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# Copyright (C) 2019 Bloomberg LP 

# 

# Licensed under the Apache License, Version 2.0 (the "License"); 

# you may not use this file except in compliance with the License. 

# You may obtain a copy of the License at 

# 

# <http://www.apache.org/licenses/LICENSE-2.0> 

# 

# Unless required by applicable law or agreed to in writing, software 

# distributed under the License is distributed on an "AS IS" BASIS, 

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 

# See the License for the specific language governing permissions and 

# limitations under the License. 

 

""" 

Remote Action Cache 

=================== 

 

Provides an interface to a remote Action Cache. This is used by Execution 

services to communicate with remote caches. 

 

""" 

 

import logging 

 

from buildgrid._exceptions import NotFoundError 

from buildgrid.client.actioncache import ActionCacheClient 

from buildgrid.client.capabilities import CapabilitiesInterface 

 

 

class RemoteActionCache: 

 

def __init__(self, channel, instance_name): 

self.__logger = logging.getLogger(__name__) 

self.channel = channel 

self.instance_name = instance_name 

self._allow_updates = None 

self._action_cache = ActionCacheClient( 

self.channel, instance=self.instance_name) 

 

@property 

def allow_updates(self): 

# Check if updates are allowed if we haven't already. 

# This is done the first time update_action_result is called rather 

# than on instantiation because the remote cache may not be running 

# when this object is instantiated. 

if self._allow_updates is None: 

interface = CapabilitiesInterface(self.channel) 

capabilities = interface.get_capabilities(self.instance_name) 

self._allow_updates = (capabilities 

.cache_capabilities 

.action_cache_update_capabilities 

.update_enabled) 

return self._allow_updates 

 

def get_action_result(self, action_digest): 

action_result = self._action_cache.get(action_digest) 

 

if action_result is None: 

key = self._get_key(action_digest) 

raise NotFoundError("Key not found: {}".format(key)) 

return action_result 

 

def update_action_result(self, action_digest, action_result): 

if not self.allow_updates: 

raise NotImplementedError("Updating cache not allowed") 

return self._action_cache.update(action_digest, action_result) 

 

def _get_key(self, action_digest): 

return (action_digest.hash, action_digest.size_bytes)