Revert "Make gRPC requests go through tendermint Query (cosmos#8549)"

This reverts commit e306e5b.

baseapp/grpcrouter.go

@@ -2,7 +2,6 @@ package baseapp
 
 import (
 	"fmt"
-	"reflect"
 
 	"github.com/cosmos/cosmos-sdk/client/grpc/reflection"
 
@@ -14,19 +13,13 @@ import (
 
 	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
-	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 )
 
 var protoCodec = encoding.GetCodec(proto.Name)
 
 // GRPCQueryRouter routes ABCI Query requests to GRPC handlers
 type GRPCQueryRouter struct {
-	routes map[string]GRPCQueryHandler
-	// returnTypes is a map of FQ method name => its return type. It is used
-	// for cache purposes: the first time a method handler is run, we save its
-	// return type in this map. Then, on subsequent method handler calls, we
-	// decode the ABCI response bytes using the cached return type.
-	returnTypes       map[string]reflect.Type
+	routes            map[string]GRPCQueryHandler
 	interfaceRegistry codectypes.InterfaceRegistry
 	serviceData       []serviceData
 }
@@ -42,8 +35,7 @@ var _ gogogrpc.Server = &GRPCQueryRouter{}
 // NewGRPCQueryRouter creates a new GRPCQueryRouter
 func NewGRPCQueryRouter() *GRPCQueryRouter {
 	return &GRPCQueryRouter{
-		returnTypes: map[string]reflect.Type{},
-		routes:      map[string]GRPCQueryHandler{},
+		routes: map[string]GRPCQueryHandler{},
 	}
 }
 
@@ -98,17 +90,8 @@ func (qrt *GRPCQueryRouter) RegisterService(sd *grpc.ServiceDesc, handler interf
 				if qrt.interfaceRegistry != nil {
 					return codectypes.UnpackInterfaces(i, qrt.interfaceRegistry)
 				}
-
 				return nil
 			}, nil)
-
-			// If it's the first time we call this handler, then we save
-			// the return type of the handler in the `returnTypes` map.
-			// The return type will be used for decoding subsequent requests.
-			if _, found := qrt.returnTypes[fqName]; !found {
-				qrt.returnTypes[fqName] = reflect.TypeOf(res)
-			}
-
 			if err != nil {
 				return abci.ResponseQuery{}, err
 			}
@@ -144,16 +127,3 @@ func (qrt *GRPCQueryRouter) SetInterfaceRegistry(interfaceRegistry codectypes.In
 		reflection.NewReflectionServiceServer(interfaceRegistry),
 	)
 }
-
-// returnTypeOf returns the return type of a gRPC method handler. With the way the
-// `returnTypes` cache map is set up, the return type of a method handler is
-// guaranteed to be found if it's retrieved **after** the method handler ran at
-// least once. If not, then a logic error is return.
-func (qrt *GRPCQueryRouter) returnTypeOf(method string) (reflect.Type, error) {
-	returnType, found := qrt.returnTypes[method]
-	if !found {
-		return nil, sdkerrors.Wrapf(sdkerrors.ErrLogic, "cannot find %s return type", method)
-	}
-
-	return returnType, nil
-}

baseapp/grpcserver.go

@@ -2,78 +2,67 @@ package baseapp
 
 import (
 	"context"
-	"reflect"
+	"strconv"
 
 	gogogrpc "github.com/gogo/protobuf/grpc"
 	grpcmiddleware "github.com/grpc-ecosystem/go-grpc-middleware"
 	grpcrecovery "github.com/grpc-ecosystem/go-grpc-middleware/recovery"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/status"
 
-	"github.com/cosmos/cosmos-sdk/client"
+	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
-	"github.com/cosmos/cosmos-sdk/types/tx"
+	grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
 )
 
 // GRPCQueryRouter returns the GRPCQueryRouter of a BaseApp.
 func (app *BaseApp) GRPCQueryRouter() *GRPCQueryRouter { return app.grpcQueryRouter }
 
 // RegisterGRPCServer registers gRPC services directly with the gRPC server.
-func (app *BaseApp) RegisterGRPCServer(clientCtx client.Context, server gogogrpc.Server) {
-	// Define an interceptor for all gRPC queries: this interceptor will route
-	// the query through the `clientCtx`, which itself queries Tendermint.
-	interceptor := func(grpcCtx context.Context, req interface{}, info *grpc.UnaryServerInfo, _ grpc.UnaryHandler) (interface{}, error) {
-		// Two things can happen here:
-		// 1. either we're broadcasting a Tx, in which case we call Tendermint's broadcast endpoint directly,
-		// 2. or we are querying for state, in which case we call ABCI's Query.
-
-		// Case 1. Broadcasting a Tx.
-		if reqProto, ok := req.(*tx.BroadcastTxRequest); ok {
-			if !ok {
-				return nil, sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "expected %T, got %T", (*tx.BroadcastTxRequest)(nil), req)
-			}
-
-			return client.TxServiceBroadcast(grpcCtx, clientCtx, reqProto)
+func (app *BaseApp) RegisterGRPCServer(server gogogrpc.Server) {
+	// Define an interceptor for all gRPC queries: this interceptor will create
+	// a new sdk.Context, and pass it into the query handler.
+	interceptor := func(grpcCtx context.Context, req interface{}, _ *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (resp interface{}, err error) {
+		// If there's some metadata in the context, retrieve it.
+		md, ok := metadata.FromIncomingContext(grpcCtx)
+		if !ok {
+			return nil, status.Error(codes.Internal, "unable to retrieve metadata")
 		}
 
-		// Case 2. Querying state.
-		inMd, _ := metadata.FromIncomingContext(grpcCtx)
-		abciRes, outMd, err := client.RunGRPCQuery(clientCtx, grpcCtx, info.FullMethod, req, inMd)
-		if err != nil {
-			return nil, err
+		// Get height header from the request context, if present.
+		var height int64
+		if heightHeaders := md.Get(grpctypes.GRPCBlockHeightHeader); len(heightHeaders) > 0 {
+			height, err = strconv.ParseInt(heightHeaders[0], 10, 64)
+			if err != nil {
+				return nil, sdkerrors.Wrapf(
+					sdkerrors.ErrInvalidRequest,
+					"Baseapp.RegisterGRPCServer: invalid height header %q: %v", grpctypes.GRPCBlockHeightHeader, err)
+			}
+			if err := checkNegativeHeight(height); err != nil {
+				return nil, err
+			}
 		}
 
-		// We need to know the return type of the grpc method for
-		// unmarshalling abciRes.Value.
-		//
-		// When we call each method handler for the first time, we save its
-		// return type in the `returnTypes` map (see the method handler in
-		// `grpcrouter.go`). By this time, the method handler has already run
-		// at least once (in the RunGRPCQuery call), so we're sure the
-		// returnType maps is populated for this method. We're retrieving it
-		// for decoding.
-		returnType, err := app.GRPCQueryRouter().returnTypeOf(info.FullMethod)
+		// Create the sdk.Context. Passing false as 2nd arg, as we can't
+		// actually support proofs with gRPC right now.
+		sdkCtx, err := app.createQueryContext(height, false)
 		if err != nil {
 			return nil, err
 		}
 
-		// returnType is a pointer to a struct. Here, we're creating res which
-		// is a new pointer to the underlying struct.
-		res := reflect.New(returnType.Elem()).Interface()
+		// Attach the sdk.Context into the gRPC's context.Context.
+		grpcCtx = context.WithValue(grpcCtx, sdk.SdkContextKey, sdkCtx)
 
-		err = protoCodec.Unmarshal(abciRes.Value, res)
-		if err != nil {
-			return nil, err
-		}
-
-		// Send the metadata header back. The metadata currently includes:
-		// - block height.
-		err = grpc.SendHeader(grpcCtx, outMd)
-		if err != nil {
-			return nil, err
+		// Add relevant gRPC headers
+		if height == 0 {
+			height = sdkCtx.BlockHeight() // If height was not set in the request, set it to the latest
 		}
+		md = metadata.Pairs(grpctypes.GRPCBlockHeightHeader, strconv.FormatInt(height, 10))
+		grpc.SetHeader(grpcCtx, md)
 
-		return res, nil
+		return handler(grpcCtx, req)
 	}
 
 	// Loop through all services and methods, add the interceptor, and register

client/grpc_query.go

@@ -24,109 +24,101 @@ var _ gogogrpc.ClientConn = Context{}
 var protoCodec = encoding.GetCodec(proto.Name)
 
 // Invoke implements the grpc ClientConn.Invoke method
-func (ctx Context) Invoke(grpcCtx gocontext.Context, method string, req, reply interface{}, opts ...grpc.CallOption) (err error) {
+func (ctx Context) Invoke(grpcCtx gocontext.Context, method string, args, reply interface{}, opts ...grpc.CallOption) (err error) {
 	// Two things can happen here:
 	// 1. either we're broadcasting a Tx, in which call we call Tendermint's broadcast endpoint directly,
 	// 2. or we are querying for state, in which case we call ABCI's Query.
 
-	// In both cases, we don't allow empty request req (it will panic unexpectedly).
-	if reflect.ValueOf(req).IsNil() {
+	// In both cases, we don't allow empty request args (it will panic unexpectedly).
+	if reflect.ValueOf(args).IsNil() {
 		return sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "request cannot be nil")
 	}
 
 	// Case 1. Broadcasting a Tx.
-	if reqProto, ok := req.(*tx.BroadcastTxRequest); ok {
+	if isBroadcast(method) {
+		req, ok := args.(*tx.BroadcastTxRequest)
 		if !ok {
-			return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "expected %T, got %T", (*tx.BroadcastTxRequest)(nil), req)
+			return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "expected %T, got %T", (*tx.BroadcastTxRequest)(nil), args)
 		}
-		resProto, ok := reply.(*tx.BroadcastTxResponse)
+		res, ok := reply.(*tx.BroadcastTxResponse)
 		if !ok {
-			return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "expected %T, got %T", (*tx.BroadcastTxResponse)(nil), req)
+			return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "expected %T, got %T", (*tx.BroadcastTxResponse)(nil), args)
 		}
 
-		broadcastRes, err := TxServiceBroadcast(grpcCtx, ctx, reqProto)
+		broadcastRes, err := TxServiceBroadcast(grpcCtx, ctx, req)
 		if err != nil {
 			return err
 		}
-		*resProto = *broadcastRes
+		*res = *broadcastRes
 
 		return err
 	}
 
 	// Case 2. Querying state.
-	inMd, _ := metadata.FromOutgoingContext(grpcCtx)
-	abciRes, outMd, err := RunGRPCQuery(ctx, grpcCtx, method, req, inMd)
+	reqBz, err := protoCodec.Marshal(args)
 	if err != nil {
 		return err
 	}
 
-	err = protoCodec.Unmarshal(abciRes.Value, reply)
-	if err != nil {
-		return err
-	}
-
-	for _, callOpt := range opts {
-		header, ok := callOpt.(grpc.HeaderCallOption)
-		if !ok {
-			continue
-		}
-
-		*header.HeaderAddr = outMd
-	}
-
-	if ctx.InterfaceRegistry != nil {
-		return types.UnpackInterfaces(reply, ctx.InterfaceRegistry)
-	}
-
-	return nil
-}
-
-// NewStream implements the grpc ClientConn.NewStream method
-func (Context) NewStream(gocontext.Context, *grpc.StreamDesc, string, ...grpc.CallOption) (grpc.ClientStream, error) {
-	return nil, fmt.Errorf("streaming rpc not supported")
-}
-
-// RunGRPCQuery runs a gRPC query from the clientCtx, given all necessary
-// arguments for the gRPC method, and returns the ABCI response. It is used
-// to factorize code between client (Invoke) and server (RegisterGRPCServer)
-// gRPC handlers.
-func RunGRPCQuery(ctx Context, grpcCtx gocontext.Context, method string, req interface{}, md metadata.MD) (abci.ResponseQuery, metadata.MD, error) {
-	reqBz, err := protoCodec.Marshal(req)
-	if err != nil {
-		return abci.ResponseQuery{}, nil, err
-	}
-
 	// parse height header
+	md, _ := metadata.FromOutgoingContext(grpcCtx)
 	if heights := md.Get(grpctypes.GRPCBlockHeightHeader); len(heights) > 0 {
 		height, err := strconv.ParseInt(heights[0], 10, 64)
 		if err != nil {
-			return abci.ResponseQuery{}, nil, err
+			return err
 		}
 		if height < 0 {
-			return abci.ResponseQuery{}, nil, sdkerrors.Wrapf(
+			return sdkerrors.Wrapf(
 				sdkerrors.ErrInvalidRequest,
 				"client.Context.Invoke: height (%d) from %q must be >= 0", height, grpctypes.GRPCBlockHeightHeader)
 		}
 
 		ctx = ctx.WithHeight(height)
 	}
 
-	abciReq := abci.RequestQuery{
-		Path: method,
-		Data: reqBz,
+	req := abci.RequestQuery{
+		Path:   method,
+		Data:   reqBz,
+		Height: ctx.Height,
 	}
 
-	abciRes, err := ctx.QueryABCI(abciReq)
+	res, err := ctx.QueryABCI(req)
 	if err != nil {
-		return abci.ResponseQuery{}, nil, err
+		return err
+	}
+
+	err = protoCodec.Unmarshal(res.Value, reply)
+	if err != nil {
+		return err
 	}
 
 	// Create header metadata. For now the headers contain:
 	// - block height
 	// We then parse all the call options, if the call option is a
 	// HeaderCallOption, then we manually set the value of that header to the
 	// metadata.
-	md = metadata.Pairs(grpctypes.GRPCBlockHeightHeader, strconv.FormatInt(abciRes.Height, 10))
+	md = metadata.Pairs(grpctypes.GRPCBlockHeightHeader, strconv.FormatInt(res.Height, 10))
+	for _, callOpt := range opts {
+		header, ok := callOpt.(grpc.HeaderCallOption)
+		if !ok {
+			continue
+		}
+
+		*header.HeaderAddr = md
+	}
+
+	if ctx.InterfaceRegistry != nil {
+		return types.UnpackInterfaces(reply, ctx.InterfaceRegistry)
+	}
+
+	return nil
+}
+
+// NewStream implements the grpc ClientConn.NewStream method
+func (Context) NewStream(gocontext.Context, *grpc.StreamDesc, string, ...grpc.CallOption) (grpc.ClientStream, error) {
+	return nil, fmt.Errorf("streaming rpc not supported")
+}
 
-	return abciRes, md, nil
+func isBroadcast(method string) bool {
+	return method == "/cosmos.tx.v1beta1.Service/BroadcastTx"
 }

server/grpc/server.go

@@ -17,7 +17,7 @@ import (
 // StartGRPCServer starts a gRPC server on the given address.
 func StartGRPCServer(clientCtx client.Context, app types.Application, address string) (*grpc.Server, error) {
 	grpcSrv := grpc.NewServer()
-	app.RegisterGRPCServer(clientCtx, grpcSrv)
+	app.RegisterGRPCServer(grpcSrv)
 	// reflection allows consumers to build dynamic clients that can write
 	// to any cosmos-sdk application without relying on application packages at compile time
 	err := reflection.Register(grpcSrv, reflection.Config{

server/grpc/server_test.go

@@ -104,7 +104,7 @@ func (s *IntegrationTestSuite) TestGRPCServer_BankBalance() {
 	)
 	s.Require().NoError(err)
 	blockHeight = header.Get(grpctypes.GRPCBlockHeightHeader)
-	s.Require().NotEmpty(blockHeight[0]) // blockHeight is []string, first element is block height.
+	s.Require().Equal([]string{"1"}, blockHeight)
 }
 
 func (s *IntegrationTestSuite) TestGRPCServer_Reflection() {
@@ -163,6 +163,8 @@ func (s *IntegrationTestSuite) TestGRPCServer_GetTxsEvent() {
 			Events: []string{"message.action='send'"},
 		},
 	)
+	// TODO Once https://github.com/cosmos/cosmos-sdk/pull/8029 is merged, this
+	// should not error anymore.
 	s.Require().NoError(err)
 }
 
@@ -199,9 +201,9 @@ func (s *IntegrationTestSuite) TestGRPCServerInvalidHeaderHeights() {
 		value   string
 		wantErr string
 	}{
-		{"-1", "\"x-cosmos-block-height\" must be >= 0"},
+		{"-1", "height < 0"},
 		{"9223372036854775808", "value out of range"}, // > max(int64) by 1
-		{"-10", "\"x-cosmos-block-height\" must be >= 0"},
+		{"-10", "height < 0"},
 		{"18446744073709551615", "value out of range"}, // max uint64, which is  > max(int64)
 		{"-9223372036854775809", "value out of range"}, // Out of the range of for negative int64
 	}

server/types/app.go

@@ -43,7 +43,7 @@ type (
 
 		// RegisterGRPCServer registers gRPC services directly with the gRPC
 		// server.
-		RegisterGRPCServer(client.Context, grpc.Server)
+		RegisterGRPCServer(grpc.Server)
 
 		// RegisterTxService registers the gRPC Query service for tx (such as tx
 		// simulation, fetching txs by hash...).