/usr/share/lua/5.1/nginx/memcached.lua is in lua-nginx-memcached 0.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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local sub = string.sub
local escape_uri = ngx.escape_uri
local unescape_uri = ngx.unescape_uri
local match = string.match
local tcp = ngx.socket.tcp
local strlen = string.len
local insert = table.insert
local concat = table.concat
local setmetatable = setmetatable
local type = type
local error = error
module(...)
_VERSION = '0.10'
local mt = { __index = _M }
function new(self, opts)
local sock, err = tcp()
if not sock then
return nil, err
end
local escape_key = escape_uri
local unescape_key = unescape_uri
if opts then
local key_transform = opts.key_transform
if key_transform then
escape_key = key_transform[1]
unescape_key = key_transform[2]
if not escape_key or not unescape_key then
return nil, "expecting key_transform = { escape, unescape } table"
end
end
end
return setmetatable({
sock = sock,
escape_key = escape_key,
unescape_key = unescape_key,
}, 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
local function _multi_get(self, keys)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local nkeys = #keys
if nkeys == 0 then
return {}, nil
end
local escape_key = self.escape_key
local cmd = {"get"}
for i = 1, nkeys do
insert(cmd, " ")
insert(cmd, escape_key(keys[i]))
end
insert(cmd, "\r\n")
-- print("multi get cmd: ", cmd)
local bytes, err = sock:send(concat(cmd))
if not bytes then
return nil, err
end
local unescape_key = self.unescape_key
local results = {}
while true do
local line, err = sock:receive()
if not line then
return nil, err
end
if line == 'END' then
break
end
local key, flags, len = match(line, '^VALUE (%S+) (%d+) (%d+)$')
-- print("key: ", key, "len: ", len, ", flags: ", flags)
if key then
local data, err = sock:receive(len)
if not data then
return nil, err
end
results[unescape_key(key)] = {data, flags}
data, err = sock:receive(2) -- discard the trailing CRLF
if not data then
return nil, err
end
end
end
return results
end
function get(self, key)
if type(key) == "table" then
return _multi_get(self, key)
end
local sock = self.sock
if not sock then
return nil, nil, "not initialized"
end
local cmd = {"get ", self.escape_key(key), "\r\n"}
local bytes, err = sock:send(concat(cmd))
if not bytes then
return nil, nil, "failed to send command: " .. (err or "")
end
local line, err = sock:receive()
if not line then
return nil, nil, "failed to receive 1st line: " .. (err or "")
end
if line == 'END' then
return nil, nil, nil
end
local flags, len = match(line, '^VALUE %S+ (%d+) (%d+)$')
if not flags then
return nil, nil, "bad line: " .. line
end
-- print("len: ", len, ", flags: ", flags)
local data, err = sock:receive(len)
if not data then
return nil, nil, "failed to receive data chunk: " .. (err or "")
end
line, err = sock:receive(2) -- discard the trailing CRLF
if not line then
return nil, nil, "failed to receive CRLF: " .. (err or "")
end
line, err = sock:receive() -- discard "END\r\n"
if not line then
return nil, nil, "failed to receive END CRLF: " .. (err or "")
end
return data, flags
end
local function _multi_gets(self, keys)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local nkeys = #keys
if nkeys == 0 then
return {}, nil
end
local escape_key = self.escape_key
local cmd = {"gets"}
for i = 1, nkeys do
insert(cmd, " ")
insert(cmd, escape_key(keys[i]))
end
insert(cmd, "\r\n")
-- print("multi get cmd: ", cmd)
local bytes, err = sock:send(concat(cmd))
if not bytes then
return nil, err
end
local unescape_key = self.unescape_key
local results = {}
while true do
local line, err = sock:receive()
if not line then
return nil, err
end
if line == 'END' then
break
end
local key, flags, len, cas_uniq =
match(line, '^VALUE (%S+) (%d+) (%d+) (%d+)$')
-- print("key: ", key, "len: ", len, ", flags: ", flags)
if key then
local data, err = sock:receive(len)
if not data then
return nil, err
end
results[unescape_key(key)] = {data, flags, cas_uniq}
data, err = sock:receive(2) -- discard the trailing CRLF
if not data then
return nil, err
end
end
end
return results
end
function gets(self, key)
if type(key) == "table" then
return _multi_gets(self, key)
end
local sock = self.sock
if not sock then
return nil, nil, nil, "not initialized"
end
local cmd = {"gets ", self.escape_key(key), "\r\n"}
local bytes, err = sock:send(concat(cmd))
if not bytes then
return nil, nil, err
end
local line, err = sock:receive()
if not line then
return nil, nil, nil, err
end
if line == 'END' then
return nil, nil, nil, nil
end
local flags, len, cas_uniq = match(line, '^VALUE %S+ (%d+) (%d+) (%d+)$')
if not flags then
return nil, nil, nil, line
end
-- print("len: ", len, ", flags: ", flags)
local data, err = sock:receive(len)
if not data then
return nil, nil, nil, err
end
line, err = sock:receive(2) -- discard the trailing CRLF
if not line then
return nil, nil, nil, err
end
line, err = sock:receive() -- discard "END\r\n"
if not line then
return nil, nil, nil, err
end
return data, flags, cas_uniq
end
local function _expand_table(value)
local segs = {}
local nelems = #value
for i = 1, nelems do
local seg = value[i]
if type(seg) == "table" then
insert(segs, _expand_table(seg))
else
insert(segs, seg)
end
end
return concat(segs)
end
local function _store(self, cmd, key, value, exptime, flags)
if not exptime then
exptime = 0
end
if not flags then
flags = 0
end
local sock = self.sock
if not sock then
return nil, "not initialized"
end
if type(value) == "table" then
value = _expand_table(value)
end
local req = {cmd, " ", self.escape_key(key), " ", flags, " ", exptime, " ",
strlen(value), "\r\n", value, "\r\n"}
local bytes, err = sock:send(concat(req))
if not bytes then
return nil, err
end
local data, err = sock:receive()
if not data then
return nil, err
end
if data == "STORED" then
return 1
end
return nil, data
end
function set(self, ...)
return _store(self, "set", ...)
end
function add(self, ...)
return _store(self, "add", ...)
end
function replace(self, ...)
return _store(self, "replace", ...)
end
function append(self, ...)
return _store(self, "append", ...)
end
function prepend(self, ...)
return _store(self, "prepend", ...)
end
function cas(self, key, value, cas_uniq, exptime, flags)
if not exptime then
exptime = 0
end
if not flags then
flags = 0
end
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local req = {"cas ", self.escape_key(key), " ", flags, " ", exptime, " ",
strlen(value), " ", cas_uniq, "\r\n", value, "\r\n"}
-- local cjson = require "cjson"
-- print("request: ", cjson.encode(req))
local bytes, err = sock:send(concat(req))
if not bytes then
return nil, err
end
local line, err = sock:receive()
if not line then
return nil, err
end
-- print("response: [", line, "]")
if line == "STORED" then
return 1
end
return nil, line
end
function delete(self, key)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
key = self.escape_key(key)
local req = {"delete ", key, "\r\n"}
local bytes, err = sock:send(concat(req))
if not bytes then
return nil, err
end
local res, err = sock:receive()
if not res then
return nil, err
end
if res ~= 'DELETED' then
return nil, res
end
return 1
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 flush_all(self, time)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local req
if time then
req = concat({"flush_all ", time, "\r\n"})
else
req = "flush_all\r\n"
end
local bytes, err = sock:send(req)
if not bytes then
return nil, err
end
local res, err = sock:receive()
if not res then
return nil, err
end
if res ~= 'OK' then
return nil, res
end
return 1
end
local function _incr_decr(self, cmd, key, value)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local req = {cmd, " ", self.escape_key(key), " ", value, "\r\n"}
local bytes, err = sock:send(concat(req))
if not bytes then
return nil, err
end
local line, err = sock:receive()
if not line then
return nil, err
end
if not match(line, '^%d+$') then
return nil, line
end
return line
end
function incr(self, key, value)
return _incr_decr(self, "incr", key, value)
end
function decr(self, key, value)
return _incr_decr(self, "decr", key, value)
end
function stats(self, args)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local req
if args then
req = concat({"stats ", args, "\r\n"})
else
req = "stats\r\n"
end
local bytes, err = sock:send(req)
if not bytes then
return nil, err
end
local lines = {}
while true do
local line, err = sock:receive()
if not line then
return nil, err
end
if line == 'END' then
return lines, nil
end
if not match(line, "ERROR") then
insert(lines, line)
else
return nil, line
end
end
-- cannot reach here...
return lines
end
function version(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local bytes, err = sock:send("version\r\n")
if not bytes then
return nil, err
end
local line, err = sock:receive()
if not line then
return nil, err
end
local ver = match(line, "^VERSION (.+)$")
if not ver then
return nil, ver
end
return ver
end
function quit(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local bytes, err = sock:send("quit\r\n")
if not bytes then
return nil, err
end
return 1
end
function verbosity(self, level)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
local bytes, err = sock:send(concat({"verbosity ", level, "\r\n"}))
if not bytes then
return nil, err
end
local line, err = sock:receive()
if not line then
return nil, err
end
if line ~= 'OK' then
return nil, line
end
return 1
end
function close(self)
local sock = self.sock
if not sock then
return nil, "not initialized"
end
return sock:close()
end
local class_mt = {
-- to prevent use of casual module global variables
__newindex = function (table, key, val)
error('attempt to write to undeclared variable "' .. key .. '"')
end
}
setmetatable(_M, class_mt)
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