templog: server/utils.py annotate

annotate server/utils.py @ 171:898d0cfecffd

merge

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 25 Apr 2013 21:04:36 +0800
parents	51d889ad39a3
children

rev	line source
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 import os
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 import sys
25 2943f62c8e62 - Make the python work on openwrt Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	3 #import ctypes
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 import time
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 import select
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	6 import logging
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	8 L = logging.info
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	9 W = logging.warning
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	10 E = logging.error
24 44c5ab5ea879 - some fixes for server code Matt Johnston <matt@ucc.asn.au> parents: 23 diff changeset	11
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 DEFAULT_TRIES = 3
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	13 READLINE_SELECT_TIMEOUT = 1
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 __all__ = ('monotonic_time', 'retry')
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 clock_gettime = None
25 2943f62c8e62 - Make the python work on openwrt Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	18 no_clock_gettime = True
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 def monotonic_time():
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 global clock_gettime
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 global no_clock_gettime
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 if no_clock_gettime:
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 return time.time()
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 class timespec(ctypes.Structure):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 _fields_ = [
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 ('tv_sec', ctypes.c_long),
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 ('tv_nsec', ctypes.c_long)
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 ]
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 if not clock_gettime:
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 try:
885532437100 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)
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 clock_gettime = librt.clock_gettime
885532437100 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)]
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 except:
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	36 W("No clock_gettime(), using fake fallback.")
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37 no_clock_gettime = True
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 return time.time()
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 t = timespec()
885532437100 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>
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42
885532437100 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:
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 errno_ = ctypes.get_errno()
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 raise OSError(errno_, os.strerror(errno_))
885532437100 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
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47
885532437100 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
885532437100 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
885532437100 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):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 def inner(func):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 def new_f(args, *kwargs):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53 for i in range(retries):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 d = func(args, *kwargs)
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	55 if d is not None:
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	56 return d
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57 time.sleep(try_time)
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	58 return None
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	59
22 885532437100 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
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61 return new_f
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 return inner
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64 def readline(sock):
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 timeout = READLINE_SELECT_TIMEOUT
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	66 buf = ''
24 44c5ab5ea879 - some fixes for server code Matt Johnston <matt@ucc.asn.au> parents: 23 diff changeset	67 while True:
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	68 (rlist, wlist, xlist) = select.select([sock], [], [], timeout)
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	69 if sock not in rlist:
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	70 # hit timeout
51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	71 return None
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 c = sock.recv(1)
24 44c5ab5ea879 - some fixes for server code Matt Johnston <matt@ucc.asn.au> parents: 23 diff changeset	74 if c == '':
44c5ab5ea879 - some fixes for server code Matt Johnston <matt@ucc.asn.au> parents: 23 diff changeset	75 # lightblue timeout
44c5ab5ea879 - some fixes for server code Matt Johnston <matt@ucc.asn.au> parents: 23 diff changeset	76 return None
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 if c == '\r':
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	78 continue
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79
25 2943f62c8e62 - Make the python work on openwrt Matt Johnston <matt@ucc.asn.au> parents: 24 diff changeset	80 buf += c
22 885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	81 if c == '\n':
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 return buf
885532437100 A bit of work on the server python Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83
26 d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	84 # from http://blog.stalkr.net/2011/04/pctf-2011-32-thats-no-bluetooth.html
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	85 def crc16(buff, crc = 0, poly = 0x8408):
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	86 l = len(buff)
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	87 i = 0
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	88 while i < l:
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	89 ch = ord(buff[i])
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	90 uc = 0
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	91 while uc < 8:
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	92 if (crc & 1) ^ (ch & 1):
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	93 crc = (crc >> 1) ^ poly
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	94 else:
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	95 crc >>= 1
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	96 ch >>= 1
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	97 uc += 1
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	98 i += 1
d3e5934fe55c - Move crc16 to utils and fix it Matt Johnston <matt@ucc.asn.au> parents: 25 diff changeset	99 return crc
65 b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	100
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	101 def cheap_daemon():
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	102 L("Daemonising.")
66 c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	103 sys.stdout.flush()
c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	104 sys.stderr.flush()
c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	105 out = file('/dev/null', 'a+')
c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	106 os.dup2(out.fileno(), sys.stdout.fileno())
c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	107 os.dup2(out.fileno(), sys.stderr.fileno())
c5ad12670cae dup2 to devnull Matt Johnston <matt@ucc.asn.au> parents: 65 diff changeset	108
65 b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	109 try:
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	110 pid = os.fork()
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	111 if pid > 0:
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	112 sys.exit(0)
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	113 except OSError, e:
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	114 E("Bad fork()")
65 b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	115 sys.exit(1)
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	116
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	117 os.setsid()
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	118
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	119 try:
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	120 pid = os.fork()
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	121 if pid > 0:
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	122 sys.exit(0)
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	123 except OSError, e:
89 51d889ad39a3 main.c : add a delay before turning on uart Matt Johnston <matt@ucc.asn.au> parents: 66 diff changeset	124 E("Bad fork()")
65 b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	125 sys.exit(1)
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	126
b09c164debf6 cheap_daemon() Matt Johnston <matt@ucc.asn.au> parents: 47 diff changeset	127

Mercurial > templog

annotate server/utils.py @ 171:898d0cfecffd