package org.apache.helix.rest.client; /* * 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. */ import java.io.IOException; import java.util.HashMap; import java.util.List; import java.util.Map; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import com.google.common.annotations.VisibleForTesting; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; class CustomRestClientImpl implements CustomRestClient { private static final Logger LOG = LoggerFactory.getLogger(CustomRestClient.class); // postfix used to append at the end of base url private static final String INSTANCE_HEALTH_STATUS = "/instanceHealthStatus"; private static final String PARTITION_HEALTH_STATUS = "/partitionHealthStatus"; private static final String IS_HEALTHY_FIELD = "IS_HEALTHY"; private static final String PARTITIONS = "partitions"; private static final String ACCEPT_CONTENT_TYPE = "application/json"; private static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); private HttpClient _httpClient; private interface JsonConverter { Map<String, Boolean> convert(JsonNode jsonNode); } public CustomRestClientImpl(HttpClient httpClient) { _httpClient = httpClient; } @Override public Map<String, Boolean> getInstanceStoppableCheck(String baseUrl, Map<String, String> customPayloads) throws IOException { // example url: http://<baseUrl>/instanceHealthStatus, assuming the base url already directly // queries at the instance String url = baseUrl + INSTANCE_HEALTH_STATUS; JsonConverter jsonConverter = jsonNode -> { Map<String, Boolean> result = new HashMap<>(); jsonNode.fields().forEachRemaining(kv -> result.put(kv.getKey(), kv.getValue().asBoolean())); return result; }; return handleResponse(post(url, customPayloads), jsonConverter); } @Override public Map<String, Boolean> getPartitionStoppableCheck(String baseUrl, List<String> partitions, Map<String, String> customPayloads) throws IOException { /* * example url: http://<baseUrl>/partitionHealthStatus -d { * "partitions" : ["p1", "p3", "p9"], * "<key>": "<value>", * ... * } */ String url = baseUrl + PARTITION_HEALTH_STATUS; // To avoid ImmutableMap as parameter Map<String, String> payLoads = new HashMap<>(customPayloads); // Add the entry: "partitions" : ["p1", "p3", "p9"] payLoads.put(PARTITIONS, partitions.toString()); JsonConverter jsonConverter = jsonNode -> { Map<String, Boolean> result = new HashMap<>(); jsonNode.fields().forEachRemaining( kv -> result.put(kv.getKey(), kv.getValue().get(IS_HEALTHY_FIELD).asBoolean())); return result; }; return handleResponse(post(url, payLoads), jsonConverter); } @VisibleForTesting protected JsonNode getJsonObject(HttpResponse httpResponse) throws IOException { HttpEntity httpEntity = httpResponse.getEntity(); String str = EntityUtils.toString(httpEntity); LOG.info("Converting Response Content {} to JsonNode", str); return OBJECT_MAPPER.readTree(str); } private Map<String, Boolean> handleResponse(HttpResponse httpResponse, JsonConverter jsonConverter) throws IOException { int status = httpResponse.getStatusLine().getStatusCode(); if (status == HttpStatus.SC_OK) { LOG.info("Expected HttpResponse statusCode: {}", HttpStatus.SC_OK); return jsonConverter.convert(getJsonObject(httpResponse)); } else { throw new ClientProtocolException("Unexpected response status: " + status + ", reason: " + httpResponse.getStatusLine().getReasonPhrase()); } } @VisibleForTesting protected HttpResponse post(String url, Map<String, String> payloads) throws IOException { try { HttpPost postRequest = new HttpPost(url); postRequest.setHeader("Accept", ACCEPT_CONTENT_TYPE); StringEntity entity = new StringEntity(OBJECT_MAPPER.writeValueAsString(payloads), ContentType.APPLICATION_JSON); postRequest.setEntity(entity); LOG.info("Executing request: {}, headers: {}, entity: {}", postRequest.getRequestLine(), postRequest.getAllHeaders(), postRequest.getEntity()); return _httpClient.execute(postRequest); } catch (IOException e) { LOG.error("Failed to perform customized health check. Is participant endpoint {} available?", url, e); throw e; } } }