Class: Stoplight::Wiring::Redis::Backend Private

Inherits:
DataStoreBackend show all
Defined in:
lib/stoplight/wiring/redis/backend.rb

Overview

This class is part of a private API. You should avoid using this class if possible, as it may be removed or be changed in the future.

Redis storage backend with automatic failover to in-memory storage.

Every storage component is wrapped in a FailSafe decorator that catches Redis connection errors and falls back to a Memory backend. This ensures circuit breakers remain functional even when Redis is unavailable.

The failover behavior is coordinated through a dedicated circuit breaker (‘failover_light`) that prevents repeated Redis connection attempts during an outage.

Examples:

backend = Redis::Backend.new(
  redis: redis_connection,
  scripting: Scripting.new(redis:),
  key_space: KeySpace.build(system_name: "payments", light_name: "stripe"),
  config: light_config,
  error_notifier: ->(e) { Logger.error(e) },
  failover_light: Stoplight("redis-failover"),
  clock: SystemClock.new
)

backend.state_store #=> FailSafe::State wrapping Redis::State

Instance Method Summary collapse

Constructor Details

#initialize(redis:, scripting:, key_space:, config:, error_notifier:, failover_light:, clock:) ⇒ Backend

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Returns a new instance of Backend.



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# File 'lib/stoplight/wiring/redis/backend.rb', line 31

def initialize(redis:, scripting:, key_space:, config:, error_notifier:, failover_light:, clock:)
  @redis = redis
  @scripting = scripting
  @key_space = key_space
  @clock = clock
  @config = config
  @error_notifier = error_notifier
  @failover_light = failover_light
  @memory_fallback = Memory::Backend.new(clock:, config:)
end

Instance Method Details

#recovery_lock_store ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/stoplight/wiring/redis/backend.rb', line 57

def recovery_lock_store
  @recovery_lock_store ||= Infrastructure::FailSafe::Storage::RecoveryLock.new(
    primary_store: Infrastructure::Redis::Storage::RecoveryLock.new(
      config: @config, # TODO: pass cool_off_time directly
      redis: @redis,
      scripting: @scripting,
      key_space: @key_space
    ),
    error_notifier: @error_notifier,
    failover_store: @memory_fallback.recovery_lock_store,
    circuit_breaker: @failover_light
  )
end

#recovery_metrics_store ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/stoplight/wiring/redis/backend.rb', line 71

def recovery_metrics_store
  @recovery_metrics_store ||= Infrastructure::FailSafe::Storage::Metrics.new(
    error_notifier: @error_notifier,
    primary_store: Infrastructure::Redis::Storage::RecoveryMetrics.new(
      clock: @clock,
      redis: @redis,
      scripting: @scripting,
      key_space: @key_space
    ),
    failover_store: @memory_fallback.recovery_metrics_store,
    circuit_breaker: @failover_light
  )
end

#state_store ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/stoplight/wiring/redis/backend.rb', line 42

def state_store
  @state_store ||= Infrastructure::FailSafe::Storage::State.new(
    primary_store: Infrastructure::Redis::Storage::State.new(
      redis: @redis,
      scripting: @scripting,
      key_space: @key_space,
      cool_off_time: @config.cool_off_time,
      clock: @clock
    ),
    error_notifier: @error_notifier,
    failover_store: @memory_fallback.state_store,
    circuit_breaker: @failover_light
  )
end

#unbounded_metrics_store ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/stoplight/wiring/redis/backend.rb', line 100

def unbounded_metrics_store
  @unbounded_metrics_store ||= Infrastructure::FailSafe::Storage::Metrics.new(
    error_notifier: @error_notifier,
    primary_store: Infrastructure::Redis::Storage::UnboundedMetrics.new(
      clock: @clock,
      redis: @redis,
      scripting: @scripting,
      key_space: @key_space
    ),
    failover_store: @memory_fallback.unbounded_metrics_store,
    circuit_breaker: @failover_light
  )
end

#windowed_metrics_store ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/stoplight/wiring/redis/backend.rb', line 85

def windowed_metrics_store
  @windowed_metrics_store ||= Infrastructure::FailSafe::Storage::Metrics.new(
    error_notifier: @error_notifier,
    primary_store: Infrastructure::Redis::Storage::WindowMetrics.new(
      config: @config, # TODO: pass window size directly
      redis: @redis,
      scripting: @scripting,
      clock: @clock,
      key_space: @key_space
    ),
    failover_store: @memory_fallback.windowed_metrics_store,
    circuit_breaker: @failover_light
  )
end