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--[[
Copyright (c) 2016, Vsevolod Stakhov <vsevolod@highsecure.ru>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
local rspamd_logger = require "rspamd_logger"
local rspamd_redis = require 'rspamd_redis'
local redis_params
local ucl = require "ucl"
require "fun" ()
local settings = {
redis_key = "dynamic_conf",
redis_watch_interval = 10.0,
priority = 10
}
local cur_settings = {
version = 0
}
local function redis_make_request(ev_base, cfg, key, is_write, callback, command, args)
if not ev_base or not redis_params or not callback or not command then
return false,nil,nil
end
local addr
local rspamd_redis = require "rspamd_redis"
if key then
if is_write then
addr = redis_params['write_servers']:get_upstream_by_hash(key)
else
addr = redis_params['read_servers']:get_upstream_by_hash(key)
end
else
if is_write then
addr = redis_params['write_servers']:get_upstream_master_slave(key)
else
addr = redis_params['read_servers']:get_upstream_round_robin(key)
end
end
if not addr then
logger.errx(task, 'cannot select server to make redis request')
end
local options = {
ev_base = ev_base,
config = cfg,
callback = callback,
host = addr:get_addr(),
timeout = redis_params['timeout'],
cmd = command,
args = args
}
if redis_params['password'] then
options['password'] = redis_params['password']
end
if redis_params['db'] then
options['dbname'] = redis_params['db']
end
local ret,conn = rspamd_redis.make_request(options)
return ret,conn,addr
end
local function apply_dynamic_actions(cfg, acts)
each(function(k, v)
if type[v] == 'table' then
v['action'] = k
if not v['priority'] then
v['priority'] = settings.priority
end
rspamd_config:set_metric_action(v)
else
rspamd_config:set_metric_symbol({
action = k,
score = v,
priority = settings.priority
})
end
end, filter(function(k, v)
local act = rspamd_config:get_metric_action(k)
if act and act == v then
return false
end
return true
end, acts))
end
local function apply_dynamic_scores(cfg, sc)
each(function(k, v)
if type[v] == 'table' then
v['name'] = k
if not v['priority'] then
v['priority'] = settings.priority
end
rspamd_config:set_metric_symbol(v)
else
rspamd_config:set_metric_symbol({
name = k,
score = v,
priority = settings.priority
})
end
end, filter(function(k, v)
-- Select elts with scores that are different from local ones
local sym = rspamd_config:get_metric_symbol(k)
if sym and sym.score == v then
return false
end
return true
end, sc))
end
local function apply_dynamic_conf(cfg, data)
if data['scores'] then
-- Apply scores changes
apply_dynamic_scores(cfg, data['scores'])
end
if data['actions'] then
apply_dynamic_actions(cfg, data['actions'])
end
if data['symbols_enabled'] then
each(function(i, v)
cfg:enable_symbol(v)
end, data['symbols_enabled'])
end
if data['symbols_disabled'] then
each(function(i, v)
cfg:disable_symbol(v)
end, data['symbols_disabled'])
end
end
local function check_dynamic_conf(cfg, ev_base)
local function redis_load_cb(err, data)
if data and type(data) == 'string' then
local parser = ucl.parser()
local res,err = parser:parse_string(data)
if err then
rspamd_logger.errx(cfg, "cannot parse dynamic conf from redis: %s", err)
else
apply_dynamic_conf(cfg, res)
cur_settings.version = rversion
cur_settings.data = res
end
end
end
local function redis_check_cb(err, data)
if not err and type(data) == 'string' then
local rver = tonumber(data)
if rver and rver > cur_settings.version then
rspamd_logger.infox(cfg, "need to load fresh dynamic settings with version %s, local version is %s",
rver, cur_settings.version)
redis_make_request(ev_base, cfg, settings.redis_key, false,
redis_load_cb, 'HGET', {settings.redis_key, 'd'})
end
end
end
redis_make_request(ev_base, cfg, settings.redis_key, false,
redis_check_cb, 'HGET', {settings.redis_key, 'v'})
end
local section = rspamd_config:get_all_opt("dynamic_conf")
if section then
redis_params = rspamd_parse_redis_server('dynamic_conf')
if not redis_params then
rspamd_logger.infox(rspamd_config, 'no servers are specified, disabling module')
return
end
for k,v in pairs(section) do
settings[k] = v
end
rspamd_config:add_on_load(function(cfg, ev_base)
rspamd_config:add_periodic(ev_base, settings.redis_watch_interval,
function(cfg, ev_base)
check_dynamic_conf(cfg, ev_base)
return true
end, true)
end)
end
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