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* Retrieve and process summary or full ledgers. * Search using arbitrary criteria (any Python function). * Search using arbitrary formats (any Python function). * Caches ledgers as .gz files to avoid repeated server requests. * Handles ledger numbers, ranges, and special names like validated or closed.
34 lines
981 B
Python
34 lines
981 B
Python
from __future__ import absolute_import, division, print_function, unicode_literals
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import json
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import gzip
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import os
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_NONE = object()
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def file_cache(filename_prefix, creator, open=gzip.open, suffix='.gz'):
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"""A two-level cache, which stores expensive results in memory and on disk.
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"""
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cached_data = {}
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if not os.path.exists(filename_prefix):
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os.makedirs(filename_prefix)
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def get_file_data(name):
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filename = os.path.join(filename_prefix, str(name)) + suffix
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if os.path.exists(filename):
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return json.load(open(filename))
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result = creator(name)
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json.dump(result, open(filename, 'w'))
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return result
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def get_data(name, use_file_cache=True):
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result = cached_data.get(name, _NONE)
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if result is _NONE:
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maker = get_file_data if use_file_cache else creator
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result = maker(name)
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cached_data[name] = result
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return result
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return get_data
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