This modifies the blockchain.ProcessBlock function to return an
additional boolean as the first parameter which indicates whether or not
the block ended up on the main chain.
This is primarily useful for upcoming test code that needs to be able to
tell the difference between a block accepted to a side chain and a block
that either extends the main chain or causes a reorganize that causes it
to become the main chain. However, it is also useful for the addblock
utility since it allows a better error in the case a file with out of
order blocks is provided.
This moves several of the chain constants to the Params struct in the
chaincfg package which is intended for that purpose. This is mostly a
backport of the same modifications made in Decred along with a few
additional things cleaned up.
The following is an overview of the changes:
- Comment all fields in the Params struct definition
- Add locals to BlockChain instance for the calculated values based on
the provided chain params
- Rename the following param fields:
- SubsidyHalvingInterval -> SubsidyReductionInterval
- ResetMinDifficulty -> ReduceMinDifficulty
- Add new Param fields:
- CoinbaseMaturity
- TargetTimePerBlock
- TargetTimespan
- BlocksPerRetarget
- RetargetAdjustmentFactor
- MinDiffReductionTime
Rather than making the caller to pass in the median time source on
ProcessBlock and IsCurrent, modify the Config struct to include the
median time source and associate it with the chain instance when it is
created.
This is being done because both the ProcessBlock and IsCurrent functions
require access to the blockchain state already, it is a little bit safer
to ensure the time source matches the chain instance state, it
simplifies the caller logic, and it also allows its use within the logic
of the blockchain package itself which will be required by upcoming
rule change warning logic that is part of BIP9.
This commit contains the entire btcchain repository along with several
changes needed to move all of the files into the blockchain directory in
order to prepare it for merging. This does NOT update btcd or any of the
other packages to use the new location as that will be done separately.
- All import paths in the old btcchain test files have been changed to
the new location
- All references to btcchain as the package name have been changed to
blockchain
