Class: Ytterb::StockSymbolCacheBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/ytterb/stock_symbol_cache_builder.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StockSymbolCacheBuilder 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 21

def initialize
  @yql = YQLClient.new
  @sml = StockMarketLoader.new
  @local_path = File.expand_path(File.dirname(__FILE__))
  build_local_symbol_files
  load_build_local_settings_file
  @local_settings ||= {}
  
  # defaults to be used if not defined
  @local_settings[:sync_from] ||= (Date.today-365).to_s
  @local_settings[:sync_increment] ||= 120
  @local_settings[:api_calls_per_hour] ||= 1900
  
  # build the queue used when syncing
  build_stock_sync_queue
  
  # run the processor that fetches and persists stock info
  stock_processor_run
  
  save_local_settings_file
end

Instance Method Details

#build_local_symbol_files ⇒ Object 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 43

def build_local_symbol_files
  @symbol_mappings = {}
  cache_path = File.join(@local_path, "cached_symbol_data")
  @sml.stock_symbols.each do |stock|
    current_symbol = stock.symbol
    split_for_storage = current_symbol.split('')
    split_for_storage[-1]+='.yaml'
    destination_storage_file = File.join(cache_path,split_for_storage)
    FileUtils.mkdir_p(File.dirname(destination_storage_file))
    unless File.file?(destination_storage_file)
      FileUtils.touch(destination_storage_file)
      puts "touching #{current_symbol} => #{destination_storage_file}"
    end
    @symbol_mappings[current_symbol] = destination_storage_file
  end
end

#build_stock_sync_queue ⇒ Object 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 60

def build_stock_sync_queue
  @stock_sync_queue = Queue.new
  @sml.stock_symbols.shuffle.each do |stock|
    @stock_sync_queue << stock.symbol
  end
end

#load_build_local_settings_file ⇒ Object 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 103

def load_build_local_settings_file
  local_settings_file = File.join(@local_path, "local_settings", "settings.yaml")
  @local_settings = DataPersistHelper.load(local_settings_file)
rescue StandardError => e
  puts "failed to load local settings file: #{e.message}"
end

#save_local_settings_file ⇒ Object 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 110

def save_local_settings_file
  local_settings_file = File.join(@local_path, "local_settings", "settings.yaml")
  DataPersistHelper.save(local_settings_file, @local_settings)
end

#stock_processor_run ⇒ Object 



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# File 'lib/ytterb/stock_symbol_cache_builder.rb', line 67

def stock_processor_run
  while true
    begin
      curr = @stock_sync_queue.pop(true) rescue nil
      break unless curr # queue is empty
      sleep(3600.0/@local_settings[:api_calls_per_hour])
      puts "#{@stock_sync_queue.length} symbols in the queue"
      puts "Processing Symbol: #{curr}"
      curr_file = @symbol_mappings[curr]
      curr_stock_info = DataPersistHelper.load(curr_file) rescue nil
      curr_stock_info ||= {}
      curr_stock_info[:sync_to] ||= @local_settings[:sync_from]
      date_start = Date.parse(curr_stock_info[:sync_to])
      if (date_start < Date.today)
        date_end = date_start + @local_settings[:sync_increment]
        date_end = Date.today if date_end > Date.today
        result = @yql.get_symbol_historical(curr,date_start.to_s, date_end.to_s)
        curr_stock_info[:sync_to] = date_end.to_s
        if result and result.has_key?("quote")
          result["quote"].each do |item|
            curr_stock_info[:data]||={}
            curr_stock_info[:data][item["Date"]] = item
          end
          @stock_sync_queue << curr
          puts curr_stock_info[:sync_to]
          DataPersistHelper.save(curr_file,curr_stock_info)
        else
          puts "Debug result: #{result}"
        end
      end
    rescue StandardError => e
      puts "error in stock processor run: #{e.message} : #{e.backtrace.join(" | ")}"
    end
  end
end