Add gRPC server & reflection (#6463)

* Add gRPC proxy

* Make GRPC disabled by default

* WIP on integration tests

* WIP on integration tests

* Start setting up in process tests

* Start setting up in process tests

* Make it compile

* Add start server to network util

* Add Println

* Use go routine

* Fix scopelint

* Move to proxy_test

* Add response type cache

* Remove proxy

* Tweaks

* Use channel to handle error

* Use error chan

* Update server/start.go

Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>

* Use %w

* Add sdk.Context

* Add comments

* Fix lint

* Add header and tests

* Address comments

* Factorize some code

* Fix lint

* Add height and prove in req metadata

* Add reflection test

* Fix lint

* Put grpc test in server/grpc

* Update baseapp/grpcserver.go

* Update baseapp/grpcserver.go

* Remove proof header

Co-authored-by: Amaury Martiny <amaury.martiny@protonmail.com>
Co-authored-by: Federico Kunze <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: SaReN <sahithnarahari@gmail.com>

testutil/network/network.go

@@ -24,6 +24,7 @@ import (
 	"github.com/tendermint/tendermint/node"
 	tmclient "github.com/tendermint/tendermint/rpc/client"
 	dbm "github.com/tendermint/tm-db"
+	"google.golang.org/grpc"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
 	"github.com/cosmos/cosmos-sdk/client"
@@ -33,6 +34,7 @@ import (
 	"github.com/cosmos/cosmos-sdk/server"
 	"github.com/cosmos/cosmos-sdk/server/api"
 	srvconfig "github.com/cosmos/cosmos-sdk/server/config"
+	servertypes "github.com/cosmos/cosmos-sdk/server/types"
 	"github.com/cosmos/cosmos-sdk/simapp"
 	storetypes "github.com/cosmos/cosmos-sdk/store/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
@@ -47,9 +49,9 @@ var lock = new(sync.Mutex)
 
 // AppConstructor defines a function which accepts a network configuration and
 // creates an ABCI Application to provide to Tendermint.
-type AppConstructor = func(val Validator) server.Application
+type AppConstructor = func(val Validator) servertypes.Application
 
-func NewSimApp(val Validator) server.Application {
+func NewSimApp(val Validator) servertypes.Application {
 	return simapp.NewSimApp(
 		val.Ctx.Logger, dbm.NewMemDB(), nil, true, make(map[int64]bool), val.Ctx.Config.RootDir, 0,
 		baseapp.SetPruning(storetypes.NewPruningOptionsFromString(val.AppConfig.Pruning)),
@@ -120,7 +122,7 @@ type (
 		BaseDir    string
 		Validators []*Validator
 
-		config Config
+		Config Config
 	}
 
 	// Validator defines an in-process Tendermint validator node. Through this object,
@@ -143,6 +145,7 @@ type (
 
 		tmNode *node.Node
 		api    *api.Server
+		grpc   *grpc.Server
 	}
 )
 
@@ -159,7 +162,7 @@ func New(t *testing.T, cfg Config) *Network {
 		T:          t,
 		BaseDir:    baseDir,
 		Validators: make([]*Validator, cfg.NumValidators),
-		config:     cfg,
+		Config:     cfg,
 	}
 
 	t.Log("preparing test network...")
@@ -205,6 +208,11 @@ func New(t *testing.T, cfg Config) *Network {
 			rpcAddr, _, err := server.FreeTCPAddr()
 			require.NoError(t, err)
 			tmCfg.RPC.ListenAddress = rpcAddr
+
+			_, grpcPort, err := server.FreeTCPAddr()
+			require.NoError(t, err)
+			appCfg.GRPC.Address = fmt.Sprintf("0.0.0.0:%s", grpcPort)
+			appCfg.GRPC.Enable = true
 		}
 
 		logger := log.NewNopLogger()
@@ -431,7 +439,7 @@ func (n *Network) Cleanup() {
 		}
 	}
 
-	if n.config.CleanupDir {
+	if n.Config.CleanupDir {
 		_ = os.RemoveAll(n.BaseDir)
 	}
 

testutil/network/util.go

@@ -15,6 +15,7 @@ import (
 
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/server/api"
+	servergrpc "github.com/cosmos/cosmos-sdk/server/grpc"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
 	banktypes "github.com/cosmos/cosmos-sdk/x/bank/types"
 	"github.com/cosmos/cosmos-sdk/x/genutil"
@@ -82,6 +83,15 @@ func startInProcess(cfg Config, val *Validator) error {
 		val.api = apiSrv
 	}
 
+	if val.AppConfig.GRPC.Enable {
+		grpcSrv, err := servergrpc.StartGRPCServer(app, val.AppConfig.GRPC.Address)
+		if err != nil {
+			return err
+		}
+
+		val.grpc = grpcSrv
+	}
+
 	return nil
 }