Class: Rollout::Adapters::Redis

Inherits:
Object
  • Object
show all
Defined in:
lib/rollout/adapters/redis.rb

Constant Summary collapse

FEATURES_KEY = 
'feature:__features__'

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ Redis

Returns a new instance of Redis.



13
14
15
 
# File 'lib/rollout/adapters/redis.rb', line 13

def initialize(client)
  @client = client
end

Instance Method Details

#clear_features ⇒ Object 



53
54
55
 
# File 'lib/rollout/adapters/redis.rb', line 53

def clear_features
  @client.del(FEATURES_KEY)
end

#delete_feature(name) ⇒ Object 



46
47
48
49
50
51
 
# File 'lib/rollout/adapters/redis.rb', line 46

def delete_feature(name)
  names = feature_names
  names.delete(name.to_s)
  @client.set(FEATURES_KEY, names.join(','))
  @client.del(key(name))
end

#delete_feature_events(name) ⇒ Object 



95
96
97
 
# File 'lib/rollout/adapters/redis.rb', line 95

def delete_feature_events(name)
  @client.del(events_key(name))
end

#feature_events(name, limit: nil) ⇒ Object 



82
83
84
 
# File 'lib/rollout/adapters/redis.rb', line 82

def feature_events(name, limit: nil)
  events_from(events_key(name), limit: limit)
end

#feature_exists?(name) ⇒ Boolean

Returns:

  • (Boolean) 


32
33
34
35
36
37
38
 
# File 'lib/rollout/adapters/redis.rb', line 32

def feature_exists?(name)
  if @client.respond_to?(:exists?)
    @client.exists?(key(name))
  else
    @client.exists(key(name))
  end
end

#feature_names ⇒ Object 



28
29
30
 
# File 'lib/rollout/adapters/redis.rb', line 28

def feature_names
  (@client.get(FEATURES_KEY) || '').split(',')
end

#feature_updated_at(name) ⇒ Object 



90
91
92
93
 
# File 'lib/rollout/adapters/redis.rb', line 90

def feature_updated_at(name)
  _, score = @client.zrange(events_key(name), 0, 0, with_scores: true).first
  Time.at(-score.to_f / 1_000_000) if score
end

#fetch_feature(name) ⇒ Object 



17
18
19
 
# File 'lib/rollout/adapters/redis.rb', line 17

def fetch_feature(name)
  ::Rollout::Redis::Codec.decode(name, @client.get(key(name)))
end

#fetch_features(names) ⇒ Object 



21
22
23
24
25
26
 
# File 'lib/rollout/adapters/redis.rb', line 21

def fetch_features(names)
  return [] if names.empty?

  payloads = @client.mget(*names.map { |name| key(name) })
  names.zip(payloads).map { |name, payload| ::Rollout::Redis::Codec.decode(name, payload) }
end

#global_events(limit: nil) ⇒ Object 



86
87
88
 
# File 'lib/rollout/adapters/redis.rb', line 86

def global_events(limit: nil)
  events_from(global_events_key, limit: limit)
end

#mutate_feature(name) ⇒ Object 



57
58
59
60
61
62
63
64
65
66
67
68
69
 
# File 'lib/rollout/adapters/redis.rb', line 57

def mutate_feature(name)
  mutation = yield fetch_feature(name)
  save_feature(mutation.fetch(:state))
  event = mutation[:event]
  if event
    record_event(
      event,
      history_length: mutation.fetch(:history_length),
      global: mutation[:global],
    )
  end
  mutation
end

#record_event(event, history_length:, global: false) ⇒ Object 



71
72
73
74
75
76
77
78
79
80
 
# File 'lib/rollout/adapters/redis.rb', line 71

def record_event(event, history_length:, global: false)
  storage_key = events_key(event.feature)
  @client.zadd(storage_key, -event.timestamp, event.serialize)
  @client.zremrangebyrank(storage_key, history_length, -1)

  return unless global

  @client.zadd(global_events_key, -event.timestamp, event.serialize)
  @client.zremrangebyrank(global_events_key, history_length, -1)
end

#save_feature(state) ⇒ Object 



40
41
42
43
44
 
# File 'lib/rollout/adapters/redis.rb', line 40

def save_feature(state)
  @client.set(key(state.name), ::Rollout::Redis::Codec.encode(state))
  names = feature_names.map(&:to_s) | [state.name.to_s]
  @client.set(FEATURES_KEY, names.join(','))
end