From 5bdcd4c241ed7e09811ce98e22e950d398220175 Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 21 Jul 2021 12:19:55 +0300
Subject: [PATCH 1/2] client: add GetCandidateRegisterPrice method

It's important for clients.
---
 pkg/rpc/client/native.go   | 11 ++++++++++-
 pkg/rpc/client/rpc_test.go | 12 ++++++++++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/pkg/rpc/client/native.go b/pkg/rpc/client/native.go
index 6081d1175..bfbed495e 100644
--- a/pkg/rpc/client/native.go
+++ b/pkg/rpc/client/native.go
@@ -30,11 +30,20 @@ func (c *Client) GetNNSPrice(nnsHash util.Uint160) (int64, error) {
 
 // GetGasPerBlock invokes `getGasPerBlock` method on a native NEO contract.
 func (c *Client) GetGasPerBlock() (int64, error) {
+	return c.getFromNEO("getGasPerBlock")
+}
+
+// GetCandidateRegisterPrice invokes `getRegisterPrice` method on native NEO contract.
+func (c *Client) GetCandidateRegisterPrice() (int64, error) {
+	return c.getFromNEO("getRegisterPrice")
+}
+
+func (c *Client) getFromNEO(meth string) (int64, error) {
 	neoHash, err := c.GetNativeContractHash(nativenames.Neo)
 	if err != nil {
 		return 0, fmt.Errorf("failed to get native NEO hash: %w", err)
 	}
-	return c.invokeNativeGetMethod(neoHash, "getGasPerBlock")
+	return c.invokeNativeGetMethod(neoHash, meth)
 }
 
 // GetDesignatedByRole invokes `getDesignatedByRole` method on a native RoleManagement contract.
diff --git a/pkg/rpc/client/rpc_test.go b/pkg/rpc/client/rpc_test.go
index c33f37497..55fff2543 100644
--- a/pkg/rpc/client/rpc_test.go
+++ b/pkg/rpc/client/rpc_test.go
@@ -478,6 +478,18 @@ var rpcClientTestCases = map[string][]rpcClientTestCase{
 			},
 		},
 	},
+	"getCandidateRegisterPrice": {
+		{
+			name: "positive",
+			invoke: func(c *Client) (interface{}, error) {
+				return c.GetCandidateRegisterPrice()
+			},
+			serverResponse: `{"id":1,"jsonrpc":"2.0","result":{"state":"HALT","gasconsumed":"2007390","script":"EMAMDWdldEZlZVBlckJ5dGUMFJphpG7sl7iTBtfOgfFbRiCR0AkyQWJ9W1I=","stack":[{"type":"Integer","value":"100000000000"}],"tx":null}}`,
+			result: func(c *Client) interface{} {
+				return int64(100000000000)
+			},
+		},
+	},
 	"getDesignatedByRole": {
 		{
 			name: "positive",

From 5fbb60a9ed012b55c11c5d1d440aa246efc7fd4b Mon Sep 17 00:00:00 2001
From: Roman Khimov <roman@nspcc.ru>
Date: Wed, 21 Jul 2021 12:25:42 +0300
Subject: [PATCH 2/2] cli/wallet: request candidate registration price

Hardcoding 1000 is wrong. Inspired by neo-project/neo-node#788.
---
 cli/wallet/validator.go | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/cli/wallet/validator.go b/cli/wallet/validator.go
index cee1ffaf4..0289ae47c 100644
--- a/cli/wallet/validator.go
+++ b/cli/wallet/validator.go
@@ -90,7 +90,7 @@ func newValidatorCommands() []cli.Command {
 }
 
 func handleRegister(ctx *cli.Context) error {
-	return handleCandidate(ctx, "registerCandidate", 1001*100000000) // registering costs 1000 GAS
+	return handleCandidate(ctx, "registerCandidate", 100000000) // 1 additional GAS.
 }
 
 func handleUnregister(ctx *cli.Context) error {
@@ -122,6 +122,14 @@ func handleCandidate(ctx *cli.Context, method string, sysGas int64) error {
 		return cli.NewExitError(err, 1)
 	}
 
+	if sysGas >= 0 {
+		regPrice, err := c.GetCandidateRegisterPrice()
+		if err != nil {
+			return cli.NewExitError(err, 1)
+		}
+		sysGas += regPrice
+	}
+
 	gas := flags.Fixed8FromContext(ctx, "gas")
 	neoContractHash, err := c.GetNativeContractHash(nativenames.Neo)
 	if err != nil {