default.nix: filter `flake.lock` from source

- Add watchdog timeout support
- Add native journald logging support
- Add application state notifications
- Add verbosity flag

Cargo.toml

@@ -10,16 +10,23 @@ readme = "README.md"
 
 [dependencies]
 anyhow = "1.0.82"
-axum = { version = "0.6.20", features = ["macros"] }
+axum = { version = "0.7.7", features = ["macros"] }
 clap = { version = "4.4.1", features = ["derive"] }
+clap-verbosity-flag = "2.2.2"
 env_logger = "0.10.0"
 log = "0.4.20"
 mpvipc-async = { git = "https://git.pvv.ntnu.no/oysteikt/mpvipc-async.git", rev = "v0.1.0" }
+sd-notify = "0.4.3"
 serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.105"
+systemd-journal-logger = "2.2.0"
+tempfile = "3.11.0"
 tokio = { version = "1.32.0", features = ["full"] }
 tower = { version = "0.4.13", features = ["full"] }
 tower-http = { version = "0.4.3", features = ["full"] }
+utoipa = { version = "5.1.3", features = ["axum_extras"] }
+utoipa-axum = "0.1.2"
+utoipa-swagger-ui = { version = "8.0.3", features = ["axum", "vendored"] }
 
 [profile.release]
 strip = true

assets/default-mpv.conf

@@ -0,0 +1,3 @@
+[youtube]
+profile-cond=path:find('youtu%.?be')
+--ytdl-format="bestvideo[height<=?720][vcodec!~='vp0?9']+bestaudio/best"

default.nix

@@ -4,12 +4,30 @@
 , rustPlatform
 , makeWrapper
 , mpv
+, wrapped ? false
 }:
 
 rustPlatform.buildRustPackage rec {
   pname = "greg-ng";
   version = "0.1.0";
-  src = lib.cleanSource ./.;
+  src = builtins.filterSource (path: type: let
+    baseName = baseNameOf (toString path);
+  in !(lib.any (b: b) [
+      (!(lib.cleanSourceFilter path type))
+      (type == "directory" && lib.elem baseName [
+        ".direnv"
+        ".git"
+        "target"
+        "result"
+      ])
+      (type == "regular" && lib.elem baseName [
+        "flake.nix"
+        "flake.lock"
+        "default.nix"
+        "module.nix"
+        ".envrc"
+      ])
+    ])) ./.;
 
   nativeBuildInputs = [ makeWrapper ];
 
@@ -20,7 +38,7 @@ rustPlatform.buildRustPackage rec {
     };
   };
 
-  postInstall = ''
+  postInstall = lib.optionalString wrapped ''
     wrapProgram $out/bin/greg-ng \
       --prefix PATH : '${lib.makeBinPath [ mpv ]}'
   '';

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1722421184,
-        "narHash": "sha256-/DJBI6trCeVnasdjUo9pbnodCLZcFqnVZiLUfqLH4jA=",
+        "lastModified": 1729256560,
+        "narHash": "sha256-/uilDXvCIEs3C9l73JTACm4quuHUsIHcns1c+cHUJwA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "9f918d616c5321ad374ae6cb5ea89c9e04bf3e58",
+        "rev": "4c2fcb090b1f3e5b47eaa7bd33913b574a11e0a0",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1722651535,
-        "narHash": "sha256-2uRmNwxe3CO5h7PfvqXrRe8OplXaEdwhqOUtaF13rpU=",
+        "lastModified": 1729391507,
+        "narHash": "sha256-as0I9xieJUHf7kiK2a9znDsVZQTFWhM1pLivII43Gi0=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "56d83ca6f3c557647476f3720426a7615c22b860",
+        "rev": "784981a9feeba406de38c1c9a3decf966d853cca",
         "type": "github"
       },
       "original": {

flake.nix

@@ -27,16 +27,20 @@
       };
 
       rust-bin = rust-overlay.lib.mkRustBin { } pkgs.buildPackages;
-      toolchain = rust-bin.stable.latest.default;
+      toolchain = rust-bin.stable.latest.default.override {
+        extensions = [ "rust-src" "rust-analyzer" "rust-std" ];
+      };
     in f system pkgs toolchain);
   in {
     apps = forAllSystems (system: pkgs: _: {
       default = self.apps.${system}.greg-ng;
       greg-ng = let
-        package = self.packages.${system}.greg-ng;
+        package = self.packages.${system}.greg-ng-wrapped;
       in {
         type = "app";
-        program = lib.getExe package;
+        program = toString (pkgs.writeShellScript "greg-ng" ''
+          ${lib.getExe package} --mpv-socket-path /tmp/greg-ng-mpv.sock -vvvv
+        '');
       };
     });
 
@@ -51,9 +55,21 @@
       };
     });
 
+    overlays = {
+      default = self.overlays.greg-ng;
+      greg-ng = final: prev: {
+        inherit (self.packages.${prev.system}) greg-ng;
+      };
+    };
+
     packages = forAllSystems (system: pkgs: _: {
       default = self.packages.${system}.greg-ng;
       greg-ng = pkgs.callPackage ./default.nix { };
+      greg-ng-wrapped = pkgs.callPackage ./default.nix {
+        wrapped = true;
+      };
     });
+  } // {
+    nixosModules.default = ./module.nix;
   };
 }

module.nix

@@ -0,0 +1,197 @@
+{ config, pkgs, lib, ... }:
+let
+  cfg = config.services.greg-ng;
+in
+{
+  options.services.greg-ng = {
+    enable = lib.mkEnableOption "greg-ng, an mpv based media player";
+
+    package = lib.mkPackageOption pkgs "greg-ng" { };
+
+    mpvPackage = lib.mkPackageOption pkgs "mpv" { };
+
+    enableSway = lib.mkEnableOption "sway as the main window manager";
+
+    enablePipewire = lib.mkEnableOption "pipewire" // { default = true; };
+
+    logLevel = lib.mkOption {
+      type = lib.types.enum [ "quiet" "error" "warn" "info" "debug" "trace" ];
+      default = "debug";
+      description = "Log level.";
+      apply = level: {
+        "quiet" = "-q";
+        "error" = "";
+        "warn" = "-v";
+        "info" = "-vv";
+        "debug" = "-vvv";
+        "trace" = "-vvvv";
+      }.${level};
+    };
+
+    # TODO: create some better descriptions
+    settings = {
+      host = lib.mkOption {
+        type = lib.types.str;
+        default = "localhost";
+        example = "0.0.0.0";
+        description = ''
+          Which host to bind to.
+        '';
+      };
+
+      port = lib.mkOption {
+        type = lib.types.port;
+        default = 8008;
+        example = 10008;
+        description = ''
+          Which port to bind to.
+        '';
+      };
+
+      mpv-socket-path = lib.mkOption {
+        type = lib.types.str;
+        default = "%t/greg-ng-mpv.sock";
+        description = ''
+          Path to the mpv socket.
+        '';
+      };
+
+      mpv-executable-path = lib.mkOption {
+        type = lib.types.str;
+        default = lib.getExe cfg.mpvPackage;
+        defaultText = lib.literalExpression ''
+          lib.getExe config.services.greg-ng.mpvPackage
+        '';
+        description = ''
+          Path to the mpv executable.
+        '';
+      };
+
+      mpv-config-file = lib.mkOption {
+        type = with lib.types; nullOr str;
+        default = null;
+        description = ''
+          Path to the mpv config file.
+        '';
+      };
+
+      auto-start-mpv = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = ''
+          Whether to automatically start mpv.
+        '';
+      };
+
+      force-auto-start = lib.mkOption {
+        type = lib.types.bool;
+        default = true;
+        description = ''
+          Whether to force auto starting mpv.
+        '';
+      };
+    };
+  };
+
+  config = lib.mkMerge [
+    (lib.mkIf cfg.enable {
+      systemd.user.services.greg-ng = {
+        description = "greg-ng, an mpv based media player";
+        wantedBy = [ "graphical-session.target" ];
+        partOf = [ "graphical-session.target" ];
+        serviceConfig = {
+          Type = "notify";
+          ExecStart = let
+            args = lib.cli.toGNUCommandLineShell { } (cfg.settings // {
+              systemd = true;
+            });
+          in "${lib.getExe cfg.package} ${cfg.logLevel} ${args}";
+
+          Restart = "always";
+          RestartSec = 3;
+          WatchdogSec = lib.mkDefault 15;
+          TimeoutStartSec = lib.mkDefault 30;
+
+          RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
+          AmbientCapabilities = [ "" ];
+          CapabilityBoundingSet = [ "" ];
+          DeviceAllow = [ "" ];
+          LockPersonality = true;
+          # Might work, but wouldn't bet on it with embedded lua in mpv
+          MemoryDenyWriteExecute = false;
+          NoNewPrivileges = true;
+          # MPV and mesa tries to talk directly to the GPU.
+          PrivateDevices = false;
+          PrivateMounts = true;
+          PrivateTmp = true;
+          PrivateUsers = true;
+          ProcSubset = "pid";
+          ProtectClock = true;
+          ProtectControlGroups = true;
+          # MPV wants ~/.cache
+          ProtectHome = false;
+          ProtectHostname = true;
+          ProtectKernelLogs = true;
+          ProtectKernelModules = true;
+          ProtectKernelTunables = true;
+          ProtectProc = "invisible";
+          # I'll figure it out sometime
+          # ProtectSystem = "full";
+          RemoveIPC = true;
+          UMask = "0077";
+          RestrictNamespaces = true;
+          RestrictRealtime = true;
+          RestrictSUIDSGID = true;
+          SystemCallArchitectures = "native";
+          # Something brokey
+          # SystemCallFilter = [
+          #   "@system-service"
+          #   "~@privileged"
+          #   "~@resources"
+          # ];
+        };
+      };
+    })
+    (lib.mkIf (cfg.enable && cfg.enablePipewire) {
+      services.pipewire = {
+        enable = true;
+        alsa.enable = true;
+        alsa.support32Bit = true;
+        pulse.enable = true;
+      };
+    })
+    (lib.mkIf (cfg.enable && cfg.enableSway) {
+      programs.sway = {
+        enable = true;
+        wrapperFeatures.gtk = true;
+      };
+
+      xdg.portal = {
+        enable = true;
+        wlr.enable = true;
+        extraPortals = [ pkgs.xdg-desktop-portal-gtk ];
+      };
+
+      users = {
+        users.greg = {
+          isNormalUser = true;
+          group = "greg";
+          uid = 2000;
+          description = "loud gym bro";
+        };
+        groups.greg.gid = 2000;
+      };
+
+      services.greetd = {
+        enable = true;
+        settings = rec {
+          initial_session = {
+            command = "${pkgs.sway}/bin/sway";
+            user = "greg";
+          };
+          default_session = initial_session;
+        };
+      };
+    })
+  ];
+}

src/api.rs

@@ -1,4 +1,4 @@
 mod base;
 mod rest_wrapper_v1;
 
-pub use rest_wrapper_v1::rest_api_routes;
+pub use rest_wrapper_v1::{rest_api_routes, rest_api_docs};

src/api/rest_wrapper_v1.rs

@@ -8,6 +8,10 @@ use axum::{
 use mpvipc_async::Mpv;
 use serde_json::{json, Value};
 
+use utoipa::OpenApi;
+use utoipa_axum::{router::OpenApiRouter, routes};
+use utoipa_swagger_ui::SwaggerUi;
+
 use super::base;
 
 pub fn rest_api_routes(mpv: Mpv) -> Router {
@@ -31,6 +35,69 @@ pub fn rest_api_routes(mpv: Mpv) -> Router {
         .with_state(mpv)
 }
 
+pub fn rest_api_docs(mpv: Mpv) -> Router {
+    let (router, api) = OpenApiRouter::with_openapi(ApiDoc::openapi())
+        .routes(routes!(loadfile))
+        .routes(routes!(play_get, play_set))
+        .routes(routes!(volume_get, volume_set))
+        .routes(routes!(time_get, time_set))
+        .routes(routes!(
+          playlist_get,
+          playlist_remove_or_clear
+        ))
+        .routes(routes!(playlist_next))
+        .routes(routes!(playlist_previous))
+        .routes(routes!(playlist_goto))
+        .routes(routes!(playlist_move))
+        .routes(routes!(playlist_get_looping, playlist_set_looping))
+        .routes(routes!(shuffle))
+        .with_state(mpv)
+        .split_for_parts();
+
+    router.merge(SwaggerUi::new("/docs").url("/docs/openapi.json", api))
+}
+
+// NOTE: the openapi stuff is very heavily duplicated and introduces
+//       a lot of maintenance overhead and boilerplate. It should theoretically
+//       be possible to infer a lot of this from axum, but I haven't found a
+//       good library that does this and works properly yet (I have tried some
+//       but they all had issues). Feel free to replace this with a better solution.
+
+#[derive(OpenApi)]
+#[openapi(
+    info(
+      description = "The legacy Grzegorz Brzeczyszczykiewicz API, used to control a running mpv instance",
+      version = "1.0.0",
+    ),
+)]
+struct ApiDoc;
+
+#[derive(serde::Serialize, utoipa::ToSchema)]
+struct EmptySuccessResponse {
+    success: bool,
+    error: bool,
+}
+
+#[derive(serde::Serialize, utoipa::ToSchema)]
+struct SuccessResponse {
+    #[schema(example = true)]
+    success: bool,
+    #[schema(example = false)]
+    error: bool,
+    #[schema(example = json!({ some: "arbitrary json value" }))]
+    value: Value,
+}
+
+#[derive(serde::Serialize, utoipa::ToSchema)]
+struct ErrorResponse {
+    #[schema(example = "error....")]
+    error: String,
+    #[schema(example = "error....")]
+    errortext: String,
+    #[schema(example = false)]
+    success: bool,
+}
+
 pub struct RestResponse(anyhow::Result<Value>);
 
 impl From<anyhow::Result<Value>> for RestResponse {
@@ -64,73 +131,178 @@ impl IntoResponse for RestResponse {
 
 // TODO: These could possibly be generated with a proc macro
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct LoadFileArgs {
     path: String,
 }
 
+
+/// Add item to playlist
+#[utoipa::path(
+    post,
+    path = "/load",
+    params(LoadFileArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn loadfile(State(mpv): State<Mpv>, Query(query): Query<LoadFileArgs>) -> RestResponse {
     base::loadfile(mpv, &query.path).await.into()
 }
 
+/// Check whether the player is paused or playing
+#[utoipa::path(
+    get,
+    path = "/play",
+    responses(
+        (status = 200, description = "Success", body = SuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn play_get(State(mpv): State<Mpv>) -> RestResponse {
     base::play_get(mpv).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct PlaySetArgs {
     play: String,
 }
 
+/// Set whether the player is paused or playing
+#[utoipa::path(
+    post,
+    path = "/play",
+    params(PlaySetArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn play_set(State(mpv): State<Mpv>, Query(query): Query<PlaySetArgs>) -> RestResponse {
     let play = query.play.to_lowercase() == "true";
     base::play_set(mpv, play).await.into()
 }
 
+/// Get the current player volume
+#[utoipa::path(
+    get,
+    path = "/volume",
+    responses(
+        (status = 200, description = "Success", body = SuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn volume_get(State(mpv): State<Mpv>) -> RestResponse {
     base::volume_get(mpv).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct VolumeSetArgs {
     volume: f64,
 }
 
+/// Set the player volume
+#[utoipa::path(
+    post,
+    path = "/volume",
+    params(VolumeSetArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn volume_set(State(mpv): State<Mpv>, Query(query): Query<VolumeSetArgs>) -> RestResponse {
     base::volume_set(mpv, query.volume).await.into()
 }
 
+/// Get current playback position
+#[utoipa::path(
+    get,
+    path = "/time",
+    responses(
+        (status = 200, description = "Success", body = SuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn time_get(State(mpv): State<Mpv>) -> RestResponse {
     base::time_get(mpv).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct TimeSetArgs {
     pos: Option<f64>,
     percent: Option<f64>,
 }
 
+/// Set playback position
+#[utoipa::path(
+    post,
+    path = "/time",
+    params(TimeSetArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn time_set(State(mpv): State<Mpv>, Query(query): Query<TimeSetArgs>) -> RestResponse {
     base::time_set(mpv, query.pos, query.percent).await.into()
 }
 
+/// Get the current playlist
+#[utoipa::path(
+    get,
+    path = "/playlist",
+    responses(
+        (status = 200, description = "Success", body = SuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_get(State(mpv): State<Mpv>) -> RestResponse {
     base::playlist_get(mpv).await.into()
 }
 
+/// Go to the next item in the playlist
+#[utoipa::path(
+    post,
+    path = "/playlist/next",
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_next(State(mpv): State<Mpv>) -> RestResponse {
     base::playlist_next(mpv).await.into()
 }
 
+/// Go back to the previous item in the playlist
+#[utoipa::path(
+    post,
+    path = "/playlist/previous",
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_previous(State(mpv): State<Mpv>) -> RestResponse {
     base::playlist_previous(mpv).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct PlaylistGotoArgs {
     index: usize,
 }
 
+/// Go to a specific item in the playlist
+#[utoipa::path(
+    post,
+    path = "/playlist/goto",
+    params(PlaylistGotoArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_goto(
     State(mpv): State<Mpv>,
     Query(query): Query<PlaylistGotoArgs>,
@@ -138,11 +310,21 @@ async fn playlist_goto(
     base::playlist_goto(mpv, query.index).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct PlaylistRemoveOrClearArgs {
     index: Option<usize>,
 }
 
+/// Clears a single item or the entire playlist
+#[utoipa::path(
+    delete,
+    path = "/playlist",
+    params(PlaylistRemoveOrClearArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_remove_or_clear(
     State(mpv): State<Mpv>,
     Query(query): Query<PlaylistRemoveOrClearArgs>,
@@ -153,12 +335,22 @@ async fn playlist_remove_or_clear(
     }
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct PlaylistMoveArgs {
     index1: usize,
     index2: usize,
 }
 
+/// Move a playlist item to a different position
+#[utoipa::path(
+    post,
+    path = "/playlist/move",
+    params(PlaylistMoveArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_move(
     State(mpv): State<Mpv>,
     Query(query): Query<PlaylistMoveArgs>,
@@ -168,19 +360,47 @@ async fn playlist_move(
         .into()
 }
 
+/// Shuffle the playlist
+#[utoipa::path(
+    post,
+    path = "/playlist/shuffle",
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn shuffle(State(mpv): State<Mpv>) -> RestResponse {
     base::shuffle(mpv).await.into()
 }
 
+/// Check whether the playlist is looping
+#[utoipa::path(
+    get,
+    path = "/playlist/loop",
+    responses(
+        (status = 200, description = "Success", body = SuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_get_looping(State(mpv): State<Mpv>) -> RestResponse {
     base::playlist_get_looping(mpv).await.into()
 }
 
-#[derive(serde::Deserialize)]
+#[derive(serde::Deserialize, utoipa::IntoParams)]
 struct PlaylistSetLoopingArgs {
     r#loop: bool,
 }
 
+/// Set whether the playlist should loop
+#[utoipa::path(
+    post,
+    path = "/playlist/loop",
+    params(PlaylistSetLoopingArgs),
+    responses(
+        (status = 200, description = "Success", body = EmptySuccessResponse),
+        (status = 500, description = "Internal server error", body = ErrorResponse),
+    )
+)]
 async fn playlist_set_looping(
     State(mpv): State<Mpv>,
     Query(query): Query<PlaylistSetLoopingArgs>,

src/main.rs

@@ -1,15 +1,15 @@
 use anyhow::Context;
-use axum::{Router, Server};
+use axum::Router;
 use clap::Parser;
+use clap_verbosity_flag::Verbosity;
+use mpv_setup::{connect_to_mpv, create_mpv_config_file, show_grzegorz_image};
 use mpvipc_async::Mpv;
-use std::{
-    fs::create_dir_all,
-    net::{IpAddr, SocketAddr},
-    path::Path,
-};
-use tokio::process::{Child, Command};
+use std::net::{IpAddr, SocketAddr};
+use systemd_journal_logger::JournalLog;
+use tempfile::NamedTempFile;
 
 mod api;
+mod mpv_setup;
 
 #[derive(Parser)]
 struct Args {
@@ -19,12 +19,21 @@ struct Args {
     #[clap(short, long, default_value = "8008")]
     port: u16,
 
+    #[command(flatten)]
+    verbose: Verbosity,
+
+    #[clap(long)]
+    systemd: bool,
+
     #[clap(long, value_name = "PATH", default_value = "/run/mpv/mpv.sock")]
     mpv_socket_path: String,
 
     #[clap(long, value_name = "PATH")]
     mpv_executable_path: Option<String>,
 
+    #[clap(long, value_name = "PATH")]
+    mpv_config_file: Option<String>,
+
     #[clap(long, default_value = "true")]
     auto_start_mpv: bool,
 
@@ -32,90 +41,16 @@ struct Args {
     force_auto_start: bool,
 }
 
-struct MpvConnectionArgs {
+struct MpvConnectionArgs<'a> {
     socket_path: String,
     executable_path: Option<String>,
+    config_file: &'a NamedTempFile,
     auto_start: bool,
     force_auto_start: bool,
 }
 
-async fn connect_to_mpv(args: &MpvConnectionArgs) -> anyhow::Result<(Mpv, Option<Child>)> {
-    log::debug!("Connecting to mpv");
-
-    debug_assert!(
-        !args.force_auto_start || args.auto_start,
-        "force_auto_start requires auto_start"
-    );
-
-    let socket_path = Path::new(&args.socket_path);
-
-    if !socket_path.exists() {
-        log::debug!("Mpv socket not found at {}", &args.socket_path);
-        if !args.auto_start {
-            panic!("Mpv socket not found at {}", &args.socket_path);
-        }
-
-        log::debug!("Ensuring parent dir of mpv socket exists");
-        let parent_dir = Path::new(&args.socket_path)
-            .parent()
-            .context("Failed to get parent dir of mpv socket")?;
-
-        if !parent_dir.is_dir() {
-            create_dir_all(parent_dir).context("Failed to create parent dir of mpv socket")?;
-        }
-    } else {
-        log::debug!("Existing mpv socket found at {}", &args.socket_path);
-        if args.force_auto_start {
-            log::debug!("Removing mpv socket");
-            std::fs::remove_file(&args.socket_path)?;
-        }
-    }
-
-    let process_handle = if args.auto_start {
-        log::info!("Starting mpv with socket at {}", &args.socket_path);
-
-        // TODO: try to fetch mpv from PATH
-        Some(
-            Command::new(args.executable_path.as_deref().unwrap_or("mpv"))
-                .arg(format!("--input-ipc-server={}", &args.socket_path))
-                .arg("--idle")
-                .arg("--force-window")
-                .arg("--fullscreen")
-                // .arg("--no-terminal")
-                .arg("--load-unsafe-playlists")
-                .arg("--keep-open") // Keep last frame of video on end of video
-                .spawn()
-                .context("Failed to start mpv")?,
-        )
-    } else {
-        None
-    };
-
-    // Wait for mpv to create the socket
-    if tokio::time::timeout(tokio::time::Duration::from_millis(500), async {
-        while !&socket_path.exists() {
-            log::debug!("Waiting for mpv socket at {}", &args.socket_path);
-            tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
-        }
-    })
-    .await
-    .is_err()
-    {
-        return Err(anyhow::anyhow!(
-            "Failed to connect to mpv socket: {}",
-            &args.socket_path
-        ));
-    }
-
-    Ok((
-        Mpv::connect(&args.socket_path).await.context(format!(
-            "Failed to connect to mpv socket: {}",
-            &args.socket_path
-        ))?,
-        process_handle,
-    ))
-}
-
+/// Helper function to resolve a hostname to an IP address.
+/// Why is this not in the standard library? >:(
 async fn resolve(host: &str) -> anyhow::Result<IpAddr> {
     let addr = format!("{}:0", host);
     let addresses = tokio::net::lookup_host(addr).await?;
@@ -126,44 +61,147 @@ async fn resolve(host: &str) -> anyhow::Result<IpAddr> {
         .ok_or_else(|| anyhow::anyhow!("Failed to resolve address"))
 }
 
+/// Helper function that spawns a tokio thread that
+/// continuously sends a ping to systemd watchdog, if enabled.
+async fn setup_systemd_watchdog_thread() -> anyhow::Result<()> {
+    let mut watchdog_microsecs: u64 = 0;
+    if sd_notify::watchdog_enabled(true, &mut watchdog_microsecs) {
+        watchdog_microsecs = watchdog_microsecs.div_ceil(2);
+        tokio::spawn(async move {
+            log::debug!(
+                "Starting systemd watchdog thread with {} millisecond interval",
+                watchdog_microsecs.div_ceil(1000)
+            );
+            loop {
+                tokio::time::sleep(tokio::time::Duration::from_micros(watchdog_microsecs)).await;
+                if let Err(err) = sd_notify::notify(false, &[sd_notify::NotifyState::Watchdog]) {
+                    log::warn!("Failed to notify systemd watchdog: {}", err);
+                } else {
+                    log::trace!("Ping sent to systemd watchdog");
+                }
+            }
+        });
+    } else {
+        log::info!("Watchdog not enabled, skipping");
+    }
+    Ok(())
+}
+
+async fn shutdown(mpv: Mpv, proc: Option<tokio::process::Child>) {
+    log::info!("Shutting down");
+    sd_notify::notify(false, &[sd_notify::NotifyState::Stopping]).unwrap_or_else(|e| {
+        log::warn!(
+            "Failed to notify systemd that the service is stopping: {}",
+            e
+        )
+    });
+
+    mpv.disconnect()
+        .await
+        .unwrap_or_else(|e| log::warn!("Failed to disconnect from mpv: {}", e));
+    if let Some(mut proc) = proc {
+        proc.kill()
+            .await
+            .unwrap_or_else(|e| log::warn!("Failed to kill mpv process: {}", e));
+    }
+}
+
 #[tokio::main]
 async fn main() -> anyhow::Result<()> {
-    env_logger::init();
     let args = Args::parse();
 
+    let systemd_mode = args.systemd && sd_notify::booted().unwrap_or(false);
+    if systemd_mode {
+        JournalLog::new()
+            .context("Failed to initialize journald logging")?
+            .install()
+            .context("Failed to install journald logger")?;
+
+        log::set_max_level(args.verbose.log_level_filter());
+
+        log::debug!("Running with systemd integration");
+
+        setup_systemd_watchdog_thread().await?;
+    } else {
+        env_logger::Builder::new()
+            .filter_level(args.verbose.log_level_filter())
+            .init();
+
+        log::info!("Running without systemd integration");
+    }
+
+    let mpv_config_file = create_mpv_config_file(args.mpv_config_file)?;
+
     let (mpv, proc) = connect_to_mpv(&MpvConnectionArgs {
         socket_path: args.mpv_socket_path,
         executable_path: args.mpv_executable_path,
+        config_file: &mpv_config_file,
         auto_start: args.auto_start_mpv,
         force_auto_start: args.force_auto_start,
     })
-    .await?;
+    .await
+    .context("Failed to connect to mpv")?;
 
-    let addr = SocketAddr::new(resolve(&args.host).await?, args.port);
-    log::info!("Starting API on {}", addr);
+    if let Err(e) = show_grzegorz_image(mpv.clone()).await {
+        log::warn!("Could not show Grzegorz image: {}", e);
+    }
 
-    let app = Router::new().nest("/api", api::rest_api_routes(mpv.clone()));
+    let addr = match resolve(&args.host)
+        .await
+        .context(format!("Failed to resolve address: {}", &args.host))
+    {
+        Ok(addr) => addr,
+        Err(e) => {
+            log::error!("{}", e);
+            shutdown(mpv, proc).await;
+            return Err(e);
+        }
+    };
+    let socket_addr = SocketAddr::new(addr, args.port);
+    log::info!("Starting API on {}", socket_addr);
+
+    let app = Router::new()
+        .nest("/api", api::rest_api_routes(mpv.clone()))
+        .merge(api::rest_api_docs(mpv.clone()));
+
+    let listener = match tokio::net::TcpListener::bind(&socket_addr)
+        .await
+        .context(format!("Failed to bind API server to '{}'", &socket_addr))
+    {
+        Ok(listener) => listener,
+        Err(e) => {
+            log::error!("{}", e);
+            shutdown(mpv, proc).await;
+            return Err(e);
+        }
+    };
+
+    if systemd_mode {
+        match sd_notify::notify(false, &[sd_notify::NotifyState::Ready])
+            .context("Failed to notify systemd that the service is ready")
+        {
+            Ok(_) => log::trace!("Notified systemd that the service is ready"),
+            Err(e) => {
+                log::error!("{}", e);
+                shutdown(mpv, proc).await;
+                return Err(e);
+            }
+        }
+    }
 
     if let Some(mut proc) = proc {
         tokio::select! {
             exit_status = proc.wait() => {
                 log::warn!("mpv process exited with status: {}", exit_status?);
-                mpv.disconnect().await?;
+                shutdown(mpv, Some(proc)).await;
             }
             _ = tokio::signal::ctrl_c() => {
                 log::info!("Received Ctrl-C, exiting");
-                mpv.disconnect().await?;
-                proc.kill().await?;
+                shutdown(mpv, Some(proc)).await;
             }
-            result = async {
-              match Server::try_bind(&addr.clone()).context("Failed to bind server") {
-                Ok(server) => server.serve(app.into_make_service()).await.context("Failed to serve app"),
-                Err(err) => Err(err),
-              }
-            } => {
+            result = axum::serve(listener, app.into_make_service()) => {
               log::info!("API server exited");
-              mpv.disconnect().await?;
-              proc.kill().await?;
+              shutdown(mpv, Some(proc)).await;
               result?;
             }
         }
@@ -171,14 +209,17 @@ async fn main() -> anyhow::Result<()> {
         tokio::select! {
             _ = tokio::signal::ctrl_c() => {
                 log::info!("Received Ctrl-C, exiting");
-                mpv.disconnect().await?;
+                shutdown(mpv.clone(), None).await;
             }
-            _ =  Server::bind(&addr.clone()).serve(app.into_make_service()) => {
+            result = axum::serve(listener, app.into_make_service()) => {
               log::info!("API server exited");
-                mpv.disconnect().await?;
+              shutdown(mpv.clone(), None).await;
+              result?;
             }
         }
     }
 
+    std::mem::drop(mpv_config_file);
+
     Ok(())
 }

src/mpv_setup.rs

@@ -0,0 +1,135 @@
+use std::{fs::create_dir_all, io::Write, path::Path};
+
+use anyhow::Context;
+use mpvipc_async::{Mpv, MpvExt};
+use tempfile::NamedTempFile;
+use tokio::process::{Child, Command};
+
+use crate::MpvConnectionArgs;
+
+const DEFAULT_MPV_CONFIG_CONTENT: &str = include_str!("../assets/default-mpv.conf");
+
+const THE_MAN_PNG: &[u8] = include_bytes!("../assets/the_man.png");
+
+pub fn create_mpv_config_file(args_config_file: Option<String>) -> anyhow::Result<NamedTempFile> {
+    let file_content = if let Some(path) = args_config_file {
+        if !Path::new(&path).exists() {
+            anyhow::bail!("Mpv config file not found at {}", &path);
+        }
+
+        std::fs::read_to_string(&path).context("Failed to read mpv config file")?
+    } else {
+        DEFAULT_MPV_CONFIG_CONTENT.to_string()
+    };
+
+    let tmpfile = tempfile::Builder::new()
+        .prefix("mpv-")
+        .rand_bytes(8)
+        .suffix(".conf")
+        .tempfile()?;
+
+    tmpfile.reopen()?.write_all(file_content.as_bytes())?;
+
+    Ok(tmpfile)
+}
+
+pub async fn connect_to_mpv<'a>(
+    args: &MpvConnectionArgs<'a>,
+) -> anyhow::Result<(Mpv, Option<Child>)> {
+    log::debug!("Connecting to mpv");
+
+    debug_assert!(
+        !args.force_auto_start || args.auto_start,
+        "force_auto_start requires auto_start"
+    );
+
+    let socket_path = Path::new(&args.socket_path);
+
+    if !socket_path.exists() {
+        log::debug!("Mpv socket not found at {}", &args.socket_path);
+        if !args.auto_start {
+            panic!("Mpv socket not found at {}", &args.socket_path);
+        }
+
+        log::debug!("Ensuring parent dir of mpv socket exists");
+        let parent_dir = Path::new(&args.socket_path)
+            .parent()
+            .context("Failed to get parent dir of mpv socket")?;
+
+        if !parent_dir.is_dir() {
+            create_dir_all(parent_dir).context("Failed to create parent dir of mpv socket")?;
+        }
+    } else {
+        log::debug!("Existing mpv socket found at {}", &args.socket_path);
+        if args.force_auto_start {
+            log::debug!("Removing mpv socket");
+            std::fs::remove_file(&args.socket_path)?;
+        }
+    }
+
+    let process_handle = if args.auto_start {
+        log::info!("Starting mpv with socket at {}", &args.socket_path);
+
+        // TODO: try to fetch mpv from PATH
+        Some(
+            Command::new(args.executable_path.as_deref().unwrap_or("mpv"))
+                .arg(format!("--input-ipc-server={}", &args.socket_path))
+                .arg("--idle")
+                .arg("--force-window")
+                .arg("--fullscreen")
+                .arg("--no-config")
+                .arg(format!(
+                    "--include={}",
+                    &args.config_file.path().to_string_lossy()
+                ))
+                // .arg("--no-terminal")
+                .arg("--load-unsafe-playlists")
+                .arg("--keep-open") // Keep last frame of video on end of video
+                .spawn()
+                .context("Failed to start mpv")?,
+        )
+    } else {
+        None
+    };
+
+    // Wait for mpv to create the socket
+    if tokio::time::timeout(tokio::time::Duration::from_millis(500), async {
+        while !&socket_path.exists() {
+            log::debug!("Waiting for mpv socket at {}", &args.socket_path);
+            tokio::time::sleep(tokio::time::Duration::from_millis(10)).await;
+        }
+    })
+    .await
+    .is_err()
+    {
+        return Err(anyhow::anyhow!(
+            "Failed to connect to mpv socket: {}",
+            &args.socket_path
+        ));
+    }
+
+    Ok((
+        Mpv::connect(&args.socket_path).await.context(format!(
+            "Failed to connect to mpv socket: {}",
+            &args.socket_path
+        ))?,
+        process_handle,
+    ))
+}
+
+pub async fn show_grzegorz_image(mpv: Mpv) -> anyhow::Result<()> {
+    let path = std::env::temp_dir().join("the_man.png");
+    std::fs::write(path.as_path(), THE_MAN_PNG)?;
+
+    mpv.playlist_clear().await?;
+    mpv.playlist_add(
+        path.to_string_lossy().as_ref(),
+        mpvipc_async::PlaylistAddTypeOptions::File,
+        mpvipc_async::PlaylistAddOptions::Append,
+    )
+    .await?;
+    mpv.next().await?;
+
+    Ok(())
+}
+