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#include "connection.h"
#include "error.h"
#include "selectcommand.h"
#include "modifycommand.h"
#include "reflection.h"
#include <ucontext.h>
class Opts {
public:
Opts() { port = 3306; }
std::string server;
std::string user;
std::string password;
std::string database;
unsigned int port;
std::string unix_socket;
static Reflector<Opts>::Vars vars;
};
Reflector<Opts>::Vars Opts::vars = {
Map(Opts, server),
Map(Opts, user),
Map(Opts, password),
Map(Opts, database),
Map(Opts, unix_socket),
Map(Opts, port),
};
MySQL::Connection::Connection(const std::string & str) :
txDepth(0),
rolledback(false)
{
Opts o(Reflector<Opts>::NameValueNew(str));
mysql_init(&conn);
if (mysql_real_connect(&conn, o.server.c_str(), o.user.c_str(), o.password.c_str(), o.database.c_str(),
o.port, o.unix_socket.c_str(), CLIENT_LOCAL_FILES | CLIENT_MULTI_STATEMENTS) == NULL) {
throw ConnectionError();
}
if (mysql_set_character_set(&conn, "utf8")) {
throw ConnectionError();
}
}
MySQL::Connection::~Connection()
{
mysql_close(&conn);
}
void
MySQL::Connection::finish() const
{
if (txDepth != 0) {
rollbackTx();
throw Error("Transaction still open");
}
}
int
MySQL::Connection::beginTx() const
{
if (txDepth == 0) {
if (mysql_autocommit(&conn, 0)) {
throw Error(mysql_error(&conn));
}
rolledback = false;
}
return ++txDepth;
}
int
MySQL::Connection::commitTx() const
{
if (rolledback) {
return rollbackTx();
}
if (--txDepth == 0) {
if (mysql_commit(&conn)) {
throw Error(mysql_error(&conn));
}
}
return txDepth;
}
int
MySQL::Connection::rollbackTx() const
{
if (--txDepth == 0) {
if (mysql_rollback(&conn)) {
throw Error(mysql_error(&conn));
}
}
else {
rolledback = true;
}
return txDepth;
}
bool
MySQL::Connection::inTx() const
{
return txDepth;
}
DB::BulkDeleteStyle
MySQL::Connection::bulkDeleteStyle() const
{
return DB::BulkDeleteUsingUsingAlias;
}
DB::BulkUpdateStyle
MySQL::Connection::bulkUpdateStyle() const
{
return DB::BulkUpdateUsingJoin;
}
void
MySQL::Connection::ping() const
{
if (mysql_ping(&conn)) {
throw Error(mysql_error(&conn));
}
}
DB::SelectCommand *
MySQL::Connection::newSelectCommand(const std::string & sql) const
{
return new SelectCommand(this, sql);
}
DB::ModifyCommand *
MySQL::Connection::newModifyCommand(const std::string & sql) const
{
return new ModifyCommand(this, sql);
}
namespace MySQL {
class LoadContext {
public:
LoadContext(MYSQL * c, const char * table, const char * extra) :
loadBuf(NULL),
loadBufLen(0),
bufOff(0),
conn(c)
{
static char buf[BUFSIZ];
int len = snprintf(buf, BUFSIZ, "LOAD DATA LOCAL INFILE 'any' INTO TABLE %s %s", table, extra);
mysql_send_query(conn, buf, len);
}
static int local_infile_init(void ** ptr, const char *, void * ctx) {
*ptr = ctx;
return 0;
}
static int local_infile_read(void * obj, char * buf, unsigned int bufSize) {
LoadContext * ctx = static_cast<LoadContext *>(obj);
if (ctx->loadBufLen - ctx->bufOff == 0) {
swapcontext(&ctx->jmpMySQL, &ctx->jmpP2);
if (ctx->loadBufLen - ctx->bufOff <= 0) {
// Nothing to do or error
return ctx->bufOff;
}
}
unsigned int copy = std::min(ctx->loadBufLen - ctx->bufOff, bufSize);
memcpy(buf, ctx->loadBuf + ctx->bufOff, copy);
ctx->bufOff += copy;
return copy;
}
static void local_infile_end(void *) {
}
static int local_infile_error(void *, char*, unsigned int) {
return 0;
}
static void loadLocalData(LoadContext * ctx)
{
ctx->loadReturn = mysql_read_query_result(ctx->conn);
}
char stack[16384];
ucontext_t jmpP2;
ucontext_t jmpMySQL;
const char * loadBuf;
unsigned int loadBufLen;
int bufOff;
MYSQL * conn;
int loadReturn;
};
}
void
MySQL::Connection::beginBulkUpload(const char * table, const char * extra) const
{
ctx = boost::shared_ptr<LoadContext>(new MySQL::LoadContext(&conn, table, extra));
getcontext(&ctx->jmpMySQL);
ctx->jmpMySQL.uc_stack.ss_sp = ctx->stack;
ctx->jmpMySQL.uc_stack.ss_size = sizeof(ctx->stack);
ctx->jmpMySQL.uc_link = &ctx->jmpP2;
makecontext(&ctx->jmpMySQL, (void (*)())&LoadContext::loadLocalData, 1, ctx.get());
mysql_set_local_infile_handler(&conn, LoadContext::local_infile_init, LoadContext::local_infile_read,
LoadContext::local_infile_end, LoadContext::local_infile_error, ctx.get());
// begin the load, context swaps back when buffer is empty
swapcontext(&ctx->jmpP2, &ctx->jmpMySQL);
}
void
MySQL::Connection::endBulkUpload(const char * msg) const
{
ctx->loadBuf = NULL;
ctx->loadBufLen = 0;
ctx->bufOff = msg ? -1 : 0;
// switch context with empty buffer fires finished
swapcontext(&ctx->jmpP2, &ctx->jmpMySQL);
// Check result
if (!msg) {
if (ctx->loadReturn) {
ctx.reset();
throw Error(mysql_error(&conn));
}
}
ctx.reset();
}
size_t
MySQL::Connection::bulkUploadData(const char * data, size_t len) const
{
ctx->loadBuf = data;
ctx->loadBufLen = len;
ctx->bufOff = 0;
// switch context to load the buffered data
swapcontext(&ctx->jmpP2, &ctx->jmpMySQL);
return len;
}
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