From f1d105896bc247c3d1aa164d31d805fcb4c1defe Mon Sep 17 00:00:00 2001 From: Mikko Ahlroth Date: Thu, 18 May 2023 17:48:53 +0300 Subject: [PATCH] Hackfest --- .gitignore | 6 + .tool-versions | 1 + LICENSE | 661 +++++++++++++++++++++++++++++++++ README.md | 3 + gleam.toml | 19 + manifest.toml | 13 + src/conductor.gleam | 59 +++ src/conductor/cec.gleam | 0 src/conductor/config.gleam | 50 +++ src/conductor/exec.gleam | 69 ++++ src/conductor/ffprobe.gleam | 24 ++ src/conductor/fs.gleam | 21 ++ src/conductor/fsm.gleam | 139 +++++++ src/conductor/glob_state.gleam | 40 ++ src/conductor/vlc.gleam | 26 ++ src/process_ffi.mjs | 9 + 16 files changed, 1140 insertions(+) create mode 100644 .gitignore create mode 100644 .tool-versions create mode 100644 LICENSE create mode 100644 README.md create mode 100644 gleam.toml create mode 100644 manifest.toml create mode 100644 src/conductor.gleam create mode 100644 src/conductor/cec.gleam create mode 100644 src/conductor/config.gleam create mode 100644 src/conductor/exec.gleam create mode 100644 src/conductor/ffprobe.gleam create mode 100644 src/conductor/fs.gleam create mode 100644 src/conductor/fsm.gleam create mode 100644 src/conductor/glob_state.gleam create mode 100644 src/conductor/vlc.gleam create mode 100644 src/process_ffi.mjs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..cd7d7ca --- /dev/null +++ b/.gitignore @@ -0,0 +1,6 @@ +*.beam +*.ez +build +erl_crash.dump +.DS_Store +choochoo diff --git a/.tool-versions b/.tool-versions new file mode 100644 index 0000000..8ead549 --- /dev/null +++ b/.tool-versions @@ -0,0 +1 @@ +nodejs 18.16.0 diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..19bae35 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. +Everyone is permitted to copy and distribute verbatim copies +of this license document, but changing it is not allowed. + + Preamble + +The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + +You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..a4071a5 --- /dev/null +++ b/README.md @@ -0,0 +1,3 @@ +# Conductor + +A conductor program for a [Trainfulness](https://trainfulness.com/) TV at [Vincit](https://www.vincit.com) office. diff --git a/gleam.toml b/gleam.toml new file mode 100644 index 0000000..3e6851f --- /dev/null +++ b/gleam.toml @@ -0,0 +1,19 @@ +name = "conductor" +version = "0.1.0" +description = "A Gleam project" + +# Fill out these fields if you intend to generate HTML documentation or publish +# your project to the Hex package manager. +# +# licences = ["Apache-2.0"] +# repository = { type = "github", user = "username", repo = "project" } +# links = [{ title = "Website", href = "https://gleam.run" }] + +target = "javascript" + +[dependencies] +gleam_stdlib = "~> 0.28" +gleam_javascript = "~> 0.4" + +[dev-dependencies] +gleeunit = "~> 0.10" diff --git a/manifest.toml b/manifest.toml new file mode 100644 index 0000000..56b6b83 --- /dev/null +++ b/manifest.toml @@ -0,0 +1,13 @@ +# This file was generated by Gleam +# You typically do not need to edit this file + +packages = [ + { name = "gleam_javascript", version = "0.4.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_javascript", source = "hex", outer_checksum = "E0E8D33461776BFCC124838183F85E430D3A71D7318F210C9DE0CFB52E5AC8DE" }, + { name = "gleam_stdlib", version = "0.28.2", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "088E334A00C9530D4B194F31406E51B6E4E4697C6A380D11591E60CC2F239724" }, + { name = "gleeunit", version = "0.10.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleeunit", source = "hex", outer_checksum = "ECEA2DE4BE6528D36AFE74F42A21CDF99966EC36D7F25DEB34D47DD0F7977BAF" }, +] + +[requirements] +gleam_javascript = "~> 0.4" +gleam_stdlib = "~> 0.28" +gleeunit = "~> 0.10" diff --git a/src/conductor.gleam b/src/conductor.gleam new file mode 100644 index 0000000..9c4e0a6 --- /dev/null +++ b/src/conductor.gleam @@ -0,0 +1,59 @@ +import gleam/io +import gleam/string +import gleam/int +import conductor/fsm +import conductor/glob_state + +const tick_length = 1 + +pub fn main() { + glob_state.init() + + set_sigint_handler(sigint) + + let state = glob_state.Idle + let action = glob_state.StartPlay + + glob_state.set_state(state) + glob_state.set_action(action) + + tick() +} + +fn tick() -> Nil { + let glob_state = glob_state.get() + + case glob_state.state { + glob_state.Idle -> Nil + glob_state.Playing(played_for: played_for, ..) -> + io.println( + "Tick! Played for: " <> int.to_string(played_for) <> ", pending action: " <> string.inspect( + glob_state.pending_action, + ), + ) + } + + let next_state = fsm.run(glob_state.state, glob_state.pending_action) + + glob_state.set_state(next_state) + glob_state.set_action(glob_state.Tick(seconds: tick_length)) + + schedule_next_tick(fn() { tick() }, tick_length * 1000) +} + +fn sigint() -> Nil { + io.println("Got SIGINT, triggering new video...") + + let glob_state = glob_state.get() + + case glob_state.state { + glob_state.Idle -> glob_state.set_action(glob_state.StartPlay) + _ -> Nil + } +} + +external fn schedule_next_tick(tick: fn() -> Nil, milliseconds: Int) -> Nil = + "" "((f, t) => globalThis.setTimeout(f, t))" + +external fn set_sigint_handler(handler: fn() -> Nil) -> Nil = + "./process_ffi.mjs" "set_sigint_handler" diff --git a/src/conductor/cec.gleam b/src/conductor/cec.gleam new file mode 100644 index 0000000..e69de29 diff --git a/src/conductor/config.gleam b/src/conductor/config.gleam new file mode 100644 index 0000000..87ab39b --- /dev/null +++ b/src/conductor/config.gleam @@ -0,0 +1,50 @@ +import gleam/int + +const default_video_path = "./choochoo" + +const default_vlc_bin = "vlc" + +const default_play_timeout = "30" + +const default_start_from_end = "300" + +external type Env + +pub fn video_path() { + get_path("VIDEO_PATH", default_video_path) +} + +pub fn vlc_path() { + get_path("VLC_BIN", default_vlc_bin) +} + +pub fn play_timeout() { + let timeout_str = get_path("PLAY_TIMEOUT", default_play_timeout) + + let assert Ok(timeout_int) = int.parse(timeout_str) + timeout_int +} + +pub fn start_from_end() { + let str = get_path("START_FROM_END", default_start_from_end) + + let assert Ok(i) = int.parse(str) + i +} + +fn get_path(key: String, default: String) { + let path = + get_all_env() + |> get_from_env(key) + + case path { + "" -> default + _ -> path + } +} + +external fn get_from_env(env: Env, value: String) -> String = + "" "((e, v) => e[v] || '')" + +external fn get_all_env() -> Env = + "../process_ffi.mjs" "get_env" diff --git a/src/conductor/exec.gleam b/src/conductor/exec.gleam new file mode 100644 index 0000000..5ce9684 --- /dev/null +++ b/src/conductor/exec.gleam @@ -0,0 +1,69 @@ +import gleam/io +import gleam/string +import gleam/javascript/array.{Array} + +pub external type ChildProcess + +pub external type Error + +external type ExecFileOptions + +external type StringOrBuffer + +pub type ExecFileCallback = + fn(Error, String, String) -> Nil + +pub fn kill(child: ChildProcess) -> Result(Nil, Nil) { + case kill_internal(child) { + True -> Ok(Nil) + False -> Error(Nil) + } +} + +pub fn exec_file( + command: String, + args: List(String), + callback: ExecFileCallback, +) { + io.println("Running command: " <> command <> " " <> string.inspect(args)) + exec_file_internal( + command, + array.from_list(args), + exec_file_options(), + callback, + ) +} + +external fn exec_file_internal( + command: String, + args: Array(String), + options: ExecFileOptions, + callback: ExecFileCallback, +) -> ChildProcess = + "node:child_process" "execFile" + +pub fn exec_file_sync(command: String, args: List(String)) -> String { + io.println("Running command: " <> command <> " " <> string.inspect(args)) + exec_file_sync_internal(command, array.from_list(args), exec_file_options()) + |> normalise_output() + |> string.trim() +} + +external fn exec_file_sync_internal( + command: String, + args: Array(String), + options: ExecFileOptions, +) -> StringOrBuffer = + "node:child_process" "execFileSync" + +external fn exec_file_options() -> ExecFileOptions = + "" "(() => ({}))" + +external fn kill_internal(child: ChildProcess) -> Bool = + "" "(c => c.kill())" + +pub external fn is_error(error: Error) -> Bool = + "" "(e => e instanceof Error)" + +external fn normalise_output(output: StringOrBuffer) -> String = + "" "(bos => Buffer.isBuffer(bos) ? bos.toString() : bos)" diff --git a/src/conductor/ffprobe.gleam b/src/conductor/ffprobe.gleam new file mode 100644 index 0000000..3376f21 --- /dev/null +++ b/src/conductor/ffprobe.gleam @@ -0,0 +1,24 @@ +import gleam/float +import conductor/exec + +pub fn get_duration(file: String) -> Result(Int, Nil) { + let out = + exec.exec_file_sync( + // Courtesy of CodeZ + "ffprobe", + [ + "-of", + "default=nk=1:nw=1", + "-select_streams", + "v", + "-show_entries", + "stream=duration", + file, + ], + ) + + case float.parse(out) { + Ok(f) -> Ok(float.truncate(f)) + Error(_) -> Error(Nil) + } +} diff --git a/src/conductor/fs.gleam b/src/conductor/fs.gleam new file mode 100644 index 0000000..66f1bc7 --- /dev/null +++ b/src/conductor/fs.gleam @@ -0,0 +1,21 @@ +import gleam/list +import gleam/javascript/array.{Array} + +pub fn get_files(dir: String) -> List(String) { + dir + |> read_dir() + |> array.to_list() + |> list.filter(fn(file) { + case file { + "." <> _rest -> False + _ -> True + } + }) + |> list.map(fn(file) { resolve_path(dir, file) }) +} + +external fn read_dir(dir: String) -> Array(String) = + "node:fs" "readdirSync" + +external fn resolve_path(dir: String, file: String) -> String = + "node:path" "resolve" diff --git a/src/conductor/fsm.gleam b/src/conductor/fsm.gleam new file mode 100644 index 0000000..1a9b855 --- /dev/null +++ b/src/conductor/fsm.gleam @@ -0,0 +1,139 @@ +import gleam/list +import gleam/io +import gleam/string +import gleam/int +import conductor/config +import conductor/fs +import conductor/vlc +import conductor/exec +import conductor/glob_state.{ + Action, EOF, Idle, None, NotStarted, Player, Playing, StartPlay, Started, + State, Tick, +} +import conductor/ffprobe + +pub fn run(state: State, action: Action) -> State { + state + |> move(action) + |> do_effects(state) +} + +fn move(state: State, action: Action) -> State { + case action { + None -> state + other_action -> + case state, other_action { + Idle, StartPlay -> init_playing() + Idle, _ -> state + Playing(file, started_from, played_for, upcoming, player), Tick(seconds) -> { + let total_seconds = played_for + seconds + + case total_seconds > config.play_timeout() { + True -> { + kill_vlc(player) + Idle + } + False -> + Playing(file, started_from, total_seconds, upcoming, player) + } + } + Playing(upcoming: upcoming, played_for: played_for, ..), _ -> { + case list.length(upcoming) { + 0 -> Idle + _ -> { + let assert Ok(next) = list.first(upcoming) + let assert Ok(rest) = list.rest(upcoming) + Playing(next, 0, played_for, rest, NotStarted) + } + } + } + } + } +} + +fn do_effects(new_state: State, prev_state: State) -> State { + case new_state { + Idle -> new_state + Playing(file, started_from, played_for, upcoming, ..) -> { + case prev_state { + Playing(prev_file, player: prev_player, ..) if prev_file != file -> { + kill_vlc(prev_player) + + start_playing(file, started_from, played_for, upcoming) + } + + Idle -> { + start_playing(file, started_from, played_for, upcoming) + } + + _ -> new_state + } + } + } +} + +fn init_playing() -> State { + let movies = fs.get_files(config.video_path()) + let movies_amount = list.length(movies) + + case movies_amount { + 0 -> panic + _ -> Nil + } + + let start_index = int.random(1, movies_amount) + let assert #(start_section, rest) = list.split(movies, start_index) + let assert Ok(first) = list.last(start_section) + + let assert Ok(duration) = ffprobe.get_duration(first) + + let max_start = duration - config.start_from_end() + let start = int.random(0, max_start) + Playing( + file: first, + started_from: start, + played_for: 0, + upcoming: rest, + player: NotStarted, + ) +} + +fn start_playing( + file: String, + started_from: Int, + played_for: Int, + upcoming: List(String), +) { + let player = launch_vlc(file, started_from) + Playing(file, started_from, played_for, upcoming, Started(player)) +} + +fn launch_vlc(file: String, started_from: Int) { + vlc.play_file( + file, + started_from, + fn(err, _, _) { + io.println_error("VLC exited due to: " <> string.inspect(err)) + + case exec.is_error(err) { + False -> glob_state.set_action(EOF) + True -> Nil + } + }, + ) +} + +fn kill_vlc(player: Player) -> Nil { + case player { + NotStarted -> Nil + Started(child) -> { + case exec.kill(child) { + Ok(_) -> Nil + Error(_) -> { + io.println_error("Warning! Unable to close VLC.") + Nil + } + } + } + } +} diff --git a/src/conductor/glob_state.gleam b/src/conductor/glob_state.gleam new file mode 100644 index 0000000..eca3e83 --- /dev/null +++ b/src/conductor/glob_state.gleam @@ -0,0 +1,40 @@ +import conductor/exec + +pub type GlobState { + GlobState(state: State, pending_action: Action) +} + +pub type Player { + NotStarted + Started(exec.ChildProcess) +} + +pub type State { + Idle + Playing( + file: String, + started_from: Int, + played_for: Int, + upcoming: List(String), + player: Player, + ) +} + +pub type Action { + None + Tick(seconds: Int) + EOF + StartPlay +} + +pub external fn get() -> GlobState = + "" "(() => new GlobState(globalThis.__conductor_glob_state.state, globalThis.__conductor_glob_state.action))" + +pub external fn set_state(state: State) -> Nil = + "" "(s => globalThis.__conductor_glob_state.state = s)" + +pub external fn set_action(action: Action) -> Nil = + "" "(a => globalThis.__conductor_glob_state.action = a)" + +pub external fn init() -> Nil = + "" "(() => globalThis.__conductor_glob_state = globalThis.__conductor_glob_state || {})" diff --git a/src/conductor/vlc.gleam b/src/conductor/vlc.gleam new file mode 100644 index 0000000..acd8a9f --- /dev/null +++ b/src/conductor/vlc.gleam @@ -0,0 +1,26 @@ +import gleam/int +import conductor/config +import conductor/exec + +pub fn play_file( + some_file: String, + start_from: Int, + callback: exec.ExecFileCallback, +) { + let start_from_str = int.to_string(start_from) + exec_vlc( + [ + some_file, + "--fullscreen", + "--play-and-exit", + "--no-audio", + "--start-time", + start_from_str, + ], + callback, + ) +} + +fn exec_vlc(args: List(String), callback: exec.ExecFileCallback) { + exec.exec_file(config.vlc_path(), args, callback) +} diff --git a/src/process_ffi.mjs b/src/process_ffi.mjs new file mode 100644 index 0000000..8a29b85 --- /dev/null +++ b/src/process_ffi.mjs @@ -0,0 +1,9 @@ +import process from "node:process"; + +export function get_env() { + return process.env; +} + +export function set_sigint_handler(handler) { + process.on("SIGINT", handler); +}