vspd/main.go
2020-06-08 12:27:45 +00:00

114 lines
3.3 KiB
Go

package main
import (
"context"
"errors"
"fmt"
"os"
"sync"
"github.com/decred/vspd/background"
"github.com/decred/vspd/database"
"github.com/decred/vspd/rpc"
"github.com/decred/vspd/webapi"
)
func main() {
// Create a context that is cancelled when a shutdown request is received
// through an interrupt signal.
ctx := withShutdownCancel(context.Background())
go shutdownListener()
// Run until error is returned, or shutdown is requested.
if err := run(ctx); err != nil && !errors.Is(err, context.Canceled) {
os.Exit(1)
}
}
// run is the main startup and teardown logic performed by the main package. It
// is responsible for parsing the config, creating a dcrwallet RPC client,
// opening the database, starting the webserver, and stopping all started
// services when the context is cancelled.
func run(ctx context.Context) error {
// Load config file and parse CLI args.
cfg, err := loadConfig()
if err != nil {
// Don't use logger here because it may not be initialized.
fmt.Fprintf(os.Stderr, "Config error: %v\n", err)
return err
}
if cfg.VspClosed {
log.Warnf("Config --vspclosed is set. This will prevent vspd from " +
"accepting new tickets.")
}
// Waitgroup for services to signal when they have shutdown cleanly.
var shutdownWg sync.WaitGroup
defer log.Info("Shutdown complete")
// Open database.
db, err := database.Open(ctx, &shutdownWg, cfg.dbPath, cfg.BackupInterval)
if err != nil {
log.Errorf("Database error: %v", err)
requestShutdown()
shutdownWg.Wait()
return err
}
// Create RPC client for local dcrd instance (used for broadcasting and
// checking the status of fee transactions).
dcrd := rpc.SetupDcrd(ctx, &shutdownWg, cfg.DcrdUser, cfg.DcrdPass,
cfg.DcrdHost, cfg.dcrdCert, nil)
// Dial once just to validate config.
_, err = dcrd.Client(ctx, cfg.netParams.Params)
if err != nil {
log.Error(err)
requestShutdown()
shutdownWg.Wait()
return err
}
// Create RPC client for remote dcrwallet instance (used for voting).
wallets := rpc.SetupWallet(ctx, &shutdownWg, cfg.WalletUser, cfg.WalletPass,
cfg.WalletHosts, cfg.walletCert)
// Dial once just to validate config.
_, failedConnections := wallets.Clients(ctx, cfg.netParams.Params)
if failedConnections > 0 {
log.Errorf("Failed RPC connection on %d of %d voting wallets", failedConnections, len(cfg.WalletHosts))
requestShutdown()
shutdownWg.Wait()
return err
}
// Create and start webapi server.
apiCfg := webapi.Config{
VSPFee: cfg.VSPFee,
NetParams: cfg.netParams.Params,
SupportEmail: cfg.SupportEmail,
VspClosed: cfg.VspClosed,
}
err = webapi.Start(ctx, shutdownRequestChannel, &shutdownWg, cfg.Listen, db,
dcrd, wallets, cfg.WebServerDebug, apiCfg)
if err != nil {
log.Errorf("Failed to initialize webapi: %v", err)
requestShutdown()
shutdownWg.Wait()
return err
}
// Create a dcrd client with a blockconnected notification handler.
dcrdWithNotifs := rpc.SetupDcrd(ctx, &shutdownWg, cfg.DcrdUser, cfg.DcrdPass,
cfg.DcrdHost, cfg.dcrdCert, &background.NotificationHandler{})
// Start background process which will continually attempt to reconnect to
// dcrd if the connection drops.
background.Start(ctx, db, dcrd, dcrdWithNotifs, wallets, cfg.netParams.Params)
// Wait for shutdown tasks to complete before returning.
shutdownWg.Wait()
return ctx.Err()
}