cli: allow to provide network-specific node config file

Close #2978.

Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>

cli/options/options.go

@@ -35,9 +35,9 @@ const RPCEndpointFlag = "rpc-endpoint"
 // Network is a set of flags for choosing the network to operate on
 // (privnet/mainnet/testnet).
 var Network = []cli.Flag{
-	cli.BoolFlag{Name: "privnet, p", Usage: "use private network configuration"},
-	cli.BoolFlag{Name: "mainnet, m", Usage: "use mainnet network configuration"},
-	cli.BoolFlag{Name: "testnet, t", Usage: "use testnet network configuration"},
+	cli.BoolFlag{Name: "privnet, p", Usage: "use private network configuration (if --config-file option is not specified)"},
+	cli.BoolFlag{Name: "mainnet, m", Usage: "use mainnet network configuration (if --config-file option is not specified)"},
+	cli.BoolFlag{Name: "testnet, t", Usage: "use testnet network configuration (if --config-file option is not specified)"},
 	cli.BoolFlag{Name: "unittest", Hidden: true},
 }
 
@@ -63,7 +63,14 @@ var Historic = cli.StringFlag{
 // Config is a flag for commands that use node configuration.
 var Config = cli.StringFlag{
 	Name:  "config-path",
-	Usage: "path to directory with configuration files",
+	Usage: "path to directory with per-network configuration files (may be overridden by --config-file option for the configuration file)",
+}
+
+// ConfigFile is a flag for commands that use node configuration and provide
+// path to the specific config file instead of config path.
+var ConfigFile = cli.StringFlag{
+	Name:  "config-file",
+	Usage: "path to the node configuration file (overrides --config-path option)",
 }
 
 // Debug is a flag for commands that allow node in debug mode usage.
@@ -152,7 +159,11 @@ func GetRPCWithInvoker(gctx context.Context, ctx *cli.Context, signers []transac
 // GetConfigFromContext looks at the path and the mode flags in the given config and
 // returns an appropriate config.
 func GetConfigFromContext(ctx *cli.Context) (config.Config, error) {
-	configPath := "./config"
+	var configFile = ctx.String("config-file")
+	if len(configFile) != 0 {
+		return config.LoadFile(configFile)
+	}
+	var configPath = "./config"
 	if argCp := ctx.String("config-path"); argCp != "" {
 		configPath = argCp
 	}

cli/server/server.go

@@ -34,7 +34,7 @@ import (
 
 // NewCommands returns 'node' command.
 func NewCommands() []cli.Command {
-	cfgFlags := []cli.Flag{options.Config}
+	cfgFlags := []cli.Flag{options.Config, options.ConfigFile}
 	cfgFlags = append(cfgFlags, options.Network...)
 	var cfgWithCountFlags = make([]cli.Flag, len(cfgFlags))
 	copy(cfgWithCountFlags, cfgFlags)
@@ -85,7 +85,7 @@ func NewCommands() []cli.Command {
 		{
 			Name:      "node",
 			Usage:     "start a NeoGo node",
-			UsageText: "neo-go node [--config-path path] [-d] [-p/-m/-t]",
+			UsageText: "neo-go node [--config-path path] [-d] [-p/-m/-t] [--config-file file]",
 			Action:    startServer,
 			Flags:     cfgFlags,
 		},
@@ -96,21 +96,21 @@ func NewCommands() []cli.Command {
 				{
 					Name:      "dump",
 					Usage:     "dump blocks (starting with block #1) to the file",
-					UsageText: "neo-go db dump -o file [-s start] [-c count] [--config-path path] [-p/-m/-t]",
+					UsageText: "neo-go db dump -o file [-s start] [-c count] [--config-path path] [-p/-m/-t] [--config-file file]",
 					Action:    dumpDB,
 					Flags:     cfgCountOutFlags,
 				},
 				{
 					Name:      "restore",
 					Usage:     "restore blocks from the file",
-					UsageText: "neo-go db restore -i file [--dump] [-n] [-c count] [--config-path path] [-p/-m/-t]",
+					UsageText: "neo-go db restore -i file [--dump] [-n] [-c count] [--config-path path] [-p/-m/-t] [--config-file file]",
 					Action:    restoreDB,
 					Flags:     cfgCountInFlags,
 				},
 				{
 					Name:      "reset",
 					Usage:     "reset database to the previous state",
-					UsageText: "neo-go db reset --height height [--config-path path] [-p/-m/-t]",
+					UsageText: "neo-go db reset --height height [--config-path path] [-p/-m/-t] [--config-file file]",
 					Action:    resetDB,
 					Flags:     cfgHeightFlags,
 				},

cli/server/server_test.go

@@ -30,6 +30,7 @@ func init() {
 }
 
 func TestGetConfigFromContext(t *testing.T) {
+	t.Run("config-path", func(t *testing.T) {
 		set := flag.NewFlagSet("flagSet", flag.ExitOnError)
 		set.String("config-path", "../../config", "")
 		set.Bool("testnet", true, "")
@@ -37,6 +38,17 @@ func TestGetConfigFromContext(t *testing.T) {
 		cfg, err := options.GetConfigFromContext(ctx)
 		require.NoError(t, err)
 		require.Equal(t, netmode.TestNet, cfg.ProtocolConfiguration.Magic)
+	})
+	t.Run("config-file", func(t *testing.T) {
+		set := flag.NewFlagSet("flagSet", flag.ExitOnError)
+		set.String("config-path", "../../config", "")
+		set.Bool("testnet", true, "")
+		set.String("config-file", "../../config/protocol.testnet.yml", "")
+		ctx := cli.NewContext(cli.NewApp(), set, nil)
+		cfg, err := options.GetConfigFromContext(ctx)
+		require.NoError(t, err)
+		require.Equal(t, netmode.TestNet, cfg.ProtocolConfiguration.Magic)
+	})
 }
 
 func TestHandleLoggingParams(t *testing.T) {

cli/vm/vm.go

@@ -13,7 +13,7 @@ import (
 
 // NewCommands returns 'vm' command.
 func NewCommands() []cli.Command {
-	cfgFlags := []cli.Flag{options.Config}
+	cfgFlags := []cli.Flag{options.Config, options.ConfigFile}
 	cfgFlags = append(cfgFlags, options.Network...)
 	return []cli.Command{{
 		Name:   "vm",

docs/cli.md

@@ -35,6 +35,10 @@ If you want to use some non-default configuration directory path, specify
 
 The file loaded is chosen automatically depending on network mode flag.
 
+Or just provide path to the configuration file using `--config-file` flag:
+
+`./bin/neo-go node --config-file /user/yourConfigPath/yourConfigFile.yml`
+
 Refer to the [node configuration documentation](./node-configuration.md) for
 detailed configuration file description.