rs-terminal: support v3 PlayMessage and event subscriptions

senders/terminal/src/fcastsession.rs

@@ -1,18 +1,30 @@
-use std::sync::{
+use std::{
+    collections::HashMap,
+    sync::{
         atomic::{AtomicBool, Ordering},
         Arc,
+    },
 };
 
 use crate::{
-    models::v2::PlaybackUpdateMessage,
+    models::{
-    models::{PlaybackErrorMessage, VersionMessage, VolumeUpdateMessage},
+        v2::{self, PlaybackUpdateMessage},
+        v3, PlaybackErrorMessage, VersionMessage, VolumeUpdateMessage,
+    },
     transport::Transport,
 };
 use serde::Serialize;
 
-#[derive(Debug)]
+#[derive(Debug, PartialEq, Eq)]
+enum ProtoVersion {
+    V2,
+    V3,
+}
+
+#[derive(Debug, PartialEq, Eq)]
 enum SessionState {
-    Idle = 0,
+    Idle,
+    Connected(ProtoVersion),
     Disconnected,
 }
 
@@ -32,7 +44,6 @@ pub enum Opcode {
     Version = 11,
     Ping = 12,
     Pong = 13,
-
     Initial = 14,
     PlayUpdate = 15,
     SetPlaylistItem = 16,
@@ -58,7 +69,6 @@ impl Opcode {
             11 => Opcode::Version,
             12 => Opcode::Ping,
             13 => Opcode::Pong,
-
             14 => Opcode::Initial,
             15 => Opcode::PlayUpdate,
             16 => Opcode::SetPlaylistItem,
@@ -103,10 +113,25 @@ impl<'a> FCastSession<'a> {
         }
 
         let msg: VersionMessage =
-            serde_json::from_str(&body.ok_or("Version messages required body".to_owned())?)?;
+            serde_json::from_str(&body.ok_or("Version requires body".to_owned())?)?;
 
         if msg.version == 3 {
-            todo!("Send/recv initial message");
+            let initial = v3::InitialSenderMessage {
+                display_name: None,
+                app_name: Some(env!("CARGO_PKG_NAME").to_owned()),
+                app_version: Some(env!("CARGO_PKG_VERSION").to_owned()),
+            };
+            session.send_message(Opcode::Initial, initial)?;
+            let (opcode, body) = session.read_packet()?;
+            if opcode != Opcode::Initial {
+                return Err(format!("Expected Opcode::Initial, got {opcode:?}").into());
+            }
+            let inital_receiver: v3::InitialReceiverMessage =
+                serde_json::from_str(&body.ok_or("InitialReceiverMessage requires body")?)?;
+            dbg!(inital_receiver);
+            session.state = SessionState::Connected(ProtoVersion::V3);
+        } else {
+            session.state = SessionState::Connected(ProtoVersion::V2);
         }
 
         Ok(session)
@@ -175,6 +200,32 @@ impl<'a> FCastSession<'a> {
         Ok(())
     }
 
+    pub fn subscribe(&mut self, event: v3::EventType) -> Result<(), Box<dyn std::error::Error>> {
+        if self.state != SessionState::Connected(ProtoVersion::V3) {
+            return Err(format!(
+                "Cannot subscribe to events in the current state ({:?})",
+                self.state
+            ).into());
+        }
+
+        let obj = match event {
+            v3::EventType::MediaItemStart => v3::EventSubscribeObject::MediaItemStart,
+            v3::EventType::MediaItemEnd => v3::EventSubscribeObject::MediaItemEnd,
+            v3::EventType::MediaItemChange => v3::EventSubscribeObject::MediaItemChanged,
+            v3::EventType::KeyDown => v3::EventSubscribeObject::KeyDown {
+                keys: v3::KeyNames::all(),
+            },
+            v3::EventType::KeyUp => v3::EventSubscribeObject::KeyUp {
+                keys: v3::KeyNames::all(),
+            },
+        };
+
+        self.send_message(
+            Opcode::SubscribeEvent,
+            v3::SubscribeEventMessage { event: obj },
+        )
+    }
+
     pub fn send_empty(&mut self, opcode: Opcode) -> Result<(), Box<dyn std::error::Error>> {
         let json = String::new();
         let data = json.as_bytes();
@@ -202,6 +253,46 @@ impl<'a> FCastSession<'a> {
         Ok(())
     }
 
+    pub fn send_play_message(
+        &mut self,
+        mime_type: String,
+        url: Option<String>,
+        content: Option<String>,
+        time: Option<f64>,
+        speed: Option<f64>,
+        headers: Option<HashMap<String, String>>,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        match self.state {
+            SessionState::Connected(ProtoVersion::V2) => {
+                let msg = v2::PlayMessage {
+                    container: mime_type,
+                    url,
+                    content,
+                    time,
+                    speed,
+                    headers,
+                };
+                self.send_message(Opcode::Play, msg)?;
+            }
+            SessionState::Connected(ProtoVersion::V3) => {
+                let msg = v3::PlayMessage {
+                    container: mime_type,
+                    url,
+                    content,
+                    time,
+                    volume: Some(1.0),
+                    speed,
+                    headers,
+                    metadata: None,
+                };
+                self.send_message(Opcode::Play, msg)?;
+            }
+            _ => return Err("invalid state for sending play message".into()),
+        }
+
+        Ok(())
+    }
+
     fn handle_packet(
         &mut self,
         opcode: Opcode,
@@ -267,6 +358,30 @@ impl<'a> FCastSession<'a> {
                 self.send_empty(Opcode::Pong)?;
                 println!("Sent pong");
             }
+            Opcode::PlayUpdate => {
+                if let Some(body_str) = body {
+                    if let Ok(play_update_msg) =
+                        serde_json::from_str::<v3::PlayUpdateMessage>(&body_str)
+                    {
+                        println!("Received play update {play_update_msg:?}");
+                    } else {
+                        println!("Received play update with malformed body.");
+                    }
+                } else {
+                    println!("Received play update with no body.");
+                }
+            }
+            Opcode::Event => {
+                if let Some(body_str) = body {
+                    if let Ok(event_msg) = serde_json::from_str::<v3::EventMessage>(&body_str) {
+                        println!("Received event {event_msg:?}");
+                    } else {
+                        println!("Received event with malformed body.");
+                    }
+                } else {
+                    println!("Received event with no body.");
+                }
+            }
             _ => {
                 println!("Error handling packet");
             }

senders/terminal/src/main.rs

@@ -1,4 +1,5 @@
 use clap::{App, Arg, SubCommand};
+use fcast::models::v3;
 use fcast::transport::WebSocket;
 use std::collections::HashMap;
 use std::net::IpAddr;
@@ -17,7 +18,6 @@ use url::Url;
 use fcast::fcastsession::Opcode;
 use fcast::{
     fcastsession::FCastSession,
-    models::v2::PlayMessage,
     models::{SeekMessage, SetSpeedMessage, SetVolumeMessage},
 };
 
@@ -59,6 +59,16 @@ fn run() -> Result<(), Box<dyn std::error::Error>> {
                 .required(false)
                 .takes_value(true),
         )
+        .arg(
+            Arg::with_name("subscribe")
+                .short('s')
+                .long("subscribe")
+                .value_name("SUBSCRIPTIONS")
+                .help("A comma separated list of events to subscribe to (e.g. MediaItemStart,KeyDown). \
+                       Available events: [MediaItemStart, MediaItemEnd, MediaItemChange, KeyDown, KeyUp]")
+                .required(false)
+                .takes_value(true),
+        )
         .subcommand(
             SubCommand::with_name("play")
                 .about("Play media")
@@ -213,6 +223,25 @@ fn run() -> Result<(), Box<dyn std::error::Error>> {
 
     println!("Connection established.");
 
+    if let Some(subscriptions) = matches.value_of("subscribe") {
+        let subs = subscriptions.split(',');
+        for sub in subs {
+            let event = match sub.to_lowercase().as_str() {
+                "mediaitemstart" => v3::EventType::MediaItemStart,
+                "mediaitemend" => v3::EventType::MediaItemEnd,
+                "mediaitemchange" => v3::EventType::MediaItemChange,
+                "keydown" => v3::EventType::KeyDown,
+                "keyup" => v3::EventType::KeyUp,
+                _ => {
+                    println!("Invalid event in subscriptions list: {sub}");
+                    continue;
+                }
+            };
+            session.subscribe(event)?;
+            println!("Subscribed to {event:?} events");
+        }
+    }
+
     let mut join_handle: Option<JoinHandle<Result<(), String>>> = None;
     if let Some(play_matches) = matches.subcommand_matches("play") {
         let file_path = play_matches.value_of("file");
@@ -257,7 +286,11 @@ fn run() -> Result<(), Box<dyn std::error::Error>> {
                 .collect::<HashMap<String, String>>()
         });
 
-        let mut play_message = if let Some(file_path) = file_path {
+        #[allow(unused_assignments)]
+        let mut url = None;
+        let mut content = None;
+
+        if let Some(file_path) = file_path {
             match local_ip {
                 Some(lip) => {
                     let running = Arc::new(AtomicBool::new(true));
@@ -274,36 +307,25 @@ fn run() -> Result<(), Box<dyn std::error::Error>> {
                     println!("Waiting for Ctrl+C...");
 
                     let result = host_file_and_get_url(&lip, file_path, &mime_type, &running)?;
-                    let url = result.0;
+                    url = Some(result.0);
                     join_handle = Some(result.1);
-
-                    PlayMessage::new(mime_type, Some(url), None, time, speed, headers)
                 }
                 _ => return Err("Local IP was not able to be resolved.".into()),
             }
         } else {
-            PlayMessage::new(
+            url = play_matches.value_of("url").map(|s| s.to_owned());
-                mime_type,
+            content = play_matches.value_of("content").map(|s| s.to_owned());
-                play_matches.value_of("url").map(|s| s.to_owned()),
+        }
-                play_matches.value_of("content").map(|s| s.to_owned()),
-                time,
-                speed,
-                headers,
-            )
-        };
 
-        if play_message.content.is_none() && play_message.url.is_none() {
+        if content.is_none() && url.is_none() {
             println!("Reading content from stdin...");
 
             let mut buffer = String::new();
             std::io::stdin().read_to_string(&mut buffer)?;
-            play_message.content = Some(buffer);
+            content = Some(buffer);
         }
 
-        let json = serde_json::to_string(&play_message);
+        session.send_play_message(mime_type, url, content, time, speed, headers)?;
-        println!("Sent play {:?}", json);
-
-        session.send_message(Opcode::Play, &play_message)?;
     } else if let Some(seek_matches) = matches.subcommand_matches("seek") {
         let seek_message = SeekMessage::new(match seek_matches.value_of("timestamp") {
             Some(s) => s.parse::<f64>()?,

senders/terminal/src/models/v3.rs

@@ -218,6 +218,18 @@ pub enum KeyNames {
     Enter,
 }
 
+impl KeyNames {
+    pub fn all() -> Vec<String> {
+        vec![
+            "ArrowLeft".to_owned(),
+            "ArrowRight".to_owned(),
+            "ArrowUp".to_owned(),
+            "ArrowDown".to_owned(),
+            "Enter".to_owned(),
+        ]
+    }
+}
+
 #[derive(Debug, PartialEq)]
 pub enum EventSubscribeObject {
     MediaItemStart,
@@ -292,14 +304,14 @@ impl<'de> Deserialize<'de> for EventSubscribeObject {
     }
 }
 
-#[derive(Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct SubscribeEventMessage {
-    event: EventSubscribeObject,
+    pub event: EventSubscribeObject,
 }
 
-#[derive(Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct UnsubscribeEventMessage {
-    event: EventSubscribeObject,
+    pub event: EventSubscribeObject,
 }
 
 #[derive(Debug, PartialEq, Copy, Clone)]