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--[[
Copyright (C) 2016 ZTE, Inc. and others. All rights reserved. (ZTE)
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 _M = {
_VERSION = '1.0.0',
STATUS_OK = 0, STATUS_UNSTABLE = 1, STATUS_ERR = 2
}
local msbConf = require('conf.msbinit')
local str_format = string.format
local now = ngx.now
local fail_timeout = msbConf.server.fail_timeout or 10
local max_fails = msbConf.server.max_fails or 1
local cluster_status = {}
_M.cluster_status = cluster_status
function _M.is_server_ok(skey, srv)
return _M.get_srv_status(skey, srv)==_M.STATUS_OK
end
function _M.get_srv_status(skey, srv)
local server_status = cluster_status[skey]
if not server_status then
return _M.STATUS_OK
end
local srv_key = str_format("%s:%d", srv.ip, srv.port)
local srv_status = server_status[srv_key]
if srv_status and srv_status.lastmodify + fail_timeout > now() then
return srv_status.status
end
return _M.STATUS_OK
end
function _M.set_srv_status(skey, srv, failed)
local server_status = cluster_status[skey]
if not server_status then
server_status = {}
cluster_status[skey] = server_status
end
local time_now = now()
local srv_key = str_format("%s:%d", srv.ip, srv.port)
local srv_status = server_status[srv_key]
if not srv_status then -- first set
srv_status = {
status = _M.STATUS_OK,
failed_count = 0,
lastmodify = time_now
}
server_status[srv_key] = srv_status
elseif srv_status.lastmodify + fail_timeout < time_now then -- srv_status expired
srv_status.status = _M.STATUS_OK
srv_status.failed_count = 0
srv_status.lastmodify = time_now
end
if failed then
srv_status.failed_count = srv_status.failed_count + 1
if srv_status.failed_count >= max_fails then
srv_status.status = _M.STATUS_ERR
end
end
end
function _M.check_and_reset_srv_status_ifneed(skey,servers)
local server_status = cluster_status[skey]
--if disabled servers of the service is empty,do nothing
if not server_status then
ngx.log(ngx.DEBUG, "service:",skey," server_status is nil")
return
end
local need_reset = true
for _, srv in ipairs(servers) do
local srv_key = str_format("%s:%d", srv.ip, srv.port)
local srv_status = server_status[srv_key]
if not (srv_status and srv_status.status == _M.STATUS_ERR and srv_status.lastmodify + fail_timeout > now()) then
--once find the server is not disabled now, no need to reset the status table. break the loop
ngx.log(ngx.DEBUG, "service:",skey," donot need reset,break the loop")
need_reset = false
break
end
end
if need_reset then
ngx.log(ngx.DEBUG, "service:",skey," need reset")
cluster_status[skey] = {}
end
end
return _M
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