition/source/Directive.ts

@@ -1,4 +1,4 @@
-import type { IncomingMessage, OutgoingMessage } from './HTTP'
+import type { Context, OutgoingMessage } from './HTTP'
 import type { Remotes } from './Remotes'
 import type { Output } from './io'
 import type * as RTD from './RTD'
@@ -10,15 +10,15 @@ export class Directives implements RTD.Directives<Directives> {
     this.sets = sets
   }
 
-  public async preflight (request: IncomingMessage, parameters: RTD.Parameter[]): Promise<Output> {
+  public async preflight (context: Context, parameters: RTD.Parameter[]): Promise<Output> {
     for (const set of this.sets) {
       if (set.family.preflight === undefined)
         continue
 
-      const output = await set.family.preflight(set.directives, request, parameters)
+      const output = await set.family.preflight(set.directives, context, parameters)
 
       if (output !== null) {
-        await this.settle(request, output)
+        await this.settle(context, output)
 
         return output
       }
@@ -27,10 +27,10 @@ export class Directives implements RTD.Directives<Directives> {
     return null
   }
 
-  public async settle (request: IncomingMessage, response: OutgoingMessage): Promise<void> {
+  public async settle (context: Context, response: OutgoingMessage): Promise<void> {
     for (const set of this.sets)
       if (set.family.settle !== undefined)
-        await set.family.settle(set.directives, request, response)
+        await set.family.settle(set.directives, context, response)
   }
 
   public merge (directives: Directives): void {
@@ -39,7 +39,7 @@ export class Directives implements RTD.Directives<Directives> {
 }
 
 export class DirectivesFactory implements RTD.DirectivesFactory<Directives> {
-  private readonly remtoes: Remotes
+  private readonly remotes: Remotes
   private readonly families: Record<string, Family> = {}
   private readonly mandatory: string[] = []
 
@@ -51,7 +51,7 @@ export class DirectivesFactory implements RTD.DirectivesFactory<Directives> {
         this.mandatory.push(family.name)
     }
 
-    this.remtoes = remotes
+    this.remotes = remotes
   }
 
   public create (declarations: RTD.syntax.Directive[]): Directives {
@@ -67,7 +67,7 @@ export class DirectivesFactory implements RTD.DirectivesFactory<Directives> {
       if (family === undefined)
         throw new Error(`Directive family '${declaration.family}' is not found.`)
 
-      const directive = family.create(declaration.name, declaration.value, this.remtoes)
+      const directive = family.create(declaration.name, declaration.value, this.remotes)
 
       groups[family.name] ??= []
       groups[family.name].push(directive)
@@ -109,11 +109,11 @@ export interface Family<TDirective = any, TExtension = any> {
   create: (name: string, value: any, remotes: Remotes) => TDirective
 
   preflight?: (directives: TDirective[],
-    request: IncomingMessage & TExtension,
+    request: Context & TExtension,
     parameters: RTD.Parameter[]) => Output | Promise<Output>
 
   settle?: (directives: TDirective[],
-    request: IncomingMessage & TExtension,
+    request: Context & TExtension,
     response: OutgoingMessage) => void | Promise<void>
 }
 

extensions/exposition/source/Factory.ts

@@ -9,6 +9,7 @@ import { type Directives, DirectivesFactory } from './Directive'
 import { Composition } from './Composition'
 import * as root from './root'
 import { Interception } from './Interception'
+import type { Broadcast } from './Gateway'
 import type { Connector, Locator, extensions } from '@toa.io/core'
 
 export class Factory implements extensions.Factory {
@@ -19,15 +20,15 @@ export class Factory implements extensions.Factory {
   }
 
   public tenant (locator: Locator, node: syntax.Node): Connector {
-    const broadcast = this.boot.bindings.broadcast(CHANNEL, locator.id)
+    const broadcast: Broadcast = this.boot.bindings.broadcast(CHANNEL, locator.id)
 
     return new Tenant(broadcast, locator, node)
   }
 
   public service (): Connector | null {
     const debug = process.env.TOA_EXPOSITION_DEBUG === '1'
     const trace = process.env.TOA_EXPOSITION_TRACE === '1'
-    const broadcast = this.boot.bindings.broadcast(CHANNEL)
+    const broadcast: Broadcast = this.boot.bindings.broadcast(CHANNEL)
     const server = Server.create({ methods: syntax.verbs, debug, trace })
     const remotes = new Remotes(this.boot)
     const node = root.resolve()
@@ -37,10 +38,12 @@ export class Factory implements extensions.Factory {
     const tree = new Tree<Endpoint, Directives>(node, methods, directives)
 
     const composition = new Composition(this.boot)
-    const gateway = new Gateway(broadcast, server, tree, interception)
+    const gateway = new Gateway(broadcast, tree, interception)
 
     gateway.depends(remotes)
     gateway.depends(composition)
+
+    server.attach(gateway.process.bind(gateway))
     server.depends(gateway)
 
     return server

extensions/exposition/source/Gateway.ts

@@ -13,79 +13,75 @@ export class Gateway extends Connector {
   private readonly broadcast: Broadcast
   private readonly tree: Tree<Endpoint, Directives>
   private readonly interceptor: Interception
-  private readonly server: Connector
 
-  // eslint-disable-next-line max-params, max-len
-  public constructor (broadcast: Broadcast, server: http.Server, tree: Tree<Endpoint, Directives>, interception: Interception) {
+  // eslint-disable-next-line max-len
+  public constructor (broadcast: Broadcast, tree: Tree<Endpoint, Directives>, interception: Interception) {
     super()
 
     this.broadcast = broadcast
     this.tree = tree
     this.interceptor = interception
-    this.server = server
 
     this.depends(broadcast)
-    // this.depends(server)
-
-    server.attach(this.process.bind(this))
-  }
-
-  protected override async open (): Promise<void> {
-    await this.discover()
-
-    console.info('Gateway has started and is awaiting resource branches.')
-  }
-
-  protected override dispose (): void {
-    console.info('Gateway is closed.')
   }
 
-  private async process (request: http.IncomingMessage): Promise<http.OutgoingMessage> {
-    const interception = await request.timing.capture('gate:intercept',
-      this.interceptor.intercept(request))
+  public async process (context: http.Context): Promise<http.OutgoingMessage> {
+    const interception = await context.timing.capture('gate:intercept',
+      this.interceptor.intercept(context))
 
     if (interception !== null)
       return interception
 
-    const match = this.tree.match(request.path)
+    const match = this.tree.match(context.url.pathname)
 
     if (match === null)
       throw new http.NotFound()
 
     const { node, parameters } = match
 
-    if (!(request.method in node.methods))
+    if (!(context.request.method in node.methods))
       throw new http.MethodNotAllowed()
 
-    const method = node.methods[request.method]
+    const method = node.methods[context.request.method]
 
-    const interruption = await request.timing.capture('gate:preflight',
-      method.directives.preflight(request, parameters))
+    const interruption = await context.timing.capture('gate:preflight',
+      method.directives.preflight(context, parameters))
 
     const response = interruption ??
-      await request.timing.capture('gate:call', this.call(method, request, parameters))
+      await context.timing.capture('gate:call', this.call(method, context, parameters))
 
-    await request.timing.capture('gate:settle', method.directives.settle(request, response))
+    await context.timing.capture('gate:settle', method.directives.settle(context, response))
 
     return response
   }
 
+  protected override async open (): Promise<void> {
+    await this.discover()
+
+    console.info('Gateway has started and is awaiting resource branches.')
+  }
+
+  protected override dispose (): void {
+    console.info('Gateway is closed.')
+  }
+
   private async call
-  (method: Method<Endpoint, Directives>, request: http.IncomingMessage, parameters: Parameter[]):
+  (method: Method<Endpoint, Directives>, context: http.Context, parameters: Parameter[]):
   Promise<http.OutgoingMessage> {
-    if (request.path[request.path.length - 1] !== '/')
+    if (context.url.pathname[context.url.pathname.length - 1] !== '/')
       throw new http.NotFound('Trailing slash is required.')
 
-    if (request.encoder === null)
+    if (context.encoder === null)
       throw new http.NotAcceptable()
 
     if (method.endpoint === null)
       throw new http.MethodNotAllowed()
 
-    const body = await request.parse()
+    const body = await context.body()
+    const query = Object.fromEntries(context.url.searchParams)
 
     const reply = await method.endpoint
-      .call(body, request.query, parameters)
+      .call(body, query, parameters)
       .catch(rethrow) as Maybe<unknown>
 
     if (reply instanceof Error)
@@ -111,4 +107,4 @@ export class Gateway extends Connector {
   }
 }
 
-type Broadcast = bindings.Broadcast<Label>
+export type Broadcast = bindings.Broadcast<Label>

extensions/exposition/source/HTTP/Context.ts

@@ -0,0 +1,60 @@
+import Negotiator from 'negotiator'
+import { Timing } from './Timing'
+import { type Format, formats, types } from './formats'
+import { read } from './messages'
+import type { OutgoingMessage } from './messages'
+import type * as http from 'node:http'
+
+export class Context {
+  public readonly request: IncomingMessage
+  public readonly url: URL
+  public readonly subtype: string | null = null
+  public readonly encoder: Format | null = null
+  public readonly timing: Timing
+
+  public readonly pipelines: {
+    body: Array<(input: unknown) => unknown>
+    response: Array<(output: OutgoingMessage) => void>
+  } = { body: [], response: [] }
+
+  public constructor (request: IncomingMessage, trace = false) {
+    this.request = request
+
+    // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- checked by Server
+    this.url = new URL(request.url, `https://${request.headers.host}`)
+    this.timing = new Timing(trace)
+
+    if (this.request.headers.accept !== undefined) {
+      const match = SUBTYPE.exec(this.request.headers.accept)
+
+      if (match !== null) {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion -- checked by regex
+        const { type, subtype, suffix } = match.groups!
+
+        this.request.headers.accept = `${type}/${suffix}`
+        this.subtype = subtype
+      }
+    }
+
+    const negotiator = new Negotiator(this.request)
+    const mediaType = negotiator.mediaType(types)
+
+    if (mediaType !== undefined)
+      this.encoder = formats[mediaType]
+  }
+
+  public async body<T> (): Promise<T> {
+    const value = await read(this)
+
+    return this.pipelines.body.length === 0
+      ? value
+      : this.pipelines.body.reduce((value, transform) => transform(value), value)
+  }
+}
+
+export interface IncomingMessage extends http.IncomingMessage {
+  url: string
+  method: string
+}
+
+const SUBTYPE = /^(?<type>\w{1,32})\/(vnd\.toa\.(?<subtype>\S{1,32})\+)(?<suffix>\S{1,32})$/