Class: Ej::Core

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

Instance Method Summary collapse

Constructor Details

#initialize(values) ⇒ Core

Returns a new instance of Core.



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# File 'lib/ej/core.rb', line 13

def initialize(values)
  @logger =  values.logger
  @index = values.index
  @client = values.client
end

Instance Method Details

#aggs(terms, size, query) ⇒ Object 



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# File 'lib/ej/core.rb', line 81

def aggs(terms, size, query)
  body = {
    "size"=>0,
    "query"=>{
      "query_string"=>{
        "query"=>query
      }
    }
  }

  agg_terms = []
  code = %Q{['aggs']}
  terms.each_with_index do |term, i|
    term_name = "agg_#{term}"
    aggs_body = {
      term_name=>{
        "terms"=>{
          "field"=>term,
          "size"=>size,
          "order"=>{
            "_count"=>"desc"
          }
        }
      }
    }

    eval(%Q{body#{code} = aggs_body})
    code += %Q{['#{term_name}']['aggs']}
  end

  @client.search index: @index, body: body
end

#bulk(timestamp_key, type, add_timestamp, id_keys, index, data) ⇒ Object 



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# File 'lib/ej/core.rb', line 132

def bulk(timestamp_key, type, add_timestamp, id_keys, index, data)
  template = id_keys.map { |key| '%s' }.join('_') unless id_keys.nil?
  bulk_message = []
  data.each do |record|
    if timestamp_key.nil?
      timestamp = Time.now.to_datetime.to_s
    else
      timestamp = record[timestamp_key].to_time.to_datetime.to_s
    end
    record.merge!('@timestamp' => timestamp) if add_timestamp
    meta = { index: { _index: index, _type: type } }
    meta[:index][:_id] = Util.generate_id(template, record, id_keys) unless id_keys.nil?
    bulk_message << meta
    bulk_message << record
  end
  connect_with_retry { @client.bulk body: bulk_message unless bulk_message.empty? }
end

#copy(source, dest, query, per_size, scroll) ⇒ Object 



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# File 'lib/ej/core.rb', line 150

def copy(source, dest, query, per_size, scroll)
  source_client = Elasticsearch::Client.new hosts: source
  dest_client = Elasticsearch::Client.new hosts: dest

  scroll_option = get_scroll_option(@index, query, per_size, scroll)
  r = connect_with_retry { source_client.search(scroll_option) }
  total = r['hits']['total']
  i = 0
  i += bulk_results(r, dest_client, i, total)

  while r = connect_with_retry { source_client.scroll(scroll_id: r['_scroll_id'], scroll: scroll) } and
    (not r['hits']['hits'].empty?) do
    i += bulk_results(r, dest_client, i, total)
  end
end

#distinct(term, type, query) ⇒ Object 



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# File 'lib/ej/core.rb', line 37

def distinct(term, type, query)
  body = { size: 0, "aggs"=>{ term + "_count"=>{"cardinality"=>{"field"=>term}}}}
  body[:query] = { query_string: { query: query } } unless query.nil?
  @client.search index: @index, type: type, body: body
end

#dump(query, per_size) ⇒ Object 



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# File 'lib/ej/core.rb', line 43

def dump(query, per_size)
  per = per_size || DEFAULT_PER
  num = 0
  while true
    bulk_message = []
    from = num * per
    body = { size: per, from: from }
    body[:query] = { query_string: { query: query } } unless query.nil?
    data = HashWrapper.new(@client.search index: @index, body: body)
    docs = data.hits.hits
    break if docs.empty?
    docs.each do |doc|
      source = doc.delete('_source')
      doc.delete('_score')
      bulk_message << Yajl::Encoder.encode({ 'index' => doc.to_h })
      bulk_message << Yajl::Encoder.encode(source)
    end
    num += 1
    puts bulk_message.join("\n")
  end
end

#facet(term, size, query) ⇒ Object 



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# File 'lib/ej/core.rb', line 65

def facet(term, size, query)
  body = {"facets"=>
    {"terms"=>
      {"terms"=>{"field"=>term, "size"=>size, "order"=>"count", "exclude"=>[]},
       "facet_filter"=>
        {"fquery"=>
          {"query"=>
            {"filtered"=>
              {"query"=>
                {"bool"=>
                  {"should"=>[{"query_string"=>{"query"=>query}}]}},
               "filter"=>{"bool"=>{"must"=>[{"match_all"=>{}}]}}}}}}}},
   "size"=>0}
  @client.search index: @index, body: body
end

#max(term) ⇒ Object 



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# File 'lib/ej/core.rb', line 123

def max(term)
  body = {
    aggs: {
      "max_#{term}" => { max: { field: term } }
    }
  }
  @client.search index: @index, body: body, size: 0
end

#min(term) ⇒ Object 



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# File 'lib/ej/core.rb', line 114

def min(term)
  body = {
    aggs: {
      "min_#{term}" => { min: { field: term } }
    }
  }
  @client.search index: @index, body: body, size: 0
end

#search(type, query, size, from, meta, routing = nil, fields = nil, sort = nil) ⇒ Object 



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# File 'lib/ej/core.rb', line 19

def search(type, query, size, from, meta, routing = nil, fields = nil, sort = nil)
  body = { from: from }
  body[:size] = size unless size.nil?
  if sort
    sorts = []
    sort.each do |k, v|
      sorts << { k => v }
    end
    body[:sort] = sorts
  end
  body[:query] = { query_string: { query: query } } unless query.nil?
  search_option = { index: @index, type: type, body: body }
  search_option[:routing] = routing unless routing.nil?
  search_option[:_source] = fields.nil? ? nil : fields.join(',')
  results = HashWrapper.new(@client.search(search_option))
  meta ? results : Util.get_sources(results)
end