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Fix unused imports, break out cache retrieval from try block

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Completed switch from dict → tuple for output & status by stringifying the output tuple, then using literal_eval to de-stringify on retrieval
This commit is contained in:
Matt Love
2019-07-08 00:23:02 -07:00
parent 2b5105f872
commit 65de869517
1 changed files with 20 additions and 21 deletions
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35
hyperglass/hyperglass.py
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@@ -3,6 +3,7 @@ Main Hyperglass Front End
"""
# Standard Imports
import json
from ast import literal_eval
# Module Imports
import redis
@@ -192,37 +193,35 @@ def hyperglass_main():
cache_timeout = params.features.cache.timeout
logger.debug(f"Cache Timeout: {cache_timeout}")
# Check if cached entry exists
if not r_cache.hgetall(cache_key):
if not r_cache.get(cache_key):
try:
logger.debug(f"Sending query {cache_key} to execute module...")
cache_value = Execute(lg_data).response()
value_output = cache_value["output"]
value_code = cache_value["status"]
logger.debug(
f"Validated response...\nStatus Code: {value_code}\nOutput:\n{value_output}"
f"Validated response...\nStatus Code: {cache_value[1]}\nOutput:\n{cache_value[0]}"
)
# If it doesn't, create a cache entry
r_cache.hmset(cache_key, cache_value)
r_cache.set(cache_key, str(cache_value))
r_cache.expire(cache_key, cache_timeout)
logger.debug(f"Added cache entry for query: {cache_key}")
response = r_cache.hgetall(cache_key)
logger.debug(f"Status code: {value_code}")
except:
logger.error(f"Unable to add output to cache: {cache_key}")
raise HyperglassError(f"Error with cache key {cache_key}")
# If it does, return the cached entry
logger.debug(f"Cache match for: {cache_key}, returning cached entry")
cache_response = r_cache.get(cache_key)
response = literal_eval(cache_response)
response_output, response_status = response
logger.debug(f"Cache Output: {response_output}")
logger.debug(f"Cache Status Code: {response_status}")
# If error, increment Prometheus metrics
if value_code in [405, 415, 504]:
if response_status in [405, 415, 504]:
count_errors.labels(
response["status"],
code.get_reason(response["status"]),
response_status,
code.get_reason(response_status),
client_addr,
lg_data["type"],
lg_data["location"],
lg_data["target"],
).inc()
return Response(*response)
except:
logger.error(f"Unable to add output to cache: {cache_key}")
raise HyperglassError(f"Error with cache key {cache_key}")
# If it does, return the cached entry
else:
logger.debug(f"Cache match for: {cache_key}, returning cached entry")
response = r_cache.hgetall(cache_key)
return Response(*response)