add the driver lua

Change-Id: I1d8b2adaaaae25a0990530fc48a497f9c201da4a
Signed-off-by: zhouruiyu <zhouruiyu@huawei.com>

diff --git a/msb-core/openresty-ext/src/assembly/resources/openresty/nginx/luaext/plugins/driver_manager.lua b/msb-core/openresty-ext/src/assembly/resources/openresty/nginx/luaext/plugins/driver_manager.lua
index d337a25..4caa9e2 100644 (file)
--- a/msb-core/openresty-ext/src/assembly/resources/openresty/nginx/luaext/plugins/driver_manager.lua
+++ b/msb-core/openresty-ext/src/assembly/resources/openresty/nginx/luaext/plugins/driver_manager.lua
@@ -17,11 +17,98 @@
 ]]
 local _M = {}
 _M._VERSION = '1.0.0'
+local _HEADER = "X-Driver-Parameter"
+
+--extract driver header if present in request
+local function get_driver_header()
+  local header = ""
+  local driver_header = ngx.req.get_headers()[_HEADER]  
+  if (driver_header ~= nil)
+  then
+    header = driver_header
+  end
+  return header
+end
+
+-- generate query url
+local function get_query_url(x_driver_header)
+  local drivermgr_uri = '/openoapi/drivermgr/v1/drivers'
+  local url = drivermgr_uri.."?".._HEADER.."="..tostring(ngx.escape_uri(x_driver_header)).."&service_url="..ngx.var.uri
+  return url
+end
+
+-- generate driver url
+local function get_driver_url(driver_header)
+  local cjson = require "cjson"
+  local query_url = get_query_url(driver_header)
+  local res = ngx.location.capture(query_url, { method = ngx.HTTP_GET})
+  ngx.log (ngx.ERR, "Driver manager resp url : ", tostring(res.body))
+  if (res.status == 200 and res.body ~= nil and res.body ~= '')
+  then
+    return tostring(cjson.new().decode(res.body).url)
+  else
+    return ''
+  end
+end
+
+-- get headers
+local function get_headers()
+  local headers = {}
+  local h = ngx.req.get_headers()
+  for k, value in pairs(h)
+  do
+     headers[k] = value
+  end
+  return headers
+end
+
+local function get_body_params()
+  ngx.req.read_body()
+  local actual_body = ""  
+  local body_param = ngx.req.get_body_data()
+  if(body_param ~= nil)
+  then
+    actual_body = tostring(body_param)
+  end
+  return actual_body
+end
 
 function _M.access()
-       ngx.log(ngx.INFO, "running driver_manager plugin")
-       --add your own code here
-       --choose the right backend server,and then tell nginx, e.g. ngx.var.backend = XX.XX.XX.XX:8888
+    ngx.log(ngx.ERR, "DRIVER MANAGER LUA", "***********************")
+
+    -- extract X-Driver-Parameter header param
+    local driver_header = get_driver_header()
+    ngx.log(ngx.ERR, "X-Driver-Parameter: ", driver_header)
+
+
+    -- ignore driver redirection if not driver manager request.
+    if (driver_header ~= "")
+    then 
+      
+      local driver_url = get_driver_url(driver_header)
+      ngx.log (ngx.ERR, "Driver manager URl:: ", driver_url)
+     
+      local http = require "resty.http"
+      local actual_headers = get_headers()
+      local actual_body = get_body_params()
+
+      ngx.log(ngx.ERR, "HTTP request to driver... ", " Request to driver manager")
+      local res, err = http.new():request_uri(driver_url, {
+            method = ngx.req.get_method(),
+            body = actual_body,
+            headers = actual_headers
+          })
+
+          if not res then
+            ngx.say("Request to driver failed : ", err)
+            return
+          end
+     ngx.log(ngx.ERR, "Response from driver : ", tostring(res.body))
+     ngx.say(res.body)
+
+    else
+      ngx.log(ngx.ERR, "X-Driver-Parameter not present", " Redirect to same url")
+    end
 end
 
 return _M
\ No newline at end of file