Class: SvelteOnRails::SsrServer

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/svelte_on_rails/ssr_server.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SsrServer

Returns a new instance of SsrServer.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 22

def initialize

  SvelteOnRails::Lib::Utils.secure_debug_log("SOR Server initialize called")

  @helpers = SsrServerHelpers.new

  @logfile_path = Rails.root.join("log/svelte-ssr-server-#{Rails.env}.log")
  @logfile_max_lines = build_logfile_max_lines
  @socket_path = @helpers.socket_path
  @use_ssr_server = SvelteOnRails::Configuration.instance.configs[:use_ssr_server]
  @node_bin = SvelteOnRails::Configuration.instance.node_bin_path
  @ssr_server_bin_path = SvelteOnRails::Configuration.instance.ssr_server_bin_path

    if @use_ssr_server
      # if !defined?(Rails::Server)
      #   SvelteOnRails::Lib::Utils.secure_debug_log("Rails Server is not yet defined, SSR Server cannot be started because of initializing too early")
      # else

      SvelteOnRails::Lib::Utils.secure_debug_log("SOR using svelte-ssr-server called, now starting node-server...")

      start_node_server!
      # end
      at_exit do
        kill_my_server
      end
    else
      SvelteOnRails::Lib::Utils.secure_debug_log("SSR Server NOT used => @use_ssr_server #{@use_ssr_server}")
      SvelteOnRails::Lib::Utils.secure_debug_log("SSR Server NOT used => @use_ssr_server #{defined?(Rails::Server)}")
    end

end

Instance Attribute Details

#logfile_max_lines ⇒ Object (readonly)

Returns the value of attribute logfile_max_lines.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def logfile_max_lines
  @logfile_max_lines
end

#logfile_path ⇒ Object (readonly)

Returns the value of attribute logfile_path.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def logfile_path
  @logfile_path
end

#node_bin ⇒ Object (readonly)

Returns the value of attribute node_bin.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def node_bin
  @node_bin
end

#socket_path ⇒ Object (readonly)

Returns the value of attribute socket_path.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def socket_path
  @socket_path
end

#ssr_server_bin_path ⇒ Object (readonly)

Returns the value of attribute ssr_server_bin_path.



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# File 'lib/svelte_on_rails/ssr_server.rb', line 9

def ssr_server_bin_path
  @ssr_server_bin_path
end

Class Method Details

.instance ⇒ Object

methods



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# File 'lib/svelte_on_rails/ssr_server.rb', line 17

def self.instance
  SvelteOnRails::Lib::Utils.secure_debug_log("SOR Server instance called")
  @instance ||= new
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/ssr_server.rb', line 269

def alive?
  @alive
end

#configured? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/ssr_server.rb', line 142

def configured?
  @configured ||= File.exist?(@ssr_server_bin_path)
end

#kill_leftover_processes ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 225

def kill_leftover_processes
  stdout, stderr, status = Open3.capture3(
    "ps aux | grep svelte"
  )

  leftover = stdout.split("\n").map do |line|
    if line.match?(/\/#{@socket_namespace}-[0-9]+.sock$/)
      unless line.match?(/\/#{@socket_namespace}-#{Process.ppid}.sock$/)
        line.match(/[0-9]+/).to_s.to_i
      end
    end
  end.compact

  stdout, stderr, status = Open3.capture3(
    "kill #{leftover.join(' ')}"
  )

  start_server_log(nil, "Killed #{leftover.length} leftover processes") if leftover.length >= 1
end

#kill_my_server ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 245

def kill_my_server
  Process.kill("SIGINT", (node_server_pid || 0)) if node_server_pid
  File.delete(@helpers.ssr_server_ppid_file)
rescue

end

#node_server_pid ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 273

def node_server_pid
  stdout, stderr, status = Open3.capture3(
    "ps aux | grep svelte"
  )
  stdout.split("\n").each do |line|
    if line.include?("#{@socket_namespace}-#{Process.ppid}.sock")
      return line.match(/[0-9]+/).to_s.to_i
    end
  end
  nil
end

#parse_body_json(response_string) ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 132

def parse_body_json(response_string)
  return {} unless response_string.to_s.present?

  body = response_string.split("\r\n\r\n", 2)[1]
  json_start = body.index('{')
  json_end = body.rindex('}')
  json_str = body[json_start..json_end]
  JSON.parse(json_str)
end

#ping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/svelte_on_rails/ssr_server.rb', line 146

def ping?
  @alive = false
  shorten_logfile
  unless File.exist?(socket_path)
    return false
  end
  response = ''
  begin
    sock = UNIXSocket.new(socket_path)
    request = "GET /health HTTP/1.1\r\nHost: localhost\r\nConnection: close\r\n\r\n"
    sock.write(request)
    response = sock.read
    sock.close
  rescue => e
    puts "[SOR] Ping Failed: #{e.message}"
  end
  if response.match?(/^HTTP\/\d\.\d 200/)
    r = parse_body_json(response)
    unless r['version'].split('.').first.to_i >= 14
      puts "[SOR] WARNING: Required SSR Server version is at least 14.x, you have installed @csedl/svelte-on-rails: #{r['version']}"
    end
    @alive = r['status'] == 'alive'
  end
end

#render(component, props, debug, view_path_proc) ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 54

def render(component, props, debug, view_path_proc)

  # fetch asset
  manifest = SvelteOnRails::Configuration.instance.manifest(debug, component[:name])
  _asset_path = manifest[component[:path]]['file']
  full_asset_path = Rails.root.join('public', 'svelte-ssr', _asset_path)

  body_json = { component: full_asset_path, props: props }.to_json

  request = "POST /render HTTP/1.1\r\n" +
            "Host: localhost\r\n" +
            "Content-Type: application/json\r\n" +
            "Content-Length: #{body_json.bytesize}\r\n" +
            "Connection: close\r\n\r\n"

  begin
    socket = UNIXSocket.new(socket_path)
    socket.write(request + body_json)
    response = socket.read
    socket.close
  rescue => e
    Thread.new { restart_my_server }
    if e.is_a?(Errno::ECONNREFUSED)
      SvelteOnRails::Lib::Utils.error_log(
        :ssr_server_unreachable,
        "Render #{component[:file_basename]}.svelte",
        [
          "The SSR Server is not reachable.\nYou may need to restart your app.",
          "#{e}",
          SvelteOnRails::Lib::Utils.backtrace_until_sor(e).join("\n")
        ]
      )
      return { success: false, ssr_server_unreachable: true }
    else
      raise e
    end
  end

  shorten_logfile

  raw_response = parse_body_json(response)
  if raw_response['status'] == 'SUCCESS'
    htm = raw_response['html'].to_s
                              .gsub('<!--[-->', '')
                              .gsub('<!--]-->', '')
                              .gsub('<!---->', '')

    {
      success: true,
      html: htm,
      head: raw_response['head'].to_s,
    }
  else
    config = SvelteOnRails::Configuration.instance
    comp = Rails.root.join(component[:path]).to_s
    imps = if config.watch_changes?
             _src = config.fetch_source_files(component[:path], false, '')
             sources = _src.select { |f| f != comp }
             (sources.present? ? "\nImports:\n#{sources.join("\n")}" : '')
           else
             ''
           end
    utils = SvelteOnRails::Lib::Utils
    utils.error_log(
      :render_failed,
      "Render #{component[:file_basename]}.svelte",
      [
        raw_response['logs'].to_a.join("\n"),
        "View:\n#{view_path_proc.call}\nComponent:\n#{Rails.root.join(component[:path]).to_s}#{imps}",
      ]
    )
    {
      success: false,
    }
  end

end

#restart_my_server ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 252

def restart_my_server
  return unless @server_restarted_time > 1.minutes.ago

  msg = "Restarting SSR server"
  Rails.logger.error(msg)
  SvelteOnRails::Lib::Utils.secure_debug_log("[ERROR] #{msg}")

  @server_restarted_count ||= 0
  @server_restarted_count += 1
  kill_my_server
  begin
    start_node_server!("Restart-after-failure-#{@server_restarted_count}")
    @server_restarted_time = Time.now
  rescue
  end
end

#start_node_server!(started_by = "rails-boot-#{Rails.env}-#{Process.ppid}") ⇒ Object 



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# File 'lib/svelte_on_rails/ssr_server.rb', line 171

def start_node_server!(started_by = "rails-boot-#{Rails.env}-#{Process.ppid}")

  SvelteOnRails::Lib::Utils.secure_debug_log("SOR start_node_server! called")

  # notice ppid
  FileUtils.mkdir_p(@helpers.ssr_server_ppid_file.dirname)
  File.write(@helpers.ssr_server_ppid_file, Process.ppid.to_s)

  start = Time.now
  cmd = [
    "SVELTE_SSR_SERVER_STARTED_BY=r#{started_by}",
    @node_bin,
    @ssr_server_bin_path,
    @socket_path
  ].join(' ')

  @node_server_output = {}
  Thread.new do
    stdout, stderr, status = Open3.capture3(
      cmd,
      chdir: Rails.root
    )
    @node_server_output = {
      stdout: stdout,
      stderr: stderr,
      status: status
    }
  end
  start_server_log(start, "Node Version: #{Configuration.instance.node_version_test}, package version: #{Configuration.instance.npm_package_version_test}")
  start_server_log(start, "Start running Svelte-SSR-Server... (#{started_by})")

  until node_server_pid do
    sleep 0.12
    start_server_log(start, "Waiting for node server process-id")
    start_server_timeout!(start)
  end

  until File.exist?(socket_path) do
    sleep 0.1
    start_server_log(start, "Waiting for socket to be created")
    start_server_timeout!(start)
  end
  start_server_log(start, "Socket created: #{socket_path}")

  until ping? do
    start_server_log(start, "Waiting for successful server-response")
    start_server_timeout!(start)
    sleep 0.1
  end
  start_server_log(start, "Server responded successfully")

  kill_leftover_processes
end