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
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
from doctest import FAIL_FAST
import os
import sys
import atexit
import time
import threading
import signal
class DeamonDecorator:
pass
class SpiderDeamon:
def __init__(self, pid_path, stdin = os.devnull, stdout = os.devnull, stderr = os.devnull, home_dir = '.', umask = 18, verbose = 1):
self.stdin = stdin
self.stdout = stdout
self.stderr = stderr
self.pid_path = pid_path
self.home_dir = home_dir
self.umask = umask
self.verbose = verbose
self.daemon_alive = True
super().__init__()
def ps_daemon(self):
pid = os.fork()
if pid:
sys.exit(0)
os.chdir(self.home_dir)
os.setsid()
os.umask(self.umask)
pid = os.fork()
if pid:
sys.exit(0)
sys.stdout.flush()
sys.stderr.flush()
si = open(self.stdin, 'r')
so = open(self.stdout, 'a+')
if self.stderr:
se = open(self.stderr, 'wb', 0)
else:
se = so
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
def sig_handler(signum ,frame):
self.daemon_alive = False
signal.signal(signal.SIGTERM, sig_handler)
signal.signal(signal.SIGINT, sig_handler)
if self.verbose >= 1:
print('Little Spider start work.')
atexit.register(self.del_pid)
pid = str(os.getpid())
open(self.pid_path, 'w+').write('%s\n' % pid)
def get_pid(self):
try:
fh = open(self.pid_path, 'r')
pid = int(fh.read().strip())
fh.close()
except IOError:
pid = None
except SystemExit:
pid = None
return pid
def del_pid(self):
if os.path.exists(self.pid_path):
os.remove(self.pid_path)
def start(self, *args, **kwars):
if self.verbose >= 1:
print('Little spider going to work ...')
pid = self.get_pid()
if pid:
msg = 'pid file %s already exists, is the little spider already working ?\n'
sys.stderr.write( msg % self.pid_path)
sys.exit(1)
self.ps_daemon()
self.run(*args, **kwars)
def stop(self):
if self.verbose >= 1:
print("Little spider going to stop")
pid = self.get_pid()
if not pid:
msg = "Pid file [%s] does not exist. Is it running?\n" % self.pid_path
sys.stderr.write(msg)
if os.path.exists(self.pid_path):
os.remove(self.pid_path)
return
try:
i = 0
while 1:
os.kill(pid, signal.SIGTERM)
time.sleep(0.1)
i = i + 1
if i % 10 == 0:
os.kill(pid, signal.SIGHUP)
os.remove(self.pid_path)
except OSError:
print(OSError)
print("Something Error Here !")
pass
def restart(self, *args, **kwargs):
self.stop()
self.start(*args, **kwargs)
def status(self):
pid = self.get_pid()
return pid
def run(self, *args, **kwargs):
print("Base class run()")
class PoemSpiderDaemon(SpiderDeamon):
def __init__(self, name, pid_path, stdin=os.devnull, stdout=os.devnull, stderr=os.devnull, home_dir='.', umask=18, verbose=1):
super().__init__(pid_path, stdin, stdout, stderr, home_dir, umask, verbose)
self.name = name
def run(self, output_fn, **kwargs):
fd = open(output_fn, 'w')
while True:
line = time.ctime() + '\n'
fd.write(line)
fd.flush()
time.sleep(1)
fd.close()
def ps_daemon(pid_file = None):
pid = os.fork()
if pid:
sys.exit(0)
os.chdir('/')
os.umask(0)
os.setsid()
sys.stdout.flush()
sys.stderr.flush()
if pid_file:
with open(pid_file, 'w+') as f:
f.write(str(os.getpid()))
atexit.register(os.remove, pid_file)
ps_spider()
def ps_spider():
while True:
print("Happly Little spider")
time.sleep(5)
if __name__ == '__main__':
help_msg = 'Usage: python3 ps_daemon.py <start|stop|restart|status>'
if len(sys.argv) != 2:
print(help_msg)
sys.exit(1)
psd_name = 'poem_spider_daemon'
pid_file = '/Users/shiqiang/Projects/py-spider/poem-spider/psd.pid'
log_file = '/Users/shiqiang/Projects/py-spider/poem-spider/psd.log'
err_file = '/Users/shiqiang/Projects/py-spider/poem-spider/psd-error.log'
psd = PoemSpiderDaemon(psd_name, pid_file, stderr=err_file, verbose=1)
if sys.argv[1] == 'start':
psd.start(log_file)
elif sys.argv[1] == 'stop':
psd.stop()
elif sys.argv[1] == 'restart':
psd.restart(log_file)
elif sys.argv[1] == 'status':
alive = psd.status()
if alive:
print("Poem Daemon [%s] is running ......" % (psd.get_pid()) )
else:
print("Poem Daemon stopped")
else:
print("Invalid parameter")
print(help_msg)
|
