feat: support before and after fn tracer

perf: remove unsed var
perf: add lint
optimize

example/src/als.ts

@@ -0,0 +1,2 @@
+import { AsyncLocalStorage } from 'async_hooks'
+export const als = new AsyncLocalStorage<Record<string, any>>()

example/src/api.ts

@@ -1,4 +1,5 @@
-import { controller, get, post, state, before, validateState, after } from '../../src'
+import { controller, get, post, state, before, validateState, after, middleware } from '../../src'
+import { als } from './als'
 
 // Home
 @controller('/')
@@ -21,12 +22,23 @@ export class HomeController {
 
 // user
 @controller('/user')
+@middleware(async (ctx, next) => {
+  // get trace id by als in any function
+  ctx.set('trace-id', als.getStore().traceId)
+  setTimeout(() => {
+    console.log('async job after api in 1 second in trace:', als.getStore().traceId)
+  }, 1000)
+  return next()
+})
 export class UserController {
 
   // http://localhost:3000/123?name=John
   // { id: 123, name: 'John' }
   @get('/:id')
   @state()
+  @after(async (ctx) => {
+    ctx.set('x-user-id', (ctx.body as any).id)
+  })
   @validateState({
     type: 'object',
     properties: {

example/src/app.ts

@@ -1,12 +1,11 @@
 import * as Koa from 'koa'
 import * as c from '../../src'
-import { AsyncLocalStorage } from 'async_hooks'
 import { initTracer, Reporter } from 'jaeger-client'
 import { Span } from 'opentracing'
+import { als } from './als'
 
 
 // support async local storage
-const als = new AsyncLocalStorage<any>()
 const consoleReporter: Reporter = {
   report(span: Span): void {
     const spanAny: any = span
@@ -16,6 +15,7 @@ const consoleReporter: Reporter = {
     callback && callback()
   },
   setProcess(serviceName: string, tags: any): void {
+    // ignore this method
   }
 }
 // support opentracing tracer like jaeger or zipkin

package.json

@@ -1,10 +1,11 @@
 {
   "name": "@tng/koa-controller",
-  "version": "0.1.1",
+  "version": "1.0.0-alpha.1",
   "description": "Write koa http server with koa-controller by decorator feature in typescript.",
   "main": "lib/index.js",
   "scripts": {
     "build": "tsc",
+    "lint": "eslint src",
     "prepare": "npm run build",
     "test": "mocha",
     "test:coverage": "nyc mocha"
@@ -26,7 +27,10 @@
     "@types/koa-router": "^7.4.4",
     "@types/lodash": "^4.14.191",
     "@types/mocha": "^10.0.1",
-    "@types/node": "^18.13.0",
+    "@types/node": "^18.14.0",
+    "@typescript-eslint/eslint-plugin": "^5.53.0",
+    "@typescript-eslint/parser": "^5.53.0",
+    "eslint": "^8.34.0",
     "koa": "^2.14.1",
     "koa-bodyparser": "^4.3.0",
     "mocha": "^10.2.0",