vspd: Create essential resources in main run func.

Creating the essential DB/RPC resources which are required for both
webapi and vspd in the main func allows the two components to be
decoupled.

cmd/vspd/main.go

@@ -9,8 +9,11 @@ import (
 	"os"
 	"runtime"
 
+	"github.com/decred/dcrd/wire"
+	"github.com/decred/vspd/database"
 	"github.com/decred/vspd/internal/config"
 	"github.com/decred/vspd/internal/version"
+	"github.com/decred/vspd/rpc"
 )
 
 func main() {
@@ -45,11 +48,34 @@ func run() int {
 		log.Warnf("")
 	}
 
-	vspd, err := newVspd(cfg, log)
+	// Open database.
+	db, err := database.Open(cfg.dbPath, cfg.logger(" DB"), maxVoteChangeRecords)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "newVspd error: %v\n", err)
+		log.Errorf("Failed to open database: %v", err)
 		return 1
 	}
+	const writeBackup = true
+	defer db.Close(writeBackup)
 
-	return vspd.run()
+	rpcLog := cfg.logger("RPC")
+
+	// Create a channel to receive blockConnected notifications from dcrd.
+	blockNotifChan := make(chan *wire.BlockHeader)
+
+	// Create RPC client for local dcrd instance (used for broadcasting and
+	// checking the status of fee transactions).
+	dcrd := rpc.SetupDcrd(cfg.DcrdUser, cfg.DcrdPass, cfg.DcrdHost, cfg.dcrdCert, cfg.network.Params, rpcLog, blockNotifChan)
+	defer dcrd.Close()
+
+	// Create RPC client for remote dcrwallet instances (used for voting).
+	wallets := rpc.SetupWallet(cfg.walletUsers, cfg.walletPasswords, cfg.walletHosts, cfg.walletCerts, cfg.network.Params, rpcLog)
+	defer wallets.Close()
+
+	vspd := newVspd(cfg, log, db, dcrd, wallets, blockNotifChan)
+
+	// Create a context that is canceled when a shutdown request is received
+	// through an interrupt signal.
+	ctx := shutdownListener(log)
+
+	return vspd.run(ctx)
 }

cmd/vspd/vspd.go

@@ -53,26 +53,8 @@ type vspd struct {
 	lastScannedBlock int64
 }
 
-// newVspd creates the essential resources required by vspd - a database, logger
+func newVspd(cfg *vspdConfig, log slog.Logger, db *database.VspDatabase,
-// and RPC clients - then returns an instance of vspd which is ready to be run.
+	dcrd rpc.DcrdConnect, wallets rpc.WalletConnect, blockNotifChan chan *wire.BlockHeader) *vspd {
-func newVspd(cfg *vspdConfig, log slog.Logger) (*vspd, error) {
-	// Open database.
-	db, err := database.Open(cfg.dbPath, cfg.logger(" DB"), maxVoteChangeRecords)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open database: %w", err)
-	}
-
-	rpcLog := cfg.logger("RPC")
-
-	// Create a channel to receive blockConnected notifications from dcrd.
-	blockNotifChan := make(chan *wire.BlockHeader)
-
-	// Create RPC client for local dcrd instance (used for broadcasting and
-	// checking the status of fee transactions).
-	dcrd := rpc.SetupDcrd(cfg.DcrdUser, cfg.DcrdPass, cfg.DcrdHost, cfg.dcrdCert, cfg.network.Params, rpcLog, blockNotifChan)
-
-	// Create RPC client for remote dcrwallet instances (used for voting).
-	wallets := rpc.SetupWallet(cfg.walletUsers, cfg.walletPasswords, cfg.walletHosts, cfg.walletCerts, cfg.network.Params, rpcLog)
 
 	v := &vspd{
 		cfg:     cfg,
@@ -84,22 +66,10 @@ func newVspd(cfg *vspdConfig, log slog.Logger) (*vspd, error) {
 		blockNotifChan: blockNotifChan,
 	}
 
-	return v, nil
+	return v
 }
 
-// run starts all of vspds background services including the web server, and
+func (v *vspd) run(ctx context.Context) int {
-// stops all started services when a shutdown is requested.
-func (v *vspd) run() int {
-	// Defer shutdown tasks.
-	const writeBackup = true
-	defer v.db.Close(writeBackup)
-	defer v.dcrd.Close()
-	defer v.wallets.Close()
-
-	// Create a context that is canceled when a shutdown request is received
-	// through an interrupt signal.
-	ctx := shutdownListener(v.log)
-
 	// Run database integrity checks to ensure all data in database is present
 	// and up-to-date.
 	err := v.checkDatabaseIntegrity(ctx)