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comparison server/utils.py @ 395:f0ddb75bcf04

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main.c : add a delay before turning on uart server : try and improve timeouts, get rid of lightblue, don't use https, use python logging module
author Matt Johnston <matt@ucc.asn.au>
date Sun, 15 Jul 2012 21:49:59 +0800
parents dae8eb26eaa3
children
comparison
equal deleted inserted replaced
394:2cd246ea92c6 395:f0ddb75bcf04
1 import os 1 import os
2 import sys 2 import sys
3 #import ctypes 3 #import ctypes
4 import time 4 import time
5 import select 5 import select
6 import logging
6 7
7 lightblue = None 8 L = logging.info
8 try: 9 W = logging.warning
9 import lightblue 10 E = logging.error
10 except ImportError:
11 pass
12 11
13 DEFAULT_TRIES = 3 12 DEFAULT_TRIES = 3
14 READLINE_SELECT_TIMEOUT = 4 13 READLINE_SELECT_TIMEOUT = 1
15 14
16 __all__ = ('monotonic_time', 'retry') 15 __all__ = ('monotonic_time', 'retry')
17 16
18 clock_gettime = None 17 clock_gettime = None
19 no_clock_gettime = True 18 no_clock_gettime = True
32 try: 31 try:
33 librt = ctypes.CDLL('librt.so.0', use_errno=True) 32 librt = ctypes.CDLL('librt.so.0', use_errno=True)
34 clock_gettime = librt.clock_gettime 33 clock_gettime = librt.clock_gettime
35 clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)] 34 clock_gettime.argtypes = [ctypes.c_int, ctypes.POINTER(timespec)]
36 except: 35 except:
37 print>>sys.stderr, "No clock_gettime(), using fake fallback." 36 W("No clock_gettime(), using fake fallback.")
38 no_clock_gettime = True 37 no_clock_gettime = True
39 return time.time() 38 return time.time()
40 39
41 t = timespec() 40 t = timespec()
42 CLOCK_MONOTONIC = 1 # see <linux/time.h> 41 CLOCK_MONOTONIC = 1 # see <linux/time.h>
51 def retry(retries=DEFAULT_TRIES, try_time = 1): 50 def retry(retries=DEFAULT_TRIES, try_time = 1):
52 def inner(func): 51 def inner(func):
53 def new_f(*args, **kwargs): 52 def new_f(*args, **kwargs):
54 for i in range(retries): 53 for i in range(retries):
55 d = func(*args, **kwargs) 54 d = func(*args, **kwargs)
56 if d: 55 if d is not None:
57 return d 56 return d
58 time.sleep(try_time) 57 time.sleep(try_time)
58 return None
59
59 new_f.func_name = func.func_name 60 new_f.func_name = func.func_name
60 return new_f 61 return new_f
61 return inner 62 return inner
62 63
63 def readline(sock): 64 def readline(sock):
64 timeout = READLINE_SELECT_TIMEOUT 65 timeout = READLINE_SELECT_TIMEOUT
65 buf = '' 66 buf = ''
66 while True: 67 while True:
67 if not lightblue: 68 (rlist, wlist, xlist) = select.select([sock], [], [], timeout)
68 (rlist, wlist, xlist) = select.select([sock], [], [], timeout) 69 if sock not in rlist:
69 if sock not in rlist: 70 # hit timeout
70 # hit timeout 71 return None
71 return None
72 72
73 c = sock.recv(1) 73 c = sock.recv(1)
74 if c == '': 74 if c == '':
75 # lightblue timeout 75 # lightblue timeout
76 return None 76 return None
97 uc += 1 97 uc += 1
98 i += 1 98 i += 1
99 return crc 99 return crc
100 100
101 def cheap_daemon(): 101 def cheap_daemon():
102 print "Daemonising." 102 L("Daemonising.")
103 sys.stdout.flush() 103 sys.stdout.flush()
104 sys.stderr.flush() 104 sys.stderr.flush()
105 out = file('/dev/null', 'a+') 105 out = file('/dev/null', 'a+')
106 os.dup2(out.fileno(), sys.stdout.fileno()) 106 os.dup2(out.fileno(), sys.stdout.fileno())
107 os.dup2(out.fileno(), sys.stderr.fileno()) 107 os.dup2(out.fileno(), sys.stderr.fileno())
109 try: 109 try:
110 pid = os.fork() 110 pid = os.fork()
111 if pid > 0: 111 if pid > 0:
112 sys.exit(0) 112 sys.exit(0)
113 except OSError, e: 113 except OSError, e:
114 print>>sys.stderr, "Bad fork()" 114 E("Bad fork()")
115 sys.exit(1) 115 sys.exit(1)
116 116
117 os.setsid() 117 os.setsid()
118 118
119 try: 119 try:
120 pid = os.fork() 120 pid = os.fork()
121 if pid > 0: 121 if pid > 0:
122 sys.exit(0) 122 sys.exit(0)
123 except OSError, e: 123 except OSError, e:
124 print>>sys.stderr, "Bad fork()" 124 E("Bad fork()")
125 sys.exit(1) 125 sys.exit(1)
126 126
127 127