95 lines
2.6 KiB
Nix
95 lines
2.6 KiB
Nix
# List of features I want this module to eventually have
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# TODO: Automatic port allocation
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# TODO: Making it possible to conveniently isolate services (running them in NixOS containers)
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# TODO: Handling specializations
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# TODO: Convenient http handling
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# TODO: Automatic backup
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{ config, lib, ... }:
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let
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serviceModule =
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{ config, ... }:
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{
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options = {
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host = lib.mkOption {
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type = lib.types.str;
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};
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ports = lib.mkOption {
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type = with lib.types; listOf port;
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default = [ ];
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};
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hosts = lib.mkOption {
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type = with lib.types; listOf str;
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default = [ config.host ];
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};
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module = lib.mkOption {
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type = lib.types.deferredModule;
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default = { };
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};
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hostModule = lib.mkOption {
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type = with lib.types; attrsOf deferredModule;
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default = { };
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};
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};
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};
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moduleToHostConfigs =
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cfg:
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lib.genAttrs cfg.hosts (host: {
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imports = [
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cfg.module
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(cfg.hostModule.${host} or { })
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];
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});
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maybeGetPreviousConfigs = acc: host: (acc.${host} or { imports = [ ]; }).imports;
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in
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{
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_file = ./services.nix;
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options = {
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services = lib.mkOption {
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type = with lib.types; attrsOf (submodule serviceModule);
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default = { };
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};
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__extraHostConfigs = lib.mkOption {
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type = with lib.types; attrsOf deferredModule;
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readOnly = true;
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};
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};
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config.__extraHostConfigs =
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let
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duplicatePorts = lib.pipe config.services [
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lib.attrValues
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(map (cfg: cfg.ports))
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lib.flatten
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(lib.groupBy' (cnt: _: cnt + 1) 0 toString)
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(lib.filterAttrs (_: cnt: cnt > 1))
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lib.attrNames
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];
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assertMsg =
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let
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plural = lib.length duplicatePorts > 1;
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in
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"\nBad service config:\nThe following port${if plural then "s" else ""} ${
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if plural then "were" else "was"
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} declared multiple times: ${lib.concatStringsSep ", " duplicatePorts}";
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# Here I collect all the services.<name>.config into a flat
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# __extraHostConfigs.<host>.imports = [
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# ...
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# ]
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# so that I can easily import them in hosts/default.nix
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hostConfigs = lib.pipe config.services [
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lib.attrValues
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(lib.foldl' (
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acc: cfg:
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acc
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// lib.mapAttrs (host: c: {
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imports = c.imports ++ (maybeGetPreviousConfigs acc host);
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}) (moduleToHostConfigs cfg)
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) { })
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];
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in
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if duplicatePorts != [ ] then throw assertMsg else hostConfigs;
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}
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