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borbit/redis_cas.js

Last active March 3, 2021 11:46
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CAS implementation for Redis.
Raw
redis_cas.js
var LUA_GETS =
'return {'
+ 'redis.call(\'get\', KEYS[1]),'
+ 'redis.call(\'get\', KEYS[1]..\'_ver\')'
+ '}';
var LUA_CAS =
'local ver = redis.call(\'get\', KEYS[1]..\'_ver\') '
+ 'if not ver or ver == KEYS[3] '
+ 'then '
+ 'redis.call(\'incr\', KEYS[1]..\'_ver\') '
+ 'return redis.call(\'set\', KEYS[1], KEYS[2]) '
+ 'else '
+ 'return redis.error_reply(\'LATE\') '
+ 'end';
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