consensus

var (
	// ChangeLog contains a list of atomic changes that have happened to the
	// consensus set so that subscribers can subscribe from the most recent
	// change they have seen.
	ChangeLog = []byte("ChangeLog")

	// HeaderChangeLog contains a list of atomic changes that have happened to the
	// headers so that subscribers can subscribe from the most recent
	// change they have seen.
	HeaderChangeLog = []byte("HeaderChangeLog")

	// ChangeLogTailID is a key that points to the id of the current changelog
	// tail.
	ChangeLogTailID = []byte("ChangeLogTailID")
)

var (
	// BlockHeight is a bucket that stores the current block height.
	//
	// Generally we would just look at BlockPath.Stats(), but there is an error
	// in boltdb that prevents the bucket stats from updating until a tx is
	// committed. Wasn't a problem until we started doing the entire block as
	// one tx.
	//
	// DEPRECATED - block.Stats() should be sufficient to determine the block
	// height, but currently stats are only computed after committing a
	// transaction, therefore cannot be assumed reliable.
	BlockHeight = []byte("BlockHeight")

	// BlockMap is a database bucket containing all of the processed blocks,
	// keyed by their id. This includes blocks that are not currently in the
	// consensus set, and blocks that may not have been fully validated yet.
	BlockMap = []byte("BlockMap")

	// BlockHeaderMap is a database bucket containing all of the processed
	// block headers, keyed by their id. This includes block headers that are
	// not currently in the consensus set, and blocks that may not have been
	// fully validated yet.
	BlockHeaderMap = []byte("BlockHeaderMap")

	// BlockPath is a database bucket containing a mapping from the height of a
	// block to the id of the block at that height. BlockPath only includes
	// blocks in the current path.
	BlockPath = []byte("BlockPath")

	// BucketOak is the database bucket that contains all of the fields related
	// to the oak difficulty adjustment algorithm. The cumulative difficulty and
	// time values are stored for each block id, and then the key "OakInit"
	// contains the value "true" if the oak fields have been properly
	// initialized.
	BucketOak = []byte("Oak")

	// Consistency is a database bucket with a flag indicating whether
	// inconsistencies within the database have been detected.
	Consistency = []byte("Consistency")

	// FileContractUnlockHashMap is a database bucket that contains a mapping
	// from all contract ids to a map of blockheights with relevant unlock
	// hashes as values. This is used by full nodes when building filters for
	// SPV clients. When a storage proof or file contract revision is posted,
	// the host needs to specify the filter to include all previously related
	// UnlockHashes (which can change between revisions, but probably in
	// practice don't).
	//
	// TODO: this is currently unimplemented and so light nodes would break
	// under this weird case.
	FileContractUnlockHashMap = []byte("FileContractUnlockHashMap")

	// FileContracts is a database bucket that contains all of the open file
	// contracts.
	FileContracts = []byte("FileContracts")

	// SiacoinOutputs is a database bucket that contains all of the unspent
	// siacoin outputs.
	SiacoinOutputs = []byte("SiacoinOutputs")
)

var (

	// MaxCatchUpBlocks is the maxiumum number of blocks that can be given to
	// the consensus set in a single iteration during the initial blockchain
	// download.
	MaxCatchUpBlocks = build.Select(build.Var{
		Standard: types.BlockHeight(10),
		Dev:      types.BlockHeight(50),
		Testing:  types.BlockHeight(3),
	}).(types.BlockHeight)

	// MaxDownloadSingleBlockRequest is the node count we concurrently try to fetch
	MaxDownloadSingleBlockRequest = build.Select(build.Var{
		Standard: int(3),
		Dev:      int(1),
		Testing:  int(1),
	}).(int)
)

var (
	// FieldOakInit is a field in BucketOak that gets set to "true" after the
	// oak initialiation process has completed.
	FieldOakInit = []byte("OakInit")
)

var (
	// ValueOakInit is the value that the oak init field is set to if the oak
	// difficulty adjustment fields have been correctly intialized.
	ValueOakInit = []byte("true")
)