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# -*- coding: utf-8 -*- |
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import time |
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import threading |
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from collections import deque, namedtuple |
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from .injectors import ( |
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DirectPrefixInjector, StaticPrefixInjector, AutoprefixInjector, |
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HybrydPrefixInjector, |
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) |
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from .injectors import merge_injectors |
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StackItem = namedtuple('StackItem', ('injector', 'parent', )) |
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class InjectionLocalStack(threading.local): |
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def __init__(self): |
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self._container = deque() |
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super(InjectionLocalStack, self).__init__() |
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def push(self, item): |
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self._container.append(item) |
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def pop(self): |
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return self._container.pop() |
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@property |
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def top(self): |
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try: |
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return self._container[-1] |
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except IndexError: |
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return None |
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@property |
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def is_empty(self): |
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return not self._container |
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_stack = InjectionLocalStack() |
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class InjectionContext(object): |
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_old_enter_time = None |
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def __init__(self, injector, inherit=False): |
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if _stack.is_empty: |
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if callable(injector): |
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injector = injector() |
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self._push(injector) |
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elif inherit: |
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if callable(injector): |
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injector = injector() |
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injector = merge_injectors(_stack.top.injector, injector) |
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self._push(injector) |
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def _push(self, injector): |
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item = StackItem(injector, self) |
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_stack.push(item) |
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def __enter__(self): |
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inj = _stack.top.injector |
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self._old_enter_time, inj.enter_time = inj.enter_time, time.time() |
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return inj |
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def __exit__(self, exc_type, value, traceback): |
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item = _stack.top |
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inj = item.injector |
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inj.enter_time, self._old_enter_time = self._old_enter_time, None |
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if item.parent is self: |
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_stack.pop() |
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def direct_injector(prefix, inherit=False): |
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return InjectionContext( |
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lambda: DirectPrefixInjector(prefix), |
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inherit) |
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def static_injector(prefix, delimiter=None, inherit=False): |
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return InjectionContext( |
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lambda: StaticPrefixInjector(prefix, delimiter), |
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inherit) |
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def auto_injector(oid_generator=None, delimiter=None, inherit=False): |
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return InjectionContext( |
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lambda: AutoprefixInjector(oid_generator, delimiter), |
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inherit) |
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def hybrid_injector(prefix, oid_generator=None, delimiter=None, inherit=False): |
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return InjectionContext( |
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lambda: HybrydPrefixInjector(prefix, oid_generator, delimiter), |
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inherit) |
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oblalex /
isotopic-logging
