152 lines
4.3 KiB
Nix
152 lines
4.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.dragonflydb;
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dragonflydb = pkgs.dragonflydb;
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settings =
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{
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port = cfg.port;
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dir = "/var/lib/dragonflydb";
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keys_output_limit = cfg.keysOutputLimit;
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} //
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(lib.optionalAttrs (cfg.bind != null) { bind = cfg.bind; }) //
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(lib.optionalAttrs (cfg.requirePass != null) { requirepass = cfg.requirePass; }) //
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(lib.optionalAttrs (cfg.maxMemory != null) { maxmemory = cfg.maxMemory; }) //
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(lib.optionalAttrs (cfg.memcachePort != null) { memcache_port = cfg.memcachePort; }) //
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(lib.optionalAttrs (cfg.dbNum != null) { dbnum = cfg.dbNum; }) //
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(lib.optionalAttrs (cfg.cacheMode != null) { cache_mode = cfg.cacheMode; });
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in
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{
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###### interface
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options = {
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services.dragonflydb = {
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enable = mkEnableOption "DragonflyDB";
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user = mkOption {
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type = types.str;
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default = "dragonfly";
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description = "The user to run DragonflyDB as";
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};
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port = mkOption {
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type = types.port;
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default = 6379;
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description = "The TCP port to accept connections.";
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};
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bind = mkOption {
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type = with types; nullOr str;
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default = "127.0.0.1";
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description = ''
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The IP interface to bind to.
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`null` means "all interfaces".
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'';
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};
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requirePass = mkOption {
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type = with types; nullOr str;
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default = null;
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description = "Password for database";
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example = "letmein!";
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};
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maxMemory = mkOption {
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type = with types; nullOr ints.unsigned;
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default = null;
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description = ''
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The maximum amount of memory to use for storage (in bytes).
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`null` means this will be automatically set.
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'';
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};
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memcachePort = mkOption {
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type = with types; nullOr port;
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default = null;
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description = ''
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To enable memcached compatible API on this port.
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`null` means disabled.
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'';
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};
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keysOutputLimit = mkOption {
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type = types.ints.unsigned;
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default = 8192;
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description = ''
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Maximum number of returned keys in keys command.
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`keys` is a dangerous command.
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We truncate its result to avoid blowup in memory when fetching too many keys.
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'';
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};
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dbNum = mkOption {
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type = with types; nullOr ints.unsigned;
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default = null;
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description = "Maximum number of supported databases for `select`";
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};
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cacheMode = mkOption {
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type = with types; nullOr bool;
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default = null;
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description = ''
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Once this mode is on, Dragonfly will evict items least likely to be stumbled
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upon in the future but only when it is near maxmemory limit.
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.services.dragonflydb.enable {
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users.users = optionalAttrs (cfg.user == "dragonfly") {
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dragonfly.description = "DragonflyDB server user";
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dragonfly.isSystemUser = true;
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dragonfly.group = "dragonfly";
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};
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users.groups = optionalAttrs (cfg.user == "dragonfly") { dragonfly = { }; };
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environment.systemPackages = [ dragonflydb ];
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systemd.services.dragonflydb = {
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description = "DragonflyDB server";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = {
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ExecStart = "${dragonflydb}/bin/dragonfly --alsologtostderr ${builtins.concatStringsSep " " (attrsets.mapAttrsToList (n: v: "--${n} ${strings.escapeShellArg v}") settings)}";
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User = cfg.user;
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# Filesystem access
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ReadWritePaths = [ settings.dir ];
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StateDirectory = "dragonflydb";
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StateDirectoryMode = "0700";
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# Process Properties
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LimitMEMLOCK = "infinity";
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# Caps
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CapabilityBoundingSet = "";
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NoNewPrivileges = true;
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# Sandboxing
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ProtectSystem = "strict";
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ProtectHome = true;
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PrivateTmp = true;
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PrivateDevices = true;
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ProtectKernelTunables = true;
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ProtectKernelModules = true;
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ProtectControlGroups = true;
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LockPersonality = true;
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RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
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RestrictRealtime = true;
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PrivateMounts = true;
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MemoryDenyWriteExecute = true;
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};
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};
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};
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}
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