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February 3, 2017 11:42
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Redis script to pop the last element from LIST_KEY that doesn't match SEARCH arg
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| -- pop the last element from LIST_KEY that doesn't match SEARCH arg | |
| local LIST_KEY = KEYS[1] | |
| local SEARCH = ARGV[1] | |
| -- avoid the expensive LRANGE by peeking the last element | |
| local last = redis.call('LINDEX', LIST_KEY, -1) | |
| if not (string.find(last, SEARCH)) then | |
| redis.call('RPOP', LIST_KEY) | |
| return last | |
| end | |
| -- last element is matching -> need to loop though list | |
| local items = redis.call('LRANGE', LIST_KEY, 0, -1) | |
| for i=#items, 1, -1 do | |
| local value = items[i] | |
| if not (string.find(value, SEARCH)) then | |
| redis.call('LREM', LIST_KEY, -1, value) | |
| return value | |
| end | |
| end |
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