src/kudu/tools/tool_action_tserver.cc

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// 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
//
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#include "kudu/tools/tool_action.h"

#include <memory>
#include <string>
#include <utility>

#include <gflags/gflags.h>

#include "kudu/gutil/map-util.h"
#include "kudu/tools/tool_action_common.h"
#include "kudu/tserver/tablet_server.h"
#include "kudu/util/status.h"

namespace kudu {
namespace tools {

using std::string;
using std::unique_ptr;

namespace {

const char* const kTServerAddressArg = "tserver_address";
const char* const kTServerAddressDesc = "Address of a Kudu Tablet Server of "
    "form 'hostname:port'. Port may be omitted if the Tablet Server is bound "
    "to the default port.";
const char* const kFlagArg = "flag";
const char* const kValueArg = "value";

Status TServerSetFlag(const RunnerContext& context) {
  const string& address = FindOrDie(context.required_args, kTServerAddressArg);
  const string& flag = FindOrDie(context.required_args, kFlagArg);
  const string& value = FindOrDie(context.required_args, kValueArg);
  return SetServerFlag(address, tserver::TabletServer::kDefaultPort,
                       flag, value);
}

Status TServerStatus(const RunnerContext& context) {
  const string& address = FindOrDie(context.required_args, kTServerAddressArg);
  return PrintServerStatus(address, tserver::TabletServer::kDefaultPort);
}

Status TServerTimestamp(const RunnerContext& context) {
  const string& address = FindOrDie(context.required_args, kTServerAddressArg);
  return PrintServerTimestamp(address, tserver::TabletServer::kDefaultPort);
}

} // anonymous namespace

unique_ptr<Mode> BuildTServerMode() {
  unique_ptr<Action> set_flag =
      ActionBuilder("set_flag", &TServerSetFlag)
      .Description("Change a gflag value on a Kudu Tablet Server")
      .AddRequiredParameter({ kTServerAddressArg, kTServerAddressDesc })
      .AddRequiredParameter({ kFlagArg, "Name of the gflag" })
      .AddRequiredParameter({ kValueArg, "New value for the gflag" })
      .AddOptionalParameter("force")
      .Build();

  unique_ptr<Action> status =
      ActionBuilder("status", &TServerStatus)
      .Description("Get the status of a Kudu Tablet Server")
      .AddRequiredParameter({ kTServerAddressArg, kTServerAddressDesc })
      .Build();

  unique_ptr<Action> timestamp =
      ActionBuilder("timestamp", &TServerTimestamp)
      .Description("Get the current timestamp of a Kudu Tablet Server")
      .AddRequiredParameter({ kTServerAddressArg, kTServerAddressDesc })
      .Build();

  return ModeBuilder("tserver")
      .Description("Operate on a Kudu Tablet Server")
      .AddAction(std::move(set_flag))
      .AddAction(std::move(status))
      .AddAction(std::move(timestamp))
      .Build();
}

} // namespace tools
} // namespace kudu