feat(rpc): Implement payment_queryInfo RPC call

chain/dev/config.toml

@@ -35,5 +35,5 @@ enabled = true
 ws = true
 port = 8545
 host = "localhost"
-modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"]
+modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"]
 ws-port = 8546

chain/dev/defaults.go

@@ -87,7 +87,7 @@ var (
 	// DefaultRPCHTTPPort rpc port
 	DefaultRPCHTTPPort = uint32(8545)
 	// DefaultRPCModules rpc modules
-	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"}
+	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"}
 	// DefaultRPCWSPort rpc websocket port
 	DefaultRPCWSPort = uint32(8546)
 	// DefaultRPCEnabled enables the RPC server

chain/gssmr/config.toml

@@ -35,5 +35,5 @@ discovery-interval = 10
 enabled = false
 port = 8545
 host = "localhost"
-modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"]
+modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"]
 ws-port = 8546

chain/gssmr/defaults.go

@@ -92,7 +92,7 @@ var (
 	// DefaultRPCHTTPPort rpc port
 	DefaultRPCHTTPPort = uint32(8545)
 	// DefaultRPCModules rpc modules
-	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"}
+	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"}
 	// DefaultRPCWSPort rpc websocket port
 	DefaultRPCWSPort = uint32(8546)
 )

chain/kusama/config.toml

@@ -35,7 +35,7 @@ enabled = false
 external = false
 port = 8545
 host = "localhost"
-modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"]
+modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"]
 ws-port = 8546
 ws = false
 ws-external = false

chain/kusama/defaults.go

@@ -83,7 +83,7 @@ var (
 	// DefaultRPCHTTPPort rpc port
 	DefaultRPCHTTPPort = uint32(8545)
 	// DefaultRPCModules rpc modules
-	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"}
+	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"}
 	// DefaultRPCWSPort rpc websocket port
 	DefaultRPCWSPort = uint32(8546)
 )

chain/polkadot/config.toml

@@ -34,5 +34,5 @@ nomdns = false
 enabled = false
 port = 8545
 host = "localhost"
-modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"]
+modules = ["system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"]
 ws-port = 8546

chain/polkadot/defaults.go

@@ -84,7 +84,7 @@ var (
 	// DefaultRPCHTTPPort rpc port
 	DefaultRPCHTTPPort = uint32(8545)
 	// DefaultRPCModules rpc modules
-	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate"}
+	DefaultRPCModules = []string{"system", "author", "chain", "state", "rpc", "grandpa", "offchain", "childstate", "payment"}
 	// DefaultRPCWSPort rpc websocket port
 	DefaultRPCWSPort = uint32(8546)
 )

dot/rpc/http.go

@@ -129,6 +129,8 @@ func (h *HTTPServer) RegisterModules(mods []string) {
 			srvc = modules.NewOffchainModule(h.serverConfig.NodeStorage)
 		case "childstate":
 			srvc = modules.NewChildStateModule(h.serverConfig.StorageAPI, h.serverConfig.BlockAPI)
+		case "payment":
+			srvc = modules.NewPaymentModule(h.serverConfig.BlockAPI)
 		default:
 			h.logger.Warn("Unrecognised module", "module", mod)
 			continue

dot/rpc/modules/api.go

@@ -45,6 +45,7 @@ type BlockAPI interface {
 	SubChain(start, end common.Hash) ([]common.Hash, error)
 	RegisterRuntimeUpdatedChannel(ch chan<- runtime.Version) (uint32, error)
 	UnregisterRuntimeUpdatedChannel(id uint32) bool
+	GetRuntime(hash *common.Hash) (runtime.Instance, error)
 }
 
 // NetworkAPI interface for network state methods

dot/rpc/modules/chain_test.go

@@ -19,17 +19,21 @@ package modules
 import (
 	"io/ioutil"
 	"math/big"
+	"path/filepath"
 	"testing"
 
 	"github.com/ChainSafe/gossamer/dot/state"
 	"github.com/ChainSafe/gossamer/dot/types"
 	"github.com/ChainSafe/gossamer/lib/common"
 	"github.com/ChainSafe/gossamer/lib/genesis"
 	"github.com/ChainSafe/gossamer/lib/runtime"
+	"github.com/ChainSafe/gossamer/lib/runtime/wasmer"
 	"github.com/ChainSafe/gossamer/lib/trie"
+	"github.com/ChainSafe/gossamer/lib/utils"
 	"github.com/ChainSafe/gossamer/pkg/scale"
 
 	database "github.com/ChainSafe/chaindb"
+	rtstorage "github.com/ChainSafe/gossamer/lib/runtime/storage"
 	log "github.com/ChainSafe/log15"
 	"github.com/stretchr/testify/require"
 )
@@ -350,7 +354,19 @@ func newTestStateService(t *testing.T) *state.Service {
 	err = stateSrvc.Start()
 	require.NoError(t, err)
 
-	rt, err := stateSrvc.CreateGenesisRuntime(genTrie, gen)
+	rtCfg := &wasmer.Config{}
+
+	rtCfg.Storage, err = rtstorage.NewTrieState(genTrie)
+	require.NoError(t, err)
+
+	if stateSrvc != nil {
+		rtCfg.NodeStorage.BaseDB = stateSrvc.Base
+	} else {
+		rtCfg.NodeStorage.BaseDB, err = utils.SetupDatabase(filepath.Join(testDatadirPath, "offline_storage"), false)
+		require.NoError(t, err)
+	}
+
+	rt, err := wasmer.NewRuntimeFromGenesis(gen, rtCfg)
 	require.NoError(t, err)
 
 	err = loadTestBlocks(t, genesisHeader.Hash(), stateSrvc.Block, rt)

dot/rpc/modules/payment.go

@@ -0,0 +1,69 @@
+package modules
+
+import (
+	"net/http"
+
+	"github.com/ChainSafe/gossamer/lib/common"
+)
+
+// PaymentQueryInfoRequest represents the request to get the fee of an extrinsic in a given block
+type PaymentQueryInfoRequest struct {
+	// hex SCALE encoded extrinsic
+	Ext string
+	// hex optional block hash indicating the state
+	Hash *common.Hash
+}
+
+// PaymentQueryInfoResponse holds the response fields to the query info RPC method
+type PaymentQueryInfoResponse struct {
+	Weight     uint64 `json:"weight"`
+	Class      int    `json:"class"`
+	PartialFee string `json:"partialFee"`
+}
+
+// PaymentModule holds all the RPC implementation of polkadot payment rpc api
+type PaymentModule struct {
+	blockAPI BlockAPI
+}
+
+// NewPaymentModule returns a pointer to PaymentModule
+func NewPaymentModule(blockAPI BlockAPI) *PaymentModule {
+	return &PaymentModule{
+		blockAPI: blockAPI,
+	}
+}
+
+// QueryInfo query the known data about the fee of an extrinsic at the given block
+func (p *PaymentModule) QueryInfo(_ *http.Request, req *PaymentQueryInfoRequest, res *PaymentQueryInfoResponse) error {
+	var hash common.Hash
+	if req.Hash == nil {
+		hash = p.blockAPI.BestBlockHash()
+	} else {
+		hash = *req.Hash
+	}
+
+	r, err := p.blockAPI.GetRuntime(&hash)
+	if err != nil {
+		return err
+	}
+
+	ext, err := common.HexToBytes(req.Ext)
+	if err != nil {
+		return err
+	}
+
+	encQueryInfo, err := r.PaymentQueryInfo(ext)
+	if err != nil {
+		return err
+	}
+
+	if encQueryInfo != nil {
+		*res = PaymentQueryInfoResponse{
+			Weight:     encQueryInfo.Weight,
+			Class:      encQueryInfo.Class,
+			PartialFee: encQueryInfo.PartialFee.String(),
+		}
+	}
+
+	return nil
+}

dot/rpc/modules/payment_test.go

@@ -0,0 +1,142 @@
+package modules
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/ChainSafe/gossamer/dot/rpc/modules/mocks"
+	"github.com/ChainSafe/gossamer/dot/types"
+	"github.com/ChainSafe/gossamer/pkg/scale"
+	"github.com/stretchr/testify/mock"
+	"github.com/stretchr/testify/require"
+
+	"github.com/ChainSafe/gossamer/lib/common"
+	mocksruntime "github.com/ChainSafe/gossamer/lib/runtime/mocks"
+)
+
+func TestPaymentQueryInfo(t *testing.T) {
+	state := newTestStateService(t)
+	bestBlockHash := state.Block.BestBlockHash()
+
+	t.Run("When there is no errors", func(t *testing.T) {
+		mockedQueryInfo := &types.TransactionPaymentQueryInfo{
+			Weight:     0,
+			Class:      0,
+			PartialFee: scale.MaxUint128,
+		}
+
+		expected := PaymentQueryInfoResponse{
+			Weight:     0,
+			Class:      0,
+			PartialFee: scale.MaxUint128.String(),
+		}
+
+		runtimeMock := new(mocksruntime.MockInstance)
+		runtimeMock.On("PaymentQueryInfo", mock.AnythingOfType("[]uint8")).Return(mockedQueryInfo, nil)
+
+		blockAPIMock := new(mocks.MockBlockAPI)
+		blockAPIMock.On("BestBlockHash").Return(bestBlockHash)
+
+		blockAPIMock.On("GetRuntime", mock.AnythingOfType("*common.Hash")).Return(runtimeMock, nil)
+
+		mod := &PaymentModule{
+			blockAPI: blockAPIMock,
+		}
+
+		var req PaymentQueryInfoRequest
+		req.Ext = "0x0001"
+		req.Hash = nil
+
+		var res PaymentQueryInfoResponse
+		err := mod.QueryInfo(nil, &req, &res)
+
+		require.NoError(t, err)
+		require.Equal(t, expected, res)
+
+		// should be called because req.Hash is nil
+		blockAPIMock.AssertCalled(t, "BestBlockHash")
+		blockAPIMock.AssertCalled(t, "GetRuntime", mock.AnythingOfType("*common.Hash"))
+		runtimeMock.AssertCalled(t, "PaymentQueryInfo", mock.AnythingOfType("[]uint8"))
+	})
+
+	t.Run("When could not get runtime", func(t *testing.T) {
+		blockAPIMock := new(mocks.MockBlockAPI)
+		blockAPIMock.On("BestBlockHash").Return(bestBlockHash)
+
+		blockAPIMock.On("GetRuntime", mock.AnythingOfType("*common.Hash")).
+			Return(nil, errors.New("mocked problems"))
+
+		mod := &PaymentModule{
+			blockAPI: blockAPIMock,
+		}
+
+		var req PaymentQueryInfoRequest
+		req.Ext = "0x0011"
+		req.Hash = nil
+
+		var res PaymentQueryInfoResponse
+		err := mod.QueryInfo(nil, &req, &res)
+
+		require.Error(t, err)
+		require.Equal(t, res, PaymentQueryInfoResponse{})
+
+		blockAPIMock.AssertCalled(t, "BestBlockHash")
+		blockAPIMock.AssertCalled(t, "GetRuntime", mock.AnythingOfType("*common.Hash"))
+	})
+
+	t.Run("When PaymentQueryInfo returns error", func(t *testing.T) {
+		runtimeMock := new(mocksruntime.MockInstance)
+		runtimeMock.On("PaymentQueryInfo", mock.AnythingOfType("[]uint8")).Return(nil, errors.New("mocked error"))
+
+		blockAPIMock := new(mocks.MockBlockAPI)
+		blockAPIMock.On("GetRuntime", mock.AnythingOfType("*common.Hash")).Return(runtimeMock, nil)
+
+		mod := &PaymentModule{
+			blockAPI: blockAPIMock,
+		}
+
+		mockedHash := common.NewHash([]byte{0x01, 0x02})
+		var req PaymentQueryInfoRequest
+		req.Ext = "0x0000"
+		req.Hash = &mockedHash
+
+		var res PaymentQueryInfoResponse
+		err := mod.QueryInfo(nil, &req, &res)
+
+		require.Error(t, err)
+		require.Equal(t, res, PaymentQueryInfoResponse{})
+
+		// should be called because req.Hash is nil
+		blockAPIMock.AssertNotCalled(t, "BestBlockHash")
+		blockAPIMock.AssertCalled(t, "GetRuntime", mock.AnythingOfType("*common.Hash"))
+		runtimeMock.AssertCalled(t, "PaymentQueryInfo", mock.AnythingOfType("[]uint8"))
+	})
+
+	t.Run("When PaymentQueryInfo returns a nil info", func(t *testing.T) {
+		runtimeMock := new(mocksruntime.MockInstance)
+		runtimeMock.On("PaymentQueryInfo", mock.AnythingOfType("[]uint8")).Return(nil, nil)
+
+		blockAPIMock := new(mocks.MockBlockAPI)
+		blockAPIMock.On("GetRuntime", mock.AnythingOfType("*common.Hash")).Return(runtimeMock, nil)
+
+		mod := &PaymentModule{
+			blockAPI: blockAPIMock,
+		}
+
+		mockedHash := common.NewHash([]byte{0x01, 0x02})
+		var req PaymentQueryInfoRequest
+		req.Ext = "0x0020"
+		req.Hash = &mockedHash
+
+		var res PaymentQueryInfoResponse
+		err := mod.QueryInfo(nil, &req, &res)
+
+		require.NoError(t, err)
+		require.Equal(t, res, PaymentQueryInfoResponse{})
+
+		// should be called because req.Hash is nil
+		blockAPIMock.AssertNotCalled(t, "BestBlockHash")
+		blockAPIMock.AssertCalled(t, "GetRuntime", mock.AnythingOfType("*common.Hash"))
+		runtimeMock.AssertCalled(t, "PaymentQueryInfo", mock.AnythingOfType("[]uint8"))
+	})
+}

dot/rpc/service.go

@@ -63,11 +63,13 @@ func (s *Service) BuildMethodNames(rcvr interface{}, name string) {
 		if mtype.NumIn() != 4 {
 			continue
 		}
+
 		// First argument must be a pointer and must be http.Request.
 		reqType := mtype.In(1)
 		if reqType.Kind() != reflect.Ptr || reqType.Elem() != typeOfRequest {
 			continue
 		}
+
 		// Second argument must be a pointer and must be exported.
 		args := mtype.In(2)
 		if args.Kind() != reflect.Ptr || !isExportedOrBuiltIn(args) {