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Cannot get events from old blocks in case of Infura #144

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@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: omni/bridge-monitor#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.

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