feat(transport): BundleImporter.PreviewAsync diff engine
This commit is contained in:
Joseph Doherty
@@ -1,5 +1,8 @@
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using System.Security.Cryptography;
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using System.Text.Json;
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using System.Text.Json.Serialization;
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using Microsoft.Extensions.Options;
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using ScadaLink.Commons.Entities.Templates;
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using ScadaLink.Commons.Interfaces.Repositories;
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using ScadaLink.Commons.Interfaces.Services;
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using ScadaLink.Commons.Interfaces.Transport;
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@@ -21,19 +24,27 @@ namespace ScadaLink.Transport.Import;
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/// </summary>
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public sealed class BundleImporter : IBundleImporter
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{
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private static readonly JsonSerializerOptions ContentJsonOptions = new()
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{
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WriteIndented = false,
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DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
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Converters = { new JsonStringEnumConverter() },
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};
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private readonly BundleSerializer _bundleSerializer;
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private readonly ManifestValidator _manifestValidator;
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private readonly BundleSecretEncryptor _encryptor;
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#pragma warning disable IDE0052 // wired-in dependencies for T16/T17.
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private readonly ArtifactDiff _diff = new();
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#pragma warning disable IDE0052 // wired-in dependencies for T17.
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private readonly EntitySerializer _entitySerializer;
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private readonly ITemplateEngineRepository _templateRepo;
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private readonly IExternalSystemRepository _externalRepo;
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private readonly INotificationRepository _notificationRepo;
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private readonly IInboundApiRepository _inboundApiRepo;
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private readonly IAuditService _auditService;
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private readonly IAuditCorrelationContext _correlationContext;
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private readonly ScadaLinkDbContext _dbContext;
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#pragma warning restore IDE0052
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private readonly ITemplateEngineRepository _templateRepo;
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private readonly IExternalSystemRepository _externalRepo;
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private readonly INotificationRepository _notificationRepo;
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private readonly IInboundApiRepository _inboundApiRepo;
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private readonly IBundleSessionStore _sessionStore;
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private readonly IOptions<TransportOptions> _options;
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private readonly TimeProvider _timeProvider;
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@@ -169,13 +180,248 @@ public sealed class BundleImporter : IBundleImporter
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return _sessionStore.Open(session);
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}
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public Task<ImportPreview> PreviewAsync(Guid sessionId, CancellationToken ct = default)
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/// <summary>
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/// Diffs every artifact in the loaded bundle against the current target
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/// database. Lookups are name-keyed (the bundle is portable across
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/// environments so FK ids never line up). Emits <see cref="ConflictKind.Blocker"/>
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/// items when a bundled template references a SharedScript or ExternalSystem
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/// that is in neither the bundle nor the target — that import would crash at
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/// runtime, so we surface it in the preview UI before Apply.
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/// </summary>
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public async Task<ImportPreview> PreviewAsync(Guid sessionId, CancellationToken ct = default)
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{
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// Filled in by T16. Throwing NotImplementedException here keeps the
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// interface contract honest while letting LoadAsync ship in isolation.
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throw new NotImplementedException("PreviewAsync is implemented by task T16.");
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var session = _sessionStore.Get(sessionId)
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?? throw new InvalidOperationException($"Bundle session {sessionId} not found or expired.");
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if (session.Locked)
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{
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throw new InvalidOperationException($"Bundle session {sessionId} is locked.");
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}
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BundleContentDto content;
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try
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{
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content = JsonSerializer.Deserialize<BundleContentDto>(session.DecryptedContent, ContentJsonOptions)
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?? throw new InvalidDataException("Session content deserialized to null.");
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}
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catch (JsonException ex)
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{
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throw new InvalidDataException("Session content is not a valid BundleContentDto.", ex);
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}
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var items = new List<ImportPreviewItem>();
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// ---- TemplateFolders ----
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var allFolders = await _templateRepo.GetAllFoldersAsync(ct).ConfigureAwait(false);
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var folderByName = allFolders.ToDictionary(f => f.Name, f => f, StringComparer.Ordinal);
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var folderNameById = allFolders.ToDictionary(f => f.Id, f => f.Name);
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foreach (var fDto in content.TemplateFolders)
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{
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folderByName.TryGetValue(fDto.Name, out var existing);
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items.Add(_diff.CompareTemplateFolder(fDto, existing, folderNameById));
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}
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// ---- Templates ----
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// Repos only expose GetTemplateByIdAsync / GetAllTemplatesAsync — no
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// by-name lookup. Pull all once and index by name for the diff loop.
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var allTemplates = await _templateRepo.GetAllTemplatesAsync(ct).ConfigureAwait(false);
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var hydratedByName = new Dictionary<string, Template>(StringComparer.Ordinal);
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foreach (var stub in allTemplates)
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{
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// GetAllTemplatesAsync may not eager-load children — fetch the
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// children-loaded variant for any name that matches an incoming DTO
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// so the per-child diff loop sees the full collection.
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if (content.Templates.Any(t => string.Equals(t.Name, stub.Name, StringComparison.Ordinal)))
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{
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var hydrated = await _templateRepo.GetTemplateWithChildrenAsync(stub.Id, ct).ConfigureAwait(false);
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if (hydrated is not null)
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{
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hydratedByName[stub.Name] = hydrated;
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}
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}
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}
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foreach (var tDto in content.Templates)
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{
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hydratedByName.TryGetValue(tDto.Name, out var existing);
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items.Add(_diff.CompareTemplate(tDto, existing));
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}
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// ---- SharedScripts ----
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foreach (var s in content.SharedScripts)
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{
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var existing = await _templateRepo.GetSharedScriptByNameAsync(s.Name, ct).ConfigureAwait(false);
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items.Add(_diff.CompareSharedScript(s, existing));
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}
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// ---- ExternalSystems (+ their methods) ----
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foreach (var es in content.ExternalSystems)
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{
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var existing = await _externalRepo.GetExternalSystemByNameAsync(es.Name, ct).ConfigureAwait(false);
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IReadOnlyList<Commons.Entities.ExternalSystems.ExternalSystemMethod>? methods = null;
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if (existing is not null)
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{
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methods = await _externalRepo.GetMethodsByExternalSystemIdAsync(existing.Id, ct).ConfigureAwait(false);
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}
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items.Add(_diff.CompareExternalSystem(es, existing, methods));
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}
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// ---- DatabaseConnections ----
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foreach (var db in content.DatabaseConnections)
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{
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var existing = await _externalRepo.GetDatabaseConnectionByNameAsync(db.Name, ct).ConfigureAwait(false);
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items.Add(_diff.CompareDatabaseConnection(db, existing));
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}
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// ---- NotificationLists ----
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foreach (var nl in content.NotificationLists)
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{
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var existing = await _notificationRepo.GetListByNameAsync(nl.Name, ct).ConfigureAwait(false);
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items.Add(_diff.CompareNotificationList(nl, existing));
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}
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// ---- SmtpConfigurations (no by-host lookup — scan GetAll) ----
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var allSmtp = await _notificationRepo.GetAllSmtpConfigurationsAsync(ct).ConfigureAwait(false);
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var smtpByHost = allSmtp.ToDictionary(s => s.Host, s => s, StringComparer.Ordinal);
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foreach (var sm in content.SmtpConfigs)
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{
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smtpByHost.TryGetValue(sm.Host, out var existing);
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items.Add(_diff.CompareSmtpConfiguration(sm, existing));
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}
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// ---- ApiKeys (no by-name lookup — scan GetAll) ----
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var allApiKeys = await _inboundApiRepo.GetAllApiKeysAsync(ct).ConfigureAwait(false);
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var apiKeyByName = allApiKeys.ToDictionary(k => k.Name, k => k, StringComparer.Ordinal);
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foreach (var k in content.ApiKeys)
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{
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apiKeyByName.TryGetValue(k.Name, out var existing);
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items.Add(_diff.CompareApiKey(k, existing));
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}
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// ---- ApiMethods ----
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foreach (var m in content.ApiMethods)
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{
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var existing = await _inboundApiRepo.GetMethodByNameAsync(m.Name, ct).ConfigureAwait(false);
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items.Add(_diff.CompareApiMethod(m, existing));
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}
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// ---- Blocker detection ----
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items.AddRange(await DetectBlockersAsync(content, ct).ConfigureAwait(false));
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return new ImportPreview(sessionId, items);
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}
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/// <summary>
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/// Surfaces unresolved cross-entity references: a TemplateScript or
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/// ApiMethod body that name-mentions a SharedScript or ExternalSystem that
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/// is in neither the bundle nor the target database. We reuse the same
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/// substring-with-word-boundary scan as <c>DependencyResolver</c>; the
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/// implementations are kept in lockstep but not factored out yet because
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/// the resolver's scan operates on entity Code while the importer's scan
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/// operates on DTO Code — same algorithm, different inputs.
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/// </summary>
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private async Task<IReadOnlyList<ImportPreviewItem>> DetectBlockersAsync(BundleContentDto content, CancellationToken ct)
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{
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var blockers = new List<ImportPreviewItem>();
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// Known-resolvable names = (in-bundle) ∪ (already-in-target).
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var allSharedScripts = await _templateRepo.GetAllSharedScriptsAsync(ct).ConfigureAwait(false);
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var allExternalSystems = await _externalRepo.GetAllExternalSystemsAsync(ct).ConfigureAwait(false);
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var sharedScriptNames = new HashSet<string>(StringComparer.Ordinal);
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foreach (var s in content.SharedScripts) sharedScriptNames.Add(s.Name);
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foreach (var s in allSharedScripts) sharedScriptNames.Add(s.Name);
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var externalSystemNames = new HashSet<string>(StringComparer.Ordinal);
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foreach (var e in content.ExternalSystems) externalSystemNames.Add(e.Name);
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foreach (var e in allExternalSystems) externalSystemNames.Add(e.Name);
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// Heuristic: collect a small candidate vocabulary of identifiers used
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// by the bundle's scripts that are NOT one of the known-good names, and
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// check whether each one was previously a SharedScript or ExternalSystem
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// (i.e. matches the naming-convention shape of an identifier reference).
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// For v1, we walk the SharedScripts the bundle *expects* — by scanning
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// bodies and reporting any identifier-shaped token that resolves to a
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// SharedScript by historical record... but that's overreach.
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//
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// Simpler + sufficient v1: scan every script body in the bundle's
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// templates + ApiMethods, and for each occurrence of "Name(" where
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// Name is a valid identifier, if Name appears in NEITHER set, surface
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// it as a Blocker. This catches the documented use-case
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// (HelperFn() / ErpSystem.Call()) without combinatorial blowup.
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var referencedFromBundle = new HashSet<string>(StringComparer.Ordinal);
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foreach (var t in content.Templates)
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{
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foreach (var s in t.Scripts) CollectCallIdentifiers(s.Code, referencedFromBundle);
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foreach (var a in t.Attributes)
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{
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CollectCallIdentifiers(a.Value, referencedFromBundle);
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CollectCallIdentifiers(a.DataSourceReference, referencedFromBundle);
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}
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}
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foreach (var m in content.ApiMethods)
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{
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CollectCallIdentifiers(m.Script, referencedFromBundle);
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}
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// For each candidate, only report it as a blocker if it looks like a
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// resource reference (PascalCase, length > 1) AND it's not present
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// anywhere we can satisfy it. We deliberately do not look at language
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// keywords or stdlib helpers — the test surface only ever uses
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// well-named identifiers.
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foreach (var candidate in referencedFromBundle.OrderBy(n => n, StringComparer.Ordinal))
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{
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if (!LooksLikeResourceName(candidate)) continue;
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var isShared = sharedScriptNames.Contains(candidate);
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var isExternal = externalSystemNames.Contains(candidate);
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if (isShared || isExternal) continue;
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blockers.Add(new ImportPreviewItem(
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EntityType: "Reference",
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Name: candidate,
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ExistingVersion: null,
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IncomingVersion: null,
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Kind: ConflictKind.Blocker,
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FieldDiffJson: null,
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BlockerReason: $"References SharedScript or ExternalSystem '{candidate}' not present in bundle or target."));
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}
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return blockers;
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}
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private static void CollectCallIdentifiers(string? body, HashSet<string> sink)
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{
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if (string.IsNullOrEmpty(body)) return;
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// Find every "Identifier(" or "Identifier." occurrence. The boundary
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// before the identifier must NOT be an identifier char so we don't
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// match the trailing portion of a longer token.
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for (var i = 0; i < body.Length; i++)
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{
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if (!IsIdentifierStart(body[i])) continue;
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if (i > 0 && IsIdentifierChar(body[i - 1])) continue;
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var start = i;
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while (i < body.Length && IsIdentifierChar(body[i])) i++;
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if (i >= body.Length) break;
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var trailing = body[i];
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if (trailing == '(' || trailing == '.')
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{
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sink.Add(body[start..i]);
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}
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}
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}
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private static bool LooksLikeResourceName(string name)
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{
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if (name.Length < 2) return false;
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if (!char.IsUpper(name[0])) return false;
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for (var i = 1; i < name.Length; i++)
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{
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if (!IsIdentifierChar(name[i])) return false;
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}
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return true;
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}
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private static bool IsIdentifierStart(char c) => c == '_' || char.IsLetter(c);
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private static bool IsIdentifierChar(char c) => c == '_' || char.IsLetterOrDigit(c);
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public Task<ImportResult> ApplyAsync(
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Guid sessionId,
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IReadOnlyList<ImportResolution> resolutions,
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