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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include "crimson/osd/watch.h"
#include "messages/MWatchNotify.h"
namespace {
seastar::logger& logger() {
return crimson::get_logger(ceph_subsys_osd);
}
}
namespace crimson::osd {
bool Watch::NotifyCmp::operator()(NotifyRef lhs, NotifyRef rhs) const
{
ceph_assert(lhs);
ceph_assert(rhs);
return lhs->get_id() < rhs->get_id();
}
seastar::future<> Watch::connect(crimson::net::ConnectionRef conn, bool)
{
if (this->conn == conn) {
logger().debug("conn={} already connected", conn);
}
this->conn = std::move(conn);
return seastar::now();
}
seastar::future<> Watch::send_notify_msg(NotifyRef notify)
{
logger().info("{} for notify(id={})", __func__, notify->ninfo.notify_id);
return conn->send(make_message<MWatchNotify>(
winfo.cookie,
notify->user_version,
notify->ninfo.notify_id,
CEPH_WATCH_EVENT_NOTIFY,
notify->ninfo.bl,
notify->client_gid));
}
seastar::future<> Watch::start_notify(NotifyRef notify)
{
logger().info("{} adding notify(id={})", __func__, notify->ninfo.notify_id);
auto [ it, emplaced ] = in_progress_notifies.emplace(std::move(notify));
ceph_assert(emplaced);
ceph_assert(is_alive());
return is_connected() ? send_notify_msg(*it) : seastar::now();
}
seastar::future<> Watch::notify_ack(
const uint64_t notify_id,
const ceph::bufferlist& reply_bl)
{
logger().info("{}", __func__);
return seastar::do_for_each(in_progress_notifies,
[this_shared=shared_from_this(), &reply_bl] (auto notify) {
return notify->complete_watcher(this_shared, reply_bl);
}
).then([this] {
in_progress_notifies.clear();
return seastar::now();
});
}
seastar::future<> Watch::send_disconnect_msg()
{
if (!is_connected()) {
return seastar::now();
}
ceph::bufferlist empty;
return conn->send(make_message<MWatchNotify>(
winfo.cookie,
0,
0,
CEPH_WATCH_EVENT_DISCONNECT,
empty));
}
void Watch::discard_state()
{
ceph_assert(obc);
in_progress_notifies.clear();
}
seastar::future<> Watch::remove(const bool send_disconnect)
{
logger().info("{}", __func__);
auto disconnected = send_disconnect ? send_disconnect_msg()
: seastar::now();
return std::move(disconnected).then([this] {
return seastar::do_for_each(in_progress_notifies,
[this_shared=shared_from_this()] (auto notify) {
return notify->remove_watcher(this_shared);
}).then([this] {
discard_state();
return seastar::now();
});
});
}
bool notify_reply_t::operator<(const notify_reply_t& rhs) const
{
// comparing std::pairs to emphasize our legacy. ceph-osd stores
// notify_replies as std::multimap<std::pair<gid, cookie>, bl>.
// unfortunately, what seems to be an implementation detail, got
// exposed as part of our public API (the `reply_buffer` parameter
// of the `rados_notify` family).
const auto lhsp = std::make_pair(watcher_gid, watcher_cookie);
const auto rhsp = std::make_pair(rhs.watcher_gid, rhs.watcher_cookie);
return lhsp < rhsp;
}
seastar::future<> Notify::remove_watcher(WatchRef watch)
{
if (discarded || complete) {
return seastar::now();
}
[[maybe_unused]] const auto num_removed = watchers.erase(watch);
assert(num_removed > 0);
return maybe_send_completion();
}
seastar::future<> Notify::complete_watcher(
WatchRef watch,
const ceph::bufferlist& reply_bl)
{
if (discarded || complete) {
return seastar::now();
}
notify_replies.emplace(notify_reply_t{
watch->get_watcher_gid(),
watch->get_cookie(),
reply_bl});
return remove_watcher(std::move(watch));
}
seastar::future<> Notify::maybe_send_completion()
{
logger().info("{} -- {} in progress watchers", __func__, watchers.size());
if (watchers.empty()) {
// prepare reply
ceph::bufferlist bl;
encode(notify_replies, bl);
// FIXME: this is just a stub
std::list<std::pair<uint64_t,uint64_t>> missed;
encode(missed, bl);
complete = true;
ceph::bufferlist empty;
auto reply = make_message<MWatchNotify>(
ninfo.cookie,
user_version,
ninfo.notify_id,
CEPH_WATCH_EVENT_NOTIFY_COMPLETE,
empty,
client_gid);
reply->set_data(bl);
return conn->send(std::move(reply));
}
return seastar::now();
}
} // namespace crimson::osd
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