Lua_zmq 以及socket通信

1，序言，zmq 作为一种通信比较好，快捷的方式，越来越多的开发者使用。

这里提供一个简单的例子来叙述lua_zmq的通信方式：案例是在Mac电脑编写
1，先说zmq中req和rep方式，rep 作为服务端，req作为请求端，req只有先收到req的请求后，才会发消息回复，同理，req只有发送请求后，才会得到rep的消息相应。流程不可变，
上代码：
服务端rep:

require "zhelpers"local zmq = require "lzmq"  -- 获取zmq的安装包local context = zmq.context()   -- 创建一个ZMQ 上下文  ，local publisher, err = context:socket{zmq.REP, bind = "tcp://*:5025"}  -- 调用套接字  服务端将套接字绑定在端口5025  zassert(publisher, err)   -- 开始等待响应 发出应答 如此循环--  客户端是发送请求 并等待服务端的应答local y = 0while y>=0 do     local x = "This is a zmq test!"    y = y + 1    local ret = zassert(publisher:recv())    print(y.."rep recv"..ret)    sleep(1)    zassert(publisher:send(x))    -- print(y..":"..x)end

客户端 req:

---------------------------------------req------------------------------------require "zhelpers"local zmq = require "lzmq"local context = zmq.context();local requester,err = context:socket{zmq.REQ,connect = "tcp://localhost:5025"}zassert(requester,err)for i = 1,10 do    -- print("hello world")    zassert(requester:send("hello"));    local ret = requester:recv()    print("req recv==="..ret)end

2,方式2 zmq中的Sub和Pub,发布和订阅式，Pub可以发布许多消息给不同的用户，Sub通过filter 筛选自 己所需要的内容：

上代码：
pub端：

require "zhelpers"local zmq = require "lzmq"  -- 获取zmq的安装包local context = zmq.context()   -- 创建一个ZMQ 上下文  ，local publisher, err = context:socket{zmq.PUB, bind = "tcp://*:7002"}  -- 调用套接字  服务端将套接字绑定在端口6801  zassert(publisher, err)   -- 开始等待响应 发出应答 如此循环--  客户端是发送请求 并等待服务端的应答local y = 0while y>=0 do     local x = "This is a zmq test"    local xx = "This is a zmq test too"    local xxx = "This is a zmq test too too"    y = y + 1    -- local ret = zassert(publisher:recv())    -- print(y.."rep recv"..ret)    sleep(1)    zassert(publisher:send(x))    zassert(publisher:send(xx))    zassert(publisher:send(xxx))    sleep(1)    print(y..":"..x..xx..xx)end

Sub端：

--------------------------SUB-------------------SUB会过滤PUB来得消息，由filter来定义数据格式local filter =""printf("Collecting updates from weather server ...\n")local context = zmq.context()local subscriber, err = context:socket{zmq.SUB,  -- subscribe = filter;  -- connect   = "tcp://172.15.2.4:6000";  connect = "tcp://*:7002";}zassert(subscriber,err)print(subscriber)local update_nbr, total_temp = 100, 0-- for i = 1, update_nbr dowhile(1) do    print("~~~~~~~~~~~")    local message = subscriber:recv()    -- local y = {}    -- y = string.split(message,%s)    -- print(y..":"..#y)    local x = ""    local table1 = {}    for name1 in string.gmatch(message,"([%d]*)%s+([-]?[%d-]*)%s+([-]?[%d-]*)") do         table.insert(table1.name1)        print(name1)    end    for i=1,7 do        -- x = x..table1[i]..","        print(i)        print(table1[i])    end    -- for name2 in string.gmatch(message,"title_name %w+") do     --  print(name2)    --  x = x..","..name2    -- end    print(x)    print(total_temp.."-> "..message)    total_temp = total_temp + 1end

3，lua 中的socket通信，案例中只有发送以及接受消息，并没有回复的设置，代码后续完善：
socket 通过绑定一个IP地址，端口号，来实现两台机子之间的通信过程。
上代码：
服务端Server:

    -- server.lualocal socket = require("socket")-- local host = "127.0.0.1"local host = "192.168.0.100"local port = "12346"local server = assert(socket.bind(host, port, 1024))server:settimeout(0)local client_tab = {}local conn_count = 0print("Server Start " .. host .. ":" .. port) while 1 do    local conn = server:accept()    if conn then        conn_count = conn_count + 1        client_tab[conn_count] = conn        print("A client successfully connect!")     end    for conn_count, client in pairs(client_tab) do        local recvt, sendt, status = socket.select({client}, nil, 1)        if #recvt > 0 then            local receive, receive_status = client:receive()            if receive_status ~= "closed" then                if receive then                    assert(client:send("Client " .. conn_count .. " Send : "))                    assert(client:send(receive .. "\n"))                    print("Receive Client " .. conn_count .. " : ", receive)                   end            else                table.remove(client_tab, conn_count)                 client:close()                 print("Client " .. conn_count .. " disconnect!")             end        end    endend

客户端Client:
– client.lua

local socket = require("socket")local host = "192.168.0.100"local port = "12346"local sock = assert(socket.connect(host, port))sock:settimeout(0)print("Press enter after input something:")local input, recvt, sendt, statuswhile true do    input = io.read()    if #input > 0 then        assert(sock:send(input .. "\n"))    end    recvt, sendt, status = socket.select({sock}, nil, 1)    while #recvt > 0 do        local response, receive_status = sock:receive()        if receive_status ~= "closed" then            if response then                print(response)                recvt, sendt, status = socket.select({sock}, nil, 1)            end        else            break        end    endend

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