Class: Blazer::DataSource

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/blazer/data_source.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, settings) ⇒ DataSource

Returns a new instance of DataSource.



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# File 'lib/blazer/data_source.rb', line 11

def initialize(id, settings)
  @id = id
  @settings = settings

  unless settings["url"] || Rails.env.development?
    raise Blazer::Error, "Empty url for data source: #{id}"
  end

  @adapter_instance =
    case adapter
    when "elasticsearch"
      Blazer::Adapters::ElasticsearchAdapter.new(self)
    when "mongodb"
      Blazer::Adapters::MongodbAdapter.new(self)
    when "presto"
      Blazer::Adapters::PrestoAdapter.new(self)
    when "sql"
      Blazer::Adapters::SqlAdapter.new(self)
    else
      raise Blazer::Error, "Unknown adapter"
    end
end

Instance Attribute Details

#adapter ⇒ Object (readonly)

Returns the value of attribute adapter.



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

def adapter
  @adapter
end

#adapter_instance ⇒ Object (readonly)

Returns the value of attribute adapter_instance.



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

def adapter_instance
  @adapter_instance
end

#id ⇒ Object (readonly)

Returns the value of attribute id.



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

def id
  @id
end

#settings ⇒ Object (readonly)

Returns the value of attribute settings.



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

def settings
  @settings
end

Instance Method Details

#cache ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 62

def cache
  @cache ||= begin
    if settings["cache"].is_a?(Hash)
      settings["cache"]
    elsif settings["cache"]
      {
        "mode" => "all",
        "expires_in" => settings["cache"]
      }
    else
      {
        "mode" => "off"
      }
    end
  end
end

#cache_expires_in ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 83

def cache_expires_in
  (cache["expires_in"] || 60).to_f
end

#cache_key(key) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 150

def cache_key(key)
  (["blazer", "v4"] + key).join("/")
end

#cache_mode ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 79

def cache_mode
  cache["mode"]
end

#cache_slow_threshold ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 87

def cache_slow_threshold
  (cache["slow_threshold"] || 15).to_f
end

#clear_cache(statement) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 146

def clear_cache(statement)
  Blazer.cache.delete(statement_cache_key(statement))
end

#delete_results(run_id) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 106

def delete_results(run_id)
  Blazer.cache.delete(run_cache_key(run_id))
end

#linked_columns ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 42

def linked_columns
  settings["linked_columns"] || {}
end

#local_time_suffix ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 91

def local_time_suffix
  @local_time_suffix ||= Array(settings["local_time_suffix"])
end

#name ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 38

def name
  settings["name"] || @id
end

#read_cache(cache_key) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 95

def read_cache(cache_key)
  value = Blazer.cache.read(cache_key)
  if value
    Blazer::Result.new(self, *Marshal.load(value), nil)
  end
end

#run_cache_key(run_id) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 158

def run_cache_key(run_id)
  cache_key(["run", run_id])
end

#run_results(run_id) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 102

def run_results(run_id)
  read_cache(run_cache_key(run_id))
end

#run_statement(statement, options = {}) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 110

def run_statement(statement, options = {})
  run_id = options[:run_id]
  async = options[:async]
  result = nil
  if cache_mode != "off"
    if options[:refresh_cache]
      clear_cache(statement) # for checks
    else
      result = read_cache(statement_cache_key(statement))
    end
  end

  unless result
    comment = "blazer"
    if options[:user].respond_to?(:id)
      comment << ",user_id:#{options[:user].id}"
    end
    if options[:user].respond_to?(Blazer.user_name)
      # only include letters, numbers, and spaces to prevent injection
      comment << ",user_name:#{options[:user].send(Blazer.user_name).to_s.gsub(/[^a-zA-Z0-9 ]/, "")}"
    end
    if options[:query].respond_to?(:id)
      comment << ",query_id:#{options[:query].id}"
    end
    if options[:check]
      comment << ",check_id:#{options[:check].id},check_emails:#{options[:check].emails}"
    end
    if options[:run_id]
      comment << ",run_id:#{options[:run_id]}"
    end
    result = run_statement_helper(statement, comment, async ? options[:run_id] : nil)
  end

  result
end

#smart_columns ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 46

def smart_columns
  settings["smart_columns"] || {}
end

#smart_variables ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 50

def smart_variables
  settings["smart_variables"] || {}
end

#statement_cache_key(statement) ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 154

def statement_cache_key(statement)
  cache_key(["statement", id, Digest::MD5.hexdigest(statement.to_s.gsub("\r\n", "\n"))])
end

#timeout ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 58

def timeout
  settings["timeout"]
end

#variable_defaults ⇒ Object 



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# File 'lib/blazer/data_source.rb', line 54

def variable_defaults
  settings["variable_defaults"] || {}
end