I have a question on searching the contract local states by time. For example, I am constructing a smart contract at 3 pm today. Before 4 pm, there are 20 users opting-into the application. At 5 pm, the admin would like to search all local states of the users opted-into the contract before 4 pm. H…

@yfmao , Smart contract doesn’t have the ability to “search” or “scan” accounts for a good reason - performance. Searching is an operation that involves loading large number of accounts into memory and making some tests over that data. Eventually, some “bad actors” would slow down the network perfo…

To complement @tsachi ’s answer, in your case, one simple solution is just to store the round of the opt-in transaction in the local state of the opted-in user.

Thanks for the reply, @fabrice and @tsachi I am now using indexer to search the local state with limitations on application id and round number. I am expecting the results as the local states of the opted-in accounts previous than the input round number in the specified app. But it is showing the…

It’s rather… buried, but you have to pass the -dev-mode flag on the indexer cmd line: daemonCmd.Flags().BoolVarP(&developerMode, "dev-mode", "", false, "allow performance intensive operations like searching for accounts at a particular round")

As @aojjazz explained, you indeed need to enable developer mode to get access to this feature. It’s indeed quite buried. That being said, unfortunately, you will most likely hit another issue: the indexer can only get the local state of applications at the current round. Issue tracking this: back…

Why do you want to keep the SHA256 values in the global state? What extra security property are you trying to achieve? Algorand ensures complete integrity of the local and global state of the smart contract. The only way a local state can be changed is through an approved call to the smart contra…

Not sure of their pricing, etc. but parsiq may be useful as well if you don’t want to wrap it yourself: [image] PARSIQ

Search local states by time

General

yfmao February 10, 2021, 6:43pm 10

Thanks @fabrice and @aojjazz for your reply. I will re-design my smart contract to avoid this problem.

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Search local states by time

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