gRPC-web proxy (#8077)

* init

* WIP config

* WIP add proxy server

* fmt

* WIP

* setup proxy server

* clean go.mod

* lint

* lint

* lint

* custom codec

* lint

* add comments

* change grpc-proxy port

* add grpc-web

* update server/start.go

* add tests

* add test with client

* Update server/start.go

Co-authored-by: Anil Kumar Kammari <anil@vitwit.com>

* Update server/start.go

Co-authored-by: Amaury <amaury.martiny@protonmail.com>

* Update server/start.go

Co-authored-by: Amaury <amaury.martiny@protonmail.com>

* review changes

* review changes

* Update server/start.go

Co-authored-by: Anil Kumar Kammari <anil@vitwit.com>
Co-authored-by: Amaury <amaury.martiny@protonmail.com>
Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

server/config/config.go

@@ -14,8 +14,11 @@ import (
 const (
 	defaultMinGasPrices = ""
 
-	// DefaultGRPCAddress is the default address the gRPC server binds to.
+	// DefaultGRPCAddress defines the default address to bind the gRPC server to.
 	DefaultGRPCAddress = "0.0.0.0:9090"
+
+	// DefaultGRPCWebAddress defines the default address to bind the gRPC-web server to.
+	DefaultGRPCWebAddress = "0.0.0.0:9091"
 )
 
 // BaseConfig defines the server's basic configuration
@@ -107,6 +110,15 @@ type GRPCConfig struct {
 	Address string `mapstructure:"address"`
 }
 
+// GRPCWebConfig defines configuration for the gRPC-web server.
+type GRPCWebConfig struct {
+	// Enable defines if the gRPC-web should be enabled.
+	Enable bool `mapstructure:"enable"`
+
+	// Address defines the gRPC-web server to listen on
+	Address string `mapstructure:"address"`
+}
+
 // StateSyncConfig defines the state sync snapshot configuration.
 type StateSyncConfig struct {
 	// SnapshotInterval sets the interval at which state sync snapshots are taken.
@@ -126,6 +138,7 @@ type Config struct {
 	Telemetry telemetry.Config `mapstructure:"telemetry"`
 	API       APIConfig        `mapstructure:"api"`
 	GRPC      GRPCConfig       `mapstructure:"grpc"`
+	GRPCWeb   GRPCWebConfig    `mapstructure:"grpc-web"`
 	StateSync StateSyncConfig  `mapstructure:"state-sync"`
 }
 
@@ -185,6 +198,10 @@ func DefaultConfig() *Config {
 			Enable:  true,
 			Address: DefaultGRPCAddress,
 		},
+		GRPCWeb: GRPCWebConfig{
+			Enable:  true,
+			Address: DefaultGRPCWebAddress,
+		},
 		StateSync: StateSyncConfig{
 			SnapshotInterval:   0,
 			SnapshotKeepRecent: 2,
@@ -239,6 +256,10 @@ func GetConfig(v *viper.Viper) Config {
 			Enable:  v.GetBool("grpc.enable"),
 			Address: v.GetString("grpc.address"),
 		},
+		GRPCWeb: GRPCWebConfig{
+			Enable:  v.GetBool("grpc-web.enable"),
+			Address: v.GetString("grpc-web.address"),
+		},
 		StateSync: StateSyncConfig{
 			SnapshotInterval:   v.GetUint64("state-sync.snapshot-interval"),
 			SnapshotKeepRecent: v.GetUint32("state-sync.snapshot-keep-recent"),

server/config/toml.go

@@ -147,6 +147,19 @@ enable = {{ .GRPC.Enable }}
 # Address defines the gRPC server address to bind to.
 address = "{{ .GRPC.Address }}"
 
+###############################################################################
+###                        gRPC Web Configuration                           ###
+###############################################################################
+
+[grpc-web]
+
+# GRPCWebEnable defines if the gRPC-web should be enabled.
+# NOTE: gRPC must also be enabled, otherwise, this configuration is a no-op.
+enable = {{ .GRPCWeb.Enable }}
+
+# Address defines the gRPC-web server address to bind to.
+address = "{{ .GRPCWeb.Address }}"
+
 ###############################################################################
 ###                        State Sync Configuration                         ###
 ###############################################################################