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 IIUC, upon a new event, strfry sends data to the plugin on stdin, the plugin executes once and then reports back on stdout. So then, how is the rate limiting sources persisted between notes?  
 not sure what you mean. why would it be persisted between nodes, which nodes? 
 Not "noDes" but noTes. When strfry sees a new note, it sends it to the plugin you specify in the config over stdin. The plugin executes and responds back over stdout. In other words, unless you write to file, the Map that holds track of the sources will not be persisted for the next note (or the next execution of the script). The sources I refer to is this: https://github.com/damus-io/noteguard/blob/master/src/filters/rate_limit.rs#L16 
 Maybe I haven't had enough coffee yet, idk 😂 
 Lol i just woke up my brain is still booting. I should coffee before I nostr 
 Maybe your brain is dual-booting two different OS simultaneously? 
 strfry doesn’t spawn the plugin once per note, it spawns it once and streams notes to it via stdin/stdout 
 oh, TIL. Then it makes a lot more sense