[Pythonmac-SIG] PyObjC and Criollo HTTP server
Rand Dvorak
randdvorak at gmail.com
Wed Jan 8 15:55:34 EST 2020
Here’s what I’ve got so far. I don’t know much about the metadata, but I did try gen_bridge_metadata to try and decipher it, but I think it doesn’t generate it correctly either.
import objc
CRApplication = objc.lookUpClass("CRApplication")
objc.registerMetaDataForSelector(
b'CRHTTPServer',
b'get:block:',
{
'arguments': {
3: { '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 8, 2020, at 15:41, Ronald Oussoren <ronaldoussoren at mac.com> wrote:
>
> What is the type of ‘server’?
>
> And I just noticed the metadata block is a bit of, the callable is argument 3 instead of 2.
>
> Ronald
>
> --
> On the road, hence brief.
>
>> On 8 Jan 2020, at 17:18, Rand Dvorak <randdvorak at gmail.com> wrote:
>>
>> 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 <ronaldoussoren at mac.com <mailto:ronaldoussoren at mac.com>> 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 <randdvorak at gmail.com <mailto: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/>
>>>>>>>>> _______________________________________________
>>>>>>>>> Pythonmac-SIG maillist - Pythonmac-SIG at python.org <mailto:Pythonmac-SIG at python.org>
>>>>>>>>> https://mail.python.org/mailman/listinfo/pythonmac-sig <https://mail.python.org/mailman/listinfo/pythonmac-sig>
>>>>>>>>> unsubscribe: https://mail.python.org/mailman/options/Pythonmac-SIG <https://mail.python.org/mailman/options/Pythonmac-SIG>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Pythonmac-SIG maillist - Pythonmac-SIG at python.org <mailto:Pythonmac-SIG at python.org>
>>>>>> https://mail.python.org/mailman/listinfo/pythonmac-sig <https://mail.python.org/mailman/listinfo/pythonmac-sig>
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>>>>>
>>>>
>>>
>>
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