Cannot get events from old blocks in case of Infura

[akolotov]

The recent modification in INFURA API could produce the error like the following:

{"jsonrpc":"2.0","id":1,"error":{"code":-32005,"message":"query returned more than 1000 results"}}

if eth_getLogs requests deal with a wide block frame. It could cause an issue when no events could be received if the number of block observed by a watcher was reset to a very old block (e.g. there are already more than 2000 Deposit events on the POA20 Bridge).

Similar issue appeared in the token bridge monitor recently: https://github.com/poanetwork/bridge-monitor/issues/24.

As possible solution it was suggested to use the binary search algorithm to narrow the block range for every request as so several requests will be performed.