From 2b68541e297fd6fcb67a117c7d816dbcca9e8c64 Mon Sep 17 00:00:00 2001
From: lassulus <lass@lassul.us>
Date: Tue, 7 Feb 2017 17:09:39 +0100
Subject: l 3 kapacitor: use extraConfig & start as user

---
 lass/3modules/kapacitor.nix | 188 +++++++++++++++++++++++++-------------------
 1 file changed, 109 insertions(+), 79 deletions(-)

diff --git a/lass/3modules/kapacitor.nix b/lass/3modules/kapacitor.nix
index 299a56d92..092890814 100644
--- a/lass/3modules/kapacitor.nix
+++ b/lass/3modules/kapacitor.nix
@@ -1,7 +1,7 @@
 { config, lib, pkgs, ... }:
 
 with builtins;
-with lib;
+with import <stockholm/lib>;
 
 let
   cfg = config.lass.kapacitor;
@@ -11,6 +11,71 @@ let
     config = mkIf cfg.enable imp;
   };
 
+  configOptions = recursiveUpdate {
+    hostname = "localhost";
+    data_dir = cfg.dataDir;
+    http = {
+      bind-address = ":9092";
+      auth-enabled = false;
+      log-enabled = false;
+      gtgwrite-tracing = false;
+      pprof-enabled = false;
+      https-enabled = false;
+      https-certificate = "/etc/ssl/kapacitor.pem";
+      shutdown-timeout = "10s";
+      shared-secret = "";
+    };
+
+    replay ={
+      dir = "${cfg.dataDir}/replay";
+    };
+
+    storage = {
+      boltdb = "${cfg.dataDir}/kapacitor.db";
+    };
+
+    task = {
+      dir = "${cfg.dataDir}/tasks";
+      snapshot-interval = "1m0s";
+    };
+
+    influxdb = [{
+      enabled = true;
+      name = "default";
+      default = false;
+      urls = ["http://localhost:8086"];
+      username = "";
+      password = "";
+      ssl-ca = "";
+      ssl-cert = "";
+      ssl-key = "";
+      insecure-skip-verify = false;
+      timeout = "0s";
+      disable-subscriptions = false;
+      subscription-protocol = "http";
+      udp-bind = "";
+      udp-buffer = 1000;
+      udp-read-buffer = 0;
+      startup-timeout = "5m0s";
+      subscriptions-sync-interval = "1m0s";
+      influxdb.excluded-subscriptions = {
+        _kapacitor = ["autogen"];
+      };
+    }];
+
+    logging = {
+      file = "STDERR";
+      level = "INFO";
+    };
+
+    deadman = {
+      interval = "10s";
+      id = "{{ .Group }}:NODE_NAME for task '{{ .TaskName }}'";
+      message = "{{ .ID }} is {{ if eq .Level \"OK\" }}alive{{ else }}dead{{ end }}: {{ index .Fields \"emitted\" | printf \"%0.3f\" }} points/INTERVAL.";
+      global = false;
+    };
+  } cfg.extraConfig;
+
   api = {
     enable = mkEnableOption "kapacitor";
     dataDir = mkOption {
@@ -18,90 +83,54 @@ let
       default = "/var/lib/kapacitor";
     };
     user = mkOption {
-      type = types.str;
-      default = "kapacitor";
+      type = types.user;
+      default = {
+        name = "kapacitor";
+        home = cfg.dataDir;
+      };
     };
-    logLevel = mkOption {
-      type = types.enum ["DEBUG" "INFO" "WARN" "ERROR" "OFF"];
-      default = "INFO";
+    group = mkOption {
+      type = types.group;
+      default = {
+        name = "kapacitor";
+      };
     };
-    alarms = mkOption {
-      type = with types; attrsOf str;
+    extraConfig = mkOption {
+      type = types.attrs;
       default = {};
     };
-    check_db = mkOption {
-      type = types.str;
-      default = "all_data";
-    };
-    config = mkOption {
-      type = types.str;
-      #TODO: find a good default
-      default = ''
-        hostname = "localhost"
-        data_dir = "${cfg.dataDir}"
-
-        [http]
-          bind-address = ":9092"
-          auth-enabled = false
-          log-enabled = true
-          write-tracing = false
-          pprof-enabled = false
-          https-enabled = false
-          https-certificate = "/etc/ssl/kapacitor.pem"
-          shutdown-timeout = "10s"
-          shared-secret = ""
-
-        [replay]
-          dir = "${cfg.dataDir}/replay"
-
-        [storage]
-          boltdb = "${cfg.dataDir}/kapacitor.db"
-
-        [task]
-          dir = "${cfg.dataDir}/tasks"
-          snapshot-interval = "1m0s"
-
-        [[influxdb]]
-          enabled = true
-          name = "default"
-          default = false
-          urls = ["http://localhost:8086"]
-          username = ""
-          password = ""
-          ssl-ca = ""
-          ssl-cert = ""
-          ssl-key = ""
-          insecure-skip-verify = false
-          timeout = "0s"
-          disable-subscriptions = false
-          subscription-protocol = "http"
-          udp-bind = ""
-          udp-buffer = 1000
-          udp-read-buffer = 0
-          startup-timeout = "5m0s"
-          subscriptions-sync-interval = "1m0s"
-          [influxdb.subscriptions]
-          [influxdb.excluded-subscriptions]
-            _kapacitor = ["autogen"]
-
-        [logging]
-          file = "STDERR"
-          level = "${cfg.logLevel}"
-
-        [deadman]
-          interval = "10s"
-          threshold = 0.0
-          id = "{{ .Group }}:NODE_NAME for task '{{ .TaskName }}'"
-          message = "{{ .ID }} is {{ if eq .Level \"OK\" }}alive{{ else }}dead{{ end }}: {{ index .Fields \"emitted\" | printf \"%0.3f\" }} points/INTERVAL."
-          global = false
-      '';
-      description = "configuration kapacitor is started with";
+    alarms = mkOption {
+      type = with types; attrsOf (submodule {
+        options = {
+          database = mkOption {
+            type = str;
+          };
+          text = mkOption {
+            type = str;
+          };
+        };
+      });
+      default = {};
     };
   };
 
-  configFile = pkgs.writeText "kapacitor.conf" cfg.config;
+  configFile = pkgs.runCommand "kapacitor.toml" {} ''
+    ${pkgs.remarshal}/bin/remarshal -if json -of toml \
+      < ${pkgs.writeText "kapacitor.json" (builtins.toJSON configOptions)} \
+      > $out
+  '';
 
   imp = {
+    users = {
+      groups.${cfg.group.name} = {
+        inherit (cfg.group) name gid;
+      };
+      users.${cfg.user.name} = {
+        inherit (cfg.user) home name uid;
+        createHome = true;
+        group = cfg.group.name;
+      };
+    };
 
     systemd.services.kapacitor = {
       description = "kapacitor";
@@ -112,6 +141,7 @@ let
 
       serviceConfig = {
         Restart = "always";
+        User = cfg.user.name;
         ExecStart = "${pkgs.kapacitor}/bin/kapacitord -config ${configFile}";
       };
     };
@@ -125,13 +155,14 @@ let
 
       serviceConfig = {
         Type = "oneshot";
+        User = cfg.user.name;
         ExecStart = pkgs.writeDash "add_alarms" ''
           ${pkgs.kapacitor}/bin/kapacitor delete tasks \*
           ${concatStrings (mapAttrsToList (name: alarm: ''
             ${pkgs.kapacitor}/bin/kapacitor define ${name} \
               -type batch \
-              -tick ${pkgs.writeText "${name}.tick" alarm} \
-              -dbrp ${cfg.check_db}.default
+              -tick ${pkgs.writeText "${name}.tick" alarm.text} \
+              -dbrp ${alarm.database}.default
             ${pkgs.kapacitor}/bin/kapacitor enable ${name}
           '') cfg.alarms)}
         '';
@@ -139,5 +170,4 @@ let
     };
 
   };
-
 in out
-- 
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