Class: DynamoDB::Driver

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/ddbcli/ddb-driver.rb

Defined Under Namespace

Classes: Rownum

Constant Summary collapse

MAX_NUMBER_BATCH_PROCESS_ITEMS = 
25

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(accessKeyId, secretAccessKey, endpoint_or_region) ⇒ Driver

Rownum



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# File 'lib/ddbcli/ddb-driver.rb', line 24

def initialize(accessKeyId, secretAccessKey, endpoint_or_region)
  @client = DynamoDB::Client.new(accessKeyId, secretAccessKey, endpoint_or_region)
  @consistent = false
  @iteratable = false
end

Instance Attribute Details

#consistent ⇒ Object

Returns the value of attribute consistent.



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# File 'lib/ddbcli/ddb-driver.rb', line 40

def consistent
  @consistent
end

#iteratable ⇒ Object

Returns the value of attribute iteratable.



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# File 'lib/ddbcli/ddb-driver.rb', line 41

def iteratable
  @iteratable
end

Instance Method Details

#execute(query, opts = {}) ⇒ Object 



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# File 'lib/ddbcli/ddb-driver.rb', line 43

def execute(query, opts = {})
  parsed, script_type, script = Parser.parse(query)
  command = parsed.class.name.split('::').last.to_sym

  if command != :NEXT
    @last_action = nil
    @last_parsed = nil
    @last_evaluated_key = nil
  end

  retval = case command
           when :SHOW_TABLES
             do_show_tables(parsed)
           when :SHOW_TABLE_STATUS
             do_show_table_status(parsed)
           when :SHOW_REGIONS
             do_show_regions(parsed)
           when :SHOW_CREATE_TABLE
             do_show_create_table(parsed)
           when :ALTER_TABLE
             do_alter_table(parsed)
           when :ALTER_TABLE_INDEX
             do_alter_table_index(parsed)
           when :USE
             do_use(parsed)
           when :CREATE
             do_create(parsed)
           when :CREATE_LIKE
             do_create_like(parsed)
           when :DROP
             do_drop(parsed)
           when :DESCRIBE
             do_describe(parsed)
           when :SELECT
             do_select('Query', parsed)
           when :SCAN
             do_select('Scan', parsed)
           when :GET
             do_get(parsed)
           when :UPDATE
             do_update(parsed)
           when :UPDATE_ALL
             do_update_all(parsed)
           when :DELETE
             do_delete(parsed)
           when :DELETE_ALL
             do_delete_all(parsed)
           when :INSERT
             do_insert(parsed)
           when :INSERT_SELECT
             do_insert_select('Query', parsed)
           when :INSERT_SCAN
             do_insert_select('Scan', parsed)
           when :NEXT
             if @last_action and @last_parsed and @last_evaluated_key
               do_select(@last_action, @last_parsed, :last_evaluated_key => @last_evaluated_key)
             else
               []
             end
           when :NULL
             nil
           else
             raise 'must not happen'
           end

  begin
    case script_type
    when :ruby
      retval = retval.data if retval.kind_of?(DynamoDB::Iteratorable)
      retval.instance_eval(script)
    when :shell
      retval = retval.data if retval.kind_of?(DynamoDB::Iteratorable)
      IO.popen(script, "r+") do |f|
        f.puts(retval.kind_of?(Array) ? retval.map {|i| i.to_s }.join("\n") : retval.to_s)
        f.close_write
        f.read
      end
    when :overwrite
      open(script, 'wb') {|f| print_json(retval, f, opts.merge(:show_rows => false, :strip => true)) }
      retval = nil
    when :append
      open(script, 'ab') {|f| print_json(retval, f, opts.merge(:show_rows => false, :strip => true)) }
      retval = nil
    else
      retval
    end
  rescue Exception => e
    raise DynamoDB::Error, e.message, e.backtrace
  end
end

#import(table, items) ⇒ Object 



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# File 'lib/ddbcli/ddb-driver.rb', line 134

def import(table, items)
  n = 0

  until (chunk = items.slice!(0, MAX_NUMBER_BATCH_PROCESS_ITEMS)).empty?
    operations = []

    req_hash = {
      'RequestItems' => {
        table => operations,
      },
    }

    chunk.each do |item|
      h = {}

      operations << {
        'PutRequest' => {
          'Item' => h,
        },
      }

      item.each do |name, val|
        h[name] = convert_to_attribute_value(val)
      end
    end

    batch_write_item(req_hash)
    n += chunk.length
  end

  return n
end