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VMOD_VAR(3)		    Library Functions Manual		     VMOD_VAR(3)

NAME
     vmod_var - Variable support for Varnish VCL

SYNOPSIS
	import var [as name] [from "path"]

	VOID set(STRING key, STRING value)

	STRING get(STRING)

	VOID global_set(STRING, STRING)

	STRING global_get(STRING)

	VOID set_int(STRING key, INT value)

	INT get_int(STRING key)

	VOID set_string(STRING key, STRING value)

	STRING get_string(STRING key)

	VOID set_real(STRING key, REAL value)

	REAL get_real(STRING key)

	VOID set_duration(STRING key, DURATION value)

	DURATION get_duration(STRING key)

	VOID set_ip(STRING key, IP value)

	IP get_ip(STRING key)

	VOID set_backend(STRING key, BACKEND value)

	BACKEND get_backend(STRING key)

	VOID clear()

     This VMOD implements basic variable support in VCL.

     It  supports  strings,  integers, real numbers, durations, IP addresses and
     backends. There are methods to get and set each data type.

     Global variables have a lifespan that extends across requests and VCLs, for
     as long as the vmod is loaded. Global variables only support strings.

     The remaining functions have PRIV_TASK lifespan and are local to  a  single
     request or backend request.

     Example:

	vcl 4.0;
	import var;

	backend default { .host = "192.0.2.11"; .port = "8080"; }

	sub vcl_recv {
	    # Set and get some values.
	    var.set("foo", "bar");
	    set req.http.x-foo = var.get("foo");

	    var.set_int("ten", 10);
	    var.set_int("five", 5);
	    set req.http.twenty = var.get_int("ten") + var.get_int("five") + 5;

	    # VCL will use the first token to decide final data type. Headers are strings.
	    # set req.http.X-lifetime = var.get_int("ten") + " seconds"; #  Won't work.
	    set req.http.X-lifetime = "" + var.get_int("ten") + " seconds";  # Works!

	    var.set_duration("timedelta", 1m);	# 60s
	    set req.http.d1 = var.get_duration("timedelta");

	    var.set_ip("endpoint", client.ip);
	    set req.http.x-client = var.get_ip("endpoint");

	    # Unset all non-global variables.
	    var.clear();

	    # Demonstrate use of global variables as state flags.
	    if (req.url ~ "/close$") {
		var.global_set("open", "no");
	    }
	    else if (req.url ~ "/open$") {
		var.global_set("open", "yes");
	    }

	    if (var.global_get("open") != "yes") {
		return (synth(200, "We are currently closed, sorry!"));
	    }
	}

   VOID set(STRING key, STRING value)
     Set key to value.

   STRING get(STRING)
     Get  key with data type STRING. If stored key is not a STRING a NULL string
     is returned.

   VOID global_set(STRING, STRING)
   STRING global_get(STRING)
   VOID set_int(STRING key, INT value)
     Set key to value.

   INT get_int(STRING key)
     Get key with data type INT. If stored key is not an INT zero  will  be  re-
     turned.

   VOID set_string(STRING key, STRING value)
     Identical to set().

   STRING get_string(STRING key)
     Identical to get().

   VOID set_real(STRING key, REAL value)
     Set key to value.

   REAL get_real(STRING key)
     Get  key  with data type REAL. If stored key is not a REAL zero will be re-
     turned.

   VOID set_duration(STRING key, DURATION value)
     Set key to value.

   DURATION get_duration(STRING key)
     Get key with data type DURATION. If stored key is not a DURATION zero  will
     be returned.

   VOID set_ip(STRING key, IP value)
     Set key to value.

   IP get_ip(STRING key)
     Get  key  with  data  type  IP. If stored key is not an IP null will be re-
     turned.

   VOID set_backend(STRING key, BACKEND value)
     Set key to value.

   BACKEND get_backend(STRING key)
     Get key with data type BACKEND. If stored key is not a BACKEND,  null  will
     be returned.

   VOID clear()
     Clear all non-global variables.

								     VMOD_VAR(3)

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