1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

#![allow(missing_docs)]

use super::online::{
    MatchmakerConnectionState, OnlineMatchmakerRequest, OnlineMatchmakerResponse,
    READ_TO_END_BYTE_COUNT,
};
use crate::{
    networking::{socket::establish_peer_connections, NetworkMatchSocket},
    prelude::*,
    utils::BiChannelServer,
};
use bones_matchmaker_proto::{MatchInfo, MatchmakerRequest, MatchmakerResponse};
use std::sync::Arc;
use tracing::{info, warn};

/// Resolves the search for a match by sending a matchmaking request and handling responses.
pub(crate) async fn resolve_search_for_match(
    matchmaker_channel: &BiChannelServer<OnlineMatchmakerRequest, OnlineMatchmakerResponse>,
    matchmaker_connection_state: &mut MatchmakerConnectionState,
    match_info: MatchInfo,
) -> anyhow::Result<()> {
    let conn = matchmaker_connection_state.acquire_connection().await?;
    let (mut send, mut recv) = conn.open_bi().await?;

    // Send a matchmaking request to the server
    let message = MatchmakerRequest::RequestMatchmaking(match_info.clone());
    info!(request=?message, "Resolve: Sending match request");
    let message = postcard::to_allocvec(&message)?;
    send.write_all(&message).await?;
    send.finish()?;
    send.stopped().await?;

    let res = recv.read_to_end(READ_TO_END_BYTE_COUNT).await?;
    let _response: MatchmakerResponse = postcard::from_bytes(&res)?;

    loop {
        tokio::select! {
            message = matchmaker_channel.recv() => {
                match message {
                    Ok(OnlineMatchmakerRequest::StopSearch { .. }) => {
                        if let Err(err) = resolve_stop_search_for_match(
                            matchmaker_channel,
                            matchmaker_connection_state,
                            match_info.clone(),
                        ).await {
                            warn!("Error stopping matchmaking: {:?}", err);
                        }
                        return Ok(());
                    }
                    Ok(other) => {
                        warn!("Unexpected request during matchmaking: {:?}", other);
                    }
                    Err(err) => {
                        anyhow::bail!("Failed to recv from match maker channel: {err:?}");
                    }
                }
            }
            recv = conn.accept_uni() => {
                let mut recv = recv?;
                let message = recv.read_to_end(5 * 1024).await?;
                let message: MatchmakerResponse = postcard::from_bytes(&message)?;

                match message {
                    MatchmakerResponse::MatchmakingUpdate{ player_count } => {
                        info!("Online matchmaking updated player count: {player_count}");
                        matchmaker_channel.try_send(OnlineMatchmakerResponse::MatchmakingUpdate{ player_count })?;
                    }
                    MatchmakerResponse::Success {
                        random_seed,
                        player_idx,
                        player_count,
                        player_ids,
                    } => {
                        info!(%random_seed, %player_idx, player_count=%player_count, "Online match starting");

                        let peer_connections = establish_peer_connections(
                            player_idx,
                            player_count,
                            player_ids,
                            None,
                        )
                        .await?;

                        let socket = super::socket::Socket::new(player_idx, peer_connections);

                        matchmaker_channel.try_send(OnlineMatchmakerResponse::GameStarting {
                            socket: NetworkMatchSocket(Arc::new(socket)),
                            player_idx: player_idx as _,
                            player_count: player_count as _,
                            random_seed
                        })?;

                        matchmaker_connection_state.close_connection();
                        return Ok(());
                    }
                    other => anyhow::bail!("Unexpected message from matchmaker: {other:?}"),
                }
            }
        }
    }
}

/// Resolves the stop search for a match by sending a stop matchmaking request and handling responses.
pub(crate) async fn resolve_stop_search_for_match(
    matchmaker_channel: &BiChannelServer<OnlineMatchmakerRequest, OnlineMatchmakerResponse>,
    matchmaker_connection_state: &mut MatchmakerConnectionState,
    match_info: MatchInfo,
) -> anyhow::Result<()> {
    let conn = matchmaker_connection_state.acquire_connection().await?;
    // Use the existing connection to send the stop request
    let (mut send, mut recv) = conn.open_bi().await?;

    let message = MatchmakerRequest::StopMatchmaking(match_info);
    info!(request=?message, "Sending stop matchmaking request");

    let message = postcard::to_allocvec(&message)?;
    send.write_all(&message).await?;
    send.finish()?;
    send.stopped().await?;

    let res = recv.read_to_end(READ_TO_END_BYTE_COUNT).await?;
    let response: MatchmakerResponse = postcard::from_bytes(&res)?;

    match response {
        MatchmakerResponse::Accepted => {
            matchmaker_channel
                .send(OnlineMatchmakerResponse::Error(
                    "Matchmaking stopped by user".to_string(),
                ))
                .await?;
        }
        MatchmakerResponse::Error(error) => {
            anyhow::bail!("Failed to stop matchmaking: {}", error);
        }
        _ => {
            anyhow::bail!("Unexpected response from matchmaker: {:?}", response);
        }
    }

    Ok(())
}