If our tip hasn't updated in a while, that may be because our peers are
not relaying blocks to us that we would consider valid. Allow connection
to an additional outbound peer in that circumstance.
Also, periodically check to see if we are exceeding our target number of
outbound peers, and disconnect the one which has least recently
announced a new block to us (choosing the newest such peer in the case
of tie).
Github-Pull: #11560
Rebased-From: ac7b37cd2bd612a64a4009ba82f1cd1d57f37434
There is no reason to wish to store blocks on disk always just
because a peer is whitelisted. This appears to be a historical
quirk to avoid breaking things when the accept limits were added.
Github-Pull: #11531
Rebased-From: 3d9c70ca0fd5d42f31114b689714af1825f0ed30
Reading the variable mapBlockIndex requires holding the mutex cs_main.
The new "Disconnect outbound peers relaying invalid headers" code
added in commit 37886d5e2f9992678dea4b1bd893f4f10d61d3ad and merged
as part of #11568 two days ago did not lock cs_main prior to accessing
mapBlockIndex.
Github-Pull: #11578
Rebased-From: 2530bf27b72e53cc6ffec27de35f3b487984833d
ProcessMessages will now return earlier when processing headers
messages, rather than continuing on (and do nothing).
Github-Pull: #11568
Rebased-From: 4637f18522429473e68f6f512a03040e121a446d
Currently we have no rotation of outbound peers. If an outbound peer
stops serving us blocks, or is on a consensus-incompatible chain with
less work than our tip (but otherwise valid headers), then we will never
disconnect that peer, even though that peer is using one of our 8
outbound connection slots. Because we rely on our outbound peers to
find an honest node in order to reach consensus, allowing an
incompatible peer to occupy one of those slots is undesirable,
particularly if it is possible for all such slots to be occupied by such
peers.
Protect against this by always checking to see if a peer's best known
block has less work than our tip, and if so, set a 20 minute timeout --
if the peer is still not known to have caught up to a chain with as much
work as ours after 20 minutes, then send a single getheaders message,
wait 2 more minutes, and if a better header hasn't been received by then,
disconnect that peer.
Note:
- we do not require that our peer sync to the same tip as ours, just an
equal or greater work tip. (Doing otherwise would risk partitioning the
network in the event of a chain split, and is also unnecessary.)
- we pick 4 of our outbound peers and do not subject them to this logic,
to be more conservative. We don't wish to permit temporary network
issues (or an attacker) to excessively disrupt network topology.
Github-Pull: #11490
Rebased-From: 5a6d00c6defc587e22c93e63029fdd538ce8858d
When in IBD, we'd like to use all our outbound peers to help us
sync the chain. Disconnect any outbound peers whose headers have
insufficient work.
Github-Pull: #11490
Rebased-From: c60fd71a65e841efe187992f46c583a704cc37f5
Drop boost signals in favor of a stateful class. This will allow the message
processing loop to actually move to net_processing in a future step.
Github-Pull: #10756
Rebased-From: 8ad663c1fa88d68843e45580deced56112343183
There are a few too many edge-cases here to make this a scripted diff.
The following commits will move a few functions into PeerLogicValidation, where
the local connman instance can be used. This change prepares for that usage.
Github-Pull: #10756
Rebased-From: 28f11e9406b185dc87144f1f29af0d93eb115b4e
90d4d89 scripted-diff: Use the C++11 keyword nullptr to denote the pointer literal instead of the macro NULL (practicalswift)
Pull request description:
Since C++11 the macro `NULL` may be:
* an integer literal with value zero, or
* a prvalue of type `std::nullptr_t`
By using the C++11 keyword `nullptr` we are guaranteed a prvalue of type `std::nullptr_t`.
For a more thorough discussion, see "A name for the null pointer: nullptr" (Sutter &
Stroustrup), http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf
With this patch applied there are no `NULL` macro usages left in the repo:
```
$ git grep NULL -- "*.cpp" "*.h" | egrep -v '(/univalue/|/secp256k1/|/leveldb/|_NULL|NULLDUMMY|torcontrol.*NULL|NULL cert)' | wc -l
0
```
The road towards `nullptr` (C++11) is split into two PRs:
* `NULL` → `nullptr` is handled in PR #10483 (scripted, this PR)
* `0` → `nullptr` is handled in PR #10645 (manual)
Tree-SHA512: 3c395d66f2ad724a8e6fed74b93634de8bfc0c0eafac94e64e5194c939499fefd6e68f047de3083ad0b4eff37df9a8a3a76349aa17d55eabbd8e0412f140a297
3f8fa7f Make sure to clean up mapBlockSource if we've already seen the block (Cory Fields)
Pull request description:
Otherwise we may leave them dangling.
Credit TheBlueMatt.
Tree-SHA512: 8be77e08ebfc4f5b206d5ee7cfbe87f92c1eb5bc2b412471993658fe210306789aaf0f3d1454c635508a7d8effede2cf5ac144d622b0157b872733d9661d65c3
5a9b508 [trivial] Add end of namespace comments (practicalswift)
Tree-SHA512: 92b0fcae4d1d3f4da9e97569ae84ef2d6e09625a5815cd0e5f0eb6dd2ecba9852fa85c184c5ae9de5117050330ce995e9867b451fa8cd5512169025990541a2b
At startup, we choose one peer to serve us the headers chain, until
our best header is close to caught up. Disconnect this peer if more
than 15 minutes + 1ms/expected_header passes and our best header
is still more than 1 day away from current time.
This patch makes several related changes:
* Changes the CCoinsView virtual methods (GetCoins, HaveCoins, ...)
to be COutPoint/Coin-based rather than txid/CCoins-based.
* Changes the chainstate db to a new incompatible format that is also
COutPoint/Coin based.
* Implements reconstruction code for hash_serialized_2.
* Adapts the coins_tests unit tests (thanks to Russell Yanofsky).
A side effect of the new CCoinsView model is that we can no longer
use the (unreliable) test for transaction outputs in the UTXO set
to determine whether we already have a particular transaction.
0f3471f net: make CNode's id private (Cory Fields)
9ff0a51 scripted-diff: net: Use accessor rather than node's id directly (Cory Fields)
e50c33e devtools: add script to verify scriptable changes (Cory Fields)
Tree-SHA512: a0ff50f4e1d38a2b63109b4996546c91b3e02e00d92c0bf04f48792948f78b1f6d9227a15d25c823fd4723a0277fc6a32c2c1287c7abbb7e50fd82ffb0f8d994
vToFetch is never used after declaration. When checked if not empty,
evaluation is always false. Best case scenario this is optimized by the
compiler, worst case it wastes cpu cycles. It should be removed either
way.
b49ad44 Add comment about cs_most_recent_block coverage (Matt Corallo)
c47f5b7 Cache witness-enabled state with recent-compact-block-cache (Matt Corallo)
efc135f Use cached [compact] blocks to respond to getdata messages (Matt Corallo)
Tree-SHA512: ffc478bddbf14b8ed304a3041f47746520ce545bdeffa9652eff2ccb25c8b0d5194abe72568c10f9c1b246ee361176ba217767af834752a2ca7263d292005e87
b1a6d4c Take a CTransactionRef in AddToWalletIfInvolvingMe to avoid a copy (Matt Corallo)
1c95e2f Use std::shared_ptr instead of boost::shared_ptr in ScriptForMining (Matt Corallo)
91f1e6c Remove dead-code tracking of requests for blocks we generated (Matt Corallo)
acad82f Add override to functions using CValidationInterface methods (Matt Corallo)
e6d5e6c Hold cs_wallet for whole block [dis]connection processing (Matt Corallo)
461e49f SyncTransaction->TxAddedToMempool/BlockConnected/Disconnected (Matt Corallo)
f404334 Handle SyncTransaction in ActivateBestChain instead of ConnectTrace (Matt Corallo)
a147687 Keep conflictedTxs in ConnectTrace per-block (Matt Corallo)
d3167ba Handle conflicted transactions directly in ConnectTrace (Matt Corallo)
29e6e23 Make ConnectTrace::blocksConnected private, hide behind accessors (Matt Corallo)
822000c Add pblock to connectTrace at the end of ConnectTip, not start (Matt Corallo)
f5e9a01 Include missing #include in zmqnotificationinterface.h (Matt Corallo)
Tree-SHA512: 8893d47559da3b28d2ef7359768547cba8a4b43b6f891d80f5848f995a84b1517bfb0f706fdc8cd43f09a1350349eb440d9724a59363ab517dfcc4fcb31b2018
