Fix nil pointer when CLI unable to get server version (#1223)

pkg/controller/client/client.go

@@ -18,12 +18,16 @@ package client
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"strings"
+	"time"
+
+	"golang.org/x/net/context/ctxhttp"
 
 	ferror "github.com/fission/fission/pkg/error"
 	"github.com/fission/fission/pkg/info"
@@ -94,7 +98,11 @@ func (c *Client) handleCreateResponse(resp *http.Response) ([]byte, error) {
 
 func (c *Client) ServerInfo() (*info.ServerInfo, error) {
 	url := fmt.Sprintf(c.Url)
-	resp, err := http.Get(url)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	resp, err := ctxhttp.Get(ctx, &http.Client{}, url)
 	if err != nil {
 		return nil, err
 	}

pkg/fission-cli/util/version.go

@@ -18,27 +18,30 @@ type Versions struct {
 }
 
 func GetVersion(client *client.Client) []byte {
-	serverInfo, err := client.ServerInfo()
-	if err != nil {
-		log.Warn(fmt.Sprintf("Error getting Fission API version: %v", err))
-	}
-
 	// Fetch client versions
 	versions := Versions{
 		Client: map[string]info.BuildMeta{
 			"fission/core": info.BuildInfo(),
 		},
 	}
+
 	for _, pmd := range plugin.FindAll() {
 		versions.Client[pmd.Name] = info.BuildMeta{
 			Version: pmd.Version,
 		}
 	}
 
+	serverInfo, err := client.ServerInfo()
+	if err != nil {
+		log.Warn(fmt.Sprintf("Error getting Fission API version: %v", err))
+		serverInfo = &info.ServerInfo{}
+	}
+
 	// Fetch server versions
 	versions.Server = map[string]info.BuildMeta{
 		"fission/core": serverInfo.Build,
 	}
+
 	// FUTURE: fetch versions of plugins server-side
 	bs, err := yaml.Marshal(versions)
 	if err != nil {