Varnish VCL EU Ceph mirror

ceph-mirror.vcl

vcl 4.0;

import std;

backend download {
    .host = "download.ceph.com";
    .port = "80";
    .connect_timeout = 5s;
    .first_byte_timeout = 5s;
    .probe = {
        .timeout   = 10s;
        .interval  = 3s;
        .window    = 10;
        .threshold = 3;
        .request =
            "HEAD / HTTP/1.1"
            "Host: download.ceph.com"
            "User-Agent: Varnish-health-check"
            "Connection: close";
    }
}

backend docs {
    .host = "docs.ceph.com";
    .port = "80";
    .connect_timeout = 5s;
    .first_byte_timeout = 5s;
    .probe = {
        .timeout   = 10s;
        .interval  = 3s;
        .window    = 10;
        .threshold = 3;
        .request =
            "HEAD / HTTP/1.1"
            "Host: docs.ceph.com"
            "User-Agent: Varnish-health-check"
            "Connection: close";
    }
}

backend ceph {
    .host = "ceph.com";
    .port = "80";
    .connect_timeout = 5s;
    .first_byte_timeout = 5s;
    .probe = {
        .timeout   = 10s;
        .interval  = 3s;
        .window    = 10;
        .threshold = 3;
        .request =
            "HEAD / HTTP/1.1"
            "Host: ceph.com"
            "User-Agent: Varnish-health-check"
            "Connection: close";
    }
}

backend git {
    .host = "git.ceph.com";
    .port = "80";
    .connect_timeout = 5s;
    .first_byte_timeout = 5s;
    .probe = {
        .timeout   = 10s;
        .interval  = 3s;
        .window    = 10;
        .threshold = 3;
        .request =
            "HEAD / HTTP/1.1"
            "Host: ceph.com"
            "User-Agent: Varnish-health-check"
            "Connection: close";
    }
}

sub vcl_recv {
    if (req.url ~ "^/debian-" || req.url ~ "^/rpm-") {
        set req.backend_hint = download;
        set req.http.host = "download.ceph.com";
    } else if (req.url ~ "^/docs") {
        set req.backend_hint = docs;
        set req.http.host = "docs.ceph.com";
    } else if (req.url ~ "^/git") {
        set req.backend_hint = git;
        set req.http.host = "git.ceph.com";
    } else {
        set req.backend_hint = ceph;
        set req.http.host = "ceph.com";
    }

    if (req.http.Accept-Encoding) {
        if (req.http.Accept-Encoding ~ "gzip") {
            set req.http.Accept-Encoding = "gzip";
        } else if (req.http.Accept-Encoding ~ "deflate") {
            set req.http.Accept-Encoding = "deflate";
        } else if (req.http.Accept-Encoding ~ "identity") {
            set req.http.Accept-Encoding = "identity";
        } else {
            unset req.http.Accept-Encoding;
        }
    }

    unset req.http.Cookie;
    unset req.http.DNT;

    if (req.method != "GET" && req.method != "HEAD") {
        return (synth(400, "Bad Request"));
    }

    return (hash);
}

sub vcl_hash {
    hash_data(req.url);
    hash_data(req.http.host);
    return (lookup);
}

sub vcl_hit {
    if (obj.ttl >= 0s) {
        return (deliver);
    }

    if (std.healthy(req.backend_hint)) {
        if (obj.ttl + 10s > 0s) {
            return (deliver);
        }
    } else {
        if (obj.ttl + obj.grace > 0s) {
            return (deliver);
        }
    }

    return (fetch);
}

sub vcl_backend_fetch {
    set bereq.http.host = "ceph.com";
    return (fetch);
}

sub vcl_backend_response {
    set beresp.do_stream = true;
    set beresp.grace = 8h;

    if (beresp.status >= 500) {
        set beresp.ttl = 5s;
    } else {
        set beresp.ttl = 1h;
    }

    set beresp.http.Expires = "" + (now + beresp.ttl);

    return (deliver);
}

sub vcl_deliver {
    if (obj.hits == 0) {
        set resp.http.X-Cache-Hit = "No";
    } else {
        set resp.http.X-Cache-Hit = "Yes";
        set resp.http.X-Cache-Hits = obj.hits;
    }

    return (deliver);
}