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  • ROS行为树实现（Python）——模板应用

    一、场景设计

    　　场景设计如下，一个线程每隔10s生成一个MoveBaseGoal并加入队列，子树Path依次取出MoveBaseGoal并发送给MoveBaseServer完成全部路径，需要实现的内容如下：

    　　1、一个生成MoveBaseGoal的线程；

    　　2、子树Path；

    　　3、为了方便测试，需要一个模拟的MoveBaseServer；

    二、程序实现

    　　1、生成MoveBaseGoal：GenGoal.py

     1 #!/usr/bin/env python
 2 
 3 
 4 import threading
 5 import time
 6 
 7 from move_base_msgs.msg import *
 8 
 9 
10 _goal_list = []
11 _gen_goal_thread = None
12 
13 
14 def get_goal():
15     if len(_goal_list)>0:
16         return True, _goal_list.pop(0)
17     return False, None
18 
19 
20 def gen_goal():
21     global _gen_goal_thread
22     _gen_goal_thread = threading.Thread(target=_gen_goal, name="GenGoal")
23     _gen_goal_thread.setDaemon(True)
24     _gen_goal_thread.start()
25     return
26 
27 
28 def _gen_goal():
29     x, y = 0, 0
30     for i in range(1, 20):
31         x, y = x+i, y+i
32         goal = MoveBaseGoal()
33         goal.target_pose.pose.position.x, goal.target_pose.pose.position.y = x, y
34         _goal_list.append(goal)
35         time.sleep(10)
36     return
37 
38 
39 if __name__ == "__main__":
40     gen_goal()
41     while True:
42         flag, goal = get_goal()
43         if flag:
44             print(goal)
45         time.sleep(5)
    View Code

    　　为避免无休止地生成MoveBaseGoal，此处以20为上限。

    　　2、子树Path：

    　　　　1）visio视图：

    　　　　2）代码

    　　　　　　生成子树Path基本框架，命令如下：

    $ cd <path_to_templates>
$ python SubTree_Temlate_Generator.py Path

    　　　　　　生成文件SubTree_Path.py和SubTree_Path_Test.py，存放于templates/SubTree_Gen/目录，修改SubTree_Path.py如下：

      1 #!/usr/bin/env python
  2 
  3 
  4 _prefix = "Path"
  5 
  6 
  7 import rospy
  8 from move_base_msgs.msg import *
  9 
 10 from bt_tree_lib.bt_tree_ros import *
 11 from GenGoal import *
 12 
 13 
 14 Path_SubTree_Dict = {}
 15 
 16 
 17 class Path_SubTreeParamStatus(object):
 18     PREPARING = 0
 19     EXECUTING = 1
 20 
 21 
 22 class Path_SubTreeParam(object):
 23     def __init__(self, *args, **kwargs):
 24         super(Path_SubTreeParam, self).__init__(*args, **kwargs)
 25         self.status = Path_SubTreeParamStatus.PREPARING
 26 
 27         self.goal = MoveBaseGoal()
 28         return
 29 
 30     def get_status(self):
 31         return self.status
 32 
 33     def set_status(self, status):
 34         self.status = status
 35         return
 36 
 37     def reset(self):
 38         self.status = Path_SubTreeParamStatus.PREPARING
 39 
 40         self.__set_goal(self.goal, MoveBaseGoal())
 41         return
 42 
 43     def set(self, param):
 44         self.__set_goal(self.goal, param)
 45         return
 46 
 47     def __set_goal(self, goal, param):
 48         goal.target_pose = param.target_pose
 49         return
 50 
 51 
 52 def Path_init():
 53     gen_goal()
 54     return
 55 
 56 
 57 def Path_cancel():
 58     for key, value in Path_SubTree_Dict.items():
 59         value['SubTreeParam'].reset()
 60         value['SubTree'].reset()
 61     return
 62 
 63 
 64 def Path_get_SubTree(name):
 65     # Input check.
 66     if not isinstance(name, str):
 67         return False, None, None, "Parameter passed is not a string."
 68     if Path_SubTree_Dict.has_key(name):
 69         return False, None, None, "The Path_SubTree %s has already existed." % name
 70     
 71     SubTreeParam = Path_SubTreeParam()
 72     SubTree = _Path_get_SubTree(SubTreeParam)
 73     
 74     # Save the SubTree, and return result.
 75     Path_SubTree_Dict[name] = {'SubTreeParam': SubTreeParam, 'SubTree': SubTree}
 76     return True, SubTreeParam, SubTree, ""
 77 
 78 
 79 def _Path_get_SubTree(param):
 80     HAS_PATH_EXECUTING = PathNode_has_Path_EXECUTING("HAS_PATH_EXECUTING", param)
 81     GET_A_NEW_GOAL = Get_A_New_Goal("GET_A_NEW_GOAL", param)
 82     PATH_LOOP_HEADER = Selector("PATH_LOOP_HEADER", [HAS_PATH_EXECUTING, GET_A_NEW_GOAL])
 83     PATH_LOOP_HEADER_WRAPPER = DecoratorNode_NOT("PATH_LOOP_HEADER_WRAPPER", PATH_LOOP_HEADER)
 84 
 85     SET_PATH_EXECUTING = PathNode_set_Path_EXECUTING("SET_PATH_EXECUTING", param)
 86     NAVIGATE = SimpleActionNode("NAVIGATE", "move_base", MoveBaseAction, param.goal, 10)
 87     SET_PATH_PREPARING = PathNode_set_Path_PREPARING("SET_PATH_PREPARING", param)
 88     PATH_LOOP_BODY = Sequence_withMemory("PATH_LOOP_BODY", [SET_PATH_EXECUTING, NAVIGATE, SET_PATH_PREPARING])
 89 
 90 
 91     return Selector("PATH_LOOP", [PATH_LOOP_HEADER_WRAPPER, PATH_LOOP_BODY])
 92 
 93 
 94 class PathNode_has_Path_EXECUTING(LeafNode):
 95     def __init__(self, name, param, *args, **kwargs):
 96         super(PathNode_has_Path_EXECUTING, self).__init__(name, *args, **kwargs)
 97         self.param = param
 98         return
 99 
100     def run(self):
101         status = self.param.get_status()
102         if status == Path_SubTreeParamStatus.EXECUTING:
103             return NodeStatus.SUCCESS
104         return NodeStatus.FAILURE
105 
106 
107 class PathNode_set_Path_EXECUTING(LeafNode):
108     def __init__(self, name, param, *args, **kwargs):
109         super(PathNode_set_Path_EXECUTING, self).__init__(name, *args, **kwargs)
110         self.param = param
111         return
112 
113     def run(self):
114         self.param.set_status(Path_SubTreeParamStatus.EXECUTING)
115         return NodeStatus.SUCCESS
116 
117 
118 class PathNode_set_Path_PREPARING(LeafNode):
119     def __init__(self, name, param, *args, **kwargs):
120         super(PathNode_set_Path_PREPARING, self).__init__(name, *args, **kwargs)
121         self.param = param
122         return
123 
124     def run(self):
125         self.param.set_status(Path_SubTreeParamStatus.PREPARING)
126         return NodeStatus.SUCCESS
127 
128 
129 class Get_A_New_Goal(LeafNode):
130     def __init__(self, name, param, *args, **kwargs):
131         super(Get_A_New_Goal, self).__init__(name, *args, **kwargs)
132         self.param = param
133         return
134 
135     def run(self):
136         flag, goal = get_goal()
137         if flag:
138             self.param.set(goal)
139             return NodeStatus.SUCCESS
140         return NodeStatus.FAILURE
    View Code

    　　3、模拟MoveBaseServer：SimServer.py

     1 #!/usr/bin/env python
 2 
 3 
 4 import math
 5 import time
 6 
 7 import rospy
 8 import actionlib
 9 from move_base_msgs.msg import *
10 
11 
12 class SimServer(object):
13     def __init__(self, *args, **kwargs):
14         super(SimServer, self).__init__(*args, **kwargs)
15         self.position = {'x': 0, 'y': 0}
16 
17         self.server = actionlib.SimpleActionServer("move_base", MoveBaseAction, self.execute, False)
18         self.server.start()
19         return
20 
21     def execute(self, goal):
22         rospy.loginfo("%s accept." % str(self.server.current_goal))
23         rospy.loginfo("%s" % str(goal))
24 
25         position, orientation = goal.target_pose.pose.position, goal.target_pose.pose.orientation
26         position = {'x': position.x, 'y': position.y}
27         
28         count = int(math.sqrt((position['x']-self.position['x'])**2 + (position['y']-self.position['y'])**2)) + 1
29         
30         self.position.update(position)
31 
32         for index in range(0, count):
33             if self.server.is_preempt_requested():
34                 rospy.loginfo("%s preempt occurred." % str(self.server.current_goal))
35                 self.server.set_preempted()
36                 return
37             time.sleep(1)
38         self.server.set_succeeded()
39         return
40 
41 
42 if __name__ == "__main__":
43     rospy.init_node("sim_server")
44     server = SimServer()
45     rospy.spin()
    View Code

     三、测试

    　　测试命令如下：

    $ rosrun bt_tree SimServer.py
$ rosrun bt_tree SubTree_Path_Test.py

    　　输出记录如下：

    [INFO] [1541560447.702743]: NAVIGATE connected to move_base.
[INFO] [1541560447.703035]: NAVIGATE sending goal...
[INFO] [1541560447.703393]: RUNNING
[INFO] [1541560448.704274]: RUNNING
[INFO] [1541560449.705932]: RUNNING
[INFO] [1541560449.737800]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560450.707340]: SUCCESS
[INFO] [1541560451.708958]: SUCCESS
[INFO] [1541560452.709779]: SUCCESS
[INFO] [1541560453.710609]: SUCCESS
[INFO] [1541560454.711420]: SUCCESS
[INFO] [1541560455.712190]: SUCCESS
[INFO] [1541560456.713061]: SUCCESS
[INFO] [1541560457.714181]: NAVIGATE sending goal...
[INFO] [1541560457.715852]: RUNNING
[INFO] [1541560458.717042]: RUNNING
[INFO] [1541560459.718073]: RUNNING
[INFO] [1541560460.718957]: RUNNING
[INFO] [1541560460.725067]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560461.719963]: SUCCESS
[INFO] [1541560462.720858]: SUCCESS
[INFO] [1541560463.721659]: SUCCESS
[INFO] [1541560464.722459]: SUCCESS
[INFO] [1541560465.723285]: SUCCESS
[INFO] [1541560466.724095]: SUCCESS
[INFO] [1541560467.724926]: NAVIGATE sending goal...
[INFO] [1541560467.725485]: RUNNING
[INFO] [1541560468.726893]: RUNNING
[INFO] [1541560469.727682]: RUNNING
[INFO] [1541560470.728476]: RUNNING
[INFO] [1541560471.729293]: RUNNING
[INFO] [1541560472.730082]: RUNNING
[INFO] [1541560472.746182]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560473.731095]: SUCCESS
[INFO] [1541560474.731949]: SUCCESS
[INFO] [1541560475.732760]: SUCCESS
[INFO] [1541560476.733493]: SUCCESS
[INFO] [1541560477.734197]: NAVIGATE sending goal...
[INFO] [1541560477.734792]: RUNNING
[INFO] [1541560478.735802]: RUNNING
[INFO] [1541560479.736804]: RUNNING
[INFO] [1541560480.737945]: RUNNING
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[INFO] [1541560482.739576]: RUNNING
[INFO] [1541560483.740307]: RUNNING
[INFO] [1541560483.766805]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560484.741266]: SUCCESS
[INFO] [1541560485.742125]: SUCCESS
[INFO] [1541560486.742954]: SUCCESS
[INFO] [1541560487.743846]: NAVIGATE sending goal...
[INFO] [1541560487.744455]: RUNNING
[INFO] [1541560488.745434]: RUNNING
[INFO] [1541560489.746273]: RUNNING
[INFO] [1541560490.747088]: RUNNING
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[INFO] [1541560495.752792]: RUNNING
[INFO] [1541560495.786118]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560496.754624]: SUCCESS
[INFO] [1541560497.755636]: NAVIGATE sending goal...
[INFO] [1541560497.756814]: RUNNING
[INFO] [1541560498.758104]: RUNNING
[INFO] [1541560499.758901]: RUNNING
[INFO] [1541560500.760289]: RUNNING
[INFO] [1541560501.761584]: RUNNING
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[INFO] [1541560505.765920]: RUNNING
[INFO] [1541560506.766838]: RUNNING
[INFO] [1541560506.802577]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560507.768125]: SUCCESS
[INFO] [1541560508.769323]: NAVIGATE sending goal...
[INFO] [1541560508.770256]: RUNNING
[INFO] [1541560509.770947]: RUNNING
[INFO] [1541560510.771866]: RUNNING
[INFO] [1541560511.772928]: RUNNING
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[INFO] [1541560516.779282]: RUNNING
[INFO] [1541560517.780541]: RUNNING
[INFO] [1541560518.781994]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560518.782480]: RUNNING
[INFO] [1541560519.783807]: SUCCESS
[INFO] [1541560520.785016]: NAVIGATE sending goal...
[INFO] [1541560520.785971]: RUNNING
[INFO] [1541560521.787210]: RUNNING
[INFO] [1541560522.788060]: RUNNING
[INFO] [1541560523.788994]: RUNNING
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[INFO] [1541560531.796667]: RUNNING
[INFO] [1541560532.797410]: RUNNING
[INFO] [1541560532.802936]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560533.798837]: SUCCESS
[INFO] [1541560534.799909]: NAVIGATE sending goal...
[INFO] [1541560534.800486]: RUNNING
[INFO] [1541560535.801326]: RUNNING
[INFO] [1541560536.802758]: RUNNING
[INFO] [1541560537.803675]: RUNNING
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[INFO] [1541560547.813476]: RUNNING
[INFO] [1541560547.822089]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560548.814559]: SUCCESS
[INFO] [1541560549.815447]: NAVIGATE sending goal...
[INFO] [1541560549.815964]: RUNNING
[INFO] [1541560550.816830]: RUNNING
[INFO] [1541560551.817850]: RUNNING
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[INFO] [1541560564.828410]: RUNNING
[INFO] [1541560564.843506]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560565.829362]: SUCCESS
[INFO] [1541560566.830326]: NAVIGATE sending goal...
[INFO] [1541560566.830829]: RUNNING
[INFO] [1541560567.831581]: RUNNING
[INFO] [1541560568.832745]: RUNNING
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[INFO] [1541560581.845363]: RUNNING
[INFO] [1541560582.846974]: RUNNING
[INFO] [1541560582.865583]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560583.848569]: SUCCESS
[INFO] [1541560584.849456]: NAVIGATE sending goal...
[INFO] [1541560584.850073]: RUNNING
[INFO] [1541560585.851023]: RUNNING
[INFO] [1541560586.852383]: RUNNING
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[INFO] [1541560601.871244]: RUNNING
[INFO] [1541560601.889680]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560602.873287]: SUCCESS
[INFO] [1541560603.874769]: NAVIGATE sending goal...
[INFO] [1541560603.875334]: RUNNING
[INFO] [1541560604.876476]: RUNNING
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[INFO] [1541560621.896937]: RUNNING
[INFO] [1541560622.898355]: RUNNING
[INFO] [1541560622.913970]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560623.899703]: SUCCESS
[INFO] [1541560624.900819]: NAVIGATE sending goal...
[INFO] [1541560624.901553]: RUNNING
[INFO] [1541560625.902503]: RUNNING
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[INFO] [1541560644.938527]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560645.926185]: SUCCESS
[INFO] [1541560646.926938]: NAVIGATE sending goal...
[INFO] [1541560646.927623]: RUNNING
[INFO] [1541560647.928346]: RUNNING
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[INFO] [1541560668.966195]: NAVIGATE terminated with status SUCCEEDED.
[INFO] [1541560669.952162]: SUCCESS
[INFO] [1541560670.953490]: NAVIGATE sending goal...
[INFO] [1541560670.954870]: RUNNING
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[INFO] [1541560693.994909]: NAVIGATE terminated with status SUCCEEDED.
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[INFO] [1541560722.013222]: SUCCESS
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[INFO] [1541560750.038495]: SUCCESS
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[INFO] [1541560787.075697]: SUCCESS
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[INFO] [1541560797.084045]: SUCCESS
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[INFO] [1541560802.089177]: SUCCESS
[INFO] [1541560803.090343]: SUCCESS
[INFO] [1541560804.091446]: SUCCESS
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[INFO] [1541560809.096645]: SUCCESS
[INFO] [1541560810.097542]: SUCCESS
    View Code

    以上程序源码与记录地址：https://gitee.com/xjEzekiel/bt_tree/tree/master/templates/SubTree_Gen。
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  • 原文地址：https://www.cnblogs.com/Ezekiel/p/9922418.html
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