MXS-1881: Expand GTID helper class

Added string conversion methods to the gtid_pos_t class that can be used
to store and load a GTID value.

Also added the missing rpl.cc file that previously only had the Rpl class
constructor in it.

server/modules/routing/avrorouter/rpl.cc

@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2020-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#include "rpl.hh"
+
+#include <maxscale/debug.h>
+#include <sstream>
+
+Rpl::Rpl(SERVICE* service, SRowEventHandler handler, gtid_pos_t gtid):
+    m_handler(handler),
+    m_service(service),
+    m_binlog_checksum(0),
+    m_event_types(0),
+    m_gtid(gtid)
+{
+    /** For detection of CREATE/ALTER TABLE statements */
+    static const char* create_table_regex = "(?i)create[a-z0-9[:space:]_]+table";
+    static const char* alter_table_regex = "(?i)alter[[:space:]]+table";
+    int pcreerr;
+    size_t erroff;
+    m_create_table_re = pcre2_compile((PCRE2_SPTR) create_table_regex, PCRE2_ZERO_TERMINATED,
+                                      0, &pcreerr, &erroff, NULL);
+    m_alter_table_re = pcre2_compile((PCRE2_SPTR) alter_table_regex, PCRE2_ZERO_TERMINATED,
+                                     0, &pcreerr, &erroff, NULL);
+    ss_info_dassert(m_create_table_re && m_alter_table_re,
+                    "CREATE TABLE and ALTER TABLE regex compilation should not fail");
+
+}
+
+void gtid_pos_t::extract(const REP_HEADER& hdr, uint8_t* ptr)
+{
+    domain = extract_field(ptr + 8, 32);
+    server_id = hdr.serverid;
+    seq = extract_field(ptr, 64);
+    event_num = 0;
+    timestamp = hdr.timestamp;
+}
+
+bool gtid_pos_t::parse(const char* str)
+{
+    bool rval = false;
+    char buf[strlen(str) + 1];
+    strcpy(buf, str);
+    char *saved, *dom = strtok_r(buf, ":-\n", &saved);
+    char *serv_id = strtok_r(NULL, ":-\n", &saved);
+    char *sequence = strtok_r(NULL, ":-\n", &saved);
+    char *subseq = strtok_r(NULL, ":-\n", &saved);
+
+    if (dom && serv_id && sequence)
+    {
+        domain = strtol(dom, NULL, 10);
+        server_id = strtol(serv_id, NULL, 10);
+        seq = strtol(sequence, NULL, 10);
+        event_num = subseq ? strtol(subseq, NULL, 10) : 0;
+        rval = true;
+    }
+
+    return rval;
+}
+
+gtid_pos_t gtid_pos_t::from_string(std::string str)
+{
+    gtid_pos_t gtid;
+    gtid.parse(str.c_str());
+    return gtid;
+}
+
+std::string gtid_pos_t::to_string() const
+{
+    std::stringstream ss;
+    ss << domain << "-" << server_id << "-" << seq;
+    return ss.str();
+}
+
+bool gtid_pos_t::empty() const
+{
+    return timestamp == 0 && domain == 0 && server_id == 0 && seq == 0 && event_num == 0;
+}