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323 lines
10 KiB
C++
323 lines
10 KiB
C++
/* -------------------------------------------------------------------------- */
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/* Copyright 2002-2009, Distributed Systems Architecture Group, Universidad */
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/* Complutense de Madrid (dsa-research.org) */
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/* */
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/* Licensed under the Apache License, Version 2.0 (the "License"); you may */
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/* not use this file except in compliance with the License. You may obtain */
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/* a copy of the License at */
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/* */
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/* http://www.apache.org/licenses/LICENSE-2.0 */
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/* */
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/* Unless required by applicable law or agreed to in writing, software */
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/* distributed under the License is distributed on an "AS IS" BASIS, */
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/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. */
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/* See the License for the specific language governing permissions and */
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/* limitations under the License. */
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/* -------------------------------------------------------------------------- */
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#ifndef LEASES_H_
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#define LEASES_H_
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#include <sqlite3.h>
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#include "ObjectSQL.h"
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#include "Attribute.h"
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#include <map>
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#include <vector>
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#include <sstream>
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using namespace std;
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extern "C" int leases_select_cb (
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void * _lease,
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int num,
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char ** values,
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char ** names);
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/**
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* The Leases class represents all the IP and MAC addresses (lease) that can
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* be asigned (or are asigned) in a Virtual Network
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*/
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class Leases : public ObjectSQL
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{
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public:
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/**
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* Creates a new Lease set for a given Virtual Network (oid)
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* @param _db pinter to the DB object used to store the leases
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* @param _oid the virtual network unique identifier
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* @param _size the max number of leases
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*/
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Leases(SqliteDB * _db, int _oid, unsigned long _size):
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oid(_oid), size(_size), db(_db){};
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virtual ~Leases()
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{
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map<unsigned int, Lease *>::iterator it;
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for(it=leases.begin();it!=leases.end();it++)
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{
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delete it->second;
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}
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};
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friend ostream& operator<<(ostream& os, Leases& _leases);
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/**
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* Returns an unused lease, which becomes used
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* @param vid identifier of the VM getting this lease
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* @param ip ip of the returned lease
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* @param mac mac of the returned lease
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* @return 0 if success
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*/
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virtual int get(int vid, string& ip,string& mac) = 0;
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/**
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* Ask for a specific lease in the network
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* @param vid identifier of the VM getting this lease
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* @param ip ip of lease requested
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* @param mac mac of the lease
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* @return 0 if success
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*/
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virtual int set(int vid, const string& ip, string& mac) = 0;
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/**
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* Release an used lease, which becomes unused
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* @param ip of the lease in use
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*/
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virtual void release(const string& ip) = 0;
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// -------------------------------------------------------------------------
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// -------------------------------------------------------------------------
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protected:
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/**
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* The Lease class, it represents a pair of IP and MAC assigned to
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* a Virtual Machine
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*/
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class Lease
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{
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public:
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/**
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* Creates a new lease, string form. This constructor throws a runtime
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* exception if the IP or MAC format is wrong.
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* @param _ip, the Lease IP in string format
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* @param _mac, the Lease MAC in string format
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* @param _vid, the ID of the VM owning the lease
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* @param _used, the lease is in use
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*/
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//Lease(const string& _ip, const string& _mac,int _vid, bool _used=true);
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/**
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* Creates a new lease, numeric form.
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* @param _ip, the Lease IP in numeric format
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* @param _mac, the Lease MAC in numeric format
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* @param _vid, the ID of the VM owning the lease
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* @param _used, the lease is in use
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*/
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Lease(unsigned int _ip, unsigned int _mac[], int _vid, bool _used=true)
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:ip(_ip), vid(_vid), used(_used)
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{
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// TODO check size
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mac[PREFIX]=_mac[PREFIX];
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mac[SUFFIX]=_mac[SUFFIX];
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};
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~Lease(){};
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/**
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* Converts this lease's IP and MAC to string
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* @param ip ip of the lease in string
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* @param mac mac of the lease in string
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*/
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void to_string(string& _ip, string& _mac);
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/**
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* Conversion from string IP to unsigned int IP
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* @return 0 if success
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*/
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static int ip_to_number(const string& ip, unsigned int& i_ip);
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/**
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* Conversion from unsigned int IP to string IP
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*/
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static void ip_to_string(const unsigned int i_ip, string& ip);
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/**
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* Conversion from string MAC to unsigned int[] MAC
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* @return 0 if success
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*/
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static int mac_to_number(const string& mac, unsigned int i_mac[]);
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/**
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* Conversion from string IP to unsigned int IP
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*/
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static void mac_to_string(const unsigned int i_mac[], string& mac);
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/**
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* Prints a Lease in a single line
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*/
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friend ostream& operator<<(ostream& os, Lease& _lease);
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/**
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* Constants to access the array storing the MAC address
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*/
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enum MACIndex
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{
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SUFFIX = 0,/**< Lower significant 4 bytes */
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PREFIX = 1 /**< Higher significant 2 bytes */
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};
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unsigned int ip;
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unsigned int mac [2];
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int vid;
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bool used;
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};
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friend ostream& operator<<(ostream& os, Lease& _lease);
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friend class VirtualNetwork;
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// -------------------------------------------------------------------------
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// Leases fields
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// -------------------------------------------------------------------------
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/**
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* Leases indentifier. Connects it to a Virtual Network
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*/
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int oid;
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/**
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* Number of possible leases (free + asigned)
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*/
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unsigned int size;
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/**
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* Hash of leases, indexed by lease.ip
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*/
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map<unsigned int, Lease *> leases;
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// -------------------------------------------------------------------------
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// DataBase implementation variables
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// -------------------------------------------------------------------------
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/**
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* Pointer to the DataBase
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*/
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SqliteDB * db;
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enum ColNames
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{
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OID = 0,
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IP = 1,
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MAC_PREFIX = 2,
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MAC_SUFFIX = 3,
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VID = 4,
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USED = 5,
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LIMIT = 6
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};
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static const char * table;
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static const char * db_names;
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static const char * db_bootstrap;
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// -------------------------------------------------------------------------
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// Leases methods
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// -------------------------------------------------------------------------
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/**
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* Check if the passed ip corresponds with a given lease
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* @param ip of the lease to be checked
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* @return true if the ip was already assigned
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*/
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bool check(const string& ip);
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bool check(unsigned int ip);
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/**
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* Reads the leases from the DB, and updates the lease hash table
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* @param db pointer to the database.
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* @return 0 on success.
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*/
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virtual int select(SqliteDB * db);
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private:
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friend int leases_select_cb (
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void * _leases,
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int num,
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char ** values,
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char ** names);
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/**
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* Function to unmarshall a leases object
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* @param num the number of columns read from the DB
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* @para names the column names
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* @para vaues the column values
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* @return 0 on success
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*/
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int unmarshall(int num, char **names, char ** values);
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/**
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* This method should not be called, leases are added/removed/updated
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* through add/del interface
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* @param db pointer to the database.
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* @return 0 on success.
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*/
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int insert(SqliteDB * db);
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/**
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* Leases are added/removed/updated through add/del interface
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* This method is for pool management.
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* @param db pointer to the database.
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* @return 0 on success.
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*/
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int drop(SqliteDB * db);
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/**
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* This method should not be called, leases are added/removed/updated
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* through add/del interface
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* @param db pointer to the database.
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* @return 0 on success.
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*/
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int update(SqliteDB * db);
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/**
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* Sets the value of a column in the pool for a given object
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* @param db pointer to Database
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* @param column to be selected
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* @param where condition to select the column
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* @param value of the column
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* @return 0 on success
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*/
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int update_column(
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SqliteDB * db,
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const string& column,
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const string& where,
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const string& value)
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{
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return ObjectSQL::update_column(db,table,column,where,value);
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}
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/**
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* Gets the value of a column in the pool for a given object
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* @param db pointer to Database
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* @param column to be selected
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* @param where condition to select the column
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* @param value of the column
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* @return 0 on success
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*/
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int select_column(
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SqliteDB * db,
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const string& column,
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const string& where,
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string * value)
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{
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return ObjectSQL::select_column(db,table,column,where,value);
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}
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};
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#endif /*LEASES_H_*/
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