The program I wrote prints the data in the log file to the GUI. It performs filtering operations by selecting some features. I'm fetching data line by line I can fetch the line with the words according to the date and time format.
But what I want is to fetch the lines above the lines I want. When I type 5 in the Entry, I want the word I want to search to be taken 5 lines above.
For example, my word is 'Timer'. When I write Timer in the entry and I select the before lines checkbox and write 5 in the before line entry. I want to take this;
[01/01/70 02:00:18.699984 ] [debug ] [1403] [DmTr069EventHandler.c:55] [dmTr069EventHandler_init] LEAVED
[01/01/70 02:00:18.700122 ] [debug ] [1403] [DmUkaEventHandler.c:50] [dmUkaEventHandler_init] ENTERED
[01/01/70 02:00:18.700143 ] [debug ] [1403] [DmUkaEventHandler.c:52] [dmUkaEventHandler_init] LEAVED
[01/01/70 02:00:18.700154 ] [debug ] [1403] [DmAppEventHandler.c:81] [dmAppEventHandler_init] ENTERED
[01/01/70 02:00:18.700237 ] [debug ] [1403] [Timer.c:441] [addTimerToSortedTimerList] ENTERED
The code is here. I tried something but it didn't work for beforeline feature.
def search(msg, startingDate, endingDate, beforeLine, varBefore):
# clear current result
text.delete('1.0', 'end')
with open('OAM.log', 'r', encoding='latin1') as fp:
global l_no
for l_no, line in enumerate(fp, 1):
if msg and msg not in line:
# does not contain search message, skip it
continue
if startingDate or endingDate:
# get the timestamp
timestamp = parse_date(line[1:25])
# within startingDate and endingDate ?
if startingDate and timestamp < startingDate:
# before given starting date, skip it
continue
if endingDate and timestamp > endingDate:
# after given ending date, skip it
continue
"""for count, beforeLine in enumerate(fp, 1):
#bfline = fp.readlines(l_no - count)
count -= 1
text.insert('end', ' \n ')
text.insert('end', f'Before Line Number: {l_no - beforeEntryVar.get()} Log: {beforeLine}')
text.insert('end', ' \n ')"""
# insert the log
text.insert('end', ' \n ')
text.insert('end', f'Line Number: {l_no} Log: {line}')
text.insert('end', ' \n ')
The easiest way to do this is with a deque as follows:
import re
from collections import deque
def read_logfile(filename, key, maxlines):
p = r'(?<=\[).+?(?=\])'
d = deque([], maxlines)
with open(filename) as log:
for line in map(str.strip, log):
d.append(line)
if len(m := re.findall(p, line)) > 3 and m[3].startswith(key):
return d
return []
print(*read_logfile('OAM.log', 'Timer', 5), sep='\n')
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