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#!/usr/bin/env python
# Copyright 2018, Google LLC
# 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.
"""Demonstrates how to connect to Cloud Bigtable and run some basic operations.
# http://www.apache.org/licenses/LICENSE-2.0
Prerequisites:
- Create a Cloud Bigtable cluster.
https://cloud.google.com/bigtable/docs/creating-cluster
- Set your Google Application Default Credentials.
https://developers.google.com/identity/protocols/application-default-credentials
Operations performed:
- Create a Cloud Bigtable table.
- List tables for a Cloud Bigtable instance.
- Print metadata of the newly created table.
- Create Column Families with different GC rules.
- GC Rules like: MaxAge, MaxVersions, Union, Intersection and Nested.
- Delete a Bigtable table.
"""
import argparse
import datetime
from google.cloud import bigtable
from google.cloud.bigtable import column_family
def run_table_operations(project_id, instance_id, table_id):
''' Create a Bigtable table and perform basic table operations
:type project_id: str
:param project_id: Project id of the client.
:type instance_id: str
:param instance_id: Instance of the client.
:type table_id: str
:param table_id: Table id to create table.
'''
client = bigtable.Client(project=project_id, admin=True)
instance = client.instance(instance_id)
table = instance.table(table_id)
# Check whether table exists in an instance.
# Create table if it does not exists.
print 'Checking if table {} exists...'.format(table_id)
if table.exists():
print 'Table {} already exists.'.format(table_id)
else:
print 'Creating the {} table.'.format(table_id)
table.create()
print 'Created table {}.'.format(table_id)
# [START bigtable_list_tables]
tables = instance.list_tables()
print 'Listing tables in current project...'
if tables != []:
for tbl in tables:
print tbl.table_id
else:
print 'No table exists in current project...'
# [END bigtable_list_tables]
# [START bigtable_create_family_gc_max_age]
print 'Creating column family cf1 with with MaxAge GC Rule...'
# Create a column family with GC policy : maximum age
# where age = current time minus cell timestamp
# Define the GC rule to retain data with max age of 5 days
max_age_rule = column_family.MaxAgeGCRule(datetime.timedelta(days=5))
column_family1 = table.column_family('cf1', max_age_rule)
column_family1.create()
print 'Created column family cf1 with MaxAge GC Rule.'
# [END bigtable_create_family_gc_max_age]
# [START bigtable_create_family_gc_max_versions]
print 'Creating column family cf2 with max versions GC rule...'
# Create a column family with GC policy : most recent N versions
# where 1 = most recent version
# Define the GC policy to retain only the most recent 2 versions
max_versions_rule = column_family.MaxVersionsGCRule(2)
column_family2 = table.column_family('cf2', max_versions_rule)
column_family2.create()
print 'Created column family cf2 with Max Versions GC Rule.'
# [END bigtable_create_family_gc_max_versions]
# [START bigtable_create_family_gc_union]
print 'Creating column family cf3 with union GC rule...'
# Create a column family with GC policy to drop data that matches
# at least one condition.
# Define a GC rule to drop cells older than 5 days or not the
# most recent version
union_rule = column_family.GCRuleUnion([
column_family.MaxAgeGCRule(datetime.timedelta(days=5)),
column_family.MaxVersionsGCRule(2)])
column_family3 = table.column_family('cf3', union_rule)
column_family3.create()
print 'Created column family cf3 with Union GC rule'
# [END bigtable_create_family_gc_union]
# [START bigtable_create_family_gc_intersection]
print 'Creating column family cf4 with Intersection GC rule...'
# Create a column family with GC policy to drop data that matches
# all conditions
# GC rule: Drop cells older than 5 days AND older than the most
# recent 2 versions
intersection_rule = column_family.GCRuleIntersection([
column_family.MaxAgeGCRule(datetime.timedelta(days=5)),
column_family.MaxVersionsGCRule(2)])
column_family4 = table.column_family('cf4', intersection_rule)
column_family4.create()
print 'Created column family cf4 with Intersection GC rule.'
# [END bigtable_create_family_gc_intersection]
# [START bigtable_create_family_gc_nested]
print 'Creating column family cf5 with a Nested GC rule...'
# Create a column family with nested GC policies.
# Create a nested GC rule:
# Drop cells that are either older than the 10 recent versions
# OR
# Drop cells that are older than a month AND older than the
# 2 recent versions
rule1 = column_family.MaxVersionsGCRule(10)
rule2 = column_family.GCRuleIntersection([
column_family.MaxAgeGCRule(datetime.timedelta(days=30)),
column_family.MaxVersionsGCRule(2)])
nested_rule = column_family.GCRuleUnion([rule1, rule2])
column_family5 = table.column_family('cf5', nested_rule)
column_family5.create()
print 'Created column family cf5 with a Nested GC rule.'
# [END bigtable_create_family_gc_nested]
# [START bigtable_list_column_families]
print 'Printing Column Family and GC Rule for all column families...'
column_families = table.list_column_families()
for column_family_name, gc_rule in sorted(column_families.items()):
print 'Column Family:', column_family_name
print 'GC Rule:'
print gc_rule.to_pb()
# Sample output:
# Column Family: cf4
# GC Rule:
# gc_rule {
# intersection {
# rules {
# max_age {
# seconds: 432000
# }
# }
# rules {
# max_num_versions: 2
# }
# }
# }
# [END bigtable_list_column_families]
print 'Print column family cf1 GC rule before update...'
print 'Column Family: cf1'
print column_family1.to_pb()
# [START bigtable_update_gc_rule]
print 'Updating column family cf1 GC rule...'
# Update the column family cf1 to update the GC rule
column_family1 = table.column_family(
'cf1',
column_family.MaxVersionsGCRule(1))
column_family1.update()
print 'Updated column family cf1 GC rule\n'
# [END bigtable_update_gc_rule]
print 'Print column family cf1 GC rule after update...'
print 'Column Family: cf1'
print column_family1.to_pb()
# [START bigtable_delete_family]
print 'Delete a column family cf2...'
# Delete a column family
column_family2.delete()
print 'Column family cf2 deleted successfully.'
# [END bigtable_delete_family]
print 'execute command "python tableadmin.py delete [project_id] \
[instance_id] --table [tableName]" to delete the table.'
def delete_table(project_id, instance_id, table_id):
''' Delete bigtable.
:type project_id: str
:param project_id: Project id of the client.
:type instance_id: str
:param instance_id: Instance of the client.
:type table_id: str
:param table_id: Table id to create table.
'''
client = bigtable.Client(project=project_id, admin=True)
instance = client.instance(instance_id)
table = instance.table(table_id)
# [START bigtable_delete_table]
# Delete the entire table
print 'Checking if table {} exists...'.format(table_id)
if table.exists():
print 'Table {} exists.'.format(table_id)
print 'Deleting {} table.'.format(table_id)
table.delete()
print 'Deleted {} table.'.format(table_id)
else:
print 'Table {} does not exists.'.format(table_id)
# [END bigtable_delete_table]
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('command',
help='run or delete. \
Operation to perform on table.')
parser.add_argument(
'--table',
help='Cloud Bigtable Table name.',
default='Hello-Bigtable')
parser.add_argument('project_id',
help='Your Cloud Platform project ID.')
parser.add_argument(
'instance_id',
help='ID of the Cloud Bigtable instance to connect to.')
args = parser.parse_args()
if args.command.lower() == 'run':
run_table_operations(args.project_id, args.instance_id,
args.table)
elif args.command.lower() == 'delete':
delete_table(args.project_id, args.instance_id, args.table)
else:
print 'Command should be either run or delete.\n Use argument -h,\
--help to show help and exit.'
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