446 lines
18 KiB
C#
446 lines
18 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Text.RegularExpressions;
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using DataLayer;
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using Dinah.Core;
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using FileManager;
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using Lucene.Net.Analysis.Standard;
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using Lucene.Net.Documents;
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using Lucene.Net.Index;
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using Lucene.Net.Search;
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using Lucene.Net.Store;
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namespace LibationSearchEngine
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{
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public class SearchEngine
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{
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public const Lucene.Net.Util.Version Version = Lucene.Net.Util.Version.LUCENE_30;
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private LibationContext context { get; }
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// not customizable. don't move to config
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private static string SearchEngineDirectory { get; }
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= new System.IO.DirectoryInfo(Configuration.Instance.LibationFiles).CreateSubdirectory("SearchEngine").FullName;
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public const string _ID_ = "_ID_";
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public const string TAGS = "tags";
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public const string ALL = "all";
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private static ReadOnlyDictionary<string, Func<LibraryBook, string>> idIndexRules { get; }
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= new ReadOnlyDictionary<string, Func<LibraryBook, string>>(
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new Dictionary<string, Func<LibraryBook, string>>
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{
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[nameof(Book.AudibleProductId)] = lb => lb.Book.AudibleProductId,
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["ProductId"] = lb => lb.Book.AudibleProductId,
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["Id"] = lb => lb.Book.AudibleProductId,
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["ASIN"] = lb => lb.Book.AudibleProductId
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}
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);
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private static ReadOnlyDictionary<string, Func<LibraryBook, string>> stringIndexRules { get; }
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= new ReadOnlyDictionary<string, Func<LibraryBook, string>>(
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new Dictionary<string, Func<LibraryBook, string>>
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{
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[nameof(LibraryBook.DateAdded)] = lb => lb.DateAdded.ToLuceneString(),
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[nameof(Book.DatePublished)] = lb => lb.Book.DatePublished?.ToLuceneString(),
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[nameof(Book.Title)] = lb => lb.Book.Title,
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[nameof(Book.AuthorNames)] = lb => lb.Book.AuthorNames,
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["Author"] = lb => lb.Book.AuthorNames,
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["Authors"] = lb => lb.Book.AuthorNames,
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[nameof(Book.NarratorNames)] = lb => lb.Book.NarratorNames,
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["Narrator"] = lb => lb.Book.NarratorNames,
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["Narrators"] = lb => lb.Book.NarratorNames,
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[nameof(Book.Publisher)] = lb => lb.Book.Publisher,
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[nameof(Book.SeriesNames)] = lb => string.Join(
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", ",
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lb.Book.SeriesLink
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.Where(s => !string.IsNullOrWhiteSpace(s.Series.Name))
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.Select(s => s.Series.AudibleSeriesId)),
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["Series"] = lb => string.Join(
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", ",
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lb.Book.SeriesLink
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.Where(s => !string.IsNullOrWhiteSpace(s.Series.Name))
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.Select(s => s.Series.AudibleSeriesId)),
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["SeriesId"] = lb => string.Join(", ", lb.Book.SeriesLink.Select(s => s.Series.AudibleSeriesId)),
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[nameof(Book.CategoriesNames)] = lb => lb.Book.CategoriesIds == null ? null : string.Join(", ", lb.Book.CategoriesIds),
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[nameof(Book.Category)] = lb => lb.Book.CategoriesIds == null ? null : string.Join(", ", lb.Book.CategoriesIds),
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["Categories"] = lb => lb.Book.CategoriesIds == null ? null : string.Join(", ", lb.Book.CategoriesIds),
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["CategoriesId"] = lb => lb.Book.CategoriesIds == null ? null : string.Join(", ", lb.Book.CategoriesIds),
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["CategoryId"] = lb => lb.Book.CategoriesIds == null ? null : string.Join(", ", lb.Book.CategoriesIds),
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[TAGS.FirstCharToUpper()] = lb => lb.Book.UserDefinedItem.Tags
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}
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);
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private static ReadOnlyDictionary<string, Func<LibraryBook, string>> numberIndexRules { get; }
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= new ReadOnlyDictionary<string, Func<LibraryBook, string>>(
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new Dictionary<string, Func<LibraryBook, string>>
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{
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// for now, all numbers are padded to 8 char.s
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// This will allow a single method to auto-pad numbers. The method will match these as well as date: yyyymmdd
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[nameof(Book.LengthInMinutes)] = lb => lb.Book.LengthInMinutes.ToLuceneString(),
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["Length"] = lb => lb.Book.LengthInMinutes.ToLuceneString(),
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["Minutes"] = lb => lb.Book.LengthInMinutes.ToLuceneString(),
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["Hours"] = lb => (lb.Book.LengthInMinutes / 60).ToLuceneString(),
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["ProductRating"] = lb => lb.Book.Rating.OverallRating.ToLuceneString(),
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["Rating"] = lb => lb.Book.Rating.OverallRating.ToLuceneString(),
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["UserRating"] = lb => lb.Book.UserDefinedItem.Rating.OverallRating.ToLuceneString(),
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["MyRating"] = lb => lb.Book.UserDefinedItem.Rating.OverallRating.ToLuceneString()
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}
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);
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private static ReadOnlyDictionary<string, Func<LibraryBook, bool>> boolIndexRules { get; }
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= new ReadOnlyDictionary<string, Func<LibraryBook, bool>>(
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new Dictionary<string, Func<LibraryBook, bool>>
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{
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["HasDownloads"] = lb => lb.Book.Supplements.Any(),
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["HasDownload"] = lb => lb.Book.Supplements.Any(),
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["Downloads"] = lb => lb.Book.Supplements.Any(),
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["Download"] = lb => lb.Book.Supplements.Any(),
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["HasPDFs"] = lb => lb.Book.Supplements.Any(),
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["HasPDF"] = lb => lb.Book.Supplements.Any(),
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["PDFs"] = lb => lb.Book.Supplements.Any(),
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["PDF"] = lb => lb.Book.Supplements.Any(),
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["IsRated"] = lb => lb.Book.UserDefinedItem.Rating.OverallRating > 0f,
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["Rated"] = lb => lb.Book.UserDefinedItem.Rating.OverallRating > 0f,
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["IsAuthorNarrated"] = lb => isAuthorNarrated(lb),
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["AuthorNarrated"] = lb => isAuthorNarrated(lb),
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[nameof(Book.IsAbridged)] = lb => lb.Book.IsAbridged,
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["Abridged"] = lb => lb.Book.IsAbridged,
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});
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private static bool isAuthorNarrated(LibraryBook lb)
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{
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var authors = lb.Book.Authors.Select(a => a.Name).ToArray();
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var narrators = lb.Book.Narrators.Select(a => a.Name).ToArray();
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return authors.Intersect(narrators).Any();
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}
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// use these common fields in the "all" default search field
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private static IEnumerable<Func<LibraryBook, string>> allFieldIndexRules { get; }
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= new List<Func<LibraryBook, string>>
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{
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idIndexRules[nameof(Book.AudibleProductId)],
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stringIndexRules[nameof(Book.Title)],
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stringIndexRules[nameof(Book.AuthorNames)],
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stringIndexRules[nameof(Book.NarratorNames)]
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};
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public static IEnumerable<string> GetSearchIdFields()
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{
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foreach (var key in idIndexRules.Keys)
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yield return key;
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}
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public static IEnumerable<string> GetSearchStringFields()
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{
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foreach (var key in stringIndexRules.Keys)
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yield return key;
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}
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public static IEnumerable<string> GetSearchBoolFields()
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{
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foreach (var key in boolIndexRules.Keys)
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yield return key;
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}
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public static IEnumerable<string> GetSearchNumberFields()
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{
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foreach (var key in numberIndexRules.Keys)
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yield return key;
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}
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public static IEnumerable<string> GetSearchFields()
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{
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foreach (var key in idIndexRules.Keys)
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yield return key;
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foreach (var key in stringIndexRules.Keys)
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yield return key;
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foreach (var key in boolIndexRules.Keys)
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yield return key;
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foreach (var key in numberIndexRules.Keys)
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yield return key;
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}
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private Directory getIndex() => FSDirectory.Open(SearchEngineDirectory);
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public SearchEngine(LibationContext context) => this.context = context;
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public void CreateNewIndex(bool overwrite = true)
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{
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// 300 products
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// 1st run after app is started: 400ms
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// subsequent runs: 200ms
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var sw = System.Diagnostics.Stopwatch.StartNew();
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var stamps = new List<long>();
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void log() => stamps.Add(sw.ElapsedMilliseconds);
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log();
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var library = context.GetLibrary_Flat_NoTracking();
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log();
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// location of index/create the index
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using var index = getIndex();
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var exists = IndexReader.IndexExists(index);
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var createNewIndex = overwrite || !exists;
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// analyzer for tokenizing text. same analyzer should be used for indexing and searching
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using var analyzer = new StandardAnalyzer(Version);
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using var ixWriter = new IndexWriter(index, analyzer, createNewIndex, IndexWriter.MaxFieldLength.UNLIMITED);
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foreach (var libraryBook in library)
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{
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var doc = createBookIndexDocument(libraryBook);
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ixWriter.AddDocument(doc);
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}
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log();
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}
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private static Document createBookIndexDocument(LibraryBook libraryBook)
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{
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var doc = new Document();
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// refine with
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// http://codeclimber.net.nz/archive/2009/09/10/how-subtext-lucenenet-index-is-structured/
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// fields are key value pairs and MULTIPLE FIELDS CAN HAVE THE SAME KEY.
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// splitting authors and narrators and/or tags into multiple fields could be interesting research.
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// it could allow for more advanced searches, or maybe it could break broad searches.
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// all searching should be lowercase
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// external callers have the reasonable expectation that product id will be returned CASE SPECIFIC
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doc.AddRaw(_ID_, libraryBook.Book.AudibleProductId);
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// concat all common fields for the default 'all' field
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var allConcat =
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allFieldIndexRules
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.Select(rule => rule(libraryBook))
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.Aggregate((a, b) => $"{a} {b}");
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doc.AddAnalyzed(ALL, allConcat);
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foreach (var kvp in idIndexRules)
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doc.AddNotAnalyzed(kvp.Key, kvp.Value(libraryBook));
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foreach (var kvp in stringIndexRules)
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doc.AddAnalyzed(kvp.Key, kvp.Value(libraryBook));
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foreach (var kvp in boolIndexRules)
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doc.AddBool(kvp.Key, kvp.Value(libraryBook));
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foreach (var kvp in numberIndexRules)
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doc.AddNotAnalyzed(kvp.Key, kvp.Value(libraryBook));
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return doc;
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}
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/// <summary>Long running. Use await Task.Run(() => UpdateBook(productId))</summary>
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public void UpdateBook(string productId)
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{
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var libraryBook = context.GetLibraryBook_Flat_NoTracking(productId);
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var term = new Term(_ID_, productId);
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var document = createBookIndexDocument(libraryBook);
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var createNewIndex = false;
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using var index = getIndex();
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using var analyzer = new StandardAnalyzer(Version);
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using var ixWriter = new IndexWriter(index, analyzer, createNewIndex, IndexWriter.MaxFieldLength.UNLIMITED);
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ixWriter.DeleteDocuments(term);
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ixWriter.AddDocument(document);
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}
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public void UpdateTags(string productId, string tags)
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{
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var productTerm = new Term(_ID_, productId);
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using var index = getIndex();
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// get existing document
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using var searcher = new IndexSearcher(index);
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var query = new TermQuery(productTerm);
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var docs = searcher.Search(query, 1);
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var scoreDoc = docs.ScoreDocs.SingleOrDefault();
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if (scoreDoc == null)
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throw new Exception("document not found");
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var document = searcher.Doc(scoreDoc.Doc);
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// update document entry with new tags
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// fields are key value pairs and MULTIPLE FIELDS CAN HAVE THE SAME KEY. must remove old before adding new
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// REMEMBER: all fields, including 'tags' are case-specific
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document.RemoveField(TAGS);
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document.AddAnalyzed(TAGS, tags);
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// update index
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var createNewIndex = false;
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using var analyzer = new StandardAnalyzer(Version);
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using var ixWriter = new IndexWriter(index, analyzer, createNewIndex, IndexWriter.MaxFieldLength.UNLIMITED);
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ixWriter.UpdateDocument(productTerm, document, analyzer);
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}
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public SearchResultSet Search(string searchString)
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{
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if (string.IsNullOrWhiteSpace(searchString))
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searchString = "*:*";
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#region apply formatting
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searchString = parseTag(searchString);
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searchString = replaceBools(searchString);
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// in ranges " TO " must be uppercase
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searchString = searchString.Replace(" to ", " TO ");
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searchString = padNumbers(searchString);
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searchString = lowerFieldNames(searchString);
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#endregion
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var results = generalSearch(searchString);
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displayResults(results);
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return results;
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}
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private static string parseTag(string tagSearchString)
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{
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var allMatches = LuceneRegex
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.TagRegex
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.Matches(tagSearchString)
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.Cast<Match>()
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.Select(a => a.ToString())
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.ToList();
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foreach (var match in allMatches)
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tagSearchString = tagSearchString.Replace(
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match,
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TAGS + ":" + match.Trim('[', ']').Trim()
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);
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return tagSearchString;
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}
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private static string replaceBools(string searchString)
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{
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// negative look-ahead for optional spaces then colon. don't want to double-up. eg:"israted:false" => "israted:false:True"
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foreach (var boolSearch in boolIndexRules.Keys)
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searchString = Regex.Replace(searchString, $@"\b({boolSearch})\b(?!\s*:)", @"$1:True", RegexOptions.IgnoreCase);
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return searchString;
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}
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private static string padNumbers(string searchString)
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{
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var matches = LuceneRegex
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.NumbersRegex
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.Matches(searchString)
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.Cast<Match>()
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.OrderByDescending(m => m.Index);
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foreach (var m in matches)
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{
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var replaceString = double.Parse(m.ToString()).ToLuceneString();
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searchString = LuceneRegex.NumbersRegex.Replace(searchString, replaceString, 1, m.Index);
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}
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return searchString;
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}
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private static string lowerFieldNames(string searchString)
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{
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// fields are case specific
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var allMatches = LuceneRegex
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.FieldRegex
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.Matches(searchString)
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.Cast<Match>()
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.Select(a => a.ToString())
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.ToList();
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foreach (var match in allMatches)
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searchString = searchString.Replace(match, match.ToLowerInvariant());
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return searchString;
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}
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public int MaxSearchResultsToReturn { get; set; } = 999;
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private SearchResultSet generalSearch(string searchString)
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{
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Console.WriteLine($"searchString: {searchString}");
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var defaultField = ALL;
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using var index = getIndex();
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using var searcher = new IndexSearcher(index);
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using var analyzer = new StandardAnalyzer(Version);
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var query = analyzer.GetQuery(defaultField, searchString);
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// lucene doesn't allow only negations. eg this returns nothing:
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// -tags:hidden
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// work arounds: https://kb.ucla.edu/articles/pure-negation-query-in-lucene
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// HOWEVER, doing this to any other type of query can cause EVERYTHING to be a match unless "Occur" is carefully set
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// this should really check that all leaf nodes are MUST_NOT
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if (query is BooleanQuery boolQuery)
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{
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var occurs = getOccurs_recurs(boolQuery);
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if (occurs.Any() && occurs.All(o => o == Occur.MUST_NOT))
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boolQuery.Add(new MatchAllDocsQuery(), Occur.MUST);
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}
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Console.WriteLine($" query: {query}");
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var docs = searcher
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.Search(query, MaxSearchResultsToReturn)
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.ScoreDocs
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.Select(ds => new ScoreDocExplicit(searcher.Doc(ds.Doc), ds.Score))
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.ToList();
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return new SearchResultSet(query.ToString(), docs);
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}
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private IEnumerable<Occur> getOccurs_recurs(BooleanQuery query)
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{
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var returnList = new List<Occur>();
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foreach (var clause in query)
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{
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returnList.Add(clause.Occur);
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if (clause.Query is BooleanQuery boolQuery)
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returnList.AddRange(getOccurs_recurs(boolQuery));
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}
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return returnList;
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}
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private void displayResults(SearchResultSet docs)
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{
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Console.WriteLine($"Hit(s): {docs.Docs.Count()}");
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//for (int i = 0; i < docs.Docs.Count(); i++)
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//{
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// var sde = docs.Docs.First();
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// Document doc = sde.Doc;
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// float score = sde.Score;
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// Console.WriteLine($"{(i + 1)}) score={score}. Fields:");
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// var allFields = doc.GetFields();
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// foreach (var f in allFields)
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// Console.WriteLine($" [{f.Name}]={f.StringValue}");
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//}
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//Console.WriteLine();
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}
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}
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}
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