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#!/usr/bin/env python3
"""
An example of keeping a history of cached responses, for later comparison or analysis
"""
from time import sleep
from requests_cache import CachedSession
class CachedHistorySession(CachedSession):
"""A CachedSession that keeps a copy of all previously cached responses"""
def send(self, *args, **kwargs):
"""Save a copy of every new response"""
response = super().send(*args, **kwargs)
if not response.from_cache:
self.cache.save_response(response, f'{response.cache_key}_{response.created_at}')
return response
def get_response_history(self, response):
"""Get a history of previously cached versions of the given response"""
return [
self.cache.responses[k]
for k in self.cache.responses.keys()
if k.startswith(response.cache_key) and k != response.cache_key
]
def demo():
session = CachedHistorySession(expire_after=1)
n_history_items = 3
for i in range(n_history_items):
response = session.get('https://httpbin.org/get')
if i < n_history_items - 1:
sleep(1)
for r in session.get_response_history(response):
print(r)
if __name__ == '__main__':
demo()
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