private async static Task FetchShardCountAsync()

in code/KustoCopyConsole/Storage/LogStorage.cs [94:136]
40 lines of code
6 McCabe index (conditional complexity)

        private async static Task<long> FetchShardCountAsync(
            IFileSystem fileSystem,
            CancellationToken ct)
        {
            using (var stream = await fileSystem.OpenReadAsync(INDEX_PATH, ct))
            {
                if (stream == null)
                {
                    return 0;
                }
                else
                {
                    using (var reader = new StreamReader(stream))
                    {
                        var headerText = await reader.ReadLineAsync();
                        var indexText = await reader.ReadLineAsync();

                        var header = headerText != null
                            ? JsonSerializer.Deserialize<VersionHeader>(
                                headerText,
                                HeaderJsonContext.Default.VersionHeader)
                            : null;
                        var indexInfo = indexText != null
                            ? JsonSerializer.Deserialize<IndexInfo>(
                                indexText,
                                HeaderJsonContext.Default.IndexInfo)
                            : null;

                        if (header == null)
                        {
                            throw new InvalidDataException("Index blob doesn't contain header");
                        }
                        if (indexInfo == null)
                        {
                            throw new InvalidDataException(
                                "Index blob doesn't contain index information");
                        }

                        return indexInfo.ShardCount;
                    }
                }
            }
        }