Created
May 21, 2016 04:56
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Python FTP接続でログファイルを監視する
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# -*- coding:utf-8 -*- | |
import os | |
# 文字コード自動判別 | |
def analyzeEncode(file, content=''): | |
lookup = ('shift_jis','euc-jp','utf-8','iso-2022-jp','ascii') | |
encode = [] | |
if os.path.exists(file): | |
f = open(file,'rb') | |
content = f.read() | |
for encoding in lookup: | |
try: | |
content.decode(encoding) | |
encode.append(encoding) | |
except UnicodeDecodeError: | |
continue | |
if len(encode) > 1: | |
# iso-2022-jp かを疑う | |
if 'shift_jis' in encode and 'euc-jp' in encode and 'iso-2022-jp' in encode: | |
# byte型(コードポイント) > 16進数 | |
buffer = "" | |
for b in content: | |
# byte型は既にコードポイントを示しているため | |
# hex() でそれを16進数表現に直す | |
buffer += hex(b) | |
# エスケープシークエンスがあれば iso-2022-jp | |
if '0x1b0x280x42' in buffer or '0x1b0x240x42' in buffer: | |
encode = ['iso-2022-jp'] | |
if len(encode) == 0: | |
try: | |
content.decode('utf-16') | |
encode.append('utf-16') | |
except UnicodeDecodeError: | |
encode.append('binary') | |
return encode[0] |
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# -*- coding:utf-8 -*- | |
# FTP接続先設定 | |
LOGFILE = '/var/www/log/hoge$TODAY$.log' | |
HOST = 'example.com' | |
USER = 'user' | |
PASSWORD = 'password' |
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# -*- coding:utf-8 -*- | |
import os, time, re, sys | |
import ftplib | |
import encode | |
from datetime import datetime | |
from ftpconst import LOGFILE, HOST, USER, PASSWORD | |
TAILNUM = 3 | |
class watchlogFTP: | |
def __init__(self, file, host, user, password): | |
self.index = 0 | |
self.content = bytearray() | |
self.charset = '' | |
self.logpath = os.path.dirname(file) | |
self.logfile = os.path.basename(file) | |
# プレースホルダー展開 | |
self.logfile = self.logfile.replace('$TODAY$', datetime.now().strftime('%Y%m%d')) | |
try: | |
self.ftp = ftplib.FTP(host, user, password) | |
except ftplib.all_errors as e: | |
print('FTP接続エラー %s' % e.message) | |
sys.exit() | |
self.ftp.sendcmd("TYPE I") # バイナリモードにする(AsciiモードではSIZEがエラーとなるため) | |
self.ftp.cwd(self.logpath) | |
def download(self, data): | |
for b in data: | |
self.content.append(b) | |
def fetchLogAppend(self, first=False): | |
self.ftp.retrbinary("RETR %s" % self.logfile, self.download) | |
# 初回は文字コードを調べて、以降その文字コードでデコードする | |
if not self.charset: | |
self.charset = encode.analyzeEncode('',self.content) | |
logdata = self.content.decode(self.charset, 'replace').strip().split("\n") | |
self.content = bytearray() | |
if self.index < len(logdata): | |
for oneRow in logdata[-TAILNUM if first else self.index:]: | |
yield oneRow | |
self.index = len(logdata) | |
def getFileSize(self): | |
size = 0 | |
try: | |
size = self.ftp.size(self.logfile) | |
except ftplib.error_perm: | |
# SIZEが実装されていない場合 or ファイルがない | |
info = self.ftp.sendcmd("STAT %s" % self.logfile) | |
tmp = info.split("\n") | |
if 3 != len(tmp): | |
print('ファイルが存在しない可能性があります') | |
ret = re.split(' +', tmp[1]) | |
size = int(ret[5]) | |
except (ftplib.error_reply,ftplib.error_temp) as e: | |
print('サーバエラー: %S' % e.message) | |
finally: | |
if 0 == size: | |
self.ftp.close() | |
sys.exit() | |
return size | |
if __name__ == '__main__': | |
wl = watchlogFTP(LOGFILE, HOST, USER, PASSWORD) | |
size = wl.getFileSize() | |
for oneRow in wl.fetchLogAppend(True): | |
print(oneRow) | |
try: | |
while True: | |
old_size = size | |
size = wl.getFileSize() | |
if old_size < size: | |
for oneRow in wl.fetchLogAppend(): | |
print(oneRow) | |
time.sleep(2.0) | |
except KeyboardInterrupt: | |
wl.ftp.close() | |
except: | |
wl.ftp.close() |
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