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{ config, lib, pkgs, options }:
let
cfg = config.services.prometheus.exporters.rtl_433;
in
{
port = 9550;
extraOpts = let
mkMatcherOptionType = field: description: with lib.types;
listOf (submodule {
options = {
name = lib.mkOption {
type = str;
description = "Name to match.";
};
"${field}" = lib.mkOption {
type = int;
inherit description;
};
location = lib.mkOption {
type = str;
description = "Location to match.";
};
};
});
in
{
rtl433Flags = lib.mkOption {
type = lib.types.str;
default = "-C si";
example = "-C si -R 19";
description = ''
Flags passed verbatim to rtl_433 binary.
Having <literal>-C si</literal> (the default) is recommended since only Celsius temperatures are parsed.
'';
};
channels = lib.mkOption {
type = mkMatcherOptionType "channel" "Channel to match.";
default = [];
example = [
{ name = "Acurite"; channel = 6543; location = "Kitchen"; }
];
description = ''
List of channel matchers to export.
'';
};
ids = lib.mkOption {
type = mkMatcherOptionType "id" "ID to match.";
default = [];
example = [
{ name = "Nexus"; id = 1; location = "Bedroom"; }
];
description = ''
List of ID matchers to export.
'';
};
};
serviceOpts = {
serviceConfig = {
# rtl-sdr udev rules make supported USB devices +rw by plugdev.
SupplementaryGroups = "plugdev";
ExecStart = let
matchers = (map (m:
"--channel_matcher '${m.name},${toString m.channel},${m.location}'"
) cfg.channels) ++ (map (m:
"--id_matcher '${m.name},${toString m.id},${m.location}'"
) cfg.ids); in ''
${pkgs.prometheus-rtl_433-exporter}/bin/rtl_433_prometheus \
-listen ${cfg.listenAddress}:${toString cfg.port} \
-subprocess "${pkgs.rtl_433}/bin/rtl_433 -F json ${cfg.rtl433Flags}" \
${lib.concatStringsSep " \\\n " matchers} \
${lib.concatStringsSep " \\\n " cfg.extraFlags}
'';
};
};
}
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