| author | Tero Marttila <terom@paivola.fi> |
| Sun, 13 Jan 2013 01:50:25 +0200 | |
| changeset 114 | 2e88e1d8e604 |
| parent 73 | ef01c4639689 |
| child 122 | f742c866c765 |
| permissions | -rw-r--r-- |
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pvl.syslog: import from pvl-collectd
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parents:
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""" |
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Iterate over input lines in filesystem files. |
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parents:
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""" |
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pvl.syslog: import from pvl-collectd
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parents:
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pvl.syslog: import from pvl-collectd
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parents:
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import os |
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parents:
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import logging; log = logging.getLogger('pvl.syslog.tail')
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parents:
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class Tail (object) : |
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parents:
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""" |
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parents:
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Follow a file on the filesystem, reading lines until EOF, and re-opening if replaced. |
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parents:
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Never blocks, no fileno() to poll. Just poll(timeout=POLL). |
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parents:
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Not writable. |
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2e88e1d8e604
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parents:
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""" |
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2e88e1d8e604
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parents:
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parents:
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POLL = 2.0 |
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def __init__ (self, path, skip=None, **opts) : |
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log.debug("%s", path)
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parents:
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self.path = path |
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self.reopen() |
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parents:
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if skip : |
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parents:
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self.skip() |
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parents:
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pvl.syslog.tail: split into pvl.syslog.file/tail, clarify line/None/EOFError behaviour
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parents:
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def open (self) : |
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parents:
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log.debug("%s", self)
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parents:
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return open(self.path, 'r') |
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parents:
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def stat (self) : |
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parents:
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""" |
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parents:
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Return a key identifying the file at our path. |
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parents:
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""" |
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parents:
diff
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parents:
diff
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st = os.stat(self.path) |
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parents:
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stat = st.st_dev, st.st_ino |
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log.debug("%s: %s", self, stat)
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return stat |
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parents:
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pvl.syslog.tail: split into pvl.syslog.file/tail, clarify line/None/EOFError behaviour
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parents:
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def reopen (self) : |
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parents:
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""" |
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parents:
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Re-initialize our file state from path. |
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parents:
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""" |
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parents:
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# XXX: use fstat for "atomic" open+stat? |
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self.file = self.open() |
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parents:
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self._stat = self.stat() |
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parents:
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def changed (self) : |
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parents:
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""" |
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parents:
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Has the underlying file changed? |
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parents:
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""" |
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parents:
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return self.stat() != self._stat |
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def raedline (self) : |
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""" |
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parents:
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Reads any available line from file. |
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parents:
73
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pvl.syslog.tail: split into pvl.syslog.file/tail, clarify line/None/EOFError behaviour
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parents:
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Returns None if at EOF. |
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Tero Marttila <terom@paivola.fi>
parents:
73
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""" |
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parents:
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parents:
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def readline (self) : |
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""" |
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parents:
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Reads a line from the file, without trailing \n. |
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parents:
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pvl.syslog.tail: split into pvl.syslog.file/tail, clarify line/None/EOFError behaviour
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parents:
73
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Returns None on EOF. |
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parents:
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""" |
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parents:
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parents:
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line = self.file.readline() |
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parents:
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if not line : |
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line = None |
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else : |
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line = line.rstrip('\r\n')
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parents:
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log.debug("%s", line)
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return line |
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parents:
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parents:
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def readlines (self, eof_mark=False) : |
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parents:
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""" |
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parents:
diff
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Reads any available lines from the file. |
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parents:
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parents:
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Reopens the file on EOF if the underlying file changed. |
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parents:
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parents:
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eof_mark: yields a special None line when this happens. |
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parents:
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""" |
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parents:
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parents:
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while True : |
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parents:
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line = self.readline() |
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parents:
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parents:
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if line : |
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100 |
yield line |
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101 |
|
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114
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102 |
elif self.changed() : |
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103 |
log.debug("EOF: reopen")
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104 |
self.reopen() |
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105 |
|
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106 |
if eof_mark : |
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107 |
yield None # special token |
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108 |
|
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109 |
# keep going |
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110 |
continue |
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111 |
|
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112 |
else : |
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113 |
log.debug("EOF: wait")
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114 |
break |
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115 |
|
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116 |
__iter__ = readlines |
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117 |
|
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118 |
def skip (self) : |
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119 |
""" |
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120 |
Skip any available lines. |
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121 |
""" |
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122 |
|
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123 |
for line in self.readlines() : |
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124 |
pass |
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125 |
|
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|
126 |
|
|
53
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127 |
def __str__ (self) : |
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128 |
return self.path |
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129 |