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file rotate detect #12

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file rotate detect #12

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11 changes: 11 additions & 0 deletions src/tailer/__init__.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import re
import sys
import time
import os

if sys.version_info < (3,):
range = xrange
Expand All @@ -15,6 +16,7 @@ class Tailer(object):
def __init__(self, file, read_size=1024, end=False):
self.read_size = read_size
self.file = file
self.cur_file_ino = os.fstat(self.file.fileno()).st_ino
self.start_pos = self.file.tell()
if end:
self.seek_end()
Expand Down Expand Up @@ -150,6 +152,14 @@ def head(self, lines=10):
else:
return []

def _check_rotate(self):
if os.stat(self.file.name).st_ino != self.cur_file_ino:
new = open(self.file.name, "r")
self.file.close()
self.file = new
self.file.seek(0, 2)
self.cur_file_ino = os.fstat(self.file.fileno()).st_ino

def follow(self, delay=1.0):
"""\
Iterator generator that returns lines as data is added to the file.
Expand Down Expand Up @@ -180,6 +190,7 @@ def follow(self, delay=1.0):
trailing = True
self.seek(where)
time.sleep(delay)
self._check_rotate()

def __iter__(self):
return self.follow()
Expand Down