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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 com.aerospike.client.AerospikeException;
import com.aerospike.client.Key;
import com.aerospike.client.Record;
import com.aerospike.client.ResultCode;
import com.aerospike.client.command.Command;
import com.aerospike.client.listener.RecordListener;
import com.aerospike.client.policy.Policy;
import com.aerospike.client.proxy.grpc.GrpcCallExecutor;
import com.aerospike.proxy.client.KVSGrpc;
import com.aerospike.proxy.client.Kvs;

import io.grpc.MethodDescriptor;

public class ReadCommandProxy extends SingleCommandProxy {
	private final RecordListener listener;
	final Key key;
	private final String[] binNames;
	private final boolean isOperation;

	public ReadCommandProxy(
		GrpcCallExecutor executor,
		RecordListener listener,
		Policy policy,
		Key key,
		String[] binNames
	) {
		super(KVSGrpc.getReadStreamingMethod(), executor, policy);
		this.listener = listener;
		this.key = key;
		this.binNames = binNames;
		this.isOperation = false;
	}

	public ReadCommandProxy(
		MethodDescriptor methodDescriptor,
		GrpcCallExecutor executor,
		RecordListener listener,
		Policy policy,
		Key key,
		boolean isOperation
	) {
		super(methodDescriptor, executor, policy);
		this.listener = listener;
		this.key = key;
		this.binNames = null;
		this.isOperation = isOperation;
	}

	@Override
	void writeCommand(Command command) {
		command.setRead(policy, key, binNames);
	}

	@Override
	void parseResult(Parser parser) {
		Record record = parseRecordResult(parser);

		try {
			listener.onSuccess(key, record);
		}
		catch (Throwable t) {
			logOnSuccessError(t);
		}
	}

	protected final Record parseRecordResult(Parser parser) {
		Record record = null;
		int resultCode = parser.parseHeader();

		switch (resultCode) {
			case ResultCode.OK:
				parser.skipKey();
				if (parser.opCount == 0) {
					// Bin data was not returned.
					record = new Record(null, parser.generation, parser.expiration);
				}
				else {
					record = parser.parseRecord(isOperation);
				}
				break;

			case ResultCode.KEY_NOT_FOUND_ERROR:
				handleNotFound(resultCode);
				break;

			case ResultCode.FILTERED_OUT:
				if (policy.failOnFilteredOut) {
					throw new AerospikeException(resultCode);
				}
				break;

			case ResultCode.UDF_BAD_RESPONSE:
				parser.skipKey();
				record = parser.parseRecord(isOperation);
				handleUdfError(record, resultCode);
				break;

			default:
				throw new AerospikeException(resultCode);
		}

		return record;
	}

	protected void handleNotFound(int resultCode) {
		// Do nothing in default case. Record will be null.
	}

	private void handleUdfError(Record record, int resultCode) {
		String ret = (String)record.bins.get("FAILURE");

		if (ret == null) {
			throw new AerospikeException(resultCode);
		}

		String message;
		int code;

		try {
			String[] list = ret.split(":");
			code = Integer.parseInt(list[2].trim());
			message = list[0] + ':' + list[1] + ' ' + list[3];
		}
		catch (Exception e) {
			// Use generic exception if parse error occurs.
			throw new AerospikeException(resultCode, ret);
		}

		throw new AerospikeException(code, message);
	}

	@Override
	void onFailure(AerospikeException ae) {
		listener.onFailure(ae);
	}
}