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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "configretriever.h"
#include <vespa/config/common/exceptions.h>
#include <vespa/config/subscription/sourcespec.h>
#include <cassert>
namespace config {
const vespalib::duration ConfigRetriever::DEFAULT_SUBSCRIBE_TIMEOUT(60s);
const vespalib::duration ConfigRetriever::DEFAULT_NEXTGENERATION_TIMEOUT(60s);
ConfigRetriever::ConfigRetriever(const ConfigKeySet & bootstrapSet,
std::shared_ptr<IConfigContext> context,
vespalib::duration subscribeTimeout)
: _bootstrapSubscriber(bootstrapSet, context, subscribeTimeout),
_configSubscriber(),
_lock(),
_subscriptionList(),
_lastKeySet(),
_context(context),
_generation(-1),
_subscribeTimeout(subscribeTimeout),
_bootstrapRequired(true),
_closed(false)
{
}
ConfigRetriever::~ConfigRetriever() = default;
ConfigSnapshot
ConfigRetriever::getBootstrapConfigs(vespalib::duration timeout)
{
bool ret = _bootstrapSubscriber.nextGeneration(timeout);
if (!ret) {
return ConfigSnapshot();
}
_bootstrapRequired = false;
return _bootstrapSubscriber.getConfigSnapshot();
}
ConfigSnapshot
ConfigRetriever::getConfigs(const ConfigKeySet & keySet, vespalib::duration timeout)
{
if (isClosed())
return ConfigSnapshot();
if (_bootstrapRequired) {
throw ConfigRuntimeException("Cannot change keySet until bootstrap getBootstrapConfigs() has been called");
}
assert(!keySet.empty());
if (keySet != _lastKeySet) {
_lastKeySet = keySet;
{
std::lock_guard guard(_lock);
if (isClosed())
return ConfigSnapshot();
_configSubscriber = std::make_unique<GenericConfigSubscriber>(_context);
}
_subscriptionList.clear();
for (const auto & key : keySet) {
_subscriptionList.push_back(_configSubscriber->subscribe(key, _subscribeTimeout));
}
}
// Try update the subscribers generation if older than bootstrap
if (_configSubscriber->getGeneration() < _bootstrapSubscriber.getGeneration())
_configSubscriber->nextGeneration(timeout);
// If we failed to get a new generation, the user should call us again.
if (_configSubscriber->getGeneration() < _bootstrapSubscriber.getGeneration()) {
return ConfigSnapshot();
}
// If we are not in sync, even though we got a new generation, we should get
// another bootstrap.
_bootstrapRequired = _configSubscriber->getGeneration() > _bootstrapSubscriber.getGeneration();
if (_bootstrapRequired)
return ConfigSnapshot();
_generation = _configSubscriber->getGeneration();
return ConfigSnapshot(_subscriptionList, _generation);
}
void
ConfigRetriever::close()
{
std::lock_guard guard(_lock);
_closed.store(true, std::memory_order_relaxed);
_bootstrapSubscriber.close();
if (_configSubscriber)
_configSubscriber->close();
}
bool
ConfigRetriever::isClosed() const
{
return _closed.load(std::memory_order_relaxed);
}
}
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