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<?php
namespace Illuminate\Queue;
class LuaScripts
{
/**
* Get the Lua script for computing the size of queue.
*
* KEYS[1] - The name of the primary queue
* KEYS[2] - The name of the "delayed" queue
* KEYS[3] - The name of the "reserved" queue
*
* @return string
*/
public static function size()
{
return <<<'LUA'
return redis.call('llen', KEYS[1]) + redis.call('zcard', KEYS[2]) + redis.call('zcard', KEYS[3])
LUA;
}
/**
* Get the Lua script for pushing jobs onto the queue.
*
* KEYS[1] - The queue to push the job onto, for example: queues:foo
* KEYS[2] - The notification list for the queue we are pushing jobs onto, for example: queues:foo:notify
* ARGV[1] - The job payload
*
* @return string
*/
public static function push()
{
return <<<'LUA'
-- Push the job onto the queue...
redis.call('rpush', KEYS[1], ARGV[1])
-- Push a notification onto the "notify" queue...
redis.call('rpush', KEYS[2], 1)
LUA;
}
/**
* Get the Lua script for popping the next job off of the queue.
*
* KEYS[1] - The queue to pop jobs from, for example: queues:foo
* KEYS[2] - The queue to place reserved jobs on, for example: queues:foo:reserved
* KEYS[3] - The notify queue
* ARGV[1] - The time at which the reserved job will expire
*
* @return string
*/
public static function pop()
{
return <<<'LUA'
-- Pop the first job off of the queue...
local job = redis.call('lpop', KEYS[1])
local reserved = false
if(job ~= false) then
-- Increment the attempt count and place job on the reserved queue...
reserved = cjson.decode(job)
reserved['attempts'] = reserved['attempts'] + 1
reserved = cjson.encode(reserved)
redis.call('zadd', KEYS[2], ARGV[1], reserved)
redis.call('lpop', KEYS[3])
end
return {job, reserved}
LUA;
}
/**
* Get the Lua script for releasing reserved jobs.
*
* KEYS[1] - The "delayed" queue we release jobs onto, for example: queues:foo:delayed
* KEYS[2] - The queue the jobs are currently on, for example: queues:foo:reserved
* ARGV[1] - The raw payload of the job to add to the "delayed" queue
* ARGV[2] - The UNIX timestamp at which the job should become available
*
* @return string
*/
public static function release()
{
return <<<'LUA'
-- Remove the job from the current queue...
redis.call('zrem', KEYS[2], ARGV[1])
-- Add the job onto the "delayed" queue...
redis.call('zadd', KEYS[1], ARGV[2], ARGV[1])
return true
LUA;
}
/**
* Get the Lua script to migrate expired jobs back onto the queue.
*
* KEYS[1] - The queue we are removing jobs from, for example: queues:foo:reserved
* KEYS[2] - The queue we are moving jobs to, for example: queues:foo
* KEYS[3] - The notification list for the queue we are moving jobs to, for example queues:foo:notify
* ARGV[1] - The current UNIX timestamp
*
* @return string
*/
public static function migrateExpiredJobs()
{
return <<<'LUA'
-- Get all of the jobs with an expired "score"...
local val = redis.call('zrangebyscore', KEYS[1], '-inf', ARGV[1], 'limit', 0, ARGV[2])
-- If we have values in the array, we will remove them from the first queue
-- and add them onto the destination queue in chunks of 100, which moves
-- all of the appropriate jobs onto the destination queue very safely.
if(next(val) ~= nil) then
redis.call('zremrangebyrank', KEYS[1], 0, #val - 1)
for i = 1, #val, 100 do
redis.call('rpush', KEYS[2], unpack(val, i, math.min(i+99, #val)))
-- Push a notification for every job that was migrated...
for j = i, math.min(i+99, #val) do
redis.call('rpush', KEYS[3], 1)
end
end
end
return val
LUA;
}
/**
* Get the Lua script for removing all jobs from the queue.
*
* KEYS[1] - The name of the primary queue
* KEYS[2] - The name of the "delayed" queue
* KEYS[3] - The name of the "reserved" queue
* KEYS[4] - The name of the "notify" queue
*
* @return string
*/
public static function clear()
{
return <<<'LUA'
local size = redis.call('llen', KEYS[1]) + redis.call('zcard', KEYS[2]) + redis.call('zcard', KEYS[3])
redis.call('del', KEYS[1], KEYS[2], KEYS[3], KEYS[4])
return size
LUA;
}
}
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