rpc: implement getnativecontracts RPC

internal/fakechain/fakechain.go

@@ -85,6 +85,11 @@ func (*FakeChain) IsExtensibleAllowed(uint160 util.Uint160) bool {
 	return true
 }
 
+// GetNatives implements blockchainer.Blockchainer interface.
+func (*FakeChain) GetNatives() []state.NativeContract {
+	panic("TODO")
+}
+
 // GetNotaryDepositExpiration implements Blockchainer interface.
 func (chain *FakeChain) GetNotaryDepositExpiration(acc util.Uint160) uint32 {
 	if chain.NotaryDepositExpiration != 0 {

pkg/core/blockchain.go

@@ -1243,6 +1243,19 @@ func (bc *Blockchain) GetNativeContractScriptHash(name string) (util.Uint160, er
 	return util.Uint160{}, errors.New("Unknown native contract")
 }
 
+// GetNatives returns list of native contracts.
+func (bc *Blockchain) GetNatives() []state.NativeContract {
+	res := make([]state.NativeContract, len(bc.contracts.Contracts))
+	for i, c := range bc.contracts.Contracts {
+		md := c.Metadata()
+		res[i].ID = md.ContractID
+		res[i].Hash = md.Hash
+		res[i].Manifest = md.Manifest
+		res[i].NEF = md.NEF
+	}
+	return res
+}
+
 // GetConfig returns the config stored in the blockchain.
 func (bc *Blockchain) GetConfig() config.ProtocolConfiguration {
 	return bc.config

pkg/core/blockchainer/blockchainer.go

@@ -45,6 +45,7 @@ type Blockchainer interface {
 	GetAppExecResults(util.Uint256, trigger.Type) ([]state.AppExecResult, error)
 	GetNotaryDepositExpiration(acc util.Uint160) uint32
 	GetNativeContractScriptHash(string) (util.Uint160, error)
+	GetNatives() []state.NativeContract
 	GetNextBlockValidators() ([]*keys.PublicKey, error)
 	GetNEP17Balances(util.Uint160) *state.NEP17Balances
 	GetNotaryContractScriptHash() util.Uint160

pkg/core/state/contract.go

@@ -30,6 +30,12 @@ type ContractBase struct {
 	Manifest manifest.Manifest `json:"manifest"`
 }
 
+// NativeContract holds information about native contract.
+type NativeContract struct {
+	ContractBase
+	ActiveBlockIndex uint32 `json:"activeblockindex"`
+}
+
 // DecodeBinary implements Serializable interface.
 func (c *Contract) DecodeBinary(r *io.BinReader) {
 	si := stackitem.DecodeBinaryStackItem(r)

pkg/rpc/server/server.go

@@ -103,6 +103,7 @@ var rpcHandlers = map[string]func(*Server, request.Params) (interface{}, *respon
 	"getcommittee":           (*Server).getCommittee,
 	"getconnectioncount":     (*Server).getConnectionCount,
 	"getcontractstate":       (*Server).getContractState,
+	"getnativecontracts":     (*Server).getNativeContracts,
 	"getnep17balances":       (*Server).getNEP17Balances,
 	"getnep17transfers":      (*Server).getNEP17Transfers,
 	"getpeers":               (*Server).getPeers,
@@ -986,6 +987,10 @@ func (s *Server) getContractState(reqParams request.Params) (interface{}, *respo
 	return cs, nil
 }
 
+func (s *Server) getNativeContracts(_ request.Params) (interface{}, *response.Error) {
+	return s.chain.GetNatives(), nil
+}
+
 // getBlockSysFee returns the system fees of the block, based on the specified index.
 func (s *Server) getBlockSysFee(reqParams request.Params) (interface{}, *response.Error) {
 	param := reqParams.ValueWithType(0, request.NumberT)

pkg/rpc/server/server_test.go

@@ -552,6 +552,22 @@ var rpcTestCases = map[string][]rpcTestCase{
 			},
 		},
 	},
+	"getnativecontracts": {
+		{
+			params: "[]",
+			result: func(e *executor) interface{} {
+				return new([]state.NativeContract)
+			},
+			check: func(t *testing.T, e *executor, res interface{}) {
+				lst := res.(*[]state.NativeContract)
+				for i := range *lst {
+					cs := e.chain.GetContractState((*lst)[i].Hash)
+					require.NotNil(t, cs)
+					require.True(t, cs.ID <= 0)
+				}
+			},
+		},
+	},
 	"getpeers": {
 		{
 			params: "[]",