Mercurial > templog
annotate server/utils.py @ 483:93af94e6bd9d
param editor roughly working
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Tue, 04 Feb 2014 23:39:06 +0800 |
parents | f0ddb75bcf04 |
children |
rev | line source |
---|---|
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
1 import os |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
2 import sys |
331
5de3fc71ce48
- Make the python work on openwrt
Matt Johnston <matt@ucc.asn.au>
parents:
330
diff
changeset
|
3 #import ctypes |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
4 import time |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
5 import select |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
6 import logging |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
7 |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
8 L = logging.info |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
9 W = logging.warning |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
10 E = logging.error |
330
7ac6b8846eea
- some fixes for server code
Matt Johnston <matt@ucc.asn.au>
parents:
329
diff
changeset
|
11 |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
12 DEFAULT_TRIES = 3 |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
13 READLINE_SELECT_TIMEOUT = 1 |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
14 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
15 __all__ = ('monotonic_time', 'retry') |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
16 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
17 clock_gettime = None |
331
5de3fc71ce48
- Make the python work on openwrt
Matt Johnston <matt@ucc.asn.au>
parents:
330
diff
changeset
|
18 no_clock_gettime = True |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
19 def monotonic_time(): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
20 global clock_gettime |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
21 global no_clock_gettime |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
22 if no_clock_gettime: |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
23 return time.time() |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
24 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
25 class timespec(ctypes.Structure): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
26 _fields_ = [ |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
27 ('tv_sec', ctypes.c_long), |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
28 ('tv_nsec', ctypes.c_long) |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
29 ] |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
30 if not clock_gettime: |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
31 try: |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
32 librt = ctypes.CDLL('librt.so.0', use_errno=True) |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
33 clock_gettime = librt.clock_gettime |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
34 clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)] |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
35 except: |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
36 W("No clock_gettime(), using fake fallback.") |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
37 no_clock_gettime = True |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
38 return time.time() |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
39 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
40 t = timespec() |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
41 CLOCK_MONOTONIC = 1 # see <linux/time.h> |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
42 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
43 if clock_gettime(CLOCK_MONOTONIC, ctypes.pointer(t)) != 0: |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
44 errno_ = ctypes.get_errno() |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
45 raise OSError(errno_, os.strerror(errno_)) |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
46 return t.tv_sec + t.tv_nsec * 1e-9 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
47 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
48 # decorator, tries a number of times, returns None on failure, sleeps between |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
49 # Must be used as "@retry()" if arguments are defaulted |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
50 def retry(retries=DEFAULT_TRIES, try_time = 1): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
51 def inner(func): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
52 def new_f(*args, **kwargs): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
53 for i in range(retries): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
54 d = func(*args, **kwargs) |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
55 if d is not None: |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
56 return d |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
57 time.sleep(try_time) |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
58 return None |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
59 |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
60 new_f.func_name = func.func_name |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
61 return new_f |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
62 return inner |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
63 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
64 def readline(sock): |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
65 timeout = READLINE_SELECT_TIMEOUT |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
66 buf = '' |
330
7ac6b8846eea
- some fixes for server code
Matt Johnston <matt@ucc.asn.au>
parents:
329
diff
changeset
|
67 while True: |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
68 (rlist, wlist, xlist) = select.select([sock], [], [], timeout) |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
69 if sock not in rlist: |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
70 # hit timeout |
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
71 return None |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
72 |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
73 c = sock.recv(1) |
330
7ac6b8846eea
- some fixes for server code
Matt Johnston <matt@ucc.asn.au>
parents:
329
diff
changeset
|
74 if c == '': |
7ac6b8846eea
- some fixes for server code
Matt Johnston <matt@ucc.asn.au>
parents:
329
diff
changeset
|
75 # lightblue timeout |
7ac6b8846eea
- some fixes for server code
Matt Johnston <matt@ucc.asn.au>
parents:
329
diff
changeset
|
76 return None |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
77 if c == '\r': |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
78 continue |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
79 |
331
5de3fc71ce48
- Make the python work on openwrt
Matt Johnston <matt@ucc.asn.au>
parents:
330
diff
changeset
|
80 buf += c |
328
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
81 if c == '\n': |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
82 return buf |
46070aaf29ea
A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents:
diff
changeset
|
83 |
332
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
84 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
85 def crc16(buff, crc = 0, poly = 0x8408): |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
86 l = len(buff) |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
87 i = 0 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
88 while i < l: |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
89 ch = ord(buff[i]) |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
90 uc = 0 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
91 while uc < 8: |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
92 if (crc & 1) ^ (ch & 1): |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
93 crc = (crc >> 1) ^ poly |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
94 else: |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
95 crc >>= 1 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
96 ch >>= 1 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
97 uc += 1 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
98 i += 1 |
05c1249da994
- Move crc16 to utils and fix it
Matt Johnston <matt@ucc.asn.au>
parents:
331
diff
changeset
|
99 return crc |
371 | 100 |
101 def cheap_daemon(): | |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
102 L("Daemonising.") |
372 | 103 sys.stdout.flush() |
104 sys.stderr.flush() | |
105 out = file('/dev/null', 'a+') | |
106 os.dup2(out.fileno(), sys.stdout.fileno()) | |
107 os.dup2(out.fileno(), sys.stderr.fileno()) | |
108 | |
371 | 109 try: |
110 pid = os.fork() | |
111 if pid > 0: | |
112 sys.exit(0) | |
113 except OSError, e: | |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
114 E("Bad fork()") |
371 | 115 sys.exit(1) |
116 | |
117 os.setsid() | |
118 | |
119 try: | |
120 pid = os.fork() | |
121 if pid > 0: | |
122 sys.exit(0) | |
123 except OSError, e: | |
395
f0ddb75bcf04
main.c : add a delay before turning on uart
Matt Johnston <matt@ucc.asn.au>
parents:
372
diff
changeset
|
124 E("Bad fork()") |
371 | 125 sys.exit(1) |
126 | |
127 |