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29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
99 lines
2.1 KiB
Nix
99 lines
2.1 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.memcached;
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memcached = pkgs.memcached;
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in
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{
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###### interface
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options = {
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services.memcached = {
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enable = mkOption {
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default = false;
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description = "
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Whether to enable Memcached.
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";
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};
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user = mkOption {
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default = "memcached";
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description = "The user to run Memcached as";
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};
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listen = mkOption {
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default = "127.0.0.1";
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description = "The IP address to bind to";
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};
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port = mkOption {
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default = 11211;
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description = "The port to bind to";
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};
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socket = mkOption {
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default = "";
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description = "Unix socket path to listen on. Setting this will disable network support";
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example = "/var/run/memcached";
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};
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maxMemory = mkOption {
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default = 64;
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description = "The maximum amount of memory to use for storage, in megabytes.";
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};
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maxConnections = mkOption {
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default = 1024;
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description = "The maximum number of simultaneous connections";
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};
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extraOptions = mkOption {
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default = [];
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description = "A list of extra options that will be added as a suffix when running memcached";
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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.memcached.enable {
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users.extraUsers.memcached =
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{ name = cfg.user;
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uid = config.ids.uids.memcached;
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description = "Memcached server user";
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};
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environment.systemPackages = [ memcached ];
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systemd.services.memcached =
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{ description = "Memcached 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 =
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let
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networking = if cfg.socket != ""
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then "-s ${cfg.socket}"
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else "-l ${cfg.listen} -p ${toString cfg.port}";
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in "${memcached}/bin/memcached ${networking} -m ${toString cfg.maxMemory} -c ${toString cfg.maxConnections} ${concatStringsSep " " cfg.extraOptions}";
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User = cfg.user;
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};
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};
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};
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}
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