http rewrite and pool selection based on method

You have a wayward closing brace on line 6, which closes the event "HTTP_REQUEST". HTTP::method is therefore executed outside of that scope.

I can't test it right now, but try this:

when HTTP_REQUEST {
  if {( [string tolower [HTTP::uri]] eq "/IMSWeb/IMSServlet" ) } {
        HTTP::uri "/ReservationService/IMSServlet"
      pool pool1.tcp.8780
     }

   check to determine appropriate method, perform switch statement
    if { [string tolower [HTTP::method]] eq "get" } {
       method is get, need to rewrite URI and route to appropriate pool
       switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/inventory" {
         HTTP::uri "/ReservationService/IMSServlet"
          pool pool1.tcp.8780
         }
           "/IMSWeb/Lookup" {
          HTTP::uri "/ReservationService/UI/invLookUp"
            pool pool1.tcp.8780
         }
       }
   }
   else { [string tolower [HTTP::method]] eq "put" } {
     method is put, need to rewrite host & URI and route to appropriate pool
        switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/item" {
          HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/item"
           pool pool2.tcp.80
           }
           "/IMSWeb/rest/services/inventory" {
         HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/inventory"
          pool pool2.tcp.80
           }       
        }
   }
}

thanks for the response, but still getting compile errors:

01070151:3: Rule [/Common/meh] error: /Common/meh:9: error: [undefined procedure:

Here is what I'm using:

first uri check to determine if it matches
method can be get or put, rewrite URI and route to appropriate pool
when HTTP_REQUEST {
  if {( [string tolower [HTTP::uri]] eq "/IMSWeb/IMSServlet" ) } {
        HTTP::uri "/ReservationService/IMSServlet"
      pool pool1.tcp.8780
     }
   check to determine appropriate method, perform switch statement
    if { [string tolower [HTTP::method]] eq "get" } {
       method is get, need to rewrite URI and route to appropriate pool
       switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/inventory" {
         HTTP::uri "/ReservationService/IMSServlet"
          pool pool1.tcp.8780
         }
           "/IMSWeb/Lookup" {
          HTTP::uri "/ReservationService/UI/invLookUp"
            pool pool1.tcp.8780
         }
       }
   }
   else { [string tolower [HTTP::method]] eq "put" } {
     method is put, need to rewrite host & URI and route to appropriate pool
        switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/item" {
          HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/item"
           pool pool2.tcp.80
           }
           "/IMSWeb/rest/services/inventory" {
         HTTP::host "foo.com"
          HTTP::uri "/iasserver/rest/services/inventory"
          pool pool2.tcp.80
           }       
        }
   }
}

I changed else to elseif and http::host to http::header replace Host since i'm on ver 11.4. It compiles fine now. I'll post back after my testing results.

Below is updated version:

first uri check to determine if it matches
method can be get or put, rewrite URI and route to appropriate pool
when HTTP_REQUEST {
  if {( [string tolower [HTTP::uri]] eq "/IMSWeb/IMSServlet" ) } {
        HTTP::uri "/ReservationService/IMSServlet"
      pool pool1.tcp.8780
     }
   check to determine appropriate method, perform switch statement
    if { [string tolower [HTTP::method]] eq "get" } {
       method is get, need to rewrite URI and route to appropriate pool
       switch -glob [string tolower [HTTP::uri] ] {
            "/IMSWeb/rest/services/inventory" {
         HTTP::uri "/ReservationService/IMSServlet"
         pool pool1.tcp.8780
         }
           "/IMSWeb/Lookup" {
          HTTP::uri "/ReservationService/UI/invLookUp"
            pool pool1.tcp.8780
         }
       }
   }
   elseif { [string tolower [HTTP::method]] eq "put" } {
     method is put, need to rewrite host & URI and route to appropriate pool
        switch -glob [string tolower [HTTP::uri] ] {
          "/IMSWeb/rest/services/item" {
          HTTP::header replace Host "pool2"
          HTTP::uri "/iasserver/rest/services/item"
          pool pool2.tcp.80
           }
          "/IMSWeb/rest/services/inventory" {
          HTTP::header replace Host "pool2"
          HTTP::uri "/iasserver/rest/services/inventory"
          pool pool2.tcp.80
           }       
        }
   }
}

ok back again..after fixing a few case sensitivity issues with my original code, this is working for the most part. I'm currently having issues with replacing the http host with a new value. I'm currently using 'http::header replace Host' but the new value doesn't appear to be used from my debug output.

Here is the curl command i'm using with the original request. curl -X put meh http://pool1:8380/IMSWeb/rest/services/inventory

Here is the irule debug output: Jul 31 17:13:20 lb-core-01 info tmm1[10029]: Rule /Common/pool1.tcp.8380.irule : original request:pool1:8380:/IMSWeb/rest/services/inventory Jul 31 17:13:20 lb-core-01 info tmm1[10029]: Rule /Common/pool1.tcp.8380.irule : using put method Jul 31 17:13:20 lb-core-01 info tmm1[10029]: Rule /Common/pool1.tcp.8380.irule : processing method put for /imsweb/rest/services/inventory Jul 31 17:13:20 lb-core-01 info tmm1[10029]: Rule /Common/pool1.tcp.8380.irule : The new host and uri is: pool1:8380:/iasserver/rest/services/inventory

As you can see the URI value is updated correctly from /IMSWeb/rest/services/inventory to /iasserver/rest/services/inventory but the host value is still the original value.

How can i fix this? Also, it looks like i'll also need to modify the port as well since i'm sending this traffic to port 80 vs 8380. I would imagine once i get the correct procedure to rewrite the host i could just add :80 to the end of that.

Thanks,

--Mike

Here is my updated irule:

pool1.tcp.8380.irule v1.0
7-31-2014 xxx

first uri check to determine if it matches
method can be get or put, rewrite URI and route to appropriate pool
when HTTP_REQUEST {
log local0. "original request:[HTTP::host]:[HTTP::uri]"
  if {( [string tolower [HTTP::uri]] eq "/imsweb/imsservlet" ) } {
      log local0. "condition met - routed to pool1.tcp.8780"     
      HTTP::uri "/reservationservice/imsservlet"
      pool pool1.tcp.8780
     }
   check to determine appropriate method, perform switch statement
    if { [string tolower [HTTP::method]] eq "get" } {
       method is get, need to rewrite URI and route to appropriate pool
       log local0. "using get method"
       switch -glob [string tolower [HTTP::uri] ] {
            "/imsweb/rest/services/inventory" {
         log local0. "processing method get for /imsweb/rest/services/inventory"
         HTTP::uri "/reservationservice/imsservlet"
         pool pool1.tcp.8780
         }
           "/imsweb/lookup" {
          log local0. "processing method get for /imsweb/lookup"
          HTTP::uri "/reservationservice/ui/invlookup"
            pool pool1.tcp.8780
         }
       }
   }
   elseif { [string tolower [HTTP::method]] eq "put" } {
     method is put, need to rewrite host & URI and route to appropriate pool
        log local0. "using put method"
        switch -glob [string tolower [HTTP::uri] ] {
          "/imsweb/rest/services/item" {
          log local0. "processing method put for /imsweb/rest/services/item"
          HTTP::header replace Host "pool2"
          HTTP::uri "/iasserver/rest/services/item"
          pool pool2.tcp.80
           }
          "/imsweb/rest/services/inventory" {
          log local0. "processing method put for /imsweb/rest/services/inventory"
          HTTP::header replace Host "pool2"
          HTTP::uri "/iasserver/rest/services/inventory"
          log local0. "The new host and uri is: [HTTP::host]:[HTTP::uri]"
          pool pool2.tcp.80
          }       
        }
   }
}