140 lines
4.5 KiB
Lua
140 lines
4.5 KiB
Lua
local records_key = KEYS[1]
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local unique_key = KEYS[2]
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local idkeys_key = KEYS[3]
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local expiry_key = KEYS[4]
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local available_key = KEYS[5]
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local inventory_key = KEYS[6]
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local state_inventory_key = KEYS[7]
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local owners_key = KEYS[8]
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local owner_expiry_key = KEYS[9]
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local operation_key = KEYS[10]
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local operation = ARGV[1]
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local now_ms = tonumber(ARGV[2])
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local limit = tonumber(ARGV[3])
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local upstream_id = ARGV[4]
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local operation_ttl_ms = tonumber(ARGV[5])
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local function finish(reply)
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local encoded = cjson.encode(reply)
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redis.call('SET', operation_key, encoded, 'PX', operation_ttl_ms)
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return encoded
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end
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local committed = redis.call('GET', operation_key)
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if committed then
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return committed
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end
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local function is_managed(state)
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return state == 'FETCHED' or state == 'CHECKING' or state == 'AVAILABLE' or
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state == 'SUSPECT' or state == 'DRAINING'
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end
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local function decrement_inventory(upstream)
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if type(upstream) ~= 'string' or upstream == '' then
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return
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end
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local count = redis.call('HINCRBY', inventory_key, upstream, -1)
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if count < 0 then
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redis.call('HSET', inventory_key, upstream, 0)
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end
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end
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local function state_field(upstream, state)
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return string.len(upstream) .. ':' .. upstream .. ':' .. state
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end
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local function is_counted(state)
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return state == 'FETCHED' or state == 'CHECKING' or state == 'AVAILABLE' or
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state == 'SUSPECT' or state == 'DRAINING' or state == 'UNHEALTHY' or state == 'EXTRACTED'
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end
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local function decrement_state(upstream, state)
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if type(upstream) ~= 'string' or upstream == '' or not is_counted(state) then
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return
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end
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local field = state_field(upstream, state)
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local count = redis.call('HINCRBY', state_inventory_key, field, -1)
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if count <= 0 then
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redis.call('HDEL', state_inventory_key, field)
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end
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end
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local function remove_available(proxy_id, record)
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redis.call('ZREM', available_key, proxy_id)
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local index_keys = record and record.indexKeys
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if type(index_keys) == 'table' then
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for _, index_key in ipairs(index_keys) do
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if type(index_key) == 'string' and index_key ~= '' then
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redis.call('ZREM', index_key, proxy_id)
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end
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end
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end
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end
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local function remove_owned(proxy_id, record)
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if record and type(record.ownerIndexKey) == 'string' and record.ownerIndexKey ~= '' then
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redis.call('ZREM', record.ownerIndexKey, proxy_id)
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end
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end
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local function remove_worker_owned(proxy_id)
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local raw = redis.call('HGET', owners_key, proxy_id)
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if not raw then
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return
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end
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local decoded, assignment = pcall(cjson.decode, raw)
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if decoded and type(assignment) == 'table' and
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type(assignment.workerIndexKey) == 'string' and assignment.workerIndexKey ~= '' then
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redis.call('ZREM', assignment.workerIndexKey, proxy_id)
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end
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end
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local function remove_proxy(proxy_id)
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local raw = redis.call('HGET', records_key, proxy_id)
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local record = nil
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if raw then
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local decoded
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decoded, record = pcall(cjson.decode, raw)
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remove_available(proxy_id, decoded and record or nil)
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remove_owned(proxy_id, decoded and record or nil)
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if decoded and type(record) == 'table' and is_managed(record.state) then
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decrement_inventory(record.sourceUpstream)
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end
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if decoded and type(record) == 'table' then
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decrement_state(record.sourceUpstream, record.state)
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end
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else
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redis.call('ZREM', available_key, proxy_id)
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end
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local digest = redis.call('HGET', idkeys_key, proxy_id)
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if digest and redis.call('HGET', unique_key, digest) == proxy_id then
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redis.call('HDEL', unique_key, digest)
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end
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redis.call('HDEL', idkeys_key, proxy_id)
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redis.call('HDEL', records_key, proxy_id)
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redis.call('ZREM', expiry_key, proxy_id)
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remove_worker_owned(proxy_id)
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redis.call('HDEL', owners_key, proxy_id)
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redis.call('ZREM', owner_expiry_key, proxy_id)
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end
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local expired = redis.call('ZRANGEBYSCORE', expiry_key, '-inf', now_ms, 'LIMIT', 0, limit)
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for _, proxy_id in ipairs(expired) do
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remove_proxy(proxy_id)
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end
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if operation == 'sweep' then
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return finish({status = 'ok', count = #expired})
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end
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if operation == 'inventory' then
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local count = tonumber(redis.call('HGET', inventory_key, upstream_id) or '0')
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if count < 0 then
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count = 0
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redis.call('HSET', inventory_key, upstream_id, 0)
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end
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return finish({status = 'ok', count = count})
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end
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return finish({status = 'invalid', count = 0})
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