libTable: TrafficScript libraries to manage on-disk tables of data

README.md

These Riverbed TrafficScript libraries implements a means to efficiently search tables of data stored as files in the Resource directory (conf/extra) of Stingray Traffic Manager

For more details and usage instructions, check out https://splash.riverbed.com/docs/DOC-1618

Tags: #Stingray #TrafficScript #splash.riverbed.com

libTable.rts

# libTable.rts
#
# Efficient lookups of key/value data in large resource files (>100 lines) 
# Use getFirst() and getNext() to iterate through the table
 
sub lookup( $filename, $key ) {      
   update( $filename );       
   $pid = sys.getPid();      
   return data.get( "resourcetable".$pid.$filename."::".$key );   
}  

sub getFirst( $filename ) {
   update( $filename );
   $pid = sys.getPid();      
   return data.get( "resourcetable".$pid.$filename.":first" );
}

sub getNext( $filename, $key ) {
   update( $filename );
   $pid = sys.getPid();      
   return data.get( "resourcetable".$pid.$filename.":next:".$key );
}

# Internal functions

sub update( $filename ) {      
   $pid = sys.getPid();       
   $md5 = resource.getMD5( $filename );   
   if( $md5 == data.get( "resourcetable".$pid.$filename.":md5" ) ) return;       
  
   data.reset( "resourcetable".$pid.$filename.":" );      
   data.set( "resourcetable".$pid.$filename.":md5", $md5 );       
     
   $contents = resource.get( $filename );      
 
   $pkey = "";
   foreach( $l in string.split( $contents, "\n" ) ) {  
      if( ! string.regexmatch( $l, "(.*?)\\s+(.*)" ) ) continue;  
      $key = string.trim( $1 );         
      $value = string.trim( $2 );          
      data.set( "resourcetable".$pid.$filename."::".$key, $value );      
      
      if( !$pkey ) {
         data.set( "resourcetable".$pid.$filename.":first", $key );
      } else {
         data.set( "resourcetable".$pid.$filename.":next:".$pkey, $key );
      }
      $pkey = $key;
   }   
}

libTableSmall.rts

# libTableSmall.rts: Efficient lookups of key/value data in a small resource file (<100 lines)   
  
sub lookup( $filename, $key ) {       
   $contents = resource.get( $filename );   
   if( string.regexmatch( $contents, '\n'.$key.'\s+([^\n]+)' ) ) return $1;   
   if( string.regexmatch( $contents, '^'.$key.'\s+([^\n]+)' ) ) return $1;   
   return "";   
}