1347
+ − 1 from browser import window , aio
+ − 2 import javascript
+ − 3
+ − 4
+ − 5 class BridgeException ( Exception ):
+ − 6 """An exception which has been raised from the backend and arrived to the frontend."""
+ − 7
+ − 8 def __init__ ( self , name , message = "" , condition = "" ):
+ − 9 """
+ − 10
+ − 11 @param name (str): full exception class name (with module)
+ − 12 @param message (str): error message
+ − 13 @param condition (str) : error condition
+ − 14 """
+ − 15 Exception . __init__ ( self )
+ − 16 self . fullname = str ( name )
+ − 17 self . message = str ( message )
+ − 18 self . condition = str ( condition ) if condition else ""
+ − 19 self . module , __ , self . classname = str ( self . fullname ) . rpartition ( "." )
+ − 20
+ − 21 def __str__ ( self ):
+ − 22 message = ( ": %s " % self . message ) if self . message else ""
+ − 23 return self . classname + message
+ − 24
+ − 25 def __eq__ ( self , other ):
+ − 26 return self . classname == other
+ − 27
+ − 28
+ − 29 class Bridge :
+ − 30
+ − 31 def __getattr__ ( self , attr ):
+ − 32 return lambda * args , ** kwargs : self . call ( attr , * args , ** kwargs )
+ − 33
+ − 34 async def call ( self , method_name , * args , ** kwargs ):
+ − 35 data = javascript . JSON . stringify ({
+ − 36 "args" : args ,
+ − 37 "kwargs" : kwargs ,
+ − 38 })
+ − 39 url = f "/_bridge/ { method_name } "
+ − 40 r = await aio . post (
+ − 41 url ,
+ − 42 headers = {
+ − 43 'X-Csrf-Token' : window . csrf_token ,
+ − 44 },
+ − 45 data = data ,
+ − 46 )
+ − 47
+ − 48 if r . status == 200 :
+ − 49 return javascript . JSON . parse ( r . data )
+ − 50 elif r . status == 502 :
+ − 51 ret = javascript . JSON . parse ( r . data )
+ − 52 raise BridgeException ( ret [ 'fullname' ], ret [ 'message' ], ret [ 'condition' ])
+ − 53 else :
+ − 54 print ( f "bridge called failed: code: { r . status } , text: { r . statusText } " )
+ − 55 raise BridgeException ( "InternalError" , r . statusText )
