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#
# -------------------------------------------------------------------------
# Copyright (c) 2015-2017 AT&T Intellectual Property
#
# 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 time
from oslo_config import cfg
from conductor.common import db_backend
from conductor import service
CONF = cfg.CONF
def current_time_millis():
"""Current time in milliseconds."""
return int(round(time.time() * 1000))
def main():
"""Sample usage of Music."""
service.prepare_service()
CONF.set_override('debug', True, 'music_api')
CONF.set_override('mock', True, 'music_api')
CONF.set_override('hostnames', ['music2'], 'music_api')
music = db_backend.get_client()
print("Music version %s" % music.version())
# Randomize the name so that we don't step on each other.
keyspace = 'NewVotingApp' + str(current_time_millis() / 100)
music.keyspace_create(keyspace)
# Create the table
kwargs = {
'keyspace': keyspace,
'table': 'votecount',
'schema': {
'name': 'text',
'count': 'varint',
'PRIMARY KEY': '(name)'
}
}
music.table_create(**kwargs)
# Candidate data
data = {
'Joe': 5,
'Shankar': 7,
'Gueyoung': 8,
'Matti': 2,
'Kaustubh': 0
}
# Create an entry in the voting table for each candidate
# and with a vote count of 0.
kwargs = {'keyspace': keyspace, 'table': 'votecount', 'pk_name': 'name'}
for name in data: # We only want the keys
kwargs['pk_value'] = name
kwargs['values'] = {'name': name, 'count': 0}
music.row_create(**kwargs)
# Update each candidate's count atomically.
kwargs = {'keyspace': keyspace, 'table': 'votecount', 'pk_name': 'name'}
for name in data:
count = data[name]
kwargs['pk_value'] = name
kwargs['values'] = {'count': count}
kwargs['atomic'] = True
music.row_update(**kwargs)
# Read all rows
kwargs = {'keyspace': keyspace, 'table': 'votecount'}
print(music.row_read(**kwargs)) # Reads all rows
# Delete Joe, read Matti
kwargs = {'keyspace': keyspace, 'table': 'votecount', 'pk_name': 'name'}
kwargs['pk_value'] = 'Joe'
music.row_delete(**kwargs)
kwargs['pk_value'] = 'Matti'
print(music.row_read(**kwargs))
# Read all rows again
kwargs = {'keyspace': keyspace, 'table': 'votecount'}
print(music.row_read(**kwargs)) # Reads all rows
# Cleanup.
music.keyspace_delete(keyspace)
if __name__ == "__main__":
main()
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