consumer_restorem.cpp

MySQL数据库开发源码 值得一看哦

/* Copyright (C) 2003 MySQL AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "consumer_restore.hpp"
#include <NdbSleep.h>

extern FilteredNdbOut err;
extern FilteredNdbOut info;
extern FilteredNdbOut debug;

static bool asynchErrorHandler(NdbTransaction * trans, Ndb * ndb);
static void callback(int result, NdbTransaction* trans, void* aObject);

bool
BackupRestore::init()
{

  if (!m_restore && !m_restore_meta)
    return true;

  m_ndb = new Ndb();

  if (m_ndb == NULL)
    return false;
  
  // Turn off table name completion
  m_ndb->useFullyQualifiedNames(false);

  m_ndb->init(1024);
  if (m_ndb->waitUntilReady(30) != 0)
  {
    ndbout << "Failed to connect to ndb!!" << endl;
    return false;
  }
  ndbout << "Connected to ndb!!" << endl;

#if USE_MYSQL
  if(use_mysql) 
  {
    if ( mysql_thread_safe() == 0 ) 
    {
      ndbout << "Not thread safe mysql library..." << endl;
      exit(-1);
    }
    
    ndbout << "Connecting to MySQL..." <<endl;
    
    /**
     * nwe param:
     *  port
     *  host
     *  user
     */
    bool returnValue = true;
    mysql_init(&mysql);
    {
      int portNo = 3306;
      if ( mysql_real_connect(&mysql,
			      ga_host,
			      ga_user,
			      ga_password,
			      ga_database,
			      ga_port,
::			      ga_socket,
			      0) == NULL ) 
      {
	ndbout_c("Connect failed: %s", mysql_error(&mysql));
	returnValue = false;
      }
      mysql.reconnect= 1;
      ndbout << "Connected to MySQL!!!" <<endl;
    }

    /*  if(returnValue){
	mysql_set_server_option(&mysql, MYSQL_OPTION_MULTI_STATEMENTS_ON);
	}
    */
    return returnValue;
  }
#endif

  if (m_callback) {
    delete [] m_callback;
    m_callback = 0;
  }

  m_callback = new restore_callback_t[m_parallelism];

  if (m_callback == 0)
  {
    ndbout << "Failed to allocate callback structs" << endl;
    return false;
  }

  m_free_callback = m_callback;
  for (int i= 0; i < m_parallelism; i++) {
    m_callback[i].restore = this;
    m_callback[i].connection = 0;
    m_callback[i].retries = 0;
    if (i > 0)
      m_callback[i-1].next = &(m_callback[i]);
  }
  m_callback[m_parallelism-1].next = 0;

  return true;
  
}

BackupRestore::~BackupRestore()
{
  if (m_ndb != 0)
    delete m_ndb;

  if (m_callback)
    delete [] m_callback;
}

#ifdef USE_MYSQL
bool
BackupRestore::table(const TableS & table, MYSQL * mysqlp){
  if (!m_restore_meta) 
  {
    return true;
  }
    
  char tmpTabName[MAX_TAB_NAME_SIZE*2];
  sprintf(tmpTabName, "%s", table.getTableName());
  char * database = strtok(tmpTabName, "/");
  char * schema   = strtok( NULL , "/");
  char * tableName    = strtok( NULL , "/");

  /**
   * this means that the user did not specify schema
   * and it is a v2x backup
   */
  if(database == NULL)
    return false;
  if(schema == NULL)
    return false;
  if(tableName==NULL)
    tableName = schema; 
  
  char stmtCreateDB[255];
  sprintf(stmtCreateDB,"CREATE DATABASE %s", database);
  
  /*ignore return value. mysql_select_db will trap errors anyways*/
  if (mysql_query(mysqlp,stmtCreateDB) == 0)
  {
    //ndbout_c("%s", stmtCreateDB);
  }

  if (mysql_select_db(&mysql, database) != 0) 
  {
    ndbout_c("Error: %s", mysql_error(&mysql));
    return false;
  }
  
  char buf [2048];
  /**
   * create table ddl
   */
  if (create_table_string(table, tableName,  buf)) 
  {
    ndbout_c("Unable to create a table definition since the "
	     "backup contains undefined types");
    return false;
  }

  //ndbout_c("%s", buf);
  
  if (mysql_query(mysqlp,buf) != 0) 
  {
      ndbout_c("Error: %s", mysql_error(&mysql));
      return false;
  } else 
  {
    ndbout_c("Successfully restored table %s into database %s", tableName, database);
  }
  
  return true;
}
#endif

bool
BackupRestore::table(const TableS & table){
  if (!m_restore_meta) 
  {
    return true;
  }
  NdbDictionary::Dictionary* dict = m_ndb->getDictionary();
  if (dict->createTable(*table.m_dictTable) == -1) 
  {
    err << "Create table " << table.getTableName() << " failed: "
	<< dict->getNdbError() << endl;
    return false;
  }
  info << "Successfully restored table " << table.getTableName()<< endl ;
  return true;
}

void BackupRestore::tuple(const TupleS & tup)
{
  if (!m_restore) 
  {
    delete &tup;
    return;  
  }

  restore_callback_t * cb = m_free_callback;

  if (cb)
  {
    m_free_callback = cb->next;
    cb->retries = 0;
    cb->tup = &tup;
    tuple_a(cb);
  }

  if (m_free_callback == 0)
  {
    // send-poll all transactions
    // close transaction is done in callback
    m_ndb->sendPollNdb(3000, 1);
  }
}

void BackupRestore::tuple_a(restore_callback_t *cb)
{
  while (cb->retries < 10) 
  {
    /**
     * start transactions
     */
    cb->connection = m_ndb->startTransaction();
    if (cb->connection == NULL) 
    {
      /*
	if (asynchErrorHandler(cb->connection, m_ndb)) 
	{
	cb->retries++;
	continue;
	}
      */
      asynchExitHandler();
    } // if
    
    const TupleS &tup = *(cb->tup);
    const TableS * table = tup.getTable();
    NdbOperation * op = cb->connection->getNdbOperation(table->getTableName());
    
    if (op == NULL) 
    {
      if (asynchErrorHandler(cb->connection, m_ndb)) 
      {
	cb->retries++;
	continue;
      }
      asynchExitHandler();
    } // if
    
    if (op->writeTuple() == -1) 
    {
      if (asynchErrorHandler(cb->connection, m_ndb))
      {
	cb->retries++;
	continue;
      }
      asynchExitHandler();
    } // if
    
    Uint32 ret = 0;
    for (int i = 0; i < tup.getNoOfAttributes(); i++) 
    {
      const AttributeS * attr = tup[i];
      int size = attr->Desc->size;
      int arraySize = attr->Desc->arraySize;
      char * dataPtr = attr->Data.string_value;
      Uint32 length = (size * arraySize) / 8;
      if (attr->Desc->m_column->getPrimaryKey()) 
      {
	ret = op->equal(i, dataPtr, length);
      }
      else
      {
	if (attr->Data.null) 
	  ret = op->setValue(i, NULL, 0);
	else
	  ret = op->setValue(i, dataPtr, length);
      }

      if (ret<0) 
	{
	  ndbout_c("Column: %d type %d",i,
		   tup.getTable()->m_dictTable->getColumn(i)->getType());
	  if (asynchErrorHandler(cb->connection, m_ndb)) 
	    {
	      cb->retries++;
	      break;
	    }
	  asynchExitHandler();
	}
    }
    if (ret < 0)
      continue;

    // Prepare transaction (the transaction is NOT yet sent to NDB)
    cb->connection->executeAsynchPrepare(Commit, &callback, cb);
    m_transactions++;
  }
  ndbout_c("Unable to recover from errors. Exiting...");
  asynchExitHandler();
}

void BackupRestore::cback(int result, restore_callback_t *cb)
{
  if (result<0)
  {
    /**
       * Error. temporary or permanent?
       */
    if (asynchErrorHandler(cb->connection, m_ndb)) 
    {
      cb->retries++;
      tuple_a(cb);
    }
    else
    {
      ndbout_c("Restore: Failed to restore data "
	       "due to a unrecoverable error. Exiting...");
      delete m_ndb;
      delete cb->tup;
      exit(-1);
    }
  }
  else 
  {
    /**
     * OK! close transaction
     */
    m_ndb->closeTransaction(cb->connection);
    delete cb->tup;
    m_transactions--;
  }
}

void BackupRestore::asynchExitHandler() 
{
  if (m_ndb != NULL)
    delete m_ndb;
  exit(-1);
}

#if 0 // old tuple impl
void
BackupRestore::tuple(const TupleS & tup)
{
  if (!m_restore)
    return;
  while (1) 
  {
    NdbTransaction * trans = m_ndb->startTransaction();
    if (trans == NULL) 
    {
      // Deep shit, TODO: handle the error
      ndbout << "Cannot start transaction" << endl;
      exit(-1);
    } // if
    
    const TableS * table = tup.getTable();
    NdbOperation * op = trans->getNdbOperation(table->getTableName());
    if (op == NULL) 
    {
      ndbout << "Cannot get operation: ";
      ndbout << trans->getNdbError() << endl;
      exit(-1);
    } // if
    
    // TODO: check return value and handle error
    if (op->writeTuple() == -1) 
    {
      ndbout << "writeTuple call failed: ";
      ndbout << trans->getNdbError() << endl;
      exit(-1);
    } // if
    
    for (int i = 0; i < tup.getNoOfAttributes(); i++) 
    {
      const AttributeS * attr = tup[i];
      int size = attr->Desc->size;
      int arraySize = attr->Desc->arraySize;
      const char * dataPtr = attr->Data.string_value;
      
      const Uint32 length = (size * arraySize) / 8;
      if (attr->Desc->m_column->getPrimaryKey()) 
	op->equal(i, dataPtr, length);
    }
    
    for (int i = 0; i < tup.getNoOfAttributes(); i++) 
    {
      const AttributeS * attr = tup[i];
      int size = attr->Desc->size;
      int arraySize = attr->Desc->arraySize;
      const char * dataPtr = attr->Data.string_value;
      
      const Uint32 length = (size * arraySize) / 8;
      if (!attr->Desc->m_column->getPrimaryKey())
	if (attr->Data.null)
	  op->setValue(i, NULL, 0);
	else
	  op->setValue(i, dataPtr, length);
    }
    int ret = trans->execute(Commit);
    if (ret != 0)
    {
      ndbout << "execute failed: ";
      ndbout << trans->getNdbError() << endl;
      exit(-1);
    }
    m_ndb->closeTransaction(trans);
    if (ret == 0)
      break;
  }
  m_dataCount++;
}
#endif

void
BackupRestore::endOfTuples()
{
  if (!m_restore)
    return;

  // Send all transactions to NDB 
  m_ndb->sendPreparedTransactions(0);

  // Poll all transactions
  m_ndb->pollNdb(3000, m_transactions);

  // Close all transactions
  //  for (int i = 0; i < nPreparedTransactions; i++) 
  // m_ndb->closeTransaction(asynchTrans[i]);
}

void
BackupRestore::logEntry(const LogEntry & tup)
{
  if (!m_restore)
    return;

  NdbTransaction * trans = m_ndb->startTransaction();
  if (trans == NULL) 
  {
    // Deep shit, TODO: handle the error
    ndbout << "Cannot start transaction" << endl;
    exit(-1);
  } // if
  
  const TableS * table = tup.m_table;
  NdbOperation * op = trans->getNdbOperation(table->getTableName());
  if (op == NULL) 
  {
    ndbout << "Cannot get operation: ";
    ndbout << trans->getNdbError() << endl;
    exit(-1);
  } // if
  
  int check = 0;
  switch(tup.m_type)
  {
  case LogEntry::LE_INSERT:
    check = op->insertTuple();
    break;
  case LogEntry::LE_UPDATE:
    check = op->updateTuple();
    break;
  case LogEntry::LE_DELETE:
    check = op->deleteTuple();
    break;
  default:
    ndbout << "Log entry has wrong operation type."
	   << " Exiting...";
    exit(-1);
  }
  
  for (int i = 0; i < tup.m_values.size(); i++) 
  {
    const AttributeS * attr = tup.m_values[i];
    int size = attr->Desc->size;
    int arraySize = attr->Desc->arraySize;
    const char * dataPtr = attr->Data.string_value;
    
    const Uint32 length = (size / 8) * arraySize;
    if (attr->Desc->m_column->getPrimaryKey()) 
      op->equal(attr->Desc->attrId, dataPtr, length);
    else
      op->setValue(attr->Desc->attrId, dataPtr, length);
  }
  
#if 1
  trans->execute(Commit);
#else
  const int ret = trans->execute(Commit);
  // Both insert update and delete can fail during log running
  // and it's ok
  
  if (ret != 0)
  {
    ndbout << "execute failed: ";
    ndbout << trans->getNdbError() << endl;
    exit(-1);
  }
#endif
  
  m_ndb->closeTransaction(trans);
  m_logCount++;
}

void
BackupRestore::endOfLogEntrys()
{
  if (m_restore) 
  {
    ndbout << "Restored " << m_dataCount << " tuples and "
	     << m_logCount << " log entries" << endl;
  }
}
#if 0
/*****************************************
 *
 * Callback function for asynchronous transactions
 *
 * Idea for error handling: Transaction objects have to be stored globally when
 *                they are prepared.
 *        In the callback function if the transaction:
 *          succeeded: delete the object from global storage
 *          failed but can be retried: execute the object that is in global storage
 *          failed but fatal: delete the object from global storage
 *
 ******************************************/
static void restoreCallback(int result,            // Result for transaction
			    NdbTransaction *object, // Transaction object
			    void *anything)        // Not used
{
  static Uint32 counter = 0;
  

  debug << "restoreCallback function called " << counter << " time(s)" << endl;

  ++counter;

  if (result == -1) 
  {
      ndbout << " restoreCallback (" << counter;
      if ((counter % 10) == 1) 
      {
	  ndbout << "st";
      } // if
      else if ((counter % 10) == 2) 
      {
	ndbout << "nd";
      } // else if
      else if ((counter % 10 ) ==3) 
      {
	ndbout << "rd";
      } // else if
      else 
      {
	ndbout << "th";
      } // else
      err << " time: error detected " << object->getNdbError() << endl;
    } // if
  
} // restoreCallback
#endif



/*
 *   callback : This is called when the transaction is polled
 *              
 *   (This function must have three arguments: 
 *   - The result of the transaction, 
 *   - The NdbTransaction object, and 
 *   - A pointer to an arbitrary object.)
 */

static void
callback(int result, NdbTransaction* trans, void* aObject)
{
  restore_callback_t *cb = (restore_callback_t *)aObject;
  (cb->restore)->cback(result, cb);
}

/**
 * returns true if is recoverable,
 * Error handling based on hugo
 *  false if it is an  error that generates an abort.
 */
static
bool asynchErrorHandler(NdbTransaction * trans, Ndb* ndb) 
{
  NdbError error = trans->getNdbError();
  ndb->closeTransaction(trans);
  switch(error.status)
  {
  case NdbError::Success:
      return false;
      // ERROR!
      break;
      
  case NdbError::TemporaryError:
    NdbSleep_MilliSleep(10);
    return true;
    // RETRY
    break;
    
  case NdbError::UnknownResult:
    ndbout << error << endl;
    return false;
    // ERROR!
    break;
    
  default:
  case NdbError::PermanentError:
    switch (error.code)
    {
    case 499:
    case 250:
      NdbSleep_MilliSleep(10);
      return true; //temp errors?
    default:
      break;
    }
    //ERROR
    ndbout << error << endl;
    return false;
    break;
  }
  return false;
}