VCl Configuration file for varnish.

default.vcl

#
# This is an example VCL file for Varnish.
#
# It does not do anything by default, delegating control to the
# builtin VCL. The builtin VCL is called when there is no explicit
# return statement.
#
# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/
# and https://www.varnish-cache.org/trac/wiki/VCLExamples for more examples.

# Marker to tell the VCL compiler that this VCL has been adapted to the
# new 4.0 format.
vcl 4.0;
import std;

# Default backend definition. Set this to point to your content server.
backend default {
    .host = "127.0.0.1";
    .port = "8080";
}

sub vcl_recv {
    # Happens before we check if we have this in cache already.
    #
    # Typically you clean up the request here, removing cookies you don't need,
    # rewriting the request, etc.
    
    if (req.method == "PURGE") {

        if (!req.http.Cookie ~ "bookstorecache") {
            return(synth(405,"Not allowed."));
        }
        ban("req.http.host ~ .*");
        return (synth(200, "Purged"));
    }

    if ( req.url ~ "^/rest/V1/readbook" && (! req.http.Accept ~ "xml")) { 
      return (hash);
    }

    if ( req.url ~ "^/rest/V1/writebook" && ( !req.http.Accept ~ "xml")) {
      return (hash);
    }

    if ( req.url ~ "^/rest/V1/deletebook" && ( !req.http.Accept ~ "xml")) {
      return (hash);
    }

    if ( req.url ~ "^/rest/V1/addbook" && ( !req.http.Accept ~ "xml")) {
      return (hash);
    }
    return (pass);
}

sub vcl_backend_response {
    # Happens after we have read the response headers from the backend.
    #
    # Here you clean the response headers, removing silly Set-Cookie headers
    # and other mistakes your backend does.

    if ( bereq.url ~ "^/rest/V1/readbook" && beresp.status == 200) {
        unset beresp.http.set-cookie;
        set beresp.ttl = 90s;
        set beresp.http.Cache-Control = "public, max-age=90";
        return (deliver);
    }

    if ( bereq.url ~ "^/rest/V1/writebook" && beresp.status == 200 ) {
        unset beresp.http.set-cookie;
        set beresp.ttl = 90s;
        set beresp.http.Cache-Control = "public, max-age=90";
        return (deliver);
    }
    
    if ( bereq.url ~ "^/rest/V1/deletebook" && beresp.status == 200) {
        unset beresp.http.set-cookie;
        set beresp.ttl = 90s;
        set beresp.http.Cache-Control = "public, max-age=90";
        return (deliver);
    }
    
    if ( bereq.url ~ "^/rest/V1/addbook" && beresp.status == 200) {
        unset beresp.http.set-cookie;
        set beresp.ttl = 90s;
        set beresp.http.Cache-Control = "public, max-age=90";
        return (deliver);
    }
}

sub vcl_deliver {

    # Happens when we have all the pieces we need, and are about to send the
    # response to the client.
    #
    # You can do accounting or modifying the final object here.
    # Insert Diagnostic header to show Hit or Miss
    if (obj.hits > 0) {
        set resp.http.X-Cache = "HIT";
        set resp.http.X-Cache-Hits = obj.hits;
    }
    else {
        set resp.http.X-Cache = "MISS";
    }
}