Re: PyObjC and Criollo HTTP server

Same result:

  File "main.py", line 40, in <module>
    server.get_block_("/", helloHandler)
TypeError: Argument 3 is a block, but no signature available


> On Jan 8, 2020, at 03:20, Ronald Oussoren <[email protected]> wrote:
> 
> Please change “get_block_” to “get:block:” in the call to objc.registerMetadataForSelector.
> 
> Ronald
> —
> 
> Twitter: @ronaldoussoren
> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
> 
>> On 8 Jan 2020, at 02:04, Rand Dvorak <[email protected] <mailto:[email protected]>> wrote:
>> 
>> Same results with this code:
>> 
>> import objc 
>> CRApplication = objc.lookUpClass("CRApplication")
>> objc.registerMetaDataForSelector(
>> 	b'CRServer',
>> 	b'get_block_',
>> 	{
>> 	'arguments': {
>> 		2: {
>> 			'callable': {
>> 			'arguments': {
>> 			0:{'type': b'^v'},
>> 			1:{'type': b'@'},
>> 			2:{'type': b'@'},
>> 			3:{'type': b'?'}
>> 			},
>> 		'	retval': { 'type': b'v' }
>> 			} 
>> 		}
>> 	}
>> 	}
>> )
>> 
>> global server
>> 
>> 	
>> def helloHandler(request, response, handler):
>> 	response.send_("Hello World!")
>> 	handler()
>> 	
>> if __name__ == "__main__":
>> 	server = CRApplication.sharedApplication().delegate().server()
>> 	server.get_block_("/", helloHandler)
>> 	server.startListening()
>> 
>> 
>>> On Jan 7, 2020, at 04:47, Ronald Oussoren <[email protected] <mailto:[email protected]>> wrote:
>>> 
>>> And given de example on https://criollo.io: <https://criollo.io/>
>>> 
>>> - The class name is CRServer, not CRApplication
>>> - The selector is “get:block:” instead of “get_block:”, which also means the block is argument 3 instead of 2.
>>> 
>>>>> objc.registerMetaDataForSelector(
>>>>> 	b'CRServer',
>>>>> 	b’get:block:',
>>>>> 	{
>>>>> 	'arguments': {
>>>>> 		3: {
>>>>> 			'callable': {
>>>>> 			'arguments': {
>>>>> 			0:{'type': b'^v'},
>>>>> 			1:{'type': b'@'},
>>>>> 			2:{'type': b'@'},
>>>>> 			3:{'type': b'@'}
>>>>> 			},
>>>>> 			'retval': { 'type': b'v' }
>>>>> 			} 
>>>>> 		}
>>>>> 	}
>>>>> 	}
>>>>> )
>>> 
>>> and later:
>>> 
>>>>> 	server.get_block_("/", helloHandler)
>>> 
>>>> 
>>> 
>>> 
>>> —
>>> 
>>> Twitter: @ronaldoussoren
>>> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
>>> 
>>>> On 7 Jan 2020, at 10:00, Ronald Oussoren via Pythonmac-SIG <[email protected] <mailto:[email protected]>> wrote:
>>>> 
>>>> Hi,
>>>> 
>>>> You also need to remove the call to objc.selector. With correct metadata “blocks” are callables in Python code.
>>>> 
>>>> Ronald
>>>> —
>>>> 
>>>> Twitter: @ronaldoussoren
>>>> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
>>>> 
>>>>> On 6 Jan 2020, at 23:59, Rand Dvorak <[email protected] <mailto:[email protected]>> wrote:
>>>>> 
>>>>> Same result:
>>>>> 
>>>>> Updated code:
>>>>> 
>>>>> import objc 
>>>>> CRApplication = objc.lookUpClass("CRApplication")
>>>>> objc.registerMetaDataForSelector(
>>>>> 	b'CRApplication',
>>>>> 	b'get_block_',
>>>>> 	{
>>>>> 	'arguments': {
>>>>> 		2: {
>>>>> 			'callable': {
>>>>> 			'arguments': {
>>>>> 			0:{'type': b'^v'},
>>>>> 			1:{'type': b'@'},
>>>>> 			2:{'type': b'@'},
>>>>> 			3:{'type': b'@'}
>>>>> 			},
>>>>> 		'	retval': { 'type': b'v' }
>>>>> 			} 
>>>>> 		}
>>>>> 	}
>>>>> 	}
>>>>> )
>>>>> global server
>>>>> 
>>>>> def helloHandler(self, request, response, handler):
>>>>> 	response.send_("Hello World!")
>>>>> 	handler()
>>>>> 	
>>>>> if __name__ == "__main__":
>>>>> 	server = CRApplication.sharedApplication().delegate().server()
>>>>> 	server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@@'))
>>>>> 	server.startListening()
>>>>> 
>>>>> 
>>>>> results:
>>>>> 
>>>>> Traceback (most recent call last):
>>>>>   File "main.py", line 37, in <module>
>>>>>     server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@@'))
>>>>> TypeError: Argument 3 is a block, but no signature available
>>>>> 
>>>>> 
>>>>>> On Jan 6, 2020, at 09:27, Ronald Oussoren <[email protected] <mailto:[email protected]>> wrote:
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>>> On 6 Jan 2020, at 00:51, Rand Dvorak <[email protected] <mailto:[email protected]>> wrote:
>>>>>>> 
>>>>>>> 
>>>>>>> I am trying to implement a simple server in PyObjC for the Criollo HTTP server.  The server has a method to set route handlers by passing a block to setup the route and then when it receives and HTTP request for the route it calls the block.  The block has the signature:
>>>>>>> 
>>>>>>> typedef void(^CRRouteBlock)(CRRequest* _Nonnull request, CRResponse* _Nonnull response, CRRouteCompletionBlock _Nonnull completionHandler);
>>>>>>> 
>>>>>>> 
>>>>>>> So, here is my simple proof of concept:
>>>>>>> 
>>>>>>> import objc 
>>>>>>> CRApplication = objc.lookUpClass("CRApplication")
>>>>>>> global server
>>>>>>> 
>>>>>>> def helloHandler(self, request, response, handler):
>>>>>>> 	response.send_("Hello World!")
>>>>>>> 	handler()
>>>>>>> 	
>>>>>>> if __name__ == "__main__":
>>>>>>> 	server = CRApplication.sharedApplication().delegate().server()
>>>>>>> 	server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@@‘))  *** error occurs here
>>>>>>> 	server.startListening()
>>>>>>> 
>>>>>>> 
>>>>>>> But, when I try to setup the route I get the following error:
>>>>>>> 
>>>>>>> Traceback (most recent call last):
>>>>>>> File "main.py", line 21, in <module>
>>>>>>>   server.get_block_("/", objc.selector(helloHandler, signature=b'v@:@@'))
>>>>>>> TypeError: Argument 3 is a block, but no signature available
>>>>>>> 
>>>>>>> 
>>>>>>> Any ideas how to workaround this issue and implement the route handlers in PyObjC?
>>>>>> 
>>>>>> The code below should do the trick, but eas typed directly into this mail and might therefore contain syntax errors.
>>>>>> 
>>>>>> import objc
>>>>>> objc.registerMetaDataForSelector(
>>>>>>    b”CRApplication”,  # name of the class implementing “get_block:”, or “NSObject”
>>>>>>    b”get_block:”,
>>>>>>   {
>>>>>>     “arguments”: {
>>>>>>       2: {
>>>>>>         “callable”: {
>>>>>>          “arguments”: {
>>>>>>           0: { “type”: b”^v” },
>>>>>>           1: { “type”: b”@” },
>>>>>>           2: { “type”: b”@” },
>>>>>>           3: { “type”: b”@” }
>>>>>>          },
>>>>>>          “retail”: { “type”: b”v” }
>>>>>>        } 
>>>>>>      }
>>>>>>   }
>>>>>> )
>>>>>> 
>>>>>> This tells the bridge the signature for the block argument of the “get_block:” selector, which is information that cannot be retrieved from the Objective-C runtime.  Argument 2 is the first real argument of ObjC selectors, after the implicit arguments “self” and “_imp” (which is not available in python code).
>>>>>> 
>>>>>> Ronald
>>>>>> —
>>>>>> 
>>>>>> Twitter: @ronaldoussoren
>>>>>> Blog: https://blog.ronaldoussoren.net/ <https://blog.ronaldoussoren.net/>
>>>>>>> _______________________________________________
>>>>>>> Pythonmac-SIG maillist  -  [email protected] <mailto:[email protected]>
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>>>>>> 
>>>>> 
>>>> 
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>>> 
>> 
>

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