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Craig_Gibb_1781's avatar
Craig_Gibb_1781
Icon for Nimbostratus rankNimbostratus
May 25, 2015

Problems with string map and wildcard

Hi i need to replace a string av characters in a uri but only if the uri starts with the following:- /MacBlue_SAMTV/GetAttachmentDownloadInfo

I have tried to do this with the following irule:-

 Check host and path for relevant link
     when HTTP_REQUEST { 
 if { [HTTP::uri] starts_with "/MacBlue_SAMTV/GetAttachmentDownloadInfo" and [HTTP::uri]
  contains "&encoding=TVOD_*_*" } {         

 Replace encoding with MPEG-4
string map { "encoding=TVOD_*_*" "&encoding=MPEG-4" "&encoding=TVOD_*_*" "&encoding=MPEG-4" } HTTP::uri }
}

This does not seem to work, it maybe the wildcards, any suggestions ? Would it be the best way to do this as regards performance.

/Craig

application delivery
devops
iRules

8 Replies

  • nitass's avatar
    nitass
    Icon for Employee rankEmployee
    May 26, 2015

    what about this?

     configuration

[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when RULE_INIT {
  set static::uri "/MacBlue_SAMTV/GetAttachmentDownloadInfo"
  set static::param_name "encoding"
  set static::param_value "TVOD_"
  set static::param_newvalue "MPEG-4"
}
when HTTP_REQUEST {
  log local0. "before: uri=[HTTP::uri]"
  if { [HTTP::uri] starts_with $static::uri } {
    set value [URI::query [HTTP::uri] $static::param_name]
    if { $value starts_with $static::param_value } {
      HTTP::query [string map [list $static::param_name=$value $static::param_name=$static::param_newvalue] [HTTP::query]]
    }
  }
}
when HTTP_REQUEST priority 1000 {
  log local0. "after: uri=[HTTP::uri]"
}
}

 /var/log/ltm

May 26 11:42:15 ve11c info tmm[32414]: Rule /Common/qux : before: uri=/something
May 26 11:42:15 ve11c info tmm[32414]: Rule /Common/qux : after: uri=/something

May 26 11:42:32 ve11c info tmm1[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?something=1234
May 26 11:42:32 ve11c info tmm1[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?something=1234

May 26 11:42:42 ve11c info tmm[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?encoding=TVOD_123_456&test=789
May 26 11:42:42 ve11c info tmm[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?encoding=MPEG-4&test=789

May 26 11:42:59 ve11c info tmm1[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?prefix=abc&encoding=TVOD_123_456&test=789
May 26 11:42:59 ve11c info tmm1[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?prefix=abc&encoding=MPEG-4&test=789
    • CGI's avatar
      CGI
      Icon for Altostratus rankAltostratus
      May 26, 2015
      Thanks I will give it a go and let you know, could we hav e done this with stream profile ? /Craig
    • nitass's avatar
      nitass
      Icon for Employee rankEmployee
      May 26, 2015
      with http profile, stream profile/irule does rewrite http payload only (request and header are not included).
    • CGI's avatar
      CGI
      Icon for Altostratus rankAltostratus
      May 31, 2015
      The rule worked so thanks for the help /Craig
  • nitass_89166's avatar
    nitass_89166
    Icon for Noctilucent rankNoctilucent
    May 26, 2015

    what about this?

     configuration

[root@ve11c:Active:In Sync] config  tmsh list ltm rule qux
ltm rule qux {
    when RULE_INIT {
  set static::uri "/MacBlue_SAMTV/GetAttachmentDownloadInfo"
  set static::param_name "encoding"
  set static::param_value "TVOD_"
  set static::param_newvalue "MPEG-4"
}
when HTTP_REQUEST {
  log local0. "before: uri=[HTTP::uri]"
  if { [HTTP::uri] starts_with $static::uri } {
    set value [URI::query [HTTP::uri] $static::param_name]
    if { $value starts_with $static::param_value } {
      HTTP::query [string map [list $static::param_name=$value $static::param_name=$static::param_newvalue] [HTTP::query]]
    }
  }
}
when HTTP_REQUEST priority 1000 {
  log local0. "after: uri=[HTTP::uri]"
}
}

 /var/log/ltm

May 26 11:42:15 ve11c info tmm[32414]: Rule /Common/qux : before: uri=/something
May 26 11:42:15 ve11c info tmm[32414]: Rule /Common/qux : after: uri=/something

May 26 11:42:32 ve11c info tmm1[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?something=1234
May 26 11:42:32 ve11c info tmm1[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?something=1234

May 26 11:42:42 ve11c info tmm[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?encoding=TVOD_123_456&test=789
May 26 11:42:42 ve11c info tmm[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?encoding=MPEG-4&test=789

May 26 11:42:59 ve11c info tmm1[32414]: Rule /Common/qux : before: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?prefix=abc&encoding=TVOD_123_456&test=789
May 26 11:42:59 ve11c info tmm1[32414]: Rule /Common/qux : after: uri=/MacBlue_SAMTV/GetAttachmentDownloadInfo?prefix=abc&encoding=MPEG-4&test=789
    • CGI's avatar
      CGI
      Icon for Altostratus rankAltostratus
      May 26, 2015
      Thanks I will give it a go and let you know, could we hav e done this with stream profile ? /Craig
    • nitass_89166's avatar
      nitass_89166
      Icon for Noctilucent rankNoctilucent
      May 26, 2015
      with http profile, stream profile/irule does rewrite http payload only (request and header are not included).
    • CGI's avatar
      CGI
      Icon for Altostratus rankAltostratus
      May 31, 2015
      The rule worked so thanks for the help /Craig