NXlog – Parsing Squid access logs to json


For those of you using nxlog agents to parse logs here is a working squid access.log configuration:

<Extension squid_parse_action>
      Module xm_csv
      Fields $HTTPMethod, $HTTPResponseStatus
      FieldTypes string, string
      Delimiter '/'
      EscapeControl FALSE
      UndefValue -
</Extension>

<Extension squid_parse_hierarchy>
      Module xm_csv
      Fields $action, $dst_ip
      FieldTypes string, string
      Delimiter '/'
      EscapeControl FALSE
      UndefValue -
</Extension>

<Input in_file_squid_access_log>
      Module im_file
      File "/var/log/squid/access.log"
      SavePos TRUE
      ReadFromLast TRUE
      Exec if $raw_event =~ /^(\S+)\s+(\S+) (\S+) (\S+) (\S+) (\S+) (\S+) (\S+) (\S+) (\S+)/ \
      { \
           $epochtimetmp = $1; \
           $duration = $2; \
           $src_ip = $3; \
           squid_parse_action->parse_csv($4);\
           $FileSize = $5; \
           $HTTPMethod = $6; \
           $HTTPURL = $7; \
           $ident = $8; \
           squid_parse_hierarchy->parse_csv($9); \
           $contenttype = $10; \
           if $epochtimetmp =~ s/\.//g; \
           $epochtime=integer($epochtimetmp)*1000;\
           $EventTime = datetime($epochtime); \
           $type = "squid_access_log"; \
           $Hostname = hostname(); \
           $MessageSourceAddress = hostname(); \
           $Message = $raw_event; \
           to_json();\
      } \
      else \
      {\
           $Hostname = hostname(); \
           $MessageSourceAddress = hostname(); \
           $Message=$raw_event; \
           to_json();\
      }
</Input>

The timestamp in the squid log file is in unixtime and is in seconds with milliseconds after the decimal place. The datetime function converts unix/epoch time into datetime but expects an integer containing microseconds. For this reason the function removes the decimal place and multiplies the result by 1000 to get the number of microseconds.

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