Class: Opal::SimpleServer

Inherits:
Object
  • Object
show all
Defined in:
opal/lib/opal/simple_server.rb

Overview

Opal::SimpleServer is a very basic Rack server for Opal assets, it relies on Opal::Builder and Ruby corelib/stdlib. It's meant to be used just for local development.

For a more complete implementation see opal-sprockets (Rubygems) or opal-webpack (NPM).

Examples:

(CLI)

rackup -ropal -ropal/simple_server -b 'Opal.append_path("app"); run Opal::SimpleServer.new'

Constant Summary collapse

NotFound =
Class.new(StandardError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) {|_self| ... } ⇒ SimpleServer

Returns a new instance of SimpleServer.

Yields:

  • (_self)

Yield Parameters:


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# File 'opal/lib/opal/simple_server.rb', line 20

def initialize(options = {})
  @prefix = options.fetch(:prefix, 'assets')
  @main = options.fetch(:main, 'application')
  @index_path = nil
  yield self if block_given?
  freeze
end

Instance Attribute Details

#index_pathObject

Returns the value of attribute index_path.


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# File 'opal/lib/opal/simple_server.rb', line 28

def index_path
  @index_path
end

#mainObject

Returns the value of attribute main.


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# File 'opal/lib/opal/simple_server.rb', line 28

def main
  @main
end

Instance Method Details

#append_path(path) ⇒ Object

Deprecated.

It's here for compatibility with Opal::Sprockets::Server


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# File 'opal/lib/opal/simple_server.rb', line 32

def append_path(path)
  Opal.deprecation "`#{self.class}#append_path` is deprecated, please use `Opal.append_path(path)` instead (called from: #{caller(1, 1).first})"
  Opal.append_path path
end

#cache_invalidatorObject


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# File 'opal/lib/opal/simple_server.rb', line 71

def cache_invalidator
  "?#{Time.now.to_i}"
end

#call(env) ⇒ Object


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# File 'opal/lib/opal/simple_server.rb', line 37

def call(env)
  case env['PATH_INFO']
  when %r{\A/#{@prefix}/(.*)\.js\z}
    path, _cache_invalidator = Regexp.last_match(1).split('?', 2)
    call_js(path)
  else call_index
  end
rescue NotFound => error
  [404, {}, [error.to_s]]
end

#call_indexObject


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# File 'opal/lib/opal/simple_server.rb', line 75

def call_index
  if @index_path
    contents = File.read(@index_path)
    html = ERB.new(contents).result binding
  else
    html = <<-HTML
    <!doctype html>
    <html>
      <head>
        <meta charset="utf8">
        #{javascript_include_tag(main)}
      </head>
      <body></body>
    </html>
    HTML
  end
  [200, { 'Content-Type' => 'text/html' }, [html]]
end

#call_js(path) ⇒ Object


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# File 'opal/lib/opal/simple_server.rb', line 48

def call_js(path)
  asset = fetch_asset(path)
  [
    200,
    { 'Content-Type' => 'application/javascript' },
    [asset[:data], "\n", asset[:map].to_data_uri_comment],
  ]
end

#fetch_asset(path) ⇒ Object


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# File 'opal/lib/opal/simple_server.rb', line 57

def fetch_asset(path)
  builder = Opal::Builder.new
  builder.build(path.gsub(/(\.(?:rb|js|opal))*\z/, ''))
  {
    data: builder.to_s,
    map: builder.source_map,
    source: builder.source_for(path),
  }
end

#javascript_include_tag(path) ⇒ Object


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# File 'opal/lib/opal/simple_server.rb', line 67

def javascript_include_tag(path)
  %{<script src="/#{@prefix}/#{path}.js#{cache_invalidator}"></script>}
end