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b3a9a4d add a quick early out to get_blocks.bin when up to date (moneromooo-monero)
2899379 daemon, wallet: new pay for RPC use system (moneromooo-monero)
ffa4602 simplewallet: add public_nodes command (moneromooo-monero)
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Daemons intended for public use can be set up to require payment
in the form of hashes in exchange for RPC service. This enables
public daemons to receive payment for their work over a large
number of calls. This system behaves similarly to a pool, so
payment takes the form of valid blocks every so often, yielding
a large one off payment, rather than constant micropayments.
This system can also be used by third parties as a "paywall"
layer, where users of a service can pay for use by mining Monero
to the service provider's address. An example of this for web
site access is Primo, a Monero mining based website "paywall":
https://github.com/selene-kovri/primo
This has some advantages:
- incentive to run a node providing RPC services, thereby promoting the availability of third party nodes for those who can't run their own
- incentive to run your own node instead of using a third party's, thereby promoting decentralization
- decentralized: payment is done between a client and server, with no third party needed
- private: since the system is "pay as you go", you don't need to identify yourself to claim a long lived balance
- no payment occurs on the blockchain, so there is no extra transactional load
- one may mine with a beefy server, and use those credits from a phone, by reusing the client ID (at the cost of some privacy)
- no barrier to entry: anyone may run a RPC node, and your expected revenue depends on how much work you do
- Sybil resistant: if you run 1000 idle RPC nodes, you don't magically get more revenue
- no large credit balance maintained on servers, so they have no incentive to exit scam
- you can use any/many node(s), since there's little cost in switching servers
- market based prices: competition between servers to lower costs
- incentive for a distributed third party node system: if some public nodes are overused/slow, traffic can move to others
- increases network security
- helps counteract mining pools' share of the network hash rate
- zero incentive for a payer to "double spend" since a reorg does not give any money back to the miner
And some disadvantages:
- low power clients will have difficulty mining (but one can optionally mine in advance and/or with a faster machine)
- payment is "random", so a server might go a long time without a block before getting one
- a public node's overall expected payment may be small
Public nodes are expected to compete to find a suitable level for
cost of service.
The daemon can be set up this way to require payment for RPC services:
monerod --rpc-payment-address 4xxxxxx \
--rpc-payment-credits 250 --rpc-payment-difficulty 1000
These values are an example only.
The --rpc-payment-difficulty switch selects how hard each "share" should
be, similar to a mining pool. The higher the difficulty, the fewer
shares a client will find.
The --rpc-payment-credits switch selects how many credits are awarded
for each share a client finds.
Considering both options, clients will be awarded credits/difficulty
credits for every hash they calculate. For example, in the command line
above, 0.25 credits per hash. A client mining at 100 H/s will therefore
get an average of 25 credits per second.
For reference, in the current implementation, a credit is enough to
sync 20 blocks, so a 100 H/s client that's just starting to use Monero
and uses this daemon will be able to sync 500 blocks per second.
The wallet can be set to automatically mine if connected to a daemon
which requires payment for RPC usage. It will try to keep a balance
of 50000 credits, stopping mining when it's at this level, and starting
again as credits are spent. With the example above, a new client will
mine this much credits in about half an hour, and this target is enough
to sync 500000 blocks (currently about a third of the monero blockchain).
There are three new settings in the wallet:
- credits-target: this is the amount of credits a wallet will try to
reach before stopping mining. The default of 0 means 50000 credits.
- auto-mine-for-rpc-payment-threshold: this controls the minimum
credit rate which the wallet considers worth mining for. If the
daemon credits less than this ratio, the wallet will consider mining
to be not worth it. In the example above, the rate is 0.25
- persistent-rpc-client-id: if set, this allows the wallet to reuse
a client id across runs. This means a public node can tell a wallet
that's connecting is the same as one that connected previously, but
allows a wallet to keep their credit balance from one run to the
other. Since the wallet only mines to keep a small credit balance,
this is not normally worth doing. However, someone may want to mine
on a fast server, and use that credit balance on a low power device
such as a phone. If left unset, a new client ID is generated at
each wallet start, for privacy reasons.
To mine and use a credit balance on two different devices, you can
use the --rpc-client-secret-key switch. A wallet's client secret key
can be found using the new rpc_payments command in the wallet.
Note: anyone knowing your RPC client secret key is able to use your
credit balance.
The wallet has a few new commands too:
- start_mining_for_rpc: start mining to acquire more credits,
regardless of the auto mining settings
- stop_mining_for_rpc: stop mining to acquire more credits
- rpc_payments: display information about current credits with
the currently selected daemon
The node has an extra command:
- rpc_payments: display information about clients and their
balances
The node will forget about any balance for clients which have
been inactive for 6 months. Balances carry over on node restart.
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0da09ed protocol: fix syncing from peers being too choosy about peers (moneromooo-monero)
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88c9d90 protocol: initialize block_weight in block_complete_entry ctor (moneromooo-monero)
fe443bb cryptonote: don't leave block_weight uninitialized (moneromooo-monero)
1ba9baf tx_pool: do not divide by 0 (moneromooo-monero)
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3455efa ban peers sending bad pow outright (moneromooo-monero)
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CID 204479
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8330e77 monerod can now sync from pruned blocks (moneromooo-monero)
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74a23e9 protocol: only print sync complete message when out of precompiled hashes (moneromooo-monero)
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2a7d915 Fixed i2p/tor tx flooding bug (white noise disabled) (vtnerd)
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If the peer (whether pruned or not itself) supports sending pruned blocks
to syncing nodes, the pruned version will be sent along with the hash
of the pruned data and the block weight. The original tx hashes can be
reconstructed from the pruned txes and theur prunable data hash. Those
hashes and the block weights are hashes and checked against the set of
precompiled hashes, ensuring the data we received is the original data.
It is currently not possible to use this system when not using the set
of precompiled hashes, since block weights can not otherwise be checked
for validity.
This is off by default for now, and is enabled by --sync-pruned-blocks
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PoW is expensive to verify, so be strict
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Revert a96c1a4 and adc16d2 (moneromooo-monero)
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This avoids most premature triggers
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2cd4fd8 Changed the use of boost:value_initialized for C++ list initializer (JesusRami)
4ad191f Removed unused boost/value_init header (whyamiroot)
928f4be Make null hash constants constexpr (whyamiroot)
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As a side effect, colouring on Windows should now work
regardless of version
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This reverts commit a96c1a46d4b3854252de75cbe09458ad5d1aecb0.
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This reverts commit adc16d2504d3e76b0115791caf10446684d45433.
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69465e3 cryptonote_protocol: fix '--no-sync', ignore new blocks and txes (xiphon)
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2aa1134 daemon: display peer address type in print_cn (moneromooo-monero)
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f17dcde Remove unused txs member in NOTIFY_RESPONSE_GET_OBJECT (Doy-lee)
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The check added here (in #5732/#5733) is supposed to disconnect behind
peers when the current node is syncing, but actually disconnects behind
peers always.
We are syncing when `target > our_height`, but the check here triggers
when `target > remote_height`, which is basically always true when the
preceding `m_core.have_block(hshd.top_id)` check is true.
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Any peer that's behind us while syncing is useless to us (though
not to them). This ensures that we don't get our peer slots filled
with peers that we can't use. Once we've synced, we can connect
to them and they can then sync off us if they want.
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When asking for txes in a fluffy transaction, one might ask
for the same (large) tx many times
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Count transactions as well
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Essentially, one can send such a large amount of IDs that core exhausts
all free memory. This issue can theoretically be exploited using very
large CN blockchains, such as Monero.
This is a partial fix. Thanks and credit given to CryptoNote author
'cryptozoidberg' for collaboration and the fix. Also thanks to
'moneromooo'. Referencing HackerOne report #506595.
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b0c552f5 cryptonote_protocol_handler: add block/tx hashes in notify logs (moneromooo-monero)
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c84ea299 cryptonote_basic: some more minor speedups (moneromooo-monero)
e40eb2ad cryptonote_basic: speedup calculate_block_hash (moneromooo-monero)
547a9708 cryptonote: block parsing + hash calculation speedup (moneromooo-monero)
11604b6d blockchain: avoid unneeded block copy (moneromooo-monero)
8461df04 save some database calls when getting top block hash and height (moneromooo-monero)
3bbc3661 Avoid repeated (de)serialization when syncing (moneromooo-monero)
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This saves a duplicate serialization step
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Based on Boolberry work by:
jahrsg <jahr@jahr.me>
cr.zoidberg <crypto.zoidberg@gmail.com>
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eef164f7 cryptonote_protocol_handler: search for syncing peers in "cruise mode" (moneromooo-monero)
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a54e81e5 daemon: add '--no-sync' arg to optionally disable blockchain sync (xiphon)
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551104fb daemon: add --public-node mode, RPC port propagation over P2P (xiphon)
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6a3608d3 cryptonote_protocol_handler: pad tx messages when using tor/i2p (moneromooo-monero)
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When all our outgoing peer slots are filled, we cycle one peer at
a time looking for syncing peers until we have at least two such
peers. This brings two advantages:
- Peers without incoming connections will find more syncing peers
that before, thereby strengthening network decentralization
- Peers will have more resistance to isolation attacks, as they
are more likely to find a "good" peer than they were before
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RPC connections now have optional tranparent SSL.
An optional private key and certificate file can be passed,
using the --{rpc,daemon}-ssl-private-key and
--{rpc,daemon}-ssl-certificate options. Those have as
argument a path to a PEM format private private key and
certificate, respectively.
If not given, a temporary self signed certificate will be used.
SSL can be enabled or disabled using --{rpc}-ssl, which
accepts autodetect (default), disabled or enabled.
Access can be restricted to particular certificates using the
--rpc-ssl-allowed-certificates, which takes a list of
paths to PEM encoded certificates. This can allow a wallet to
connect to only the daemon they think they're connected to,
by forcing SSL and listing the paths to the known good
certificates.
To generate long term certificates:
openssl genrsa -out /tmp/KEY 4096
openssl req -new -key /tmp/KEY -out /tmp/REQ
openssl x509 -req -days 999999 -sha256 -in /tmp/REQ -signkey /tmp/KEY -out /tmp/CERT
/tmp/KEY is the private key, and /tmp/CERT is the certificate,
both in PEM format. /tmp/REQ can be removed. Adjust the last
command to set expiration date, etc, as needed. It doesn't
make a whole lot of sense for monero anyway, since most servers
will run with one time temporary self signed certificates anyway.
SSL support is transparent, so all communication is done on the
existing ports, with SSL autodetection. This means you can start
using an SSL daemon now, but you should not enforce SSL yet or
nothing will talk to you.
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973403bc Adding initial support for broadcasting transactions over Tor (Lee Clagett)
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- Support for ".onion" in --add-exclusive-node and --add-peer
- Add --anonymizing-proxy for outbound Tor connections
- Add --anonymous-inbounds for inbound Tor connections
- Support for sharing ".onion" addresses over Tor connections
- Support for broadcasting transactions received over RPC exclusively
over Tor (else broadcast over public IP when Tor not enabled).
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The blockchain prunes seven eighths of prunable tx data.
This saves about two thirds of the blockchain size, while
keeping the node useful as a sync source for an eighth
of the blockchain.
No other data is currently pruned.
There are three ways to prune a blockchain:
- run monerod with --prune-blockchain
- run "prune_blockchain" in the monerod console
- run the monero-blockchain-prune utility
The first two will prune in place. Due to how LMDB works, this
will not reduce the blockchain size on disk. Instead, it will
mark parts of the file as free, so that future data will use
that free space, causing the file to not grow until free space
grows scarce.
The third way will create a second database, a pruned copy of
the original one. Since this is a new file, this one will be
smaller than the original one.
Once the database is pruned, it will stay pruned as it syncs.
That is, there is no need to use --prune-blockchain again, etc.
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a5ffc2d5 Remove boost::lexical_cast for uuid and unused uuid function (Lee Clagett)
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85665003 epee: better network buffer data structure (moneromooo-monero)
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5464725a protocol: change standby mode to not wait sleeping (moneromooo-monero)
85807dfb add a once_a_time_milliseconds class (moneromooo-monero)
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avoids pointless allocs and memcpy
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3dba7f25 protocol: option to pad transaction relay to the next kB (moneromooo-monero)
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506472e0 protocol: fix use after free when dropping a connection (moneromooo-monero)
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c25260f5 protocol: fix incorrect tx hash in log (moneromooo-monero)
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To help protect one's privacy from traffic volume analysis
for people using Tor or I2P. This will really fly once we
relay txes on a timer rather than on demand, though.
Off by default for now since it's wasteful and doesn't bring
anything until I2P's in.
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704b60c block_queue: faster check whether a block was requested (moneromooo-monero)
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ce9457a cryptonote_protocol: don't serialize an unneeded new block message (moneromooo-monero)
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c24a0af [monerod] Added blocks remaining count during syncronisation. (Jorropo)
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Non fluffy block nodes should now be very rare
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And percent if usefull (% < 99)
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a2b557f 6795bd0 209ec96 ed2c81e a830db2 57ea902 31a895e ba8331c f7f1917 41be339 f025ae9 ef2cb63 dcfd299 5d3e702 2704624 2771a18 0e4c7d0 (moneromooo-monero)
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also use reserve where appropriate
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3880bf39 cryptonote_protocol_handler.inl: remove span read just now that failed to pass some basic tests (stoffu)
da249fd5 cryptonote_protocol_handler.inl: fix return type mismatches (int vs bool) (stoffu)
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pass some basic tests
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0e7ad2e2 Wallet API: generalize 'bool testnet' to 'NetworkType nettype' (stoffu)
af773211 Stagenet (stoffu)
cc9a0bee command_line: allow args to depend on more than one args (stoffu)
55f8d917 command_line::get_arg: remove 'required' for dependent args as they're always optional (stoffu)
450306a0 command line: allow has_arg to handle arg_descriptor<bool,false,true> #3318 (stoffu)
9f9e095a Use `genesis_tx` parameter in `generate_genesis_block`. #3261 (Jean Pierre Dudey)
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928c1825 cryptonote_protocol: guard against all threads in standby (moneromooo-monero)
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e3f0980a daemon: don't drop RPC with busy error when running offline (moneromooo-monero)
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7ed62e63 cryptonote_protocol: fix std::move usage on different types (moneromooo-monero)
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b56f4645 cryptonote_protocol: fix size_t used in wire format (moneromooo-monero)
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69f9a075 cryptonote_protocol: fix missing space in version mismatch message (moneromooo-monero)
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f06603a4 cryptonote_protocol: update target height when receiving blocks (moneromooo-monero)
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This is 32 bits on 32 bit platforms, but 64 bits on 64 bit platforms.
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a2c845c7 cryptonote_protocol: internal error consistency size check (moneromooo-monero)
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also avoid integer underflow on zero height
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43f5269f Wallets now do not depend on the daemon rpc lib (moneromooo-monero)
bb89ae8b move connection_basic and network_throttle from src/p2p to epee (moneromooo-monero)
4abf25f3 cryptonote_core does not depend on p2p anymore (moneromooo-monero)
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These even had the epee namespace.
This fixes some ugly circular dependencies.
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As a followon side effect, this makes a lot of inline code
included only in particular cpp files (and instanciated
when necessary.
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cf5f6236 Corrections in rate limiting / trottle code, especially in 'out' direction (rbrunner7)
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Deleted 3 out of 4 calls to method connection_basic::sleep_before_packet
that were erroneous / superfluous, which enabled the elimination of a
"fudge" factor of 2.1 in connection_basic::set_rate_up_limit;
also ended the multiplying of limit values and numbers of bytes
transferred by 1024 before handing them over to the global throttle
objects
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It's sent as JSON, so raw binary is not appropriate
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It's nasty, and actually breaks on Solaris, where if.h fails to
build due to:
struct map *if_memmap;
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monero/src/cryptonote_protocol/block_queue.cpp:208:44: error:
suggest braces around initialization of subobject [-Werror,-Wmissing-braces]
static const boost::uuids::uuid uuid0 = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
{ }
monero/src/wallet/wallet_rpc_server.cpp:1895:43: error:
lambda capture 'wal' is not used [-Werror,-Wunused-lambda-capture]
tools::signal_handler::install([&wrpc, &wal](int) {
^
monero/src/cryptonote_protocol/cryptonote_protocol_handler.inl:1616:40: error:
lambda capture 'arg' is not used [-Werror,-Wunused-lambda-capture]
m_p2p->for_each_connection([this, &arg, &fluffy_arg, &exclude_context, &fullConnections...
^
monero/src/cryptonote_protocol/cryptonote_protocol_handler.inl:1616:46: error:
lambda capture 'fluffy_arg' is not used [-Werror,-Wunused-lambda-capture]
m_p2p->for_each_connection([this, &arg, &fluffy_arg, &exclude_context, &fullConnections...
^
monero/src/blockchain_utilities/blockchain_export.cpp:181:3: error:
bool literal returned from 'main' [-Werror,-Wmain]
CHECK_AND_ASSERT_MES(r, false, "Failed to initialize source blockchain storage");
^ ~~~~~
monero/contrib/epee/include/misc_log_ex.h:180:97: note:
expanded from macro 'CHECK_AND_ASSERT_MES'
...fail_ret_val, message) do{if(!(expr)) {LOG_ERROR(message); return fail_ret_val;};}while(0)
^ ~~~~~~~~~~~~
monero/src/blockchain_utilities/blockchain_export.cpp:195:3: error:
bool literal returned from 'main' [-Werror,-Wmain]
CHECK_AND_ASSERT_MES(r, false, "Failed to export blockchain raw data");
^ ~~~~~
monero/contrib/epee/include/misc_log_ex.h:180:97: note:
expanded from macro 'CHECK_AND_ASSERT_MES'
...fail_ret_val, message) do{if(!(expr)) {LOG_ERROR(message); return fail_ret_val;};}while(0)
^ ~~~~~~~~~~~~
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0a872798 protocol: kick idle peers by dropping them (moneromooo-monero)
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8028dde7 block_queue: use boost::uuids::nil_uuid where appropriate (moneromooo-monero)
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7adceee6 precomputed block hashes are now in blocks of N (currently 256) (moneromooo-monero)
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This is safer, as we don't risk break expectations (eg, requesting
block hashes and then receiving a late set of blocks). Dropping a
connection means another will be attempted in a fresh state.
Also bump the kick timeout to 5 minutes, to ensure we only kick
really idle peers.
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3487d810 cryptonote_protocol: fix needless chain hashes downloads (moneromooo-monero)
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7f2f6ee1 protocol: remove hop count on block propagation (moneromooo-monero)
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This shaves a lot of space off binaries
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The last known hash was calculated incorrectly, causing
further chain hash downloads to restart from the current
chain. When the block queue has close to 10k blocks waiting,
this causes frequent downloads of 10k more hashes, but
with only the last few hashes actually being useful.
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It is unused, as it was apparently a future optimization,
and it leaks some information (though since pools publish
thei blocks they find, that amount seems small).
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Defaults to off, but fluffy blocks are forced enabled on testnet
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c867357a cryptonote_protocol: error handling on cleanup_handle_incoming_blocks (moneromooo-monero)
ce901fcb Fix blockchain_import wedge on exception in cleanup_handle_incoming_blocks (moneromooo-monero)
84fa015e core: guard against exceptions in handle_incoming_{block,tx} (moneromooo-monero)
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fixes getting those in a loop
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c22d22e2 Cleanup test impact of adding safesyncmode() method (Howard Chu)
9a859844 Toggle SAFE syncmode on and off automatically (Howard Chu)
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This allows peers who synced past a fork on the wrong height
to reorg to the right chain after they updated their software
to include the new version.
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Fix sync wedge corner case:
It could happen if a connection went into standby mode, while
it was the one which had requested the next span, and that span
was still waiting for the data, and that peer is not on the
main chain. Other peers can then start asking for that data
again and again, but never get it as only that forked peer does.
And various other fixes
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If monerod is started with default sync mode, set it to SAFE after
synchronization completes. Set it back to FAST if synchronization
restarts (e.g. because another peer has a longer blockchain).
If monerod is started with an explicit sync mode, none of this
automation takes effect.
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5a283078 cryptonote_protocol: large block sync size before v4 (moneromooo-monero)
7b747607 cryptonote_protocol: kick idle synchronizing peers (moneromooo-monero)
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42b34b35 Consistently print peer id in hex and on 16 chars (moneromooo-monero)
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b59cd074 befor -> before (Nano Akron)
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In case they dropped off downloading for any reason, they'll get
sent to download again.
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Really unique yet consistent spelling mistake
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Not used yet.
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a1891ebe tests: fix tests build (moneromooo-monero)
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88e83f94 cryptonote_protocol_handler: log versions as unsigned ints (moneromooo-monero)
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0e8d60c0 cryptonote_protocol: fix recv/send idle time before handshake (moneromooo-monero)
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f90bbe2a cryptonote_protocol: keep target in sync with dropped connections (moneromooo-monero)
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This was broken by the reorg fix, since we now have to add blocks
regardless of their starting height. We now check whether we know
the parent for the first block in the next span, or whether it was
requested. If neither, it's an orphan. If it is not known, but was
requested, we wait to get that block.
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They're interpreted as characters otherwise
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Add get_fork_version and add_ideal_fork_version to core so
cryptonote_protocol does not have to need the Blockchain
class directly, as it's not in its dependencies, and add
those to the fake core classes in tests too.
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When a node is dropped, we stop considering its claimed blockchain
height as a factor in the target height calculation. This prevents
a runaway chain from being still thought to be the target even if
the nodes carrying it are dropped.
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We won't even talk to a peer which claims a wrong version
for its top block. This will avoid syncing to known bad
peers in the first place.
Also add IP fails when failing to verify a block.
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158c3ecf core: thread most of handle_incoming_tx (moneromooo-monero)
f57ee382 cryptonote_protocol: retry stale spans early (moneromooo-monero)
90df52e1 cryptonote_protocol: light cleanup (moneromooo-monero)
84e23156 cryptonote_protocol: avoid spurious SYNCHRONIZED OK messages (moneromooo-monero)
5be43fcd cryptonote_protocol_handler: sync speedup (moneromooo-monero)
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1c9196b0 cryptonote_protocol: fix days behind calc on testnet (moneromooo-monero)
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214fd81e some include cleanup (moneromooo-monero)
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Connections can be dropped by the net_node layer,
unbeknownst to cryptonote_protocol, which would then
not flush any spans scheduled to that connection,
which would cause it to be only downloaded again
once it becomes the next span (possibly after a small
delay if it had been requested less than 5 seconds
ago).
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A block queue is now placed between block download and
block processing. Blocks are now requested only from one
peer (unless starved).
Includes a new sync_info coommand.
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Since I had to add an ID to the derived classes anyway,
this can be used instead. This removes an apparently
pointless warning from CLANG too.
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6fc2dc39 cryptonote_protocol_handler: fix crash in debug log (moneromooo-monero)
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072102cf abstracted nework addresses (moneromooo-monero)
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All code which was using ip and port now uses a new IPv4 object,
subclass of a new network_address class. This will allow easy
addition of I2P addresses later (and also IPv6, etc).
Both old style and new style peer lists are now sent in the P2P
protocol, which is inefficient but allows peers using both
codebases to talk to each other. This will be removed in the
future. No other subclasses than IPv4 exist yet.
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Integration could go further (ie, return_tx_to_pool calls should
not be needed anymore, possibly other things).
poolstate.bin is now obsolete.
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Found by smooth
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it scares users
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424b76a4 Fix spurious synchronization status msgs (Howard Chu)
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0288310e blockchain_db: add "raw" blobdata getters for block and transaction (moneromooo-monero)
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Only update target height if it's actually greater than the current target.
Only display "synchronized" when current height equals target.
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This speeds up operations such as serving blocks to syncing peers
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- only pause mining once we've got the lock (in practice, it'll
already be paused by another thread if we can't get the lock
at once though)
- do not call prepare_handle_incoming_blocks when we dismissed
all the blocks, it only causes cleanup_handle_incoming_blocks
to complain afterwards
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8bdc86be protocol: speed up sync by minimizing duplicate work (moneromooo-monero)
61dfa310 epee: fix some log macros not printing context nicely (moneromooo-monero)
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In particular, the prepare_handle_incoming_blocks call
is pretty lengthy, and entirely pointless in the common
case where several different connections will prepare
the exact same blocks.
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- fix wrong block being used when a new block is received between
a node elaying a fluffy block and sending a new fluffy block
with txes a peer did not have
- misc a neverending ping pong requesting the same missing txids
when a new block is received in the meantime, causing the top
block to not be the one we need
- send the original fluffy block message block height when sending
a new fluffy block, not the current top height, which might
have been updated since
- avoid sending back the whole block blob when asking for txes,
send only the hash instead
- plus misc cleanup and additional debugging logs
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0644eed7 Remove boost/foreach.cpp includes (Miguel Herranz)
36dd3e23 Replace BOOST_REVERSE_FOREACH with ranged for (Miguel Herranz)
629e3101 Replace BOOST_FOREACH with C++11 ranged for (Miguel Herranz)
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database before quitting
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