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
|
#!/usr/bin/env python
"""
Clone of the standard UNIX "ping" command.
This example shows how you can utilize some of the buitlin I/O components
in circuits to write a very simple clone of the standard UNIX "ping" command.
This example merely wraps the standard UNIX "/usr/bin/ping" command in a subprocess
using the ``circuits.io.Process`` Component for Asyncchronous I/O communications with
the process.
"""
import sys
from circuits import Component, Debugger
from circuits.io import Process, stdout, write
class Ping(Component):
# This adds the already instantiated stdout instnace
stdout = stdout
def init(self, host):
self.p = Process(['/bin/ping', host]).register(self)
self.p.start()
def read(self, data):
"""
read Event Handler
This is fired by the File Component when there is data to be read
from the underlying file that was opened.
"""
self.fire(write(data), stdout)
# Start and "run" the system.
app = Ping(sys.argv[1])
Debugger().register(app)
app.run()
|
