[Pythonmac-SIG] PyObjC and Criollo HTTP server

[Rand Dvorak]

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 <ronaldoussoren at mac.com> 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 <pythonmac-sig at python.org <mailto:pythonmac-sig at python.org>> 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 <randdvorak at gmail.com <mailto:randdvorak at gmail.com>> 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 <ronaldoussoren at mac.com <mailto:ronaldoussoren at mac.com>> wrote:
>>>> 
>>>> 
>>>> 
>>>>> On 6 Jan 2020, at 00:51, Rand Dvorak <randdvorak at gmail.com <mailto:randdvorak at gmail.com>> 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  -  Pythonmac-SIG at python.org <mailto:Pythonmac-SIG at python.org>
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>>>> 
>>> 
>> 
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