Class: Yast::LogViewCoreClass

Inherits:
Module
  • Object
show all
Defined in:
library/log/src/modules/LogViewCore.rb

Instance Method Summary collapse

Instance Method Details

#DeleteOldLines ⇒ Object

Remove unneeded items from a list of lines If max_lines is 0, then don't remove anything



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# File 'library/log/src/modules/LogViewCore.rb', line 84

def DeleteOldLines
  max_lines = Ops.get_integer(@data, "max_lines", @max_lines_default)
  return if max_lines == 0

  if Ops.greater_than(
    Ops.subtract(Ops.subtract(Builtins.size(@lines), max_lines), 1),
    0
  )
    @lines = Builtins.sublist(
      @lines,
      Ops.subtract(Ops.subtract(Builtins.size(@lines), max_lines), 1)
    )
  end

  nil
end

#GetLines ⇒ Object 



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# File 'library/log/src/modules/LogViewCore.rb', line 219

def GetLines
  deep_copy(@lines)
end

#GetNewLines ⇒ Object 



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# File 'library/log/src/modules/LogViewCore.rb', line 61

def GetNewLines
  return [] if !@is_running

  if !Convert.to_boolean(SCR.Read(path(".process.running"), @id))
    @is_running = false
    Report.Error(_("Error occurred while reading the log."))
    return []
  end

  new_lines = []

  loop do
    line = Convert.to_string(SCR.Read(path(".process.read_line"), @id))
    break if line.nil?

    new_lines = Builtins.add(new_lines, line)
  end

  deep_copy(new_lines)
end

#main ⇒ Object 



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# File 'library/log/src/modules/LogViewCore.rb', line 34

def main
  Yast.import "UI"

  textdomain "base"

  Yast.import "Report"

  # default value of maximum displayed lines
  @max_lines_default = 100

  # lines of the log
  @lines = []

  # data describing log:
  #   file:       filename to read from
  #   grep:       grep file with expression
  #   command:    command to run (use instead of file and grep)
  #   max_lines:  max lines to keep (0 -> infinite)
  @data = {}

  # id of background process
  @id = nil

  # flag indicating if background process is (or should be) running
  @is_running = false
end

#Start(widget, data) ⇒ Object

Starts the log reading command via process agent.

The LogView widget must exist when calling this function. The `MaxLines parameter of the widget will be set.



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# File 'library/log/src/modules/LogViewCore.rb', line 105

def Start(widget, data)
  widget = deep_copy(widget)
  data = deep_copy(data)
  if !@id.nil?
    SCR.Execute(path(".process.release"), @id)
    @id = nil
  end

  @data = deep_copy(data)

  file = Ops.get_string(@data, "file", "")
  grep = Ops.get_string(@data, "grep", "")
  command = Ops.get_string(@data, "command", "")
  max_lines = Ops.get_integer(@data, "max_lines", @max_lines_default)

  if command == ""
    if grep == ""
      command = Builtins.sformat("/usr/bin/tail -n %1 -f %2",
        max_lines.to_s.shellescape, file.shellescape)
    else
      command = Builtins.sformat(
        "tail -n +0 -f %1 | grep --line-buffered %2",
        file.shellescape,
        grep.shellescape
      )

      if max_lines != 0
        lc_command = Builtins.sformat(
          "/usr/bin/grep -c %2 %1",
          file.shellescape,
          grep.shellescape
        )
        bash_output = Convert.to_map(
          SCR.Execute(path(".target.bash_output"), lc_command)
        )
        if Ops.get_integer(bash_output, "exit", 1) == 0
          lc = Builtins.filterchars(
            Ops.get_string(bash_output, "stdout", ""),
            "1234567890"
          )
          lines_count = Builtins.tointeger(lc)

          # don't know why without doubling it discards more lines,
          # out of YaST2 it works
          lines_count = Ops.subtract(
            lines_count,
            Ops.multiply(2, max_lines)
          )
          lines_count = 0 if Ops.less_than(lines_count, 0)

          command << Builtins.sformat(" | tail -n +%1", lines_count.to_s.shellescape) if Ops.greater_than(lines_count, 0)
        end
      end
    end
  end

  Builtins.y2milestone("Calling process agent with command %1", command)

  @id = Convert.to_integer(
    SCR.Execute(path(".process.start_shell"), command, "tty" => true)
  )
  @is_running = true

  Builtins.sleep(100)

  @lines = GetNewLines()
  DeleteOldLines()

  UI.ChangeWidget(widget, :MaxLines, max_lines)
  UI.ChangeWidget(
    widget,
    :Value,
    Builtins.mergestring(Builtins.maplist(@lines) do |line|
      Ops.add(line, "\n")
    end, "")
  )

  nil
end

#Stop ⇒ Object 



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# File 'library/log/src/modules/LogViewCore.rb', line 210

def Stop
  if !@id.nil?
    SCR.Execute(path(".process.release"), @id)
    @id = nil
  end

  nil
end

#Update(widget) ⇒ Object 



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# File 'library/log/src/modules/LogViewCore.rb', line 185

def Update(widget)
  widget = deep_copy(widget)
  if !@id.nil?
    new_lines = GetNewLines()
    if Ops.greater_than(Builtins.size(new_lines), 0)
      @lines = Convert.convert(
        Builtins.merge(@lines, new_lines),
        from: "list",
        to:   "list <string>"
      )
      DeleteOldLines()

      UI.ChangeWidget(
        widget,
        :LastLine,
        Builtins.mergestring(Builtins.maplist(new_lines) do |line|
          Ops.add(line, "\n")
        end, "")
      )
    end
  end

  nil
end