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annotate lemuriformes/log.py @ 16:9b1bb9eee962

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misc functions related to filesystem paths
author Jeff Hammel <k0scist@gmail.com>
date Sun, 10 Dec 2017 17:19:30 -0800
parents 0d1b8bb1d97b
children
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15
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1 """
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2 ElasticSearch-style logging
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3 """
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4
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5 import json
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6 import sys
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7 import time
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8 from .cli import ConfigurationParser
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9
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10 stdout = sys.stdout
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11
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12 try:
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13 # python 2
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14 string = (str, unicode)
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15 except NameError:
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16 # python 3
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17 string = (str, )
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18
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19
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20 def read_logfile(f):
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21 """
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22 read a JSON-per-line log file's contents and return the value
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23
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24 f -- log file pointer or name
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25 """
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26
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27 if isinstance(f, string):
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28 with open(f) as _f:
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29 return read_logfile(_f)
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30 lines = f.read().strip().splitlines()
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31 return [json.loads(line) for line in lines]
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32
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33
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34 class ElasticLogger(object):
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35 """Elasticsearch-compatible log dispatcher"""
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36
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37 def __init__(self, logfilepath=None, **data):
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38 """
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39 logfilepath -- path to logfile
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40 data -- data to be included with each logging event
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41 """
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42
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43 self.logfilepath = logfilepath
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44 self.data = data
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45
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46 def write(self, f, **data):
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47 """
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48 write JSON `data` to file-like object `f`
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49 """
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50
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51 f.write(json.dumps(data, sort_keys=True) + '\n')
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52 f.flush()
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53
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54 def __call__(self, message, **kw):
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55
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56 # create log data JSON blob
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57 now = time.time()
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58 data = self.data.copy() # shallow copy
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59 data.update({'time': now,
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60 'message': message})
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61 data.update(kw)
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62
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63 # log to stdout
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64 self.write(stdout, **data)
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65
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66 if self.logfilepath:
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67 # log to a file
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68 with open(self.logfilepath, 'a') as logfile:
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69 self.write(logfile, **data)
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70
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71
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72 class ElasticLoggerParser(ConfigurationParser):
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73
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74 def add_arguments(self):
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75 self.add_argument('-l', '--log', '--logfile', dest='logfile',
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76 help="where to log events to in addition to stdout")
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77 self.add_argument('--tag', dest='tags', nargs='+', default=(),
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78 type=self.keyvalue, metavar="KEY=VALUE",
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79 help="set of key, values to tag all log lines with")
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80
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81 def logger(self):
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82 """return elastic logger instance"""
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83
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84 assert self.options is not None
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85 return ElasticLogger(self.options.logfile,
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86 **dict(self.options.tags))
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87
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88
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89 def main(args=sys.argv[1:]):
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90 """example CLI program"""
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91
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92 # parse command line
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93 parser = ElasticLoggerParser(description="my elastic diary")
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94 options = parser.parse_args()
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95
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96 # example: timestamped diary
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97 logger = parser.logger()
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98
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99 # main loop
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100 try:
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101 while True:
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102 logger(raw_input())
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103 except KeyboardInterrupt:
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104 pass
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105
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106
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107 if __name__ == '__main__':
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108 main()