Remove Evidence while keeping ABCI compatibility. (cosmos#915)

Removes Evidence from Block struct. Comments out relevant code lines
with:
```// Note: Temporarily remove Evidence cosmos#896```

for adding back in the future when needed.


Closes: cosmos#896

---------

Co-authored-by: Ganesha Upadhyaya <gupadhyaya@Ganeshas-MacBook-Pro-2.local>

proto/rollkit/rollkit.proto

@@ -70,7 +70,6 @@ message SignedHeader {
 message Data {
 	repeated bytes txs = 1;
 	repeated bytes intermediate_state_roots = 2;
-	repeated tendermint.abci.Evidence evidence = 3;
 }
 
 message Block {

state/executor.go

@@ -125,7 +125,8 @@ func (e *BlockExecutor) CreateBlock(height uint64, lastCommit *types.Commit, las
 		Data: types.Data{
 			Txs:                    toRollkitTxs(mempoolTxs),
 			IntermediateStateRoots: types.IntermediateStateRoots{RawRootsList: nil},
-			Evidence:               types.EvidenceData{Evidence: nil},
+			// Note: Temporarily remove Evidence #896
+			// Evidence:               types.EvidenceData{Evidence: nil},
 		},
 	}
 	block.SignedHeader.Header.LastCommitHash = e.getLastCommitHash(lastCommit, &block.SignedHeader.Header)

types/block.go

@@ -30,7 +30,8 @@ var _ encoding.BinaryUnmarshaler = &Block{}
 type Data struct {
 	Txs                    Txs
 	IntermediateStateRoots IntermediateStateRoots
-	Evidence               EvidenceData
+	// Note: Temporarily remove Evidence #896
+	// Evidence               EvidenceData
 }
 
 // EvidenceData defines how evidence is stored in block.

types/serialization.go

@@ -1,8 +1,6 @@
 package types
 
 import (
-	abci "github.com/tendermint/tendermint/abci/types"
-
 	"github.com/tendermint/tendermint/types"
 
 	pb "github.com/rollkit/rollkit/types/pb/rollkit"
@@ -183,7 +181,8 @@ func (d *Data) ToProto() *pb.Data {
 	return &pb.Data{
 		Txs:                    txsToByteSlices(d.Txs),
 		IntermediateStateRoots: d.IntermediateStateRoots.RawRootsList,
-		Evidence:               evidenceToProto(d.Evidence),
+		// Note: Temporarily remove Evidence #896
+		// Evidence:               evidenceToProto(d.Evidence),
 	}
 }
 
@@ -195,7 +194,8 @@ func (b *Block) FromProto(other *pb.Block) error {
 	}
 	b.Data.Txs = byteSlicesToTxs(other.Data.Txs)
 	b.Data.IntermediateStateRoots.RawRootsList = other.Data.IntermediateStateRoots
-	b.Data.Evidence = evidenceFromProto(other.Data.Evidence)
+	// Note: Temporarily remove Evidence #896
+	// b.Data.Evidence = evidenceFromProto(other.Data.Evidence)
 
 	return nil
 }
@@ -302,22 +302,24 @@ func byteSlicesToTxs(bytes [][]byte) Txs {
 	return txs
 }
 
-func evidenceToProto(evidence EvidenceData) []*abci.Evidence {
-	var ret []*abci.Evidence
-	for _, e := range evidence.Evidence {
-		for i := range e.ABCI() {
-			ae := e.ABCI()[i]
-			ret = append(ret, &ae)
-		}
-	}
-	return ret
-}
-
-func evidenceFromProto(evidence []*abci.Evidence) EvidenceData {
-	var ret EvidenceData
-	// TODO(tzdybal): right now Evidence is just an interface without implementations
-	return ret
-}
+// Note: Temporarily remove Evidence #896
+
+// func evidenceToProto(evidence EvidenceData) []*abci.Evidence {
+// 	var ret []*abci.Evidence
+// 	for _, e := range evidence.Evidence {
+// 		for i := range e.ABCI() {
+// 			ae := e.ABCI()[i]
+// 			ret = append(ret, &ae)
+// 		}
+// 	}
+// 	return ret
+// }
+
+// func evidenceFromProto(evidence []*abci.Evidence) EvidenceData {
+// 	var ret EvidenceData
+// 	// TODO(tzdybal): right now Evidence is just an interface without implementations
+// 	return ret
+// }
 
 func signaturesToByteSlices(sigs []Signature) [][]byte {
 	if sigs == nil {

types/serialization_test.go

@@ -79,7 +79,8 @@ func TestBlockSerializationRoundTrip(t *testing.T) {
 				Txs:                    nil,
 				IntermediateStateRoots: IntermediateStateRoots{RawRootsList: [][]byte{{0x1}}},
 				// TODO(tzdybal): update when we have actual evidence types
-				Evidence: EvidenceData{Evidence: nil},
+				// Note: Temporarily remove Evidence #896
+				// Evidence: EvidenceData{Evidence: nil},
 			},
 		}},
 	}