mirror of
https://github.com/superseriousbusiness/gotosocial.git
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Improve context descendant sorting (#2579)
* Improve context descendant sorting Topologically sort replies, then move self-replies to top of list * Unify descendant sort passes * Correct test package name * Preallocate maps
This commit is contained in:
Vyr Cossont
GitHub
parent
c9452f32f3
commit
c675d47a8c
@ -19,7 +19,8 @@
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import (
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"context"
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"sort"
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"slices"
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"strings"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/gtserror"
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@ -74,27 +75,23 @@ func (p *Processor) contextGet(
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return nil, errWithCode
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}
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context := &apimodel.Context{
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Ancestors: []apimodel.Status{},
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Descendants: []apimodel.Status{},
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}
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parents, err := p.state.DB.GetStatusParents(ctx, targetStatus)
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if err != nil {
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return nil, gtserror.NewErrorInternalError(err)
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}
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var ancestors []*apimodel.Status
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for _, status := range parents {
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if v, err := p.filter.StatusVisible(ctx, requestingAccount, status); err == nil && v {
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apiStatus, err := convert(ctx, status, requestingAccount)
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if err == nil {
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context.Ancestors = append(context.Ancestors, *apiStatus)
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ancestors = append(ancestors, apiStatus)
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}
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}
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}
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sort.Slice(context.Ancestors, func(i int, j int) bool {
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return context.Ancestors[i].ID < context.Ancestors[j].ID
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slices.SortFunc(ancestors, func(lhs, rhs *apimodel.Status) int {
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return strings.Compare(lhs.ID, rhs.ID)
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})
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children, err := p.state.DB.GetStatusChildren(ctx, targetStatus.ID)
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@ -102,18 +99,116 @@ func (p *Processor) contextGet(
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return nil, gtserror.NewErrorInternalError(err)
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}
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var descendants []*apimodel.Status
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for _, status := range children {
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if v, err := p.filter.StatusVisible(ctx, requestingAccount, status); err == nil && v {
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apiStatus, err := convert(ctx, status, requestingAccount)
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if err == nil {
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context.Descendants = append(context.Descendants, *apiStatus)
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descendants = append(descendants, apiStatus)
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}
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}
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}
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TopoSort(descendants, targetStatus.AccountID)
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//goland:noinspection GoImportUsedAsName
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context := &apimodel.Context{
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Ancestors: make([]apimodel.Status, 0, len(ancestors)),
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Descendants: make([]apimodel.Status, 0, len(descendants)),
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}
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for _, ancestor := range ancestors {
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context.Ancestors = append(context.Ancestors, *ancestor)
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}
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for _, descendant := range descendants {
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context.Descendants = append(context.Descendants, *descendant)
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}
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return context, nil
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}
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// TopoSort sorts statuses topologically, by self-reply, and by ID.
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// Can handle cycles but the output order will be arbitrary.
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// (But if there are cycles, something went wrong upstream.)
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func TopoSort(apiStatuses []*apimodel.Status, targetAccountID string) {
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if len(apiStatuses) == 0 {
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return
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}
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// Map of status IDs to statuses.
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lookup := make(map[string]*apimodel.Status, len(apiStatuses))
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for _, apiStatus := range apiStatuses {
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lookup[apiStatus.ID] = apiStatus
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}
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// Tree of statuses to their children.
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// The nil status may have children: any who don't have a parent, or whose parent isn't in the input.
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tree := make(map[*apimodel.Status][]*apimodel.Status, len(apiStatuses))
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for _, apiStatus := range apiStatuses {
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var parent *apimodel.Status
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if apiStatus.InReplyToID != nil {
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parent = lookup[*apiStatus.InReplyToID]
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}
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tree[parent] = append(tree[parent], apiStatus)
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}
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// Sort children of each status by self-reply status and then ID, *in reverse*.
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isSelfReply := func(apiStatus *apimodel.Status) bool {
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return apiStatus.GetAccountID() == targetAccountID &&
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apiStatus.InReplyToAccountID != nil &&
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*apiStatus.InReplyToAccountID == targetAccountID
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}
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for id, children := range tree {
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slices.SortFunc(children, func(lhs, rhs *apimodel.Status) int {
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lhsIsContextSelfReply := isSelfReply(lhs)
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rhsIsContextSelfReply := isSelfReply(rhs)
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if lhsIsContextSelfReply && !rhsIsContextSelfReply {
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return 1
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} else if !lhsIsContextSelfReply && rhsIsContextSelfReply {
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return -1
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}
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return -strings.Compare(lhs.ID, rhs.ID)
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})
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tree[id] = children
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}
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// Traverse the tree using preorder depth-first search, topologically sorting the statuses.
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stack := make([]*apimodel.Status, 1, len(tree))
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apiStatusIndex := 0
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for len(stack) > 0 {
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parent := stack[len(stack)-1]
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children := tree[parent]
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if len(children) == 0 {
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// Remove this node from the tree.
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delete(tree, parent)
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// Go back to this node's parent.
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stack = stack[:len(stack)-1]
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continue
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}
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// Remove the last child entry (the first in sorted order).
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child := children[len(children)-1]
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tree[parent] = children[:len(children)-1]
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// Explore its children next.
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stack = append(stack, child)
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// Overwrite the next entry of the input slice.
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apiStatuses[apiStatusIndex] = child
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apiStatusIndex++
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}
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// There should only be nodes left in the tree in the event of a cycle.
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// Append them to the end in arbitrary order.
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// This ensures that the slice of statuses has no duplicates.
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for node := range tree {
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apiStatuses[apiStatusIndex] = node
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apiStatusIndex++
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}
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}
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// ContextGet returns the context (previous and following posts) from the given status ID.
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func (p *Processor) ContextGet(ctx context.Context, requestingAccount *gtsmodel.Account, targetStatusID string) (*apimodel.Context, gtserror.WithCode) {
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return p.contextGet(ctx, requestingAccount, targetStatusID, p.converter.StatusToAPIStatus)
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197
internal/processing/status/get_test.go
Normal file
197
internal/processing/status/get_test.go
Normal file
@ -0,0 +1,197 @@
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// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package status_test
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import (
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"github.com/stretchr/testify/suite"
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apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
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"github.com/superseriousbusiness/gotosocial/internal/processing/status"
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"testing"
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)
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type topoSortTestSuite struct {
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suite.Suite
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}
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func statusIDs(apiStatuses []*apimodel.Status) []string {
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ids := make([]string, 0, len(apiStatuses))
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for _, apiStatus := range apiStatuses {
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ids = append(ids, apiStatus.ID)
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}
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return ids
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}
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func (suite *topoSortTestSuite) TestBranched() {
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// https://commons.wikimedia.org/wiki/File:Sorted_binary_tree_ALL_RGB.svg
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f := &apimodel.Status{ID: "F"}
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b := &apimodel.Status{ID: "B", InReplyToID: &f.ID}
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a := &apimodel.Status{ID: "A", InReplyToID: &b.ID}
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d := &apimodel.Status{ID: "D", InReplyToID: &b.ID}
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c := &apimodel.Status{ID: "C", InReplyToID: &d.ID}
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e := &apimodel.Status{ID: "E", InReplyToID: &d.ID}
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g := &apimodel.Status{ID: "G", InReplyToID: &f.ID}
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i := &apimodel.Status{ID: "I", InReplyToID: &g.ID}
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h := &apimodel.Status{ID: "H", InReplyToID: &i.ID}
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expected := statusIDs([]*apimodel.Status{f, b, a, d, c, e, g, i, h})
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list := []*apimodel.Status{a, b, c, d, e, f, g, h, i}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.Equal(expected, actual)
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}
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func (suite *topoSortTestSuite) TestBranchedWithSelfReplyChain() {
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targetAccount := &apimodel.Account{ID: "1"}
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otherAccount := &apimodel.Account{ID: "2"}
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f := &apimodel.Status{
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ID: "F",
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Account: targetAccount,
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}
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b := &apimodel.Status{
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ID: "B",
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Account: targetAccount,
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InReplyToID: &f.ID,
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InReplyToAccountID: &f.Account.ID,
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}
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a := &apimodel.Status{
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ID: "A",
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Account: otherAccount,
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InReplyToID: &b.ID,
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InReplyToAccountID: &b.Account.ID,
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}
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d := &apimodel.Status{
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ID: "D",
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Account: targetAccount,
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InReplyToID: &b.ID,
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InReplyToAccountID: &b.Account.ID,
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}
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c := &apimodel.Status{
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ID: "C",
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Account: otherAccount,
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InReplyToID: &d.ID,
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InReplyToAccountID: &d.Account.ID,
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}
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e := &apimodel.Status{
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ID: "E",
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Account: targetAccount,
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InReplyToID: &d.ID,
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InReplyToAccountID: &d.Account.ID,
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}
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g := &apimodel.Status{
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ID: "G",
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Account: otherAccount,
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InReplyToID: &f.ID,
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InReplyToAccountID: &f.Account.ID,
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}
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i := &apimodel.Status{
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ID: "I",
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Account: targetAccount,
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InReplyToID: &g.ID,
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InReplyToAccountID: &g.Account.ID,
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}
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h := &apimodel.Status{
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ID: "H",
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Account: otherAccount,
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InReplyToID: &i.ID,
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InReplyToAccountID: &i.Account.ID,
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}
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expected := statusIDs([]*apimodel.Status{f, b, d, e, c, a, g, i, h})
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list := []*apimodel.Status{a, b, c, d, e, f, g, h, i}
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status.TopoSort(list, targetAccount.ID)
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actual := statusIDs(list)
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suite.Equal(expected, actual)
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}
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func (suite *topoSortTestSuite) TestDisconnected() {
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f := &apimodel.Status{ID: "F"}
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b := &apimodel.Status{ID: "B", InReplyToID: &f.ID}
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dID := "D"
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e := &apimodel.Status{ID: "E", InReplyToID: &dID}
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expected := statusIDs([]*apimodel.Status{e, f, b})
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list := []*apimodel.Status{b, e, f}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.Equal(expected, actual)
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}
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func (suite *topoSortTestSuite) TestTrivialCycle() {
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xID := "X"
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x := &apimodel.Status{ID: xID, InReplyToID: &xID}
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expected := statusIDs([]*apimodel.Status{x})
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list := []*apimodel.Status{x}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.ElementsMatch(expected, actual)
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}
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func (suite *topoSortTestSuite) TestCycle() {
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yID := "Y"
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x := &apimodel.Status{ID: "X", InReplyToID: &yID}
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y := &apimodel.Status{ID: yID, InReplyToID: &x.ID}
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expected := statusIDs([]*apimodel.Status{x, y})
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list := []*apimodel.Status{x, y}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.ElementsMatch(expected, actual)
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}
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func (suite *topoSortTestSuite) TestMixedCycle() {
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yID := "Y"
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x := &apimodel.Status{ID: "X", InReplyToID: &yID}
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y := &apimodel.Status{ID: yID, InReplyToID: &x.ID}
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z := &apimodel.Status{ID: "Z"}
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expected := statusIDs([]*apimodel.Status{x, y, z})
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list := []*apimodel.Status{x, y, z}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.ElementsMatch(expected, actual)
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}
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func (suite *topoSortTestSuite) TestEmpty() {
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expected := statusIDs([]*apimodel.Status{})
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list := []*apimodel.Status{}
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.Equal(expected, actual)
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}
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func (suite *topoSortTestSuite) TestNil() {
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expected := statusIDs(nil)
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var list []*apimodel.Status
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status.TopoSort(list, "")
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actual := statusIDs(list)
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suite.Equal(expected, actual)
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}
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func TestTopoSortTestSuite(t *testing.T) {
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suite.Run(t, &topoSortTestSuite{})
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}
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