Apollo 应用与源码分析：CyberRT-组件（component）

目录

概念

二进制与组件

基本的使用方法

使用组件的优势

Dag文件

样例

参数含义

样例

Common_component_example

Timer_component_example

构建与运行

注意

Apollo Guardian 样例分析

guardian_component.h

guardian_component.cc

dag

build

launch

---

概念

组件是cyberrt提供的用于构建应用程序模块的基类。

每个特定的应用程序模块都可以继承Component类，并定义自己的Init和Proc函数，以便将其加载到Cyber框架中。

二进制与组件

将Cyber RT框架用于应用程序有两个选项：

• 基于二进制文件：应用程序单独编译成二进制文件，通过创建自己的Reader和Writer与其他网络模块通信。
• 基于组件：应用程序被编译成共享库。通过继承component类并编写相应的dag描述文件，Cyber RT框架将动态加载和运行应用程序。

基本的使用方法

主要是需要继承component类，然后重写两个函数： init和proc

• 组件的Init()函数类似于对算法进行一些初始化的主要函数。
• 组件的Proc()函数的工作原理类似于框架在消息到达时调用的Reader回调函数。

使用组件的优势

• 组件可以通过启动文件加载到不同的进程中，并且部署是灵活的。
• 组件可以通过修改dag文件而不重新编译来更改收到的通道名称。
• 组件支持接收多种类型的数据。
• 组件支持提供多种融合策略。

Dag文件

样例

# Define all coms in DAG streaming.
module_config {
    module_library : "lib/libperception_component.so"
    components {
        class_name : "PerceptionComponent"
        config {
            name : "perception"
            readers {
                channel: "perception/channel_name"
            }
        }
    }
    timer_components {
        class_name : "DriverComponent"
        config {
            name : "driver"
            interval : 100
        }
    }
}

参数含义

• module_library：如果您想加载.so库，根目录是网络的工作目录（setup.bash的同一目录）
• components & timer_component：选择需要加载的基本组件类类型。
• class_name：要加载的组件类的名称
• name：加载的class_name作为加载示例的标识符
• readers：当前组件收到的数据，支持1-3个数据通道。

样例

Common_component_example

#include 

#include "cyber/class_loader/class_loader.h"
#include "cyber/component/component.h"
#include "cyber/examples/proto/examples.pb.h"

using apollo::cyber::examples::proto::Driver;
using apollo::cyber::Component;
using apollo::cyber::ComponentBase;

class Commontestcomponent : public Component {
 public:
  bool Init() override;
  bool Proc(const std::shared_ptr& msg0,
            const std::shared_ptr& msg1) override;
};
CYBER_REGISTER_COMPONENT(Commontestcomponent)  // 注册到反射框架中

#include "cyber/examples/common_component_smaple/common_component_example.h"

#include "cyber/class_loader/class_loader.h"
#include "cyber/component/component.h"

bool Commontestcomponent::Init() {
  AINFO << "Commontest component init";
  return true;
}

bool Commontestcomponent::Proc(const std::shared_ptr& msg0,
                               const std::shared_ptr& msg1) {
  AINFO << "Start commontest component Proc [" << msg0->msg_id() << "] ["
        << msg1->msg_id() << "]";
  return true;
} 

Timer_component_example

#include 

#include "cyber/class_loader/class_loader.h"
#include "cyber/component/component.h"
#include "cyber/component/timer_component.h"
#include "cyber/examples/proto/examples.pb.h"

using apollo::cyber::examples::proto::Driver;
using apollo::cyber::Component;
using apollo::cyber::ComponentBase;
using apollo::cyber::TimerComponent;
using apollo::cyber::Writer;

class TimertestComponent : public TimerComponent {
 public:
  bool Init() override;
  bool Proc() override;

 private:
  std::shared_ptr> driver_writer_ = nullptr;
};
CYBER_REGISTER_COMPONENT(TimertestComponent)

#include "cyber/examples/timer_component_example/timer_component_example.h"

#include "cyber/class_loader/class_loader.h"
#include "cyber/component/component.h"
#include "cyber/examples/proto/examples.pb.h"

bool TimertestComponent::Init() {
  driver_writer_ = node_->CreateWriter("/carstatus/channel");
  return true;
}

bool TimertestComponent::Proc() {
  static int i = 0;
  auto out_msg = std::make_shared();
  out_msg->set_msg_id(i++);
  driver_writer_->Write(out_msg);
  AINFO << "timertestcomponent: Write drivermsg->"
        << out_msg->ShortDebugString();
  return true;
}

构建与运行

• Build: bazel build cyber/examples/timer_component_smaple/…
• Run: mainboard -d cyber/examples/timer_component_smaple/timer.dag

注意

• 需要注册组件才能通过SharedLibrary加载类。注册界面如下所示：

CYBER_REGISTER_COMPONENT(DriverComponent) 

如果您在注册时使用命名空间，则在dag文件中定义命名空间时，您还需要添加命名空间。

• Component和TimerComponent的配置不同，请注意不要将两者混淆。

Apollo Guardian 样例分析

guardian 相对比较简单，可以用于分析component的使用

guardian_component.h

/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed 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.
 *****************************************************************************/

/**
 * @file
 */

#pragma once

#include 

#include "cyber/common/macros.h"
#include "cyber/component/timer_component.h"
#include "cyber/cyber.h"

#include "modules/canbus/proto/chassis.pb.h"
#include "modules/control/proto/control_cmd.pb.h"
#include "modules/guardian/proto/guardian.pb.h"
#include "modules/guardian/proto/guardian_conf.pb.h"
#include "modules/monitor/proto/system_status.pb.h"

/**
 * @namespace apollo::guardian
 * @brief apollo::guardian
 */
namespace apollo {
namespace guardian {

class GuardianComponent : public apollo::cyber::TimerComponent {
 public:
  bool Init() override;
  bool Proc() override;

 private:
  void PassThroughControlCommand();
  void TriggerSafetyMode();

  apollo::guardian::GuardianConf guardian_conf_;
  apollo::canbus::Chassis chassis_;
  apollo::monitor::SystemStatus system_status_;
  apollo::control::ControlCommand control_cmd_;
  apollo::guardian::GuardianCommand guardian_cmd_;

  double last_status_received_s_{};

  std::shared_ptr>
      chassis_reader_;
  std::shared_ptr>
      control_cmd_reader_;
  std::shared_ptr>
      system_status_reader_;
  std::shared_ptr>
      guardian_writer_;

  std::mutex mutex_;
};

CYBER_REGISTER_COMPONENT(GuardianComponent)

}  // namespace guardian
}  // namespace apollo

guardian_component.cc

/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed 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.
 *****************************************************************************/
#include "modules/guardian/guardian_component.h"

#include "cyber/common/log.h"
#include "modules/common/adapters/adapter_gflags.h"
#include "modules/common/util/message_util.h"

using Time = ::apollo::cyber::Time;

namespace apollo {
namespace guardian {

using apollo::canbus::Chassis;
using apollo::control::ControlCommand;
using apollo::monitor::SystemStatus;

bool GuardianComponent::Init() {
  if (!GetProtoConfig(&guardian_conf_)) {
    AERROR << "Unable to load canbus conf file: " << ConfigFilePath();
    return false;
  }

  chassis_reader_ = node_->CreateReader(
      FLAGS_chassis_topic, [this](const std::shared_ptr& chassis) {
        ADEBUG << "Received chassis data: run chassis callback.";
        std::lock_guard lock(mutex_);
        chassis_.CopyFrom(*chassis);
      });

  control_cmd_reader_ = node_->CreateReader(
      FLAGS_control_command_topic,
      [this](const std::shared_ptr& cmd) {
        ADEBUG << "Received control data: run control callback.";
        std::lock_guard lock(mutex_);
        control_cmd_.CopyFrom(*cmd);
      });

  system_status_reader_ = node_->CreateReader(
      FLAGS_system_status_topic,
      [this](const std::shared_ptr& status) {
        ADEBUG << "Received system status data: run system status callback.";
        std::lock_guard lock(mutex_);
        last_status_received_s_ = Time::Now().ToSecond();
        system_status_.CopyFrom(*status);
      });

  guardian_writer_ = node_->CreateWriter(FLAGS_guardian_topic);

  return true;
}

bool GuardianComponent::Proc() {
  constexpr double kSecondsTillTimeout(2.5);

  bool safety_mode_triggered = false;
  if (guardian_conf_.guardian_enable()) {
    std::lock_guard lock(mutex_);
    if (Time::Now().ToSecond() - last_status_received_s_ >
        kSecondsTillTimeout) {
      safety_mode_triggered = true;
    }
    safety_mode_triggered =
        safety_mode_triggered || system_status_.has_safety_mode_trigger_time();
  }

  if (safety_mode_triggered) {
    ADEBUG << "Safety mode triggered, enable safety mode";
    TriggerSafetyMode();
  } else {
    ADEBUG << "Safety mode not triggered, bypass control command";
    PassThroughControlCommand();
  }

  common::util::FillHeader(node_->Name(), &guardian_cmd_);
  guardian_writer_->Write(guardian_cmd_);
  return true;
}

void GuardianComponent::PassThroughControlCommand() {
  std::lock_guard lock(mutex_);
  guardian_cmd_.mutable_control_command()->CopyFrom(control_cmd_);
}

void GuardianComponent::TriggerSafetyMode() {
  AINFO << "Safety state triggered, with system safety mode trigger time : "
        << system_status_.safety_mode_trigger_time();
  std::lock_guard lock(mutex_);
  bool sensor_malfunction = false, obstacle_detected = false;
  if (!chassis_.surround().sonar_enabled() ||
      chassis_.surround().sonar_fault()) {
    AINFO << "Ultrasonic sensor not enabled for faulted, will do emergency "
             "stop!";
    sensor_malfunction = true;
  } else {
    // TODO(QiL) : Load for config
    for (int i = 0; i < chassis_.surround().sonar_range_size(); ++i) {
      if ((chassis_.surround().sonar_range(i) > 0.0 &&
           chassis_.surround().sonar_range(i) < 2.5) ||
          chassis_.surround().sonar_range(i) > 30) {
        AINFO << "Object detected or ultrasonic sensor fault output, will do "
                 "emergency stop!";
        obstacle_detected = true;
      }
    }
  }

  guardian_cmd_.mutable_control_command()->set_throttle(0.0);
  guardian_cmd_.mutable_control_command()->set_steering_target(0.0);
  guardian_cmd_.mutable_control_command()->set_steering_rate(25.0);
  guardian_cmd_.mutable_control_command()->set_is_in_safe_mode(true);

  // TODO(QiL) : Remove this one once hardware re-alignment is done.
  sensor_malfunction = false;
  obstacle_detected = false;
  AINFO << "Temporarily ignore the ultrasonic sensor output during hardware "
           "re-alignment!";

  if (system_status_.require_emergency_stop() || sensor_malfunction ||
      obstacle_detected) {
    AINFO << "Emergency stop triggered! with system status from monitor as : "
          << system_status_.require_emergency_stop();
    guardian_cmd_.mutable_control_command()->set_brake(
        guardian_conf_.guardian_cmd_emergency_stop_percentage());
  } else {
    AINFO << "Soft stop triggered! with system status from monitor as : "
          << system_status_.require_emergency_stop();
    guardian_cmd_.mutable_control_command()->set_brake(
        guardian_conf_.guardian_cmd_soft_stop_percentage());
  }
}

}  // namespace guardian
}  // namespace apollo

dag

module_config {
    module_library : "/apollo/bazel-bin/modules/guardian/libguardian_component.so",
    timer_components {
        class_name : "GuardianComponent"
        config {
            name: "guardian"
            config_file_path: "/apollo/modules/guardian/conf/guardian_conf.pb.txt"
            interval: 10
        }
    }
}

build

load("@rules_cc//cc:defs.bzl", "cc_binary", "cc_library")
load("//tools/install:install.bzl", "install")
load("//tools:cpplint.bzl", "cpplint")

package(default_visibility = ["//visibility:public"])

GUARDIAN_COPTS = ['-DMODULE_NAME=\\"guardian\\"']

cc_library(
    name = "guardian_component_lib",
    srcs = ["guardian_component.cc"],
    hdrs = ["guardian_component.h"],
    copts = GUARDIAN_COPTS,
    deps = [
        "//cyber",
        "//modules/canbus/proto:chassis_cc_proto",
        "//modules/common/adapters:adapter_gflags",
        "//modules/common/util:message_util",
        "//modules/control/proto:control_cmd_cc_proto",
        "//modules/guardian/proto:guardian_cc_proto",
        "//modules/guardian/proto:guardian_conf_cc_proto",
        "//modules/monitor/proto:system_status_cc_proto",
    ],
)

cc_binary(
    name = "libguardian_component.so",
    linkshared = True,
    linkstatic = False,
    deps = [
        ":guardian_component_lib",
    ],
)

install(
    name = "install",
    data = [
        ":runtime_data",
    ],
    targets = [
        ":libguardian_component.so",
    ],
    deps = [
        "//cyber:install",
    ],
)

filegroup(
    name = "runtime_data",
    srcs = glob([
        "conf/*.txt",
        "dag/*.dag",
        "launch/*.launch",
    ]),
)

cpplint()

launch

    
        guardian
        /apollo/modules/guardian/dag/guardian.dag
        guardian