Extract hard-coded dcrdata urls from GUI code. (#328)

dcrdata URLs are moved into `params.go` with the other hard-coded, network-specific values.

This change also removes the `dcrpool/gui` dependency on `dcrd/chaincfg` by updating `Config` to accept just the network name, rather than the `chaincfg.Params` struct.

dcrpool.go

@@ -99,7 +99,8 @@ func newPool(db pool.Database, cfg *config) (*miningPool, error) {
 		Domain:                cfg.Domain,
 		TLSCertFile:           cfg.GUITLSCert,
 		TLSKeyFile:            cfg.GUITLSKey,
-		ActiveNet:             cfg.net.Params,
+		ActiveNetName:         cfg.net.Params.Name,
+		BlockExplorerURL:      cfg.net.BlockExplorerURL,
 		PaymentMethod:         cfg.PaymentMethod,
 		Designation:           cfg.Designation,
 		PoolFee:               cfg.PoolFee,

gui/admin.go

@@ -66,7 +66,7 @@ func (ui *GUI) adminPage(w http.ResponseWriter, r *http.Request) {
 			LastPaymentHeight: lastPaymentHeight,
 			PoolHashRate:      ui.cache.getPoolHash(),
 			PaymentMethod:     ui.cfg.PaymentMethod,
-			Network:           ui.cfg.ActiveNet.Name,
+			Network:           ui.cfg.ActiveNetName,
 			PoolFee:           ui.cfg.PoolFee,
 			SoloPool:          ui.cfg.SoloPool,
 		},

gui/gui.go

@@ -22,7 +22,6 @@ import (
 	"github.com/gorilla/mux"
 	"github.com/gorilla/sessions"
 
-	"github.com/decred/dcrd/chaincfg/v3"
 	"github.com/decred/dcrpool/pool"
 )
 
@@ -51,8 +50,8 @@ type Config struct {
 	NoGUITLS bool
 	// Domain represents the domain name of the pool.
 	Domain string
-	// ActiveNet represents the active network being mined on.
-	ActiveNet *chaincfg.Params
+	// ActiveNetName is the name of the active network being mined on.
+	ActiveNetName string
 	// BlockExplorerURL represents the active network block explorer.
 	BlockExplorerURL string
 	// Designation represents the codename of the pool.
@@ -187,15 +186,6 @@ func NewGUI(cfg *Config) (*GUI, error) {
 		limiter: pool.NewRateLimiter(),
 	}
 
-	switch cfg.ActiveNet.Name {
-	case chaincfg.TestNet3Params().Name:
-		ui.cfg.BlockExplorerURL = "https://testnet.dcrdata.org"
-	case chaincfg.SimNetParams().Name:
-		ui.cfg.BlockExplorerURL = "..."
-	default:
-		ui.cfg.BlockExplorerURL = "https://dcrdata.decred.org"
-	}
-
 	ui.cookieStore = sessions.NewCookieStore(cfg.CSRFSecret)
 	ui.websocketServer = NewWebsocketServer()
 

gui/index.go

@@ -62,7 +62,7 @@ func (ui *GUI) renderIndex(w http.ResponseWriter, r *http.Request, modalError st
 			LastPaymentHeight: lastPaymentHeight,
 			PoolHashRate:      ui.cache.getPoolHash(),
 			PaymentMethod:     ui.cfg.PaymentMethod,
-			Network:           ui.cfg.ActiveNet.Name,
+			Network:           ui.cfg.ActiveNetName,
 			PoolFee:           ui.cfg.PoolFee,
 			SoloPool:          ui.cfg.SoloPool,
 		},

params.go

@@ -12,22 +12,26 @@ type params struct {
 	*chaincfg.Params
 	DcrdRPCServerPort    string
 	WalletGRPCServerPort string
+	BlockExplorerURL     string
 }
 
 var mainNetParams = params{
 	Params:               chaincfg.MainNetParams(),
 	DcrdRPCServerPort:    "9109",
 	WalletGRPCServerPort: "9111",
+	BlockExplorerURL:     "https://dcrdata.decred.org",
 }
 
 var testNet3Params = params{
 	Params:               chaincfg.TestNet3Params(),
 	DcrdRPCServerPort:    "19109",
 	WalletGRPCServerPort: "19111",
+	BlockExplorerURL:     "https://testnet.dcrdata.org",
 }
 
 var simNetParams = params{
 	Params:               chaincfg.SimNetParams(),
 	DcrdRPCServerPort:    "19556",
 	WalletGRPCServerPort: "19558",
+	BlockExplorerURL:     "...",
 }