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Adrian Catangiu
d01e675fce
For on-demand justifications, peer selection is based on witnessed gossip votes. This commit changes the condition for selecting a peer to request justification for `block` from "last voted on >= `block`" to "peer last voted on strict > `block`". When allowing `>=` we see nodes continuously spamming unsuccessful on-demand requests to nodes which are still voting on a block without having a justification available. One way to fix the spam would be to add some rate-limiting or backoff period when requesting justifications. The other solution (present in this commit) is to simply request justifications from peers that are voting on future blocks so we know they're _guaranteed_ to have the wanted mandatory justification available to send back. Signed-off-by: acatangiu <adrian@parity.io>