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#include <drizzled/global.h>
#include <drizzled/message/binary_log.h>
#include <google/protobuf/io/coded_stream.h>
using namespace google;
bool
BinaryLog::Event::write(protobuf::io::CodedOutputStream* out) const
{
// We frame each event in a length encoded in a special manner, and
// end it with a CRC-32 checksum.
// Write length and type
unsigned char buf[LENGTH_ENCODE_MAX_BYTES + 1];
unsigned char *end= length_encode(m_message->ByteSize(), buf);
*end++= m_type;
char cs[4] = { 0 }; // !!! No checksum yet
#if GOOGLE_PROTOBUF_VERSION >= 2001000
out->WriteRaw(buf, end - buf); // Length + Type
if (out->HadError()
|| !m_message->SerializeToCodedStream(out)) // Event body
return false;
out->WriteRaw(cs, sizeof(cs)); // Checksum
if (out->HadError())
return false;
#else
if (!out->WriteRaw(buf, end - buf) || // Length + Type
!m_message->SerializeToCodedStream(out) || // Event body
!out->WriteRaw(cs, sizeof(cs))) // Checksum
return false;
#endif
return true;
}
bool
BinaryLog::Event::read(protobuf::io::CodedInputStream *in)
{
unsigned char buf[LENGTH_ENCODE_MAX_BYTES + 1];
// Read length peek byte to figure out length
if (!in->ReadRaw(buf, 1))
return false;
// Read in the rest of the length bytes plus the type
size_t bytes= length_decode_bytes(*buf);
if (!in->ReadRaw(buf + 1, bytes))
return false;
size_t length;
(void) length_decode(buf, &length);
// Fetch type from read buffer
m_type= static_cast<EventType>(buf[bytes]);
// Create the right event based on the type code (is there something
// better in the protobuf library?)
protobuf::Message *message= NULL;
switch (m_type) {
case QUERY:
message= new BinaryLog::Query;
break;
case COMMIT:
message= new BinaryLog::Commit;
break;
case ROLLBACK:
message= new BinaryLog::Rollback;
break;
case START:
message= new BinaryLog::Start;
break;
case CHAIN:
message= new BinaryLog::Chain;
break;
case COUNT:
case UNDEF:
break;
}
if (!message)
return false;
// Read the event body as length bytes. It is necessary to limit the
// stream since otherwise ParseFromCodedStream reads all bytes of
// the stream.
protobuf::io::CodedInputStream::Limit limit= in->PushLimit(length);
if (!message->ParseFromCodedStream(in))
return false;
in->PopLimit(limit);
delete m_message;
m_message= message;
// Read checksum (none here yet)
char checksum[4];
if (!in->ReadRaw(checksum, sizeof(checksum)))
return false;
return true;
}
template <class EventClass>
void print_common(std::ostream& out, EventClass* event)
{
out << "# Global Id: (" << event->header().server_id() << "," << event->header().trans_id() << ")\n";
}
void
BinaryLog::Event::print(std::ostream& out) const
{
switch (m_type) {
case QUERY:
{
Query *event= static_cast<Query*>(m_message);
print_common(out, event);
for (protobuf::RepeatedPtrField<Query::Variable>::const_iterator ii=
event->variable().begin() ;
ii != event->variable().end() ;
++ii)
{
out << "set @" << ii->name() << " = '" << ii->val() << "'\n";
}
out << event->query() << std::endl;
break;
}
case COMMIT:
{
Commit *event= static_cast<Commit*>(m_message);
print_common(out, event);
// NYI !!!
break;
}
case ROLLBACK:
{
Rollback *event= static_cast<Rollback*>(m_message);
print_common(out, event);
// NYI !!!
break;
}
case START:
{
Start *event= static_cast<Start*>(m_message);
print_common(out, event);
// NYI !!!
break;
}
case CHAIN:
{
Chain *event= static_cast<Chain*>(m_message);
print_common(out, event);
// NYI !!!
break;
}
default:
break; /* Nothing */
}
}
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