jsonrpc: Respect configured VSPMaxFee.

Don't override with a hard-coded value of 0.2e8.

config.go

@@ -57,6 +57,7 @@ const (
 	defaultDisableCoinTypeUpgrades = false
 	defaultCircuitLimit            = 32
 	defaultMixSplitLimit           = 10
+	defaultVSPMaxFee               = dcrutil.Amount(0.2e8)
 
 	// ticket buyer options
 	defaultBalanceToMaintainAbsolute = 0
@@ -378,7 +379,7 @@ func loadConfig(ctx context.Context) (*config, []string, error) {
 		},
 
 		VSPOpts: vspOptions{
-			MaxFee: cfgutil.NewAmountFlag(0.2e8),
+			MaxFee: cfgutil.NewAmountFlag(defaultVSPMaxFee),
 		},
 	}
 

internal/rpc/jsonrpc/config.go

@@ -7,6 +7,8 @@ package jsonrpc
 import (
 	"context"
 	"net"
+
+	"github.com/decred/dcrd/dcrutil/v4"
 )
 
 // Options contains the required options for running the legacy RPC server.
@@ -26,5 +28,6 @@ type Options struct {
 
 	VSPHost   string
 	VSPPubKey string
+	VSPMaxFee dcrutil.Amount
 	Dial      func(ctx context.Context, network, addr string) (net.Conn, error)
 }

internal/rpc/jsonrpc/methods.go

@@ -3423,12 +3423,11 @@ func (s *Server) purchaseTicket(ctx context.Context, icmd interface{}) (interfac
 		}
 	}
 
-	var vspHost string
-	var vspPubKey string
 	var vspClient *vsp.Client
 	if s.cfg.VSPHost != "" || s.cfg.VSPPubKey != "" {
-		vspHost = s.cfg.VSPHost
-		vspPubKey = s.cfg.VSPPubKey
+		vspHost := s.cfg.VSPHost
+		vspPubKey := s.cfg.VSPPubKey
+		vspMaxFee := s.cfg.VSPMaxFee
 		if vspPubKey == "" {
 			return nil, rpcErrorf(dcrjson.ErrRPCInvalidParameter,
 				"vsp pubkey can not be null")
@@ -3437,13 +3436,17 @@ func (s *Server) purchaseTicket(ctx context.Context, icmd interface{}) (interfac
 			return nil, rpcErrorf(dcrjson.ErrRPCInvalidParameter,
 				"vsp host can not be null")
 		}
+		if vspMaxFee == 0 {
+			return nil, rpcErrorf(dcrjson.ErrRPCInvalidParameter,
+				"vsp max fee must be greater than zero")
+		}
 		cfg := vsp.Config{
 			URL:    vspHost,
 			PubKey: vspPubKey,
 			Dialer: s.cfg.Dial,
 			Wallet: w,
 			Policy: vsp.Policy{
-				MaxFee:     0.2e8,
+				MaxFee:     vspMaxFee,
 				FeeAcct:    account,
 				ChangeAcct: changeAccount,
 			},

rpcserver.go

@@ -373,6 +373,7 @@ func startRPCServers(walletLoader *loader.Loader) (*grpc.Server, *jsonrpc.Server
 			MixChangeAccount:    cfg.ChangeAccount,
 			VSPHost:             cfg.VSPOpts.URL,
 			VSPPubKey:           cfg.VSPOpts.PubKey,
+			VSPMaxFee:           cfg.VSPOpts.MaxFee.Amount,
 			TicketSplitAccount:  cfg.TicketSplitAccount,
 			Dial:                cfg.dial,
 		}