client: add Quorum option in getOption

client/keys.go

@@ -194,6 +194,11 @@ type GetOptions struct {
 	// not be sorted and the ordering used should not be considered
 	// predictable.
 	Sort bool
+
+	// Quorum specifies whether it gets the latest committed value that
+	// has been applied in quorum of members, which ensures external
+	// consistency (or linearizability).
+	Quorum bool
 }
 
 type DeleteOptions struct {
@@ -378,6 +383,7 @@ func (k *httpKeysAPI) Get(ctx context.Context, key string, opts *GetOptions) (*R
 	if opts != nil {
 		act.Recursive = opts.Recursive
 		act.Sorted = opts.Sort
+		act.Quorum = opts.Quorum
 	}
 
 	resp, body, err := k.client.Do(ctx, act)
@@ -442,6 +448,7 @@ type getAction struct {
 	Key       string
 	Recursive bool
 	Sorted    bool
+	Quorum    bool
 }
 
 func (g *getAction) HTTPRequest(ep url.URL) *http.Request {
@@ -450,6 +457,7 @@ func (g *getAction) HTTPRequest(ep url.URL) *http.Request {
 	params := u.Query()
 	params.Set("recursive", strconv.FormatBool(g.Recursive))
 	params.Set("sorted", strconv.FormatBool(g.Sorted))
+	params.Set("quorum", strconv.FormatBool(g.Quorum))
 	u.RawQuery = params.Encode()
 
 	req, _ := http.NewRequest("GET", u.String(), nil)

client/keys_test.go

@@ -102,27 +102,38 @@ func TestGetAction(t *testing.T) {
 	tests := []struct {
 		recursive bool
 		sorted    bool
+		quorum    bool
 		wantQuery string
 	}{
 		{
 			recursive: false,
 			sorted:    false,
-			wantQuery: "recursive=false&sorted=false",
+			quorum:    false,
+			wantQuery: "quorum=false&recursive=false&sorted=false",
 		},
 		{
 			recursive: true,
 			sorted:    false,
-			wantQuery: "recursive=true&sorted=false",
+			quorum:    false,
+			wantQuery: "quorum=false&recursive=true&sorted=false",
 		},
 		{
 			recursive: false,
 			sorted:    true,
-			wantQuery: "recursive=false&sorted=true",
+			quorum:    false,
+			wantQuery: "quorum=false&recursive=false&sorted=true",
 		},
 		{
 			recursive: true,
 			sorted:    true,
-			wantQuery: "recursive=true&sorted=true",
+			quorum:    false,
+			wantQuery: "quorum=false&recursive=true&sorted=true",
+		},
+		{
+			recursive: false,
+			sorted:    false,
+			quorum:    true,
+			wantQuery: "quorum=true&recursive=false&sorted=false",
 		},
 	}
 
@@ -131,6 +142,7 @@ func TestGetAction(t *testing.T) {
 			Key:       "/foo/bar",
 			Recursive: tt.recursive,
 			Sorted:    tt.sorted,
+			Quorum:    tt.quorum,
 		}
 		got := *f.HTTPRequest(ep)
 
@@ -1120,11 +1132,13 @@ func TestHTTPKeysAPIGetAction(t *testing.T) {
 			opts: &GetOptions{
 				Sort:      true,
 				Recursive: true,
+				Quorum:    true,
 			},
 			wantAction: &getAction{
 				Key:       "/foo",
 				Sorted:    true,
 				Recursive: true,
+				Quorum:    true,
 			},
 		},
 	}