Upgrade to new go errors and some minor fixes and improvements including easier debugging of invalid routes and e.t.c.

Former-commit-id: 5809157b952ccc61a67a9861470774b3a6fee024

core/netutil/tcp.go

@@ -2,12 +2,13 @@ package netutil
 
 import (
 	"crypto/tls"
+	"errors"
+	"fmt"
 	"net"
 	"os"
 	"strings"
 	"time"
 
-	"github.com/kataras/iris/core/errors"
 	"golang.org/x/crypto/acme/autocert"
 )
 
@@ -32,14 +33,6 @@ func (l tcpKeepAliveListener) Accept() (c net.Conn, err error) {
 	return tc, nil
 }
 
-var (
-	errPortAlreadyUsed = errors.New("port is already used")
-	errRemoveUnix      = errors.New("unexpected error when trying to remove unix socket file. Addr: %s | Trace: %s")
-	errChmod           = errors.New("cannot chmod %#o for %q: %s")
-	errCertKeyMissing  = errors.New("you should provide certFile and keyFile for TLS/SSL")
-	errParseTLS        = errors.New("couldn't load TLS, certFile=%q, keyFile=%q. Trace: %s")
-)
-
 // TCP returns a new tcp(ipv6 if supported by network) and an error on failure.
 func TCP(addr string) (net.Listener, error) {
 	l, err := net.Listen("tcp", addr)
@@ -68,16 +61,16 @@ func TCPKeepAlive(addr string) (ln net.Listener, err error) {
 // UNIX returns a new unix(file) Listener.
 func UNIX(socketFile string, mode os.FileMode) (net.Listener, error) {
 	if errOs := os.Remove(socketFile); errOs != nil && !os.IsNotExist(errOs) {
-		return nil, errRemoveUnix.Format(socketFile, errOs.Error())
+		return nil, fmt.Errorf("%s: %w", socketFile, errOs)
 	}
 
 	l, err := net.Listen("unix", socketFile)
 	if err != nil {
-		return nil, errPortAlreadyUsed.AppendErr(err)
+		return nil, fmt.Errorf("port already in use: %w", err)
 	}
 
 	if err = os.Chmod(socketFile, mode); err != nil {
-		return nil, errChmod.Format(mode, socketFile, err.Error())
+		return nil, fmt.Errorf("cannot chmod %#o for %q: %w", mode, socketFile, err)
 	}
 
 	return l, nil
@@ -86,12 +79,12 @@ func UNIX(socketFile string, mode os.FileMode) (net.Listener, error) {
 // TLS returns a new TLS Listener and an error on failure.
 func TLS(addr, certFile, keyFile string) (net.Listener, error) {
 	if certFile == "" || keyFile == "" {
-		return nil, errCertKeyMissing
+		return nil, errors.New("empty certFile or KeyFile")
 	}
 
 	cert, err := tls.LoadX509KeyPair(certFile, keyFile)
 	if err != nil {
-		return nil, errParseTLS.Format(certFile, keyFile, err)
+		return nil, err
 	}
 
 	return CERT(addr, cert)