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# Licensed to the StackStorm, Inc ('StackStorm') under one or more |
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# contributor license agreements. See the NOTICE file distributed with |
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# this work for additional information regarding copyright ownership. |
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# The ASF licenses this file to You under the Apache License, Version 2.0 |
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# (the "License"); you may not use this file except in compliance with |
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# the License. You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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from st2common.constants.keyvalue import SYSTEM_SCOPE |
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from st2common.models.system.keyvalue import KeyReference |
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from st2common.persistence.keyvalue import KeyValuePair |
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__all__ = [ |
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'KeyValueLookup', |
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'get_key_reference', |
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] |
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class KeyValueLookup(object): |
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def __init__(self, key_prefix='', cache=None, scope=None): |
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self._key_prefix = key_prefix |
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self._scope = scope if scope else SYSTEM_SCOPE |
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if cache is None: |
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cache = {} |
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self._value_cache = cache |
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def __str__(self): |
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return self._value_cache[self._key_prefix] |
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def __getitem__(self, key): |
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return self._get(key) |
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def __getattr__(self, name): |
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return self._get(name) |
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def _get(self, name): |
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# get the value for this key and save in value_cache |
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key = KeyReference(name=name, prefix=self._key_prefix).ref |
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value = self._get_kv(key) |
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self._value_cache[key] = value |
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# return a KeyValueLookup as response since the lookup may not be complete e.g. if |
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# the lookup is for 'key_base.key_value' it is likely that the calling code, e.g. Jinja, |
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# will expect to do a dictionary style lookup for key_base and key_value as subsequent |
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# calls. Saving the value in cache avoids extra DB calls. |
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return KeyValueLookup(key_prefix=key, cache=self._value_cache, scope=self._scope) |
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def _get_kv(self, key): |
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scope = self._scope |
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kvp = KeyValuePair.get_by_scope_and_name(scope=scope, name=key) |
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# A good default value for un-matched value is empty string since that will be used |
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# for rendering templates. |
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return kvp.value if kvp else '' |
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def get_key_reference(name, scope, prefix): |
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""" |
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Given a key name, scope and prefix, this method returns a new name (string ref) |
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to address the key value pair in the context of that scope. |
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:param name: Original name of the key. |
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:type name: ``str`` |
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:param scope: Scope the key is under. |
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:type scope: ``str`` |
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:param prefix: Prefix to use for the key. |
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:type prefix: ``str`` |
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:rtype: ``str`` |
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""" |
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if scope == SYSTEM_SCOPE: |
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return KeyReference(name=name).ref |
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return KeyReference(name=name, prefix=prefix).ref |
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StackStorm /
st2
