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ledis.lua
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ledis.lua
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--- refer from openresty redis lib
local sub = string.sub
local byte = string.byte
local tcp = ngx.socket.tcp
local concat = table.concat
local null = ngx.null
local pairs = pairs
local unpack = unpack
local setmetatable = setmetatable
local tonumber = tonumber
local error = error
local ok, new_tab = pcall(require, "table.new")
if not ok then
new_tab = function (narr, nrec) return {} end
end
local _M = new_tab(0, 155)
_M._VERSION = '0.01'
local commands = {
--[[kv]]
"decr",
"decrby",
"del",
"exists",
"get",
"getset",
"incr",
"incrby",
"mget",
"mset",
"set",
"setnx",
"setex",
"ttl",
"expire",
"expireat",
"persist",
"xscan",
--[[hash]]
"hdel",
"hexists",
"hget",
"hgetall",
"hincrby",
"hkeys",
"hlen",
"hmget",
--[["hmset",]]
"hset",
"hvals",
--[[ledisdb special commands]]
"hclear",
"hmclear",
"hexpire",
"hexpireat",
"httl",
"hpersist",
"hxscan",
--[[list]]
"lindex",
"llen",
"lpop",
"lpush",
"lrange",
"rpop",
"rpush",
--[[ledisdb special commands]]
"lclear",
"lmclear",
"lexpire",
"lexpireat",
"lttl",
"lpersist",
"lxscan",
--[[zset]]
"zadd",
"zcard",
"zcount",
"zincrby",
"zrange",
"zrangebyscore",
"zrank",
"zrem",
"zremrangebyrank",
"zremrangebyscore",
"zrevrange",
"zrevrank",
"zrevrangebyscore",
"zscore",
--[[ledisdb special commands]]
"zclear",
"zmclear",
"zexpire",
"zexpireat",
"zttl",
"zpersist",
"zxscan",
--[[bit]]
"bget",
"bdelete",
"bsetbit",
"bgetbit",
"bmsetbit",
"bcount",
"bopt",
"bexpire",
"bexpireat",
"bttl",
"bpersist",
"bxscan",
--[[set]]
"sadd",
"scard",
"sdiff",
"sdiffstore",
"sinter",
"sinterstore",
"sismember",
"smembers",
"srem",
"sunion",
"sunionstore",
"sclear",
"smclear",
"sexpire",
"sexpireat",
"sttl",
"spersist",
"sxscan",
--[[server]]
"ping",
"echo",
"select",
"info",
"flushall",
"flushdb",
-- [[transaction]]
"begin",
"commit",
"rollback",
-- [[script]]
"eval",
"evalsha",
"script"
}
local mt = { __index = _M }
function _M.new(self)
local sock, err = tcp()
if not sock then
return nil, err
end
return setmetatable({ sock = sock }, mt)
end
function _M.set_timeout(self, timeout)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:settimeout(timeout)
end
function _M.connect(self, ...)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:connect(...)
end
function _M.set_keepalive(self, ...)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:setkeepalive(...)
end
function _M.get_reused_times(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:getreusedtimes()
end
local function close(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:close()
end
_M.close = close
local function _read_reply(self, sock)
local line, err = sock:receive()
if not line then
if err == "timeout" then
sock:close()
end
return nil, err
end
local prefix = byte(line)
if prefix == 36 then -- char '$'
-- print("bulk reply")
local size = tonumber(sub(line, 2))
if size < 0 then
return null
end
local data, err = sock:receive(size)
if not data then
if err == "timeout" then
sock:close()
end
return nil, err
end
local dummy, err = sock:receive(2) -- ignore CRLF
if not dummy then
return nil, err
end
return data
elseif prefix == 43 then -- char '+'
-- print("status reply")
return sub(line, 2)
elseif prefix == 42 then -- char '*'
local n = tonumber(sub(line, 2))
-- print("multi-bulk reply: ", n)
if n < 0 then
return null
end
local vals = new_tab(n, 0);
local nvals = 0
for i = 1, n do
local res, err = _read_reply(self, sock)
if res then
nvals = nvals + 1
vals[nvals] = res
elseif res == nil then
return nil, err
else
-- be a valid redis error value
nvals = nvals + 1
vals[nvals] = {false, err}
end
end
return vals
elseif prefix == 58 then -- char ':'
-- print("integer reply")
return tonumber(sub(line, 2))
elseif prefix == 45 then -- char '-'
-- print("error reply: ", n)
return false, sub(line, 2)
else
return nil, "unkown prefix: \"" .. prefix .. "\""
end
end
local function _gen_req(args)
local nargs = #args
local req = new_tab(nargs + 1, 0)
req[1] = "*" .. nargs .. "\r\n"
local nbits = 1
for i = 1, nargs do
local arg = args[i]
nbits = nbits + 1
if not arg then
req[nbits] = "$-1\r\n"
else
if type(arg) ~= "string" then
arg = tostring(arg)
end
req[nbits] = "$" .. #arg .. "\r\n" .. arg .. "\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
reqs[#reqs + 1] = 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(self, sock)
end
for i = 1, #commands do
local cmd = commands[i]
_M[cmd] =
function (self, ...)
return _do_cmd(self, cmd, ...)
end
end
function _M.hmset(self, hashname, ...)
local args = {...}
if #args == 1 then
local t = args[1]
local n = 0
for k, v in pairs(t) do
n = n + 2
end
local array = new_tab(n, 0)
local i = 0
for k, v in pairs(t) do
array[i + 1] = k
array[i + 2] = v
i = i + 2
end
-- print("key", hashname)
return _do_cmd(self, "hmset", hashname, unpack(array))
end
-- backwards compatibility
return _do_cmd(self, "hmset", hashname, ...)
end
function _M.array_to_hash(self, t)
local n = #t
-- print("n = ", n)
local h = new_tab(0, n / 2)
for i = 1, n, 2 do
h[t[i]] = t[i + 1]
end
return h
end
function _M.add_commands(...)
local cmds = {...}
for i = 1, #cmds do
local cmd = cmds[i]
_M[cmd] =
function (self, ...)
return _do_cmd(self, cmd, ...)
end
end
end
return _M