io.wcm.caravan.commons.httpasyncclient.impl.HttpAsyncClientItem.java Source code

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Here is the source code for io.wcm.caravan.commons.httpasyncclient.impl.HttpAsyncClientItem.java

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/*
 * #%L
 * wcm.io
 * %%
 * Copyright (C) 2014 wcm.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.
 * #L%
 */
package io.wcm.caravan.commons.httpasyncclient.impl;

import java.io.IOException;
import java.security.GeneralSecurityException;

import javax.net.ssl.SSLContext;

import org.apache.commons.lang3.StringUtils;
import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.ProxyAuthenticationStrategy;
import org.apache.http.impl.nio.client.CloseableHttpAsyncClient;
import org.apache.http.impl.nio.client.HttpAsyncClientBuilder;
import org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager;
import org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor;
import org.apache.http.impl.nio.reactor.IOReactorConfig;
import org.apache.http.nio.conn.NoopIOSessionStrategy;
import org.apache.http.nio.conn.SchemeIOSessionStrategy;
import org.apache.http.nio.conn.ssl.SSLIOSessionStrategy;
import org.apache.http.nio.reactor.ConnectingIOReactor;
import org.apache.http.nio.reactor.IOReactorException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import io.wcm.caravan.commons.httpclient.HttpClientConfig;
import io.wcm.caravan.commons.httpclient.impl.helpers.CertificateLoader;

/**
 * Item for {@link HttpAsyncClientFactoryImpl} for each {@link HttpClientConfig} configured.
 */
class HttpAsyncClientItem {

    private final HttpClientConfig config;
    private final PoolingNHttpClientConnectionManager asyncConnectionManager;
    private final CloseableHttpAsyncClient httpAsyncClient;

    private static final Logger log = LoggerFactory.getLogger(HttpAsyncClientItem.class);

    /**
     * @param config Http client configuration
     */
    HttpAsyncClientItem(HttpClientConfig config) {
        this.config = config;

        // optional SSL client certificate support
        SSLContext sslContext;
        if (CertificateLoader.isSslKeyManagerEnabled(config) || CertificateLoader.isSslTrustStoreEnbaled(config)) {
            try {
                sslContext = CertificateLoader.buildSSLContext(config);
            } catch (IOException | GeneralSecurityException ex) {
                throw new IllegalArgumentException("Invalid SSL client certificate configuration.", ex);
            }
        } else {
            sslContext = CertificateLoader.createDefaultSSlContext();
        }

        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        // optional proxy authentication
        if (StringUtils.isNotEmpty(config.getProxyUser())) {
            credentialsProvider.setCredentials(new AuthScope(config.getProxyHost(), config.getProxyPort()),
                    new UsernamePasswordCredentials(config.getProxyUser(), config.getProxyPassword()));
        }
        // optional http basic authentication support
        if (StringUtils.isNotEmpty(config.getHttpUser())) {
            credentialsProvider.setCredentials(AuthScope.ANY,
                    new UsernamePasswordCredentials(config.getHttpUser(), config.getHttpPassword()));
        }

        // build http clients
        asyncConnectionManager = buildAsyncConnectionManager(config, sslContext);
        httpAsyncClient = buildHttpAsyncClient(config, asyncConnectionManager, credentialsProvider);

        // start async client
        httpAsyncClient.start();
    }

    private static PoolingNHttpClientConnectionManager buildAsyncConnectionManager(HttpClientConfig config,
            SSLContext sslContext) {
        // scheme configuration
        SchemeIOSessionStrategy sslSocketFactory = new SSLIOSessionStrategy(sslContext);
        Registry<SchemeIOSessionStrategy> asyncSchemeRegistry = RegistryBuilder.<SchemeIOSessionStrategy>create()
                .register("http", NoopIOSessionStrategy.INSTANCE).register("https", sslSocketFactory).build();

        // pooling settings
        ConnectingIOReactor ioreactor;
        try {
            ioreactor = new DefaultConnectingIOReactor(IOReactorConfig.DEFAULT);
        } catch (IOReactorException ex) {
            throw new RuntimeException("Unable to initialize IO reactor.", ex);
        }
        PoolingNHttpClientConnectionManager conmgr = new PoolingNHttpClientConnectionManager(ioreactor,
                asyncSchemeRegistry);
        conmgr.setMaxTotal(config.getMaxTotalConnections());
        conmgr.setDefaultMaxPerRoute(config.getMaxConnectionsPerHost());
        return conmgr;
    }

    private static CloseableHttpAsyncClient buildHttpAsyncClient(HttpClientConfig config,
            PoolingNHttpClientConnectionManager connectionManager, CredentialsProvider credentialsProvider) {

        // prepare HTTPClient builder
        HttpAsyncClientBuilder httpClientAsyncBuilder = HttpAsyncClientBuilder.create()
                .setConnectionManager(connectionManager);

        // timeout settings
        httpClientAsyncBuilder.setDefaultRequestConfig(RequestConfig.custom()
                .setConnectTimeout(config.getConnectTimeout()).setSocketTimeout(config.getSocketTimeout()).build());

        httpClientAsyncBuilder.setDefaultCredentialsProvider(credentialsProvider);

        // optional proxy support
        if (StringUtils.isNotEmpty(config.getProxyHost())) {
            httpClientAsyncBuilder.setProxy(new HttpHost(config.getProxyHost(), config.getProxyPort()));

            // optional proxy authentication
            if (StringUtils.isNotEmpty(config.getProxyUser())) {
                httpClientAsyncBuilder.setProxyAuthenticationStrategy(new ProxyAuthenticationStrategy());
            }
        }

        return httpClientAsyncBuilder.build();
    }

    /**
     * @return Http client instance (asynchronous)
     */
    public CloseableHttpAsyncClient getHttpAsyncClient() {
        return httpAsyncClient;
    }

    /**
     * @param hostName Host name
     * @param wsAddressingToURI WS addressing "to" URI
     * @return true if host name is associated with this http client config
     */
    public boolean matches(String hostName, String wsAddressingToURI) {
        return config.isEnabled() && config.matchesHost(hostName)
                && config.matchesWsAddressingToUri(wsAddressingToURI);
    }

    /**
     * Close underlying http clients.
     */
    public void close() {
        try {
            httpAsyncClient.close();
        } catch (IOException ex) {
            log.warn("Error closing async HTTP client.", ex);
        }
    }

    @Override
    public String toString() {
        return "HttpClientItem[" + config.toString() + "]";
    }

}