~drizzle-trunk/drizzle/development

#include <drizzled/global.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <iostream>

#include <fstream>

#include <string>

#include <unistd.h>

#include <drizzled/message/transaction.pb.h>

using namespace std;

using namespace drizzled::message;

/**

 * @file Example application for reading change records and transactions

 */

static void printInsert(const drizzled::message::Command &container, const drizzled::message::InsertRecord &record)

{

  cout << "INSERT INTO `" << container.schema() << "`.`" << container.table() << "` (";

  int32_t num_fields= record.insert_field_size();

  int32_t x;

  for (x= 0; x < num_fields; x++)

  {

    if (x != 0)

      cout << ", ";

    const Table::Field f= record.insert_field(x);

    cout << "`" << f.name() << "`";

  }

  cout << ") VALUES ";

  /* 

   * There may be an INSERT VALUES (),() type statement.  We know the

   * number of records is equal to the field_values array size divided

   * by the number of fields.

   *

   * So, we do an inner and an outer loop.  Outer loop is on the number

   * of records and the inner loop on the number of fields.  In this way, 

   * we know that record.field_values(outer_loop * num_fields) + inner_loop))

   * always gives us our correct field value.

   */

  int32_t num_records= (record.insert_value_size() / num_fields);

  int32_t y;

  for (x= 0; x < num_records; x++)

  {

    if (x != 0)

      cout << ", ";

    cout << "(";

    for (y= 0; y < num_fields; y++)

    {

      if (y != 0)

        cout << ", ";

      cout << "\"" << record.insert_value((x * num_fields) + y) << "\"";

    }

    cout << ")";

  }

  cout << ";";

}

static void printDeleteWithPK(const drizzled::message::Command &container, const drizzled::message::DeleteRecord &record)

{

  cout << "DELETE FROM `" << container.schema() << "`.`" << container.table() << "`";

  int32_t num_where_fields= record.where_field_size();

  /* 

   * Make sure we catch anywhere we're not aligning the fields with

   * the field_values arrays...

   */

  assert(num_where_fields == record.where_value_size());

  cout << " WHERE ";

  int32_t x;

  for (x= 0; x < num_where_fields; x++)

  {

    if (x != 0)

      cout << " AND "; /* Always AND condition with a multi-column PK */

    const Table::Field f= record.where_field(x);

    /* Always equality conditions */

    cout << "`" << f.name() << "` = \"" << record.where_value(x) << "\"";

  }

}

static void printUpdateWithPK(const drizzled::message::Command &container, const drizzled::message::UpdateRecord &record)

{

  int32_t num_update_fields= record.update_field_size();

  int32_t x;

  cout << "UPDATE `" << container.schema() << "`.`" << container.table() << "` SET ";

  for (x= 0;x < num_update_fields; x++)

  {

    Table::Field f= record.update_field(x);

    if (x != 0)

      cout << ", ";

    cout << "`" << f.name() << "` = \"" << record.after_value(x) << "\"";

  }

  int32_t num_where_fields= record.where_field_size();

  /* 

   * Make sure we catch anywhere we're not aligning the fields with

   * the field_values arrays...

   */

  assert(num_where_fields == record.where_value_size());

  cout << " WHERE ";

  for (x= 0;x < num_where_fields; x++)

  {

    if (x != 0)

      cout << " AND "; /* Always AND condition with a multi-column PK */

    const Table::Field f= record.where_field(x);

    /* Always equality conditions */

    cout << "`" << f.name() << "` = \"" << record.where_value(x) << "\"";

  }

}

static void printTransaction(const drizzled::message::Transaction &transaction)

{

  int32_t e_size;

  cout << "/* Start Time: " << transaction.start_timestamp() << " */ START TRANSACTION;"<< endl;

  for (e_size= 0; e_size < transaction.command_size(); e_size++)

  {

    const drizzled::message::Command command= transaction.command(e_size);

    drizzled::message::TransactionContext trx= command.transaction_context();

    cout << "/* SID: " << trx.server_id() << " XID: " << trx.transaction_id() << " */ ";

    switch (command.type())

    {

      case Command::START_TRANSACTION:

        cout << "START TRANSACTION;";

        break;

      case Command::COMMIT:

        cout << "COMMIT;";

        break;

      case Command::ROLLBACK:

        cout << "ROLLBACK;";

        break;

      case Command::INSERT:

      {

        printInsert(command, command.insert_record());

        break;

      }

      case Command::DELETE:

      {

        printDeleteWithPK(command, command.delete_record());

        break;

      }

      case Command::UPDATE:

      {

        printUpdateWithPK(command, command.update_record());

        break;

      }

      default:

      assert(0);

    }

    cout << endl;

  }

  cout << "/* Commit Time: " << transaction.end_timestamp() << " */ COMMIT;" << endl;

}

int main(int argc, char* argv[])

{

  GOOGLE_PROTOBUF_VERIFY_VERSION;

  int file;

  if (argc != 2)

  {

    cerr << "Usage:  " << argv[0] << " TRANSACTION_LOG" << endl;

    return -1;

  }

  Transaction transaction;

  if ((file= open(argv[1], O_RDONLY)) == -1)

  {

    cerr << "Can not open file: " << argv[1] << endl;

  }

  char *buffer= NULL;

  char *temp_buffer;

  while (1)

  {

    uint64_t length;

    /* Read the size */

    if (read(file, &length, sizeof(uint64_t)) != sizeof(uint64_t))

      break;

    if (length > SIZE_MAX)

    {

      cerr << "Attempted to read record bigger than SIZE_MAX" << endl;

      exit(1);

    }

    temp_buffer= (char *)realloc(buffer, (size_t)length);

    if (temp_buffer == NULL)

    {

      cerr << "Memory allocation failure trying to allocate " << length << " bytes."  << endl;

      exit(1);

    }

    memset(temp_buffer, 0, (size_t)length);

    buffer= temp_buffer;

    size_t read_bytes= 0;

    /* Read the transaction */

    if ((read_bytes= read(file, buffer, (size_t)length)) != (size_t)length)

    {

      cerr << "Could not read entire transaction. Read " << read_bytes << " bytes instead of " << length << " bytes." << endl;

      exit(1);

    }

    transaction.ParseFromArray(buffer, (int) length);

    /* Print the transaction */

    printTransaction(transaction);

  }

  return 0;

}