Class: FakeDynamo::Table

Inherits:
Object
  • Object
show all
Includes:
Filter, Validation
Defined in:
lib/fake_dynamo/table.rb

Constant Summary

Constants included from Filter

Filter::INF

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Filter

#comparison_filter, #contains_filter, def_filter, #in_filter, #not_contains_filter, #not_null_filter, #null_filter, #validate_size, #validate_supported_types

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(data) ⇒ Table

Returns a new instance of Table.



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# File 'lib/fake_dynamo/table.rb', line 10

def initialize(data)
  extract_values(data)
  init
end

Instance Attribute Details

#creation_date_time ⇒ Object

Returns the value of attribute creation_date_time.



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

def creation_date_time
  @creation_date_time
end

#items ⇒ Object

Returns the value of attribute items.



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

def items
  @items
end

#key_schema ⇒ Object

Returns the value of attribute key_schema.



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

def key_schema
  @key_schema
end

#last_decreased_time ⇒ Object

Returns the value of attribute last_decreased_time.



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

def last_decreased_time
  @last_decreased_time
end

#last_increased_time ⇒ Object

Returns the value of attribute last_increased_time.



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

def last_increased_time
  @last_increased_time
end

#name ⇒ Object

Returns the value of attribute name.



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

def name
  @name
end

#read_capacity_units ⇒ Object

Returns the value of attribute read_capacity_units.



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

def read_capacity_units
  @read_capacity_units
end

#size_bytes ⇒ Object

Returns the value of attribute size_bytes.



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

def size_bytes
  @size_bytes
end

#status ⇒ Object

Returns the value of attribute status.



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

def status
  @status
end

#write_capacity_units ⇒ Object

Returns the value of attribute write_capacity_units.



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

def write_capacity_units
  @write_capacity_units
end

Instance Method Details

#activate ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 57

def activate
  @status = 'ACTIVE'
end

#batch_delete(key) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 152

def batch_delete(key)
  @items.delete(key)
end

#batch_delete_request(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 148

def batch_delete_request(data)
  Key.from_data(data['Key'], key_schema)
end

#batch_put(item) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 108

def batch_put(item)
  @items[item.key] = item
end

#batch_put_request(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 104

def batch_put_request(data)
  Item.from_data(data['Item'], key_schema)
end

#check_conditions(old_item, conditions) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 366

def check_conditions(old_item, conditions)
  return unless conditions

  conditions.each do |name, predicate|
    exist = predicate['Exists']
    value = predicate['Value']

    if not value
      if exist.nil?
        raise ValidationException, "'Exists' is set to null. 'Exists' must be set to false when no Attribute value is specified"
      elsif exist
        raise ValidationException, "'Exists' is set to true. 'Exists' must be set to false when no Attribute value is specified"
      elsif !exist # false
        if old_item and old_item[name]
          raise ConditionalCheckFailedException
        end
      end
    else
      expected_attr = Attribute.from_hash(name, value)

      if exist.nil? or exist
        raise ConditionalCheckFailedException unless (old_item and old_item[name] == expected_attr)
      elsif !exist # false
        raise ValidationException, "Cannot expect an attribute to have a specified value while expecting it to not exist"
      end
    end
  end
end

#consumed_capacity ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 362

def consumed_capacity
  { 'ConsumedCapacityUnits' => 1 }
end

#count_and_attributes_to_get_present?(data) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fake_dynamo/table.rb', line 250

def count_and_attributes_to_get_present?(data)
  if data['Count'] and data['AttributesToGet']
    raise ValidationException, "Cannot specify the AttributesToGet when choosing to get only the Count"
  end
end

#create_item?(data) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fake_dynamo/table.rb', line 318

def create_item?(data)
  data['AttributeUpdates'].any? do |name, update_data|
    action = update_data['Action']
    ['PUT', 'ADD', nil].include? action
  end
end

#create_table_data ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 30

def create_table_data
  {
    'TableName' => name,
    'KeySchema' => key_schema.description,
    'ProvisionedThroughput' => {
      'ReadCapacityUnits' => read_capacity_units,
      'WriteCapacityUnits' => write_capacity_units
    }
  }
end

#deep_copy(x) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 188

def deep_copy(x)
  Marshal.load(Marshal.dump(x))
end

#delete ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 61

def delete
  @status = 'DELETING'
  description
end

#delete_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 139

def delete_item(data)
  key = Key.from_data(data['Key'], key_schema)
  item = @items[key]
  check_conditions(item, data['Expected'])

  @items.delete(key) if item
  consumed_capacity.merge(return_values(data, item))
end

#describe_table ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 53

def describe_table
  { 'Table' => description['TableDescription'] }.merge(size_description)
end

#description ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 15

def description
  {
    'TableDescription' => {
      'CreationDateTime' => creation_date_time,
      'KeySchema' => key_schema.description,
      'ProvisionedThroughput' => {
        'ReadCapacityUnits' => read_capacity_units,
        'WriteCapacityUnits' => write_capacity_units
      },
      'TableName' => name,
      'TableStatus' => status
    }
  }
end

#drop_till_start(all_items, start_key_hash, forward) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 262

def drop_till_start(all_items, start_key_hash, forward)
  all_items = all_items.sort_by { |item| item.key }

  unless forward
    all_items = all_items.reverse
  end

  if start_key_hash
    start_key = Key.from_data(start_key_hash, key_schema)
    all_items.drop_while do |item|
      if forward
        item.key <= start_key
      else
        item.key >= start_key
      end
    end
  else
    all_items
  end
end

#filter(items, conditions, limit, fail_on_type_mismatch) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 283

def filter(items, conditions, limit, fail_on_type_mismatch)
  limit ||= -1
  result = []
  last_evaluated_item = nil
  scaned_count = 0
  items.each do |item|
    select = true
    conditions.each do |attribute_name, condition|
      value = condition['AttributeValueList']
      comparison_op = condition['ComparisonOperator']
      unless self.send("#{comparison_op.downcase}_filter", value, item[attribute_name], fail_on_type_mismatch)
        select = false
        break
      end
    end

    if select
      result << item
      if (limit -= 1) == 0
        last_evaluated_item = item
        break
      end
    end

    scaned_count += 1
  end
  [result, last_evaluated_item, scaned_count]
end

#filter_attributes(item, attributes_to_get) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 129

def filter_attributes(item, attributes_to_get)
  hash = item.as_hash
  if attributes_to_get
    hash.select! do |attribute, value|
      attributes_to_get.include? attribute
    end
  end
  hash
end

#get_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 112

def get_item(data)
  response = consumed_capacity
  if item_hash = get_raw_item(data['Key'], data['AttributesToGet'])
    response.merge!('Item' => item_hash)
  end
  response
end

#get_items_by_hash_key(hash_key) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 312

def get_items_by_hash_key(hash_key)
  items.values.select do |i|
    i.key.primary == hash_key
  end
end

#get_raw_item(key_data, attributes_to_get) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 120

def get_raw_item(key_data, attributes_to_get)
  key = Key.from_data(key_data, key_schema)
  item = @items[key]

  if item
    filter_attributes(item, attributes_to_get)
  end
end

#put_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 95

def put_item(data)
  item = Item.from_data(data['Item'], key_schema)
  old_item = @items[item.key]
  check_conditions(old_item, data['Expected'])
  @items[item.key] = item

  consumed_capacity.merge(return_values(data, old_item))
end

#put_item_data(item) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 41

def put_item_data(item)
  {
    'TableName' => name,
    'Item' => item.as_hash
  }
end

#query(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 192

def query(data)
  unless key_schema.range_key
    raise ValidationException, "Query can be performed only on a table with a HASH,RANGE key schema"
  end

  count_and_attributes_to_get_present?(data)
  validate_limit(data)

  hash_attribute = Attribute.from_hash(key_schema.hash_key.name, data['HashKeyValue'])
  matched_items = get_items_by_hash_key(hash_attribute)

  forward = data.has_key?('ScanIndexForward') ? data['ScanIndexForward'] : true
  matched_items = drop_till_start(matched_items, data['ExclusiveStartKey'], forward)

  if data['RangeKeyCondition']
    conditions = {key_schema.range_key.name => data['RangeKeyCondition']}
  else
    conditions = {}
  end

  result, last_evaluated_item, _ = filter(matched_items, conditions, data['Limit'], true)

  response = {
    'Count' => result.size,
    'ConsumedCapacityUnits' => 1 }

  unless data['Count']
    response['Items'] = result.map { |r| filter_attributes(r, data['AttributesToGet']) }
  end

  if last_evaluated_item
    response['LastEvaluatedKey'] = last_evaluated_item.key.as_key_hash
  end
  response
end

#return_values(data, old_item, new_item = {}) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 329

def return_values(data, old_item, new_item={})
  old_item ||= {}
  old_hash = old_item.kind_of?(Item) ? old_item.as_hash : old_item

  new_item ||= {}
  new_hash = new_item.kind_of?(Item) ? new_item.as_hash : new_item


  return_value = data['ReturnValues']
  result = case return_value
           when 'ALL_OLD'
             old_hash
           when 'ALL_NEW'
             new_hash
           when 'UPDATED_OLD'
             updated = updated_attributes(data)
             old_hash.select { |name, _| updated.include? name }
           when 'UPDATED_NEW'
             updated = updated_attributes(data)
             new_hash.select { |name, _| updated.include? name }
           when 'NONE', nil
             {}
           else
             raise 'unknown return value'
           end

  unless result.empty?
    { 'Attributes' => result }
  else
    {}
  end
end

#scan(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 228

def scan(data)
  count_and_attributes_to_get_present?(data)
  validate_limit(data)
  conditions = data['ScanFilter'] || {}
  all_items = drop_till_start(items.values, data['ExclusiveStartKey'], true)
  result, last_evaluated_item, scaned_count = filter(all_items, conditions, data['Limit'], false)
  response = {
    'Count' => result.size,
    'ScannedCount' => scaned_count,
    'ConsumedCapacityUnits' => 1 }

  unless data['Count']
    response['Items'] = result.map { |r| filter_attributes(r, data['AttributesToGet']) }
  end

  if last_evaluated_item
    response['LastEvaluatedKey'] = last_evaluated_item.key.as_key_hash
  end

  response
end

#size_description ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 48

def size_description
  { 'ItemCount' => items.count,
    'TableSizeBytes' => size_bytes }
end

#update(read_capacity_units, write_capacity_units) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 66

def update(read_capacity_units, write_capacity_units)
  if @read_capacity_units > read_capacity_units
    @last_decreased_time = Time.now.to_i
  elsif @read_capacity_units < read_capacity_units
    @last_increased_time = Time.now.to_i
  end

  if @write_capacity_units > write_capacity_units
    @last_decreased_time = Time.now.to_i
  elsif @write_capacity_units < write_capacity_units
    @last_increased_time = Time.now.to_i
  end

  @read_capacity_units, @write_capacity_units = read_capacity_units, write_capacity_units

  response = description.merge(size_description)

  if last_increased_time
    response['TableDescription']['ProvisionedThroughput']['LastIncreaseDateTime'] = @last_increased_time
  end

  if last_decreased_time
    response['TableDescription']['ProvisionedThroughput']['LastDecreaseDateTime'] = @last_decreased_time
  end

  response['TableDescription']['TableStatus'] = 'UPDATING'
  response
end

#update_item(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 156

def update_item(data)
  key = Key.from_data(data['Key'], key_schema)
  item = @items[key]
  check_conditions(item, data['Expected'])

  unless item
    if create_item?(data)
      item = @items[key] = Item.from_key(key)
    else
      return consumed_capacity
    end
    item_created = true
  end

  old_item = deep_copy(item)
  begin
    old_hash = item.as_hash
    data['AttributeUpdates'].each do |name, update_data|
      item.update(name, update_data)
    end
  rescue => e
    if item_created
      @items.delete(key)
    else
      @items[key] = old_item
    end
    raise e
  end

  consumed_capacity.merge(return_values(data, old_hash, item))
end

#updated_attributes(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 325

def updated_attributes(data)
  data['AttributeUpdates'].map { |name, _| name }
end

#validate_limit(data) ⇒ Object 



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# File 'lib/fake_dynamo/table.rb', line 256

def validate_limit(data)
  if data['Limit'] and data['Limit'] <= 0
    raise ValidationException, "Limit failed to satisfy constraint: Member must have value greater than or equal to 1"
  end
end