Class: JSONHome

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

Constant Summary collapse

DEFAULT_NAMESPACE = 
'http://helloworld.innoq.com'

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_uri, local_resources = nil) ⇒ JSONHome

Returns a new instance of JSONHome.



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# File 'lib/json_home.rb', line 29

def initialize(base_uri, local_resources = nil)
  @base_uri  = URI.parse(base_uri)
  @resources = {}
  reload(local_resources)
end

Class Attribute Details

.default_namespace ⇒ Object

Returns the value of attribute default_namespace.



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# File 'lib/json_home.rb', line 25

def default_namespace
  @default_namespace
end

.ignore_http_errors ⇒ Object

Returns the value of attribute ignore_http_errors.



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# File 'lib/json_home.rb', line 25

def ignore_http_errors
  @ignore_http_errors
end

.logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/json_home.rb', line 25

def logger
  @logger
end

.use_additional_params ⇒ Object

Returns the value of attribute use_additional_params.



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# File 'lib/json_home.rb', line 25

def use_additional_params
  @use_additional_params
end

Instance Attribute Details

#base_uri ⇒ Object (readonly)

Returns the value of attribute base_uri.



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# File 'lib/json_home.rb', line 20

def base_uri
  @base_uri
end

Class Method Details

.uri(resources, resource, params = {}) ⇒ Object 



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# File 'lib/json_home.rb', line 72

def self.uri(resources, resource, params = {})
  resource = with_namespace(resource)
  unless uri?(resources, resource)
    self.warn "Couldn't find valid JSON home data for '#{resource}'"
    return nil
  end

  params = params.inject({}) { |h, (k, v)| h.merge(k.to_s => v)  }
  data   = resources[resource.to_s]

  if data['href'].is_a?(String)
    uri = data['href']
    unknown_keys = params.keys
  elsif data['href-template'].is_a?(String)
    uri = data['href-template']
    unknown_keys = (params.keys - data['href-vars'].keys)
    self.warn "Unknown keys #{unknown_keys.inspect} in ForeignLinks#uri call" if unknown_keys.any?
    data['href-vars'].each do |key, type_uri|
      self.warn("Missing key '#{key}' in ForeignLinks#uri call (rel=#{resource})") unless params[key]
      uri = uri.gsub("{#{key}}", params[key].to_s)
    end
  end

  if self.use_additional_params and unknown_keys.any?
    additional_params = URI.encode_www_form params.select{|k, v| unknown_keys.include? k }
    if uri.include? '?'
      uri + '&' + additional_params
    else
      uri + '?' + additional_params
    end
  else
    uri
  end
end

.uri?(resources, resource) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/json_home.rb', line 107

def self.uri?(resources, resource)
  data = resources[self.with_namespace(resource)]
  data.is_a?(Hash) && (
    data['href'].is_a?(String) ||
        (data['href-template'].is_a?(String) && data['href-vars'].is_a?(Hash))
  )
end

Instance Method Details

#reload(local_resources = nil) ⇒ Object 



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# File 'lib/json_home.rb', line 35

def reload(local_resources = nil)
  Net::HTTP.start(@base_uri.host, @base_uri.port, :use_ssl => @base_uri.scheme == 'https') do |http|
    req = if local_resources.is_a?(Hash)
      r = Net::HTTP::Put.new(@base_uri.request_uri)
      r.body = JSON.generate('resources' => with_namespaces(local_resources))
      r['Content-Type'] = 'application/json'
      r
    else
      Net::HTTP::Get.new(@base_uri.request_uri)
    end
    req['Accept'] = 'application/json-home'
    res = http.request(req)
    if res.is_a?(Net::HTTPSuccess)
      @resources = JSON.parse(res.body)['resources'] || {}
      self.class.logger.debug("Found ForeignLinks: #{@resources.keys.inspect}") if self.class.logger
    else
      raise RuntimeError.new("HTTP error: '#{res.code} #{res.message}'")
    end
  end
rescue Net::HTTPExceptions, Errno::ECONNREFUSED, RuntimeError => e
  if self.class.ignore_http_errors
    puts e
    self.class.logger.error(e) if self.class.logger
    @resources = with_namespaces(local_resources || {})
  else
    raise e
  end
end

#uri(resource, params = {}) ⇒ Object 



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# File 'lib/json_home.rb', line 64

def uri(resource, params = {})
  self.class.uri(@resources, resource, params)
end

#uri?(resource) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/json_home.rb', line 68

def uri?(resource)
  self.class.uri?(@resources, resource)
end