content: /*
   * 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.camel.karavan.api;
  
  import io.fabric8.kubernetes.client.KubernetesClient;
  import io.fabric8.kubernetes.client.dsl.LogWatch;
  import io.smallrye.context.api.ManagedExecutorConfig;
  import io.smallrye.context.api.NamedInstance;
  import io.smallrye.mutiny.tuples.Tuple2;
  import jakarta.inject.Inject;
  import jakarta.ws.rs.GET;
  import jakarta.ws.rs.Path;
  import jakarta.ws.rs.PathParam;
  import jakarta.ws.rs.Produces;
  import jakarta.ws.rs.core.Context;
  import jakarta.ws.rs.core.MediaType;
  import jakarta.ws.rs.sse.Sse;
  import jakarta.ws.rs.sse.SseEventSink;
  import org.apache.camel.karavan.docker.DockerLogCallback;
  import org.apache.camel.karavan.docker.DockerService;
  import org.apache.camel.karavan.kubernetes.KubernetesService;
  import org.apache.camel.karavan.service.ConfigService;
  import org.apache.camel.karavan.service.NotificationService;
  import org.eclipse.microprofile.context.ManagedExecutor;
  import org.jboss.logging.Logger;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.util.concurrent.ConcurrentHashMap;
  
  @Path("/ui/logwatch")
  public class LogWatchResource {
  
      private static final Logger LOGGER = Logger.getLogger(LogWatchResource.class.getName());
      private static final String SERVICE_NAME = "LOGWATCH";
      private static final ConcurrentHashMap<String, Tuple2<LogWatch, KubernetesClient>> logWatches = new ConcurrentHashMap<>();
  
      @Inject
      KubernetesService kubernetesService;
  
      @Inject
      DockerService dockerService;
  
      @Inject
      NotificationService notificationService;
  
      @Inject
      @ManagedExecutorConfig()
      @NamedInstance("logExecutor")
      ManagedExecutor managedExecutor;
  
      @GET
      @Produces(MediaType.SERVER_SENT_EVENTS)
      @Path("/{type}/{name}/{username}")
      public void eventSourcing(@PathParam("type") String type,
                                @PathParam("name") String name,
                                @PathParam("username") String username,
                                @Context SseEventSink eventSink,
                                @Context Sse sse) {
          notificationService.sinkCleanup(SERVICE_NAME + ":" + type + ":" + name, username, eventSink);
          managedExecutor.execute(() -> {
              LOGGER.info("LogWatch for " + name + " starting... ");
              if (ConfigService.inKubernetes()) {
                  getKubernetesLogs(name, username, eventSink, sse);
              } else {
                  getDockerLogs(type, name, eventSink, sse);
              }
          });
      }
  
      private void getDockerLogs(String type, String name, SseEventSink eventSink, Sse sse) {
          LOGGER.info("LogCallback for " + name + " starting");
          try (SseEventSink sink = eventSink) {
              DockerLogCallback dockerLogCallback = new DockerLogCallback(line -> {
                  if (!sink.isClosed()) {
                      sink.send(sse.newEvent(line));
                  }
              });
              dockerService.logContainer(name, dockerLogCallback);
              dockerLogCallback.close();
              sink.close();
              LOGGER.info("LogCallback for " + name + " closed");
          } catch (Exception e) {
              LOGGER.error(e.getMessage());
          }
      }
  
      private void getKubernetesLogs(String name, String username, SseEventSink eventSink, Sse sse) {
          try (SseEventSink sink = eventSink) {
              Tuple2<LogWatch, KubernetesClient> request = kubernetesService.getContainerLogWatch(name);
              logWatchCleanup(SERVICE_NAME, username, request);
              LogWatch logWatch = request.getItem1();
              BufferedReader reader = new BufferedReader(new InputStreamReader(logWatch.getOutput()));
              try {
                  for (String line; (line = reader.readLine()) != null && !sink.isClosed(); ) {
                      sink.send(sse.newEvent(line));
                  }
              } catch (IOException e) {
                  LOGGER.error(e.getMessage());
              }
              logWatch.close();
              request.getItem2().close();
              sink.close();
              LOGGER.info("LogWatch for " + name + " closed");
          }
      }
  
      protected void logWatchCleanup(String service, String username, Tuple2<LogWatch, KubernetesClient> logWatch) {
          String key = service + ":" + username;
          if (logWatches.containsKey(key)) {
              var lw = logWatches.get(key);
              try {
                  lw.getItem1().close();
                  lw.getItem2().close();
              } catch (Exception e) {
                  LOGGER.error(e.getMessage());
              }
          }
          logWatches.put(key, logWatch);
      }
  }