Merge pull request #1011 from cosmos/cwgoes/slashing

Implement slashing (v1)

types/context.go

@@ -31,6 +31,7 @@ type Context struct {
 
 // create a new context
 func NewContext(ms MultiStore, header abci.Header, isCheckTx bool, txBytes []byte, logger log.Logger) Context {
+
 	c := Context{
 		Context: context.Background(),
 		pst:     newThePast(),
@@ -43,6 +44,7 @@ func NewContext(ms MultiStore, header abci.Header, isCheckTx bool, txBytes []byt
 	c = c.WithIsCheckTx(isCheckTx)
 	c = c.WithTxBytes(txBytes)
 	c = c.WithLogger(logger)
+	c = c.WithAbsentValidators(nil)
 	c = c.WithGasMeter(NewInfiniteGasMeter())
 	return c
 }
@@ -128,6 +130,7 @@ const (
 	contextKeyIsCheckTx
 	contextKeyTxBytes
 	contextKeyLogger
+	contextKeyAbsentValidators
 	contextKeyGasMeter
 )
 
@@ -157,6 +160,9 @@ func (c Context) TxBytes() []byte {
 func (c Context) Logger() log.Logger {
 	return c.Value(contextKeyLogger).(log.Logger)
 }
+func (c Context) AbsentValidators() [][]byte {
+	return c.Value(contextKeyAbsentValidators).([][]byte)
+}
 func (c Context) GasMeter() GasMeter {
 	return c.Value(contextKeyGasMeter).(GasMeter)
 }
@@ -182,6 +188,9 @@ func (c Context) WithTxBytes(txBytes []byte) Context {
 func (c Context) WithLogger(logger log.Logger) Context {
 	return c.withValue(contextKeyLogger, logger)
 }
+func (c Context) WithAbsentValidators(AbsentValidators [][]byte) Context {
+	return c.withValue(contextKeyAbsentValidators, AbsentValidators)
+}
 func (c Context) WithGasMeter(meter GasMeter) Context {
 	return c.withValue(contextKeyGasMeter, meter)
 }

types/stake.go

@@ -56,8 +56,11 @@ type ValidatorSet interface {
 	IterateValidatorsBonded(Context,
 		func(index int64, validator Validator) (stop bool))
 
-	Validator(Context, Address) Validator // get a particular validator by owner address
-	TotalPower(Context) Rat               // total power of the validator set
+	Validator(Context, Address) Validator     // get a particular validator by owner address
+	TotalPower(Context) Rat                   // total power of the validator set
+	Slash(Context, crypto.PubKey, int64, Rat) // slash the validator and delegators of the validator, specifying offence height & slash fraction
+	Revoke(Context, crypto.PubKey)            // revoke a validator
+	Unrevoke(Context, crypto.PubKey)          // unrevoke a validator
 }
 
 //_______________________________________________________________________________

types/tags.go

@@ -25,6 +25,11 @@ func (t Tags) AppendTags(a Tags) Tags {
 	return append(t, a...)
 }
 
+// Turn tags into KVPair list
+func (t Tags) ToKVPairs() []cmn.KVPair {
+	return []cmn.KVPair(t)
+}
+
 // New variadic tags, must be k string, v []byte repeating
 func NewTags(tags ...interface{}) Tags {
 	var ret Tags