Official Go implementation of the Ethereum protocol

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Martin Holst Swende db03faa10d core, eth: improve delivery speed on header requests (#23105) ... This PR reduces the amount of work we do when answering header queries, e.g. when a peer is syncing from us. For some items, e.g block bodies, when we read the rlp-data from database, we plug it directly into the response package. We didn't do that for headers, but instead read headers-rlp, decode to types.Header, and re-encode to rlp. This PR changes that to keep it in RLP-form as much as possible. When a node is syncing from us, it typically requests 192 contiguous headers. On master it has the following effect: - For headers not in ancient: 2 db lookups. One for translating hash->number (even though the request is by number), and another for reading by hash (this latter one is sometimes cached). - For headers in ancient: 1 file lookup/syscall for translating hash->number (even though the request is by number), and another for reading the header itself. After this, it also performes a hashing of the header, to ensure that the hash is what it expected. In this PR, I instead move the logic for "give me a sequence of blocks" into the lower layers, where the database can determine how and what to read from leveldb and/or ancients. There are basically four types of requests; three of them are improved this way. The fourth, by hash going backwards, is more tricky to optimize. However, since we know that the gap is 0, we can look up by the parentHash, and stlil shave off all the number->hash lookups. The gapped collection can be optimized similarly, as a follow-up, at least in three out of four cases. Co-authored-by: Felix Lange <fjl@twurst.com>		3 years ago
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api.go	all: remove redundant conversions and import names (#21903)	4 years ago
downloader.go	core, eth, les, trie: remove the sync bloom, used by fast sync	3 years ago
downloader_test.go	core, eth: improve delivery speed on header requests (#23105)	3 years ago
events.go	cmd,eth: 16400 Add an option to stop geth once in sync. WIP for light mode (#17321)	6 years ago
fetchers.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
fetchers_concurrent.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago
fetchers_concurrent_bodies.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
fetchers_concurrent_headers.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
fetchers_concurrent_receipts.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
metrics.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago
modes.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago
peer.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago
queue.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
queue_test.go	eth: pre-process downloader responses on the peer reader thread	3 years ago
resultstore.go	eth/downloader: refactor downloader + queue (#21263)	4 years ago
statesync.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago
testchain_test.go	eth: request id dispatcher and direct req/reply APIs (#23576)	3 years ago