| /* |
| * 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.zeppelin.ksql; |
| |
| import org.apache.commons.io.IOUtils; |
| |
| import java.io.BufferedReader; |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStream; |
| import java.net.HttpURLConnection; |
| import java.net.URL; |
| import java.nio.charset.StandardCharsets; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.stream.Collectors; |
| |
| public class BasicKSQLHttpClient implements Closeable { |
| |
| interface BasicHTTPClientResponse { |
| void onMessage(int status, String message); |
| |
| void onError(int status, String message); |
| } |
| |
| private final String jsonData; |
| private final Map<String, Object> formData; |
| private final String type; |
| private final Map<String, String> headers; |
| private final URL url; |
| private HttpURLConnection connection; |
| private final int timeout; |
| private boolean connected; |
| |
| |
| public BasicKSQLHttpClient(String url, String jsonData, Map<String, Object> formData, |
| String type, Map<String, String> headers, int timeout) |
| throws IOException { |
| this.url = new URL(url); |
| this.jsonData = jsonData; |
| this.formData = formData; |
| this.type = type; |
| this.headers = headers; |
| this.timeout = timeout; |
| this.connected = false; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| connected = false; |
| if (connection != null) { |
| connection.disconnect(); |
| } |
| } |
| |
| private void writeOutput(String data) throws IOException { |
| try (OutputStream os = connection.getOutputStream()) { |
| byte[] input = data.getBytes(StandardCharsets.UTF_8); |
| os.write(input); |
| } |
| } |
| |
| public String connect() throws IOException { |
| int status = createConnection(); |
| boolean isStatusOk = isStatusOk(status); |
| return IOUtils.toString(isStatusOk ? |
| connection.getInputStream() : connection.getErrorStream(), StandardCharsets.UTF_8.name()); |
| } |
| |
| public void connectAsync(BasicHTTPClientResponse onResponse) throws IOException { |
| int status = createConnection(); |
| boolean isStatusOk = isStatusOk(status); |
| long start = System.currentTimeMillis(); |
| |
| try (InputStreamReader in = new InputStreamReader(connection.getInputStream(), |
| StandardCharsets.UTF_8); |
| BufferedReader br = new BufferedReader(in)) { |
| while (connected && (timeout == -1 || System.currentTimeMillis() - start < timeout)) { |
| if (br.ready()) { |
| String responseLine = br.readLine(); |
| if (responseLine == null || responseLine.isEmpty()) { |
| continue; |
| } |
| if (isStatusOk) { |
| onResponse.onMessage(status, responseLine.trim()); |
| } else { |
| onResponse.onError(status, responseLine.trim()); |
| } |
| } |
| } |
| } |
| } |
| |
| private boolean isStatusOk(int status) { |
| return status >= 200 && status < 300; |
| } |
| |
| private int createConnection() throws IOException { |
| this.connection = (HttpURLConnection) url.openConnection(); |
| connection.setRequestMethod(this.type); |
| this.headers.forEach((k, v) -> connection.setRequestProperty(k, v)); |
| connection.setDoOutput(true); |
| if (jsonData != null && !jsonData.isEmpty()) { |
| writeOutput(jsonData); |
| } else if (formData != null && !formData.isEmpty()) { |
| String queryStringParams = formData.entrySet() |
| .stream() |
| .map(e -> e.getKey() + "=" + e.getValue()) |
| .collect(Collectors.joining("&")); |
| writeOutput(queryStringParams); |
| } |
| connected = true; |
| return connection.getResponseCode(); |
| } |
| |
| static class Builder { |
| private String url; |
| private String json; |
| private Map<String, Object> formData = new HashMap<>(); |
| private String type; |
| private Map<String, String> headers = new HashMap<>(); |
| private int timeout = -1; |
| |
| public Builder withTimeout(int timeout) { |
| this.timeout = timeout; |
| return this; |
| } |
| |
| public Builder withUrl(String url) { |
| this.url = url; |
| return this; |
| } |
| |
| public Builder withJson(String json) { |
| this.json = json; |
| return this; |
| } |
| |
| public Builder withType(String type) { |
| this.type = type; |
| return this; |
| } |
| |
| public Builder withHeader(String header, String value) { |
| this.headers.put(header, value); |
| return this; |
| } |
| |
| public Builder withFormData(String name, Object value) { |
| this.formData.put(name, value); |
| return this; |
| } |
| |
| public BasicKSQLHttpClient build() throws IOException { |
| return new BasicKSQLHttpClient(url, json, formData, type, headers, timeout); |
| } |
| |
| } |
| } |