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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.longview;
pidFile = "/run/longview.pid";
apacheConf = optionalString (cfg.apacheStatusUrl != "") ''
location ${cfg.apacheStatusUrl}?auto
'';
mysqlConf = optionalString (cfg.mysqlUser != "") ''
username ${cfg.mysqlUser}
password ${cfg.mysqlPassword}
'';
nginxConf = optionalString (cfg.nginxStatusUrl != "") ''
location ${cfg.nginxStatusUrl}
'';
in
{
options = {
services.longview = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
If enabled, system metrics will be sent to Linode LongView.
'';
};
apiKey = mkOption {
type = types.str;
example = "01234567-89AB-CDEF-0123456789ABCDEF";
description = ''
Longview API key. To get this, look in Longview settings which
are found at https://manager.linode.com/longview/.
'';
};
apacheStatusUrl = mkOption {
type = types.str;
default = "";
example = "http://127.0.0.1/server-status";
description = ''
The Apache status page URL. If provided, Longview will
gather statistics from this location. This requires Apache
mod_status to be loaded and enabled.
'';
};
nginxStatusUrl = mkOption {
type = types.str;
default = "";
example = "http://127.0.0.1/nginx_status";
description = ''
The Nginx status page URL. Longview will gather statistics
from this URL. This requires the Nginx stub_status module to
be enabled and configured at the given location.
'';
};
mysqlUser = mkOption {
type = types.str;
default = "";
description = ''
The user for connecting to the MySQL database. If provided,
Longview will connect to MySQL and collect statistics about
queries, etc.
'';
};
mysqlPassword = mkOption {
type = types.str;
description = ''
The password corresponding to mysqlUser.
'';
};
};
};
config = mkIf cfg.enable {
systemd.services.longview =
{ description = "Longview Metrics Collection";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig.Type = "forking";
serviceConfig.ExecStop = "-${pkgs.coreutils}/bin/kill -TERM $MAINPID";
serviceConfig.ExecReload = "-${pkgs.coreutils}/bin/kill -HUP $MAINPID";
serviceConfig.PIDFile = pidFile;
serviceConfig.ExecStart = "${pkgs.longview}/bin/longview";
};
environment.etc."linode/longview.key" = {
mode = "0400";
text = cfg.apiKey;
};
environment.etc."linode/longview.d/Apache.conf" = {
mode = "0400";
text = apacheConf;
};
environment.etc."linode/longview.d/MySQL.conf" = {
mode = "0400";
text = mysqlConf;
};
environment.etc."linode/longview.d/Nginx.conf" = {
mode = "0400";
text = nginxConf;
};
};
}
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