Lua 的 IO 框架:Luajit IO
Luajit IO 是一個純 Lua 的 IO 框架,提供 C 的高效率,簡單但強大的設計,得益于 luajit 這個 JIT 引擎。可用來開發 TCP/UDP 服務器程序。
下面是連接 redis 的示例代碼:
local ffi = require"ffi"
local null = ffi.new("void*")
local redis = require "resty.redis"
local function test_redis(req, rsp)
local red = redis:new()
-- red:set_timeout(1000) -- 1 sec
-- or connect to a unix domain socket file listened
-- by a redis server:
-- local ok, err = red:connect("unix:/path/to/redis.sock")
local ok, err = red:connect("127.0.0.1", 6379)
if not ok then
rsp:say("failed to connect: ", err)
return
end
ok, err = red:set("dog", "an animal")
if not ok then
rsp:say("failed to set dog: ", err)
return
end
rsp:say("set result: ", ok)
local res, err = red:get("dog")
if not res then
rsp:say("failed to get dog: ", err)
return
end
if res == null then
rsp:say("dog not found.")
return
end
rsp:say("dog: ", res)
red:init_pipeline()
red:set("cat", "Marry")
red:set("horse", "Bob")
red:get("cat")
red:get("horse")
local results, err = red:commit_pipeline()
if not results then
rsp:say("failed to commit the pipelined requests: ", err)
return
end
for i, res in ipairs(results) do
if type(res) == "table" then
if not res[1] then
rsp:say("failed to run command ", i, ": ", res[2])
else
-- process the table value
end
else
-- process the scalar value
end
end
-- put it into the connection pool of size 100,
-- with 10 seconds max idle time
local ok, err = red:set_keepalive(10000, 100)
if not ok then
rsp:say("failed to set keepalive: ", err)
return
end
-- or just close the connection right away:
-- local ok, err = red:close()
-- if not ok then
-- rsp:say("failed to close: ", err)
-- return
-- end
end
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