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Ruby を使って気軽に LTSV 形式のログをパースしたい

Ruby

Last updated at 2021-11-09Posted at 2021-11-09

$ cat access.log
time:2015-09-06T05:58:05+09:00  method:POST     uri:/foo/bar?token=xxx&uuid=1234        status:200      size:12 apptime:0.057
time:2015-09-06T06:00:43+09:00  method:GET      uri:/foo/bar    status:400      size:15 apptime:-
time:2015-09-06T06:00:43+09:00  method:GET      uri:/foo/bar/5xx        status:504      size:15 apptime:60.000

# Ruby 2.6 より前でも動くように Hash#to_h にブロックを渡さない書き方をする。
$ cat access.log | ruby -e 'ARGF.read.each_line { |line| hash = line.split("\s").map { |item| item.split(":", 2) }.to_h; puts hash.values_at("method", "uri", "status").join(" ") }'
POST /foo/bar?token=xxx&uuid=1234 200
GET /foo/bar 400
GET /foo/bar/5xx 504

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