“这个算是一个 koa 修改进化版！”

有几个特点：

• 中间件使用了迭代器，看着这里：https://github.com/trekjs/middleware
• 去掉了 koa 中的 delegates 模块，速度明显提升！
• 有个开关 app.raw 你可以使用原生 req 和 res 进行操作。
• 大量使用新的语法特性（当然这不是什么新鲜事）。
• 轻量，简洁，优雅（async/await) 目前正在基于 trek-engine 开发 trek 框架（实际上是重构，2015 年是基于 koa，现在有自己的轮子了， 哈哈）.

说了这么多，性能如何？

看这里 benchmarks 或者 https://travis-ci.org/trekjs/engine

Benchmarks

Frameworks' Battle! :fire: :collision:

With wrk

$ make battle

5 middleware

  5 middleware
------- express -------
Hello World
  6114.56

  5 middleware
------- koa -------
Hello World
  6613.55

  5 middleware
------- toa -------
Hello World
  5142.69

  5 middleware
------- trek -------
Hello World
  7393.59

15 middleware

  15 middleware
------- express -------
Hello World
  5681.79

  15 middleware
------- koa -------
Hello World
  6822.63

  15 middleware
------- toa -------
Hello World
  5336.33

  15 middleware
------- trek -------
Hello World
  8198.41

30 middleware

  30 middleware
------- express -------
Hello World
  5168.10

  30 middleware
------- koa -------
Hello World
  6205.17

  30 middleware
------- toa -------
Hello World
  4727.22

  30 middleware
------- trek -------
Hello World
  7982.35

50 middleware

  50 middleware
------- express -------
Hello World
  5393.90

  50 middleware
------- koa -------
Hello World
  5974.12

  50 middleware
------- toa -------
Hello World
  4261.97

  50 middleware
------- trek -------
Hello World
  6634.71

With autocannon

$ benchmarker=autocannon make battle

5 middleware

  5 middleware
------- express -------
Hello World
Stat         Avg     Stdev     Max
Latency (ms) 8.84    1.9       53
Req/Sec      5376.55 532.04    5963
Bytes/Sec    1.13 MB 110.42 kB 1.31 MB
59k requests in 11s, 12.42 MB read

  5 middleware
------- koa -------
Hello World
Stat         Avg       Stdev    Max
Latency (ms) 7.57      1.54     54
Req/Sec      6080.55   415.54   6327
Bytes/Sec    918.99 kB 59.88 kB 983.04 kB
67k requests in 11s, 10.1 MB read

  5 middleware
------- toa -------
Hello World
Stat         Avg     Stdev    Max
Latency (ms) 8.05    4.1      49
Req/Sec      5836.8  494.66   6183
Bytes/Sec    1.01 MB 87.39 kB 1.11 MB
58k requests in 10s, 9.98 MB read

  5 middleware
------- trek -------
Hello World
Stat         Avg      Stdev    Max
Latency (ms) 5.47     1.26     41
Req/Sec      8186.91  516.41   8703
Bytes/Sec    904.1 kB 61.63 kB 983.04 kB
90k requests in 11s, 10 MB read

15 middleware

  15 middleware
------- express -------
Hello World
Stat         Avg     Stdev     Max
Latency (ms) 8.78    1.7       55
Req/Sec      5374.4  508.32    5835
Bytes/Sec    1.13 MB 104.09 kB 1.25 MB
54k requests in 10s, 11.29 MB read

  15 middleware
------- koa -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 8.58      2.42      65
Req/Sec      5493.7    844.72    6559
Bytes/Sec    832.31 kB 124.73 kB 1.02 MB
55k requests in 10s, 8.29 MB read

  15 middleware
------- toa -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 10.08     5.07      57
Req/Sec      4733.9    969.03    5539
Bytes/Sec    813.47 kB 166.77 kB 950.27 kB
47k requests in 10s, 8.09 MB read

  15 middleware
------- trek -------
Hello World
Stat         Avg       Stdev    Max
Latency (ms) 7.57      2.45     47
Req/Sec      6248.82   1321.65  7635
Bytes/Sec    691.11 kB 145.3 kB 851.97 kB
69k requests in 11s, 7.63 MB read

30 middleware

  30 middleware
------- express -------
Hello World
Stat         Avg      Stdev     Max
Latency (ms) 14.45    4.73      110
Req/Sec      3338.37  541.38    4283
Bytes/Sec    699.3 kB 113.42 kB 917.5 kB
37k requests in 11s, 7.71 MB read

  30 middleware
------- koa -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 8.14      2.88      76
Req/Sec      5783.6    927.97    6783
Bytes/Sec    871.63 kB 137.82 kB 1.05 MB
58k requests in 10s, 8.73 MB read

  30 middleware
------- toa -------
Hello World
Stat         Avg       Stdev    Max
Latency (ms) 9.82      4.22     45
Req/Sec      4866.5    305.97   5127
Bytes/Sec    829.03 kB 56.38 kB 884.74 kB
49k requests in 10s, 8.32 MB read

  30 middleware
------- trek -------
Hello World
Stat         Avg       Stdev    Max
Latency (ms) 6.26      1.44     49
Req/Sec      7604.55   749.25   8119
Bytes/Sec    844.52 kB 85.09 kB 917.5 kB
84k requests in 11s, 9.28 MB read

50 middleware

  50 middleware
------- express -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 11.18     3.03      52
Req/Sec      4253.91   756.59    4991
Bytes/Sec    892.18 kB 158.13 kB 1.05 MB
47k requests in 11s, 9.83 MB read

  50 middleware
------- koa -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 8.47      2.83      47
Req/Sec      5566.7    909.66    6583
Bytes/Sec    835.58 kB 133.51 kB 1.02 MB
56k requests in 10s, 8.4 MB read

  50 middleware
------- toa -------
Hello World
Stat         Avg       Stdev     Max
Latency (ms) 12.66     5.5       60
Req/Sec      3794.6    752.37    4671
Bytes/Sec    646.35 kB 123.34 kB 819.2 kB
38k requests in 10s, 6.49 MB read

  50 middleware
------- trek -------
Hello World
Stat         Avg       Stdev    Max
Latency (ms) 7.66      2.89     59
Req/Sec      6124      852.52   7631
Bytes/Sec    677.48 kB 91.67 kB 851.97 kB
61k requests in 10s, 6.8 MB read

Enjoy!

---

Features

• Micro.

• Elegant.

• Fast.

• Lightweight.

• Expressive.

Installation

$ npm install trek-engine

Hello Trek Engine

const co = require('co')
const Engine = require('trek-engine')
const app = new Engine()

// middleware
app.use((ctx, next) => {
  // return promise
  return next()
})

// async/await
app.use(async (ctx, next) => {
  await next()
})

// generator
app.use(co.wrap(function * (ctx, next) {
  yield next()
}))

// response
app.use({ res } => {
  res.end('Hello Koa')
})

app.run(3000)

Benchmarks

See express vs koa vs toa vs trek-engine.

• express

• koa v2

• toa

• trek-engine

---

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