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redis.lua
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redis.lua
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local log = require "logging"
local class = require "class"
local Co = require "internal.Co"
local tcp = require "internal.TCP"
local stream = require "stream"
local tcp_send = stream.send
local tcp_readline = stream.readline
local tcp_readbytes = stream.readbytes
local new_tab = require "sys".new_tab
local Log = log:new({ dump = true, path = 'protocol-redis' })
local co_spawn = Co.spawn
local type = type
local pcall = pcall
local ipairs = ipairs
local assert = assert
local tonumber = tonumber
local tostring = tostring
local insert = table.insert
local concat = table.concat
local unpack = table.unpack
local sub = string.sub
local byte = string.byte
local toint = math.tointeger
local CRLF = '\x0d\x0a'
local redcmd = {}
local function read_response(sock)
local result = tcp_readline(sock, CRLF)
if not result then
sock.state = false
return nil, 'server close!!'
end
-- 断言redis 协议是否支持用于快速排错
return assert(redcmd[byte(result)], "Invalid protocol command : " .. sub(result, 1, 1))(sock, sub(result, 2))
end
local function sock_readbytes(sock, bytes)
return tcp_readbytes(sock, bytes)
end
redcmd[36] = function(sock, data) -- '$'
local bytes = tonumber(data)
if bytes < 0 then
return true, nil
end
local firstline = sock_readbytes(sock, bytes + 2)
return true, sub(firstline, 1, -3)
end
redcmd[43] = function(sock, data) -- '+'
return true, sub(data, 1, -3)
end
redcmd[45] = function(sock, data) -- '-'
return false, sub(data, 1, -3)
end
redcmd[58] = function(sock, data) -- ':'
-- todo: return string later
return true, tonumber(data)
end
redcmd[42] = function(sock, data) -- '*'
local n = tonumber(data)
if n < 0 then
return true, nil
end
local bulk = new_tab(n, 0)
local noerr = true
for i = 1, n do
local ok, v = read_response(sock)
if not ok then
noerr = false
end
bulk[i] = v
end
return noerr, bulk
end
-- 格式化命令为redis protocol
local function CMD(...)
local tab = {...}
local lines = new_tab(#tab, 0)
lines[#lines+1] = "*"..#tab
for index = 1, #tab do
lines[#lines+1] = "$"..#tostring(tab[index])
lines[#lines+1] = tab[index]
if index == #tab then
lines[#lines+1] = ""
end
end
return concat(lines, CRLF)
end
local function read_boolean(sock)
local ok, result = read_response(sock)
if ok then
return ok, result ~= 0 or result == "OK"
end
return ok, result
end
local function redis_login(sock, auth, db)
if type(auth) == 'string' and auth ~= '' then
tcp_send(sock, CMD("AUTH", auth))
local ok, err = read_response(sock)
if not ok then
return nil, err
end
end
if toint(db) and toint(db) >= 0 then
tcp_send(sock, CMD("SELECT", db))
local ok, err = read_response(sock)
if not ok then
return nil, err
end
end
sock.state = true
return true
end
local redis = class("redis")
function redis:ctor(opt)
self.sock = tcp:new()
self.host = opt.host
self.port = opt.port
self.unixdomain = opt.unixdomain
self.auth = opt.auth
self.db = opt.db
end
function redis:isconnected()
return self.sock and self.sock.state or false
end
function redis:connect()
-- 尝试多种连接渠道
if not self.sock:connect_ex(self.unixdomain or "") and not self.sock:connect(self.host, toint(self.port) or 6379) then
return nil, "redis network connect failed."
end
-- Socket Stream Wrapper.
self.sock = stream(self.sock)
-- 登录状态检查
local ok, err = redis_login(self.sock, self.auth, self.db)
if not ok then
return nil, "redis login error:" .. (err or 'close')
end
return true
end
function redis:set_timeout(timeout)
self.sock._timeout = timeout
return self
end
-- 订阅
function redis:psubscribe(pattern, func)
local sock = self.sock
tcp_send(sock, CMD("PSUBSCRIBE", pattern))
local ok, msg = read_response(sock)
if not ok or not msg[2] then
return nil, "PSUBSCRIBE error: 订阅"..tostring(pattern).."失败."
end
co_spawn(function ()
while 1 do
local ok, msg = read_response(sock)
if not ok or not msg or not self.sock then
local ok, err = pcall(func, nil)
if not ok then
Log:ERROR(err)
end
return
end
local data = {type = msg[1], source = msg[2], pattern = pattern, payload = msg[3]}
if #msg > 3 then
data = {type = msg[1], source = msg[3], pattern = pattern, payload = msg[4]}
end
local ok, err = pcall(func, data)
if not ok then
return Log:ERROR(err)
end
end
end)
return ok, msg
end
-- 订阅
function redis:subscribe(pattern, func)
return self:psubscribe(pattern, func)
end
-- 发布
function redis:publish(pattern, data)
local sock = self.sock
tcp_send(sock, CMD("PUBLISH", pattern, data))
return read_response(sock)
end
-- 查询键是否存在
function redis:exists(key)
local sock = self.sock
tcp_send(sock, CMD("EXISTS", key))
return read_boolean(sock)
end
-- 查询元素是否集合成员
function redis:sismember(key, value)
local sock = self.sock
tcp_send(sock, CMD("SISMEMBER", key, value))
return read_boolean(sock)
end
-- 执行命令
function redis:cmd(...)
local sock = self.sock
tcp_send(sock, CMD(...))
return read_response(sock)
end
-- 管道命令
function redis:pipeline(opt)
local cmds = {}
if opt and #opt > 0 then
for _, cmd in ipairs(opt) do
cmds[#cmds+1] = CMD(unpack(cmd))
end
end
local max_read_times = #cmds
if max_read_times > 0 then
local sock = self.sock
tcp_send(sock, concat(cmds))
local rets = new_tab(max_read_times, 0)
for index = 1, max_read_times do
rets[index] = {read_response(sock)}
end
return true, rets
end
return nil
end
function redis:close()
if self.sock then
self.sock.state = false
self.sock:close()
self.sock = nil
end
end
return redis