Make query_classifier part of core.

The query classifier interface is now built as an integral
part of MaxScale core.

server/core/query_classifier.c

@@ -0,0 +1,183 @@
+/**
+ * @section LICENCE
+ *
+ * This file is distributed as part of the MariaDB Corporation MaxScale. It 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, version 2.
+ *
+ * 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 Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA.
+ *
+ * Copyright MariaDB Corporation Ab
+ *
+ * @file
+ *
+ */
+
+#include <query_classifier.h>
+#include <log_manager.h>
+#include <modules.h>
+
+//#define QC_TRACE_ENABLED
+#undef QC_TRACE_ENABLED
+
+#if defined(QC_TRACE_ENABLED)
+#define QC_TRACE() MXS_NOTICE(__func__)
+#else
+#define QC_TRACE()
+#endif
+
+static const char default_qc_name[] = "qc_mysqlembedded";
+
+static QUERY_CLASSIFIER* classifier;
+
+
+bool qc_init(const char* plugin_name)
+{
+    QC_TRACE();
+    ss_dassert(!classifier);
+
+    if (!plugin_name || (*plugin_name == 0))
+    {
+        MXS_NOTICE("No query classifier specified, using default '%s'.", default_qc_name);
+        plugin_name = default_qc_name;
+    }
+
+    bool success = false;
+    void* module = load_module(plugin_name, MODULE_QUERY_CLASSIFIER);
+
+    if (module)
+    {
+        classifier = (QUERY_CLASSIFIER*) module;
+        MXS_NOTICE("%s loaded.", plugin_name);
+
+        success = classifier->qc_init();
+    }
+    else
+    {
+        MXS_ERROR("Could not load %s.", plugin_name);
+    }
+
+    return success;
+}
+
+void qc_end(void)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    classifier->qc_end();
+    classifier = NULL;
+}
+
+bool qc_thread_init(void)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_thread_init();
+}
+
+void qc_thread_end(void)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_thread_end();
+}
+
+qc_query_type_t qc_get_type(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_type(query);
+}
+
+qc_query_op_t qc_get_operation(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_operation(query);
+}
+
+char* qc_get_created_table_name(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_created_table_name(query);
+}
+
+bool qc_is_drop_table_query(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_is_drop_table_query(query);
+}
+
+bool qc_is_real_query(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_is_real_query(query);
+}
+
+char** qc_get_table_names(GWBUF* query, int* tblsize, bool fullnames)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_table_names(query, tblsize, fullnames);
+}
+
+char* qc_get_canonical(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_canonical(query);
+}
+
+bool qc_query_has_clause(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_query_has_clause(query);
+}
+
+char* qc_get_qtype_str(qc_query_type_t qtype)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_qtype_str(qtype);
+}
+
+char* qc_get_affected_fields(GWBUF* query)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_affected_fields(query);
+}
+
+char** qc_get_database_names(GWBUF* query, int* sizep)
+{
+    QC_TRACE();
+    ss_dassert(classifier);
+
+    return classifier->qc_get_database_names(query, sizep);
+}