connect: add fix for long socket paths

Now relative path is used instead of real for console socket.
It is used to prevent console socket path from being too long.

Closes #124

cli/connector/connector.go

@@ -3,6 +3,8 @@ package connector
 import (
 	"fmt"
 	"net"
+	"os"
+	"path/filepath"
 	"time"
 
 	"github.com/tarantool/go-tarantool"
@@ -37,6 +39,23 @@ type Connector interface {
 
 // Connect connects to the tarantool instance according to options.
 func Connect(opts ConnectOpts) (Connector, error) {
+	// It became common that address is longer than 108 symbols(sun_path limit).
+	// To reduce length of address we use relative path
+	// with chdir into a directory of socket.
+	// e.g foo/bar/123.sock -> ./123.sock
+	workDir, err := os.Getwd()
+	if err != nil {
+		return nil, err
+	}
+	if _, err := os.Stat(opts.Address); err == nil {
+		if len(opts.Address) > 108 {
+			return nil, fmt.Errorf("socket name is longer than 106 symbols: %s",
+				filepath.Base(opts.Address))
+		}
+		os.Chdir(filepath.Dir(opts.Address))
+		opts.Address = "./" + filepath.Base(opts.Address)
+		defer os.Chdir(workDir)
+	}
 	// Connect to specified address.
 	greetingConn, err := net.Dial(opts.Network, opts.Address)
 	if err != nil {
@@ -65,8 +84,8 @@ func Connect(opts ConnectOpts) (Connector, error) {
 
 		addr := fmt.Sprintf("%s://%s", opts.Network, opts.Address)
 		conn, err := tarantool.Connect(addr, tarantool.Opts{
-			User: opts.Username,
-			Pass: opts.Password,
+			User:       opts.Username,
+			Pass:       opts.Password,
 			SkipSchema: true, // We don't need a schema for eval requests.
 		})
 		if err != nil {