2018-12-03 08:20:14 +00:00
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{ pkgs, config, lib, ... }:
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2018-11-20 23:03:49 +00:00
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# fork of https://gist.github.com/rycee/f495fc6cc4130f155e8b670609a1e57b
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# related: https://github.com/nh2/nix-binary-cache-proxy
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with lib;
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let
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cfg = config.krebs.cachecache;
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nginxCfg = config.services.nginx;
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cacheFallbackConfig = {
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proxyPass = "$upstream_endpoint";
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extraConfig = ''
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# Default is HTTP/1, keepalive is only enabled in HTTP/1.1.
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proxy_http_version 1.1;
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# Remove the Connection header if the client sends it, it could
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# be "close" to close a keepalive connection
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proxy_set_header Connection "";
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# Needed for CloudFront.
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proxy_ssl_server_name on;
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proxy_set_header Host $proxy_host;
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proxy_cache nix_cache_cache;
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proxy_cache_valid 200 302 60m;
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proxy_cache_valid 404 1m;
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expires max;
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add_header Cache-Control $nix_cache_cache_header always;
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'';
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};
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in
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{
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options = {
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krebs.cachecache = {
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enable = mkEnableOption "Nix binary cache cache";
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virtualHost = mkOption {
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type = types.str;
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default = "nix-cache";
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description = ''
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Name of the nginx virtualhost to use and setup. If null, do
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not setup any virtualhost.
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'';
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};
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enableSSL = mkOption {
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type = types.bool;
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default = true;
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description = ''
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enable SSL via letsencrypt. Requires working dns resolution and open
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internet tls port.
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'';
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};
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resolver = mkOption {
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type = types.str;
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description = "Address of DNS resolver.";
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default = "8.8.8.8 ipv6=off";
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example = "127.0.0.1 ipv6=off";
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};
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cacheDir = mkOption {
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type = types.str;
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default = "/var/cache/nix-cache-cache";
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description = ''
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Where nginx should store cached data.
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'';
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};
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2018-12-03 08:20:14 +00:00
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indexFile = mkOption {
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type = types.path;
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default = pkgs.writeText "myindex" "<html>hello world</html>";
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description = ''
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Path to index.html file.
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'';
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};
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2018-11-20 23:03:49 +00:00
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maxSize = mkOption {
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type = types.str;
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default = "50g";
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description = "Maximum cache size.";
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};
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};
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};
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2018-11-21 03:10:07 +00:00
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config = mkIf cfg.enable {
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2018-11-20 23:03:49 +00:00
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networking.firewall.allowedTCPPorts = [ 80 443 ];
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systemd.services.nginx.preStart = ''
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mkdir -p ${cfg.cacheDir} /srv/www/nix-cache-cache
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chmod 700 ${cfg.cacheDir} /srv/www/nix-cache-cache
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2018-12-03 08:20:14 +00:00
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ln -fs ${cfg.indexFile} /srv/www/nix-cache-cache/index.html
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2018-11-20 23:03:49 +00:00
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chown ${nginxCfg.user}:${nginxCfg.group} \
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${cfg.cacheDir} /srv/www/nix-cache-cache
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'';
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services.nginx = {
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enable = true;
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appendHttpConfig = ''
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proxy_cache_path ${cfg.cacheDir}
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levels=1:2
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keys_zone=nix_cache_cache:100m
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max_size=${cfg.maxSize}
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inactive=365d
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use_temp_path=off;
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# Cache only success status codes; in particular we don't want
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# to cache 404s. See https://serverfault.com/a/690258/128321.
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map $status $nix_cache_cache_header {
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200 "public";
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302 "public";
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default "no-cache";
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}
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'';
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virtualHosts.${cfg.virtualHost} = {
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addSSL = cfg.enableSSL;
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enableACME = cfg.enableSSL;
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extraConfig = ''
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# Using a variable for the upstream endpoint to ensure that it is
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# resolved at runtime as opposed to once when the config file is loaded
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# and then cached forever (we don't want that):
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# see https://tenzer.dk/nginx-with-dynamic-upstreams/
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# This fixes errors like
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#
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# nginx: [emerg] host not found in upstream "upstream.example.com"
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#
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# when the upstream host is not reachable for a short time when
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# nginx is started.
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resolver ${cfg.resolver} valid=10s;
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set $upstream_endpoint https://cache.nixos.org;
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'';
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locations."/" =
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{
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root = "/srv/www/nix-cache-cache";
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2018-12-03 08:20:14 +00:00
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index = "index.html";
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2018-11-20 23:03:49 +00:00
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extraConfig = ''
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expires max;
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add_header Cache-Control $nix_cache_cache_header always;
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# Ask the upstream server if a file isn't available
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# locally.
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error_page 404 = @fallback;
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# Don't bother logging the above 404.
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log_not_found off;
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'';
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};
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locations."@fallback" = cacheFallbackConfig;
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# We always want to copy cache.nixos.org's nix-cache-info
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# file, and ignore our own, because `nix-push` by default
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# generates one without `Priority` field, and thus that file
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# by default has priority 50 (compared to cache.nixos.org's
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# `Priority: 40`), which will make download clients prefer
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# `cache.nixos.org` over our binary cache.
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locations."= /nix-cache-info" = cacheFallbackConfig;
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};
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};
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};
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}
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