Class: Zillabyte::Runner::ComponentRunner

Inherits:
Command::Base show all
Includes:
Helpers
Defined in:
lib/zillabyte/runner/component_runner.rb

Overview

HIDDEN:

Constant Summary

Constants inherited from Command::Base

Command::Base::META_COLUMNS

Instance Attribute Summary

Attributes inherited from Command::Base

#args, #options

Instance Method Summary collapse

Methods included from Helpers

#add_git_remote, #app, #ask, #create_git_remote, #error, #extract_app_from_git_config, #extract_app_in_dir, #format_with_bang, #get_flow_name, #git, #handle_downloading_manifest, #has_git?, #longest, #read_multiline, #with_tty

Methods inherited from Command::Base

alias_command, #api, extract_banner, extract_description, extract_help, extract_help_from_caller, extract_options, extract_summary, inherited, #initialize, method_added, namespace

Constructor Details

This class inherits a constructor from Zillabyte::Command::Base

Instance Method Details

#cdisplay(name, message) ⇒ Object 



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# File 'lib/zillabyte/runner/component_runner.rb', line 191

def cdisplay(name, message)
   color = @colors[name] || :default
    if message == ""
      display ""
    else
      display "#{name} - #{message}".colorize(color)
    end
end

#describe_component(meta) ⇒ Object 



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# File 'lib/zillabyte/runner/component_runner.rb', line 205

def describe_component(meta)
  colors ||= [:green, :yellow, :magenta, :cyan, :white, :blue, :light_yellow, :light_blue, :red, :light_magenta, :light_cyan]
  rjust = 20

  display "#{'component name'.rjust(rjust)}: #{meta['name']}"
  display "#{'component language'.rjust(rjust)}: #{meta['language']}"
  meta['nodes'].each_with_index do |node, index|
    color = @colors[node['name']] ||= colors[index % colors.length]
    display (("="*rjust + "  operation ##{index}").colorize(color))
    display "#{"name".rjust(rjust)}: #{node['name'].to_s.colorize(color)}"

    # Convert metadata typing to that of components
    if node['type'] == "source"
      type = "input"
      display "#{"type".rjust(rjust)}: #{type.to_s.colorize(color)}"
      display "#{"fields".rjust(rjust)}: #{node['fields'].to_s.colorize(color)}"
      display "#{"matches".rjust(rjust)}: #{JSON.pretty_generate(node['matches']).indent(rjust+2).lstrip.colorize(color)}" if node['matches']
    elsif node['type'] == "sink"
      type = "output"
      display "#{"type".rjust(rjust)}: #{type.to_s.colorize(color)}"
      display "#{"columns".rjust(rjust)}: #{node['columns'].to_s.colorize(color)}"

    else
      type = node['type']
      display "#{"type".rjust(rjust)}: #{type.to_s.colorize(color)}"
    end
  end
end

#display(message, newline = true) ⇒ Object 



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# File 'lib/zillabyte/runner/component_runner.rb', line 201

def display(message, newline = true)
  @session.display(message, newline)
end

#run(meta, dir = Dir.pwd, session = nil, options = {}) ⇒ Object 



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# File 'lib/zillabyte/runner/component_runner.rb', line 11

def run (meta, dir = Dir.pwd, session = nil, options = {})

  if meta.nil? or session.nil?
    return
  end

  @session = session
  @colors = {}

  # Get options
  input = options[:input]
  output = options[:output]
  otype = options[:output_type] 

  # Show the user what we know about their app... 
  display "inferring your app details..."
  describe_component(meta)

  # Setup streams
  @nodes = meta["nodes"]

  # Index stream consummers and emitters by stream name
  @arcs = meta["arcs"]

  # Organize component pipes
  @operations = {}
  @operation_pipes = {}


  # Start component
  begin

    # Setup operation pipes
    @nodes.each do |n|

      name = n["name"]
      type = n["type"]
      if n["type"] ==  "source"
        fields = n["fields"]
      end
      
      # Create two new pipes in the parent.
      rd_child, wr_parent = IO.pipe()
      rd_parent, wr_child = IO.pipe()

      @operation_pipes[name] = {
        :node => n,
        :rd_child => rd_child,      
        :wr_child => wr_child,
        :rd_parent => rd_parent,        
        :wr_parent => wr_parent
      }
    end

    # Maps origin => {stream => [destinations]}
    @arc_map = {}
    @arcs.each do |a|
      origin = a["origin"]
      name = a["name"]
      dest = a["dest"]
      @arc_map[origin] ||= {}
      @arc_map[origin][name] ||= []
      @arc_map[origin][name] << a["dest"]
    end


    # Spawn component threads
    @nodes.each do |n|

      name = n["name"]
      type = n["type"]
      emits = n["emits"]

      pipes = @operation_pipes[name] 
      rd_child = pipes[:rd_child]
      wr_child = pipes[:wr_child]
      rd_parent = pipes[:rd_parent]        
      wr_parent = pipes[:wr_parent]

      # Fork.
      pid = fork()
      if pid # In parent
        # Close the reading end of the child so we can write to the child.
        rd_child.close()
        # Close the writing end of the child so we can read from the child.
        wr_child.close()

      else # in child
        # Close the writing end of the parent so we can read from the parent.
        wr_parent.close()
        # Close the reading end of the parent so we can write to the parent.
        rd_parent.close()
        begin

          # Setup reading and writing pipes for communicating with consumee component
          in_pipe = {:rd_child => @operation_pipes[name][:rd_child], :wr_child => @operation_pipes[name][:wr_child]}

          # Index consumer pipes by consumer_name
          out_pipes = {}

          if type != "sink"
            @arc_map[name].each_pair do |stream, destinations|
              out_pipes[stream] ||= {}
              destinations.each do |dest|
                out_pipes[stream][dest] = {:wr_parent => @operation_pipes[dest][:wr_parent], :rd_parent => @operation_pipes[dest][:rd_parent] }
              end
            end
          end

          # Run the child process 
          Zillabyte::Runner::ComponentOperation.run(n, dir, in_pipe, out_pipes, self, meta, options)

       rescue => e
        display e

        ensure
          # Close the reading end of the child
          rd_child.close()
          # Close the writing end of the child
          wr_child.close()
          exit!(-1)
        end

      end #end child
    end 


    # If no input file, read from STDIN
    # TODO handle inputs
    if input.nil?

      source = ""
      @nodes.each do |n|
        name = n["name"]
        type = n["type"]

        if type == "source"
          if source == ""
            source = name
          else
            display "Cannot run component with multiple input sources without input files"
            return
          end
        end
      end
        
      display ""
      display "To view results:  Enter 'end'    "
      display "To exit the test: Enter 'Ctrl-C' "
      display ""

      while true

        # TODO this doesnt handle multiple sources
        #source = @operation_pipes["source_1"][:node]

        display "Enter an input tuple in JSON format i.e.{ \"url\" : \"foo.com\", \"html\" : \"bar.html\" }"
        msg = ask
        # Send tuple to source
        @operation_pipes[source][:wr_parent].puts msg
      end
    end
 
  ensure
    Process.waitall()
    @operation_pipes.each do |name, pipes|
      #Close the  writing end of the parent
      pipes[:wr_parent].close()
      # Close the reading end of the parent
      pipes[:rd_parent].close()
    end
  end

end

#session ⇒ Object 



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# File 'lib/zillabyte/runner/component_runner.rb', line 186

def session
  @session
end