Backfill

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

// Runs on the DEDICATED SERVER build. Polls the authoritative roster and
// keeps a local admit-set the connection handler checks against.
public class BackfillRoster : MonoBehaviour
{
    // All injected into the server container at launch.
    string apiBase    = System.Environment.GetEnvironmentVariable("PLAYFLOW_API_URL")
                        ?? "https://api.computeflow.cloud/api";
    string instanceId = System.Environment.GetEnvironmentVariable("PLAYFLOW_INSTANCE_ID");
    string serverKey  = System.Environment.GetEnvironmentVariable("PLAYFLOW_API_KEY"); // pf_...

    long lastVersion = -1;
    readonly Dictionary<string, string> playerTeam = new(); // playerId -> team

    void Start() => StartCoroutine(PollLoop());

    IEnumerator PollLoop()
    {
        var wait = new WaitForSeconds(3f);
        while (true)
        {
            using var req = UnityWebRequest.Get($"{apiBase}/v3/servers/{instanceId}/roster");
            req.SetRequestHeader("api-key", serverKey);
            yield return req.SendWebRequest();

            if (req.result == UnityWebRequest.Result.Success)
            {
                var roster = JsonUtility.FromJson<RosterResponse>(req.downloadHandler.text);
                if (roster.roster_version != lastVersion)
                {
                    lastVersion = roster.roster_version;
                    playerTeam.Clear();
                    foreach (var e in roster.roster) playerTeam[e.playerId] = e.team;
                    Debug.Log($"Roster v{lastVersion}: {playerTeam.Count}/{roster.capacity} players");
                }
            }
            yield return wait;
        }
    }

    // Call this from your transport's connection-approval callback.
    public bool IsAdmitted(string playerId, out string team) =>
        playerTeam.TryGetValue(playerId, out team);
}

[System.Serializable] public class RosterEntry { public string playerId; public string team; public string lobbyId; public string joinedAt; }
[System.Serializable] public class RosterResponse { public string match_id; public int capacity; public int current_players; public long roster_version; public RosterEntry[] roster; }