new framework

lib/repository/board_repository.rb

@@ -0,0 +1,83 @@
+# frozen_string_literal: true
+
+require 'csv'
+require 'time'
+require 'fileutils'
+require_relative '../model/message_model'
+
+# Multi-board store. Each board ("general", "tech", "offtopic"…) maps to one
+# CSV file inside +base_dir+. Lazy-loaded the first time a board is touched.
+class BoardRepository
+  BoardMeta = Struct.new(:id, :title, :description)
+
+  DEFAULT_BOARDS = [
+    BoardMeta.new('general',  'General',  'Open chat, anything goes'),
+    BoardMeta.new('tech',     'Tech',     'Hardware, software, code'),
+    BoardMeta.new('offtopic', 'Off-Topic','Random topics, jokes'),
+    BoardMeta.new('sysop',    'Sysop',    'Notes from the operator'),
+  ].freeze
+
+  attr_reader :boards
+
+  def initialize(base_dir, boards: DEFAULT_BOARDS, legacy_path: nil)
+    @base_dir = base_dir
+    @boards   = boards
+    @cache    = {}
+    @mu       = Mutex.new
+    FileUtils.mkdir_p(@base_dir)
+    migrate_legacy!(legacy_path) if legacy_path
+  end
+
+  def append(board_id, username, text)
+    msg = MessageModel.new(Time.now.strftime('%m-%d %H:%M'), username, text)
+    @mu.synchronize do
+      load_board(board_id) << msg
+      CSV.open(path_for(board_id), 'a') { |csv| csv << [msg.timestamp, msg.username, msg.text] }
+    end
+    msg
+  end
+
+  def last(board_id, n = 30)
+    @mu.synchronize { load_board(board_id).last(n) }
+  end
+
+  def count(board_id)
+    @mu.synchronize { load_board(board_id).size }
+  end
+
+  def total_count
+    @mu.synchronize { @boards.sum { |b| load_board(b.id).size } }
+  end
+
+  private
+
+  def migrate_legacy!(legacy_path)
+    return unless File.exist?(legacy_path)
+    target = path_for('general')
+    return if File.exist?(target) # already migrated or general has its own data
+    rows = []
+    CSV.foreach(legacy_path) { |row| rows << row }
+    return if rows.empty?
+    CSV.open(target, 'w') { |csv| rows.each { |r| csv << r } }
+    warn "BoardRepository: migrated #{rows.size} legacy messages " \
+         "from #{legacy_path} to #{target}"
+  rescue StandardError => e
+    warn "BoardRepository: legacy migration failed: #{e}"
+  end
+
+  def path_for(id)
+    File.join(@base_dir, "#{id}.csv")
+  end
+
+  def load_board(id)
+    return @cache[id] if @cache.key?(id)
+    list = []
+    if File.exist?(path_for(id))
+      CSV.foreach(path_for(id)) { |row| list << MessageModel.new(*row) }
+    end
+    @cache[id] = list
+  rescue StandardError => e
+    warn "BoardRepository load error (#{id}): #{e}"
+    @cache[id] = []
+  end
+end