author | Tero Marttila <terom@paivola.fi> |
Sat, 08 Mar 2014 14:37:20 +0200 | |
changeset 30 | 1053e69664a6 |
parent 18 | 48d94f45b242 |
permissions | -rw-r--r-- |
2
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
1 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
2 |
Non-blocking fifo reads. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
3 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
4 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
5 |
import os |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
6 |
import errno |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
7 |
import fcntl |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
8 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
9 |
import logging |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
10 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
11 |
log = logging.getLogger('pvl.syslog.fifo') |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
12 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
13 |
class Pipe (object) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
14 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
15 |
A pipe from a fd. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
16 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
17 |
Supports reading lines in a non-blocking fashion. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
18 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
19 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
20 |
@classmethod |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
21 |
def file (cls, file) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
22 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
23 |
Create Pipe from file, e.g. sys.stdin. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
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|
24 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
25 |
Puts fd into nonblocking mode, which means that the given file will stop working! |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
26 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
27 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
28 |
fd = file.fileno() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
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|
29 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
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|
30 |
log.debug("%s: %s", file, fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
31 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
32 |
fl = fcntl.fcntl(fd, fcntl.F_GETFL) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
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|
33 |
fl |= os.O_NONBLOCK |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
34 |
fcntl.fcntl(fd, fcntl.F_SETFL, fl) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
35 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
36 |
return cls(fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
37 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
38 |
def __init__ (self, fd) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
39 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
40 |
May pass fd=None to open as closed. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
41 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
42 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
43 |
self._fd = fd |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
44 |
self._buf = '' |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
45 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
46 |
log.debug("pipe: %d", fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
47 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
48 |
def open (self, fd) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
49 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
50 |
re-open closed pipe to use the given fd. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
51 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
52 |
Raises ValueError if already open. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
53 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
54 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
55 |
if self._fd is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
56 |
self._fd = fd |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
57 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
58 |
raise ValueError("%s: re-opening already open pipe: %s" % (self, fd)) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
59 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
60 |
# XXX: good idea? |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
61 |
def __nonzero__ (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
62 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
63 |
Test if we are open. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
64 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
65 |
XXX: signal EOF as well? |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
66 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
67 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
68 |
return self._fd is not None |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
69 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
70 |
def fileno (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
71 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
72 |
Return the internal fd. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
73 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
74 |
Raises ValueError if we are closed. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
75 |
XXX: EOFError? |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
76 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
77 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
78 |
if self._fd is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
79 |
raise ValueError("I/O operation on closed pipe: %s" % (self, )) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
80 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
81 |
return self._fd |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
82 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
83 |
# XXX: this is almost identical to pvl.socket.ReadStream |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
84 |
def read (self, n=512) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
85 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
86 |
Read up to n bytes. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
87 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
88 |
Returns None if we would block. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
89 |
Raises EOFError on EOF, or closed. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
90 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
91 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
92 |
try : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
93 |
buf = os.read(self.fileno(), n) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
94 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
95 |
except OSError as ex : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
96 |
# block? |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
97 |
if ex.errno == errno.EAGAIN : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
98 |
# empty |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
99 |
buf = None |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
100 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
101 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
102 |
raise |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
103 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
104 |
log.debug("%s: %s", self, buf) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
105 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
106 |
if buf is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
107 |
return None |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
108 |
elif buf : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
109 |
return buf |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
110 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
111 |
raise EOFError() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
112 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
113 |
def readline (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
114 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
115 |
Read and return next waiting line from input. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
116 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
117 |
Line is returned without trailing '\n'. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
118 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
119 |
Returns None if there is no line available. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
120 |
Raises EOFError if the fifo write end was closed. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
121 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
122 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
123 |
while '\n' not in self._buf : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
124 |
# read chunk |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
125 |
read = self.read() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
126 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
127 |
if read is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
128 |
return None |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
129 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
130 |
self._buf += read |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
131 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
132 |
# split out one line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
133 |
line, self._buf = self._buf.split('\n', 1) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
134 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
135 |
log.debug("%s", line) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
136 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
137 |
return line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
138 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
139 |
def readlines (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
140 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
141 |
Read any available input, yielding lines. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
142 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
143 |
Re-opens the FIFO on EOF. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
144 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
145 |
Returns None if there was no more input available, or the fifo was re-opened after EOF. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
146 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
147 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
148 |
while True : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
149 |
# pull line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
150 |
line = self.readline() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
151 |
|
18
48d94f45b242
pvl.syslog.fifo: fix difference between empty line and EOF
Tero Marttila <terom@paivola.fi>
parents:
2
diff
changeset
|
152 |
if line is not None : |
2
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
153 |
yield line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
154 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
155 |
return # block |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
156 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
157 |
__iter__ = readlines |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
158 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
159 |
def close (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
160 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
161 |
Close our fd, if open. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
162 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
163 |
May be open()'d again. Meanwhile, all operatations will raise EOFError. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
164 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
165 |
log.warn's if already closed. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
166 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
167 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
168 |
if self._fd is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
169 |
log.warn("%s: already closed", self) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
170 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
171 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
172 |
log.debug("%s: %s", self, self._fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
173 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
174 |
os.close(self._fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
175 |
self._fd = None |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
176 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
177 |
def __str__ (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
178 |
return "pipe({self._fd})".format(self=self) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
179 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
180 |
class Fifo (Pipe) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
181 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
182 |
A named pipe(7) on the filesystem. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
183 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
184 |
Supports reading lines in a non-blocking fashion, and re-opening on EOF. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
185 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
186 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
187 |
def __init__ (self, path) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
188 |
self.path = path |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
189 |
Pipe.__init__(self, self._open()) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
190 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
191 |
def _open (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
192 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
193 |
Open the internal fd (nonblocking). |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
194 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
195 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
196 |
fd = os.open(self.path, os.O_RDONLY | os.O_NONBLOCK) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
197 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
198 |
log.debug("%s: open: %s", self, fd) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
199 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
200 |
return fd |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
201 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
202 |
def open (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
203 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
204 |
Re-open the FIFO. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
205 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
206 |
Used when the writing end was closed, and read gave EOF. Opening the fifo again will clear the EOF condition, |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
207 |
and resume nonblocking mode. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
208 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
209 |
Raises ValueError() if already open. close() first. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
210 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
211 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
212 |
Pipe.open(self, self._open()) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
213 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
214 |
def readlines (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
215 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
216 |
Read any available input, yielding lines. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
217 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
218 |
Re-opens the FIFO on EOF. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
219 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
220 |
Returns None if there was no more input available, or the fifo was re-opened after EOF. |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
221 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
222 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
223 |
while True : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
224 |
try : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
225 |
# pull line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
226 |
line = self.readline() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
227 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
228 |
except EOFError : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
229 |
log.debug("%s: EOF: reopen", self) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
230 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
231 |
# reopen and go back to waiting |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
232 |
self.close() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
233 |
self.open() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
234 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
235 |
return |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
236 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
237 |
if line is None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
238 |
log.debug("%s: EOF: wait", self) |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
239 |
return # wait |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
240 |
else : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
241 |
yield line |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
242 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
243 |
__iter__ = readlines |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
244 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
245 |
def __str__ (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
246 |
return self.path |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
247 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
248 |
# XXX: we need to figure out what references we have lying around, and clean those out! |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
249 |
def __del__ (self) : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
250 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
251 |
Cleanup |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
252 |
""" |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
253 |
|
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
254 |
if self._fd is not None : |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
255 |
self.close() |
5a8a32cbc944
import pvl.syslog from pvl-verkko
Tero Marttila <terom@paivola.fi>
parents:
diff
changeset
|
256 |