collect /find Info for tree and plain types consistently

MakeTree calculated Info locally for historical reasons,
and the results were consistent with the dataService.Info call
but calculated differently. Requesting plain format comments,
on the other hand, had a problem with not returning the read-only status
of the page if it doesn't have any comments yet.

That change fixes that, ensuring that Info is requested
in the same manner and the read-only status is returned correctly
in case the post doesn't have comments but has such a status.

Author: paskal

backend/app/rest/api/admin_test.go

@@ -513,6 +513,7 @@ func TestAdmin_ReadOnlyNoComments(t *testing.T) {
 	_, err = srv.DataService.Info(store.Locator{SiteID: "remark42", URL: "https://radio-t.com/blah"}, 0)
 	assert.Error(t, err)
 
+	// test format "tree"
 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	comments := commentsWithInfo{}
@@ -521,6 +522,16 @@ func TestAdmin_ReadOnlyNoComments(t *testing.T) {
 	assert.Equal(t, 0, len(comments.Comments), "should have 0 comments")
 	assert.True(t, comments.Info.ReadOnly)
 	t.Logf("%+v", comments)
+
+	// test format "plain"
+	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah")
+	assert.Equal(t, http.StatusOK, code)
+	comments = commentsWithInfo{}
+	err = json.Unmarshal([]byte(res), &comments)
+	assert.NoError(t, err)
+	assert.Equal(t, 0, len(comments.Comments), "should have 0 comments")
+	assert.True(t, comments.Info.ReadOnly)
+	t.Logf("%+v", comments)
 }
 
 func TestAdmin_ReadOnlyWithAge(t *testing.T) {

backend/app/rest/api/rest.go

@@ -97,6 +97,11 @@ type commentsWithInfo struct {
 	Info     store.PostInfo  `json:"info,omitempty"`
 }
 
+type treeWithInfo struct {
+	*service.Tree
+	Info store.PostInfo `json:"info,omitempty"`
+}
+
 // Run the lister and request's router, activate rest server
 func (s *Rest) Run(address string, port int) {
 	if address == "*" {

backend/app/rest/api/rest_public.go

@@ -77,22 +77,28 @@ func (s *public) findCommentsCtrl(w http.ResponseWriter, r *http.Request) {
 			comments = []store.Comment{} // error should clear comments and continue for post info
 		}
 		comments = s.applyView(comments, view)
+
+		var commentsInfo store.PostInfo
+		if info, ee := s.dataService.Info(locator, s.readOnlyAge); ee == nil {
+			commentsInfo = info
+		}
+		// check IsReadOnly separately for the scenario of a URL with no comments and read-only status
+		// set by admin so that Info call would return error, but read-only can be checked independently and is true
+		if commentsInfo.ReadOnly || s.dataService.IsReadOnly(locator) {
+			commentsInfo.ReadOnly = true
+		}
+
 		var b []byte
 		switch format {
 		case "tree":
-			tree := service.MakeTree(comments, sort, s.readOnlyAge)
+			tree := service.MakeTree(comments, sort)
 			if tree.Nodes == nil { // eliminate json nil serialization
 				tree.Nodes = []*service.Node{}
 			}
-			if s.dataService.IsReadOnly(locator) {
-				tree.Info.ReadOnly = true
-			}
-			b, e = encodeJSONWithHTML(tree)
+			withInfo := treeWithInfo{Tree: tree, Info: commentsInfo}
+			b, e = encodeJSONWithHTML(withInfo)
 		default:
-			withInfo := commentsWithInfo{Comments: comments}
-			if info, ee := s.dataService.Info(locator, s.readOnlyAge); ee == nil {
-				withInfo.Info = info
-			}
+			withInfo := commentsWithInfo{Comments: comments, Info: commentsInfo}
 			b, e = encodeJSONWithHTML(withInfo)
 		}
 		return b, e

backend/app/rest/api/rest_public_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"net/http/httptest"
 	"os"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -210,7 +211,7 @@ func TestRest_Find(t *testing.T) {
 	assert.Equal(t, id2, comments.Comments[0].ID)
 
 	// get in tree mode
-	tree := service.Tree{}
+	tree := treeWithInfo{}
 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
@@ -236,7 +237,7 @@ func TestRest_FindAge(t *testing.T) {
 	_, err = srv.DataService.Create(c2)
 	require.NoError(t, err)
 
-	tree := service.Tree{}
+	tree := treeWithInfo{}
 
 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
@@ -279,15 +280,15 @@ func TestRest_FindReadOnly(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, resp.Body.Close())
 
-	tree := service.Tree{}
+	tree := treeWithInfo{}
 	res, code := get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah1&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
 	require.NoError(t, err)
 	assert.Equal(t, "https://radio-t.com/blah1", tree.Info.URL)
 	assert.True(t, tree.Info.ReadOnly, "post is ro")
 
-	tree = service.Tree{}
+	tree = treeWithInfo{}
 	res, code = get(t, ts.URL+"/api/v1/find?site=remark42&url=https://radio-t.com/blah2&format=tree")
 	assert.Equal(t, http.StatusOK, code)
 	err = json.Unmarshal([]byte(res), &tree)
@@ -515,6 +516,83 @@ func TestRest_FindUserComments_CWE_918(t *testing.T) {
 	assert.Equal(t, arbitraryServer.URL, resp.Comments[0].Locator.URL, "arbitrary URL provided by the request")
 }
 
+func TestPublic_FindCommentsCtrl_ConsistentCount(t *testing.T) {
+	// test that comment counting is consistent between tree and plain formats
+	ts, srv, teardown := startupT(t)
+	defer teardown()
+
+	commentLocator := store.Locator{URL: "test-url", SiteID: "remark42"}
+
+	// Adding initial comments and voting
+	c1 := store.Comment{Text: "top-level comment 1", Locator: commentLocator}
+	id1 := addComment(t, c1, ts)
+
+	c2 := store.Comment{Text: "top-level comment 2", Locator: commentLocator}
+	id2 := addComment(t, c2, ts)
+
+	c3 := store.Comment{Text: "second-level comment 1", ParentID: id1, Locator: commentLocator}
+	id3 := addComment(t, c3, ts)
+
+	c4 := store.Comment{Text: "third-level comment 1", ParentID: id3, Locator: commentLocator}
+	_ = addComment(t, c4, ts)
+
+	c5 := store.Comment{Text: "second-level comment 2", ParentID: id2, Locator: commentLocator}
+	id5 := addComment(t, c5, ts)
+
+	c6 := store.Comment{Text: "third-level comment 2", ParentID: id5, Locator: commentLocator}
+	id6 := addComment(t, c6, ts)
+
+	c7 := store.Comment{Text: "top-level comment 3", Locator: commentLocator}
+	id7 := addComment(t, c7, ts)
+
+	c8 := store.Comment{Text: "second-level comment 3", ParentID: id7, Locator: commentLocator}
+	id8 := addComment(t, c8, ts)
+
+	err := srv.DataService.Delete(commentLocator, id8, store.SoftDelete)
+	assert.NoError(t, err)
+	err = srv.DataService.Delete(commentLocator, id6, store.HardDelete)
+	assert.NoError(t, err)
+	srv.Cache.Flush(cache.FlusherRequest{})
+
+	currentTimestamp := time.Now().Unix() * 1000 // For the "since" parameter.
+
+	testCases := []struct {
+		params       string
+		expectedBody string
+	}{
+		{"", `"info":{"url":"test-url","count":6,`},
+		{"format=plain", `"info":{"url":"test-url","count":6,`},
+		{"since=" + strconv.FormatInt(currentTimestamp-10, 10), `"info":{"url":"test-url","count":6,`},
+		{"format=plain&since=" + strconv.FormatInt(currentTimestamp-10, 10), `"info":{"url":"test-url","count":6,`},
+		{"format=plain&since=" + strconv.FormatInt(currentTimestamp-10, 10), `"info":{"url":"test-url","count":6,`},
+		{"format=tree", `"info":{"url":"test-url","count":6`},
+		{"format=tree&since=" + strconv.FormatInt(currentTimestamp-10, 10), `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=+time", `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=-score", `"info":{"url":"test-url","count":6`},
+		{"sort=+time", `"info":{"url":"test-url","count":6`},
+		{"sort=-time", `"info":{"url":"test-url","count":6`},
+		{"sort=+score", `"info":{"url":"test-url","count":6`},
+		{"sort=-score", `"info":{"url":"test-url","count":6`},
+		{"sort=+controversy", `"info":{"url":"test-url","count":6`},
+		{"sort=-controversy", `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=+time&since=" + strconv.FormatInt(currentTimestamp-10, 10), `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=-score&since=" + strconv.FormatInt(currentTimestamp-100, 10), `"info":{"url":"test-url","count":6`},
+		{"format=tree&sort=+controversy&since=" + strconv.FormatInt(currentTimestamp-1000, 10), `"info":{"url":"test-url","count":6`},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.params, func(t *testing.T) {
+			url := fmt.Sprintf(ts.URL+"/api/v1/find?site=remark42&%s", tc.params)
+			body, code := get(t, url)
+			assert.Equal(t, http.StatusOK, code)
+			assert.Contains(t, body, tc.expectedBody)
+			t.Log(body)
+			// prevent hit limiter from engaging
+			time.Sleep(30 * time.Millisecond)
+		})
+	}
+}
+
 func TestRest_UserInfo(t *testing.T) {
 	ts, _, teardown := startupT(t)
 	defer teardown()

backend/app/store/service/testdata/tree.json

@@ -242,11 +242,5 @@
                   "time": "2017-12-25T19:47:22Z"
               }
           }
-      ],
-      "info": {
-          "url": "url",
-          "count": 12,
-          "first_time": "2017-12-25T19:46:01Z",
-          "last_time": "2017-12-25T19:47:22Z"
-      }
-  }
+      ]
+  }

backend/app/store/service/testdata/tree_del.json

@@ -176,11 +176,5 @@
                  }
              }]
          }]
-     }],
-     "info": {
-         "url": "url",
-         "count": 8,
-         "first_time": "2017-12-25T19:46:01Z",
-         "last_time": "2017-12-25T19:47:05Z"
-     }
- }
+     }]
+ }

backend/app/store/service/tree.go

@@ -10,8 +10,7 @@ import (
 
 // Tree is formatter making tree from the list of comments
 type Tree struct {
-	Nodes []*Node        `json:"comments"`
-	Info  store.PostInfo `json:"info,omitempty"`
+	Nodes []*Node `json:"comments"`
 }
 
 // Node is a comment with optional replies
@@ -30,22 +29,12 @@ type recurData struct {
 }
 
 // MakeTree gets unsorted list of comments and produces Tree
-// It will make store.PostInfo by itself and will mark Info.ReadOnly based on passed readOnlyAge
-// Tree maker is local and has no access to the data store. By this reason it has to make Info and won't be able
-// to handle store's read-only status. This status should be set by caller.
-func MakeTree(comments []store.Comment, sortType string, readOnlyAge int) *Tree {
+func MakeTree(comments []store.Comment, sortType string) *Tree {
 	if len(comments) == 0 {
 		return &Tree{}
 	}
 
-	res := Tree{
-		Info: store.PostInfo{
-			URL:     comments[0].Locator.URL,
-			FirstTS: comments[0].Timestamp,
-			LastTS:  comments[0].Timestamp,
-		},
-	}
-	res.Info.Count = len(res.filter(comments, func(c store.Comment) bool { return !c.Deleted }))
+	res := Tree{}
 
 	topComments := res.filter(comments, func(c store.Comment) bool { return c.ParentID == "" })
 
@@ -54,23 +43,12 @@ func MakeTree(comments []store.Comment, sortType string, readOnlyAge int) *Tree
 		node := Node{Comment: rootComment}
 
 		rd := recurData{}
-		commentsTree, tsModified, tsCreated := res.proc(comments, &node, &rd, rootComment.ID)
+		commentsTree := res.proc(comments, &node, &rd, rootComment.ID)
 		// skip deleted with no sub-comments ar all sub-comments deleted
 		if rootComment.Deleted && (len(commentsTree.Replies) == 0 || !rd.visible) {
 			continue
 		}
 
-		commentsTree.tsModified, commentsTree.tsCreated = tsModified, tsCreated
-		if commentsTree.tsCreated.Before(res.Info.FirstTS) {
-			res.Info.FirstTS = commentsTree.tsCreated
-		}
-		if commentsTree.tsModified.After(res.Info.LastTS) {
-			res.Info.LastTS = commentsTree.tsModified
-		}
-
-		res.Info.ReadOnly = readOnlyAge > 0 && !res.Info.FirstTS.IsZero() &&
-			res.Info.FirstTS.AddDate(0, 0, readOnlyAge).Before(time.Now())
-
 		res.Nodes = append(res.Nodes, commentsTree)
 	}
 
@@ -79,7 +57,7 @@ func MakeTree(comments []store.Comment, sortType string, readOnlyAge int) *Tree
 }
 
 // proc makes tree for one top-level comment recursively
-func (t *Tree) proc(comments []store.Comment, node *Node, rd *recurData, parentID string) (result *Node, modified, created time.Time) {
+func (t *Tree) proc(comments []store.Comment, node *Node, rd *recurData, parentID string) (result *Node) {
 	if rd.tsModified.IsZero() || rd.tsCreated.IsZero() {
 		rd.tsModified, rd.tsCreated = node.Comment.Timestamp, node.Comment.Timestamp
 	}
@@ -106,7 +84,8 @@ func (t *Tree) proc(comments []store.Comment, node *Node, rd *recurData, parentI
 	sort.Slice(node.Replies, func(i, j int) bool {
 		return node.Replies[i].Comment.Timestamp.Before(node.Replies[j].Comment.Timestamp)
 	})
-	return node, rd.tsModified, rd.tsCreated
+	node.tsModified, node.tsCreated = rd.tsModified, rd.tsCreated
+	return node
 }
 
 // filter returns comments for parentID