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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.longview;
runDir = "/run/longview";
configsDir = "${runDir}/longview.d";
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;
default = "";
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/.
Warning: this secret is stored in the world-readable Nix store!
Use <option>apiKeyFile</option> instead.
'';
};
apiKeyFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/keys/longview-api-key";
description = ''
A file containing the Longview API key.
To get this, look in Longview settings which
are found at https://manager.linode.com/longview/.
<option>apiKeyFile</option> takes precedence over <option>apiKey</option>.
'';
};
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. This user does not need to have been granted
any extra privileges.
'';
};
mysqlPassword = mkOption {
type = types.str;
default = "";
description = ''
The password corresponding to <option>mysqlUser</option>.
Warning: this is stored in cleartext in the Nix store!
Use <option>mysqlPasswordFile</option> instead.
'';
};
mysqlPasswordFile = mkOption {
type = types.nullOr types.path;
default = null;
example = "/run/keys/dbpassword";
description = ''
A file containing the password corresponding to <option>mysqlUser</option>.
'';
};
};
};
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 $MAINPID";
serviceConfig.PIDFile = "${runDir}/longview.pid";
serviceConfig.ExecStart = "${pkgs.longview}/bin/longview";
preStart = ''
umask 077
mkdir -p ${configsDir}
'' + (optionalString (cfg.apiKeyFile != null) ''
cp --no-preserve=all "${cfg.apiKeyFile}" ${runDir}/longview.key
'') + (optionalString (cfg.apacheStatusUrl != "") ''
cat > ${configsDir}/Apache.conf <<EOF
location ${cfg.apacheStatusUrl}?auto
EOF
'') + (optionalString (cfg.mysqlUser != "" && cfg.mysqlPasswordFile != null) ''
cat > ${configsDir}/MySQL.conf <<EOF
username ${cfg.mysqlUser}
password `head -n1 "${cfg.mysqlPasswordFile}"`
EOF
'') + (optionalString (cfg.nginxStatusUrl != "") ''
cat > ${configsDir}/Nginx.conf <<EOF
location ${cfg.nginxStatusUrl}
EOF
'');
};
warnings = let warn = k: optional (cfg.${k} != "")
"config.services.longview.${k} is insecure. Use ${k}File instead.";
in concatMap warn [ "apiKey" "mysqlPassword" ];
assertions = [
{ assertion = cfg.apiKeyFile != null;
message = "Longview needs an API key configured";
}
];
# Create API key file if not configured.
services.longview.apiKeyFile = mkIf (cfg.apiKey != "")
(mkDefault (toString (pkgs.writeTextFile {
name = "longview.key";
text = cfg.apiKey;
})));
# Create MySQL password file if not configured.
services.longview.mysqlPasswordFile = mkDefault (toString (pkgs.writeTextFile {
name = "mysql-password-file";
text = cfg.mysqlPassword;
}));
};
}
|