/*
 * RatekeeperInterface.h
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2019 Apple Inc. and the FoundationDB project authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef FDBSERVER_RATEKEEPERINTERFACE_H
#define FDBSERVER_RATEKEEPERINTERFACE_H

#include "fdbclient/FDBTypes.h"
#include "fdbrpc/fdbrpc.h"
#include "fdbrpc/Locality.h"

struct RatekeeperInterface {
	constexpr static FileIdentifier file_identifier = 5983305;
	RequestStream<ReplyPromise<Void>> waitFailure;
	RequestStream<struct GetRateInfoRequest> getRateInfo;
	RequestStream<struct HaltRatekeeperRequest> haltRatekeeper;
	struct LocalityData locality;
	UID myId;

	RatekeeperInterface() {}
	explicit RatekeeperInterface(const struct LocalityData& l, UID id) : locality(l), myId(id) {}

	void initEndpoints() {}
	UID id() const { return myId; }
	NetworkAddress address() const { return getRateInfo.getEndpoint().getPrimaryAddress(); }
	bool operator== (const RatekeeperInterface& r) const {
		return id() == r.id();
	}
	bool operator!= (const RatekeeperInterface& r) const {
		return !(*this == r);
	}

	template <class Archive>
	void serialize(Archive& ar) {
		serializer(ar, waitFailure, getRateInfo, haltRatekeeper, locality, myId);
	}
};

struct ClientTagThrottleLimits {
	double tpsRate;
	double expiration;

	ClientTagThrottleLimits() : tpsRate(0), expiration(0) {}
	ClientTagThrottleLimits(double tpsRate, double expiration) : tpsRate(tpsRate), expiration(expiration) {}

	template <class Archive>
	void serialize(Archive& ar) {
		// Convert expiration time to a duration to avoid clock differences
		double duration = 0;
		if(!ar.isDeserializing) {
			duration = expiration - now();
		}

		serializer(ar, tpsRate, duration);

		if(ar.isDeserializing) {
			expiration = now() + duration;
		}
	}
};

struct GetRateInfoReply {
	constexpr static FileIdentifier file_identifier = 7845006;
	double transactionRate;
	double batchTransactionRate;
	double leaseDuration;
	HealthMetrics healthMetrics;

	Optional<PrioritizedTransactionTagMap<ClientTagThrottleLimits>> throttledTags;

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, transactionRate, batchTransactionRate, leaseDuration, healthMetrics, throttledTags);
	}
};

struct GetRateInfoRequest {
	constexpr static FileIdentifier file_identifier = 9068521;
	UID requesterID;
	int64_t totalReleasedTransactions;
	int64_t batchReleasedTransactions;

	TransactionTagMap<uint64_t> throttledTagCounts;
	bool detailed;
	ReplyPromise<struct GetRateInfoReply> reply;

	GetRateInfoRequest() {}
	GetRateInfoRequest(UID const& requesterID, int64_t totalReleasedTransactions, int64_t batchReleasedTransactions, TransactionTagMap<uint64_t> throttledTagCounts, bool detailed)
		: requesterID(requesterID), totalReleasedTransactions(totalReleasedTransactions), batchReleasedTransactions(batchReleasedTransactions), throttledTagCounts(throttledTagCounts), detailed(detailed) {}

	template <class Ar>
	void serialize(Ar& ar) {
		serializer(ar, requesterID, totalReleasedTransactions, batchReleasedTransactions, throttledTagCounts, detailed, reply);
	}
};

struct HaltRatekeeperRequest {
	constexpr static FileIdentifier file_identifier = 6997218;
	UID requesterID;
	ReplyPromise<Void> reply;

	HaltRatekeeperRequest() {}
	explicit HaltRatekeeperRequest(UID uid) : requesterID(uid) {}

	template<class Ar>
	void serialize(Ar& ar) {
		serializer(ar, requesterID, reply);
	}
};

#endif //FDBSERVER_RATEKEEPERINTERFACE_H