add headers for HTTP Config Retriever

HttpConfigStore.java

/*
 * Copyright (c) 2014 Red Hat, Inc. and others
 *
 * Red Hat 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 io.vertx.config.impl.spi;

import io.vertx.config.spi.ConfigStore;
import io.vertx.core.AsyncResult;
import io.vertx.core.Future;
import io.vertx.core.Handler;
import io.vertx.core.MultiMap;
import io.vertx.core.buffer.Buffer;
import io.vertx.core.http.HttpClient;
import io.vertx.core.http.HttpClientRequest;

/**
 * A configuration store retrieving the configuration from a HTTP location
 *
 * @author <a href="http://escoffier.me">Clement Escoffier</a>
 */
public class HttpConfigStore implements ConfigStore {

  private final String host;
  private final int port;
  private final String path;
  private final HttpClient client;
  private final MultiMap headers;

  public HttpConfigStore(String host, int port, String path, HttpClient client, MultiMap headers) {
    this.host = host;
    this.port = port;
    this.path = path;
    this.client = client;
    this.headers = headers;
  }

  @Override
  public void get(Handler<AsyncResult<Buffer>> completionHandler) {
    HttpClientRequest request = client.get(port, host, path, response ->
      response
        .exceptionHandler(t -> completionHandler.handle(Future.failedFuture(t)))
        .bodyHandler(buffer -> completionHandler.handle(Future.succeededFuture(buffer)))
    );
    request.headers().addAll(headers);
    request
      .exceptionHandler(t -> completionHandler.handle(Future.failedFuture(t)))
      .end();
  }

  @Override
  public void close(Handler<Void> completionHandler) {
    this.client.close();
    completionHandler.handle(null);
  }
}

HttpConfigStoreFactory.java

/*
 * Copyright (c) 2014 Red Hat, Inc. and others
 *
 * Red Hat 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 io.vertx.config.impl.spi;

import io.vertx.config.spi.ConfigStore;
import io.vertx.config.spi.ConfigStoreFactory;
import io.vertx.core.MultiMap;
import io.vertx.core.Vertx;
import io.vertx.core.http.HttpClient;
import io.vertx.core.http.HttpClientOptions;
import io.vertx.core.json.JsonObject;

import java.util.Objects;

/**
 * The factory creating Json File configuration stores.
 *
 * @author <a href="http://escoffier.me">Clement Escoffier</a>
 */
public class HttpConfigStoreFactory implements ConfigStoreFactory {

  @Override
  public String name() {
    return "http";
  }

  @Override
  public ConfigStore create(Vertx vertx, JsonObject configuration) {
    HttpClient client = vertx.createHttpClient(new HttpClientOptions(configuration));
    String host = configuration.getString("host");
    int port = configuration.getInteger("port", 80);
    String path = configuration.getString("path", "/");
    /*
    {
      "headers" : {
        "Content-Type" : "application/json",
        "Cookie" : "value"
      }
     */
    MultiMap headers = MultiMap.caseInsensitiveMultiMap();
    JsonObject headersAsJson = configuration.getJsonObject("headers", new JsonObject());
    headersAsJson.fieldNames().forEach(headerName -> {
      String headerValue = headersAsJson.getString(headerName, "").trim();
      if (!headerValue.isEmpty()) {
        headers.add(headerName, headerValue);
      }
    });
    Objects.requireNonNull(host);

    return new HttpConfigStore(host, port, path, client, headers);
  }
}