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0cba803fba
This changes the p2p protocol handlers to delay message decoding. It's the first part of a larger change that will delay decoding all the way through message processing. For responses, we delay the decoding until it is confirmed that the response matches an active request and does not exceed its limits. In order to make this work, all messages have been changed to use rlp.RawList instead of a slice of the decoded item type. For block bodies specifically, the decoding has been delayed all the way until after verification of the response hash. The role of p2p/tracker.Tracker changes significantly in this PR. The Tracker's original purpose was to maintain metrics about requests and responses in the peer-to-peer protocols. Each protocol maintained a single global Tracker instance. As of this change, the Tracker is now always active (regardless of metrics collection), and there is a separate instance of it for each peer. Whenever a response arrives, it is first verified that a request exists for it in the tracker. The tracker is also the place where limits are kept. |
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