[Pythonmac-SIG] PyObjC and Criollo HTTP server

[Ronald Oussoren]

Please change “get_block_” to “get:block:” in the call to objc.registerMetadataForSelector.

Ronald
—

Twitter: @ronaldoussoren
Blog: https://blog.ronaldoussoren.net/

> On 8 Jan 2020, at 02:04, Rand Dvorak <randdvorak at gmail.com> 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 <ronaldoussoren at mac.com <mailto: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/>
>>>>>> _______________________________________________
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>>>>> 
>>>> 
>>> 
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>> 
> 

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