[Pythonmac-SIG] PyObjC and Criollo HTTP server

[Ronald Oussoren]

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/

> On 6 Jan 2020, at 23:59, Rand Dvorak <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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