htlcswitch/hodl/flags: adds flags signifying switch breakpoints

This commit is contained in:
Conner Fromknecht 2018-04-24 18:09:51 -07:00
parent e677b1e9c4
commit 941bdcafad
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111
htlcswitch/hodl/flags.go Normal file

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package hodl
import "fmt"
// MaskNone represents the empty Mask, in which no breakpoints are
// active.
const MaskNone = Mask(0)
type (
// Flag represents a single breakpoint where an HTLC should be dropped
// during forwarding. Flags can be composed into a Mask to express more
// complex combinations.
Flag uint32
// Mask is a bitvector combining multiple Flags that can be queried to
// see which breakpoints are active.
Mask uint32
)
const (
// ExitSettle drops an incoming ADD for which we are the exit node,
// before processing in the link.
ExitSettle Flag = 1 << iota
// AddIncoming drops an incoming ADD before processing if we are not
// the exit node.
AddIncoming
// SettleIncoming drops an incoming SETTLE before processing if we
// are not the exit node.
SettleIncoming
// FailIncoming drops an incoming FAIL before processing if we are
// not the exit node.
FailIncoming
// TODO(conner): add modes for switch breakpoints
// AddOutgoing drops an outgoing ADD before it is added to the
// in-memory commitment state of the link.
AddOutgoing
// SettleOutgoing drops an SETTLE before it is added to the
// in-memory commitment state of the link.
SettleOutgoing
// FailOutgoing drops an outgoing FAIL before is is added to the
// in-memory commitment state of the link.
FailOutgoing
// Commit drops all HTLC after any outgoing circuits have been
// opened, but before the in-memory commitment state is persisted.
Commit
)
// String returns a human-readable identifier for a given Flag.
func (f Flag) String() string {
switch f {
case ExitSettle:
return "ExitSettle"
case AddIncoming:
return "AddIncoming"
case SettleIncoming:
return "SettleIncoming"
case FailIncoming:
return "FailIncoming"
case AddOutgoing:
return "AddOutgoing"
case SettleOutgoing:
return "SettleOutgoing"
case FailOutgoing:
return "FailOutgoing"
case Commit:
return "Commit"
default:
return "UnknownHodlFlag"
}
}
// Warning generates a warning message to log if a particular breakpoint is
// triggered during execution.
func (f Flag) Warning() string {
var msg string
switch f {
case ExitSettle:
msg = "will not attempt to settle ADD with sender"
case AddIncoming:
msg = "will not attempt to forward ADD to switch"
case SettleIncoming:
msg = "will not attempt to forward SETTLE to switch"
case FailIncoming:
msg = "will not attempt to forward FAIL to switch"
case AddOutgoing:
msg = "will not update channel state with downstream ADD"
case SettleOutgoing:
msg = "will not update channel state with downstream SETTLE"
case FailOutgoing:
msg = "will not update channel state with downstream FAIL"
case Commit:
msg = "will not commit pending channel updates"
default:
msg = "incorrect hodl flag usage"
}
return fmt.Sprintf("%s mode enabled -- %s", f, msg)
}
// Mask returns the Mask consisting solely of this Flag.
func (f Flag) Mask() Mask {
return Mask(f)
}