First commit of SkySql Gateway with Mysql protocol implemented by Massimiliano

protocol_1.0/skysql_backend.c

@@ -0,0 +1,64 @@
+////////////////////////////////////////
+// SKYSQL Backend
+// By Massimiliano Pinto 2012
+// SkySQL AB
+////////////////////////////////////////
+
+#include "skysql_gw.h"
+
+#define SKYSQL_READ 0
+#define SKYSQL_WRITE 1
+
+int skysql_query_is_select(const char *query) {
+
+	return SKYSQL_READ;
+}
+
+int skysql_ext_file_ver(void) {
+	int ret = 13;
+	return ret;
+}
+
+int select_random_slave_server(int nslaves) {
+	int random_balancer = (int) ((nslaves) * (rand() / (RAND_MAX + 1.0)));
+	return random_balancer;
+}
+
+int get_server_from_list(char **selected_host, int *selected_port, char *server_list, int num, apr_pool_t *p) {
+	int ret = -1;
+	int curr_srv = 0;
+	char *next = NULL;
+	char *tmp = NULL;
+	int port;
+
+	if (num == 0) {
+		port = atoi(strchr(server_list, ':') + 1), sizeof(port);
+		memcpy(selected_port, &port, sizeof(int));
+		*selected_host = apr_pstrndup(p, server_list, strchr(server_list, ':') - server_list);	
+
+		return 1;
+	}
+
+	next = server_list;
+
+	while (curr_srv < num) {
+		tmp = strchr(next, ',');
+		if (tmp != NULL) {
+			curr_srv++;
+			next = tmp+1;
+		} else {
+			return -1;
+		}
+	
+		if (curr_srv == num) {
+			port = atoi(strchr(next, ':') + 1);
+			memcpy(selected_port,  &port, sizeof(port));
+			*selected_host = apr_pstrndup(p, next, strchr(next, ':') - next);
+			ret = 0;
+
+			break;
+		}
+	}
+
+	return ret;
+}