Merge pull request #59 from moreal/tip

feat(api): provide tip index

Mimir/Controllers/MetadataController.cs

@@ -0,0 +1,19 @@
+using Microsoft.AspNetCore.Mvc;
+using Mimir.Models.Metadata;
+using Mimir.Repositories;
+
+namespace Mimir.Controllers;
+
+[ApiController]
+[Route("{network}")]
+public class MetadataController : ControllerBase
+{
+    [HttpGet("tip")]
+    public async Task<GetTipResponse> GetTip(
+        string network,
+        MetadataRepository metadataRepository
+    )
+    {
+        return new GetTipResponse(await metadataRepository.GetLatestBlockIndex(network));
+    }
+}

Mimir/Models/Metadata/GetTipResponse.cs

@@ -0,0 +1,5 @@
+namespace Mimir.Models.Metadata;
+
+public record GetTipResponse(
+    long Index
+);

Mimir/Program.cs

@@ -27,6 +27,7 @@
 builder.Services.AddSingleton<ArenaRankingRepository>();
 builder.Services.AddSingleton<TableSheetsRepository>();
 builder.Services.AddSingleton<AvatarRepository>();
+builder.Services.AddSingleton<MetadataRepository>();
 builder.Services.AddControllers();
 builder.Services.AddHeadlessGQLClient()
     .ConfigureHttpClient((provider, client) =>

Mimir/Repositories/MetadataRepository.cs

@@ -0,0 +1,26 @@
+using Mimir.Models.Avatar;
+using Mimir.Services;
+using MongoDB.Bson;
+using MongoDB.Driver;
+
+namespace Mimir.Repositories;
+
+public class MetadataRepository : BaseRepository<BsonDocument>
+{
+    public MetadataRepository(MongoDBCollectionService mongoDBCollectionService)
+        : base(mongoDBCollectionService)
+    {
+    }
+
+    protected override string GetCollectionName()
+    {
+        return "metadata";
+    }
+
+    public async Task<long> GetLatestBlockIndex(string network)
+    {
+        var filter = Builders<BsonDocument>.Filter.Eq("_id", "SyncContext");
+        var doc = await GetCollection(network).FindSync(filter).FirstAsync();
+        return doc.GetValue("LatestBlockIndex").AsInt64;
+    }
+}