特性
- 使用连接池
- 连接只需要一次认证
项目源码
https://github.com/helloJiu/o...
安装
opm install openresty/lua-resty-redis代码 redis.lua
-- redis客户端
local redis = require("resty/redis")
local config = {
host = "127.0.0.1",
port = 6379,
password = "",
db_index = 0,
max_idle_time = 30000,
database = 0,
pool_size = 100,
timeout = 5000,
}
local _M = {}
function _M.new()
local instance = {
host = config.host or "127.0.0.1",
port = config.port or 6379,
password = config.password or "",
timeout = config.timeout or 5000,
database = config.database or 0,
max_idle_time = config.max_idle_time or 60000,
pool_size = config.pool_size or 100
}
setmetatable(instance, {__index = _M})
return instance
end
function _M:exec(func)
local red = redis:new()
-- 为后续操作设置超时（以毫秒为单位）保护，包括connect方法。
red:set_timeout(self.timeout)
-- 建立连接
local ok, err = red:connect(self.host, self.port)
if not ok or err ~= nil then
ngx.log(ngx.ERR, "redis: ", "connect error, host: " .. self.host .. ", port: " .. self.port, err)
return nil, err
end
if self.password ~= "" then
-- 如果连接来自于连接池中，get_reused_times() 永远返回一个非零的值
-- 只有新的连接才会进行授权
local count = red:get_reused_times()
if count == 0 then
ok, err = red:auth(self.password)
if not ok or err ~= nil then
ngx.log(ngx.ERR, "redis: ", "auth error, host: " .. self.host .. ", port: " .. self.port, err)
red:close()
return nil, err
end
end
end
if self.database ~= 0 then
red:select(self.database)
end
-- 执行业务逻辑
local res, err = func(red)
-- print(res, ', ', type(res), ', ', err, ', ', type(err))
if res == nil or err ~= nil then
-- 表示获取数据错误, 不讲连接放回连接池
ngx.log(ngx.ERR, "redis: ", "exec command error" .. self.host .. ", port: " .. self.port, err)
red:close()
return nil, err
end
-- 将连接放回连接池
red:set_keepalive(self.max_idle_time, self.pool_size)
-- 转换结果
if self:is_redis_null(res) then
res = nil
end
return res, err
end
function _M:is_redis_null( res )
if type(res) == "table" then
for k,v in pairs(res) do
if v ~= ngx.null then
return false
end
end
return true
elseif res == ngx.null then
return true
elseif res == nil then
return true
end
return false
end
return _M实际使用
local redis = require("redis")
local red = redis.new()
local v, err = red:exec(function(red)
return red:get("wechat:login_key")
end)
-- print(v, type(v), err, type(err))
if not v then
-- 处理key不存在情况
end
-- 处理存在情况