It is not safe to remove an item from a container/list while iterating the
list without first saving the next pointer since removing the item nils
the internal list element's next pointer.
It is technically possible for the Read method on a reader to return zero
bytes read with a nil error even though that behavior is "discouraged" by
the interface documenation. This commit switches the read of the first
byte to use io.ReadFull which will always error in this case.
This commit corrects the reading of the serialized height in coinbase
transactions for block height of version 2 or greater. On mainnet, the
serialized height is always 3 bytes and will continue to be so for
something like another ~159 years, so there was no issue with mainnet.
However on testnet, there are some version 2 blocks which are low enough
in the chain to only take 2 bytes to serialize.
In addition, this commit adds a full tests for the relavant function
including negative tests and variable length serialized lengths for block
heights.
Closes#1.
btcdb was changed a while back to not insert the genesis block by default.
This commit modifies the reorg test to insert it as required so not all
blocks are orphans.
Rather than showing all errors from ProcessTransaction as a failure, check
if the error is a TxRuleError meaning the transaction was rejected as
opposed to something actually going wrong and log it accordingly.
Rather than showing all errors from ProcessBlock as a failure, check if
the error is a RuleError meaning the block was rejected as opposed to
something actually going wrong and log it accordingly.
This utility is useful to programatically identify checkpoint candidates
which a developer can then do a more in-depth analysis on to choose an
appropriate checkpoint.
This commit is a rather large one which implements transaction pool and
relay according to the protocol rules of the reference implementation.
It makes use of btcchain to ensure the transactions are valid for the
block chain and includes several stricter checks which determine if they
are "standard" or not before admitting them into the pool and relaying
them.
There are still a few TODOs around the more strict rules which determine
which transactions are willing to be mined, but the core checks which
are imperative (everything except the all of the "standard" checks really)
to operate as a good citizen on the bitcoin network are in place.
FetchTxBySha changes what it returns, it can now return a TxListReply and
and error if none are found.
FetchTxByShaList is renamed to FetchUnSpentTxByShaList to indicate that
it will (likey/eventually) only return Tx that have some unspent TxOuts.
Tx which are fully spent may not be (reliably) looked up using this API.
We originally wanted to also not fetch orphan parents in this commit, however,
I have discovered that if you are doing a main sync from a peer, if it
sends you an orphan you must fetch it, else you ahven't fetched
everything it told you about and thus it will nto send you end more invs
from the main sync.
So we always fetch orphan parents, but we still don't fetch from
non-sync peers (all invs from them will be unsolicited). Seems to fix some hangs
with multiple peers.
The "official" regression test tool intentionally sends some unrequested
duplicate blocks to ensure the chain handling code does not fail when
trying to insert them. This commit adds an exception to the block manager
which typically disconnects peers that send unrequested blocks (they are
misbehaving if they do this) for regression test mode.
Really, it would be nice to pass an interface{} into chain to be given
to us when the callback calls, it would avoid the awkward sidchanneling
through the map and should actually be more efffieint (pointer passing >
hashtable insert, lookup, then remove).
Rather than using a channel for notifictions, use a callback instead.
There are several issues that arise with async notifications via a
channel, so use a callback instead. The caller can always make the
notifications async by using channels in the provided callback if
needed.
