Class: Dynamini::TestClient

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamini/test_client.rb

Overview

In-memory database client for test purposes.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash_key_attr, range_key_attr = nil, secondary_index = nil) ⇒ TestClient

Returns a new instance of TestClient.



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# File 'lib/dynamini/test_client.rb', line 9

def initialize(hash_key_attr, range_key_attr = nil, secondary_index=nil)
  @data = {}
  @hash_key_attr = hash_key_attr
  @range_key_attr = range_key_attr
  @secondary_index = secondary_index
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/dynamini/test_client.rb', line 7

def data
  @data
end

#hash_key_attr ⇒ Object (readonly)

Returns the value of attribute hash_key_attr.



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# File 'lib/dynamini/test_client.rb', line 7

def hash_key_attr
  @hash_key_attr
end

#range_key_attr ⇒ Object (readonly)

Returns the value of attribute range_key_attr.



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# File 'lib/dynamini/test_client.rb', line 7

def range_key_attr
  @range_key_attr
end

#secondary_index ⇒ Object (readonly)

Returns the value of attribute secondary_index.



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# File 'lib/dynamini/test_client.rb', line 7

def secondary_index
  @secondary_index
end

Instance Method Details

#apply_filter_options(parent, args, start_val, end_val) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 138

def apply_filter_options(parent, args, start_val, end_val)
  records = parent.values
  records = records.select { |record| record[@range_key_attr] >= start_val.to_f } if start_val
  records = records.select { |record| record[@range_key_attr] <= end_val.to_f } if end_val
  records = records.sort! { |a, b| b[@range_key_attr] <=> a[@range_key_attr] } if args[:scan_index_forward] == false
  records = records[0...args[:limit]] if args[:limit]
  records
end

#batch_get_item(args = {}) ⇒ Object

No range key support - use query instead.



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# File 'lib/dynamini/test_client.rb', line 73

def batch_get_item(args = {})
  responses = {}

  args[:request_items].each do |table_name, get_request|
    responses[table_name] = []
    get_request[:keys].each do |key_hash|
      item = get_table(table_name)[key_hash.values.first]
      responses[table_name] << item unless item.nil?
    end
  end

  OpenStruct.new(responses: responses)
end

#batch_write_item(request_options) ⇒ Object

TODO add range key support



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# File 'lib/dynamini/test_client.rb', line 88

def batch_write_item(request_options)
  request_options[:request_items].each do |table_name, put_requests|
    put_requests.each do |request_hash|
      item = request_hash[:put_request][:item]
      key = item[hash_key_attr.to_s]
      get_table(table_name)[key] = item
    end
  end
end

#delete_item(args = {}) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 98

def delete_item(args = {})
  get_table(args[:table_name]).delete(args[:key][hash_key_attr])
end

#get_item(args = {}) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 60

def get_item(args = {})
  table = get_table(args[:table_name])

  hash_key_value = args[:key][hash_key_attr]
  range_key_value = args[:key][range_key_attr]

  attributes_hash = table[hash_key_value]
  attributes_hash = attributes_hash[range_key_value] if attributes_hash && range_key_value

  OpenStruct.new(item: attributes_hash)
end

#get_secondary_hash_key(index) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 170

def get_secondary_hash_key(index)
  index[:hash_key_name] == @hash_key_attr ? index[:hash_key_name] : index[:hash_key_name].to_s
end

#get_secondary_range_key(index) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 174

def get_secondary_range_key(index)
  index[:range_key_name] == @range_key_attr ? index[:range_key_name] : index[:range_key_name].to_s
end

#get_table(table_name) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 16

def get_table(table_name)
  @data[table_name] ||= {}
end

#primary_index_insertion(hash_key_value, range_key_value, updates, table) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 36

def primary_index_insertion(hash_key_value, range_key_value, updates, table)
  if range_key_value
    primary_with_range_insertion(hash_key_value, range_key_value, updates, table)
  else
    primary_only_hash_insertion(hash_key_value, updates, table)
  end
end

#primary_only_hash_insertion(hash_key_value, updates, table) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 54

def primary_only_hash_insertion(hash_key_value, updates, table)
  table[hash_key_value] ? table[hash_key_value].merge!(updates) : table[hash_key_value] = updates
end

#primary_with_range_insertion(hash_key_value, range_key_value, updates, table) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 44

def primary_with_range_insertion(hash_key_value, range_key_value, updates, table)
  updates.merge!(range_key_attr => range_key_value)
  if table[hash_key_value] && table[hash_key_value][range_key_value]
    table[hash_key_value][range_key_value].merge! updates
  else
    table[hash_key_value] ||= {}
    table[hash_key_value][range_key_value] = updates
  end
end

#query(args = {}) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 102

def query(args = {})
  # Possible key condition structures:
  # "foo = val"
  # "foo = val AND bar <= val2"
  # "foo = val AND bar >= val2"
  # "foo = val AND bar BETWEEN val2 AND val3"

  args[:expression_attribute_values].each do |symbol, value|
    args[:key_condition_expression].gsub!(symbol, value.to_s)
  end

  tokens = args[:key_condition_expression].split(/\s+/)
  start_val, end_val = range_key_limits(tokens)

  if args[:index_name]
    secondary_index_query(args)
  else
    hash_key = hash_key_value(args).is_a?(Integer) ? tokens[2].to_i : tokens[2]

    parent = get_table(args[:table_name])[hash_key]
    return OpenStruct.new(items: []) unless parent
    selected = apply_filter_options(parent, args, start_val, end_val)

    OpenStruct.new(items: selected)
  end
end

#range_key_limits(tokens) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 129

def range_key_limits(tokens)
  case tokens[5]
    when ">=" then [tokens[6], nil]
    when "<=" then [nil, tokens[6]]
    when "BETWEEN" then [tokens[6], tokens[8]]
    else [nil, nil]
  end
end

#reset ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 178

def reset
  @data = {}
end

#secondary_index_query(args = {}) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 148

def secondary_index_query(args = {})
  index = secondary_index[args[:index_name]]
  table = get_table(args[:table_name])

  tokens = args[:key_condition_expression].split(/\s+/)
  start_val, end_val = range_key_limits(tokens)

  records = @range_key_attr ? get_values(table) : table.values
  selected = sort_records(records, index, args, start_val, end_val)
  OpenStruct.new(items: selected)
end

#sort_records(records, index, args, start_val, end_val) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 160

def sort_records(records, index, args, start_val, end_val)
  records = records.select { |record| record[get_secondary_hash_key(index)] == hash_key_value(args) }
  records = records.select { |record| record[get_secondary_range_key(index)] >= start_val.to_f } if start_val
  records = records.select { |record| record[get_secondary_range_key(index)] <= end_val.to_f } if end_val
  records = records.sort { |a, b| a[get_secondary_range_key(index)] <=> b[get_secondary_range_key(index)] }
  records = records.reverse if args[:scan_index_forward] == false
  records = records[0...args[:limit]] if args[:limit]
  records
end

#update_item(args = {}) ⇒ Object 



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# File 'lib/dynamini/test_client.rb', line 20

def update_item(args = {})
  table = get_table(args[:table_name])

  keys = args[:key]

  hash_key_value = keys[hash_key_attr]
  range_key_value = keys[range_key_attr]

  updates = flatten_attribute_updates(args).merge(
      hash_key_attr => hash_key_value
  )

  primary_index_insertion(hash_key_value, range_key_value, updates, table) if hash_key_value

end