vcl 4.0;
import directors;
# import tcp;

backend ott_live {
    .host = "xxx.xxx.xxx.100";
    .port = "80";
    .probe = {
      .url = "/HealthCheck.txt";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_live2 {
    .host = "xxx.xxx.xxx.102";
    .port = "80";
    .probe = {
      .url = "/HealthCheck.txt";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_live2_3 {
    .host = "xxx.xxx.xxx.21";
    .port = "80";
    .probe = {
      .url = "/HealthCheck.txt";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_live3 {
    .host = "xxx.xxx.xxx.21";
    .port = "80";
    .probe = {
      .url = "/HealthCheck.txt";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_abr_live1_1 {
    .host = "xxx.xxx.xxx.70";
    .port = "80";
    .probe = {
      .url = "/health";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_abr_live1_2 {
    .host = "xxx.xxx.xxx.71";
    .port = "80";
    .probe = {
      .url = "/health";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_abr_live1_3 {
    .host = "xxx.xxx.xxx.72";
    .port = "80";
    .probe = {
      .url = "/health";
      .timeout = 5s;
      .interval = 1s;
      .window = 5;
      .threshold = 4;
    }
}

backend ott_nimble {
    .host = "xxx.xxx.xxx.16";
    .port = "8081";

}

sub vcl_init {
    new live2_rr = directors.round_robin();
    live2_rr.add_backend(ott_live2);
    live2_rr.add_backend(ott_live2_3);
}

sub vcl_init {
    new abr_live_rr = directors.round_robin();
    abr_live_rr.add_backend(ott_abr_live1_1);
    abr_live_rr.add_backend(ott_abr_live1_2);
    abr_live_rr.add_backend(ott_abr_live1_3);
}

sub vcl_hit {
  set req.http.X-Varnish-TTL = obj.ttl;
  set req.http.X-Varnish-Cache = "hit";
}
sub vcl_miss {
  set req.http.X-Varnish-TTL = 0;
  set req.http.X-Varnish-Cache = "miss";
}

sub vcl_pass {
  set req.http.X-Varnish-TTL = 0;
  set req.http.X-Varnish-Cache = "pass";
}

sub vcl_recv {
  if (req.http.x-forwarded-for) {
    set req.http.X-Forwarded-For = req.http.X-Forwarded-For;
  }
  else {
    set req.http.X-Forwarded-For = client.ip;
  }

  if (req.http.host ~ "xxxx.com") {
    set req.backend_hint = ott_live;
  }
  elsif (req.http.host ~ "xxxx1.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }
  elsif (req.http.host ~ "xxxx2.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }
  elsif (req.http.host ~ "xxxx3.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }

  elsif (req.http.host ~ "xxxx4.com") {
    set req.backend_hint = abr_live_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }

  elsif (req.http.host ~ "xxxx5.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }

  elsif (req.http.host ~ "xxxx6.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }
  elsif (req.http.host ~ "xxxx7.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }
  elsif (req.http.host ~ "xxxx8.com") {
    set req.backend_hint = live2_rr.backend();
    unset req.http.If-Modified-Since;
    unset req.http.If-None-Match;
  }
  elsif (req.http.host ~ "xxxx9.como") {
    set req.backend_hint = live2_rr.backend();
  }
  elsif (req.http.host ~ "xxxx10.com") {
    set req.backend_hint = ott_live3;
  }
  elsif (req.http.host ~ "xxxx11.com") {
    set req.backend_hint = ott_nimble;
  }
  elsif (req.http.host ~ "xxxx12.com") {
    set req.backend_hint = ott_nimble;
  }
  else {
    return (synth(750, "Backend not found"));
  }

  # Not really needed, but will keep for sake of confirmation
  if (req.url ~ "^/flu" || req.url ~ "\.ts$" || req.url ~ "Seg(\d+)-Frag(\d+)$" || req.url ~ "Fragments" ) {
    unset req.http.cookie;
  }
}

sub vcl_synth {
  if (resp.status == 750){
    set resp.status = 403;
    set resp.http.Content-Type = "text/html; charset=utf-8";
    synthetic( {"
      <html>
        <head>
          <title>"} + resp.status + {" wrong resource requested</title>
        </head>
        <body>
          <h1>Error "} + resp.status + {" wrong resource requested</h1>
          <!--<img src=beacon750.png width=1px height=1px>-->
        </body>
      </html> "} );
    return (deliver);
  }
}

sub vcl_backend_response {
  if (bereq.url ~ "^/flu" || bereq.url ~ "\.ts$" || bereq.url ~ "Seg(\d+)-Frag(\d+)$" || bereq.url ~ "Fragments") {
    if (beresp.status == 200) {
      unset beresp.http.set-cookie;
      unset beresp.http.Cache-Control;
      #unset beresp.http.resp.X-USP;
      #unset beresp.http.resp.X-USP-Info1;
      #unset beresp.http.resp.X-USP-Info2;
      unset beresp.http.Expires;
      set beresp.ttl = 120m;
      set beresp.http.Expires = "" + (now + beresp.ttl);
      return (deliver);
    }
    elsif (beresp.status == 412) {
      set beresp.ttl = 256ms;
      #set beresp.uncacheable = true;
      return (deliver);
    }
    elsif (beresp.status == 404) {
      set beresp.ttl = 0s;
      set beresp.uncacheable = true;
      return (deliver);
    }
    elsif (beresp.status == 304) {
      set beresp.ttl = 0s;
      set beresp.uncacheable = true;
      return (deliver);
    }
    elsif (beresp.status == 503) {
      set beresp.ttl = 0s;
      set beresp.uncacheable = true;
      return (deliver);
    }
  }

  if (bereq.url ~ "(\.f4m|/Manifest|\.mpd|bootstrap)$") {
    set beresp.http.Cache-Control = "max-age=1";
    set beresp.ttl = 1s;
  }
  elsif (bereq.url ~ "(\.m3u8)$") {
    set beresp.http.Cache-Control = "max-age=2";
    set beresp.ttl = 2s;
  }
}

sub vcl_deliver {
  set resp.http.X-TTL = req.http.X-Varnish-TTL;
  set resp.http.X-Cache = req.http.X-Varnish-Cache;
  unset resp.http.X-USP;
  unset resp.http.X-USP-Info1;
  unset resp.http.X-USP-Info2;
  unset resp.http.Via;
  unset resp.http.X-Varnish;
  unset resp.http.Age;
  set resp.http.X-Served-By = server.hostname;
  set resp.http.Server = "XXX Streaming Service";
}