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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems, Inc.
*
* Authors:
*
* Jay Pipes <joinfu@sun.com>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
*
* Implements the PRINT_TRANSACTION_MESSAGE(filename, offset) UDF.
*/
#include <config.h>
#include <drizzled/plugin/function.h>
#include <drizzled/item/func.h>
#include <drizzled/function/str/strfunc.h>
#include <drizzled/error.h>
#include <drizzled/internal/my_sys.h>
#include <drizzled/charset.h>
#include <drizzled/gettext.h>
#include <drizzled/errmsg_print.h>
#include <fcntl.h>
#include <errno.h>
#include "transaction_log.h"
#include "print_transaction_message.h"
#include <drizzled/message/transaction.pb.h>
#include <drizzled/replication_services.h>
#include <google/protobuf/io/zero_copy_stream.h>
#include <google/protobuf/io/zero_copy_stream_impl.h>
#include <google/protobuf/io/coded_stream.h>
#include <google/protobuf/text_format.h>
using namespace std;
using namespace drizzled;
using namespace google;
/** Defined in transaction_log.cc */
extern TransactionLog *transaction_log;
plugin::Create_function<PrintTransactionMessageFunction> *print_transaction_message_func_factory= NULL;
void PrintTransactionMessageFunction::fix_length_and_dec()
{
max_length= 2 * 1024 * 1024; /* 2MB size limit seems ok... */
args[0]->collation.set(
get_charset_by_csname(args[0]->collation.collation->csname,
MY_CS_BINSORT), DERIVATION_COERCIBLE);
}
String *PrintTransactionMessageFunction::val_str(String *str)
{
assert(fixed == true);
String *filename_arg= args[0]->val_str(str);
off_t offset_arg= static_cast<int64_t>(args[1]->val_int());
if (filename_arg == NULL || args[1]->null_value == true)
{
my_error(ER_INVALID_NULL_ARGUMENT, MYF(0), func_name());
null_value= true;
return NULL;
}
if (transaction_log == NULL)
{
my_error(ER_INVALID_NULL_ARGUMENT, MYF(0), func_name());
null_value= true;
return NULL;
}
null_value= false;
message::Transaction transaction_message;
/**
* @todo Of course, this is not efficient to create a
* new input stream every time we call the UDF. Create
* a pool of TransactionLogReader objects that can be
* re-used.
*/
const string &filename= transaction_log->getLogFilename();
int log_file= open(filename.c_str(), O_RDONLY);
if (log_file == -1)
{
sql_perror(_("Failed to open transaction log file"), filename);
null_value= true;
return NULL;
}
(void) lseek(log_file, offset_arg, SEEK_SET);
protobuf::io::FileInputStream *file_input= new protobuf::io::FileInputStream(log_file);
file_input->SetCloseOnDelete(true);
protobuf::io::CodedInputStream *coded_input= new protobuf::io::CodedInputStream(file_input);
/* Grab our message type and length */
uint32_t message_type;
if (! coded_input->ReadLittleEndian32(&message_type))
{
delete coded_input;
delete file_input;
/** @todo Error message for this... */
null_value= true;
return NULL;
}
/* Validate message type */
if (message_type != ReplicationServices::TRANSACTION)
{
fprintf(stderr, _("GPB message is not a valid type.\n"));
delete coded_input;
delete file_input;
null_value= true;
return NULL;
}
uint32_t message_size;
if (! coded_input->ReadLittleEndian32(&message_size))
{
delete coded_input;
delete file_input;
/** @todo Error message for this... */
null_value= true;
return NULL;
}
if (message_size > INT_MAX)
{
fprintf(stderr, _("GPB message is not a valid size.\n"));
delete coded_input;
delete file_input;
null_value= true;
return NULL;
}
uint8_t *buffer= (uint8_t *) malloc(message_size);
bool result= coded_input->ReadRaw(buffer, message_size);
if (result == false)
{
// 120 was arbitrary
sql_perror(_("Could not read transaction message. Raw buffer read "), std::string((const char *)buffer, std::min(message_size, 120U)));
}
result= transaction_message.ParseFromArray(buffer, static_cast<int32_t>(message_size));
if (result == false)
{
fprintf(stderr, _("Unable to parse transaction. Got error: %s.\n"), transaction_message.InitializationErrorString().c_str());
if (buffer != NULL)
fprintf(stderr, _("BUFFER: %s\n"), buffer);
}
free(buffer);
string transaction_text;
protobuf::TextFormat::PrintToString(transaction_message, &transaction_text);
str->alloc(transaction_text.length());
str->length(transaction_text.length());
strncpy(str->ptr(), transaction_text.c_str(), transaction_text.length());
delete coded_input;
delete file_input;
return str;
}
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