Make messageIDs bytes instead of strings #285
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Rationale: - go-libp2p currently produces non-utf8 strings - making this bytes allows more flexibility in creating message ids, e.g. - random bytes - hashes
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* Initial refactor: replace Rpc.Message with abstract PubsubMessage which is created by pluggable messageFactory. messageFactory replaces messageIdGenerator because of PubsubMessage.messageId property * Convert messageId from String to byte[] (see spec PR: libp2p/specs#285) * Use WBytes ByteArray wrapper instead of plain ByteArray because of equals/hashCode absence * Replace AbstractRouter.seenMessages with a special SeenCache interface which is capable of handling PubsubMessage.messageId in a lazy fashion
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Rationale:
This issue was discovered in libp2p/rust-libp2p#1671 . There is a coresponding issue in go-ipfs-pubsub, libp2p/go-libp2p-pubsub#361
Changing this should have no negative impact. Implementations that expect valid utf-8 strings are already broken, because go-ipfs emits non utf8 strings. See libp2p/go-libp2p-pubsub#361 (comment)