[GitHub] cassandra pull request #190: [CASSANDRA-13665] Add client list nodetool comm...

[mhartopo <gi...@git.apache.org>]

Github user mhartopo commented on a diff in the pull request:

    https://github.com/apache/cassandra/pull/190#discussion_r178269292
  
    --- Diff: src/java/org/apache/cassandra/tools/nodetool/ClientStats.java ---
    @@ -0,0 +1,69 @@
    +/*
    + * 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.cassandra.tools.nodetool;
    +
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Map.Entry;
    +
    +import org.apache.cassandra.tools.NodeProbe;
    +import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
    +import org.apache.cassandra.tools.nodetool.formatter.TableBuilder;
    +
    +import io.airlift.airline.Command;
    +import io.airlift.airline.Option;
    +
    +@Command(name = "clientstats", description = "Print information about connected clients")
    +public class ClientStats extends NodeToolCmd
    +{
    +    @Option(title = "list_connections", name = "--all", description = "Lists all connections")
    +    private boolean listConnections = false;
    +
    +    @Override
    +    public void execute(NodeProbe probe)
    +    {
    +        if (listConnections)
    +        {
    +            List<Map<String, String>> clients = (List<Map<String, String>>) probe.getClientMetric("connections");
    +            if (!clients.isEmpty())
    +            {
    +                TableBuilder table = new TableBuilder();
    +                table.add("Address", "SSL", "Version", "User", "Keyspace", "Requests");
    +                for (Map<String, String> conn : clients)
    +                {
    +                    table.add(conn.get("address"), conn.get("ssl"), conn.get("version"), 
    +                              conn.get("user"), conn.get("keyspace"), conn.get("requests"));
    +                }
    +                table.printTo(System.out);
    +                System.out.println();
    +            }
    +        }
    +
    +        Map<String, Integer> connectionsByUser = (Map<String, Integer>) probe.getClientMetric("connectedNativeClientsByUser");
    +        int total = connectionsByUser.values().stream().reduce(0, Integer::sum);
    +        System.out.println("Total connected clients: " + total);
    +        System.out.println();
    +        TableBuilder table = new TableBuilder();
    +        table.add("User", "Connections");
    +        for (Entry<String, Integer> entry : connectionsByUser.entrySet())
    +        {
    +            table.add(entry.getKey(), entry.getValue().toString());
    +        }
    +        table.printTo(System.out);
    +    }
    +}
    --- End diff --
    
    don't forget newline at the EOF


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