From 0edab7ed648b2bd504030a37dcbd29d7793f96b7 Mon Sep 17 00:00:00 2001
From: Colin <colin@uninsane.org>
Date: Sun, 20 Aug 2023 05:00:35 +0000
Subject: [PATCH] lemmy: port to new pict-rs and enable video

---
 hosts/by-name/servo/services/lemmy.nix | 41 ++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/hosts/by-name/servo/services/lemmy.nix b/hosts/by-name/servo/services/lemmy.nix
index 1e9e931f..e91cf71f 100644
--- a/hosts/by-name/servo/services/lemmy.nix
+++ b/hosts/by-name/servo/services/lemmy.nix
@@ -3,13 +3,23 @@
 # - <repo:LemmyNet/lemmy:docker/nginx.conf>
 # - <repo:LemmyNet/lemmy-ansible:templates/nginx.conf>
 
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 let
   inherit (builtins) toString;
   inherit (lib) mkForce;
   uiPort = 1234;  # default ui port is 1234
   backendPort = 8536; # default backend port is 8536
-  # - i guess the "backend" port is used for federation?
+  #^ i guess the "backend" port is used for federation?
+  pict-rs = pkgs.pict-rs.overrideAttrs (upstream: {
+    # as of v 0.4.2, all non-GIF video is forcibly transcoded.
+    # that breaks lemmy, because of the request latency.
+    # and it eats up hella CPU.
+    # pict-rs is iffy around video altogether: mp4 seems the best supported.
+    postPatch = (upstream.postPatch or "") + ''
+      substituteInPlace src/validate.rs \
+        --replace 'if transcode_options.needs_reencode() {' 'if false {'
+    '';
+  });
 in {
   services.lemmy = {
     enable = true;
@@ -56,4 +66,31 @@ in {
   };
 
   sane.dns.zones."uninsane.org".inet.CNAME."lemmy" = "native";
+
+  #v DO NOT REMOVE: defaults to 0.3, instead of latest, so always need to explicitly set this.
+  services.pict-rs.package = pict-rs;
+  # pict-rs configuration is applied in this order:
+  # - via toml
+  # - via env vars (overrides everything above)
+  # - via CLI flags (overrides everything above)
+  # some of the CLI flags have defaults, making it the only actual way to configure certain things even when docs claim otherwise.
+  systemd.services.pict-rs.environment = {
+    # lemmy's media-hosting service
+    # docs: <https://git.asonix.dog/asonix/pict-rs/src/branch/main/pict-rs.toml>
+
+    # PICTRS__MEDIA__VIDEO__ENABLE = "1";  # enable webm and mp4
+    # PICTRS__MEDIA__VIDEO__ALLOW_AUDIO = "1";
+    # PICTRS__MEDIA__VIDEO__MAX_FRAME_COUNT = builtins.toString (30*60*60);  # ~ 1 hr
+    # PICTRS__REPO__CACHE_CAPACITY = builtins.toString (128*1024*1024);  # default is 64 MiB, but RAM is cheap here
+
+    # PICTRS__MEDIA__SKIP_VALIDATE_IMPORTS = "1";  # to disable media validation
+    # PICTRS__OLD_DB__PATH = config.services.pict-rs.dataDir;  #< needed only for 0.3 -> 0.4 migration
+  };
+  # CLI args: <https://git.asonix.dog/asonix/pict-rs#user-content-running>
+  systemd.services.pict-rs.serviceConfig.ExecStart = lib.mkForce (lib.concatStringsSep " " [
+    "${lib.getBin pict-rs}/bin/pict-rs run"
+    "--media-max-frame-count" (builtins.toString (30*60*60))
+    "--media-process-timeout 120"
+    "--media-enable-full-video true"  # allow audio
+  ]);
 }