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local redis_c = require "resty.redis"
local ok, new_tab = pcall(require, "table.new")
if not ok or type(new_tab) ~= "function" then
new_tab = function (narr, nrec) return {} end
end
local _M = new_tab(0, 155)
_M._VERSION = '0.01'
local commands = {
"append", "auth", "bgrewriteaof",
"bgsave", "bitcount", "bitop",
"blpop", "brpop",
"brpoplpush", "client", "config",
"dbsize",
"debug", "decr", "decrby",
"del", "discard", "dump",
"echo",
"eval", "exec", "exists",
"expire", "expireat", "flushall",
"flushdb", "get", "getbit",
"getrange", "getset", "hdel",
"hexists", "hget", "hgetall",
"hincrby", "hincrbyfloat", "hkeys",
"hlen",
"hmget", "hmset", "hscan",
"hset",
"hsetnx", "hvals", "incr",
"incrby", "incrbyfloat", "info",
"keys",
"lastsave", "lindex", "linsert",
"llen", "lpop", "lpush",
"lpushx", "lrange", "lrem",
"lset", "ltrim", "mget",
"migrate",
"monitor", "move", "mset",
"msetnx", "multi", "object",
"persist", "pexpire", "pexpireat",
"ping", "psetex", "psubscribe",
"pttl",
"publish", --[[ "punsubscribe", ]] "pubsub",
"quit",
"randomkey", "rename", "renamenx",
"restore",
"rpop", "rpoplpush", "rpush",
"rpushx", "sadd", "save",
"scan", "scard", "script",
"sdiff", "sdiffstore",
"select", "set", "setbit",
"setex", "setnx", "setrange",
"shutdown", "sinter", "sinterstore",
"sismember", "slaveof", "slowlog",
"smembers", "smove", "sort",
"spop", "srandmember", "srem",
"sscan",
"strlen", --[[ "subscribe", ]] "sunion",
"sunionstore", "sync", "time",
"ttl",
"type", --[[ "unsubscribe", ]] "unwatch",
"watch", "zadd", "zcard",
"zcount", "zincrby", "zinterstore",
"zrange", "zrangebyscore", "zrank",
"zrem", "zremrangebyrank", "zremrangebyscore",
"zrevrange", "zrevrangebyscore", "zrevrank",
"zscan",
"zscore", "zunionstore", "evalsha"
}
local mt = { __index = _M }
local function 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
-- change connect address as you need
function _M.connect_mod( self, redis )
redis:set_timeout(self.timeout)
return redis:connect("127.0.0.1", 6379)
end
function _M.set_keepalive_mod( redis )
-- put it into the connection pool of size 100, with 60 seconds max idle time
return redis:set_keepalive(60000, 1000)
end
function _M.init_pipeline( self )
self._reqs = {}
end
function _M.commit_pipeline( self )
local reqs = self._reqs
if nil == reqs or 0 == #reqs then
return {}, "no pipeline"
else
self._reqs = nil
end
local redis, err = redis_c:new()
if not redis then
return nil, err
end
local ok, err = self:connect_mod(redis)
if not ok then
return {}, err
end
redis:init_pipeline()
for _, vals in ipairs(reqs) do
local fun = redis[vals[1]]
table.remove(vals , 1)
fun(redis, unpack(vals))
end
local results, err = redis:commit_pipeline()
if not results or err then
return {}, err
end
if is_redis_null(results) then
results = {}
ngx.log(ngx.WARN, "is null")
end
-- table.remove (results , 1)
self.set_keepalive_mod(redis)
for i,value in ipairs(results) do
if is_redis_null(value) then
results[i] = nil
end
end
return results, err
end
function _M.subscribe( self, channel )
local redis, err = redis_c:new()
if not redis then
return nil, err
end
local ok, err = self:connect_mod(redis)
if not ok or err then
return nil, err
end
local res, err = redis:subscribe(channel)
if not res then
return nil, err
end
res, err = redis:read_reply()
if not res then
return nil, err
end
redis:unsubscribe(channel)
self.set_keepalive_mod(redis)
return res, err
end
local function do_command(self, cmd, ... )
if self._reqs then
table.insert(self._reqs, {cmd, ...})
return
end
local redis, err = redis_c:new()
if not redis then
return nil, err
end
local ok, err = self:connect_mod(redis)
if not ok or err then
return nil, err
end
local fun = redis[cmd]
local result, err = fun(redis, ...)
if not result or err then
-- ngx.log(ngx.ERR, "pipeline result:", result, " err:", err)
return nil, err
end
if is_redis_null(result) then
result = nil
end
self.set_keepalive_mod(redis)
return result, err
end
function _M.new(self, opts)
opts = opts or {}
local timeout = (opts.timeout and opts.timeout * 1000) or 1000
local db_index= opts.db_index or 0
for i = 1, #commands do
local cmd = commands[i]
_M[cmd] =
function (self, ...)
return do_command(self, cmd, ...)
end
end
return setmetatable({
timeout = timeout,
db_index = db_index,
_reqs = nil }, mt)
end
return _M
@anjia0532

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anjia0532 commented Aug 15, 2017

https://gist.github.com/moonbingbing/9915c66346e8fddcefb5#file-redis-lua-L202 报错

2017/08/15 14:38:12 [error] 62944#62944: *91 lua entry thread aborted: runtime error: ...openresty/app/lualib/resty/redis_iresty.lua:202: attempt to call method 'connect_mod' (a nil value)
stack traceback:
coroutine 0:
	...openresty/app/lualib/resty/redis_iresty.lua: in function 'set'
	app/lualib/default.lua:4: in function <app/lualib/default.lua:1>, client: 172.60.30.14, server: _, request: "GET / HTTP/1.1", host: "172.60.30.128"

修正,是我的错,调用的时候是

red:set("dog", "an animal")

而我习惯性写成了

red.set("dog", "an animal")

详见lua . : 的区别

补充

基于本代码片段,进行简单的优化及封装 ,github repo anjia0532/lua-resty-redis-util
可以通过opm 进行安装

opm get anjia0532/lua-resty-redis-util
@chrisforbt

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chrisforbt commented Jan 5, 2018

这个只能在没有区分数据库的情况下使用,如果业务逻辑上面需要区分数据库:先调用redis_db:select(db_index),再redis_db:commond,很有可能直接操作了别的数据库。

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