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Class: Opal::SimpleServer

Inherits:
Object
  • Object
  • Opal::SimpleServer
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

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_path ⇒ Object

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

#main ⇒ Object

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_invalidator ⇒ Object 

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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_index ⇒ Object 

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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

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