Class: MassiveImport::DashboardServer

Inherits:
Object
  • Object
show all
Defined in:
lib/massive-import/dashboard_server.rb

Instance Method Summary collapse

Instance Method Details

#batches_table(batches) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 131

def batches_table(batches)
  return '<p>No batches yet.</p>' if batches.empty?

  rows = batches.map do |b|
    started = b.started_at ? Time.at(b.started_at.to_i).strftime('%Y-%m-%d %H:%M:%S') : '-'
    ["##{b.id}", b.attempt, h(b.status), b.start_id, b.end_id, started]
  end

  table(['Batch', 'Attempt', 'Status', 'Start ID', 'End ID', 'Started'], rows)
end

#dispatch(request, response, logger) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 35

def dispatch(request, response, logger)
  unless request.request_method == 'GET'
    respond(response, 405, layout(request, 'Method not allowed', '<h1>405 Method Not Allowed</h1>'))
    return
  end

  title, content = yield

  if content
    respond(response, 200, layout(request, title, content))
  else
    respond(response, 404, layout(request, 'Not found', '<h1>404 Not Found</h1><p><a href="/">Back to imports</a></p>'))
  end
rescue => e
  logger.info("Unhandled exception: message=#{e.message}")
  logger.info("Unhandled exception: trace=#{e.backtrace}")
  respond(response, 500, layout(request, 'Error', "<h1>500 Internal Server Error</h1><p><a href=\"/\">Back to imports</a></p>"))
end

#h(text) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 156

def h(text)
  CGI.escapeHTML(text.to_s)
end

#home(request) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 54

def home(request)
  render_imports if request.path_info == '/'
end

#import(request) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 58

def import(request)
  render_import($1.to_i) if request.path_info =~ %r{\A/(\d+)\z}
end

#layout(request, title, content) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 160

def layout(request, title, content)
  refresh = request.query['refresh'].to_i
  refresh_html = +''
  refresh_html << %(<meta http-equiv="refresh" content="#{refresh}">) if refresh > 0

  <<~HTML
    <!DOCTYPE html>
    <html lang="en">
    <head>
      <meta charset="utf-8">
      #{refresh_html}
      <title>#{h(title)}</title>
    </head>
    <body>
      #{content}
    </body>
    </html>
  HTML
end

#render_import(id) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 89

def render_import(id)
  imp = Import.find_by(id: id)
  return ['Not found', '<h1>Import not found</h1><p><a href="/">Back to imports</a></p>'] unless imp

  batch_stats  = Batch.where(import_id: imp.id).group(:status).count
  record_stats = Record.where(import_id: imp.id).group(:status).count
  batches = Batch.where(import_id: imp.id).order(id: :desc).limit(100).to_a

  summary_headers = ['Processor', 'Attempt', 'Total records', 'Batched records', 'Concurrency', 'Batch size']
  summary_values = [
    h(imp.processor_class),
    "#{imp.attempt} / #{imp.max_attempts}",
    imp.total_records,
    "#{imp.batch_records} / #{imp.total_records}",
    "#{imp.current_batch_concurrency} / #{imp.max_batch_concurrency}",
    imp.batch_size
  ]

  content = +''
  content << %(<p><a href="/">&larr; All imports</a></p>)
  content << "<h1>Import ##{imp.id} (#{h(imp.status)})</h1>"
  content << table(summary_headers, [summary_values])

  content << '<h2>Batches by status</h2>'
  content << stats_table(batch_stats)
  content << '<h2>Records by status</h2>'
  content << stats_table(record_stats)
  content << '<h2>Recent 100 batches</h2>'
  content << batches_table(batches)

  ["Import ##{imp.id}", content]
end

#render_imports ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 68

def render_imports
  imports = Import.order(id: :desc).to_a
  return ['Imports', '<h1>Imports</h1><p>No imports found.</p>'] if imports.empty?

  headers = ['ID', 'Status', 'Processor', 'Attempt', 'Total', 'Batched', 'Concurrency', 'Batch size']
  rows = imports.map do |imp|
    [
      %(<a href="/imports/#{imp.id}">##{imp.id}</a>),
      h(imp.status),
      h(imp.processor_class),
      "#{imp.attempt} / #{imp.max_attempts}",
      imp.total_records,
      "#{imp.batch_records} / #{imp.total_records}",
      "#{imp.current_batch_concurrency} / #{imp.max_batch_concurrency}",
      imp.batch_size
    ]
  end

  ['Imports', "<h1>Imports</h1>#{table(headers, rows)}"]
end

#respond(response, status, body) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 62

def respond(response, status, body)
  response.status = status
  response['Content-Type'] = 'text/html; charset=utf-8'
  response.body = body
end

#start(**options) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 6

def start(**options)
  port = options.fetch(:dashboard_port, (ENV["dashboard_port"] || 9292).to_i)
  host = options.fetch(:dashboard_host, ENV["dashboard_host"] || "127.0.0.1")

  logger = WEBrick::Log.new($stdout, WEBrick::Log::INFO)
  server = WEBrick::HTTPServer.new(
    BindAddress: host,
    Port: port,
    Logger: logger,
    AccessLog: []
  )

  server.mount_proc('/') do |request, response|
    dispatch(request, response, logger) do
      home(request)
    end
  end

  server.mount_proc('/imports') do |request, response|
    dispatch(request, response, logger) do
      import(request)
    end
  end

  %w[INT TERM].each { |signal| trap(signal) { server.shutdown } }

  server.start
end

#stats_table(stats) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 122

def stats_table(stats)
  return '<p>None.</p>' if stats.empty?

  rows = stats.map { |status, count| [h(status), count] }
  rows << ['<strong>Total</strong>', "<strong>#{stats.values.sum}</strong>"]

  table(['Status', 'Count'], rows)
end

#table(headers, rows) ⇒ Object 



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# File 'lib/massive-import/dashboard_server.rb', line 142

def table(headers, rows)
  head = headers.empty? ? '' : "<thead><tr>#{headers.map { |header| "<th>#{header}</th>" }.join}</tr></thead>"
  body = rows.map do |cells|
    "<tr>#{cells.map { |cell| "<td>#{cell}</td>" }.join}</tr>"
  end.join

  <<~TABLE
    <table border="1" cellpadding="4" cellspacing="0">
      #{head}
      <tbody>#{body}</tbody>
    </table>
  TABLE
end