lua使用zmq和bson实现跨进程通信

下载bson-lua到本地https://github.com/tcoram/bson-lua
参考：http://zeromq.org/bindings:lua
sudo apt-get install lua
sudo apt-get install luarocks
sudo luarocks install lzmq
sudo luarocks install lua-llthreads2

1）实现rep_bson.lua

--require "zhelpers"
local zmq  = require "lzmq"  -- 获取zmq的安装包
local bson = require "bson"  -- get bson package
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
epoch   = os.time({year=1970, month=1, day=1, hour=0})
bsondoc = bson.encode{username="maroc",
		     info={first="todd",
			     last="coram",
			     age=46,
			     signature1=bson.binary("\000\001\002\003",bson.B_GENERIC),
			     signature2=bson.binary("\000\001\002\003"),
			     saved=true,
			     now=bson.utc_datetime(),
			     past=bson.utc_datetime(epoch * 1000),
			     colors={"Red","Green","Blue"}
		     }}

local y = 0
while y>=0 do
    --local x = "This is a zmq test!"
    local x = bsondoc
    y = y + 1
    --local ret = zassert(publisher:recv())
    local ret = publisher:recv()
    print(y.."rep recv"..ret)
--    sleep(1)
    publisher:send(bsondoc)
    --zassert(publisher:send(x))
    -- print(y..":"..x)
end

2）实现req_bson.lua

--require "zhelpers"
local zmq  = require "lzmq"
local bson = require "bson"  -- get bson package
local context = zmq.context();
local requester,err = context:socket{zmq.REQ,connect = "tcp://localhost:5025"}


function print_table(t)
    function printTableHelper(t, spacing)
        for k,v in pairs(t) do
	   print(spacing..tostring(k), v)
	   if type(v) == "table" then
	      printTableHelper(v, spacing.."\t")
	   end
	end
    end
    printTableHelper(t, "");
end


--zassert(requester,err)
for i = 1,10 do
    -- print("hello world")
    --zassert(requester:send("hello"));
    requester:send("hello")
    local ret   = requester:recv()
    luatab, doc = bson.decode(ret)
    print("req recv==="..ret)
    print(doc)
    print_table(bson.decode(ret))
    --print(luatab)
    --print_table(luatab)
    print()
end

3）运行：
#lua5.1 rep_bson.lua
#lua5.1 req_bson.lua