-
Notifications
You must be signed in to change notification settings - Fork 0
/
logreplay.py
executable file
·132 lines (108 loc) · 4.73 KB
/
logreplay.py
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
#!/usr/bin/env python
"""
Log Replay: Replay log events for testing logstash configuration
Usage: logreplay.py [-hvn] [-i INPUT_DIR] [-o OUTPUT_DIR] [-t INTERVAL] [-r VARIATION]
-h --help show this
-v --version show version
-n --no-loop do not loop when the end of a log is reached [default: false]
-i --input INPUT_DIR specify log input dir [default: /tmp/logreplay-input/]
-o --output OUTPUT_DIR specify log output dir [default: /var/log/]
-t --time-interval INTERVAL time between log events in seconds (0.1-60.0) [default: 1.0]
-r --random-variation VARIATION maximum randomized variation in seconds plus and minus [default: 10.0]
"""
from warnings import warn
from docopt import docopt
import os
import shutil
import trollius
from trollius import From
import random
VERSION = 'Log Replay 1.0'
INPUT_FILE_EXTENSIONS = ['.log']
def main(args):
input_dir = args['--input']
output_dir = args['--output']
interval = float(args['--time-interval'])
no_loop = args['--no-loop']
random_variation = float(args['--random-variation'])
print('{}, replaying logs from {} to {}'.format(VERSION, input_dir, output_dir))
try:
file_pairs = initialize_files(input_dir, output_dir)
start_write_loops(file_pairs, interval, random_variation, no_loop)
except KeyboardInterrupt:
print('Caught keyboard interrupt, exiting...')
finally:
delete_created_files(input_dir, output_dir)
def delete_created_files(input_dir, output_dir):
ds, fs = [], []
for _, dirs, files in os.walk(input_dir, onerror=_raise_error):
ds = dirs
fs = files
break
for d in ds:
dir_path = os.path.join(output_dir, d)
shutil.rmtree(dir_path)
for f in fs:
file_path = os.path.join(output_dir, f)
os.remove(file_path)
def initialize_files(input_dir, output_dir):
file_pairs = []
if not os.path.isdir(input_dir):
raise RuntimeError('Input directory {} does not exist'.format(input_dir))
if not os.listdir(input_dir):
warn('Input directory {} is empty'.format(input_dir))
if not os.path.isdir(output_dir):
raise RuntimeError('Output directory {} does not exist'.format(output_dir))
for root, dirs, files in os.walk(input_dir, onerror=_raise_error):
rel_path = os.path.relpath(root, input_dir)
output_root = os.path.join(output_dir, rel_path)
for d in dirs:
dir_path = os.path.join(output_root, d)
os.mkdir(dir_path)
for f in files:
_, ext = os.path.splitext(f)
if ext in INPUT_FILE_EXTENSIONS:
input_file, output_file = create_file_pair(root, output_root, f)
file_pairs.append((input_file, output_file))
return file_pairs
def create_file_pair(input_root, output_root, filename):
input_file_path = os.path.join(input_root, filename)
output_file_path = os.path.join(output_root, filename)
if not os.access(input_file_path, os.R_OK):
raise RuntimeError('Input file {} not readable', input_file_path)
if not os.access(output_root, os.W_OK):
raise RuntimeError('Output dir {} not writable', output_root)
return input_file_path, output_file_path
def start_write_loops(file_pairs, interval, random_variation, no_loop):
tasks = []
if not 0.1 < interval < 100.0:
raise RuntimeError('Invalid time interval value: {}'.format(interval))
loop = trollius.get_event_loop()
for input_file, output_file in file_pairs:
task = trollius.ensure_future(log_write_loop(input_file, output_file, interval, random_variation, no_loop))
tasks.append(task)
loop.run_until_complete(trollius.wait(tasks))
@trollius.coroutine
def log_write_loop(input_file, output_file, interval, random_variation, no_loop):
if os.stat(input_file).st_size == 0:
warn('Input file {} is empty'.format(input_file))
return
print('Starting write loop for file {}'.format(output_file))
while True:
with open(input_file) as i, open(output_file, 'a') as o:
for line in i:
print('Writing log entry {} -> {}'.format(input_file, output_file))
o.write(line)
o.flush()
sleepy_time = calc_sleepy_time(interval, random_variation)
yield From(trollius.sleep(sleepy_time))
if no_loop:
break
def calc_sleepy_time(interval, random_variation):
random_mod = random.uniform(-random_variation, random_variation)
random_iv = interval + random_mod
return max(0.1, random_iv)
def _raise_error(error):
raise error
if __name__ == '__main__':
main(docopt(__doc__, version=VERSION))