Class: FakeDynamo::DB

Inherits:
Object
  • Object
show all
Includes:
Validation
Defined in:
lib/fake_dynamo/db.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Validation

#add_errors, #api_config, #api_config_path, #api_input_spec, #available_operations, #param, #validate!, #validate_input, #validate_key_data, #validate_key_schema, #validate_operation, #validate_payload, #validate_request_size, #validate_spec, #validate_type

Constructor Details

#initialize ⇒ DB

Returns a new instance of DB.



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# File 'lib/fake_dynamo/db.rb', line 14

def initialize
  @tables = {}
end

Instance Attribute Details

#tables ⇒ Object

Returns the value of attribute tables.



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# File 'lib/fake_dynamo/db.rb', line 6

def tables
  @tables
end

Class Method Details

.delegate_to_table(*methods) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 80

def self.delegate_to_table(*methods)
  methods.each do |method|
    define_method(method) do |data|
      find_table(data['TableName']).send(method, data)
    end
  end
end

.instance ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 9

def instance
  @db ||= DB.new
end

Instance Method Details

#batch_get_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 91

def batch_get_item(data)
  response = {}

  data['RequestItems'].each do |table_name, table_data|
    table = find_table(table_name)

    unless response[table_name]
      response[table_name] = { 'ConsumedCapacityUnits' => 1, 'Items' => [] }
    end

    table_data['Keys'].each do |key|
      if item_hash = table.get_raw_item(key, table_data['AttributesToGet'])
        response[table_name]['Items'] << item_hash
      end
    end
  end

  { 'Responses' => response, 'UnprocessedKeys' => {}}
end

#batch_write_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 111

def batch_write_item(data)
  response = {}
  items = {}
  request_count = 0

  # validation
  data['RequestItems'].each do |table_name, requests|
    table = find_table(table_name)

    items[table.name] ||= {}

    requests.each do |request|
      if request['PutRequest']
        item = table.batch_put_request(request['PutRequest'])
        check_item_conflict(items, table.name, item.key)
        items[table.name][item.key] = item
      else
        key = table.batch_delete_request(request['DeleteRequest'])
        check_item_conflict(items, table.name, key)
        items[table.name][key] = :delete
      end

      request_count += 1
    end
  end

  check_max_request(request_count)

  # real modification
  items.each do |table_name, requests|
    table = find_table(table_name)
    requests.each do |key, value|
      if value == :delete
        table.batch_delete(key)
      else
        table.batch_put(value)
      end
    end
    response[table_name] = { 'ConsumedCapacityUnits' => 1 }
  end

  { 'Responses' => response, 'UnprocessedItems' => {} }
end

#create_table(data) ⇒ Object

Raises:



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# File 'lib/fake_dynamo/db.rb', line 28

def create_table(data)
  table_name = data['TableName']
  raise ResourceInUseException, "Duplicate table name: #{table_name}" if tables[table_name]

  table = Table.new(data)
  tables[table_name] = table
  response = table.description
  table.activate
  response
end

#delete_table(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 44

def delete_table(data)
  table_name = data['TableName']
  table = find_table(table_name)
  tables.delete(table_name)
  table.delete
end

#describe_table(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 39

def describe_table(data)
  table = find_table(data['TableName'])
  table.describe_table
end

#list_tables(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 51

def list_tables(data)
  start_table = data['ExclusiveStartTableName']
  limit = data['Limit']

  all_tables = tables.keys
  start = 0

  if start_table
    if i = all_tables.index(start_table)
      start = i + 1
    end
  end

  limit ||= all_tables.size
  result_tables = all_tables[start, limit]
  response = { 'TableNames' => result_tables }

  if (start + limit ) < all_tables.size
    last_table = all_tables[start + limit -1]
    response.merge!({ 'LastEvaluatedTableName' => last_table })
  end
  response
end

#process(operation, data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 22

def process(operation, data)
  validate_payload(operation, data)
  operation = operation.underscore
  self.send operation, data
end

#reset ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 18

def reset
  @tables = {}
end

#update_table(data) ⇒ Object 



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# File 'lib/fake_dynamo/db.rb', line 75

def update_table(data)
  table = find_table(data['TableName'])
  table.update(data['ProvisionedThroughput']['ReadCapacityUnits'], data['ProvisionedThroughput']['WriteCapacityUnits'])
end