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[backend/core] Switch to ConcurrentDictionary for ContextCache, Separate ContextCache from PreloadedContexts, limit ContextCache to 20 entries (ISH-166)

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Laura Hausmann 2024-03-11 04:28:03 +01:00
parent be65176d29
commit a8d68ac1e6
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1 changed files with 17 additions and 3 deletions
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20
Iceshrimp.Backend/Core/Federation/ActivityStreams/LDHelpers.cs
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@ -1,3 +1,4 @@
using System.Collections.Concurrent;
using Iceshrimp.Backend.Core.Configuration;
using Iceshrimp.Backend.Core.Database.Tables;
using Iceshrimp.Backend.Core.Federation.ActivityStreams.Types;
@ -11,7 +12,7 @@ namespace Iceshrimp.Backend.Core.Federation.ActivityStreams;
public static class LdHelpers
{
private static readonly Dictionary<string, RemoteDocument> ContextCache = new()
private static readonly Dictionary<string, RemoteDocument> PreloadedContexts = new()
{
{
"https://www.w3.org/ns/activitystreams", new RemoteDocument
@ -52,6 +53,8 @@ public static class LdHelpers
}
};
private static readonly ConcurrentDictionary<string, RemoteDocument> ContextCache = new();
private static readonly JToken DefaultContext =
JToken.Parse(File.ReadAllText(Path.Combine("Core", "Federation", "ActivityStreams", "Contexts",
"default.json")));
@ -88,7 +91,9 @@ public static class LdHelpers
private static RemoteDocument CustomLoader(Uri uri, JsonLdLoaderOptions jsonLdLoaderOptions)
{
var key = uri.AbsolutePath == "/schemas/litepub-0.1.jsonld" ? "litepub-0.1" : uri.ToString();
ContextCache.TryGetValue(key, out var result);
if (!PreloadedContexts.TryGetValue(key, out var result))
ContextCache.TryGetValue(key, out result);
if (result != null)
{
result.ContextUrl = uri;
@ -97,7 +102,16 @@ public static class LdHelpers
//TODO: cache in redis
result = DefaultDocumentLoader.LoadJson(uri, jsonLdLoaderOptions);
ContextCache.Add(uri.ToString(), result);
ContextCache.TryAdd(uri.ToString(), result);
// Cleanup to make sure this doesn't take up more and more memory
while (ContextCache.Count > 20)
{
var hit = ContextCache.Keys.FirstOrDefault();
if (hit == null) break;
var success = ContextCache.TryRemove(hit, out _);
if (!success) break;
}
return result;
}