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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "local_rpc_monitor_map.h"
#include "sbenv.h"
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/log/log.h>
LOG_SETUP(".slobrok.server.local_rpc_monitor_map");
namespace slobrok {
#pragma GCC diagnostic ignored "-Winline"
namespace {
struct ChainedCompletionHandler : CompletionHandler {
std::unique_ptr<CompletionHandler> first;
std::unique_ptr<CompletionHandler> second;
ChainedCompletionHandler(std::unique_ptr<CompletionHandler> f,
std::unique_ptr<CompletionHandler> s)
: first(std::move(f)), second(std::move(s))
{}
void doneHandler(OkState result) override {
first->doneHandler(result);
second->doneHandler(result);
}
~ChainedCompletionHandler() override {}
};
}
void LocalRpcMonitorMap::DelayedTasks::PerformTask() {
std::vector<Event> todo;
std::swap(todo, _queue);
for (const auto & entry : todo) {
switch (entry.type) {
case EventType::ADD:
_target.doAdd(entry.mapping);
break;
case EventType::REMOVE:
_target.doRemove(entry.mapping);
break;
}
}
}
LocalRpcMonitorMap::LocalRpcMonitorMap(FNET_Scheduler *scheduler,
MappingMonitorFactory mappingMonitorFactory)
: _delayedTasks(scheduler, *this),
_map(),
_dispatcher(),
_history(),
_mappingMonitor(mappingMonitorFactory(*this)),
_subscription(MapSubscription::subscribe(_dispatcher, _history))
{
}
LocalRpcMonitorMap::~LocalRpcMonitorMap() = default;
LocalRpcMonitorMap::PerService &
LocalRpcMonitorMap::lookup(const ServiceMapping &mapping) {
LOG(spam, "lookup %s->%s", mapping.name.c_str(), mapping.spec.c_str());
auto iter = _map.find(mapping.name);
if (iter == _map.end()) {
LOG_ABORT("not in map");
}
PerService & psd = iter->second;
if (psd.spec != mapping.spec) {
LOG_ABORT("conflict in map: %s->%s");
}
LOG(spam, "found in map: %s->%s [%s,%s]",
iter->first.c_str(), psd.spec.c_str(),
psd.up ? "up" : "down",
psd.localOnly ? "local" : "global");
return psd;
}
void LocalRpcMonitorMap::addToMap(const ServiceMapping &mapping, PerService psd, bool hurry) {
auto [ iter, was_inserted ] =
_map.try_emplace(mapping.name, std::move(psd));
LOG_ASSERT(was_inserted);
_mappingMonitor->start(mapping, hurry);
}
LocalRpcMonitorMap::RemovedData
LocalRpcMonitorMap::removeFromMap(Map::iterator iter) {
auto name = iter->first;
PerService psd = std::move(iter->second);
ServiceMapping mapping{iter->first, psd.spec};
_mappingMonitor->stop(mapping);
_map.erase(iter);
return RemovedData {
.mapping = mapping,
.up = psd.up,
.localOnly = psd.localOnly,
.inflight = std::move(psd.inflight)
};
}
ServiceMapHistory & LocalRpcMonitorMap::history() {
return _history;
}
bool LocalRpcMonitorMap::wouldConflict(const ServiceMapping &mapping) const {
auto iter = _map.find(mapping.name);
if (iter == _map.end()) {
return false; // no mapping, no conflict
}
return (iter->second.spec != mapping.spec);
}
void LocalRpcMonitorMap::addLocal(const ServiceMapping &mapping,
std::unique_ptr<CompletionHandler> inflight)
{
LOG(debug, "try local add: mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str());
auto old = _map.find(mapping.name);
if (old != _map.end()) {
PerService & exists = old->second;
if (exists.spec == mapping.spec) {
LOG(debug, "added mapping %s->%s was already present",
mapping.name.c_str(), mapping.spec.c_str());
if (exists.up) {
inflight->doneHandler(OkState(0, "already registered"));
} else if (exists.inflight) {
auto newInflight = std::make_unique<ChainedCompletionHandler>(
std::move(exists.inflight),
std::move(inflight));
exists.inflight = std::move(newInflight);
} else {
_mappingMonitor->stop(mapping);
exists.inflight = std::move(inflight);
_mappingMonitor->start(mapping, true);
}
return;
}
LOG(warning, "tried addLocal for mapping %s->%s, but already had conflicting mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str(),
mapping.name.c_str(), exists.spec.c_str());
inflight->doneHandler(OkState(FRTE_RPC_METHOD_FAILED, "conflict"));
return;
}
addToMap(mapping, localService(mapping, std::move(inflight)), true);
}
void LocalRpcMonitorMap::removeLocal(const ServiceMapping &mapping) {
LOG(debug, "try local remove: mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str());
auto old = _map.find(mapping.name);
if (old == _map.end()) {
return; // already removed, OK
}
PerService & exists = old->second;
if (exists.spec != mapping.spec) {
LOG(warning, "tried removeLocal for mapping %s->%s, but already had conflicting mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str(),
mapping.name.c_str(), exists.spec.c_str());
return; // unregister for old, conflicting mapping
}
if (exists.localOnly) {
// we can just remove it
auto removed = removeFromMap(old);
if (removed.inflight) {
auto target = std::move(removed.inflight);
target->doneHandler(OkState(13, "removed during initialization"));
}
if (removed.up) {
_dispatcher.remove(removed.mapping);
}
return;
}
// also exists in consensus map, so we can't just remove it
// instead, pretend it's down and delay next ping
_mappingMonitor->stop(mapping);
if (exists.up) {
exists.up = false;
_dispatcher.remove(mapping);
}
_mappingMonitor->start(mapping, false);
return;
}
void LocalRpcMonitorMap::add(const ServiceMapping &mapping) {
_delayedTasks.handleLater(Event::add(mapping));
}
void LocalRpcMonitorMap::remove(const ServiceMapping &mapping) {
_delayedTasks.handleLater(Event::remove(mapping));
}
void LocalRpcMonitorMap::doAdd(const ServiceMapping &mapping) {
LOG(debug, "try add: mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str());
auto old = _map.find(mapping.name);
if (old != _map.end()) {
PerService & exists = old->second;
if (exists.spec == mapping.spec) {
LOG(debug, "added mapping %s->%s was already present",
mapping.name.c_str(), mapping.spec.c_str());
exists.localOnly = false;
return;
}
auto removed = removeFromMap(old);
LOG(warning, "added mapping %s->%s, but already had conflicting mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str(),
removed.mapping.name.c_str(), removed.mapping.spec.c_str());
if (removed.inflight) {
auto target = std::move(removed.inflight);
target->doneHandler(OkState(13, "conflict during initialization"));
}
if (removed.up) {
_dispatcher.remove(removed.mapping);
}
}
addToMap(mapping, globalService(mapping), false);
}
void LocalRpcMonitorMap::doRemove(const ServiceMapping &mapping) {
auto iter = _map.find(mapping.name);
if (iter != _map.end()) {
auto removed = removeFromMap(iter);
LOG(debug, "remove: mapping %s->%s",
removed.mapping.name.c_str(), removed.mapping.spec.c_str());
if (mapping.spec != removed.mapping.spec) {
LOG(warning, "inconsistent specs for name '%s': had '%s', but was asked to remove '%s'",
mapping.name.c_str(),
removed.mapping.spec.c_str(),
mapping.spec.c_str());
}
if (removed.inflight) {
auto target = std::move(removed.inflight);
target->doneHandler(OkState(13, "removed during initialization"));
}
if (removed.up) {
_dispatcher.remove(removed.mapping);
}
} else {
LOG(debug, "tried to remove non-existing mapping %s->%s",
mapping.name.c_str(), mapping.spec.c_str());
}
}
void LocalRpcMonitorMap::down(const ServiceMapping& mapping) {
PerService &psd = lookup(mapping);
LOG(debug, "failed: %s->%s", mapping.name.c_str(), psd.spec.c_str());
if (psd.inflight) {
auto target = std::move(psd.inflight);
target->doneHandler(OkState(13, "failed check using listNames callback"));
}
if (psd.localOnly) {
auto iter = _map.find(mapping.name);
auto removed = removeFromMap(iter);
if (removed.up) {
_dispatcher.remove(removed.mapping);
}
} else if (psd.up) {
psd.up = false;
_dispatcher.remove(mapping);
}
}
void LocalRpcMonitorMap::up(const ServiceMapping& mapping) {
PerService &psd = lookup(mapping);
LOG(debug, "ok: %s->%s", mapping.name.c_str(), psd.spec.c_str());
if (psd.inflight) {
auto target = std::move(psd.inflight);
target->doneHandler(OkState());
}
if (! psd.up) {
psd.up = true;
_dispatcher.add(mapping);
}
}
} // namespace slobrok
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