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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 msbConf = require('conf.msbinit')
local dbclient = require('dao.db_access')
local tbl_util = require('lib.utils.table_util')
local svc_util = require('lib.utils.svc_util')
local log_util = require('lib.utils.log_util')
local error_handler = require('lib.utils.error_handler')
local tbl_concat = table.concat
local tbl_isempty = tbl_util.isempty
local svc_isactive = svc_util.isactive
local svc_get_url = svc_util.get_url
local svc_get_backend_protocol = svc_util.get_backend_protocol
local svc_use_own_upstream = svc_util.use_own_upstream
local svc_get_key_prefix = svc_util.get_key_prefix
local str_low = string.lower
local ngx_var = ngx.var
local ngx_ctx = ngx.ctx
local log = log_util.log
local error_svc_not_found = error_handler.svc_not_found
local error_upstream_not_found = error_handler.upstream_not_found
local enablerefercheck = msbConf.systemConf.enablerefercheck
local useconsultemplate = msbConf.systemConf.useconsultemplate
---------------------------------------------------------------
--preCheck:
-- determine whether it is websocket request
-- and do internal redirect
---------------------------------------------------------------
if ngx.var.uri == "/" then
local m, err = ngx.re.match(ngx.var.host, "^((25[0-5]|2[0-4]\\d|[01]?\\d\\d?)\\.){3}(25[0-5]|2[0-4]\\d|[01]?\\d\\d?)$","o")
if m then
return ngx.exec("@defaultpage")
end
end
local http_upgrade = ngx_var.http_upgrade
if(ngx_var.websocket_internal_redirect == "on") and http_upgrade and str_low(http_upgrade)== "websocket" then
--ngx.log(ngx.ERR, "Websocket request and redirect to @customwebsocket")
return ngx.exec("@customwebsocket")
end
---------------------------------------------------------------
--step0:Preparation
-- svcnames:service names registered under this port
---------------------------------------------------------------
local req_res = ngx_var.uri
local svc_type = ngx_var.svc_type
local key_prefix = svc_get_key_prefix()
local custom_svc_keypattern = tbl_concat({key_prefix,"custom","*"},":")
local get_svckey_custom = function(svcname)
return tbl_concat({key_prefix,"custom",svcname},":")
end
local svcnames,err = dbclient.load_customsvcnames(custom_svc_keypattern)
if not svcnames then
error_svc_not_found("Failed to load the route table!","keypattern--"..custom_svc_keypattern)
end
---------------------------------------------------------------
--step1:run the match process(check whether the request
-- match the name in the svcnames one by one)
-- and return the matched serice info
---------------------------------------------------------------
local matchedsvcname
local svcinfo
local svc_key = ""
--add by wangyg:20160418 special handler for refer
local matched_usingrefer = false
--end of add by wangyg:20160418 special handler for refer
for _, svcname in ipairs(svcnames) do
if (svcname == "/") then
svc_key = get_svckey_custom(svcname)
local svc_info,err = dbclient.load_serviceinfo(svc_key)
if svc_info and svc_isactive(svc_info)then
matchedsvcname = svcname
svcinfo = svc_info
break
end
end
local from, to, err = ngx.re.find(req_res, "^"..svcname.."(/(.*))?$", "jo")
--check whether svcname is the prefix of the req uri
if from then
svc_key = get_svckey_custom(svcname)
local svc_info,err = dbclient.load_serviceinfo(svc_key)
if svc_info and svc_isactive(svc_info) then
matchedsvcname = svcname
svcinfo = svc_info
break
end
else
--do nothing
end
end
---------------------------------------------------------------
--step1.1:additional process,test against the refer
-- similar to step1
---------------------------------------------------------------
--add by wangyg:20160418 special handler for refer
if not matchedsvcname and enablerefercheck then
local refer = ngx_var.http_referer
if(refer and refer~="") then
for _, svcname in ipairs(svcnames) do
local urlreg ="^(https://|http://|)(([1-9]|([1-9]\\d)|(1\\d\\d)|(2([0-4]\\d|5[0-5])))\\.)(([0-9]|([1-9]\\d)|(1\\d\\d)|(2([0-4]\\d|5[0-5])))\\.){2}([1-9]|([1-9]\\d)|(1\\d\\d)|(2([0-4]\\d|5[0-5])))(:\\d{1,5})?"..svcname.."(/(.*))?$";
local from, to, err = ngx.re.find(refer, urlreg, "jo")
----check whether svcname is the prefix of the req refer
if from then
svc_key = get_svckey_custom(svcname)
local svc_info,err = dbclient.load_serviceinfo(svc_key)
if svc_info and svc_isactive(svc_info) then
matchedsvcname = svcname
svcinfo = svc_info
matched_usingrefer = true
break
end
end
end
end
end
--end of add by wangyg:20160418 special handler for refer
if not matchedsvcname or tbl_isempty(svcinfo) then
error_svc_not_found("No route found for this request!","custom not match")
end
local svc_url = svc_get_url(svcinfo,svc_type)
---------------------------------------------------------------
--step2:rewrite the request uri using the svcinfo
---------------------------------------------------------------
local rewrited_uri =""
if (matchedsvcname == "/") then
--special handling: if "/" matched, contact directly
rewrited_uri = svc_url..req_res
else
--rewrited_uri = ngx.re.sub(req_res, "^"..matchedsvcname.."(.*)", svc_url.."$1", "o")
local newuri,n,err = ngx.re.sub(req_res, "^"..matchedsvcname.."(/.*)?", svc_url.."$1", "o")
--add by wangyg:20160418 special handler for refer
if(n==0 and matched_usingrefer) then newuri = svc_url..req_res end --special handling if matched using refer
--end of add by wangyg:20160418 special handler for refer
rewrited_uri = newuri
end
--if (rewrited_uri == "") then rewrited_uri = "/" end --avoid throws internal error when it is empty
if (rewrited_uri == "") then return ngx.redirect(ngx.var.uri.."/") end
ngx.req.set_uri(rewrited_uri)
--set the matched service info,used in the proxy_redirect directive
ngx_var.svc_name = matchedsvcname
ngx_var.svc_url = svc_url
--log the route info
log("matched",matchedsvcname)
if(matched_usingrefer) then log("matched_usingrefer",true) end
--log("rewrited_uri",rewrited_uri)
---------------------------------------------------------------
--step2.1:store the svcinfo in the context, plugins may use it
---------------------------------------------------------------
ngx_ctx.svcinfo = svcinfo
---------------------------------------------------------------
--step3:process the proxy upstream part
-- con1-using consul template:set the upstream name
-- con2-using msb balancer:query the backserver list and store in the ctx
---------------------------------------------------------------
--set the http_protocol used by proxy_pass directive
ngx_var.http_protocol = svc_get_backend_protocol(svcinfo)
if svc_use_own_upstream(svcinfo) then
local consul_servicename = svcinfo.spec["consulServiceName"]
if not consul_servicename or consul_servicename == "" then
error_upstream_not_found()
end
ngx_var.backend = consul_servicename
ngx.ctx.use_ownupstream = true
else
local backservers = svcinfo.spec.nodes
if tbl_isempty(backservers) then
error_svc_not_found("No active backend server found!","key--"..svc_key)
end
ngx_ctx.backservers = backservers
ngx_ctx.svc_key = svc_key
end
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