Class: Cornucopia::Util::LogCapture

Inherits:
Object
  • Object
show all
Defined in:
lib/cornucopia/util/log_capture.rb

Constant Summary collapse

TAIL_BUF_LENGTH = 
1 << 16

Class Method Summary collapse

Class Method Details

.backup_log_files(backup_folder) ⇒ Object 



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# File 'lib/cornucopia/util/log_capture.rb', line 10

def backup_log_files(backup_folder)
  if Object.const_defined?("Rails")
    log_folder = Rails.root.to_s
    if (log_folder =~ /\/features\/?$/ || log_folder =~ /\/spec\/?$/)
      log_folder = File.join(log_folder, "../")
    end

    default_log_file = "log/#{Rails.env.to_s}.log"

    copy_log_file backup_folder, File.join(log_folder, default_log_file)
  else
    log_folder = FileUtils.pwd
  end

  Cornucopia::Util::Configuration.user_log_files.each do |relative_log_file, options|
    copy_log_file backup_folder, File.join(log_folder, relative_log_file)
  end
end

.capture_logs(report_table) ⇒ Object

This function will capture the logs and output them to the report



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# File 'lib/cornucopia/util/log_capture.rb', line 47

def capture_logs(report_table)
  if report_table
    if Object.const_defined?("Rails")
      log_folder = Rails.root.to_s
      if (log_folder =~ /\/features\/?$/ || log_folder =~ /\/spec\/?$/)
        log_folder = File.join(log_folder, "../")
      end

      default_log_file = "log/#{Rails.env.to_s}.log"

      output_log_file(report_table, File.join(log_folder, default_log_file))
    else
      log_folder = FileUtils.pwd
    end

    Cornucopia::Util::Configuration.user_log_files.each do |relative_log_file, options|
      output_log_file(report_table, File.join(log_folder, relative_log_file), options)
    end
  else
    Cornucopia::Util::ReportBuilder.current_report.within_section("Log Dump:") do |report|
      report.within_table do |new_report_table|
        Cornucopia::Util::LogCapture.capture_logs new_report_table
      end
    end
  end
end

.copy_log_file(dest_folder, source_file) ⇒ Object 



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# File 'lib/cornucopia/util/log_capture.rb', line 29

def copy_log_file(dest_folder, source_file)
  extension = File.extname(source_file)
  file_name = File.basename(source_file, extension)
  dest_name = File.join(dest_folder, "#{file_name}#{extension}")
  index     = 0

  while File.exists?(dest_name)
    index     += 1
    dest_name = File.join(dest_folder, "#{file_name}_#{index}#{extension}")
  end

  if File.exists?(source_file)
    FileUtils.mkdir_p File.dirname(dest_name)
    FileUtils.cp source_file, dest_name
  end
end

.highlight_log_output(log_text) ⇒ Object 



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# File 'lib/cornucopia/util/log_capture.rb', line 74

def highlight_log_output(log_text)
  output_text = Cornucopia::Util::ReportBuilder.format_code_refs(log_text)
  output_text = output_text.gsub(/^(Completed [^23].*)$/, "<span class=\"completed-error\">\\1<\/span>")
  output_text = output_text.gsub(/^(Completed [23].*)$/, "<span class=\"completed-other\">\\1<\/span>")

  output_text.html_safe
end

.output_log_file(report_table, log_file_name, options = {}) ⇒ Object

A cheap and sleazy tail function, but it should work...



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# File 'lib/cornucopia/util/log_capture.rb', line 83

def output_log_file(report_table, log_file_name, options = {})
  if File.exists?(log_file_name)
    output_file = false

    options.reverse_merge!({ num_lines: Cornucopia::Util::Configuration.num_lines })

    num_lines  = options[:num_lines] || Cornucopia::Util::Configuration.num_lines
    num_lines  = Cornucopia::Util::Configuration.num_lines if num_lines <= 0
    log_buffer = ""
    file_size  = File.size(log_file_name)

    File.open(log_file_name) do |log_file|
      seek_len = [file_size, TAIL_BUF_LENGTH].min
      log_file.seek -seek_len, IO::SEEK_END

      while (log_buffer.count("\n") <= num_lines)
        log_buffer = log_file.read(seek_len) + log_buffer

        file_size -= seek_len
        seek_len  = [file_size, TAIL_BUF_LENGTH].min

        break if seek_len <= 0

        log_file.seek -seek_len - TAIL_BUF_LENGTH, IO::SEEK_CUR
      end
    end

    if log_buffer
      log_buffer = log_buffer.split("\n")
      if (log_buffer.length > num_lines)
        log_buffer = log_buffer[-num_lines..-1]
      end

      report_table.write_stats File.basename(log_file_name),
                               Cornucopia::Util::PrettyFormatter.format_string(
                                   Cornucopia::Util::LogCapture.highlight_log_output(
                                       "log_file - #{log_file_name}:#{file_size}\n#{log_buffer.join("\n")}"
                                   )
                               ),
                               do_not_pretty_print: true

      output_file = true
    end

    output_file
  end
end