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) ⇒ TestClient

Returns a new instance of TestClient.



9
10
11
12
13
 
# File 'lib/dynamini/test_client.rb', line 9

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

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



7
8
9
 
# 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.



7
8
9
 
# 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.



7
8
9
 
# File 'lib/dynamini/test_client.rb', line 7

def range_key_attr
  @range_key_attr
end

Instance Method Details

#batch_get_item(args = {}) ⇒ Object

No range key support - use query instead.



65
66
67
68
69
70
71
72
73
74
75
76
77
 
# File 'lib/dynamini/test_client.rb', line 65

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



80
81
82
83
84
85
86
87
88
 
# File 'lib/dynamini/test_client.rb', line 80

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 



90
91
92
 
# File 'lib/dynamini/test_client.rb', line 90

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

#get_item(args = {}) ⇒ Object 



52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/dynamini/test_client.rb', line 52

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_table(table_name) ⇒ Object 



15
16
17
 
# File 'lib/dynamini/test_client.rb', line 15

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

#query(args = {}) ⇒ Object 



94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/dynamini/test_client.rb', line 94

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+/)
  hash_key = tokens[2]
  case tokens[5]
    when ">="
      start_val = tokens[6]
      end_val = nil
    when "<="
      start_val = nil
      end_val = tokens[6]
    when "BETWEEN"
      start_val = tokens[6]
      end_val = tokens[8]
    else
      start_val = nil
      end_val = nil
  end
  parent = get_table(args[:table_name])[hash_key]
  return OpenStruct.new(items:[]) unless parent

  selected = parent.values
  selected = selected.select{ |item| item[@range_key_attr] >= start_val.to_f } if start_val
  selected = selected.select{ |item| item[@range_key_attr] <= end_val.to_f } if end_val

  OpenStruct.new(items: selected)
end

#reset ⇒ Object 



131
132
133
 
# File 'lib/dynamini/test_client.rb', line 131

def reset
  @data = {}
end

#update_item(args = {}) ⇒ Object 



19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/dynamini/test_client.rb', line 19

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
  )

  if hash_key_value
    if range_key_value
      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

    else
      if table[hash_key_value]
        table[hash_key_value].merge!(updates)
      else
        table[hash_key_value] = updates
      end
    end
  end

end