mirrors/gotosocial
1
0
Fork 0
mirror of https://github.com/superseriousbusiness/gotosocial.git synced 2025-10-30 22:32:25 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

[chore] much improved paging package (#2182)

Browse source
This commit is contained in:
kim 2023-09-07 15:58:37 +01:00 • committed by GitHub
commit b093947d84
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
15 changed files with 1154 additions and 445 deletions
Download patch file Download diff file Expand all files Collapse all files

14
internal/api/client/blocks/blocksget.go
View file

@ -103,8 +103,12 @@ func (m *Module) BlocksGETHandler(c *gin.Context) {
return
}
limit, errWithCode := apiutil.ParseLimit(c.Query(LimitKey), 20, 100, 2)
if err != nil {
page, errWithCode := paging.ParseIDPage(c,
1, // min limit
100, // max limit
20, // default limit
)
if errWithCode != nil {
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
return
}
@ -112,11 +116,7 @@ func (m *Module) BlocksGETHandler(c *gin.Context) {
resp, errWithCode := m.processor.BlocksGet(
c.Request.Context(),
authed.Account,
paging.Pager{
SinceID: c.Query(SinceIDKey),
MaxID: c.Query(MaxIDKey),
Limit: limit,
},
page,
)
if errWithCode != nil {
apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)

25
internal/cache/slice.go vendored
View file

@ -49,28 +49,3 @@ func (c *SliceCache[T]) Load(key string, load func() ([]T, error)) ([]T, error)
// Return data clone for safety.
return slices.Clone(data), nil
}
// LoadRange is functionally the same as .Load(), but will pass the result through provided reslice function before returning a cloned result.
func (c *SliceCache[T]) LoadRange(key string, load func() ([]T, error), reslice func([]T) []T) ([]T, error) {
// Look for follow IDs list in cache under this key.
data, ok := c.Get(key)
if !ok {
var err error
// Not cached, load!
data, err = load()
if err != nil {
return nil, err
}
// Store the data.
c.Set(key, data)
}
// Reslice to range.
slice := reslice(data)
// Return range clone for safety.
return slices.Clone(slice), nil
}

17
internal/db/bundb/relationship.go
View file

@ -150,9 +150,9 @@ func (r *relationshipDB) GetAccountFollowRequesting(ctx context.Context, account
return r.GetFollowRequestsByIDs(ctx, followReqIDs)
}
func (r *relationshipDB) GetAccountBlocks(ctx context.Context, accountID string, page *paging.Pager) ([]*gtsmodel.Block, error) {
func (r *relationshipDB) GetAccountBlocks(ctx context.Context, accountID string, page *paging.Page) ([]*gtsmodel.Block, error) {
// Load block IDs from cache with database loader callback.
blockIDs, err := r.state.Caches.GTS.BlockIDs().LoadRange(accountID, func() ([]string, error) {
blockIDs, err := r.state.Caches.GTS.BlockIDs().Load(accountID, func() ([]string, error) {
var blockIDs []string
// Block IDs not in cache, perform DB query!
@ -162,11 +162,22 @@ func (r *relationshipDB) GetAccountBlocks(ctx context.Context, accountID string,
}
return blockIDs, nil
}, page.PageDesc)
})
if err != nil {
return nil, err
}
// Our cached / selected block IDs are
// ALWAYS stored in descending order.
// Depending on the paging requested
// this may be an unexpected order.
if !page.GetOrder().Ascending() {
blockIDs = paging.Reverse(blockIDs)
}
// Page the resulting block IDs.
blockIDs = page.Page(blockIDs)
// Convert these IDs to full block objects.
return r.GetBlocksByIDs(ctx, blockIDs)
}

2
internal/db/relationship.go
View file

@ -174,7 +174,7 @@ type Relationship interface {
CountAccountFollowRequesting(ctx context.Context, accountID string) (int, error)
// GetAccountBlocks returns all blocks originating from the given account, with given optional paging parameters.
GetAccountBlocks(ctx context.Context, accountID string, paging *paging.Pager) ([]*gtsmodel.Block, error)
GetAccountBlocks(ctx context.Context, accountID string, paging *paging.Page) ([]*gtsmodel.Block, error)
// GetNote gets a private note from a source account on a target account, if it exists.
GetNote(ctx context.Context, sourceAccountID string, targetAccountID string) (*gtsmodel.AccountNote, error)

135
internal/paging/boundary.go Normal file
View file

@ -0,0 +1,135 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
// MinID returns an ID boundary with given min ID value,
// using either the `since_id`,"DESC" name,ordering or
// `min_id`,"ASC" name,ordering depending on which is set.
func MinID(minID, sinceID string) Boundary {
/*
Paging with `since_id` vs `min_id`:
limit = 4 limit = 4
+----------+ +----------+
max_id--> |xxxxxxxxxx| | | <-- max_id
+----------+ +----------+
|xxxxxxxxxx| | |
+----------+ +----------+
|xxxxxxxxxx| | |
+----------+ +----------+
|xxxxxxxxxx| |xxxxxxxxxx|
+----------+ +----------+
| | |xxxxxxxxxx|
+----------+ +----------+
| | |xxxxxxxxxx|
+----------+ +----------+
since_id--> | | |xxxxxxxxxx| <-- min_id
+----------+ +----------+
| | | |
+----------+ +----------+
*/
switch {
case minID != "":
return Boundary{
Name: "min_id",
Value: minID,
Order: OrderAscending,
}
default:
// default min is `since_id`
return Boundary{
Name: "since_id",
Value: sinceID,
Order: OrderDescending,
}
}
}
// MaxID returns an ID boundary with given max
// ID value, and the "max_id" query key set.
func MaxID(maxID string) Boundary {
return Boundary{
Name: "max_id",
Value: maxID,
Order: OrderDescending,
}
}
// MinShortcodeDomain returns a boundary with the given minimum emoji
// shortcode@domain, and the "min_shortcode_domain" query key set.
func MinShortcodeDomain(min string) Boundary {
return Boundary{
Name: "min_shortcode_domain",
Value: min,
Order: OrderAscending,
}
}
// MaxShortcodeDomain returns a boundary with the given maximum emoji
// shortcode@domain, and the "max_shortcode_domain" query key set.
func MaxShortcodeDomain(max string) Boundary {
return Boundary{
Name: "max_shortcode_domain",
Value: max,
Order: OrderDescending,
}
}
// Boundary represents the upper or lower limit in a page slice.
type Boundary struct {
Name string // i.e. query key
Value string
Order Order // NOTE: see Order type for explanation
}
// new creates a new Boundary with the same ordering and name
// as the original (receiving), but with the new provided value.
func (b Boundary) new(value string) Boundary {
return Boundary{
Name: b.Name,
Value: value,
Order: b.Order,
}
}
// Find finds the boundary's set value in input slice, or returns -1.
func (b Boundary) Find(in []string) int {
if zero(b.Value) {
return -1
}
for i := range in {
if in[i] == b.Value {
return i
}
}
return -1
}
// Query returns this boundary as assembled query key=value pair.
func (b Boundary) Query() string {
switch {
case zero(b.Value):
return ""
case b.Name == "":
panic("value without boundary name")
default:
return b.Name + "=" + b.Value
}
}

55
internal/paging/order.go Normal file
View file

@ -0,0 +1,55 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
// Order represents the order an input
// page should be sorted and paged in.
//
// NOTE: this does not effect the order of returned
// API results, which must always be in descending
// order. This behaviour is confusing, but we adopt
// it to stay inline with Mastodon API expectations.
type Order int
const (
_default Order = iota
OrderDescending
OrderAscending
)
// Ascending returns whether this Order is ascending.
func (i Order) Ascending() bool {
return i == OrderAscending
}
// Descending returns whether this Order is descending.
func (i Order) Descending() bool {
return i == OrderDescending
}
// String returns a string representation of Order.
func (i Order) String() string {
switch i {
case OrderDescending:
return "Descending"
case OrderAscending:
return "Ascending"
default:
return "not-specified"
}
}

251
internal/paging/page.go Normal file
View file

@ -0,0 +1,251 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
import (
"net/url"
"strconv"
"strings"
"golang.org/x/exp/slices"
)
type Page struct {
// Min is the Page's lower limit value.
Min Boundary
// Max is this Page's upper limit value.
Max Boundary
// Limit will limit the returned
// page of items to at most 'limit'.
Limit int
}
// GetMin is a small helper function to return minimum boundary value (checking for nil page).
func (p *Page) GetMin() string {
if p == nil {
return ""
}
return p.Min.Value
}
// GetMax is a small helper function to return maximum boundary value (checking for nil page).
func (p *Page) GetMax() string {
if p == nil {
return ""
}
return p.Max.Value
}
// GetLimit is a small helper function to return limit (checking for nil page and unusable limit).
func (p *Page) GetLimit() int {
if p == nil || p.Limit < 0 {
return 0
}
return p.Limit
}
// GetOrder is a small helper function to return page sort ordering (checking for nil page).
func (p *Page) GetOrder() Order {
if p == nil {
return 0
}
return p.order()
}
func (p *Page) order() Order {
var (
// Check if min/max values set.
minValue = zero(p.Min.Value)
maxValue = zero(p.Max.Value)
// Check if min/max orders set.
minOrder = (p.Min.Order != 0)
maxOrder = (p.Max.Order != 0)
)
switch {
// Boundaries with a value AND order set
// take priority. Min always comes first.
case minValue && minOrder:
return p.Min.Order
case maxValue && maxOrder:
return p.Max.Order
case minOrder:
return p.Min.Order
case maxOrder:
return p.Max.Order
default:
return 0
}
}
// Page will page the given slice of input according
// to the receiving Page's minimum, maximum and limit.
// NOTE: input slice MUST be sorted according to the order is
// expected to be paged in, i.e. it is currently sorted
// according to Page.Order(). Sorted data isn't always according
// to string inequalities so this CANNOT be checked here.
func (p *Page) Page(in []string) []string {
if p == nil {
// no paging.
return in
}
if o := p.order(); !o.Ascending() {
// Default sort is descending,
// catching all cases when NOT
// ascending (even zero value).
//
// NOTE: sorted data does not always
// occur according to string ineqs
// so we unfortunately cannot check.
if maxIdx := p.Max.Find(in); maxIdx != -1 {
// Reslice skipping up to max.
in = in[maxIdx+1:]
}
if minIdx := p.Min.Find(in); minIdx != -1 {
// Reslice stripping past min.
in = in[:minIdx]
}
} else {
// Sort type is ascending, input
// data is assumed to be ascending.
//
// NOTE: sorted data does not always
// occur according to string ineqs
// so we unfortunately cannot check.
if minIdx := p.Min.Find(in); minIdx != -1 {
// Reslice skipping up to min.
in = in[minIdx+1:]
}
if maxIdx := p.Max.Find(in); maxIdx != -1 {
// Reslice stripping past max.
in = in[:maxIdx]
}
if len(in) > 1 {
// Clone input before
// any modifications.
in = slices.Clone(in)
// Output slice must
// ALWAYS be descending.
in = Reverse(in)
}
}
if p.Limit > 0 && p.Limit < len(in) {
// Reslice input to limit.
in = in[:p.Limit]
}
return in
}
// Next creates a new instance for the next returnable page, using
// given max value. This preserves original limit and max key name.
func (p *Page) Next(max string) *Page {
if p == nil || max == "" {
// no paging.
return nil
}
// Create new page.
p2 := new(Page)
// Set original limit.
p2.Limit = p.Limit
// Create new from old.
p2.Max = p.Max.new(max)
return p2
}
// Prev creates a new instance for the prev returnable page, using
// given min value. This preserves original limit and min key name.
func (p *Page) Prev(min string) *Page {
if p == nil || min == "" {
// no paging.
return nil
}
// Create new page.
p2 := new(Page)
// Set original limit.
p2.Limit = p.Limit
// Create new from old.
p2.Min = p.Min.new(min)
return p2
}
// ToLink builds a URL link for given endpoint information and extra query parameters,
// appending this Page's minimum / maximum boundaries and available limit (if any).
func (p *Page) ToLink(proto, host, path string, queryParams []string) string {
if p == nil {
// no paging.
return ""
}
// Check length before
// adding boundary params.
old := len(queryParams)
if minParam := p.Min.Query(); minParam != "" {
// A page-minimum query parameter is available.
queryParams = append(queryParams, minParam)
}
if maxParam := p.Max.Query(); maxParam != "" {
// A page-maximum query parameter is available.
queryParams = append(queryParams, maxParam)
}
if len(queryParams) == old {
// No page boundaries.
return ""
}
if p.Limit > 0 {
// Build limit key-value query parameter.
param := "limit=" + strconv.Itoa(p.Limit)
// Append `limit=$value` query parameter.
queryParams = append(queryParams, param)
}
// Join collected params into query str.
query := strings.Join(queryParams, "&")
// Build URL string.
return (&url.URL{
Scheme: proto,
Host: host,
Path: path,
RawQuery: query,
}).String()
}

298
internal/paging/page_test.go Normal file
View file

@ -0,0 +1,298 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging_test
import (
"math/rand"
"testing"
"time"
"github.com/oklog/ulid"
"github.com/superseriousbusiness/gotosocial/internal/paging"
"golang.org/x/exp/slices"
)
// random reader according to current-time source seed.
var randRd = rand.New(rand.NewSource(time.Now().Unix()))
type Case struct {
// Name is the test case name.
Name string
// Page to use for test.
Page *paging.Page
// Input contains test case input ID slice.
Input []string
// Expect contains expected test case output.
Expect []string
}
// CreateCase creates a new test case with random input for function defining test page parameters and expected output.
func CreateCase(name string, getParams func([]string) (input []string, page *paging.Page, expect []string)) Case {
i := randRd.Intn(100)
in := generateSlice(i)
input, page, expect := getParams(in)
return Case{
Name: name,
Page: page,
Input: input,
Expect: expect,
}
}
func TestPage(t *testing.T) {
for _, c := range cases {
t.Run(c.Name, func(t *testing.T) {
// Page the input slice.
out := c.Page.Page(c.Input)
// Log the results for case of error returns.
t.Logf("\ninput=%v\noutput=%v\nexpected=%v", c.Input, out, c.Expect)
// Check paged output is as expected.
if !slices.Equal(out, c.Expect) {
t.Error("unexpected paged output")
}
})
}
}
var cases = []Case{
CreateCase("minID and maxID set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted ascending for min_id
slices.SortFunc(ids, func(a, b string) bool {
return a > b // i.e. largest at lowest idx
})
// Select random indices in slice.
minIdx := randRd.Intn(len(ids))
maxIdx := randRd.Intn(len(ids))
// Select the boundaries.
minID := ids[minIdx]
maxID := ids[maxIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, minID)
expect = cutUpper(expect, maxID)
expect = paging.Reverse(expect)
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID(minID, ""),
Max: paging.MaxID(maxID),
}, expect
}),
CreateCase("minID, maxID and limit set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted ascending for min_id
slices.SortFunc(ids, func(a, b string) bool {
return a > b // i.e. largest at lowest idx
})
// Select random parameters in slice.
minIdx := randRd.Intn(len(ids))
maxIdx := randRd.Intn(len(ids))
limit := randRd.Intn(len(ids))
// Select the boundaries.
minID := ids[minIdx]
maxID := ids[maxIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, minID)
expect = cutUpper(expect, maxID)
expect = paging.Reverse(expect)
// Now limit the slice.
if limit < len(expect) {
expect = expect[:limit]
}
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID(minID, ""),
Max: paging.MaxID(maxID),
Limit: limit,
}, expect
}),
CreateCase("minID, maxID and too-large limit set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted ascending for min_id
slices.SortFunc(ids, func(a, b string) bool {
return a > b // i.e. largest at lowest idx
})
// Select random parameters in slice.
minIdx := randRd.Intn(len(ids))
maxIdx := randRd.Intn(len(ids))
// Select the boundaries.
minID := ids[minIdx]
maxID := ids[maxIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, minID)
expect = cutUpper(expect, maxID)
expect = paging.Reverse(expect)
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID(minID, ""),
Max: paging.MaxID(maxID),
Limit: len(ids) * 2,
}, expect
}),
CreateCase("sinceID and maxID set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted descending for since_id
slices.SortFunc(ids, func(a, b string) bool {
return a < b // i.e. smallest at lowest idx
})
// Select random indices in slice.
sinceIdx := randRd.Intn(len(ids))
maxIdx := randRd.Intn(len(ids))
// Select the boundaries.
sinceID := ids[sinceIdx]
maxID := ids[maxIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, maxID)
expect = cutUpper(expect, sinceID)
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID("", sinceID),
Max: paging.MaxID(maxID),
}, expect
}),
CreateCase("maxID set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted descending for max_id
slices.SortFunc(ids, func(a, b string) bool {
return a < b // i.e. smallest at lowest idx
})
// Select random indices in slice.
maxIdx := randRd.Intn(len(ids))
// Select the boundaries.
maxID := ids[maxIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, maxID)
// Return page and expected IDs.
return ids, &paging.Page{
Max: paging.MaxID(maxID),
}, expect
}),
CreateCase("sinceID set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted descending for since_id
slices.SortFunc(ids, func(a, b string) bool {
return a < b
})
// Select random indices in slice.
sinceIdx := randRd.Intn(len(ids))
// Select the boundaries.
sinceID := ids[sinceIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutUpper(expect, sinceID)
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID("", sinceID),
}, expect
}),
CreateCase("minID set", func(ids []string) ([]string, *paging.Page, []string) {
// Ensure input slice sorted ascending for min_id
slices.SortFunc(ids, func(a, b string) bool {
return a > b // i.e. largest at lowest idx
})
// Select random indices in slice.
minIdx := randRd.Intn(len(ids))
// Select the boundaries.
minID := ids[minIdx]
// Create expected output.
expect := slices.Clone(ids)
expect = cutLower(expect, minID)
expect = paging.Reverse(expect)
// Return page and expected IDs.
return ids, &paging.Page{
Min: paging.MinID(minID, ""),
}, expect
}),
}
// cutLower cuts off the lower part of the slice from `bound` downwards.
func cutLower(in []string, bound string) []string {
for i := 0; i < len(in); i++ {
if in[i] == bound {
return in[i+1:]
}
}
return in
}
// cutUpper cuts off the upper part of the slice from `bound` onwards.
func cutUpper(in []string, bound string) []string {
for i := 0; i < len(in); i++ {
if in[i] == bound {
return in[:i]
}
}
return in
}
// generateSlice generates a new slice of len containing ascending sorted slice.
func generateSlice(len int) []string {
if len <= 0 {
// minimum testable
// pageable amount
len = 2
}
now := time.Now()
in := make([]string, len)
for i := 0; i < len; i++ {
// Convert now to timestamp.
t := ulid.Timestamp(now)
// Create anew ulid for now.
u := ulid.MustNew(t, randRd)
// Add to slice.
in[i] = u.String()
// Bump now by 1 second.
now = now.Add(time.Second)
}
return in
}

227
internal/paging/paging.go
View file

@ -1,227 +0,0 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
import "golang.org/x/exp/slices"
// Pager provides a means of paging serialized IDs,
// using the terminology of our API endpoint queries.
type Pager struct {
// SinceID will limit the returned
// page of IDs to contain newer than
// since ID (excluding it). Result
// will be returned DESCENDING.
SinceID string
// MinID will limit the returned
// page of IDs to contain newer than
// min ID (excluding it). Result
// will be returned ASCENDING.
MinID string
// MaxID will limit the returned
// page of IDs to contain older
// than (excluding) this max ID.
MaxID string
// Limit will limit the returned
// page of IDs to at most 'limit'.
Limit int
}
// Page will page the given slice of GoToSocial IDs according
// to the receiving Pager's SinceID, MinID, MaxID and Limits.
// NOTE THE INPUT SLICE MUST BE SORTED IN ASCENDING ORDER
// (I.E. OLDEST ITEMS AT LOWEST INDICES, NEWER AT HIGHER).
func (p *Pager) PageAsc(ids []string) []string {
if p == nil {
// no paging.
return ids
}
var asc bool
if p.SinceID != "" {
// If a sinceID is given, we
// page down i.e. descending.
asc = false
for i := 0; i < len(ids); i++ {
if ids[i] == p.SinceID {
// Hit the boundary.
// Reslice to be:
// "from here"
ids = ids[i+1:]
break
}
}
} else if p.MinID != "" {
// We only support minID if
// no sinceID is provided.
//
// If a minID is given, we
// page up, i.e. ascending.
asc = true
for i := 0; i < len(ids); i++ {
if ids[i] == p.MinID {
// Hit the boundary.
// Reslice to be:
// "from here"
ids = ids[i+1:]
break
}
}
}
if p.MaxID != "" {
for i := 0; i < len(ids); i++ {
if ids[i] == p.MaxID {
// Hit the boundary.
// Reslice to be:
// "up to here"
ids = ids[:i]
break
}
}
}
if !asc && len(ids) > 1 {
var (
// Start at front.
i = 0
// Start at back.
j = len(ids) - 1
)
// Clone input IDs before
// we perform modifications.
ids = slices.Clone(ids)
for i < j {
// Swap i,j index values in slice.
ids[i], ids[j] = ids[j], ids[i]
// incr + decr,
// looping until
// they meet in
// the middle.
i++
j--
}
}
if p.Limit > 0 && p.Limit < len(ids) {
// Reslice IDs to given limit.
ids = ids[:p.Limit]
}
return ids
}
// Page will page the given slice of GoToSocial IDs according
// to the receiving Pager's SinceID, MinID, MaxID and Limits.
// NOTE THE INPUT SLICE MUST BE SORTED IN ASCENDING ORDER.
// (I.E. NEWEST ITEMS AT LOWEST INDICES, OLDER AT HIGHER).
func (p *Pager) PageDesc(ids []string) []string {
if p == nil {
// no paging.
return ids
}
var asc bool
if p.MaxID != "" {
for i := 0; i < len(ids); i++ {
if ids[i] == p.MaxID {
// Hit the boundary.
// Reslice to be:
// "from here"
ids = ids[i+1:]
break
}
}
}
if p.SinceID != "" {
// If a sinceID is given, we
// page down i.e. descending.
asc = false
for i := 0; i < len(ids); i++ {
if ids[i] == p.SinceID {
// Hit the boundary.
// Reslice to be:
// "up to here"
ids = ids[:i]
break
}
}
} else if p.MinID != "" {
// We only support minID if
// no sinceID is provided.
//
// If a minID is given, we
// page up, i.e. ascending.
asc = true
for i := 0; i < len(ids); i++ {
if ids[i] == p.MinID {
// Hit the boundary.
// Reslice to be:
// "up to here"
ids = ids[:i]
break
}
}
}
if asc && len(ids) > 1 {
var (
// Start at front.
i = 0
// Start at back.
j = len(ids) - 1
)
// Clone input IDs before
// we perform modifications.
ids = slices.Clone(ids)
for i < j {
// Swap i,j index values in slice.
ids[i], ids[j] = ids[j], ids[i]
// incr + decr,
// looping until
// they meet in
// the middle.
i++
j--
}
}
if p.Limit > 0 && p.Limit < len(ids) {
// Reslice IDs to given limit.
ids = ids[:p.Limit]
}
return ids
}

171
internal/paging/paging_test.go
View file

@ -1,171 +0,0 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging_test
import (
"testing"
"github.com/superseriousbusiness/gotosocial/internal/paging"
"golang.org/x/exp/slices"
)
type Case struct {
// Name is the test case name.
Name string
// Input contains test case input ID slice.
Input []string
// Expect contains expected test case output.
Expect []string
// Page contains the paging function to use.
Page func([]string) []string
}
var cases = []Case{
{
Name: "min_id and max_id set",
Input: []string{
"064Q5D7VG6TPPQ46T09MHJ96FW",
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
"064Q5D7VKG5EQ43TYP71B4K6K0",
},
Expect: []string{
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
},
Page: (&paging.Pager{
MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
}).PageAsc,
},
{
Name: "min_id, max_id and limit set",
Input: []string{
"064Q5D7VG6TPPQ46T09MHJ96FW",
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
"064Q5D7VKG5EQ43TYP71B4K6K0",
},
Expect: []string{
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
},
Page: (&paging.Pager{
MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
Limit: 5,
}).PageAsc,
},
{
Name: "min_id, max_id and too-large limit set",
Input: []string{
"064Q5D7VG6TPPQ46T09MHJ96FW",
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
"064Q5D7VKG5EQ43TYP71B4K6K0",
},
Expect: []string{
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
},
Page: (&paging.Pager{
MinID: "064Q5D7VG6TPPQ46T09MHJ96FW",
MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
Limit: 100,
}).PageAsc,
},
{
Name: "since_id and max_id set",
Input: []string{
"064Q5D7VG6TPPQ46T09MHJ96FW",
"064Q5D7VGPTC4NK5T070VYSSF8",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VK8H7WMJS399SHEPCB0",
"064Q5D7VKG5EQ43TYP71B4K6K0",
},
Expect: []string{
"064Q5D7VK8H7WMJS399SHEPCB0",
"064Q5D7VJYFBYSAH86KDBKZ6AC",
"064Q5D7VJMWXZD3S1KT7RD51N8",
"064Q5D7VJADJTPA3GW8WAX10TW",
"064Q5D7VJ073XG9ZTWHA2KHN10",
"064Q5D7VHMSW9DF3GCS088VAZC",
"064Q5D7VH5F0JXG6W5NCQ3JCWW",
"064Q5D7VGPTC4NK5T070VYSSF8",
},
Page: (&paging.Pager{
SinceID: "064Q5D7VG6TPPQ46T09MHJ96FW",
MaxID: "064Q5D7VKG5EQ43TYP71B4K6K0",
}).PageAsc,
},
}
func TestPage(t *testing.T) {
for _, c := range cases {
t.Run(c.Name, func(t *testing.T) {
// Page the input slice.
out := c.Page(c.Input)
// Check paged output is as expected.
if !slices.Equal(out, c.Expect) {
t.Errorf("\nreceived=%v\nexpect%v\n", out, c.Expect)
}
})
}
}

111
internal/paging/parse.go Normal file
View file

@ -0,0 +1,111 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
import (
"strconv"
"github.com/gin-gonic/gin"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
)
// ParseIDPage parses an ID Page from a request context, returning BadRequest on error parsing.
// The min, max and default parameters define the page size limit minimum, maximum and default
// value, where a non-zero default will enforce paging for the endpoint on which this is called.
// While conversely, a zero default limit will not enforce paging, returning a nil page value.
func ParseIDPage(c *gin.Context, min, max, _default int) (*Page, gtserror.WithCode) {
// Extract request query params.
sinceID := c.Query("since_id")
minID := c.Query("min_id")
maxID := c.Query("max_id")
// Extract request limit parameter.
limit, errWithCode := ParseLimit(c, min, max, _default)
if errWithCode != nil {
return nil, errWithCode
}
if sinceID == "" &&
minID == "" &&
maxID == "" &&
limit == 0 {
// No ID paging params provided, and no default
// limit value which indicates paging not enforced.
return nil, nil
}
return &Page{
Min: MinID(minID, sinceID),
Max: MaxID(maxID),
Limit: limit,
}, nil
}
// ParseShortcodeDomainPage parses an emoji shortcode domain Page from a request context, returning BadRequest
// on error parsing. The min, max and default parameters define the page size limit minimum, maximum and default
// value where a non-zero default will enforce paging for the endpoint on which this is called. While conversely,
// a zero default limit will not enforce paging, returning a nil page value.
func ParseShortcodeDomainPage(c *gin.Context, min, max, _default int) (*Page, gtserror.WithCode) {
// Extract request query parameters.
minShortcode := c.Query("min_shortcode_domain")
maxShortcode := c.Query("max_shortcode_domain")
// Extract request limit parameter.
limit, errWithCode := ParseLimit(c, min, max, _default)
if errWithCode != nil {
return nil, errWithCode
}
if minShortcode == "" &&
maxShortcode == "" &&
limit == 0 {
// No ID paging params provided, and no default
// limit value which indicates paging not enforced.
return nil, nil
}
return &Page{
Min: MinShortcodeDomain(minShortcode),
Max: MaxShortcodeDomain(maxShortcode),
Limit: limit,
}, nil
}
// ParseLimit parses the limit query parameter from a request context, returning BadRequest on error parsing and _default if zero limit given.
func ParseLimit(c *gin.Context, min, max, _default int) (int, gtserror.WithCode) {
// Get limit query param.
str := c.Query("limit")
// Attempt to parse limit int.
i, err := strconv.Atoi(str)
if err != nil {
const help = "bad integer limit value"
return 0, gtserror.NewErrorBadRequest(err, help)
}
switch {
case i == 0:
return _default, nil
case i < min:
return min, nil
case i > max:
return max, nil
default:
return i, nil
}
}

91
internal/paging/response.go Normal file
View file

@ -0,0 +1,91 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
import (
"strings"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/config"
)
// ResponseParams models the parameters to pass to PageableResponse.
//
// The given items will be provided in the paged response.
//
// The other values are all used to create the Link header so that callers know
// which endpoint to query next and previously in order to do paging.
type ResponseParams struct {
Items []interface{} // Sorted slice of items (statuses, notifications, etc)
Path string // path to use for next/prev queries in the link header
Next *Page // page details for the next page
Prev *Page // page details for the previous page
Query []string // any extra query parameters to provide in the link header, should be in the format 'example=value'
}
// PackageResponse is a convenience function for returning
// a bunch of pageable items (notifications, statuses, etc), as well
// as a Link header to inform callers of where to find next/prev items.
func PackageResponse(params ResponseParams) *apimodel.PageableResponse {
if len(params.Items) == 0 {
// No items to page through.
return EmptyResponse()
}
var (
// Extract paging params.
nextPg = params.Next
prevPg = params.Prev
// Host app configuration.
proto = config.GetProtocol()
host = config.GetHost()
// Combined next/prev page link header parts.
linkHeaderParts = make([]string, 0, 2)
)
// Build the next / previous page links from page and host config.
nextLink := nextPg.ToLink(proto, host, params.Path, params.Query)
prevLink := prevPg.ToLink(proto, host, params.Path, params.Query)
if nextLink != "" {
// Append page "next" link to header parts.
linkHeaderParts = append(linkHeaderParts, `<`+nextLink+`>; rel="next"`)
}
if prevLink != "" {
// Append page "prev" link to header parts.
linkHeaderParts = append(linkHeaderParts, `<`+prevLink+`>; rel="prev"`)
}
return &apimodel.PageableResponse{
Items: params.Items,
NextLink: nextLink,
PrevLink: prevLink,
LinkHeader: strings.Join(linkHeaderParts, ", "),
}
}
// EmptyResponse just returns an empty
// PageableResponse with no link header or items.
func EmptyResponse() *apimodel.PageableResponse {
return &apimodel.PageableResponse{
Items: []interface{}{},
}
}

134
internal/paging/response_test.go Normal file
View file

@ -0,0 +1,134 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging_test
import (
"testing"
"github.com/stretchr/testify/suite"
"github.com/superseriousbusiness/gotosocial/internal/config"
"github.com/superseriousbusiness/gotosocial/internal/paging"
)
type PagingSuite struct {
suite.Suite
}
func (suite *PagingSuite) TestPagingStandard() {
config.SetHost("example.org")
params := paging.ResponseParams{
Items: make([]interface{}, 10, 10),
Path: "/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses",
Next: nextPage("01H11KA1DM2VH3747YDE7FV5HN", 10),
Prev: prevPage("01H11KBBVRRDYYC5KEPME1NP5R", 10),
}
resp := paging.PackageResponse(params)
suite.Equal(make([]interface{}, 10, 10), resp.Items)
suite.Equal(`<https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN&limit=10>; rel="next", <https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R&limit=10>; rel="prev"`, resp.LinkHeader)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN&limit=10`, resp.NextLink)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R&limit=10`, resp.PrevLink)
}
func (suite *PagingSuite) TestPagingNoLimit() {
config.SetHost("example.org")
params := paging.ResponseParams{
Items: make([]interface{}, 10, 10),
Path: "/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses",
Next: nextPage("01H11KA1DM2VH3747YDE7FV5HN", 0),
Prev: prevPage("01H11KBBVRRDYYC5KEPME1NP5R", 0),
}
resp := paging.PackageResponse(params)
suite.Equal(make([]interface{}, 10, 10), resp.Items)
suite.Equal(`<https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN>; rel="next", <https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R>; rel="prev"`, resp.LinkHeader)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN`, resp.NextLink)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R`, resp.PrevLink)
}
func (suite *PagingSuite) TestPagingNoNextID() {
config.SetHost("example.org")
params := paging.ResponseParams{
Items: make([]interface{}, 10, 10),
Path: "/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses",
Prev: prevPage("01H11KBBVRRDYYC5KEPME1NP5R", 10),
}
resp := paging.PackageResponse(params)
suite.Equal(make([]interface{}, 10, 10), resp.Items)
suite.Equal(`<https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R&limit=10>; rel="prev"`, resp.LinkHeader)
suite.Equal(``, resp.NextLink)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?min_id=01H11KBBVRRDYYC5KEPME1NP5R&limit=10`, resp.PrevLink)
}
func (suite *PagingSuite) TestPagingNoPrevID() {
config.SetHost("example.org")
params := paging.ResponseParams{
Items: make([]interface{}, 10, 10),
Path: "/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses",
Next: nextPage("01H11KA1DM2VH3747YDE7FV5HN", 10),
}
resp := paging.PackageResponse(params)
suite.Equal(make([]interface{}, 10, 10), resp.Items)
suite.Equal(`<https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN&limit=10>; rel="next"`, resp.LinkHeader)
suite.Equal(`https://example.org/api/v1/accounts/01H11KA68PM4NNYJEG0FJQ90R3/statuses?max_id=01H11KA1DM2VH3747YDE7FV5HN&limit=10`, resp.NextLink)
suite.Equal(``, resp.PrevLink)
}
func (suite *PagingSuite) TestPagingNoItems() {
config.SetHost("example.org")
params := paging.ResponseParams{
Next: nextPage("01H11KA1DM2VH3747YDE7FV5HN", 10),
Prev: prevPage("01H11KBBVRRDYYC5KEPME1NP5R", 10),
}
resp := paging.PackageResponse(params)
suite.Empty(resp.Items)
suite.Empty(resp.LinkHeader)
suite.Empty(resp.NextLink)
suite.Empty(resp.PrevLink)
}
func TestPagingSuite(t *testing.T) {
suite.Run(t, &PagingSuite{})
}
func nextPage(id string, limit int) *paging.Page {
return &paging.Page{
Max: paging.MaxID(id),
Limit: limit,
}
}
func prevPage(id string, limit int) *paging.Page {
return &paging.Page{
Min: paging.MinID(id, ""),
Limit: limit,
}
}

49
internal/paging/util.go Normal file
View file

@ -0,0 +1,49 @@
// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package paging
// Reverse will reverse the given input slice.
func Reverse(in []string) []string {
var (
// Start at front.
i = 0
// Start at back.
j = len(in) - 1
)
for i < j {
// Swap i,j index values in slice.
in[i], in[j] = in[j], in[i]
// incr + decr,
// looping until
// they meet in
// the middle.
i++
j--
}
return in
}
// zero is a shorthand to check a generic value is its zero value.
func zero[T comparable](t T) bool {
var z T
return t == z
}

15
internal/processing/blocks.go
View file

@ -34,11 +34,11 @@ import (
func (p *Processor) BlocksGet(
ctx context.Context,
requestingAccount *gtsmodel.Account,
page paging.Pager,
page *paging.Page,
) (*apimodel.PageableResponse, gtserror.WithCode) {
blocks, err := p.state.DB.GetAccountBlocks(ctx,
requestingAccount.ID,
&page,
page,
)
if err != nil && !errors.Is(err, db.ErrNoEntries) {
return nil, gtserror.NewErrorInternalError(err)
@ -77,13 +77,10 @@ func (p *Processor) BlocksGet(
items = append(items, account)
}
return util.PackagePageableResponse(util.PageableResponseParams{
return paging.PackageResponse(paging.ResponseParams{
Items: items,
Path: "/api/v1/blocks",
NextMaxIDKey: "max_id",
PrevMinIDKey: "since_id",
NextMaxIDValue: nextMaxIDValue,
PrevMinIDValue: prevMinIDValue,
Limit: page.Limit,
})
Next: page.Next(nextMaxIDValue),
Prev: page.Prev(prevMinIDValue),
}), nil
}