277 lines
9.3 KiB
C#
277 lines
9.3 KiB
C#
using System.Threading.Channels;
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using Microsoft.Extensions.Options;
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using SpaceGame.Simulation.Api.Contracts;
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namespace SpaceGame.Simulation.Api.Simulation;
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public sealed class WorldService(
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IWebHostEnvironment environment,
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IOptions<WorldGenerationOptions> worldGenerationOptions,
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IOptions<OrbitalSimulationOptions> orbitalSimulationOptions)
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{
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private const int DeltaHistoryLimit = 256;
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private readonly object _sync = new();
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private readonly OrbitalSimulationSnapshot _orbitalSimulation = new(orbitalSimulationOptions.Value.SimulatedSecondsPerRealSecond);
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private readonly ScenarioLoader _loader = new(environment.ContentRootPath, worldGenerationOptions.Value);
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private readonly SimulationEngine _engine = new(orbitalSimulationOptions.Value);
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private readonly Dictionary<Guid, SubscriptionState> _subscribers = [];
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private readonly Queue<WorldDelta> _history = [];
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private SimulationWorld _world = new ScenarioLoader(environment.ContentRootPath, worldGenerationOptions.Value).Load();
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private long _sequence;
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public WorldSnapshot GetSnapshot()
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{
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lock (_sync)
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{
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return _engine.BuildSnapshot(_world, _sequence);
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}
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}
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public (long Sequence, DateTimeOffset GeneratedAtUtc) GetStatus()
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{
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lock (_sync)
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{
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return (_sequence, _world.GeneratedAtUtc);
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}
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}
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public ChannelReader<WorldDelta> Subscribe(ObserverScope scope, long afterSequence, CancellationToken cancellationToken)
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{
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var channel = Channel.CreateUnbounded<WorldDelta>(new UnboundedChannelOptions
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{
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SingleReader = true,
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SingleWriter = false,
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});
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Guid subscriberId;
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lock (_sync)
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{
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subscriberId = Guid.NewGuid();
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_subscribers.Add(subscriberId, new SubscriptionState(scope, channel));
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foreach (var delta in _history.Where((candidate) => candidate.Sequence > afterSequence))
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{
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var filtered = FilterDeltaForScope(delta, scope);
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if (HasMeaningfulDelta(filtered))
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{
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channel.Writer.TryWrite(filtered);
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}
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}
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}
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cancellationToken.Register(() => Unsubscribe(subscriberId));
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return channel.Reader;
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}
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public void Tick(float deltaSeconds)
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{
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WorldDelta? delta = null;
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lock (_sync)
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{
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delta = _engine.Tick(_world, deltaSeconds, ++_sequence);
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if (!HasMeaningfulDelta(delta))
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{
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return;
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}
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_history.Enqueue(delta);
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while (_history.Count > DeltaHistoryLimit)
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{
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_history.Dequeue();
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}
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foreach (var subscriber in _subscribers.Values.ToList())
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{
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var filtered = FilterDeltaForScope(delta, subscriber.Scope);
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if (HasMeaningfulDelta(filtered))
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{
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subscriber.Channel.Writer.TryWrite(filtered);
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}
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}
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}
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}
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public WorldSnapshot Reset()
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{
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lock (_sync)
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{
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_world = _loader.Load();
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_sequence += 1;
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_history.Clear();
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var resetDelta = new WorldDelta(
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_sequence,
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_world.TickIntervalMs,
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_world.OrbitalTimeSeconds,
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_orbitalSimulation,
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DateTimeOffset.UtcNow,
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true,
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[new SimulationEventRecord("world", "world", "reset", "World reset requested", DateTimeOffset.UtcNow, "world", "universe", "world")],
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[],
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[],
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[],
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[],
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[],
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[],
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[],
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[],
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[]);
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_history.Enqueue(resetDelta);
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foreach (var subscriber in _subscribers.Values.ToList())
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{
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subscriber.Channel.Writer.TryWrite(FilterDeltaForScope(resetDelta, subscriber.Scope));
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}
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return _engine.BuildSnapshot(_world, _sequence);
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}
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}
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private static bool HasMeaningfulDelta(WorldDelta delta) =>
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delta.RequiresSnapshotRefresh
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|| delta.Events.Count > 0
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|| delta.Celestials.Count > 0
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|| delta.Nodes.Count > 0
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|| delta.Stations.Count > 0
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|| delta.Claims.Count > 0
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|| delta.ConstructionSites.Count > 0
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|| delta.MarketOrders.Count > 0
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|| delta.Policies.Count > 0
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|| delta.Ships.Count > 0
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|| delta.Factions.Count > 0;
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private void Unsubscribe(Guid subscriberId)
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{
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lock (_sync)
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{
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if (!_subscribers.Remove(subscriberId, out var subscription))
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{
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return;
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}
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subscription.Channel.Writer.TryComplete();
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}
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}
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private WorldDelta FilterDeltaForScope(WorldDelta delta, ObserverScope scope)
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{
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if (string.Equals(scope.ScopeKind, "universe", StringComparison.OrdinalIgnoreCase))
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{
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return delta with
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{
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Events = delta.Events.Select((evt) => EnrichEventScope(evt)).ToList(),
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Scope = scope,
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};
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}
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var systemFilter = scope.SystemId;
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if (string.Equals(scope.ScopeKind, "local-celestial", StringComparison.OrdinalIgnoreCase) && systemFilter is null && scope.CelestialId is not null)
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{
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systemFilter = ResolveCelestialSystemId(scope.CelestialId);
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}
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return delta with
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{
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Events = delta.Events
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.Select((evt) => EnrichEventScope(evt))
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.Where((evt) => IsEventVisibleToScope(evt, scope, systemFilter))
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.ToList(),
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Celestials = delta.Celestials.Where((celestial) => systemFilter is null || celestial.SystemId == systemFilter).ToList(),
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Nodes = delta.Nodes.Where((node) => systemFilter is null || node.SystemId == systemFilter).ToList(),
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Stations = delta.Stations.Where((station) => systemFilter is null || station.SystemId == systemFilter).ToList(),
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Claims = delta.Claims.Where((claim) => systemFilter is null || claim.SystemId == systemFilter).ToList(),
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ConstructionSites = delta.ConstructionSites.Where((site) => systemFilter is null || site.SystemId == systemFilter).ToList(),
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MarketOrders = delta.MarketOrders.Where((order) => IsOrderVisibleToScope(order, systemFilter)).ToList(),
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Policies = string.Equals(scope.ScopeKind, "universe", StringComparison.OrdinalIgnoreCase) ? delta.Policies : [],
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Ships = delta.Ships.Where((ship) => systemFilter is null || ship.SystemId == systemFilter).ToList(),
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Factions = string.Equals(scope.ScopeKind, "universe", StringComparison.OrdinalIgnoreCase) ? delta.Factions : [],
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Scope = scope,
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};
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}
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private SimulationEventRecord EnrichEventScope(SimulationEventRecord evt)
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{
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if (!string.Equals(evt.ScopeKind, "universe", StringComparison.OrdinalIgnoreCase) || evt.ScopeEntityId is not null)
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{
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return evt;
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}
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return evt.EntityKind switch
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{
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"ship" => WithEntityScope(evt, "system", _world.Ships.FirstOrDefault((ship) => ship.Id == evt.EntityId)?.SystemId),
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"station" => WithEntityScope(evt, "system", _world.Stations.FirstOrDefault((station) => station.Id == evt.EntityId)?.SystemId),
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"node" => WithEntityScope(evt, "system", _world.Nodes.FirstOrDefault((node) => node.Id == evt.EntityId)?.SystemId),
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"celestial" => WithEntityScope(evt, "system", _world.Celestials.FirstOrDefault((c) => c.Id == evt.EntityId)?.SystemId),
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"claim" => WithEntityScope(evt, "system", _world.Claims.FirstOrDefault((claim) => claim.Id == evt.EntityId)?.SystemId),
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"construction-site" => WithEntityScope(evt, "system", _world.ConstructionSites.FirstOrDefault((site) => site.Id == evt.EntityId)?.SystemId),
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"market-order" => WithEntityScope(evt, "system", ResolveMarketOrderSystemId(evt.EntityId)),
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_ => evt,
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};
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}
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private static SimulationEventRecord WithEntityScope(SimulationEventRecord evt, string scopeKind, string? scopeEntityId) =>
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evt with
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{
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Family = evt.Kind.Contains("power", StringComparison.Ordinal) ? "power" :
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evt.Kind.Contains("construction", StringComparison.Ordinal) ? "construction" :
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evt.Kind.Contains("population", StringComparison.Ordinal) ? "population" :
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evt.Kind.Contains("claim", StringComparison.Ordinal) ? "claim" :
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"simulation",
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ScopeKind = scopeKind,
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ScopeEntityId = scopeEntityId,
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};
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private string? ResolveCelestialSystemId(string celestialId) =>
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_world.Celestials.FirstOrDefault((c) => c.Id == celestialId)?.SystemId;
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private string? ResolveMarketOrderSystemId(string orderId)
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{
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var order = _world.MarketOrders.FirstOrDefault((candidate) => candidate.Id == orderId);
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if (order?.StationId is not null)
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{
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return _world.Stations.FirstOrDefault((station) => station.Id == order.StationId)?.SystemId;
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}
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if (order?.ConstructionSiteId is not null)
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{
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return _world.ConstructionSites.FirstOrDefault((site) => site.Id == order.ConstructionSiteId)?.SystemId;
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}
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return null;
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}
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private bool IsOrderVisibleToScope(MarketOrderDelta order, string? systemFilter)
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{
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if (systemFilter is null)
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{
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return true;
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}
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if (order.StationId is not null)
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{
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return _world.Stations.Any((station) => station.Id == order.StationId && station.SystemId == systemFilter);
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}
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if (order.ConstructionSiteId is not null)
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{
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return _world.ConstructionSites.Any((site) => site.Id == order.ConstructionSiteId && site.SystemId == systemFilter);
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}
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return false;
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}
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private static bool IsEventVisibleToScope(SimulationEventRecord evt, ObserverScope scope, string? systemFilter)
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{
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return scope.ScopeKind switch
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{
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"universe" => true,
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"system" => evt.ScopeKind == "universe" || evt.ScopeEntityId == systemFilter,
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"local-celestial" => evt.ScopeKind == "universe" || evt.ScopeEntityId == systemFilter,
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_ => true,
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};
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}
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private sealed record SubscriptionState(ObserverScope Scope, Channel<WorldDelta> Channel);
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}
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