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# Copyright (C) 2018 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. 

 

 

import logging 

 

import grpc 

 

from buildgrid._exceptions import InvalidArgumentError 

from buildgrid._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remote_execution_pb2_grpc 

from buildgrid.server._authentication import AuthContext, authorize 

 

 

class CapabilitiesService(remote_execution_pb2_grpc.CapabilitiesServicer): 

 

def __init__(self, server): 

self.__logger = logging.getLogger(__name__) 

 

self.__instances = {} 

 

remote_execution_pb2_grpc.add_CapabilitiesServicer_to_server(self, server) 

 

# --- Public API --- 

 

def add_instance(self, name, instance): 

self.__instances[name] = instance 

 

def add_cas_instance(self, name, instance): 

self.__instances[name].add_cas_instance(instance) 

 

def add_action_cache_instance(self, name, instance): 

self.__instances[name].add_action_cache_instance(instance) 

 

def add_execution_instance(self, name, instance): 

self.__instances[name].add_execution_instance(instance) 

 

# --- Public API: Servicer --- 

 

@authorize(AuthContext) 

def GetCapabilities(self, request, context): 

"""Handles GetCapabilitiesRequest messages. 

 

Args: 

request (GetCapabilitiesRequest): The incoming RPC request. 

context (grpc.ServicerContext): Context for the RPC call. 

""" 

self.__logger.debug("GetCapabilities request from [%s]", context.peer()) 

 

try: 

instance = self._get_instance(request.instance_name) 

 

return instance.get_capabilities() 

 

except InvalidArgumentError as e: 

self.__logger.error(e) 

context.set_details(str(e)) 

context.set_code(grpc.StatusCode.INVALID_ARGUMENT) 

 

return remote_execution_pb2.ServerCapabilities() 

 

# --- Private API --- 

 

def _get_instance(self, name): 

try: 

return self.__instances[name] 

 

except KeyError: 

raise InvalidArgumentError("Instance doesn't exist on server: [{}]".format(name))