Module: Wp2txt::IndexCommands

Defined in:
lib/wp2txt/index_commands.rb

Overview

CLI command handlers for --build-index and --find-articles. Mixed into WpApp (bin/wp2txt); relies on CliUI helpers for output.

Instance Method Summary collapse

Instance Method Details

#build_fulltext_index(opts, multistream_path, stream_offsets, meta_db_path, num_processes) ⇒ Object

Build the FTS5 full-text index (Tier 2) after the metadata index



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# File 'lib/wp2txt/index_commands.rb', line 130

def build_fulltext_index(opts, multistream_path, stream_offsets, meta_db_path, num_processes)
  fts_db_path = FtsIndex.path_for(multistream_path, cache_dir: opts[:cache_dir])
  tokenizer = opts[:fts_tokenizer] || FtsIndex.default_tokenizer(multistream_path)

  fts = FtsIndex.new(fts_db_path, meta_db_path)
  if fts.valid_for?(multistream_path) && !opts[:update_cache]
    print_success("Full-text index is up to date: #{fts_db_path}")
    fts.close
    return CliUI::EXIT_SUCCESS
  end
  fts.close

  puts pastel.cyan("Building full-text index (tokenizer: #{tokenizer})...") unless quiet?
  time_start = Time.now
  ok = run_phase_isolated do
    builder = FtsIndexBuilder.new(
      multistream_path, stream_offsets,
      db_path: fts_db_path, meta_db_path: meta_db_path,
      tokenizer: tokenizer, num_processes: num_processes,
      optimize: !opts[:skip_fts_optimize]
    )

    last_report = Time.now
    built = builder.build do |done, total|
      now = Time.now
      if !quiet? && (now - last_report >= DEFAULT_PROGRESS_INTERVAL || done == total)
        last_report = now
        percent = (done.to_f / total * 100).round(1)
        elapsed = now - time_start
        eta = done.positive? ? (total - done) * (elapsed / done) : 0
        puts pastel.dim(format("  [%d/%d] %.1f%% | ETA: %s", done, total, percent, format_duration(eta)))
      end
    end

    puts unless quiet?
    print_success("Full-text index built in #{format_duration(Time.now - time_start)}")
    stats = built.stats
    print_info("Tokenizer", stats[:tokenizer].to_s)
    print_info("Sections", stats[:section_count].to_s)
    print_info("Size", format_size(stats[:db_size]))
    unless stats[:optimized]
      print_info_message("Index is unoptimized (built with --skip-fts-optimize). Run 'wp2txt --fts-optimize' later for best query speed.")
    end
    built.close
    true
  end
  ok ? CliUI::EXIT_SUCCESS : CliUI::EXIT_ERROR
end

#load_stream_offsets(index_path, opts) ⇒ Array(Array<Integer>, Integer)

Load stream offsets without holding the full title index in memory. The builders fork worker processes; a parent heap holding millions of index entries (~14GB for enwiki) gets duplicated through copy-on-write breakage in every child and OOMs the machine. Offsets are a small integer array, so prefer reading just them from the SQLite cache.

Returns:

  • (Array(Array<Integer>, Integer)) —

    [stream_offsets, entry_count]



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# File 'lib/wp2txt/index_commands.rb', line 112

def load_stream_offsets(index_path, opts)
  cache = IndexCache.new(index_path, cache_dir: opts[:cache_dir])
  if cache.valid?
    [cache.stream_offsets, cache.stats[:entry_count]]
  else
    # First run: parse the index (this also writes the SQLite cache),
    # then discard the entry hashes before any fork
    ms_index = MultistreamIndex.new(index_path, cache_dir: opts[:cache_dir], show_progress: !quiet?)
    offsets = ms_index.stream_offsets
    count = ms_index.size
    ms_index = nil
    GC.start
    GC.compact if GC.respond_to?(:compact)
    [offsets, count]
  end
end

#run_build_index(opts) ⇒ Object

Build (or refresh) the local metadata index for a dump



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# File 'lib/wp2txt/index_commands.rb', line 15

def run_build_index(opts)
  multistream_path, index_path = resolve_dump_paths(opts, download: true)
  return CliUI::EXIT_ERROR unless multistream_path

  db_path = MetadataIndex.path_for(multistream_path, cache_dir: opts[:cache_dir])
  meta = MetadataIndex.new(db_path)

  if meta.valid_for?(multistream_path) && !opts[:update_cache]
    print_success("Metadata index is up to date: #{db_path}")
    print_index_stats(meta.stats)
    meta.close
    return CliUI::EXIT_SUCCESS unless opts[:fulltext]

    stream_offsets, = load_stream_offsets(index_path, opts)
    num_processes = opts[:num_procs] || MemoryMonitor.optimal_processes
    return build_fulltext_index(opts, multistream_path, stream_offsets, db_path, num_processes)
  end
  meta.close

  print_mode_banner("Build Metadata Index", {
    "Dump" => File.basename(multistream_path),
    "Output" => db_path
  })

  time_start = Time.now
  puts pastel.cyan("Loading multistream index...") unless quiet?
  stream_offsets, entry_count = load_stream_offsets(index_path, opts)
  if stream_offsets.empty?
    print_error("Multistream index is empty or unreadable: #{index_path}")
    return CliUI::EXIT_ERROR
  end

  num_processes = opts[:num_procs] || MemoryMonitor.optimal_processes
  puts pastel.cyan("Scanning #{entry_count} pages in #{stream_offsets.size} streams (#{num_processes} processes)...") unless quiet?

  ok = run_phase_isolated do
    builder = MetadataIndexBuilder.new(
      multistream_path, stream_offsets,
      db_path: db_path, num_processes: num_processes
    )

    last_report = Time.now
    built = builder.build do |done, total|
      now = Time.now
      if !quiet? && (now - last_report >= DEFAULT_PROGRESS_INTERVAL || done == total)
        last_report = now
        percent = (done.to_f / total * 100).round(1)
        elapsed = now - time_start
        eta = done.positive? ? (total - done) * (elapsed / done) : 0
        puts pastel.dim(format("  [%d/%d] %.1f%% | ETA: %s", done, total, percent, format_duration(eta)))
      end
    end

    puts unless quiet?
    print_success("Metadata index built in #{format_duration(Time.now - time_start)}")
    print_index_stats(built.stats)
    built.close
    true
  end
  return CliUI::EXIT_ERROR unless ok

  return build_fulltext_index(opts, multistream_path, stream_offsets, db_path, num_processes) if opts[:fulltext]

  CliUI::EXIT_SUCCESS
end

#run_find_articles(opts) ⇒ Object

Query the metadata index and print matching article titles



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# File 'lib/wp2txt/index_commands.rb', line 248

def run_find_articles(opts)
  multistream_path, = resolve_dump_paths(opts, download: false)
  return CliUI::EXIT_ERROR unless multistream_path

  db_path = MetadataIndex.path_for(multistream_path, cache_dir: opts[:cache_dir])
  meta = MetadataIndex.new(db_path)

  unless meta.built?
    print_error("Metadata index not found for this dump.")
    print_info_message("Build it first with: wp2txt --build-index #{opts[:lang] ? "-L #{opts[:lang]}" : "-i #{opts[:input]}"}")
    return CliUI::EXIT_ERROR
  end

  unless meta.valid_for?(multistream_path)
    print_warning("Metadata index was built from a different version of this dump. Consider re-running --build-index.")
  end

  filters = {
    category: opts[:in_category],
    depth: opts[:in_category] ? opts[:depth] : 0,
    has_section: opts[:has_section],
    use_aliases: !opts[:no_section_aliases],
    alias_file: opts[:alias_file],
    title_match: opts[:title_match]
  }

  total = meta.count_articles(**filters)
  titles = meta.find_articles(**filters, limit: opts[:limit])
  dump_name = meta.stats[:dump_name]
  meta.close

  if opts[:format].to_s.downcase == "json"
    puts JSON.generate({ dump: dump_name, total: total, returned: titles.size, titles: titles })
  else
    titles.each { |t| puts t }
    $stderr.puts pastel.dim("# #{titles.size} of #{total} matching articles (dump: #{dump_name})")
  end
  CliUI::EXIT_SUCCESS
end

#run_fts_optimize(opts) ⇒ Object

Standalone optimize of an existing full-text index (--fts-optimize)



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# File 'lib/wp2txt/index_commands.rb', line 180

def run_fts_optimize(opts)
  multistream_path, = resolve_dump_paths(opts, download: false)
  return CliUI::EXIT_ERROR unless multistream_path

  fts = FtsIndex.new(
    FtsIndex.path_for(multistream_path, cache_dir: opts[:cache_dir]),
    MetadataIndex.path_for(multistream_path, cache_dir: opts[:cache_dir])
  )
  unless fts.built?
    print_error("Full-text index not found for this dump.")
    print_info_message("Build it first with: wp2txt --build-index --fulltext #{opts[:lang] ? "-L #{opts[:lang]}" : "-i #{opts[:input]}"}")
    return CliUI::EXIT_ERROR
  end

  if fts.optimized?
    print_success("Full-text index is already optimized.")
    fts.close
    return CliUI::EXIT_SUCCESS
  end

  print_info_message("Optimizing full-text index (single-threaded; can take 30-60+ minutes on large indexes)...")
  time_start = Time.now
  fts.optimize!
  print_success("Optimize complete in #{format_duration(Time.now - time_start)}")
  print_info("Size", format_size(File.size(fts.db_path)))
  fts.close
  CliUI::EXIT_SUCCESS
end

#run_phase_isolated(&block) ⇒ Boolean

Run a build phase in a forked child process. Each phase pumps its whole dataset through the parent's heap (Marshal.load of every worker batch), leaving a multi-GB high-water mark; a later phase forking workers from that bloated parent duplicates it per worker via copy-on-write breakage and OOMs the machine (observed on enwiki: 18GB per FTS worker). A child process confines each phase's high-water mark to that phase.

Returns:

  • (Boolean) —

    whether the phase succeeded



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# File 'lib/wp2txt/index_commands.rb', line 88

def run_phase_isolated(&block)
  return block.call unless Process.respond_to?(:fork)

  pid = Process.fork do
    status = 1
    begin
      status = block.call ? 0 : 1
    rescue StandardError => e
      warn "#{e.class}: #{e.message}"
    end
    $stdout.flush
    $stderr.flush
    exit!(status) # skip at_exit handlers; they belong to the parent
  end
  _, status = Process.waitpid2(pid)
  status.success?
end

#run_search(opts) ⇒ Object

Full-text search from the CLI (--search)



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# File 'lib/wp2txt/index_commands.rb', line 210

def run_search(opts)
  multistream_path, = resolve_dump_paths(opts, download: false)
  return CliUI::EXIT_ERROR unless multistream_path

  corpus = Corpus.new(
    multistream_path: multistream_path,
    index_path: resolve_dump_paths(opts, download: false)[1],
    cache_dir: opts[:cache_dir]
  )

  unless corpus.fts.built?
    print_error("Full-text index not found for this dump.")
    print_info_message("Build it first with: wp2txt --build-index --fulltext #{opts[:lang] ? "-L #{opts[:lang]}" : "-i #{opts[:input]}"}")
    return CliUI::EXIT_ERROR
  end

  result = corpus.search_text(
    opts[:search],
    sections: opts[:has_section] ? [opts[:has_section]] : nil,
    category: opts[:in_category],
    depth: opts[:in_category] ? opts[:depth] : 0,
    limit: opts[:limit].positive? ? opts[:limit] : 20,
    count: "exact"
  )

  if opts[:format].to_s.downcase == "json"
    puts JSON.generate(result)
  else
    result[:hits].each do |hit|
      puts "#{hit[:section_path]}: #{hit[:snippet]}"
    end
    $stderr.puts pastel.dim("# #{result[:returned]} of #{result[:total]} matches (dump: #{result[:dump]})")
  end
  corpus.close
  CliUI::EXIT_SUCCESS
end