Class: OsCtl::Cli::Tree

Inherits:
Object
  • Object
show all
Includes:
CGroupParams, Lib::Utils::Humanize
Defined in:
lib/osctl/cli/tree.rb

Constant Summary collapse

DECORATIONS = 
{
  ascii: {
    branch: '|-- ',
    leaf: '`-- ',
    continuation: '|   '
  },
  unicode: {
    branch: '├── ',
    leaf: '└── ',
    continuation: '│   '
  }
}.freeze

Constants included from CGroupParams

CGroupParams::CGPARAM_DEFAULT_FIELDS, CGroupParams::CGPARAM_FIELDS, CGroupParams::CGPARAM_FILTERS, CGroupParams::CGPARAM_STATS

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from CGroupParams

#cg_add_raw_cgroup_params, #cg_add_stats, #cg_init_subsystems, #cg_list_raw_cgroup_params, #do_cgparam_apply, #do_cgparam_list, #do_cgparam_replace, #do_cgparam_set, #do_cgparam_unset, #do_set_cpu_limit, #do_set_memory, #do_unset_cpu_limit, #do_unset_memory, #parse_cgparams, #parse_subsystem

Constructor Details

#initialize(pool, parsable: false, color: true, containers: false) ⇒ Tree

Returns a new instance of Tree.



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# File 'lib/osctl/cli/tree.rb', line 29

def initialize(pool, parsable: false, color: true, containers: false)
  @pool = pool
  @parsable = parsable
  @containers = containers

  Rainbow.enabled = color
end

Instance Attribute Details

#client ⇒ Object (readonly, protected)

Returns the value of attribute client.



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# File 'lib/osctl/cli/tree.rb', line 101

def client
  @client
end

#cts ⇒ Object (readonly, protected)

Returns the value of attribute cts.



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# File 'lib/osctl/cli/tree.rb', line 101

def cts
  @cts
end

#groups ⇒ Object (readonly, protected)

Returns the value of attribute groups.



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# File 'lib/osctl/cli/tree.rb', line 101

def groups
  @groups
end

#parsable ⇒ Object (readonly, protected)

Returns the value of attribute parsable.



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# File 'lib/osctl/cli/tree.rb', line 101

def parsable
  @parsable
end

#pool ⇒ Object (readonly, protected)

Returns the value of attribute pool.



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# File 'lib/osctl/cli/tree.rb', line 101

def pool
  @pool
end

Class Method Details



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# File 'lib/osctl/cli/tree.rb', line 23

def self.print(*, **)
  tree = new(*, **)
  tree.render
  tree.print
end

Instance Method Details

#decorations ⇒ Object (protected) 



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# File 'lib/osctl/cli/tree.rb', line 169

def decorations
  if ENV['LANG']
    DECORATIONS[/UTF-8/i =~ ENV['LANG'] ? :unicode : :ascii]

  else
    DECORATIONS[:ascii]
  end
end

#fetch ⇒ Object (protected) 



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# File 'lib/osctl/cli/tree.rb', line 103

def fetch
  @client = OsCtl::Client.new
  @client.open

  cg_init_subsystems(@client)

  @groups = @client.cmd_data!(:group_list, pool:).sort! do |a, b|
    a[:name] <=> b[:name]
  end

  @cts = @client.cmd_data!(:ct_list, pool:) if @containers
end

#preprocess ⇒ Object (protected) 



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# File 'lib/osctl/cli/tree.rb', line 116

def preprocess
  groups.map! do |grp|
    # Read cgroup params
    cg_add_stats(
      grp,
      grp[:full_path],
      %i[memory cpu_us],
      parsable
    )

    # Supply parameters for renderer
    if grp[:name] == '/'
      grp[:parts] = ['/']
      grp[:shortname] = '/'
      grp[:parent] = nil

    else
      parts = grp[:name].split('/')
      grp[:parts] = parts
      grp[:shortname] = parts.last
      grp[:parent] = parts[0..-2].join('/')
      grp[:parent] = '/' if grp[:parent].empty?
    end

    # If containers aren't included, we're done
    next grp unless cts

    # Skip the group if it has no direct nor indirect containers
    next unless cts.detect { |ct| ct[:group].start_with?(grp[:name]) }

    # Include group's containers
    group_cts = cts.select { |ct| ct[:group] == grp[:name] }.sort! do |a, b|
      a[:id] <=> b[:id]
    end.map! do |ct|
      cg_add_stats(
        ct,
        ct[:group_path],
        %i[memory cpu_us],
        parsable
      )

      ct[:parts] = ct[:group].split('/') << ct[:id]
      ct[:shortname] = ct[:id]
      ct[:parent] = ct[:group]
      ct
    end

    [grp, group_cts]
  end
  groups.compact!
  groups.flatten!
end

#print ⇒ Object 



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# File 'lib/osctl/cli/tree.rb', line 87

def print
  OsCtl::Lib::Cli::OutputFormatter.print(
    groups,
    cols: [
      { label: cts ? 'GROUP/CONTAINER' : 'GROUP', name: :branch },
      :memory,
      :cpu_us
    ],
    layout: :columns, color: Rainbow.enabled
  )
end

#render ⇒ Object 



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# File 'lib/osctl/cli/tree.rb', line 37

def render
  fetch
  preprocess

  decor = decorations
  i = 0

  groups.map! do |grp|
    # Look ahead to see if the group has any more siblings on the same level
    has_sibling = groups[i + 1..].detect { |g| g[:parent] == grp[:parent] }

    dir_indent = if has_sibling
                   decor[:branch]
                 else
                   decor[:leaf]
                 end

    res = ''

    # For every level, we need to find out whether the groups have any siblings
    # on that level
    t = ''
    res << grp[:parts][0..-3].inject('') do |acc, v|
      t = File.join(t, v)

      has_sibling = groups[i + 1..].detect { |g| g[:parent] == t }

      acc << if has_sibling
               decor[:continuation]
             else
               '    '
             end
    end

    res << dir_indent if grp[:parent]

    res << if grp.has_key?(:name)
             Rainbow(grp[:shortname]).blue.bright

           else
             Rainbow(grp[:shortname]).red.bright
           end

    grp[:branch] = res

    i += 1
    grp
  end
end