e593ae07c4 Bugfix: RPC/blockchain: pruneblockchain: Return the height of the actual last pruned block (Luke Dashjr)
Pull request description:
From 0.14 (2017 Mar) until before 0.19 (2019 Nov), the height of the last block pruned was returned, subject to a bug if there were blocks left unpruned due to sharing files with later blocks.
In #15991, this was "fixed" to the current implementation, introducing a new bug: now, it returns the first *unpruned* block.
Since the user provides the parameter as a block to include in pruning, it makes more sense to fix the behaviour to match the documentation.
~~(Additionally, the description of "pruneheight" in getblockchaininfo is fixed to be technically correct)~~
ACKs for top commit:
fjahr:
utACK e593ae07c4
ryanofsky:
Code review ACK e593ae07c4. Just rebased since last review. Maybe some of the original reviewers of #15991 will want to take a look at this to correct the mistake that was introduced there!
Tree-SHA512: c2d511df80682d57260aae8af1665f9d7eaed16448f185f4c9f23c78fa9b8289a02053da7a0b83643fef57610d601ea63b59ff39661a51f4827f1eb27cc30594
3a9b9bb38e test: ensure createmultisig and addmultisigaddress are not returning any warning for expected cases (brunoerg)
eaf6f630c0 rpc: fix inappropriate warning for address type p2sh-segwit in createmultisig and addmultisigaddress (brunoerg)
Pull request description:
Fixes#25127
If there are any uncompressed keys when calling `AddAndGetMultisigDestination`, it will just default to a legacy address regardless of the chosen `address_type`. So, #23113 added a warnings field which will warn the user why their address format is different.
However, when creating a multisig (p2sh-segwit), it is returning an inappropriate warning, because when getting the output type from destination (`OutputTypeFromDestination`), it returns `ScriptHash` for both legacy and `P2SH_SEGWIT`. So, since `P2SH_SEGWIT` is different from `ScriptHash`, it returns the warning:
192d639a6b/src/rpc/output_script.cpp (L166-L169)
So, to avoid this mistake I changed `OutputTypeFromDestination` to `descriptor->GetOutputType()` to get the appropriate output type.
ACKs for top commit:
jonatack:
ACK 3a9b9bb38e
laanwj:
Code review ACK 3a9b9bb38e
Tree-SHA512: 49f717479c2b8906277e7591ddd4747f7961c2d5c77494b5124045de9036a4277d46b9ad99279d51f0c4484284c445f1e1d3c55c49bbf0716741bad426a89369
From 0.14 (2017 Mar) until before 0.19 (2019 Nov), the height of the last
block pruned was returned, subject to a bug if there were blocks left unpruned
due to sharing files with later blocks.
In #15991, this was "fixed" to the current implementation, introducing a new
bug: now, it returns the first *unpruned* block.
Since the user provides the parameter as a block to include in pruning, it
makes more sense to fix the behaviour to match the documentation.
48262a00f5 Add functional test for block sync from inbound peers (Suhas Daftuar)
0569b5c4bb Sync chain more readily from inbound peers during IBD (Suhas Daftuar)
Pull request description:
When in IBD, if the honest chain is only known by inbound peers, then we must
eventually sync from them in order to learn it. This change allows us to
perform initial headers sync and fetch blocks from inbound peers, if we have no
blocks in flight.
The restriction on having no blocks in flight means that we will naturally
throttle our block downloads to any such inbound peers that we may be
downloading from, until we leave IBD. This is a tradeoff between preferring
outbound peers for most of our block download, versus making sure we always
eventually will get blocks we need that are only known by inbound peers even
during IBD, as otherwise we may be stuck in IBD indefinitely (which could have
cascading failure on the network, if a large fraction of the network managed to
get stuck in IBD).
Note that the test in the second commit fails on master, without the first commit.
ACKs for top commit:
ajtowns:
ACK 48262a00f5
sipa:
ACK 48262a00f5
Tree-SHA512: ffad3a05fa9a32a92226843c9128f52c275e8d51930fde7368badc340227f2ed680561c4c9f2937b4e3bd722474464849ec9b624f912f5e380ce98d71b55764d
1da5e45725 test: use MiniWallet for feature_dbcrash.py (Sebastian Falbesoner)
Pull request description:
This PR enables one more of the non-wallet functional tests (feature_dbcrash.py) to be run even with the Bitcoin Code wallet by using the MiniWallet instead, as proposed in https://github.com/bitcoin/bitcoin/issues/20078.
ACKs for top commit:
laanwj:
Code review ACK 1da5e45725
brunoerg:
crACK 1da5e45725
Tree-SHA512: 75ee9a32fd1451254004797d695d18032bd0fcb66ebd88cf737e147e43812525f6e884ec05fcc4f76f566dc71174c8ed7347bcdce16567db6511746ae64cead0
f565b2836d Fixup option name in bench message (Ben Woosley)
bf209ac7a7 doc: Fix spelling errors identified by codespell in coments (Ben Woosley)
Pull request description:
From the output [here](https://cirrus-ci.com/task/5275612980969472?logs=lint#L849):
```
src/qt/test/addressbooktests.cpp:185: wilcard ==> wildcard
src/qt/test/addressbooktests.cpp:191: wilcard ==> wildcard
src/test/miniscript_tests.cpp:227: nd ==> and, 2nd
src/test/versionbits_tests.cpp:260: everytime ==> every time
src/util/time.h:89: precicion ==> precision
src/util/time.h:90: precicion ==> precision
^ Warning: codespell identified likely spelling errors. Any false positives? Add them to the list of ignored words in test/lint/spelling.ignore-words.txt
```
~~I left the 'nd' in miniscript_tests as-is, as it's valid miniscript,
and I'm wary of whitelisting it.~~
ACKs for top commit:
dunxen:
ACK f565b28
Tree-SHA512: 501a426c5f6f9761e2c8f980d5d955611428a827321888f53e0ae9526b0fecd43f9d1fa845fc70ae2489d77be6dc0b5b371dff55c5146f4b39ed874f4a1ea917
a35f963edf Add test for getheaders behavior (Suhas Daftuar)
ef6dbe6863 Respond to getheaders if we have sufficient chainwork (Suhas Daftuar)
Pull request description:
Previously, we would check to see if we were in IBD and ignore getheaders requests accordingly. However, the IBD criteria -- an optimization mostly targeted at behavior when we have peers serving us many blocks we need to download -- is difficult to reason about in edge-case scenarios, such as if the network were to go a long time without any blocks found and nodes are getting restarted during that time.
To make things simpler to reason about, just use `nMinimumChainWork` as our anti-DoS threshold for responding to a getheaders request; as long as our chain has that much work, it should be fine to respond to a peer asking for our headers (and this should allow such a peer to request blocks from us if needed).
ACKs for top commit:
klementtan:
crACK a35f963edf
naumenkogs:
ACK a35f963edf
MarcoFalke:
review ACK a35f963edf 🗯
Tree-SHA512: 131e3872e7fe80382ea9c1ec202d6c2dc59c006355c69000aa3f4ce6bccd02a6c689c8cb8f3542b5d9bc48bfa61edcbd1a78535c0b79018971d02bed2655d284
e8959000b6 test: Use MiniWallet in rpc_rawtransaction.py (Daniela Brozzoni)
e93046c10b MOVEONLY: Move signrawtransactionwithwallet test (Daniela Brozzoni)
Pull request description:
This PR allows `rpc_rawtransaction.py` to be run even without the Core wallet by using the MiniWallet instead, as proposed in https://github.com/bitcoin/bitcoin/issues/20078.
This test was previously run twice, once with `--legacy-wallet` and once with
`--descriptors`. Since this would have meant running the same test twice
if the wallet wasn't compiled, now we run it just once with the legacy
wallet.
ACKs for top commit:
jonatack:
ACK e8959000b6
Tree-SHA512: d1580570a54dad8e30a5df1ab7d03ecb3f824efe6843323e1f3aef63592045d823c7d54fc86321dc7c1d414854a253431a01a7baa9f30426ea9a09ef11ae3a04
This test was previously run twice, once with `--legacy-wallet` and once with
`--descriptors`.
Now we run it only with `--legacy-wallet`, as all the tests has been
ported to the MiniWallet but `raw_multisig_transaction_legacy_tests`,
which can be run only with the legacy wallet.
We also decrease the number of nodes used from 4 to 3, making the test
run slightly faster.
Put signrawtransactionwithwallet_tests in rpc_signrawtransaction.py,
as the test is mainly testing the signrawtransaction RPC.
Review with `git show --color-moved=dimmed-zebra`
4185570340 Add RPC to get mempool txs spending outputs (t-bast)
Pull request description:
We add an RPC to fetch mempool transactions spending any of the given outpoints.
Without this RPC, application developers need to first call `getrawmempool` which returns a long list of `txid`, then fetch each of these transactions individually (`getrawtransaction`) to check whether they spend the given outpoints, which wastes a lot of bandwidth (in the worst case we need to transfer the whole mempool).
For example in lightning, when we discover that one of our channel funding transactions has been spent, we need to find the spending transaction to claim our outputs from it. We are currently forced to fetch the whole mempool to do the analysis ourselves, which is quite costly.
I believe that this RPC is also generally useful when doing some introspection on your mempool after one of your transactions failed to broadcast, for example when you implement RBF at the application level. Fetching and analyzing the conflicting transaction gives you more information to successfully replace it.
ACKs for top commit:
darosior:
re-utACK 4185570340
vincenzopalazzo:
re-ACK 4185570340
danielabrozzoni:
re-tACK 4185570340
w0xlt:
reACK 4185570340
Tree-SHA512: 206687efb720308b7e0b6cf16dd0a994006c0b5a290c8eb386917a80130973a6356d0d5cae1c63a01bb29e066dd721594969db106cba7249214fcac90d2c3dbc
295ff61934 test: add coverage for unknown -blockfilterindex (brunoerg)
Pull request description:
This PR adds test coverage for the following init error:
44037a2912/src/init.cpp (L844)
Passing an unknown value to -blockfilterindex should throw an error.
ACKs for top commit:
dunxen:
cr-ACK 295ff61
Tree-SHA512: 1444903cf0696406c485ce0575f951d527fe7d699094d5845622c0b57c954d6d7dcf1e78ef0c4e8b9b26f53b79583f07fec0e8d8e7f04aa744d2a8cd98329db9
From the output here:
src/qt/test/addressbooktests.cpp:185: wilcard ==> wildcard
src/qt/test/addressbooktests.cpp:191: wilcard ==> wildcard
src/test/miniscript_tests.cpp:227: nd ==> and, 2nd
src/test/versionbits_tests.cpp:260: everytime ==> every time
src/util/time.h:89: precicion ==> precision
src/util/time.h:90: precicion ==> precision
^ Warning: codespell identified likely spelling errors. Any false positives? Add them to the list of ignored words in test/lint/spelling.ignore-words.txt
https://cirrus-ci.com/task/5275612980969472?logs=lint#L849
I added 'nd' to the spelling.ignored-words.txt, as it's valid miniscript.
664a14ba7c coinstats: Move GetUTXOStats to rpc/blockchain (Carl Dong)
f100687566 kernel: Use ComputeUTXOStats in validation (Carl Dong)
faa52387e8 style-only: Rearrange using decls after scripted-diff (Carl Dong)
f329a9298c scripted-diff: Move src/kernel/coinstats to kernel:: (Carl Dong)
0e54456f04 Use only kernel/coinstats.h in index/coinstatsindex.h (Carl Dong)
80970985c9 coinstats: Split node/coinstats.h to kernel/coinstats.h (Carl Dong)
35f73ce4b2 coinstats: Move hasher codepath to kernel/coinstats (Carl Dong)
b7634fe02b Move logic from LookupUTXOStatsWithIndex to CoinStatsIndex::LookUpStats (Carl Dong)
1352e410a5 coinstats: Separate hasher/index lookup codepaths (Carl Dong)
524463daf6 coinstats: Return purely out-param CCoinsStats (Carl Dong)
46eb9fc56a coinstats: Extract index_requested in-member to in-param (Carl Dong)
a789f3f2b8 coinstats: Extract hash_type in-member to in-param (Carl Dong)
102294898d includes: Remove rpc/util.h -> node/coinstats.h (Carl Dong)
0848db9c35 fuzz: Remove useless GetUTXOStats fuzz case (Carl Dong)
52b1939993 kernel: Remove unnecessary blockfilter{index,}.cpp (Carl Dong)
Pull request description:
Part of: #24303
Depends on: #24322
The `GetUTXOStats` function has 2 codepaths:
- One which queries the `CoinStatsIndex` for the UTXO hash
- One which actually performs the hashing
For `libbitcoinkernel`, the only place where we call `GetUTXOStats` is in `PopulateAndValidateSnapshots`, which uses the `SHA256D` hash, and is therefore unable to use the `CoinStatsIndex` since that only provides `MuHash` hashes. Not that I think indices necessarily belong in `libbitcoinkernel` anyway.
This PR separates these 2 aforementioned codepaths of `GetUTXOStats`, uses the hashing codepath in `PopulateAndValidateSnapshots`, and removes the need to link in `index/coinstatsindex.cpp` and `node/coinstats.cpp`.
-----
Logistically, this PR:
- Extracts out the `index_requested` and `hash_type` members of `CoinStats`, which served as "in-params" to `GetUTXOStats` embedded within the `CoinStats` struct. This allows `CoinStats` to only consist of "out-param" members, and be returned by `GetUTXOStats` without needing to be an "in-out" param
- Introduce the purely virtual `UTXOHashers` class, with 3 implementations: `SHA256DHasher`, `MuHashHasher`, and `NullHasher`. These replace the existing template-based polymorphism.
- Split `GetUTXOStats` into:
- `CalculateUTXOStatsWithHasher(UTXOHasher&, ...)`, and
- `LookupUTXOStatsWithIndex(CoinStatsIndex&, ...)`
- Use `CalculateUTXOStatsWithHasher` directly where appropriate (`src/validation.cpp` and `src/fuzz`)
- Move `GetUTXOStats` to `rpc/blockchain`, which is the only place that depends on `GetUTXOStats`'s weird fallback behaviour
- Move `LookupUTXOStatsWithIndex` to `index/coinstatsindex`
Code organization:
- `src/`
- `kernel/` → only contains the hashing codepath
- `coinstats.cpp` → hashing codepath implementations
- `coinstats.h` → header for `kernel/coinstats.cpp`
- `index/` → only contains the index codepath
- `coinstatsindex.cpp` → index codepath implementations
- `coinstatsindex.h`
- `validation.cpp` → only uses the hashing codepath
- `rpc/blockchain.cpp` → uses both the hashing and index codepath, old `GetUTXOStats` fallback logic moved here as static
- `test/fuzz/coins_view.cpp` → only uses the hashing codepath
TODOs:
- [x] Commit messages could be fleshed out more
Would love any feedback!
ACKs for top commit:
laanwj:
Code review ACK 664a14ba7c
Tree-SHA512: 18722c7bd279174d2d1881fec33ea04a9b261aae1c12e998cf434ef297d8ded47de69c526c8033a2ba7abc93ba3d2ff5faf4ce05e8888c725c31cf885ce3ef73
This is the "fruit of our labor" for this patchset.
ChainstateManager::PopulateAndValidateSnapshot can now directly call
ComputeUTXOStats(...).
Our consensus engine is now fully decoupled from all indices.
See the src/Makefile.am for some satisfying removals.
908fb7e2ec test: Use permissions from git in `lint-files.py` (laanwj)
48d2e80a74 test: Don't use shell=True in `lint-files.py` (laanwj)
Pull request description:
Improvements to the `lint-files.py` script:
- Avoid use of `shell=True`.
- Check the permissions in git's metadata instead of in the filesystem. This stops the umask or filesystem from interfering. It's also more efficient as it only needs a single call to `git ls-files`.
(what triggered this change was `File "..." contains a shebang line, but has the file permission 775 instead of the expected executable permission 755.` errors running the script locally).
ACKs for top commit:
vincenzopalazzo:
re-tACK 908fb7e2ec
Tree-SHA512: 2eaf868c55a9c3508b12658a5b3ac429963fd0551e645332d0ac54be56fefccee95115e4667386df24b46b545593cb0d0bf8c6cecab73f9cb19d37ddf704c614
baa3ddc49c doc: add release notes about `getreceivedbylabel` returning an error if the label is not in the address book. (furszy)
8897a21658 rpc: getreceivedbylabel, don't loop over the entire wallet txs map if no destinations were found for the input label. (furszy)
Pull request description:
Built on top of #23662, coming from comment https://github.com/bitcoin/bitcoin/pull/23662#pullrequestreview-971407999.
If `wallet.GetLabelAddresses()` returns an empty vector (the wallet does not have stored destinations with that label in the addressbook) or if none of the returned destinations are from the wallet, we can return the function right away.
Otherwise, we are walking through all the wallet txs + outputs for no reason (`output_scripts` is empty).
ACKs for top commit:
achow101:
ACK baa3ddc49c
theStack:
re-ACK baa3ddc49c
w0xlt:
ACK baa3ddc49c
Tree-SHA512: 00e10365b179bf008da2f3ef8fbb3ee04a330426374020e3f2d0151b16991baba4ef2b944e4659452f3e4d6cb20f128d0918ddf0453933a25a4d9fd8414a1911
If wallet.GetLabelAddresses() returns an empty vector (the wallet does not have addresses with that label in the addressbook) or if none of the returned destinations are from the wallet, we can return the function right away.
a4703ce9d7 doc: add release notes about removal of the `deprecatedrpc=exclude_coinbase` (Sebastian Falbesoner)
ef0aa74836 rpc: wallet: remove `-deprecatedrpc=exclude_coinbase` logic (Sebastian Falbesoner)
Pull request description:
Including coinbase transactions in `receivedby` RPCs and adding the `-deprecatedrpc=exclude_coinbase` was done in PR #14707 (released in v23.0). For the next release v24.0, this configuration option can be removed.
ACKs for top commit:
fanquake:
ACK a4703ce9d7
Tree-SHA512: 97cd4e78501e64f678c78d2ebb5be5376688c023e34fced71dd24e432d27aa31a74b5483545f49ba0bdf48656d8b8b7bee74e3db26cf6daf112613f1caa4dfa4
1d4122dfef init: Allow -proxy="" setting values (Ryan Ofsky)
Pull request description:
This drops the `No proxy server specified. Use -proxy=<ip> or -proxy=<ip:port>` error when a empty `-proxy=` command line argument, `bitcoin.conf` value, or `settings.json` value is specified, and just makes bitcoin connect and listen normally in these cases.
The error was originally added in https://github.com/bitcoin/bitcoin/pull/20003 to prevent a bare `-proxy` command line argument with no assignment from clearing proxy settings. But it was implemented in an overbroad way breaking empty `-proxy=` assignments as well.
The motivation for this change is to prevent a GUI bug that happens with https://github.com/bitcoin/bitcoin/pull/15936, reported in https://github.com/bitcoin/bitcoin/pull/15936#pullrequestreview-937685759 by vasild, that happens after a proxy setting is enabled and disabled in the GUI. But this change also makes sense on its own to remove a potentially confusing error message.
ACKs for top commit:
hebasto:
re-ACK 1d4122dfef, only rebased since my recent [review](https://github.com/bitcoin/bitcoin/pull/24830#pullrequestreview-941255672).
Tree-SHA512: 753adfce199ed078a6cd9e0ea78e76c0b14070f8fcfe2a4632cd0c6dfe6b4e135ddffbe11a97e5e30520ea9e5bda00bad1493cbaef74cf425aa8613249167f53
055d94d1ab test: add coverage for unknown network in -onlynet (brunoerg)
Pull request description:
This PR adds test coverage for the following init error by passing an unknown network in -onlynet
0de36941ec/src/init.cpp (L1311)
ACKs for top commit:
MarcoFalke:
rACK 055d94d1ab
Tree-SHA512: 01bbb297afff371f6345889fa04117ff195b68f0bbf934878ba446049791fdbd7d2ce119ee4f9b3616cc0a81330d7055507dc81151acf68532c077f3575258e9
bf6526f4a0 [test] Remove segwit argument from build_block_on_tip() (John Newbery)
c65bf50b44 Remove fUseWTXID parameter from CBlockHeaderAndShortTxIDs constructor (John Newbery)
Pull request description:
This implements two of the suggestions from code reviews of PR 20799:
- Remove fUseWTXID parameter from CBlockHeaderAndShortTxIDs constructor
- Remove segwit argument from build_block_on_tip()
ACKs for top commit:
dergoegge:
Code review ACK bf6526f4a0
naumenkogs:
ACK bf6526f4a0
Tree-SHA512: d553791d1364b9e655183755e829b195c9b47f59c62371dbae49d9c0f8d84fec58cf18f4dde89591672ef5658e18c9cf0206c2efd70606980f87e506bc3bd4e5
5dc6d92077 test: make BIP157 messages default-constructible (MESSAGEMAP compatibility) (Sebastian Falbesoner)
71e4cfefe7 test: p2p: add missing BIP157 message types to MESSAGEMAP (Sebastian Falbesoner)
Pull request description:
The script [message-capture-parser.py](https://github.com/bitcoin/bitcoin/blob/master/contrib/message-capture/message-capture-parser.py) currently doesn't support parsing the BIP157 messages `getcfilters`, `getcfheaders` and `getcfcheckpt`, e.g.
```
$ ./contrib/message-capture/message-capture-parser.py msgs_recv.dat
...
WARNING - Unrecognized message type b'getcfcheckpt' in /home/thestack/bitcoin/msgs_recv.dat
...
```
This PR fixes this by adding the missing message type mappings to the [`MESSAGEMAP`](225e5b57b2/test/functional/test_framework/p2p.py (L95-L127)) in the test framework and add default-constructors for the corresponding `msg_`... classes.
Without the second commit, the following error message would occur:
```
File "/home/thestack/bitcoin/./contrib/message-capture/message-capture-parser.py", line 141, in process_file
msg = MESSAGEMAP[msgtype]()
TypeError: __init__() missing 2 required positional arguments: 'filter_type' and 'stop_hash'
```
ACKs for top commit:
dunxen:
tACK [5dc6d92](5dc6d92077)
Tree-SHA512: d656c4d38a856373f01d7c293ae7d2b27378a9fc248048ebf2a64725ef8b498b3ddf4f420704abdb20d0c68ca548f1777602c5e73b66821a20c97ae618f1d63f
faac67cab0 test: Fix intermittent race in p2p_unrequested_blocks.py (MacroFake)
Pull request description:
Disconnect may also result in an `OSError`, not only an `AssertionError`. Instead of maintaining a dead code path and enumerating disconnect reasons, just assume disconnection happens every time.
ACKs for top commit:
jamesob:
Code review ACK faac67cab0
Tree-SHA512: d2cec003168e421a5faed275cb2e1ef9fc63f9e8514f41d21da17e8964c79e5b453ccd72cd7ec62805f45293cf877be5bc8124ae98a515c0aa42d6e053409653
The only place that segwit=True is for a block that contains only the
coinbase transaction. Since the witness commitment is optional if none
of the transactions have a witness, we can leave it out. This doesn't
change the test coverage, which is testing p2p compact block logic.
Suggested in https://github.com/bitcoin/bitcoin/pull/20799#discussion_r867782119
ada8358ef5 Sanitize port in `addpeeraddress()` (amadeuszpawlik)
Pull request description:
In connection to #22087, it has been [pointed out](https://github.com/bitcoin/bitcoin/pull/22087#pullrequestreview-674786285) that `addpeeraddress` needs to get its port-value sanitized.
ACKs for top commit:
fanquake:
ACK ada8358ef5
Tree-SHA512: 48771cd4f6940aa7840fa23488565c09dea86bd5ec5a5a1fc0374afb4857aebcd2a1f51e2d4cb7348460e0ad9793dc5d2962df457084ed2b8d8142cae650003f
Subsequent commits will remove support for other versions of compact blocks.
Add a test that a received `sendcmpct` message with version = 1 is
ignored.
4faa550072 test: Fix race condition in index pruning test (Fabian Jahr)
Pull request description:
Fixes#25031
The `feature_index_prune.py` test seems to be racy because connections are reestablished after restarts and the blocks are synced via the `sync_blocks` function. The `sync_blocks` function has a sanity check at the beginning to check that all nodes in the set have at least one established connection and that is not always the case.
As a solution nodes are not connected via the `-connect` parameter on start but instead via the `connect_nodes` helper.
Top commit has no ACKs.
Tree-SHA512: f88377715f455f1620725fe8ebd6b486fa0209660b193bf68d1ce1452e2086ac5d169d8ca4c2b61443566232e96fb9c6386ee482bc546cce38078d72e7c3c29f
Nodes are restarted and reconnected as part of the test. Afterwards
`sync_blocks` is called immediately on the nodes. `sync_blocks`
first checks that all the included nodes have at least one
connection. Since adding a connection is usually happening in a
thread, sometimes nodes could run into this check before the
connection was fully established so that it would fail the entire
test.
This fix uses the `connect_nodes` helper to make the connection the
nodes. `connect_nodes` has a wait for the connection built into it.
In order to deserialize received or read messages via lookup in
MESSAGEMAP (e.g.: `t = MESSAGEMAP[msgtype]()`), the messages must have a
default constructor, i.e. there needs to be the possibility to
initialize them with zero arguments.
