Class: Rack::MiniProfiler::RedisStore

Inherits:
AbstractStore show all
Defined in:
lib/mini_profiler/storage/redis_store.rb

Constant Summary collapse

EXPIRES_IN_SECONDS = 
60 * 60 * 24

Constants inherited from AbstractStore

AbstractStore::MAX_TOKEN_AGE

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args = nil) ⇒ RedisStore

Returns a new instance of RedisStore.



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# File 'lib/mini_profiler/storage/redis_store.rb', line 9

def initialize(args = nil)
  @args               = args || {}
  @prefix             = @args.delete(:prefix)     || 'MPRedisStore'
  @redis_connection   = @args.delete(:connection)
  @expires_in_seconds = @args.delete(:expires_in) || EXPIRES_IN_SECONDS
end

Instance Attribute Details

#prefix ⇒ Object (readonly)

Returns the value of attribute prefix.



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# File 'lib/mini_profiler/storage/redis_store.rb', line 5

def prefix
  @prefix
end

Instance Method Details

#allowed_tokens ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 80

def allowed_tokens
  key1, key1_old, key2 = redis.mget("#{@prefix}-key1", "#{@prefix}-key1_old", "#{@prefix}-key2")

  if key1 && (key1.length == 32)
    return [key1, key2].compact
  end

  timeout = Rack::MiniProfiler::AbstractStore::MAX_TOKEN_AGE

  # TODO  this could be moved to lua to correct a concurrency flaw
  # it is not critical cause worse case some requests will miss profiling info

  # no key so go ahead and set it
  key1 = SecureRandom.hex

  if key1_old && (key1_old.length == 32)
    key2 = key1_old
    redis.setex "#{@prefix}-key2", timeout, key2
  else
    key2 = nil
  end

  redis.setex "#{@prefix}-key1", timeout, key1
  redis.setex "#{@prefix}-key1_old", timeout*2, key1

  [key1, key2].compact
end

#diagnostics(user) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 64

def diagnostics(user)
"Redis prefix: #{@prefix}
Redis location: #{redis.client.host}:#{redis.client.port} db: #{redis.client.db}
unviewed_ids: #{get_unviewed_ids(user)}
"
end

#flush_tokens ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 71

def flush_tokens
  redis.del("#{@prefix}-key1", "#{@prefix}-key1_old", "#{@prefix}-key2")
end

#get_unviewed_ids(user) ⇒ Object

Remove expired ids from the unviewed sorted set and return the remaining ids



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# File 'lib/mini_profiler/storage/redis_store.rb', line 58

def get_unviewed_ids(user)
  key = user_key(user)
  redis.zremrangebyscore(key, '-inf', Time.now.to_i)
  redis.zrevrangebyscore(key, '+inf', '-inf')
end

#load(id) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 20

def load(id)
  key = prefixed_id(id)
  raw = redis.get key
  begin
    Marshal::load(raw) if raw
  rescue
    # bad format, junk old data
    redis.del key
    nil
  end
end

#save(page_struct) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 16

def save(page_struct)
  redis.setex prefixed_id(page_struct[:id]), @expires_in_seconds, Marshal::dump(page_struct)
end

#set_all_unviewed(user, ids) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 41

def set_all_unviewed(user, ids)
  key = user_key(user)
  redis.del(key)
  ids.each do |id|
    if redis.exists(prefixed_id(id))
      expire_at = Time.now.to_i + redis.ttl(prefixed_id(id))
      redis.zadd(key, expire_at, id)
    end
  end
  redis.expire(key, @expires_in_seconds)
end

#set_unviewed(user, id) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 32

def set_unviewed(user, id)
  key = user_key(user)
  if redis.exists(prefixed_id(id))
    expire_at = Time.now.to_i + redis.ttl(prefixed_id(id))
    redis.zadd(key, expire_at, id)
  end
  redis.expire(key, @expires_in_seconds)
end

#set_viewed(user, id) ⇒ Object 



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# File 'lib/mini_profiler/storage/redis_store.rb', line 53

def set_viewed(user, id)
  redis.zrem(user_key(user), id)
end

#simulate_expire ⇒ Object

Only used for testing



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# File 'lib/mini_profiler/storage/redis_store.rb', line 76

def simulate_expire
  redis.del("#{@prefix}-key1")
end