<span>wrk（2）- Lua 脚本的使用</span>

-- POST 请求，演示如何添加
-- HTTP method, body, header

wrk.method = "POST"
wrk.body   = "foo=bar&baz=quux"
wrk.headers["Content-Type"] = "application/x-www-form-urlencoded"

wrk = {
    scheme  = "http",
    host    = "localhost",
    port    = nil,
    method  = "GET",
    path    = "/",
    headers = {},
    body    = nil,
    thread  = <userdata>
}

thread.addr             - get or set the thread's server address，获取或设置服务器地址信息
thread:get(name)        - get the value of a global in the thread's env，获取当前线程参数
thread:set(name, value) - set the value of a global in the thread's env，设置当前线程参数
thread:stop()           - stop the thread，终止线程

latency.min              -- minimum value seen
latency.max              -- maximum value seen
latency.mean             -- average value seen
latency.stdev            -- standard deviation
latency:percentile(99.0) -- 99th percentile value
latency(i)               -- raw value and count

summary = {
  duration = N,  -- run duration in microseconds
  requests = N,  -- total completed requests
  bytes    = N,  -- total bytes received
  errors   = {
    connect = N, -- total socket connection errors
    read    = N, -- total socket read errors
    write   = N, -- total socket write errors
    status  = N, -- total HTTP status codes > 399
    timeout = N  -- total request timeouts
  }
}

-- example script that demonstrates use of setup() to pass
-- data to and from the threads

local counter = 1
local threads = {}

function setup(thread)
-- 给每个线程设置一个 id 参数
   thread:set("id", counter)
-- 将线程添加到 table 中
   table.insert(threads, thread)
   counter = counter + 1
end

function init(args)
-- 初始化两个参数，每个线程都有独立的 requests、responses 参数
   requests  = 0
   responses = 0

-- 打印线程被创建的消息，打印完后，线程正式启动运行
   local msg = "thread %d created"
   print(msg:format(id))
end

function request()
-- 每发起一次请求 +1
   requests = requests + 1
   return wrk.request()
end

function response(status, headers, body)
-- 每得到一次请求的响应 +1
   responses = responses + 1
end

function done(summary, latency, requests)
-- 循环线程 table
   for index, thread in ipairs(threads) do
      local id        = thread:get("id")
      local requests  = thread:get("requests")
      local responses = thread:get("responses")
      local msg = "thread %d made %d requests and got %d responses"
-- 打印每个线程发起了多少个请求，得到了多少次响应
      print(msg:format(id, requests, responses))
   end
end

wrk -d3s -c20 -t5 -s test.lua https://*****/get