/usr/share/lua/5.1/nginx/redis/connector.lua is in lua-nginx-redis-connector 0.03-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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redis.add_commands("sentinel")
local sentinel = require "nginx.redis.sentinel"
local ipairs, setmetatable, pcall = ipairs, setmetatable, pcall
local ngx_null = ngx.null
local ngx_log = ngx.log
local ngx_DEBUG = ngx.DEBUG
local ngx_ERR = ngx.ERR
local ngx_re_match = ngx.re.match
local tbl_insert = table.insert
local tbl_remove = table.remove
local tbl_sort = table.sort
local ok, tbl_new = pcall(require, "table.new")
if not ok then
tbl_new = function (narr, nrec) return {} end
end
local _M = {
_VERSION = '0.03',
}
local mt = { __index = _M }
local DEFAULTS = {
host = "127.0.0.1",
port = 6379,
path = nil, -- /tmp/redis.sock
password = nil,
db = 0,
master_name = "mymaster",
role = "master", -- master | slave | any (tries master first, failover to a slave)
sentinels = nil,
cluster_startup_nodes = {},
}
function _M.new()
return setmetatable({
connect_timeout = 100,
read_timeout = 1000,
connection_options = nil, -- pool, etc
}, mt)
end
function _M.set_connect_timeout(self, timeout)
self.connect_timeout = timeout
end
function _M.set_read_timeout(self, timeout)
self.read_timeout = timeout
end
function _M.set_connection_options(self, options)
self.connection_options = options
end
local function parse_dsn(params)
local url = params.url
if url then
local url_pattern = [[^(?:(redis|sentinel)://)(?:([^@]*)@)?([^:/]+)(?::(\d+|[msa]+))/?(.*)$]]
local m, err = ngx_re_match(url, url_pattern, "")
if not m then
ngx_log(ngx_ERR, "could not parse DSN: ", err)
else
local fields
if m[1] == "redis" then
fields = { "password", "host", "port", "db" }
elseif m[1] == "sentinel" then
fields = { "password", "master_name", "role", "db" }
end
-- password may not be present
if #m < 5 then tbl_remove(fields, 1) end
local roles = { m = "master", s = "slave", a = "any" }
for i,v in ipairs(fields) do
params[v] = m[i + 1]
if v == "role" then
params[v] = roles[params[v]]
end
end
end
end
end
function _M.connect(self, params)
-- If we have nothing, assume default host connection options apply
if not params or type(params) ~= "table" then
params = {}
end
if params.url then
parse_dsn(params)
end
if params.sentinels then
setmetatable(params, { __index = DEFAULTS } )
return self:connect_via_sentinel(params)
elseif params.startup_cluster_nodes then
setmetatable(params, { __index = DEFAULTS } )
-- TODO: Implement cluster
return nil, "Redis Cluster not yet implemented"
else
setmetatable(params, { __index = DEFAULTS } )
return self:connect_to_host(params)
end
end
local function sort_by_localhost(a, b)
if a.host == "127.0.0.1" then
return true
else
return false
end
end
function _M.connect_via_sentinel(self, params)
local sentinels = params.sentinels
local master_name = params.master_name
local role = params.role
local db = params.db
local password = params.password
local sentnl, err, previous_errors = self:try_hosts(sentinels)
if not sentnl then
return nil, err, previous_errors
end
if role == "master" or role == "any" then
local master, err = sentinel.get_master(sentnl, master_name)
if master then
master.db = db
master.password = password
local redis, err = self:connect_to_host(master)
if redis then
sentnl:set_keepalive()
return redis, err
else
if role == "master" then
return nil, err
end
end
end
end
-- We either wanted a slave, or are failing over to a slave "any"
local slaves, err = sentinel.get_slaves(sentnl, master_name)
sentnl:set_keepalive()
if not slaves then
return nil, err
end
-- Put any slaves on 127.0.0.1 at the front
tbl_sort(slaves, sort_by_localhost)
if db or password then
for i,slave in ipairs(slaves) do
slave.db = db
slave.password = password
end
end
local slave, err, previous_errors = self:try_hosts(slaves)
if not slave then
return nil, err, previous_errors
else
return slave
end
end
-- In case of errors, returns "nil, err, previous_errors" where err is
-- the last error received, and previous_errors is a table of the previous errors.
function _M.try_hosts(self, hosts)
local errors = tbl_new(#hosts, 0)
for i, host in ipairs(hosts) do
local r
r, errors[i] = self:connect_to_host(host)
if r then
return r, tbl_remove(errors), errors
end
end
return nil, tbl_remove(errors), errors
end
function _M.connect_to_host(self, host)
local r = redis.new()
r:set_timeout(self.connect_timeout)
local ok, err
local socket = host.socket
if socket then
if self.connection_options then
ok, err = r:connect(socket, self.connection_options)
else
ok, err = r:connect(socket)
end
else
if self.connection_options then
ok, err = r:connect(host.host, host.port, self.connection_options)
else
ok, err = r:connect(host.host, host.port)
end
end
if not ok then
ngx_log(ngx_ERR, err, " for ", host.host, ":", host.port)
return nil, err
else
r:set_timeout(self, self.read_timeout)
local password = host.password
if password then
local res, err = r:auth(password)
if err then
ngx_log(ngx_ERR, err)
return res, err
end
end
r:select(host.db)
return r, nil
end
end
return _M
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