ae359d1ef2
Fixes issues described in #208242 for this part of the nixpkgs tree. There are no behavioral changes in this, it only adjusts the code so that it is easier to understand.
92 lines
2.7 KiB
Nix
92 lines
2.7 KiB
Nix
{ config, lib, pkgs, options, ... }:
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let
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cfg = config.services.prometheus.exporters.postgres;
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inherit (lib)
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mkOption
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types
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mkIf
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mkForce
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concatStringsSep
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;
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in
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{
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port = 9187;
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extraOpts = {
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telemetryPath = mkOption {
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type = types.str;
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default = "/metrics";
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description = ''
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Path under which to expose metrics.
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'';
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};
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dataSourceName = mkOption {
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type = types.str;
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default = "user=postgres database=postgres host=/run/postgresql sslmode=disable";
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example = "postgresql://username:password@localhost:5432/postgres?sslmode=disable";
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description = ''
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Accepts PostgreSQL URI form and key=value form arguments.
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'';
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};
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runAsLocalSuperUser = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to run the exporter as the local 'postgres' super user.
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'';
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};
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# TODO perhaps LoadCredential would be more appropriate
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environmentFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/root/prometheus-postgres-exporter.env";
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description = ''
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Environment file as defined in {manpage}`systemd.exec(5)`.
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Secrets may be passed to the service without adding them to the
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world-readable Nix store, by specifying placeholder variables as
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the option value in Nix and setting these variables accordingly in the
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environment file.
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Environment variables from this file will be interpolated into the
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config file using envsubst with this syntax:
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`$ENVIRONMENT ''${VARIABLE}`
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The main use is to set the DATA_SOURCE_NAME that contains the
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postgres password
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note that contents from this file will override dataSourceName
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if you have set it from nix.
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```
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# Content of the environment file
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DATA_SOURCE_NAME=postgresql://username:password@localhost:5432/postgres?sslmode=disable
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```
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Note that this file needs to be available on the host on which
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this exporter is running.
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'';
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};
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};
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serviceOpts = {
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environment.DATA_SOURCE_NAME = cfg.dataSourceName;
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serviceConfig = {
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DynamicUser = false;
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User = mkIf cfg.runAsLocalSuperUser (mkForce "postgres");
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EnvironmentFile = mkIf (cfg.environmentFile != null) [ cfg.environmentFile ];
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ExecStart = ''
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${pkgs.prometheus-postgres-exporter}/bin/postgres_exporter \
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--web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
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--web.telemetry-path ${cfg.telemetryPath} \
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${concatStringsSep " \\\n " cfg.extraFlags}
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'';
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RestrictAddressFamilies = [
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# Need AF_UNIX to collect data
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"AF_UNIX"
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];
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};
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};
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}
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