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{ config, lib, pkgs, ... }:
# FIXME: It is wasteful to always run the service. We should run on-demand instead.
# This is usually achieved using SystemD sockets [4] but we are blocked on missing
# features in Deno [1, 5].
#
# We have to be able to listen on a socket that's already been created by binding
# an open file descriptor (or listening on stdin) [3]. This is not possible in Deno
# as it is now [1, 2, 6].
#
# Once it becomes a possibility, we should mirror the way push-notification-api works
# as of b9ed407 [8, 7].
#
# [1]: https://github.com/denoland/deno/issues/6529
# [2]: https://github.com/denoland/deno/blob/1dd1aba2448c6c8a5a0370c4066a68aca06b859b/ext/net/ops_unix.rs#L207C34-L207C34
# [3]: https://www.freedesktop.org/software/systemd/man/latest/systemd.socket.html#Description:~:text=Note%20that%20the,the%20service%20file).
# [4]: https://www.freedesktop.org/software/systemd/man/latest/systemd.socket.html#Description:~:text=Socket%20units%20may%20be%20used%20to%20implement%20on%2Ddemand%20starting%20of%20services%2C%20as%20well%20as%20parallelized%20starting%20of%20services.%20See%20the%20blog%20stories%20linked%20at%20the%20end%20for%20an%20introduction.
# [5]: https://github.com/denoland/deno/issues/14214
# [6]: https://github.com/tokio-rs/tokio/issues/5678
# [7]: https://github.com/benoitc/gunicorn/blob/660fd8d850f9424d5adcd50065e6060832a200d4/gunicorn/arbiter.py#L142-L155
# [8]: https://github.com/linnnus/push-notification-api/tree/b9ed4071a4500a26b3b348a7f5fbc549e9694562
let
cfg = config.services.hellohtml;
in
{
options.services.hellohtml = {
enable = lib.mkEnableOption "hellohtml service";
port = lib.mkOption {
description = "The port where hellohtml should listen.";
type = lib.types.port;
default = 8538;
};
};
config = lib.mkIf cfg.enable {
# Create a user for running service.
users.users.hellohtml = {
group = "hellohtml";
description = "Runs hellohtml service";
isSystemUser = true;
home = "/srv/hellohtml";
createHome = true; # Store DB here.
};
users.groups.hellohtml = { };
# Create hellohtml service.
systemd.services.hellohtml = {
description = "HelloHTML server!!!";
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
serviceConfig =
let
src = pkgs.fetchFromGitHub {
owner = "linnnus";
repo = "hellohtml";
rev = "97f00500712d8551d7bbf497ec442083c63384d0";
hash = "sha256-6nbL2B26dc83F2gSLXadyfS8etuPhhlFy9ivG5l6Tog";
};
hellohtml-vendor = pkgs.stdenv.mkDerivation {
name = "hellohtml-vendor";
nativeBuildInputs = [ pkgs.unstable.deno ];
inherit src;
buildCommand = ''
# Deno wants to create cache directories.
HOME="$(mktemp -d)"
# Thought this wasn't necessary???
cd $src
# Build directory containing offline deps + import map.
deno vendor --output=$out ./src/server.ts
'';
outputHashAlgo = "sha256";
outputHashMode = "recursive";
outputHash = "sha256-0TGLkEvJaBpI7IlTyuYRzA20Bw/TMSMz3q8wm5oPsBM";
};
hellohtml-drv = pkgs.writeShellScript "hellohtml" ''
export HELLOHTML_DB_PATH="${config.users.users.hellohtml.home}"/hello.db
export HELLOHTML_PORT=${toString cfg.port}
export HELLOHTML_BASE_DIR="${src}"
${pkgs.unstable.deno}/bin/deno run \
--allow-read=$HELLOHTML_BASE_DIR,$HELLOHTML_DB_PATH,. \
--allow-write=$HELLOHTML_DB_PATH \
--allow-net=0.0.0.0:$HELLOHTML_PORT \
--allow-env \
--no-prompt \
--unstable-kv \
--import-map=${hellohtml-vendor}/import_map.json \
--no-remote \
${src}/src/server.ts
'';
in
{
Type = "simple";
User = config.users.users.hellohtml.name;
Group = config.users.users.hellohtml.group;
ExecStart = "${hellohtml-drv}";
# Harden service
# NoNewPrivileges = "yes";
# PrivateTmp = "yes";
# PrivateDevices = "yes";
# DevicePolicy = "closed";
# ProtectControlGroups = "yes";
# ProtectKernelModules = "yes";
# ProtectKernelTunables = "yes";
# RestrictAddressFamilies = "AF_UNIX AF_INET AF_INET6 AF_NETLINK";
# RestrictNamespaces = "yes";
# RestrictRealtime = "yes";
# RestrictSUIDSGID = "yes";
# MemoryDenyWriteExecute = "yes";
# LockPersonality = "yes";
};
};
};
}
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