def middleware(method, params):
lock_acquired = lock.acquire(blocking=False)
try:
if lock_acquired and method in rpc_whitelist:
cache_key = generate_cache_key((method, params))
if cache_key in cache:
# check that the cached response is not expired.
cached_at, cached_response = cache[cache_key]
cached_for = time.time() - cached_at
if cached_for <= cache_expire_seconds:
return cached_response
else:
del cache[cache_key]
# cache either missed or expired so make the request.
response = make_request(method, params)
if should_cache_fn(method, params, response):
cache[cache_key] = (time.time(), response)
return response
else:
return make_request(method, params)
finally:
if lock_acquired:
lock.release()
def cache_class():
return {
generate_cache_key(('fake_endpoint', [1])): (
time.time() - 10,
{
'result': 'value-a'
},
),
}
def middleware(method, params):
lock_acquired = lock.acquire(blocking=False)
try:
if lock_acquired and method in rpc_whitelist:
cache_key = generate_cache_key((method, params))
if cache_key not in cache:
response = make_request(method, params)
if should_cache_fn(method, params, response):
cache[cache_key] = response
return response
return cache[cache_key]
else:
return make_request(method, params)
finally:
if lock_acquired:
lock.release()
def middleware(method, params):
lock_acquired = lock.acquire(blocking=False)
try:
should_try_cache = (
lock_acquired and method in rpc_whitelist
and not _is_latest_block_number_request(method, params))
if should_try_cache:
_update_block_info_cache()
latest_block_hash = block_info['latest_block']['hash']
cache_key = generate_cache_key(
(latest_block_hash, method, params))
if cache_key in cache:
return cache[cache_key]
response = make_request(method, params)
if should_cache_fn(method, params, response):
cache[cache_key] = response
return response
else:
return make_request(method, params)
finally:
if lock_acquired:
lock.release()
def cache_class():
return {
generate_cache_key(('fake_endpoint', [1])): {
'result': 'value-a'
},
}
def cache_class():
return {
generate_cache_key((current_block_hash, 'fake_endpoint', [1])): {
'result': 'value-a'
},
}
def test_key_generation_is_deterministic(value):
left = recursive_shuffle_dict(value)
right = recursive_shuffle_dict(value)
left_key = generate_cache_key(left)
right_key = generate_cache_key(right)
assert left_key == right_key
