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Aerospike Java proxy client interface for database-as-a-service (dbaas).
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/*
 * Copyright 2012-2023 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * 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.
 */
package com.aerospike.client.proxy;

import java.util.concurrent.TimeUnit;

import com.aerospike.client.AerospikeException;
import com.aerospike.client.Log;
import com.aerospike.client.ResultCode;
import com.aerospike.client.command.Command;
import com.aerospike.client.policy.Policy;
import com.aerospike.client.proxy.grpc.GrpcCallExecutor;
import com.aerospike.client.proxy.grpc.GrpcConversions;
import com.aerospike.client.proxy.grpc.GrpcStreamingCall;
import com.aerospike.client.util.Util;
import com.aerospike.proxy.client.Kvs;
import com.google.protobuf.ByteString;

import io.grpc.MethodDescriptor;
import io.grpc.Status;
import io.grpc.StatusRuntimeException;
import io.grpc.stub.StreamObserver;

public abstract class CommandProxy {
	final Policy policy;
	private final GrpcCallExecutor executor;
	private final MethodDescriptor methodDescriptor;
	private long deadlineNanos;
	private int sendTimeoutMillis;
	private int iteration = 1;
	private final int numExpectedResponses;
	boolean inDoubt;

	public CommandProxy(
		MethodDescriptor methodDescriptor,
		GrpcCallExecutor executor,
		Policy policy,
		int numExpectedResponses
	) {
		this.methodDescriptor = methodDescriptor;
		this.executor = executor;
		this.policy = policy;
		this.numExpectedResponses = numExpectedResponses;
	}

	final void execute() {
		if (policy.totalTimeout > 0) {
			deadlineNanos = System.nanoTime() + TimeUnit.MILLISECONDS.toNanos(policy.totalTimeout);
			sendTimeoutMillis = (policy.socketTimeout > 0 && policy.socketTimeout < policy.totalTimeout)?
								 policy.socketTimeout : policy.totalTimeout;
		}
		else {
			deadlineNanos = 0; // No total deadline.
			sendTimeoutMillis = Math.max(policy.socketTimeout, 0);
		}

		executeCommand();
	}

	private void executeCommand() {
		long sendDeadlineNanos =
			(sendTimeoutMillis > 0) ?
				System.nanoTime() + TimeUnit.MILLISECONDS.toNanos(sendTimeoutMillis) : 0;

		Kvs.AerospikeRequestPayload.Builder builder = getRequestBuilder();

		executor.execute(new GrpcStreamingCall(methodDescriptor, builder,
			policy, iteration, deadlineNanos, sendDeadlineNanos, numExpectedResponses,
			new StreamObserver() {
				@Override
				public void onNext(Kvs.AerospikeResponsePayload response) {
					try {
						inDoubt |= response.getInDoubt();
						onResponse(response);
					}
					catch (Throwable t) {
						onFailure(t);
						// Re-throw to abort at the proxy/
						throw t;
					}
				}

				@Override
				public void onError(Throwable t) {
					inDoubt = true;
					onFailure(t);
				}

				@Override
				public void onCompleted() {
				}
			}));
	}

	boolean retry() {
		if (iteration > policy.maxRetries) {
			return false;
		}

		if (policy.totalTimeout > 0) {
			long remaining = deadlineNanos - System.nanoTime() - TimeUnit.MILLISECONDS.toNanos(policy.sleepBetweenRetries);

			if (remaining <= 0) {
				return false;
			}
		}

		iteration++;
		executor.getEventLoop().schedule(this::retryNow, policy.sleepBetweenRetries, TimeUnit.MILLISECONDS);
		return true;
	}

	private void retryNow() {
		try {
			executeCommand();
		}
		catch (AerospikeException ae) {
			notifyFailure(ae);
		}
		catch (Throwable t) {
			notifyFailure(new AerospikeException(ResultCode.CLIENT_ERROR, t));
		}
	}

	private void onFailure(Throwable t) {
		AerospikeException ae;

		try {
			if (t instanceof AerospikeException) {
				ae = (AerospikeException)t;

				if (ae.getResultCode() == ResultCode.TIMEOUT) {
					ae = new AerospikeException.Timeout(policy, false);
				}
			}
			else if (t instanceof StatusRuntimeException) {
				StatusRuntimeException sre = (StatusRuntimeException)t;
				Status.Code code = sre.getStatus().getCode();

				if (code == Status.Code.UNAVAILABLE) {
					if (retry()) {
						return;
					}
				}
				ae = GrpcConversions.toAerospike(sre, policy, iteration);
			}
			else {
				ae = new AerospikeException(ResultCode.CLIENT_ERROR, t);
			}
		}
		catch (AerospikeException ae2) {
			ae = ae2;
		}
		catch (Throwable t2) {
			ae = new AerospikeException(ResultCode.CLIENT_ERROR, t2);
		}

		notifyFailure(ae);
	}

	final void notifyFailure(AerospikeException ae) {
		try {
			ae.setPolicy(policy);
			ae.setIteration(iteration);
			ae.setInDoubt(inDoubt);
			onFailure(ae);
		}
		catch (Throwable t) {
			Log.error("onFailure() error: " + Util.getStackTrace(t));
		}
	}

	static void logOnSuccessError(Throwable t) {
		Log.error("onSuccess() error: " + Util.getStackTrace(t));
	}

	Kvs.AerospikeRequestPayload.Builder getRequestBuilder() {
		Command command = new Command(policy.socketTimeout, policy.totalTimeout, policy.maxRetries);
		writeCommand(command);

		ByteString payload = ByteString.copyFrom(command.dataBuffer, 0, command.dataOffset);
		return Kvs.AerospikeRequestPayload.newBuilder().setPayload(payload);
	}

	abstract void writeCommand(Command command);
	abstract void onResponse(Kvs.AerospikeResponsePayload response);
	abstract void onFailure(AerospikeException ae);
}