1 files changed, 114 insertions, 0 deletions
diff --git a/src/mon/MonSub.cc b/src/mon/MonSub.cc
new file mode 100644
index 000000000..a2c60ba91
--- /dev/null
+++ b/src/mon/MonSub.cc
@@ -0,0 +1,114 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "MonSub.h"
+
+bool MonSub::have_new() const {
+  return !sub_new.empty();
+}
+
+bool MonSub::need_renew() const
+{
+  return ceph::coarse_mono_clock::now() > renew_after;
+}
+
+void MonSub::renewed()
+{
+  if (clock::is_zero(renew_sent)) {
+    renew_sent = clock::now();
+  }
+  // update sub_sent with sub_new
+  sub_new.insert(sub_sent.begin(), sub_sent.end());
+  std::swap(sub_new, sub_sent);
+  sub_new.clear();
+}
+
+void MonSub::acked(uint32_t interval)
+{
+  if (!clock::is_zero(renew_sent)) {
+    // NOTE: this is only needed for legacy (infernalis or older)
+    // mons; see MonClient::tick().
+    renew_after = renew_sent;
+    renew_after += ceph::make_timespan(interval / 2.0);
+    renew_sent = clock::zero();
+  }
+}
+
+bool MonSub::reload()
+{
+  for (auto& [what, sub] : sub_sent) {
+    if (sub_new.count(what) == 0) {
+      sub_new[what] = sub;
+    }
+  }
+  return have_new();
+}
+
+void MonSub::got(const std::string& what, version_t have)
+{
+  if (auto i = sub_new.find(what); i != sub_new.end()) {
+    auto& sub = i->second;
+    if (sub.start <= have) {
+      if (sub.flags & CEPH_SUBSCRIBE_ONETIME) {
+        sub_new.erase(i);
+      } else {
+        sub.start = have + 1;
+      }
+    }
+  } else if (auto i = sub_sent.find(what); i != sub_sent.end()) {
+    auto& sub = i->second;
+    if (sub.start <= have) {
+      if (sub.flags & CEPH_SUBSCRIBE_ONETIME) {
+        sub_sent.erase(i);
+      } else {
+        sub.start = have + 1;
+      }
+    }
+  }
+}
+
+bool MonSub::want(const std::string& what, version_t start, unsigned flags)
+{
+  if (auto sub = sub_new.find(what);
+      sub != sub_new.end() &&
+      sub->second.start == start &&
+      sub->second.flags == flags) {
+    return false;
+  } else if (auto sub = sub_sent.find(what);
+      sub != sub_sent.end() &&
+      sub->second.start == start &&
+      sub->second.flags == flags) {
+	return false;
+  } else {
+    sub_new[what].start = start;
+    sub_new[what].flags = flags;
+    return true;
+  }
+}
+
+bool MonSub::inc_want(const std::string& what, version_t start, unsigned flags)
+{
+  if (auto sub = sub_new.find(what); sub != sub_new.end()) {
+    if (sub->second.start >= start) {
+      return false;
+    } else {
+      sub->second.start = start;
+      sub->second.flags = flags;
+      return true;
+    }
+  } else if (auto sub = sub_sent.find(what);
+             sub == sub_sent.end() || sub->second.start < start) {
+    auto& item = sub_new[what];
+    item.start = start;
+    item.flags = flags;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+void MonSub::unwant(const std::string& what)
+{
+  sub_sent.erase(what);
+  sub_new.erase(what);
+}