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disposable_subscription_on_cancel()   A
last analyzed

↳ Parent: async_rx.protocol.subscription

Complexity

Conditions 3

Size

Total Lines 19
Code Lines 9

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
eloc 9
dl 0
loc 19
rs 9.95
c 0
b 0
f 0
cc 3
nop 2
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"""Subscription utilities."""
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from typing import Optional
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import curio

            


            
                                                                                                            
                            
            
                                    
            
            

                
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from .definition import Observable, Observer, Subscription

            


            
                                                                                                            
                            
            
                                    
            
            

                
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__all__ = ["default_subscription", "disposable_subscription_on_cancel"]

            


            
                                                                                                            
                            
            
                                    
            
            

                
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async def default_subscription() -> None:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """Default subcribe implementation method.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    Do nothing.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    Returns:

            


            
                                                                                                            
                            
            
                                    
            
            

                
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        (None) - nothing to return.

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    """

            


            
                                                                                                            
                            
            
                                    
            
            

                
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    pass

            


            
                                                                                                            
                            
            
                                    
            
            

                
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async def disposable_subscription_on_cancel(an_observable: Observable, an_observer: Observer) -> Optional[Subscription]:

            


            
                                                        
            
                                    
            
            

                
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    """Subscribe implementation wich dispose herself on cancel.

            


            
                                                        
            
                                    
            
            

                
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    Arguments:

            


            
                                                        
            
                                    
            
            

                
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        an_observable (Observable): observable

            


            
                                                        
            
                                    
            
            

                
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        an_observer (Observer): observer

            


            
                                                        
            
                                    
            
            

                
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    Returns:

            


            
                                                        
            
                                    
            
            

                
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        (Optional[Subscription]): the subscription if task is not cancelled

            


            
                                                        
            
                                    
            
            

                
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    """

            


            
                                                        
            
                                    
            
            

                
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    _subscription: Optional[Subscription] = None

            


            
                                                        
            
                                    
            
            

                
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    try:

            


            
                                                        
            
                                    
            
            

                
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        _subscription = await an_observable.subscribe(an_observer=an_observer)

            


            
                                                        
            
                                    
            
            

                
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    except curio.CancelledError:  # pragma: no cover

            


            
                                                        
            
                                    
            
            

                
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        if _subscription:

            


            
                                                        
            
                                    
            
            

                
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            await _subscription()

            


            
                                                        
            
                                    
            
            

                
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            _subscription = None

            


            
                                                        
            
                                    
            
            

                
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    return _subscription

            


            
                                                        
            
                                    
            
            

                
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