provides.py

# 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 json

from charms.reactive import RelationBase
from charms.reactive import hook
from charms.reactive import scopes


class DFSProvides(RelationBase):
    scope = scopes.UNIT

    @hook('{provides:dfs}-relation-joined')
    def joined(self):
        conv = self.conversation()
        conv.set_state('{relation_name}.clients')

    @hook('{provides:dfs}-relation-departed')
    def departed(self):
        conv = self.conversation()
        conv.remove_state('{relation_name}.clients')

    def send_spec(self, spec):
        for conv in self.conversations():
            conv.set_remote('spec', json.dumps(spec, sort_keys=True))

    def send_clustername(self, clustername):
        for conv in self.conversations():
            conv.set_remote('clustername', clustername)

    def send_namenodes(self, namenodes):
        for conv in self.conversations():
            conv.set_remote(data={
                'namenodes': json.dumps(sorted(namenodes)),
            })

    def send_ports(self, port, webhdfs_port):
        for conv in self.conversations():
            conv.set_remote(data={
                'port': port,
                'webhdfs-port': webhdfs_port,
            })

    def send_ready(self, ready=True):
        for conv in self.conversations():
            conv.set_remote('has_slave', ready)

    def send_hosts_map(self, hosts_map):
        for conv in self.conversations():
            conv.set_remote(data={
                'etc_hosts': json.dumps(hosts_map, sort_keys=True),
            })