| /* |
| * 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.bookkeeper.server.http.service; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static java.nio.charset.StandardCharsets.US_ASCII; |
| |
| import com.google.common.collect.Maps; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import org.apache.bookkeeper.client.BookKeeperAdmin; |
| import org.apache.bookkeeper.client.LedgerEntry; |
| import org.apache.bookkeeper.common.util.JsonUtil; |
| import org.apache.bookkeeper.conf.ServerConfiguration; |
| import org.apache.bookkeeper.http.HttpServer; |
| import org.apache.bookkeeper.http.service.HttpEndpointService; |
| import org.apache.bookkeeper.http.service.HttpServiceRequest; |
| import org.apache.bookkeeper.http.service.HttpServiceResponse; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * HttpEndpointService that handle Bookkeeper read ledger entry related http request. |
| * |
| * <p>The GET method will print all entry content of wanted entry. |
| * User should set wanted "ledger_id", and can choose only print out wanted entry |
| * by set parameter "start_entry_id", "end_entry_id" and "page". |
| */ |
| public class ReadLedgerEntryService implements HttpEndpointService { |
| |
| static final Logger LOG = LoggerFactory.getLogger(ReadLedgerEntryService.class); |
| |
| protected ServerConfiguration conf; |
| protected BookKeeperAdmin bka; |
| |
| public ReadLedgerEntryService(ServerConfiguration conf, BookKeeperAdmin bka) { |
| checkNotNull(conf); |
| this.conf = conf; |
| this.bka = bka; |
| } |
| |
| static final Long ENTRIES_PER_PAE = 1000L; |
| |
| @Override |
| public HttpServiceResponse handle(HttpServiceRequest request) throws Exception { |
| HttpServiceResponse response = new HttpServiceResponse(); |
| Map<String, String> params = request.getParams(); |
| |
| if (HttpServer.Method.GET == request.getMethod() && (params != null) && params.containsKey("ledger_id")) { |
| Long ledgerId = Long.parseLong(params.get("ledger_id")); |
| Long startEntryId = 0L; |
| Long endEntryId = -1L; |
| if (params.containsKey("start_entry_id")) { |
| startEntryId = Long.parseLong(params.get("start_entry_id")); |
| } |
| if (params.containsKey("end_entry_id")) { |
| endEntryId = Long.parseLong(params.get("end_entry_id")); |
| } |
| |
| // output <entryid: entry_content> |
| Map<String, String> output = Maps.newHashMap(); |
| |
| // Page index should start from 1; |
| Integer pageIndex = params.containsKey("page") ? Integer.parseInt(params.get("page")) : -1; |
| if (pageIndex > 0) { |
| // start and end ledger index for wanted page. |
| Long startIndexInPage = (pageIndex - 1) * ENTRIES_PER_PAE; |
| Long endIndexInPage = startIndexInPage + ENTRIES_PER_PAE - 1; |
| |
| if ((startEntryId == 0L) || (startEntryId < startIndexInPage)) { |
| startEntryId = startIndexInPage; |
| } |
| if ((endEntryId == -1L) || (endEntryId > endIndexInPage)) { |
| endEntryId = endIndexInPage; |
| } |
| output.put("Entries for page: ", pageIndex.toString()); |
| } |
| |
| if (endEntryId != -1L && startEntryId > endEntryId) { |
| response.setCode(HttpServer.StatusCode.INTERNAL_ERROR); |
| response.setBody("parameter for start_entry_id: " + startEntryId |
| + " and end_entry_id: " + endEntryId + " conflict with page=" + pageIndex); |
| return response; |
| } |
| |
| Iterator<LedgerEntry> entries = bka.readEntries(ledgerId, startEntryId, endEntryId).iterator(); |
| while (entries.hasNext()) { |
| LedgerEntry entry = entries.next(); |
| output.put(Long.valueOf(entry.getEntryId()).toString(), new String(entry.getEntry(), US_ASCII)); |
| } |
| |
| String jsonResponse = JsonUtil.toJson(output); |
| LOG.debug("output body:" + jsonResponse); |
| response.setBody(jsonResponse); |
| response.setCode(HttpServer.StatusCode.OK); |
| return response; |
| } else { |
| response.setCode(HttpServer.StatusCode.NOT_FOUND); |
| response.setBody("Not found method. Should be GET method, with ledger_id provided"); |
| return response; |
| } |
| } |
| } |