BenClaw
3e4bcc80c8
- Add Mozo::Counter::Redis with same get/set/incr/decr interface - Add redis gem (~> 5.0) to Gemfile - Update cable.yml to use Redis adapter in production (shared with counters) - Document DrbCounter → Redis migration in broadcasting-migration.md - Redis installed and running on vmi3300327 - Leave Faye as current broadcaster; both switches are one-line changes DrbCounter problems solved: - In-memory → persistent (RDB + AOF) - Single-process DRb → multi-process safe Redis - Atomic INCR/DECR across Puma workers - One less custom process to manage
81 lines
2.4 KiB
Ruby
81 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Mozo
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module Counter
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# Redis-backed counter adapter. Replaces the DrbCounter (in-memory,
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# single-process, DRb-based) with a persistent, multi-process-safe,
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# battle-tested key-value store.
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#
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# Benefits over DrbCounter:
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# - Persistent (survives restarts, no CouchDB reload dance)
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# - Atomic INCR/DECR (no race conditions between Puma workers)
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# - No separate process to manage (Redis is already needed for ActionCable)
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# - Production-ready, widely deployed
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#
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# Usage:
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# Mozo::Counter.connection = Mozo::Counter::Redis.new
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# # or with custom config:
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# Mozo::Counter.connection = Mozo::Counter::Redis.new(url: "redis://localhost:6379/2")
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#
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class Redis
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def initialize(url: nil)
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require 'redis'
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@redis = ::Redis.new(url: url || ENV.fetch('REDIS_URL', 'redis://localhost:6379/0'))
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end
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def get(key, options = {})
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value = @redis.get(key)
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quiet = options[:quiet]
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unless quiet
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Rails.logger.debug("[REDIS_COUNTER] GET #{key} = #{value.inspect}")
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end
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value&.to_i || 0
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rescue => e
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Rails.logger.error("[REDIS_COUNTER] GET #{key} failed: #{e.message}")
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0
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end
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def set(key, value)
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Rails.logger.debug("[REDIS_COUNTER] SET #{key} = #{value}")
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@redis.set(key, value)
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rescue => e
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Rails.logger.error("[REDIS_COUNTER] SET #{key} failed: #{e.message}")
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value
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end
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def incr(key, options = {})
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initial = options[:initial] || 1
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Rails.logger.debug("[REDIS_COUNTER] INCR #{key}")
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if @redis.exists?(key)
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@redis.incr(key)
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else
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@redis.set(key, initial)
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initial
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end
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rescue => e
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Rails.logger.error("[REDIS_COUNTER] INCR #{key} failed: #{e.message}")
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initial
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end
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def decr(key, options = {})
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initial = options[:initial] || 0
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Rails.logger.debug("[REDIS_COUNTER] DECR #{key}")
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if @redis.exists?(key)
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@redis.decr(key)
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else
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@redis.set(key, initial)
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initial
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end
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rescue => e
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Rails.logger.error("[REDIS_COUNTER] DECR #{key} failed: #{e.message}")
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initial
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end
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def flush
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Rails.logger.debug("[REDIS_COUNTER] FLUSHDB")
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@redis.flushdb
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end
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end
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end
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end
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