KOA example

1. 工作于 playground 目录
2. 安装 npm install koa @swtc/lib @swtc/api
3. 创建 koa 文件 koaweb.js

const Koa = require("koa")
const app = new Koa()
const RemoteLib = require("@swtc/lib").Remote
const RemoteApi = require("@swtc/api").Remote
const remotelib = new RemoteLib()
const remoteapi = new RemoteApi({})

// logger

app.use(async (ctx, next) => {
  await next()
  const rt = ctx.response.get("X-Response-Time")
  console.log(`${ctx.method} ${ctx.url} - ${rt}`)
})

// x-response-time

app.use(async (ctx, next) => {
  const start = Date.now()
  await next()
  const ms = Date.now() - start
  ctx.set("X-Response-Time", `${ms}ms`)
})

// response

app.use(async ctx => {
  if (!remotelib.isConnected()) {
    try {
      await remotelib.connectPromise()
      console.log("remote connected")
    } catch (error) {
      console.error(error)
    }
  } else {
    console.log("remote was connected")
  }
  ctx.body = "<div>Hello World</div>"
  let result_api = await remoteapi.getOrderBooks(
    "SWT",
    `CNY+${remotelib._token}`,
    { results_per_page: 10 }
  )
  ctx.body += `
  <div>
  	<h1>using api remote</h1>
	<pre>
	  ${JSON.stringify(result_api, "", 4)}
	</pre>
  </div>
  `
  let result_lib = await remotelib
    .requestOrderBook({
      gets: remotelib.makeCurrency(),
      pays: remotelib.makeCurrency("CNY"),
      limit: 10
    })
    .submitPromise()
  ctx.body += `
  <div>
  	<h1>using lib remote</h1>
	<pre>
	  ${JSON.stringify(result_lib, "", 4)}
	</pre>
  </div>
  `
})

console.log("starting server on port 3000")
app.listen(3000)

4. 脚本式运行

$ node koaweb.js

5. 输出

starting server on port 3000
remote connected
GET / - 4731ms
remote was connected
GET /favicon.ico - 1441ms
remote was connected
GET / - 1672ms
remote was connected
GET /favicon.ico - 1521ms