66 lines
2.5 KiB
Lua
66 lines
2.5 KiB
Lua
local tickets_key = KEYS[1]
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local owners_key = KEYS[2]
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local worker_index_key = KEYS[3]
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local proxy_id = ARGV[1]
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local worker_id = ARGV[2]
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local assignment_epoch = tonumber(ARGV[3])
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local required_epoch = tonumber(ARGV[4])
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local session_id = ARGV[5]
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local version = tonumber(ARGV[6])
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local snapshot_epoch = tonumber(ARGV[7])
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local checksum = ARGV[8]
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local function reply(status)
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return cjson.encode({status = status})
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end
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local function decode_table(raw)
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if not raw then
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return nil
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end
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local ok, value = pcall(cjson.decode, raw)
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if not ok or type(value) ~= 'table' then
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return nil
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end
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return value
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end
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local function valid_checksum(value)
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return type(value) == 'string' and string.len(value) == 64 and string.match(value, '^[0-9a-f]+$') ~= nil
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end
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if type(proxy_id) ~= 'string' or proxy_id == '' or type(worker_id) ~= 'string' or worker_id == '' or
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not assignment_epoch or assignment_epoch <= 0 or not required_epoch or required_epoch <= assignment_epoch or
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type(session_id) ~= 'string' or session_id == '' or not version or version <= 0 or
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not snapshot_epoch or snapshot_epoch < required_epoch or not valid_checksum(checksum) then
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return reply('invalid')
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end
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local ticket = decode_table(redis.call('HGET', tickets_key, proxy_id))
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local assignment = decode_table(redis.call('HGET', owners_key, proxy_id))
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if not ticket or ticket.version ~= 1 or ticket.proxyId ~= proxy_id or ticket.workerId ~= worker_id or
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ticket.workerIndexKey ~= worker_index_key or tonumber(ticket.assignmentEpoch) ~= assignment_epoch or
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tonumber(ticket.requiredSnapshotEpoch) ~= required_epoch or not assignment or assignment.version ~= 1 or
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assignment.draining ~= true or assignment.workerId ~= worker_id or tonumber(assignment.epoch) ~= assignment_epoch then
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return reply('stale')
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end
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local current_epoch = tonumber(ticket.snapshotOwnershipEpoch) or 0
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local current_version = tonumber(ticket.snapshotVersion) or 0
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if current_epoch > snapshot_epoch or (current_epoch == snapshot_epoch and current_version > version) then
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return reply('ok')
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end
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if current_epoch == snapshot_epoch and current_version == version then
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if ticket.sessionId ~= session_id or ticket.snapshotChecksum ~= checksum then
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return reply('stale')
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end
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return reply('ok')
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end
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ticket.sessionId = session_id
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ticket.snapshotVersion = version
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ticket.snapshotOwnershipEpoch = snapshot_epoch
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ticket.snapshotChecksum = checksum
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redis.call('HSET', tickets_key, proxy_id, cjson.encode(ticket))
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return reply('ok')
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