org.jboss.resteasy.reactive.server.vertx.serializers.ServerMutinyAsyncFileMessageBodyWriter Maven / Gradle / Ivy

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package org.jboss.resteasy.reactive.server.vertx.serializers;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import jakarta.ws.rs.WebApplicationException;
import jakarta.ws.rs.core.HttpHeaders;
import jakarta.ws.rs.core.MediaType;
import jakarta.ws.rs.core.MultivaluedMap;
import jakarta.ws.rs.ext.Provider;

import org.jboss.resteasy.reactive.server.core.ResteasyReactiveRequestContext;
import org.jboss.resteasy.reactive.server.spi.ResteasyReactiveResourceInfo;
import org.jboss.resteasy.reactive.server.spi.ServerHttpResponse;
import org.jboss.resteasy.reactive.server.spi.ServerMessageBodyWriter;
import org.jboss.resteasy.reactive.server.spi.ServerRequestContext;

import io.vertx.mutiny.core.file.AsyncFile;

@Provider
public class ServerMutinyAsyncFileMessageBodyWriter implements ServerMessageBodyWriter {

    @Override
    public boolean isWriteable(Class type, Type genericType, ResteasyReactiveResourceInfo target, MediaType mediaType) {
        return isWritable(type);
    }

    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return isWritable(type);
    }

    private boolean isWritable(Class type) {
        // allow for subtypes, such as AsyncFileImpl
        return AsyncFile.class.isAssignableFrom(type);
    }

    @Override
    public void writeResponse(AsyncFile file, Type genericType, ServerRequestContext context) throws WebApplicationException {
        ResteasyReactiveRequestContext ctx = ((ResteasyReactiveRequestContext) context);
        ctx.suspend();
        ServerHttpResponse response = context.serverResponse();
        // this is only set by nice people, unfortunately
        if (file.getReadLength() != Long.MAX_VALUE) {
            response.setResponseHeader(HttpHeaders.CONTENT_LENGTH, String.valueOf(file.getReadLength()));
        } else {
            response.setChunked(true);
        }
        file.handler(buffer -> {
            try {
                response.write(buffer.getBytes());
            } catch (Exception x) {
                // believe it or not, this throws
                ctx.resume(x);
                return;
            }
            if (response.isWriteQueueFull()) {
                file.pause();
                response.addDrainHandler(file::resume);
            }
        });

        file.endHandler(new Runnable() {
            @Override
            public void run() {
                // we don't need to wait for the file to be closed, we just need to make sure it does get closed
                //noinspection ResultOfMethodCallIgnored
                file.close().subscribeAsCompletionStage();
                response.end();
                // Not sure if I need to resume, actually
                ctx.resume();
            }
        });
    }

    @Override
    public void writeTo(AsyncFile asyncFile, Class type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        throw new UnsupportedOperationException("Returning an AsyncFile is not supported with WriterInterceptors");
    }
}