rework static files server

MareSynchronosServer/MareSynchronosStaticFilesServer/GrpcFileService.cs

@@ -0,0 +1,94 @@
+using Grpc.Core;
+using MareSynchronosShared.Data;
+using MareSynchronosShared.Metrics;
+using MareSynchronosShared.Protos;
+using Microsoft.EntityFrameworkCore;
+
+namespace MareSynchronosStaticFilesServer;
+
+public class GrpcFileService : FileService.FileServiceBase
+{
+    private readonly string _basePath;
+    private readonly MareDbContext _mareDbContext;
+    private readonly ILogger<GrpcFileService> _logger;
+    private readonly MareMetrics _metricsClient;
+
+    public GrpcFileService(MareDbContext mareDbContext, IConfiguration configuration, ILogger<GrpcFileService> logger, MareMetrics metricsClient)
+    {
+        _basePath = configuration.GetRequiredSection("MareSynchronos")["CacheDirectory"];
+        _mareDbContext = mareDbContext;
+        _logger = logger;
+        _metricsClient = metricsClient;
+    }
+
+    public override async Task<Empty> UploadFile(IAsyncStreamReader<UploadFileRequest> requestStream, ServerCallContext context)
+    {
+        _ = await requestStream.MoveNext().ConfigureAwait(false);
+        var uploadMsg = requestStream.Current;
+        var filePath = FilePathUtil.GetFilePath(_basePath, uploadMsg.Hash);
+        using var fileWriter = File.OpenWrite(filePath);
+        var file = await _mareDbContext.Files.SingleOrDefaultAsync(f => f.Hash == uploadMsg.Hash && f.UploaderUID == uploadMsg.Uploader).ConfigureAwait(false);
+        if (file != null)
+        {
+            await fileWriter.WriteAsync(uploadMsg.FileData.ToArray()).ConfigureAwait(false);
+
+            while (await requestStream.MoveNext().ConfigureAwait(false))
+            {
+                await fileWriter.WriteAsync(requestStream.Current.FileData.ToArray()).ConfigureAwait(false);
+            }
+
+            await fileWriter.FlushAsync().ConfigureAwait(false);
+            fileWriter.Close();
+
+            var fileSize = new FileInfo(filePath).Length;
+            file.Uploaded = true;
+
+            _metricsClient.IncGauge(MetricsAPI.GaugeFilesTotal, 1);
+            _metricsClient.IncGauge(MetricsAPI.GaugeFilesTotalSize, fileSize);
+
+            await _mareDbContext.SaveChangesAsync().ConfigureAwait(false);
+            _logger.LogInformation("User {user} uploaded file {hash}", uploadMsg.Uploader, uploadMsg.Hash);
+        }
+
+        return new Empty();
+    }
+
+    public override async Task<Empty> DeleteFiles(DeleteFilesRequest request, ServerCallContext context)
+    {
+        foreach (var hash in request.Hash)
+        {
+            try
+            {
+                var fi = FilePathUtil.GetFileInfoForHash(_basePath, hash);
+                fi?.Delete();
+                var file = await _mareDbContext.Files.SingleOrDefaultAsync(f => f.Hash == hash).ConfigureAwait(false);
+                if (file != null)
+                {
+                    _mareDbContext.Files.Remove(file);
+
+                    _metricsClient.DecGauge(MetricsAPI.GaugeFilesTotal, fi == null ? 0 : 1);
+                    _metricsClient.DecGauge(MetricsAPI.GaugeFilesTotalSize, fi?.Length ?? 0);
+                }
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Could not delete file for hash {hash}", hash);
+            }
+        }
+
+        await _mareDbContext.SaveChangesAsync().ConfigureAwait(false);
+        return new Empty();
+    }
+
+    public override Task<FileSizeResponse> GetFileSizes(FileSizeRequest request, ServerCallContext context)
+    {
+        FileSizeResponse response = new();
+        foreach (var hash in request.Hash.Distinct(StringComparer.Ordinal))
+        {
+            FileInfo? fi = FilePathUtil.GetFileInfoForHash(_basePath, hash);
+            response.HashToFileSize.Add(hash, fi?.Length ?? 0);
+        }
+
+        return Task.FromResult(response);
+    }
+}