ConsensusState/DumpConsensusState implementation (cosmos#273)

* feat: ConsensusState/DumpConsensusState implementation

Resolves cosmos#242
Resolves cosmos#243

CHANGELOG-PENDING.md

@@ -22,6 +22,7 @@ Month, DD, YYYY
 - [rpc] [Implement BlockByHash #256](https://github.com/celestiaorg/optimint/pull/256) [@mauriceLC92](https://github.com/mauriceLC92)
 - [rpc] [Implement BlockResults #263](https://github.com/celestiaorg/optimint/pull/263) [@tzdybal](https://github.com/tzdybal/)
 - [store,indexer] [Replace tm-db dependency with store package #268](https://github.com/celestiaorg/optimint/pull/268) [@tzdybal](https://github.com/tzdybal/)
+- [rpc] [Implement ConsensusState/DumpConsensusState #273](https://github.com/celestiaorg/optimint/pull/273) [@tzdybal](https://github.com/tzdybal/)
 
 ### BUG FIXES
 - [store] [Use KeyCopy instead of Key in BadgerIterator #274](https://github.com/celestiaorg/optimint/pull/274) [@tzdybal](https://github.com/tzdybal/)

rpc/client/client.go

@@ -31,6 +31,10 @@ const (
 	subscribeTimeout = 5 * time.Second
 )
 
+var (
+	ErrConsensusStateNotAvailable = errors.New("consensus state not available in Optimint")
+)
+
 var _ rpcclient.Client = &Client{}
 
 type Client struct {
@@ -291,13 +295,11 @@ func (c *Client) NetInfo(ctx context.Context) (*ctypes.ResultNetInfo, error) {
 }
 
 func (c *Client) DumpConsensusState(ctx context.Context) (*ctypes.ResultDumpConsensusState, error) {
-	// need consensus state
-	panic("DumpConsensusState - not implemented!")
+	return nil, ErrConsensusStateNotAvailable
 }
 
 func (c *Client) ConsensusState(ctx context.Context) (*ctypes.ResultConsensusState, error) {
-	// need consensus state
-	panic("ConsensusState - not implemented!")
+	return nil, ErrConsensusStateNotAvailable
 }
 
 func (c *Client) ConsensusParams(ctx context.Context, height *int64) (*ctypes.ResultConsensusParams, error) {

rpc/client/client_test.go

@@ -333,6 +333,22 @@ func TestUnconfirmedTxsLimit(t *testing.T) {
 	assert.NotContains(txRes.Txs, tx2)
 }
 
+func TestConsensusState(t *testing.T) {
+	assert := assert.New(t)
+	require := require.New(t)
+
+	_, rpc := getRPC(t)
+	require.NotNil(rpc)
+
+	resp1, err := rpc.ConsensusState(context.Background())
+	assert.Nil(resp1)
+	assert.ErrorIs(err, ErrConsensusStateNotAvailable)
+
+	resp2, err := rpc.DumpConsensusState(context.Background())
+	assert.Nil(resp2)
+	assert.ErrorIs(err, ErrConsensusStateNotAvailable)
+}
+
 // copy-pasted from store/store_test.go
 func getRandomBlock(height uint64, nTxs int) *types.Block {
 	block := &types.Block{