io.gravitee.gateway.reactive.handlers.api.adapter.invoker.ReadWriteStreamAdapter Maven / Gradle / Ivy

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/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * 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 io.gravitee.gateway.reactive.handlers.api.adapter.invoker;

import io.gravitee.gateway.api.ExecutionContext;
import io.gravitee.gateway.api.buffer.Buffer;
import io.gravitee.gateway.api.handler.Handler;
import io.gravitee.gateway.api.stream.ReadStream;
import io.gravitee.gateway.api.stream.SimpleReadWriteStream;
import io.gravitee.gateway.reactive.api.context.HttpRequest;
import io.gravitee.gateway.reactive.policy.adapter.context.ExecutionContextAdapter;
import io.gravitee.gateway.reactive.policy.adapter.context.RequestAdapter;
import io.reactivex.rxjava3.core.CompletableEmitter;

/**
 * This {@link ReadWriteStreamAdapter} is a {@link SimpleReadWriteStream} implementation that can be used when calling {@link io.gravitee.gateway.api.Invoker#invoke(ExecutionContext, ReadStream, Handler)}.
 *
 * @author Jeoffrey HAEYAERT (jeoffrey.haeyaert at graviteesource.com)
 * @author GraviteeSource Team
 */
class ReadWriteStreamAdapter extends SimpleReadWriteStream {

    /**
     * Creates a dedicated {@link io.gravitee.gateway.api.stream.ReadWriteStream}.
     * This constructor takes an {@link ExecutionContextAdapter} on which a {@link RequestAdapter} is attached.
     * This specific {@link RequestAdapter} allows to register a resume callback that will be invoked by the {@link io.gravitee.gateway.api.Invoker} when it will be ready to read the request body.
     *
     * @param ctx an {@link ExecutionContextAdapter} on which a {@link RequestAdapter} is attached to.
     * @param nextEmitter the reactive emitter that can be used to emit error in case of trouble.
     */
    public ReadWriteStreamAdapter(ExecutionContextAdapter ctx, CompletableEmitter nextEmitter) {
        final RequestAdapter requestAdapter = (RequestAdapter) ctx.request();
        final HttpRequest delegateRequest = ctx.getDelegate().request();

        requestAdapter.onResume(() -> {
            ctx.request().bodyHandler(this::write);
            ctx.request().endHandler(avoid -> this.end());

            final Handler bodyHandler = requestAdapter.getBodyHandler();
            final Handler endHandler = requestAdapter.getEndHandler();

            delegateRequest
                .chunks()
                .doOnNext(bodyHandler::handle)
                .doOnComplete(() -> endHandler.handle(null))
                .doOnError(nextEmitter::tryOnError)
                .onErrorResumeWith(e -> {})
                .subscribe();
        });
    }
}