+const no_team = { name: "" };
+
/* A single player can have multiple connections, (think, multiple
* browser windows with a common session cookie). */
class Player {
this.session_id = session_id;
this.name = name;
this.connections = [connection];
- this.team = "";
+ this.team = no_team;
+ this.active = true;
}
add_connection(connection) {
/* Returns the number of remaining connections after this one is removed. */
remove_connection(connection) {
- this.connections.filter(c => c !== connection);
+ this.connections = this.connections.filter(c => c !== connection);
return this.connections.length;
}
return JSON.stringify({
id: this.id,
name: this.name,
- team: this.team
+ team: this.team.name,
+ score: this.score
});
}
}
+/* This replacer function allows for JSON.stringify to give results
+ * for objects of various types that are used in game state.
+ */
+function stringify_replacer(key, value) {
+ if (typeof value === 'object' && value instanceof Set) {
+ return [...value];
+ }
+ return value;
+}
+
/* Base class providing common code for game engine implementations. */
class Game {
constructor(id) {
this.next_player_id = 1;
this.teams = [];
this.state = {
- team_to_play: ""
+ team_to_play: no_team
};
this.first_move = true;
}
/* Cannot move if you are not on a team. */
- if (player.team === "")
+ if (player.team === no_team)
{
return { legal: false,
message: "You must be on a team to take a turn" };
* Return true if assignment made, false otherwise. */
assign_player_to_team_perhaps(player, team)
{
- if (player.team !== "")
+ if (player.team !== no_team)
return false;
player.team = team;
/* Yes, start at 1 to skip teams[0] which we just assigned. */
for (let i = 1; i < this.teams.length; i++) {
- const other = this.players.find(p => p !== player && p.team === "");
+ const other = this.players.find(p => (p !== player) && (p.team === no_team));
if (!other)
return;
this.assign_player_to_team_perhaps(other, this.teams[i]);
/* No existing player. Add a new one. */
const id = this.next_player_id;
- const player = new Player(id, session.id, session.nickname, connection);
+ let nickname = session.nickname;
+ if (nickname === "")
+ nickname = "Guest";
+ const nickname_orig = nickname;
+
+ /* Ensure we don't have a name collision with a previous player. */
+ let unique_suffix = 1;
+ while (this.players.find(player => player.name === nickname))
+ {
+ nickname = `${nickname_orig}${unique_suffix.toString().padStart(2, '0')}`;
+ unique_suffix++;
+ }
+
+ const player = new Player(id, session.id, nickname, connection);
/* Broadcast before adding player to list (to avoid announcing the
* new player to itself). */
this.players_by_session[session.id] = player;
this.next_player_id++;
+ /* After adding the player to the list, and if we are already past
+ * the first move, assign this player to the first team that
+ * doesn't already have a player assigned (if any). */
+ if (! this.first_move) {
+ const have_players = Array(this.teams.length).fill(false);
+ this.players.forEach(p => {
+ if (p.team.id !== undefined)
+ have_players[p.team.id] = true;
+ });
+ const first_empty = have_players.findIndex(i => i === false);
+ this.assign_player_to_team_perhaps(player, this.teams[first_empty]);
+ }
+
return player;
}
remove_player_connection(player, connection) {
const remaining = player.remove_connection(connection);
if (remaining === 0) {
+ player.active = false;
const player_data = JSON.stringify({ id: player.id });
- this.players.filter(p => p !== player);
- delete this.players_by_session[player.session_id];
this.broadcast_event("player-exit", player_data);
}
}
this.broadcast_string(`event: ${type}\ndata: ${data}\n`);
}
+ broadcast_event_object(type, obj) {
+ this.broadcast_event(type, JSON.stringify(obj));
+ }
+
handle_events(request, response) {
/* These headers will keep the connection open so we can stream events. */
const headers = {
/* And the player-info event. */
response.write(`event: player-info\ndata: ${player.info_json()}\n\n`);
- /* As well as player-enter events for all existing players. */
- this.players.filter(p => p !== player).forEach(p => {
+ /* As well as player-enter events for all existing, active players. */
+ this.players.filter(p => p !== player && p.active).forEach(p => {
response.write(`event: player-enter\ndata: ${p.info_json()}\n\n`);
});
/* Finally, if this game class has a "state" property, stream that
* current state to the client. */
if (this.state) {
- const state_json = JSON.stringify(this.state);
+ const state_json = JSON.stringify(this.state, stringify_replacer);
response.write(`event: game-state\ndata: ${state_json}\n\n`);
}
}
handle_player(request, response) {
const player = this.players_by_session[request.session.id];
const name = request.body.name;
- const team = request.body.team;
+ const team_name = request.body.team;
var updated = false;
if (! player) {
response.sendStatus(404);
updated = true;
}
- if (team !== null && (player.team !== team) &&
- (team === "" || this.teams.includes(team)))
+ if (team_name !== null && (player.team.name !== team_name))
{
- player.team = team;
-
- updated = true;
+ if (team_name === "") {
+ player.team = no_team;
+ updated = true;
+ } else {
+ const index = this.teams.findIndex(t => t.name === team_name);
+ if (index >= 0) {
+ player.team = this.teams[index];
+ updated = true;
+ }
+ }
}
if (updated)
}
broadcast_move(move) {
- this.broadcast_event("move", move);
+ this.broadcast_event("move", JSON.stringify(move));
}
}
projects / empires-server / blobdiff