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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation. See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MMONSUBSCRIBE_H
+#define CEPH_MMONSUBSCRIBE_H
+
+#include "msg/Message.h"
+#include "include/ceph_features.h"
+
+/*
+ * compatibility with old crap
+ */
+struct ceph_mon_subscribe_item_old {
+ ceph_le64 unused;
+ ceph_le64 have;
+ __u8 onetime;
+} __attribute__ ((packed));
+WRITE_RAW_ENCODER(ceph_mon_subscribe_item_old)
+
+
+class MMonSubscribe final : public Message {
+public:
+ static constexpr int HEAD_VERSION = 3;
+ static constexpr int COMPAT_VERSION = 1;
+
+ std::string hostname;
+ std::map<std::string, ceph_mon_subscribe_item> what;
+
+ MMonSubscribe() : Message{CEPH_MSG_MON_SUBSCRIBE, HEAD_VERSION, COMPAT_VERSION} { }
+private:
+ ~MMonSubscribe() final {}
+
+public:
+ void sub_want(const char *w, version_t start, unsigned flags) {
+ what[w].start = start;
+ what[w].flags = flags;
+ }
+
+ std::string_view get_type_name() const override { return "mon_subscribe"; }
+ void print(std::ostream& o) const override {
+ o << "mon_subscribe(" << what << ")";
+ }
+
+ void decode_payload() override {
+ using ceph::decode;
+ auto p = payload.cbegin();
+ if (header.version < 2) {
+ std::map<std::string, ceph_mon_subscribe_item_old> oldwhat;
+ decode(oldwhat, p);
+ what.clear();
+ for (auto q = oldwhat.begin(); q != oldwhat.end(); q++) {
+ if (q->second.have)
+ what[q->first].start = q->second.have + 1;
+ else
+ what[q->first].start = 0;
+ what[q->first].flags = 0;
+ if (q->second.onetime)
+ what[q->first].flags |= CEPH_SUBSCRIBE_ONETIME;
+ }
+ return;
+ }
+ decode(what, p);
+ if (header.version >= 3) {
+ decode(hostname, p);
+ }
+ }
+ void encode_payload(uint64_t features) override {
+ using ceph::encode;
+ if ((features & CEPH_FEATURE_SUBSCRIBE2) == 0) {
+ header.version = 0;
+ std::map<std::string, ceph_mon_subscribe_item_old> oldwhat;
+ for (auto q = what.begin(); q != what.end(); q++) {
+ if (q->second.start)
+ // warning: start=1 -> have=0, which was ambiguous
+ oldwhat[q->first].have = q->second.start - 1;
+ else
+ oldwhat[q->first].have = 0;
+ oldwhat[q->first].onetime = q->second.flags & CEPH_SUBSCRIBE_ONETIME;
+ }
+ encode(oldwhat, payload);
+ return;
+ }
+ header.version = HEAD_VERSION;
+ encode(what, payload);
+ encode(hostname, payload);
+ }
+private:
+ template<class T, typename... Args>
+ friend boost::intrusive_ptr<T> ceph::make_message(Args&&... args);
+};
+
+#endif