config: don't set ulimit on windows

Use existing file limit mechanism

claimtrie/cmd/cmd/root.go

@@ -6,6 +6,7 @@ import (
 	"github.com/btcsuite/btclog"
 	"github.com/lbryio/lbcd/claimtrie/config"
 	"github.com/lbryio/lbcd/claimtrie/param"
+	"github.com/lbryio/lbcd/limits"
 	"github.com/lbryio/lbcd/wire"
 
 	"github.com/spf13/cobra"
@@ -51,5 +52,10 @@ func Execute() {
 	log = backendLogger.Logger("CMDL")
 	log.SetLevel(btclog.LevelDebug)
 
+	// Up some limits.
+	if err := limits.SetLimits(); err != nil {
+		log.Errorf("failed to set limits: %v\n", err)
+	}
+
 	rootCmd.Execute() // nolint : errchk
 }

claimtrie/cmd/cmd/temporal.go

@@ -31,7 +31,11 @@ func NewTemporalCommand() *cobra.Command {
 				return errors.Wrapf(err, "open temporal repo")
 			}
 
-			for ht := fromHeight; ht < toHeight; ht++ {
+			if toHeight <= 0 {
+				toHeight = fromHeight
+			}
+
+			for ht := fromHeight; ht <= toHeight; ht++ {
 				names, err := repo.NodesAt(ht)
 				if err != nil {
 					return errors.Wrapf(err, "get node names from temporal")

claimtrie/config/config.go

@@ -2,33 +2,11 @@ package config
 
 import (
 	"path/filepath"
-	"syscall"
 
 	"github.com/lbryio/lbcd/claimtrie/param"
 	btcutil "github.com/lbryio/lbcutil"
 )
 
-func init() {
-	// ensure that we have enough file handles
-	var rLimit syscall.Rlimit
-	err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
-	if err != nil {
-		panic("Error getting File Handle RLimit: " + err.Error())
-	}
-	minRequiredFileHandles := uint64(24000) // seven databases and they each require ~2000, plus a few more to be safe
-	if rLimit.Max < minRequiredFileHandles {
-		panic("Error increasing File Handle RLimit: increasing file handle limit requires " +
-			"unavailable privileges. Allow at least 24000 handles.")
-	}
-	if rLimit.Cur < minRequiredFileHandles {
-		rLimit.Cur = minRequiredFileHandles
-		err := syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
-		if err != nil {
-			panic("Error setting File Handle RLimit to 24000: " + err.Error())
-		}
-	}
-}
-
 var DefaultConfig = Config{
 	Params: param.MainNet,
 

limits/limits_unix.go

@@ -13,8 +13,8 @@ import (
 )
 
 const (
-	fileLimitWant = 2048
+	fileLimitWant = 2048 * 12
-	fileLimitMin  = 1024
+	fileLimitMin  = 2048 * 8
 )
 
 // SetLimits raises some process limits to values which allow btcd and