Class: Blazer::Adapters::ElasticsearchAdapter

Inherits:
BaseAdapter
  • Object
show all
Defined in:
lib/blazer/adapters/elasticsearch_adapter.rb

Instance Attribute Summary

Attributes inherited from BaseAdapter

#data_source

Instance Method Summary collapse

Methods inherited from BaseAdapter

#cachable?, #cancel, #cohort_analysis_statement, #cost, #explain, #initialize, #reconnect, #schema, #supports_cohort_analysis?

Constructor Details

This class inherits a constructor from Blazer::Adapters::BaseAdapter

Instance Method Details

#parameter_binding ⇒ Object

www.elastic.co/guide/en/elasticsearch/reference/current/sql-rest-params.html



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# File 'lib/blazer/adapters/elasticsearch_adapter.rb', line 46

def parameter_binding
  :positional
end

#preview_statement ⇒ Object 



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# File 'lib/blazer/adapters/elasticsearch_adapter.rb', line 36

def preview_statement
  "SELECT * FROM \"{table}\" LIMIT 10"
end

#quoting ⇒ Object

www.elastic.co/guide/en/elasticsearch/reference/current/sql-lexical-structure.html#sql-syntax-string-literals



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# File 'lib/blazer/adapters/elasticsearch_adapter.rb', line 41

def quoting
  :single_quote_escape
end

#run_statement(statement, comment, bind_params) ⇒ Object 



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# File 'lib/blazer/adapters/elasticsearch_adapter.rb', line 4

def run_statement(statement, comment, bind_params)
  columns = []
  rows = []
  error = nil

  begin
    response = client.transport.perform_request("POST", endpoint, {}, {query: "#{statement} /*#{comment}*/", params: bind_params}).body
    columns = response["columns"].map { |v| v["name"] }
    # Elasticsearch does not differentiate between dates and times
    date_indexes = response["columns"].each_index.select { |i| ["date", "datetime"].include?(response["columns"][i]["type"]) }
    if columns.any?
      rows = response["rows"]
      date_indexes.each do |i|
        rows.each do |row|
          row[i] &&= Time.parse(row[i])
        end
      end
    end
  rescue => e
    error = e.message
    error = Blazer::VARIABLE_MESSAGE if error.include?("mismatched input '?'")
  end

  [columns, rows, error]
end

#tables ⇒ Object 



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# File 'lib/blazer/adapters/elasticsearch_adapter.rb', line 30

def tables
  indices = client.cat.indices(format: "json").map { |v| v["index"] }
  aliases = client.cat.aliases(format: "json").map { |v| v["alias"] }
  (indices + aliases).uniq.sort
end