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| # Copyright (c) 2015, Arista Networks, Inc. | ||
| # All rights reserved. | ||
| # | ||
| # Redistribution and use in source and binary forms, with or without | ||
| # modification, are permitted provided that the following conditions are | ||
| # met: | ||
| # | ||
| # Redistributions of source code must retain the above copyright notice, | ||
| # this list of conditions and the following disclaimer. | ||
| # | ||
| # Redistributions in binary form must reproduce the above copyright | ||
| # notice, this list of conditions and the following disclaimer in the | ||
| # documentation and/or other materials provided with the distribution. | ||
| # | ||
| # Neither the name of Arista Networks nor the names of its | ||
| # contributors may be used to endorse or promote products derived from | ||
| # this software without specific prior written permission. | ||
| # | ||
| # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | ||
| # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ARISTA NETWORKS | ||
| # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | ||
| # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | ||
| # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | ||
| # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | ||
| # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE | ||
| # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN | ||
| # IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| # | ||
| ''' | ||
| Allocates a resource from a prefilled sqlite database. The database | ||
| is defined by the global variable, 'DB_URL' below. The database | ||
| can include multiple tables, but the value passed into the | ||
| 'sqlite(table)' will be used to look for an available resource. | ||
|
|
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| Table structure should be as follows: | ||
|
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||
| --------------------- | ||
| | node_id | key | | ||
| --------------------- | ||
| | NULL | 1.1.1.1 | | ||
| | NULL | 1.1.1.2 | | ||
| | NULL | 1.1.1.3 | | ||
| --------------------- | ||
|
|
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| Which can be created with statements like: | ||
|
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| CREATE TABLE `mgmt_subnet`(key TEXT, node_id TEXT) | ||
|
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| and add entries with: | ||
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| INSERT INTO `mgmt_subnet` VALUES('1.1.1.1', NULL) | ||
|
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| When a resource is added, the node_id row will be updated | ||
| to include the System ID from the switch. | ||
|
|
||
| -------------------------- | ||
| | node_id | key | | ||
| -------------------------- | ||
| | 001122334455 | 1.1.1.1 | | ||
| | NULL | 1.1.1.2 | | ||
| | NULL | 1.1.1.3 | | ||
| -------------------------- | ||
|
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||
| On subsequent attempts to allocate the resource to the same node, | ||
| ztpserver will first check to see whether the node has already been | ||
| allocated a resource from the pool. If it has, it will reuse the | ||
| resource instead of allocating a new one. | ||
|
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||
| Definition example: | ||
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| actions: | ||
| - | ||
| action: add_config | ||
| attributes: | ||
| url: files/templates/ma1.templates | ||
| variables: | ||
| ipaddress: sqlite('mgmt_subnet') | ||
| name: "configure ma1" | ||
| ''' | ||
|
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| import logging | ||
| import os | ||
| import sqlite3 as lite | ||
|
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| log = logging.getLogger('ztpserver') #pylint: disable=C0103 | ||
|
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| # SQLITE VARIABLES | ||
| DB_URL = "/usr/share/ztpserver/db/resources.db" | ||
|
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|
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| def check_url_valid(url): | ||
|
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| if not url.startswith('http'): | ||
| log.info('checking sqlite db (%s) exists...' % DB_URL) | ||
| if not os.path.isfile(url): | ||
| raise Exception('Specified DB file %s does not exists.' | ||
| % url) | ||
|
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|
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| def assign_resource(node_id, table): | ||
|
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| # Proactively check if the db file exists | ||
| check_url_valid(DB_URL) | ||
|
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| log.info('%s: looking for resources in sqlite DB(%s) in table(%s)' | ||
| % (node_id, DB_URL, table)) | ||
|
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| #Setup connection to local sqlite database | ||
| con = lite.connect(DB_URL) | ||
|
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||
| with con: | ||
| cur = con.cursor() | ||
|
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| query = "SELECT * FROM `%s` WHERE node_id='%s'" % (table, node_id) | ||
|
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| log.debug('%s: executing sql query:%s' % (node_id, query)) | ||
| match = cur.execute(query).fetchone() | ||
|
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| if match: | ||
| log.debug('%s: already allocated:%s in table %s' | ||
| % (node_id, match[0], table)) | ||
| return match[0] | ||
| else: | ||
| log.info('%s: no existing resources matches this node ' | ||
| 'in the db. Looking for new resource in %s' | ||
| % (node_id, table)) | ||
|
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||
| # The query must use subquery since sqlite is not | ||
| # typically compiled with LIMIT support for UPDATE | ||
| query = """UPDATE `%s` | ||
| SET node_id = '%s' | ||
| WHERE key IN ( | ||
| SELECT key | ||
| FROM `%s` | ||
| WHERE node_id IS NULL | ||
| ORDER BY rowid ASC | ||
| LIMIT 1 | ||
| )""" % (table, node_id, table) | ||
| log.debug('%s: executing query: %s' % (node_id, query)) | ||
| assigned = cur.execute(query).fetchone() | ||
| log.debug('%s: number of rows affected:%s' % | ||
| (node_id, cur.rowcount)) | ||
|
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||
| if cur.rowcount == 1: | ||
| # Go get the resouce that was just allocated | ||
| query = "SELECT * FROM `%s` WHERE node_id='%s'" % (table, node_id) | ||
| log.debug('%s: executing sql query:%s' % (node_id, query)) | ||
| match = cur.execute(query).fetchone() | ||
| return match[0] | ||
|
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|
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| def main(node_id, table): | ||
| try: | ||
| key = assign_resource(node_id, table) | ||
| log.debug('%s: assigned resource from \'%s\': %s' % | ||
| (node_id, table, key)) | ||
|
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| except Exception as exc: | ||
| msg = '%s: failed to allocate resource from \'%s\'' % \ | ||
| (node_id, table) | ||
| log.error(msg) | ||
| raise Exception('%s : %s' % (msg, exc.message)) | ||
|
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| return str(key) |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,40 @@ | ||
| #!/usr/bin/python | ||
| # -*- coding: utf-8 -*- | ||
|
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| import sqlite3 as lite | ||
| import sys | ||
|
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| con = lite.connect('/usr/share/ztpserver/db/resources.db') | ||
|
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| with con: | ||
|
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| for table in ['mgmt_subnet', 'tor_hostnames', 'ip_vlan100', 'ip_loopback']: | ||
| print "Working on: ",table | ||
| cur = con.cursor() | ||
| sql = "DROP TABLE IF EXISTS `%s`" % table | ||
| cur.execute(sql) | ||
| sql = "CREATE TABLE `%s`(key TEXT, node_id TEXT)" % table | ||
| cur.execute(sql) | ||
| if table == "mgmt_subnet": | ||
| base = "172.16.130." | ||
| subnet = "/24" | ||
| elif table == "tor_hostnames": | ||
| base = "veos-dc1-pod1-tor" | ||
| subnet = "" | ||
| elif table == "ip_vlan100": | ||
| base = "10.100.1." | ||
| subnet = "/24" | ||
| elif table == "ip_loopback": | ||
| base = "1.1.1." | ||
| subnet = "/32" | ||
|
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| for x in range(1,500): | ||
| sql = "INSERT INTO %s VALUES('%s%s%s',NULL)" % (table, base, str(x), subnet) | ||
| cur.execute(sql) | ||
|
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| sql = "SELECT * FROM `%s`" % table | ||
| print sql | ||
| cur.execute(sql) | ||
| rows = cur.fetchall() | ||
| for row in rows: | ||
| print row |