Class: Staticd::HTTPCache

Inherits:
Object
  • Object
show all
Includes:
Models
Defined in:
lib/staticd/http_cache.rb

Overview

Rack middleware to manage remote HTTP resources caching.

For each request, it will find the last release of the site associed with the requested domain name and cache the corresponding resource if not already cached.

Instance Method Summary collapse

Constructor Details

#initialize(http_root, app) ⇒ HTTPCache

Returns a new instance of HTTPCache.



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# File 'lib/staticd/http_cache.rb', line 14

def initialize(http_root, app)
  @app = app
  @http_root = http_root

  raise "No HTTP root folder provided" unless @http_root
  raise "No rack app provided" unless @app
end

Instance Method Details

#_call(env) ⇒ Object 



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# File 'lib/staticd/http_cache.rb', line 26

def _call(env)
  @env = env

  # Change the Request Path to '/index.html' if root path is asked.
  @env["PATH_INFO"] = "/index.html" if @env["PATH_INFO"] == '/'

  # Get the release from the request Host header.
  release = Release.last(
    Release.site.domain_names.name => Rack::Request.new(@env).host
  )
  return next_middleware unless release

  # Change the script name to include the site name and release version.
  @env["SCRIPT_NAME"] = "/#{release.site_name}/#{release}"

  req = Rack::Request.new(@env)
  cache_engine = CacheEngine.new(@http_root)

  # Do nothing else if the resource is already cached.
  return next_middleware if cache_engine.cached?(req.path)

  # Get the resource to cache.
  resource = Resource.first(
    Resource.routes.release_id => release.id,
    Resource.routes.path => req.path_info
  )
  return next_middleware unless resource

  # Cache the resource.
  cache_engine.cache(req.path, resource.url)
  next_middleware
end

#call(env) ⇒ Object 



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# File 'lib/staticd/http_cache.rb', line 22

def call(env)
  dup._call(env)
end