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fix: make subscriber functionality thread-safe

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This commit is contained in:
Andrew Welker
2025-11-03 15:13:48 -06:00
parent a782b57100
commit 35371dde22
1 changed files with 32 additions and 9 deletions
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41
src/PepperDash.Essentials.MobileControl.Messengers/Messengers/MessengerBase.cs
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@@ -33,6 +33,11 @@ namespace PepperDash.Essentials.AppServer.Messengers
/// </remarks>
protected HashSet<string> SubscriberIds = new HashSet<string>();
/// <summary>
/// Lock object for thread-safe access to SubscriberIds
/// </summary>
private readonly object _subscriberLock = new object();
private readonly List<string> _deviceInterfaces;
private readonly Dictionary<string, Action<string, JToken>> _actions = new Dictionary<string, Action<string, JToken>>();
@@ -193,13 +198,16 @@ namespace PepperDash.Essentials.AppServer.Messengers
return;
}
if (SubscriberIds.Any(id => id == clientId))
lock (_subscriberLock)
{
this.LogVerbose("Client {clientId} already subscribed", clientId);
return;
}
if (SubscriberIds.Contains(clientId))
{
this.LogVerbose("Client {clientId} already subscribed", clientId);
return;
}
SubscriberIds.Add(clientId);
SubscriberIds.Add(clientId);
}
this.LogDebug("Client {clientId} subscribed", clientId);
}
@@ -216,14 +224,22 @@ namespace PepperDash.Essentials.AppServer.Messengers
return;
}
if (!SubscriberIds.Any(i => i == clientId))
bool wasSubscribed;
lock (_subscriberLock)
{
wasSubscribed = SubscriberIds.Contains(clientId);
if (wasSubscribed)
{
SubscriberIds.Remove(clientId);
}
}
if (!wasSubscribed)
{
this.LogVerbose("Client with ID {clientId} is not subscribed", clientId);
return;
}
SubscriberIds.RemoveWhere((i) => i == clientId);
this.LogInformation("Client with ID {clientId} unsubscribed", clientId);
}
@@ -312,7 +328,14 @@ namespace PepperDash.Essentials.AppServer.Messengers
// If client is null or empty, this message is unsolicited feedback. Iterate through the subscriber list and send to all interested parties
if (string.IsNullOrEmpty(clientId))
{
foreach (var client in SubscriberIds)
// Create a snapshot of subscribers to avoid collection modification during iteration
List<string> subscriberSnapshot;
lock (_subscriberLock)
{
subscriberSnapshot = new List<string>(SubscriberIds);
}
foreach (var client in subscriberSnapshot)
{
AppServerController?.SendMessageObject(new MobileControlMessage { Type = !string.IsNullOrEmpty(type) ? type : MessagePath, ClientId = client, Content = content });
}