/*
 * Increment.actor.cpp
 *
 * This source file is part of the FoundationDB open source project
 *
 * Copyright 2013-2022 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.
 */

#include "fdbclient/NativeAPI.actor.h"
#include "fdbserver/TesterInterface.actor.h"
#include "fdbserver/workloads/workloads.actor.h"
#include "fdbserver/workloads/BulkSetup.actor.h"
#include "flow/actorcompiler.h" // This must be the last #include.

struct Increment : TestWorkload {
	int actorCount, nodeCount;
	double testDuration, transactionsPerSecond, minExpectedTransactionsPerSecond;

	std::vector<Future<Void>> clients;
	PerfIntCounter transactions, retries, tooOldRetries, commitFailedRetries;
	PerfDoubleCounter totalLatency;

	Increment(WorkloadContext const& wcx)
	  : TestWorkload(wcx), transactions("Transactions"), retries("Retries"), tooOldRetries("Retries.too_old"),
	    commitFailedRetries("Retries.commit_failed"), totalLatency("Latency") {
		testDuration = getOption(options, LiteralStringRef("testDuration"), 10.0);
		transactionsPerSecond = getOption(options, LiteralStringRef("transactionsPerSecond"), 5000.0);
		actorCount = getOption(options, LiteralStringRef("actorsPerClient"), transactionsPerSecond / 5);
		nodeCount = getOption(options, LiteralStringRef("nodeCount"), transactionsPerSecond * clientCount);
		minExpectedTransactionsPerSecond =
		    transactionsPerSecond * getOption(options, LiteralStringRef("expectedRate"), 0.7);
	}

	std::string description() const override { return "IncrementWorkload"; }

	Future<Void> setup(Database const& cx) override { return Void(); }
	Future<Void> start(Database const& cx) override {
		for (int c = 0; c < actorCount; c++)
			clients.push_back(
			    timeout(incrementClient(cx->clone(), this, actorCount / transactionsPerSecond), testDuration, Void()));
		return delay(testDuration);
	}
	Future<bool> check(Database const& cx) override {
		int errors = 0;
		for (int c = 0; c < clients.size(); c++)
			errors += clients[c].isError();
		if (errors)
			TraceEvent(SevError, "TestFailure").detail("Reason", "There were client errors.");
		clients.clear();
		return incrementCheck(cx->clone(), this, !errors);
	}
	void getMetrics(std::vector<PerfMetric>& m) override {
		m.push_back(transactions.getMetric());
		m.push_back(retries.getMetric());
		m.push_back(tooOldRetries.getMetric());
		m.push_back(commitFailedRetries.getMetric());
		m.emplace_back("Avg Latency (ms)", 1000 * totalLatency.getValue() / transactions.getValue(), Averaged::True);
		m.emplace_back("Read rows/simsec (approx)", transactions.getValue() * 3 / testDuration, Averaged::False);
		m.emplace_back("Write rows/simsec (approx)", transactions.getValue() * 4 / testDuration, Averaged::False);
	}

	static Key intToTestKey(int i) { return StringRef(format("%016d", i)); }

	ACTOR Future<Void> incrementClient(Database cx, Increment* self, double delay) {
		state double lastTime = now();
		try {
			loop {
				wait(poisson(&lastTime, delay));

				state double tstart = now();
				state Transaction tr(cx);
				while (true) {
					try {
						tr.atomicOp(intToTestKey(deterministicRandom()->randomInt(0, self->nodeCount / 2)),
						            LiteralStringRef("\x01"),
						            MutationRef::AddValue);
						tr.atomicOp(
						    intToTestKey(deterministicRandom()->randomInt(self->nodeCount / 2, self->nodeCount)),
						    LiteralStringRef("\x01"),
						    MutationRef::AddValue);
						wait(tr.commit());
						break;
					} catch (Error& e) {
						if (e.code() == error_code_transaction_too_old)
							++self->tooOldRetries;
						else if (e.code() == error_code_not_committed)
							++self->commitFailedRetries;
						wait(tr.onError(e));
					}
					++self->retries;
				}
				++self->transactions;
				self->totalLatency += now() - tstart;
			}
		} catch (Error& e) {
			TraceEvent(SevError, "IncrementClient").error(e);
			throw;
		}
	}
	bool incrementCheckData(const VectorRef<KeyValueRef>& data, Version v, Increment* self) {
		CODE_PROBE(self->transactions.getValue(), "incrementCheckData transaction has value");
		if (self->transactions.getValue() && data.size() == 0) {
			TraceEvent(SevError, "TestFailure")
			    .detail("Reason", "No successful increments")
			    .detail("Before", nodeCount)
			    .detail("After", data.size())
			    .detail("Version", v);
			return false;
		}
		int firstSum = 0;
		int secondSum = 0;
		for (auto it : data) {
			ASSERT(it.value.size() <= sizeof(uint64_t));
			uint64_t intValue = 0;
			memcpy(&intValue, it.value.begin(), it.value.size());
			if (it.key < intToTestKey(nodeCount / 2)) {
				firstSum += intValue;
			} else {
				secondSum += intValue;
			}
		}
		if (firstSum != secondSum) {
			TraceEvent(SevError, "TestFailure")
			    .detail("Reason", "Bad increments")
			    .detail("A", firstSum)
			    .detail("B", secondSum);
			return false;
		}
		return true;
	}
	ACTOR Future<bool> incrementCheck(Database cx, Increment* self, bool ok) {
		if (self->transactions.getMetric().value() < self->testDuration * self->minExpectedTransactionsPerSecond) {
			TraceEvent(SevWarnAlways, "TestFailure")
			    .detail("Reason", "Rate below desired rate")
			    .detail("File", __FILE__)
			    .detail(
			        "Details",
			        format("%.2f",
			               self->transactions.getMetric().value() / (self->transactionsPerSecond * self->testDuration)))
			    .detail("TransactionsAchieved", self->transactions.getMetric().value())
			    .detail("MinTransactionsExpected", self->testDuration * self->minExpectedTransactionsPerSecond)
			    .detail("TransactionGoal", self->transactionsPerSecond * self->testDuration);
			ok = false;
		}
		if (!self->clientId) {
			// One client checks the validity of the cycle
			state Transaction tr(cx);
			state int retryCount = 0;
			loop {
				try {
					state Version v = wait(tr.getReadVersion());
					RangeResult data = wait(tr.getRange(firstGreaterOrEqual(intToTestKey(0)),
					                                    firstGreaterOrEqual(intToTestKey(self->nodeCount)),
					                                    self->nodeCount + 1));
					ok = self->incrementCheckData(data, v, self) && ok;
					break;
				} catch (Error& e) {
					retryCount++;
					TraceEvent(retryCount > 20 ? SevWarnAlways : SevWarn, "IncrementCheckError").error(e);
					wait(tr.onError(e));
				}
			}
		}
		return ok;
	}
};

WorkloadFactory<Increment> IncrementWorkloadFactory("Increment");