--- /dev/null
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "rgw_realm_reloader.h"
+#include "rgw_rados.h"
+
+#include "rgw_bucket.h"
+#include "rgw_log.h"
+#include "rgw_rest.h"
+#include "rgw_user.h"
+
+#include "common/errno.h"
+
+#define dout_subsys ceph_subsys_rgw
+
+#undef dout_prefix
+#define dout_prefix (*_dout << "rgw realm reloader: ")
+
+
+// safe callbacks from SafeTimer are unneccessary. reload() can take a long
+// time, so we don't want to hold the mutex and block handle_notify() for the
+// duration
+static constexpr bool USE_SAFE_TIMER_CALLBACKS = false;
+
+
+RGWRealmReloader::RGWRealmReloader(RGWRados*& store, std::map<std::string, std::string>& service_map_meta,
+ Pauser* frontends)
+ : store(store),
+ service_map_meta(service_map_meta),
+ frontends(frontends),
+ timer(store->ctx(), mutex, USE_SAFE_TIMER_CALLBACKS),
+ mutex("RGWRealmReloader"),
+ reload_scheduled(nullptr)
+{
+ timer.init();
+}
+
+RGWRealmReloader::~RGWRealmReloader()
+{
+ Mutex::Locker lock(mutex);
+ timer.shutdown();
+}
+
+class RGWRealmReloader::C_Reload : public Context {
+ RGWRealmReloader* reloader;
+ public:
+ C_Reload(RGWRealmReloader* reloader) : reloader(reloader) {}
+ void finish(int r) override { reloader->reload(); }
+};
+
+void RGWRealmReloader::handle_notify(RGWRealmNotify type,
+ bufferlist::iterator& p)
+{
+ if (!store) {
+ /* we're in the middle of reload */
+ return;
+ }
+
+ CephContext *const cct = store->ctx();
+
+ Mutex::Locker lock(mutex);
+ if (reload_scheduled) {
+ ldout(cct, 4) << "Notification on realm, reconfiguration "
+ "already scheduled" << dendl;
+ return;
+ }
+
+ reload_scheduled = new C_Reload(this);
+ cond.SignalOne(); // wake reload() if it blocked on a bad configuration
+
+ // schedule reload() without delay
+ timer.add_event_after(0, reload_scheduled);
+
+ ldout(cct, 4) << "Notification on realm, reconfiguration scheduled" << dendl;
+}
+
+void RGWRealmReloader::reload()
+{
+ CephContext *const cct = store->ctx();
+ ldout(cct, 1) << "Pausing frontends for realm update..." << dendl;
+
+ frontends->pause();
+
+ ldout(cct, 1) << "Frontends paused" << dendl;
+
+ // TODO: make RGWRados responsible for rgw_log_usage lifetime
+ rgw_log_usage_finalize();
+
+ // destroy the existing store
+ RGWStoreManager::close_storage(store);
+ store = nullptr;
+
+ ldout(cct, 1) << "Store closed" << dendl;
+ {
+ // allow a new notify to reschedule us. it's important that we do this
+ // before we start loading the new realm, or we could miss some updates
+ Mutex::Locker lock(mutex);
+ reload_scheduled = nullptr;
+ }
+
+ while (!store) {
+ // recreate and initialize a new store
+ store = RGWStoreManager::get_storage(cct,
+ cct->_conf->rgw_enable_gc_threads,
+ cct->_conf->rgw_enable_lc_threads,
+ cct->_conf->rgw_enable_quota_threads,
+ cct->_conf->rgw_run_sync_thread,
+ cct->_conf->rgw_dynamic_resharding);
+
+ ldout(cct, 1) << "Creating new store" << dendl;
+
+ RGWRados* store_cleanup = nullptr;
+ {
+ Mutex::Locker lock(mutex);
+
+ // failure to recreate RGWRados is not a recoverable error, but we
+ // don't want to assert or abort the entire cluster. instead, just
+ // sleep until we get another notification, and retry until we get
+ // a working configuration
+ if (store == nullptr) {
+ lderr(cct) << "Failed to reinitialize RGWRados after a realm "
+ "configuration update. Waiting for a new update." << dendl;
+
+ // sleep until another event is scheduled
+ while (!reload_scheduled)
+ cond.Wait(mutex);
+
+ ldout(cct, 1) << "Woke up with a new configuration, retrying "
+ "RGWRados initialization." << dendl;
+ }
+
+ if (reload_scheduled) {
+ // cancel the event; we'll handle it now
+ timer.cancel_event(reload_scheduled);
+ reload_scheduled = nullptr;
+
+ // if we successfully created a store, clean it up outside of the lock,
+ // then continue to loop and recreate another
+ std::swap(store, store_cleanup);
+ }
+ }
+
+ if (store_cleanup) {
+ ldout(cct, 4) << "Got another notification, restarting RGWRados "
+ "initialization." << dendl;
+
+ RGWStoreManager::close_storage(store_cleanup);
+ }
+ }
+
+ int r = store->register_to_service_map("rgw", service_map_meta);
+ if (r < 0) {
+ lderr(cct) << "ERROR: failed to register to service map: " << cpp_strerror(-r) << dendl;
+
+ /* ignore error */
+ }
+
+ ldout(cct, 1) << "Finishing initialization of new store" << dendl;
+ // finish initializing the new store
+ ldout(cct, 1) << " - REST subsystem init" << dendl;
+ rgw_rest_init(cct, store, store->get_zonegroup());
+ ldout(cct, 1) << " - user subsystem init" << dendl;
+ rgw_user_init(store);
+ ldout(cct, 1) << " - user subsystem init" << dendl;
+ rgw_bucket_init(store->meta_mgr);
+ ldout(cct, 1) << " - usage subsystem init" << dendl;
+ rgw_log_usage_init(cct, store);
+
+ ldout(cct, 1) << "Resuming frontends with new realm configuration." << dendl;
+
+ frontends->resume(store);
+}
Code Review / stor4nfv.git / blobdiff