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Camel component for gRPC (Remote Procedure Call) support
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.grpc;

import org.apache.camel.Category;
import org.apache.camel.Consumer;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.UriEndpoint;
import org.apache.camel.spi.UriParam;
import org.apache.camel.support.DefaultEndpoint;
import org.apache.camel.support.SynchronousDelegateProducer;
import org.apache.camel.util.ObjectHelper;

/**
 * Expose gRPC endpoints and access external gRPC endpoints.
 */
@UriEndpoint(firstVersion = "2.19.0", scheme = "grpc", title = "gRPC", syntax = "grpc:host:port/service",
             category = { Category.RPC }, headersClass = GrpcConstants.class)
@Metadata(annotations = {
        "protocol=http",
})
public class GrpcEndpoint extends DefaultEndpoint {
    @UriParam
    protected final GrpcConfiguration configuration;

    private String serviceName;
    private String servicePackage;

    public GrpcEndpoint(String uri, GrpcComponent component, GrpcConfiguration config) {
        super(uri, component);
        this.configuration = config;
    }

    public GrpcConfiguration getConfiguration() {
        return configuration;
    }

    @Override
    public Producer createProducer() throws Exception {
        if (configuration.isToRouteControlledStreamObserver()) {
            return new GrpcProducerToRouteControlledStreamObserver(this);
        }
        GrpcProducer producer = new GrpcProducer(this, configuration);
        if (configuration.isSynchronous()) {
            return new SynchronousDelegateProducer(producer);
        } else {
            return producer;
        }
    }

    @Override
    public Consumer createConsumer(Processor processor) throws Exception {
        GrpcConsumer consumer = new GrpcConsumer(this, processor, configuration);
        configureConsumer(consumer);
        return consumer;
    }

    @Override
    protected void doInit() throws Exception {
        super.doInit();

        // Extract service and package names from the full service name
        serviceName = GrpcUtils.extractServiceName(configuration.getService());
        servicePackage = GrpcUtils.extractServicePackage(configuration.getService());

        // Convert method name to the camel case style
        // This requires if method name as described inside .proto file directly
        if (!ObjectHelper.isEmpty(configuration.getMethod())) {
            configuration.setMethod(GrpcUtils.convertMethod2CamelCase(configuration.getMethod()));
        }
    }

    public String getServiceName() {
        return serviceName;
    }

    public String getServicePackage() {
        return servicePackage;
    }
}