/
redis.lua
354 lines (272 loc) · 8.04 KB
/
redis.lua
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-- Copyright (C) 2012 Zhang "agentzh" Yichun (章亦春)
module("resty.redis", package.seeall)
_VERSION = '0.14'
local commands = {
"append", "auth", "bgrewriteaof",
"bgsave", "blpop", "brpop",
"brpoplpush", "config", "dbsize",
"debug", "decr", "decrby",
"del", "discard", "echo",
"eval", "exec", "exists",
"expire", "expireat", "flushall",
"flushdb", "get", "getbit",
"getrange", "getset", "hdel",
"hexists", "hget", "hgetall",
"hincrby", "hkeys", "hlen",
"hmget", --[[ "hmset", ]] "hset",
"hsetnx", "hvals", "incr",
"incrby", "info", "keys",
"lastsave", "lindex", "linsert",
"llen", "lpop", "lpush",
"lpushx", "lrange", "lrem",
"lset", "ltrim", "mget",
"monitor", "move", "mset",
"msetnx", "multi", "object",
"persist", "ping", "psubscribe",
"publish", "punsubscribe", "quit",
"randomkey", "rename", "renamenx",
"rpop", "rpoplpush", "rpush",
"rpushx", "sadd", "save",
"scard", "script",
"sdiff", "sdiffstore",
"select", "set", "setbit",
"setex", "setnx", "setrange",
"shutdown", "sinter", "sinterstore",
"sismember", "slaveof", "slowlog",
"smembers", "smove", "sort",
"spop", "srandmember", "srem",
"strlen", "subscribe", "sunion",
"sunionstore", "sync", "ttl",
"type", "unsubscribe", "unwatch",
"watch", "zadd", "zcard",
"zcount", "zincrby", "zinterstore",
"zrange", "zrangebyscore", "zrank",
"zrem", "zremrangebyrank", "zremrangebyscore",
"zrevrange", "zrevrangebyscore", "zrevrank",
"zscore", "zunionstore", "evalsha"
}
local class = resty.redis
local mt = { __index = class }
local sub = string.sub
local tcp = ngx.socket.tcp
local insert = table.insert
local concat = table.concat
local len = string.len
local null = ngx.null
function new(self)
local sock, err = tcp()
if not sock then
return nil, err
end
return setmetatable({ sock = sock }, mt)
end
function set_timeout(self, timeout)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:settimeout(timeout)
end
function connect(self, ...)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:connect(...)
end
function set_keepalive(self, ...)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:setkeepalive(...)
end
function get_reused_times(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:getreusedtimes()
end
function close(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:close()
end
local function _read_reply(sock)
local line, err = sock:receive()
if not line then
return nil, err
end
local prefix = sub(line, 1, 1)
if prefix == "$" then
-- print("bulk reply")
local size = tonumber(sub(line, 2))
if size < 0 then
return null
end
local data, err = sock:receive(size)
if not data then
return nil, err
end
local dummy, err = sock:receive(2) -- ignore CRLF
if not dummy then
return nil, err
end
return data
elseif prefix == "+" then
-- print("status reply")
return sub(line, 2)
elseif prefix == "*" then
local n = tonumber(sub(line, 2))
-- print("multi-bulk reply: ", n)
if n < 0 then
return null
end
local vals = {};
for i = 1, n do
local res, err = _read_reply(sock)
if res then
insert(vals, res)
elseif res == nil then
return nil, err
else
-- be a valid redis error value
insert(vals, {false, err})
end
end
return vals
elseif prefix == ":" then
-- print("integer reply")
return tonumber(sub(line, 2))
elseif prefix == "-" then
-- print("error reply: ", n)
return false, sub(line, 2)
else
return nil, "unkown prefix: \"" .. prefix .. "\""
end
end
local function _gen_req(args)
local req = {"*", #args, "\r\n"}
for i, arg in ipairs(args) do
if not arg then
insert(req, "$-1\r\n")
else
insert(req, "$")
insert(req, len(arg))
insert(req, "\r\n")
insert(req, arg)
insert(req, "\r\n")
end
end
-- it is faster to do string concatenation on the Lua land
return concat(req, "")
end
local function _do_cmd(self, ...)
local args = {...}
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local req = _gen_req(args)
local reqs = self._reqs
if reqs then
insert(reqs, req)
return
end
-- print("request: ", table.concat(req, ""))
local bytes, err = sock:send(req)
if not bytes then
return nil, err
end
return _read_reply(sock)
end
function read_reply(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return _read_reply(sock)
end
for i, cmd in ipairs(commands) do
class[cmd] =
function (self, ...)
return _do_cmd(self, cmd, ...)
end
end
function hmset(self, hashname, ...)
local args = {...}
if #args == 1 then
local t = args[1]
local array = {}
for k,v in pairs(t) do
insert(array, k)
insert(array, v)
end
-- print("key", hashname)
return _do_cmd(self, "hmset", hashname, unpack(array))
end
-- backwards compatibility
return _do_cmd(self, "hmset", hashname, ...)
end
function init_pipeline(self)
self._reqs = {}
end
function cancel_pipeline(self)
self._reqs = nil
end
function commit_pipeline(self)
local reqs = self._reqs
if not reqs then
return nil, "no pipeline"
end
self._reqs = nil
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local bytes, err = sock:send(reqs)
if not bytes then
return nil, err
end
local vals = {}
for i = 1, #reqs do
local res, err = _read_reply(sock)
if res then
insert(vals, res)
elseif res == nil then
return nil, err
else
-- be a valid redis error value
insert(vals, {false, err})
end
end
return vals
end
function array_to_hash(self, t)
local h = {}
for i = 1, #t, 2 do
h[t[i]] = t[i + 1]
end
return h
end
function add_commands(...)
local cmds = {...}
local mt = getmetatable(class)
local newindex = mt.__newindex
mt.__newindex = nil
for i = 1, #cmds do
local cmd = cmds[i]
class[cmd] =
function (self, ...)
return _do_cmd(self, cmd, ...)
end
end
mt.__newindex = newindex
end
-- to prevent use of casual module global variables
getmetatable(class).__newindex = function (table, key, val)
error('attempt to write to undeclared variable "' .. key .. '"')
end