discord4j.gateway.payload.JacksonPayloadReader Maven / Gradle / Ivy

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/*
 * This file is part of Discord4J.
 *
 * Discord4J is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Discord4J is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Discord4J. If not, see .
 */
package discord4j.gateway.payload;

import com.fasterxml.jackson.databind.ObjectMapper;
import discord4j.gateway.json.GatewayPayload;
import io.netty.buffer.ByteBuf;
import reactor.core.Exceptions;
import reactor.util.Logger;
import reactor.util.Loggers;

import java.io.IOException;
import java.nio.charset.Charset;

public class JacksonPayloadReader implements PayloadReader {

    private static final Logger log = Loggers.getLogger(JacksonPayloadReader.class);

    private final ObjectMapper mapper;
    private final boolean lenient;

    public JacksonPayloadReader(ObjectMapper mapper) {
        this(mapper, true);
    }

    public JacksonPayloadReader(ObjectMapper mapper, boolean lenient) {
        this.mapper = mapper;
        this.lenient = lenient;
    }

    @Override
    public GatewayPayload read(ByteBuf payload) {
        try {
            return mapper.readValue(payload.array(), GatewayPayload.class);
        } catch (IOException e) {
            if (lenient) {
                // if eof input - just ignore
                if (payload.readableBytes() > 0) {
                    log.warn("Error while decoding JSON ({} bytes): {}", payload.readableBytes(),
                            payload.toString(Charset.forName("UTF-8")), e);
                }
                return new GatewayPayload<>();
            } else {
                throw Exceptions.propagate(e);
            }
        }
    }
}