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# -*- coding: utf-8 -*- |
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from collections import deque, namedtuple |
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from threading import local |
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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 InjectionStack(object): |
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def __init__(self, local): |
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local.stack = deque() |
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self._local = local |
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def push(self, item): |
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self._local.stack.append(item) |
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def pop(self): |
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return self._local.stack.pop() |
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@property |
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def top(self): |
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try: |
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return self._local.stack[-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._local.stack |
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_local = local() |
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_stack = InjectionStack(_local) |
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class InjectionContext(object): |
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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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return _stack.top.injector |
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def __exit__(self, type, value, traceback): |
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if _stack.top.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
