Add synced user notes

2026-07-18 22:22:29 -05:00
parent a232e18c46
commit d0bb271b14
22 changed files with 930 additions and 2 deletions
@@ -0,0 +1,66 @@
+using MongoDB.Driver;
+using QuestionsApi.Models;
+
+namespace QuestionsApi.Services;
+
+public sealed record UserNotepadUpdateResult(UserNotepad? Note, UserNotepad? Current)
+{
+    public bool Succeeded => Note is not null;
+}
+
+public sealed class UserNotepadStore
+{
+    private readonly IMongoCollection<UserNotepad> _notes;
+
+    public UserNotepadStore(MongoDatabaseProvider mongo)
+    {
+        _notes = mongo.Database.GetCollection<UserNotepad>("UserNotepads");
+        _notes.Indexes.CreateOne(new CreateIndexModel<UserNotepad>(
+            Builders<UserNotepad>.IndexKeys.Ascending(note => note.UserId),
+            new CreateIndexOptions { Unique = true, Name = "user_notepad_unique_user" }));
+    }
+
+    public async Task<UserNotepad?> GetAsync(string userId) =>
+        await _notes.Find(note => note.UserId == userId).FirstOrDefaultAsync();
+
+    public async Task<UserNotepadUpdateResult> UpdateAsync(
+        string userId,
+        string content,
+        long expectedRevision)
+    {
+        var now = DateTime.UtcNow;
+        if (expectedRevision == 0)
+        {
+            var created = new UserNotepad
+            {
+                UserId = userId,
+                Content = content,
+                Revision = 1,
+                CreatedUtc = now,
+                UpdatedUtc = now
+            };
+            try
+            {
+                await _notes.InsertOneAsync(created);
+                return new UserNotepadUpdateResult(created, null);
+            }
+            catch (MongoWriteException exception) when (
+                exception.WriteError?.Category == ServerErrorCategory.DuplicateKey)
+            {
+                return new UserNotepadUpdateResult(null, await GetAsync(userId));
+            }
+        }
+
+        var updated = await _notes.FindOneAndUpdateAsync(
+            note => note.UserId == userId && note.Revision == expectedRevision,
+            Builders<UserNotepad>.Update
+                .Set(note => note.Content, content)
+                .Set(note => note.UpdatedUtc, now)
+                .Inc(note => note.Revision, 1),
+            new FindOneAndUpdateOptions<UserNotepad> { ReturnDocument = ReturnDocument.After });
+
+        return updated is not null
+            ? new UserNotepadUpdateResult(updated, null)
+            : new UserNotepadUpdateResult(null, await GetAsync(userId));
+    }
+}