From dce39b836a0fd6e37ab2499c2e0e232572c17ad6 Mon Sep 17 00:00:00 2001
From: Brian Picciano <mediocregopher@gmail.com>
Date: Fri, 6 Aug 2021 20:34:18 -0600
Subject: add redis process, put circus in charge of process management

---
 default.nix | 65 +++++++++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 53 insertions(+), 12 deletions(-)

(limited to 'default.nix')

diff --git a/default.nix b/default.nix
index 8e634bf..a713f8a 100644
--- a/default.nix
+++ b/default.nix
@@ -3,11 +3,60 @@ let
     pkgs = utils.pkgs;
     system = utils.system;
 in
-    rec {
-        srv = (import ./srv).build;
-        static = (import ./static).build;
+    {config ? ./config.nix}: rec {
         config = (import ./config.nix);
 
+        static = (import ./static).build;
+
+        srv = (import ./srv).build;
+        srvBin = pkgs.writeScript "mediocregopher-mediocre-blog-srvBin" ''
+            #!/bin/sh
+            exec ${srv}/bin/mediocre-blog \
+                -pow-secret   "${config.powSecret}" \
+                -ml-smtp-addr "${config.mlSMTPAddr}" \
+                -ml-smtp-auth "${config.mlSMTPAuth}" \
+                -data-dir     "${config.dataDir}" \
+                -public-url   "${config.publicURL}" \
+                -static-dir   "${static}" \
+                -listen-proto "${config.listenProto}" \
+                -listen-addr  "${config.listenAddr}"
+        '';
+
+        redisCfg = pkgs.writeText "mediocregopher-mediocre-blog-redisCfg" ''
+            port 0
+            unixsocket ${config.redisListenPath}
+            daemonize no
+            loglevel notice
+            logfile ""
+            appendonly yes
+            appendfilename "appendonly.aof"
+            dir ${config.dataDir}/redis
+        '';
+
+        redisBin = pkgs.writeScript "mediocregopher-mediocre-blog-redisBin" ''
+            #!/bin/sh
+            mkdir -p ${config.dataDir}/redis
+            exec ${pkgs.redis}/bin/redis-server ${redisCfg}
+        '';
+
+        circusCfg = pkgs.writeText "mediocregopher-mediocre-blog-circusCfg" ''
+            [circus]
+            endpoint = tcp://127.0.0.1:0
+            pubsub_endpoint = tcp://127.0.0.1:0
+
+            [watcher:srv]
+            cmd = ${srvBin}
+            numprocesses = 1
+
+            [watcher:redis]
+            cmd = ${redisBin}
+            numprocesses = 1
+        '';
+
+        circusBin = pkgs.writeScript "mediocregopher-mediocre-blog-circusBin" ''
+            exec ${pkgs.circus}/bin/circusd ${circusCfg}
+        '';
+
         service = pkgs.writeText "mediocregopher-mediocre-blog" ''
             [Unit]
             Description=mediocregopher mediocre blog
@@ -18,15 +67,7 @@ in
             Restart=always
             RestartSec=1s
             User=mediocregopher
-            ExecStart=${srv}/bin/mediocre-blog \
-                -pow-secret   "${config.powSecret}" \
-                -ml-smtp-addr "${config.mlSMTPAddr}" \
-                -ml-smtp-auth "${config.mlSMTPAuth}" \
-                -data-dir     "${config.dataDir}" \
-                -public-url   "${config.publicURL}" \
-                -static-dir   "${static}" \
-                -listen-proto "${config.listenProto}" \
-                -listen-addr  "${config.listenAddr}"
+            ExecStart=${circusBin}
 
             [Install]
             WantedBy=multi-user.target
-- 
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