Squashed from the following commits:

core/state: lazily init snapshot storage map
core/state: fix flawed meter on storage reads
core/state: make statedb/stateobjects reuse a hasher
core/blockchain, core/state: implement new trie prefetcher
core: make trie prefetcher deliver tries to statedb
core/state: refactor trie_prefetcher, export storage tries
blockchain: re-enable the next-block-prefetcher
state: remove panics in trie prefetcher
core/state/trie_prefetcher: address some review concerns

sq

* deps: use improved bloom filter implementation

* eth/handler, trie: use 4 keys for syncbloom + minor fixes

* eth/protocols, trie: revert change on syncbloom method signature

Resolves https://github.com/etclabscore/core-geth/issues/273

jsre.JSRE already handles establishing preload
file paths relative to the 'assets' path (aka docroot),
where it joins the assets dir and the file path if relative,
or uses the file path only if absolute.

The duplication of this logic by MakeConsolePreloads
caused preloaded files to have paths which contained
duplicate references to the assets dir path.

Date: 2020-12-30 08:25:01-06:00
Signed-off-by: meows <b5c6@protonmail.com>

This changes the chainID RPC method to return an error when EIP-155 is not yet
active at the current block height. It used to simply return zero in this case, but
that's confusing.

* eth: fixed typos

* eth: fixed log message

common/prque: pull in tests and benchmarks from upstream

* core: persist bad blocks

* core, eth, internal: address comments

* core/rawdb: add badblocks to inspector

* core, eth: update

* internal: revert

* core, eth: only save 10 bad blocks

* core/rawdb: address comments

* core/rawdb: fix

* core: address comments

* downloader: fix race condition in tests

* eth/downloader: fix race condition in tests

* Revert "downloader: fix race condition in tests"

This reverts commit 108033ebc6985de83791d375b6e6647a77d28d5a.

This commit extends the ethclient test suite and increases code coverage of the ethclient
package from ~15% to >55%. These tests act as early smoke tests to signal issues in the
RPC-interface. E.g. if a functionality like eth_chainId or eth_call breaks, the test
will break.

* cmd/faucet: avoid encoding for each client

* cmd/faucet: fix flaw in clearing of txs, avoid sending more than necessary

* cmd/faucet: fix flaw in tx cropping

* cmd/faucet: revert change to not always send tx info

* cmd/faucet: review fixes

* cmd/faucet: revert #22018, fix order in UI

* cmd/faucet: fix lock error

* cmd/faucet: revert json changes

* squashme

cmd/faucet: switch Facebook auth over to mobile site

* eth/protocols/snap: speed up hash checks

* eth/protocols/snap: nit fix
Co-authored-by: Péter Szilágyi <peterke@gmail.com>

cmd/faucet: fix websocket race regression after switching to gorilla

* eth/protocols/snap: reschedule missed deliveries

* eth/protocols/snap: clarify log message

* eth/protocols/snap: revert failures async and update runloop
Co-authored-by: Péter Szilágyi <peterke@gmail.com>

cmd/utils, eth/downloader: minor snap nitpicks

* estimateGas, cumulativeGas
* linted
* add test for estimateGas

* crypto/bls12381: fixed ineffectual assignment

* crypto/signify: fix ineffectual assignment

Solidity 0.8.0 changes the way that output is marshalled. This patch allows to parse both
the legacy format used previously and the new format.

See also https://docs.soliditylang.org/en/breaking/080-breaking-changes.html#interface-changes

* cmd/geth: added --mainnet flag

* cmd/utils: set default genesis if --mainnet is specified

* cmd/utils: addressed comments

This changes the JSON encoding of blocks returned by the API
to have decimal instead of hexadecimal numbers. The spec wants
it this way.
Co-authored-by: Martin Holst Swende <martin@swende.se>

This PR removes a logic in the miner, which was originally intended to help temporary testnets based on ethash from "running off into the future". If the difficulty was low, and a few computers started mining several blocks per second, the ethash rules (which demand 1s delay between blocks) would push the blocktimes further and further away.
The solution was to make the miner sleep while this happened.

Nowadays, this problem is solved instead by PoA chains, and it's recommended to let testnets and devnets be based on clique instead. The existing logic is problematic, since it can cause stalls within the miner making it difficult for remote workers to submit work if the channel is blocked on a sleep.

Credits to Saar Tochner for reporting this via the bug bounty

cmd: support v1.1 Twitter API in faucet, fix puppeth

Add links to go-ethereum's GitHub release page.
Co-authored-by: Felix Lange <fjl@twurst.com>

closes #22049