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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class storage::Bouncer
* @ingroup storageserver
*
* @brief Denies messages from entering if state is not good.
*
* If we are not in up state, but process is still running, only a few
* messages should be allowed through. This link stops all messages not allowed.
*/
#pragma once
#include <vespa/config/helper/ifetchercallback.h>
#include <vespa/vdslib/state/nodestate.h>
#include <vespa/storage/common/nodestateupdater.h>
#include <vespa/storage/common/storagecomponent.h>
#include <vespa/storage/common/storagelink.h>
#include <vespa/storage/config/config-stor-bouncer.h>
#include <unordered_map>
namespace config {
class ConfigUri;
class ConfigFetcher;
}
namespace storage {
struct BouncerMetrics;
class Bouncer : public StorageLink,
private StateListener,
private config::IFetcherCallback<vespa::config::content::core::StorBouncerConfig>
{
std::unique_ptr<vespa::config::content::core::StorBouncerConfig> _config;
StorageComponent _component;
std::mutex _lock;
lib::NodeState _baselineNodeState;
using BucketSpaceNodeStateMapping = std::unordered_map<document::BucketSpace, lib::NodeState, document::BucketSpace::hash>;
BucketSpaceNodeStateMapping _derivedNodeStates;
const lib::State* _clusterState;
std::unique_ptr<config::ConfigFetcher> _configFetcher;
std::unique_ptr<BouncerMetrics> _metrics;
public:
Bouncer(StorageComponentRegister& compReg, const config::ConfigUri & configUri);
~Bouncer() override;
void print(std::ostream& out, bool verbose,
const std::string& indent) const override;
void configure(std::unique_ptr<vespa::config::content::core::StorBouncerConfig> config) override;
const BouncerMetrics& metrics() const noexcept;
private:
void validateConfig(const vespa::config::content::core::StorBouncerConfig&) const;
void onClose() override;
void abortCommandForUnavailableNode(api::StorageMessage&, const lib::State&);
void rejectCommandWithTooHighClockSkew(api::StorageMessage& msg, int maxClockSkewInSeconds);
void abortCommandDueToClusterDown(api::StorageMessage&, const lib::State&);
void rejectDueToInsufficientPriority(api::StorageMessage&, api::StorageMessage::Priority);
void reject_due_to_too_few_bucket_bits(api::StorageMessage&);
static bool clusterIsUp(const lib::State& cluster_state);
bool isDistributor() const;
bool isExternalLoad(const api::MessageType&) const noexcept;
bool isExternalWriteOperation(const api::MessageType&) const noexcept;
bool priorityRejectionIsEnabled(int configuredPriority) const noexcept {
return (configuredPriority != -1);
}
/**
* If msg is a command containing a mutating timestamp (put, remove or
* update commands), return that timestamp. Otherwise, return 0.
*/
uint64_t extractMutationTimestampIfAny(const api::StorageMessage& msg);
bool onDown(const std::shared_ptr<api::StorageMessage>&) override;
void handleNewState() noexcept override;
const lib::NodeState &getDerivedNodeState(document::BucketSpace bucketSpace) const;
void append_node_identity(std::ostream& target_stream) const;
};
} // storage
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