Class: Druid::DataSource

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

Defined Under Namespace

Classes: Error

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, uri) ⇒ DataSource

Returns a new instance of DataSource.



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# File 'lib/druid/data_source.rb', line 9

def initialize(name, uri)
  @name = name.split('/').last
  uri = uri.sample if uri.is_a?(Array)
  if uri.is_a?(String)
    @uri = URI(uri)
  else
    @uri = uri
  end
end

Instance Attribute Details

#dimensions ⇒ Object (readonly)

Returns the value of attribute dimensions.



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# File 'lib/druid/data_source.rb', line 7

def dimensions
  @dimensions
end

#metrics ⇒ Object (readonly)

Returns the value of attribute metrics.



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# File 'lib/druid/data_source.rb', line 7

def metrics
  @metrics
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/druid/data_source.rb', line 7

def name
  @name
end

#uri ⇒ Object (readonly)

Returns the value of attribute uri.



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# File 'lib/druid/data_source.rb', line 7

def uri
  @uri
end

Instance Method Details

#metadata ⇒ Object 



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# File 'lib/druid/data_source.rb', line 19

def metadata
  @metadata ||= metadata!
end

#metadata!(opts = {}) ⇒ Object 



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# File 'lib/druid/data_source.rb', line 23

def metadata!(opts = {})
  meta_path = "#{@uri.path}datasources/#{name}"

  if opts[:interval]
    from, to = opts[:interval]
    from = from.respond_to?(:iso8601) ? from.iso8601 : ISO8601::DateTime.new(from).to_s
    to = to.respond_to?(:iso8601) ? to.iso8601 : ISO8601::DateTime.new(to).to_s

    meta_path += "?interval=#{from}/#{to}"
  end

  req = Net::HTTP::Get.new(meta_path)
  response = Net::HTTP.new(uri.host, uri.port).start do |http|
    http.open_timeout = 10 # if druid is down fail fast
    http.read_timeout = nil # we wait until druid is finished
    http.request(req)
  end

  if response.code != '200'
    raise "Request failed: #{response.code}: #{response.body}"
  end

  MultiJson.load(response.body)
end

#post(query) ⇒ Object 



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# File 'lib/druid/data_source.rb', line 56

def post(query)
  query = query.query if query.is_a?(Druid::Query::Builder)
  query = Query.new(MultiJson.load(query)) if query.is_a?(String)
  query.dataSource = name

  req = Net::HTTP::Post.new(uri.path, { 'Content-Type' => 'application/json' })
  query_as_json = query.as_json
  req.body = MultiJson.dump(query_as_json)


  response = ActiveSupport::Notifications.instrument('post.druid', data_source: name, query: query_as_json) do
    Net::HTTP.new(uri.host, uri.port).start do |http|
      http.open_timeout = 10 # if druid is down fail fast
      http.read_timeout = nil # we wait until druid is finished
      http.request(req)
    end
  end

  if response.code != '200'
    # ignore GroupBy cache issues and try again without cached results
    if query.context.useCache != false && response.code == "500" && response.body =~ /Cannot have a null result!/
      query.context.useCache = false
      return self.post(query)
    end

    raise Error.new(response)
  end

  MultiJson.load(response.body)
end