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# ~*~ coding: utf-8 ~*~ |
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#- |
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# OSMAlchemy - OpenStreetMap to SQLAlchemy bridge |
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# Copyright (c) 2016 Dominik George <[email protected]> |
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# |
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# Permission is hereby granted, free of charge, to any person obtaining a copy |
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# of this software and associated documentation files (the "Software"), to deal |
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# in the Software without restriction, including without limitation the rights |
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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# copies of the Software, and to permit persons to whom the Software is |
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# furnished to do so, subject to the following conditions: |
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# |
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# The above copyright notice and this permission notice shall be included in all |
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# copies or substantial portions of the Software. |
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# |
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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# SOFTWARE. |
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# |
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# Alternatively, you are free to use OSMAlchemy under Simplified BSD, The |
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# MirOS Licence, GPL-2+, LGPL-2.1+, AGPL-3+ or the same terms as Python |
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# itself. |
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""" Trigger code for live OSMAlchemy/Overpass integration. """ |
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import datetime |
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from sqlalchemy import inspect |
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from sqlalchemy.event import listens_for |
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from sqlalchemy.orm import Query |
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from weakref import WeakSet |
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from .online import _get_single_element_by_id |
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from .util import _analyse_clause, _import_osm_xml |
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def _generate_triggers(osmalchemy, maxage=60*60*24): |
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""" Generates the triggers for online functionality. |
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osmalchemy - reference to the OSMAlchemy instance to be configured |
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maxage - maximum age of objects before they are updated online, in seconds |
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""" |
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_visited_queries = WeakSet() |
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@listens_for(Query, "before_compile") |
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def _query_compiling(query): |
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# Get the session associated with the query: |
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session = query.session |
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# Prevent recursion by skipping already-seen queries |
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if query in _visited_queries: |
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return |
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else: |
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_visited_queries.add(query) |
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# Check whether this query affects our model |
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affected_models = set([c["type"] for c in query.column_descriptions]) |
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our_models = set([osmalchemy.node, osmalchemy.way, osmalchemy.relation, |
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osmalchemy.element]) |
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if affected_models.isdisjoint(our_models): |
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# None of our models is affected |
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return |
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# Check whether this query filters elements |
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# Online update will only run on a specified set, not all data |
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if query.whereclause is None: |
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# No filters |
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return |
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# Analyse where clause looking for all looked-up fields |
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tree = {} |
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for target in our_models.intersection(affected_models): |
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tree[target.__name__] = _analyse_clause(query.whereclause, target) |
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Natureshadow /
OSMAlchemy
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