3 files changed, 98 insertions, 8 deletions
diff --git a/src/SMAPI.Web/Framework/Caching/Mods/IModCacheRepository.cs b/src/SMAPI.Web/Framework/Caching/Mods/IModCacheRepository.cs
index bcec8b36..08749f3b 100644
--- a/src/SMAPI.Web/Framework/Caching/Mods/IModCacheRepository.cs
+++ b/src/SMAPI.Web/Framework/Caching/Mods/IModCacheRepository.cs
@@ -4,7 +4,7 @@ using StardewModdingAPI.Web.Framework.ModRepositories;
 
 namespace StardewModdingAPI.Web.Framework.Caching.Mods
 {
-    /// <summary>Encapsulates logic for accessing the mod data cache.</summary>
+    /// <summary>Manages cached mod data.</summary>
     internal interface IModCacheRepository : ICacheRepository
     {
         /*********
diff --git a/src/SMAPI.Web/Framework/Caching/Mods/ModCacheMemoryRepository.cs b/src/SMAPI.Web/Framework/Caching/Mods/ModCacheMemoryRepository.cs
new file mode 100644
index 00000000..9c5a217e
--- /dev/null
+++ b/src/SMAPI.Web/Framework/Caching/Mods/ModCacheMemoryRepository.cs
@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using StardewModdingAPI.Toolkit.Framework.UpdateData;
+using StardewModdingAPI.Web.Framework.ModRepositories;
+
+namespace StardewModdingAPI.Web.Framework.Caching.Mods
+{
+    /// <summary>Manages cached mod data in-memory.</summary>
+    internal class ModCacheMemoryRepository : BaseCacheRepository, IModCacheRepository
+    {
+        /*********
+        ** Fields
+        *********/
+        /// <summary>The cached mod data indexed by <c>{site key}:{ID}</c>.</summary>
+        private readonly IDictionary<string, CachedMod> Mods = new Dictionary<string, CachedMod>(StringComparer.InvariantCultureIgnoreCase);
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Get the cached mod data.</summary>
+        /// <param name="site">The mod site to search.</param>
+        /// <param name="id">The mod's unique ID within the <paramref name="site"/>.</param>
+        /// <param name="mod">The fetched mod.</param>
+        /// <param name="markRequested">Whether to update the mod's 'last requested' date.</param>
+        public bool TryGetMod(ModRepositoryKey site, string id, out CachedMod mod, bool markRequested = true)
+        {
+            // get mod
+            if (!this.Mods.TryGetValue(this.GetKey(site, id), out mod))
+                return false;
+
+            // bump 'last requested'
+            if (markRequested)
+            {
+                mod.LastRequested = DateTimeOffset.UtcNow;
+                mod = this.SaveMod(mod);
+            }
+
+            return true;
+        }
+
+        /// <summary>Save data fetched for a mod.</summary>
+        /// <param name="site">The mod site on which the mod is found.</param>
+        /// <param name="id">The mod's unique ID within the <paramref name="site"/>.</param>
+        /// <param name="mod">The mod data.</param>
+        /// <param name="cachedMod">The stored mod record.</param>
+        public void SaveMod(ModRepositoryKey site, string id, ModInfoModel mod, out CachedMod cachedMod)
+        {
+            string key = this.GetKey(site, id);
+            cachedMod = this.SaveMod(new CachedMod(site, id, mod));
+        }
+
+        /// <summary>Delete data for mods which haven't been requested within a given time limit.</summary>
+        /// <param name="age">The minimum age for which to remove mods.</param>
+        public void RemoveStaleMods(TimeSpan age)
+        {
+            DateTimeOffset minDate = DateTimeOffset.UtcNow.Subtract(age);
+
+            string[] staleKeys = this.Mods
+                .Where(p => p.Value.LastRequested < minDate)
+                .Select(p => p.Key)
+                .ToArray();
+
+            foreach (string key in staleKeys)
+                this.Mods.Remove(key);
+        }
+
+        /// <summary>Save data fetched for a mod.</summary>
+        /// <param name="mod">The mod data.</param>
+        public CachedMod SaveMod(CachedMod mod)
+        {
+            string key = this.GetKey(mod.Site, mod.ID);
+            return this.Mods[key] = mod;
+        }
+
+
+        /*********
+        ** Private methods
+        *********/
+        /// <summary>Get a cache key.</summary>
+        /// <param name="site">The mod site.</param>
+        /// <param name="id">The mod ID.</param>
+        public string GetKey(ModRepositoryKey site, string id)
+        {
+            return $"{site}:{id.Trim()}".ToLower();
+        }
+    }
+}
diff --git a/src/SMAPI.Web/Framework/Caching/Mods/ModCacheRepository.cs b/src/SMAPI.Web/Framework/Caching/Mods/ModCacheMongoRepository.cs
index 6ba1d73d..f105baab 100644
--- a/src/SMAPI.Web/Framework/Caching/Mods/ModCacheRepository.cs
+++ b/src/SMAPI.Web/Framework/Caching/Mods/ModCacheMongoRepository.cs
@@ -5,8 +5,8 @@ using StardewModdingAPI.Web.Framework.ModRepositories;
 
 namespace StardewModdingAPI.Web.Framework.Caching.Mods
 {
-    /// <summary>Encapsulates logic for accessing the mod data cache.</summary>
-    internal class ModCacheRepository : BaseCacheRepository, IModCacheRepository
+    /// <summary>Manages cached mod data in MongoDB.</summary>
+    internal class ModCacheMongoRepository : BaseCacheRepository, IModCacheRepository
     {
         /*********
         ** Fields
@@ -20,7 +20,7 @@ namespace StardewModdingAPI.Web.Framework.Caching.Mods
         *********/
         /// <summary>Construct an instance.</summary>
         /// <param name="database">The authenticated MongoDB database.</param>
-        public ModCacheRepository(IMongoDatabase database)
+        public ModCacheMongoRepository(IMongoDatabase database)
         {
             // get collections
             this.Mods = database.GetCollection<CachedMod>("mods");
@@ -29,6 +29,7 @@ namespace StardewModdingAPI.Web.Framework.Caching.Mods
             this.Mods.Indexes.CreateOne(new CreateIndexModel<CachedMod>(Builders<CachedMod>.IndexKeys.Ascending(p => p.ID).Ascending(p => p.Site)));
         }
 
+
         /*********
         ** Public methods
         *********/
@@ -75,10 +76,6 @@ namespace StardewModdingAPI.Web.Framework.Caching.Mods
             this.Mods.DeleteMany(p => p.LastRequested < minDate);
         }
 
-
-        /*********
-        ** Private methods
-        *********/
         /// <summary>Save data fetched for a mod.</summary>
         /// <param name="mod">The mod data.</param>
         public CachedMod SaveMod(CachedMod mod)
@@ -94,6 +91,10 @@ namespace StardewModdingAPI.Web.Framework.Caching.Mods
             return mod;
         }
 
+
+        /*********
+        ** Private methods
+        *********/
         /// <summary>Normalize a mod ID for case-insensitive search.</summary>
         /// <param name="id">The mod ID.</param>
         public string NormalizeId(string id)