1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
# PyTango Training Material
This folder includes example scripts for using PyTango as a client and a server.
It is useful to refer to during training exercises.
## Acknowledgments
Portions of the source code are derived from work by multiple authors:
- https://github.com/vxgmichel
- https://github.com/tiagocoutinho
- https://github.com/ajoubertza
- https://github.com/lorenzopivetta
These repos were used:
- https://github.com/vxgmichel/icalepcs-workshop
- https://github.com/ajoubertza/icalepcs-workshop
## Setup of the Tango Development Environment
A simple Docker compose environment is useful for executing these scripts.
We use existing docker images for database, Tango Database server, TangoTest server and ipython/itango CLI.
They are from the [Square Kilometre Array Organisation](https://www.skatelescope.org) (SKAO) project.
Container services:
- **tangodb**: MariaDB database
- **databaseds**: Database Device Server, `sys/database/2`
- **tangotest**: TangoTest Device Server: `sys/tg_test/1`
- **cli**: Python command line tools, with this folder as a volume mount in `/training`
### Docker network
The docker-compose file requires a Docker network to be created, since `host`
networking is not supported on MacOS:
```commandline
docker network create pytango-training-net
```
The network can be removed, when no longer required:
```commandline
docker network rm pytango-training-net
```
### Starting and stopping the services
From the folder containing `docker-compose.yml`, the services can be started by executing:
```commandline
docker-compose up
```
Push CTRL+C to stop.
## Command-line access to ipython/itango
Once the Docker compose services are running, we can use the cli container.
A few examples are shown below.
### Start an ipython session
```shell
docker-compose exec cli ipython3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.21.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import tango
In [2]: print(tango.utils.info())
PyTango 9.3.3 (9, 3, 3)
PyTango compiled with:
Python : 3.7.3
Numpy : 1.19.2
Tango : 9.3.4
Boost : 1.67.0
PyTango runtime is:
Python : 3.7.3
Numpy : 1.19.2
Tango : 9.3.4
PyTango running on:
uname_result(system='Linux', node='86032deafb5a', release='4.19.121-linuxkit', version='#1 SMP Thu Jan 21 15:36:34 UTC 2021', machine='x86_64', processor='')
```
### Start an itango session
```shell
docker-compose exec cli itango3
ITango 9.3.3 -- An interactive Tango client.
Running on top of Python 3.7.3, IPython 7.21 and PyTango 9.3.3
help -> ITango's help system.
object? -> Details about 'object'. ?object also works, ?? prints more.
IPython profile: tango
hint: Try typing: mydev = Device("<tab>
In [1]: dev = Device("sys/tg_test/1")
In [2]: dev.ping()
Out[2]: 552
In [3]: dev.double_scalar
Out[3]: -57.588745922974105
```
### Register and run a new device
Start the device:
```shell
docker-compose exec cli bash
tango@c5f6dc31dc6b:/training$ cd server/
tango@c5f6dc31dc6b:/training/server$ ./ps0a.py test
The device server PowerSupply/test is not defined in database. Exiting!
tango@c5f6dc31dc6b:/training/server$ tango_admin --add-server PowerSupply/test PowerSupply train/ps/1
tango@c5f6dc31dc6b:/training/server$ ./ps0a.py test
Ready to accept request
```
While that is running, connect a `DeviceProxy` to it from another ipython session:
```shell
docker-compose exec cli ipython3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.21.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import tango
In [2]: dp = tango.DeviceProxy("train/ps/1")
In [3]: dp.ping()
Out[3]: 318
In [4]: dp.voltage
Out[4]: 1.23
```
### Run the power supply simulator, and a device that uses it
Ensure the gevent package is installed:
```shell
docker-compose exec cli pip install gevent
Defaulting to user installation because normal site-packages is not writeable
...
Successfully installed gevent-21.1.2 greenlet-1.1.0 zope.event-4.5.0 zope.interface-5.4.0
```
Start the power supply simulator:
```shell
docker-compose exec cli /training/server/ps-simulator.py
INFO:root:starting simulator...
INFO:simulator.45000:simulator listenning on ('', 45000)!
```
Start the power supply device:
```shell
docker-compose exec cli /training/server/ps1.py test
Ready to accept request
```
While that is running, connect to it from another ipython session:
```shell
docker-compose exec cli ipython3
Python 3.7.3 (default, Jan 22 2021, 20:04:44)
Type 'copyright', 'credits' or 'license' for more information
IPython 7.21.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import tango
In [2]: dp = tango.DeviceProxy("train/ps/1")
In [3]: dp.voltage
Out[3]: 0.1
In [4]: dp.calibrate()
In [5]:
```
## Webinars
More details of the webinars can be found online.
- 4th Tango Kernel webinar - PyTango:
https://www.tango-controls.org/community/news/2021/06/10/4th-tango-kernel-webinar-pytango/
|
