LoadPackageReadmeDriver.cs

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

namespace NuGet.Insights.Worker.LoadPackageReadme
{
    public class LoadPackageReadmeDriver : ICatalogLeafScanBatchDriver
    {
        private readonly PackageReadmeService _packageReadmeService;
        private readonly ILogger<LoadPackageReadmeDriver> _logger;

        public LoadPackageReadmeDriver(PackageReadmeService packageReadmeService, ILogger<LoadPackageReadmeDriver> logger)
        {
            _packageReadmeService = packageReadmeService;
            _logger = logger;
        }

        public async Task InitializeAsync()
        {
            await _packageReadmeService.InitializeAsync();
        }

        public Task InitializeAsync(CatalogIndexScan indexScan)
        {
            return Task.CompletedTask;
        }

        public Task<CatalogIndexScanResult> ProcessIndexAsync(CatalogIndexScan indexScan)
        {
            return Task.FromResult(indexScan.OnlyLatestLeaves ? CatalogIndexScanResult.ExpandLatestLeaves : CatalogIndexScanResult.ExpandAllLeaves);
        }

        public Task<CatalogPageScanResult> ProcessPageAsync(CatalogPageScan pageScan)
        {
            return Task.FromResult(CatalogPageScanResult.ExpandRemoveDuplicates);
        }

        public async Task<BatchMessageProcessorResult<CatalogLeafScan>> ProcessLeavesAsync(IReadOnlyList<CatalogLeafScan> leafScans)
        {
            var failed = new List<CatalogLeafScan>();

            foreach (var group in leafScans.GroupBy(x => x.PackageId, StringComparer.OrdinalIgnoreCase))
            {
                var leafItems = group.Select(x => x.ToPackageIdentityCommit()).ToList();
                try
                {
                    await _packageReadmeService.UpdateBatchFromLeafItemsAsync(group.Key, leafItems);
                }
                catch (Exception ex) when (leafScans.Count != 1)
                {
                    _logger.LogError(ex, "Updating package readme info failed for {Id} with {Count} versions.", group.Key, leafItems.Count);
                    failed.AddRange(group);
                }
            }

            return new BatchMessageProcessorResult<CatalogLeafScan>(failed);
        }

        public Task StartAggregateAsync(CatalogIndexScan indexScan)
        {
            return Task.CompletedTask;
        }

        public Task<bool> IsAggregateCompleteAsync(CatalogIndexScan indexScan)
        {
            return Task.FromResult(true);
        }

        public Task FinalizeAsync(CatalogIndexScan indexScan)
        {
            return Task.CompletedTask;
        }

        public async Task DestroyOutputAsync()
        {
            await _packageReadmeService.DestroyAsync();
        }
    }
}