gotosocial/internal/timeline/timeline.go

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/*
GoToSocial
Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org
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 timeline
import (
"sync"
"time"
"github.com/sirupsen/logrus"
apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/typeutils"
"github.com/superseriousbusiness/gotosocial/internal/visibility"
)
const boostReinsertionDepth = 50
// Timeline represents a timeline for one account, and contains indexed and prepared posts.
type Timeline interface {
/*
RETRIEVAL FUNCTIONS
*/
Get(amount int, maxID string, sinceID string, minID string) ([]*apimodel.Status, error)
// GetXFromTop returns x amount of posts from the top of the timeline, from newest to oldest.
GetXFromTop(amount int) ([]*apimodel.Status, error)
// GetXBehindID returns x amount of posts from the given id onwards, from newest to oldest.
// This will NOT include the status with the given ID.
//
// This corresponds to an api call to /timelines/home?max_id=WHATEVER
GetXBehindID(amount int, fromID string, attempts *int) ([]*apimodel.Status, error)
// GetXBeforeID returns x amount of posts up to the given id, from newest to oldest.
// This will NOT include the status with the given ID.
//
// This corresponds to an api call to /timelines/home?since_id=WHATEVER
GetXBeforeID(amount int, sinceID string, startFromTop bool, attempts *int) ([]*apimodel.Status, error)
// GetXBetweenID returns x amount of posts from the given maxID, up to the given id, from newest to oldest.
// This will NOT include the status with the given IDs.
//
// This corresponds to an api call to /timelines/home?since_id=WHATEVER&max_id=WHATEVER_ELSE
GetXBetweenID(amount int, maxID string, sinceID string) ([]*apimodel.Status, error)
/*
INDEXING FUNCTIONS
*/
// IndexOne puts a status into the timeline at the appropriate place according to its 'createdAt' property.
//
// The returned bool indicates whether or not the status was actually inserted into the timeline. This will be false
// if the status is a boost and the original post or another boost of it already exists < boostReinsertionDepth back in the timeline.
IndexOne(statusCreatedAt time.Time, statusID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error)
// OldestIndexedPostID returns the id of the rearmost (ie., the oldest) indexed post, or an error if something goes wrong.
// If nothing goes wrong but there's no oldest post, an empty string will be returned so make sure to check for this.
OldestIndexedPostID() (string, error)
/*
PREPARATION FUNCTIONS
*/
// PrepareXFromTop instructs the timeline to prepare x amount of posts from the top of the timeline.
PrepareFromTop(amount int) error
// PrepareBehind instructs the timeline to prepare the next amount of entries for serialization, from position onwards.
// If include is true, then the given status ID will also be prepared, otherwise only entries behind it will be prepared.
PrepareBehind(statusID string, amount int) error
// IndexOne puts a status into the timeline at the appropriate place according to its 'createdAt' property,
// and then immediately prepares it.
//
// The returned bool indicates whether or not the status was actually inserted into the timeline. This will be false
// if the status is a boost and the original post or another boost of it already exists < boostReinsertionDepth back in the timeline.
IndexAndPrepareOne(statusCreatedAt time.Time, statusID string, boostOfID string, accountID string, boostOfAccountID string) (bool, error)
// OldestPreparedPostID returns the id of the rearmost (ie., the oldest) prepared post, or an error if something goes wrong.
// If nothing goes wrong but there's no oldest post, an empty string will be returned so make sure to check for this.
OldestPreparedPostID() (string, error)
/*
INFO FUNCTIONS
*/
// ActualPostIndexLength returns the actual length of the post index at this point in time.
PostIndexLength() int
/*
UTILITY FUNCTIONS
*/
// Reset instructs the timeline to reset to its base state -- cache only the minimum amount of posts.
Reset() error
// Remove removes a status from both the index and prepared posts.
//
// If a status has multiple entries in a timeline, they will all be removed.
//
// The returned int indicates the amount of entries that were removed.
Remove(statusID string) (int, error)
// RemoveAllBy removes all statuses by the given accountID, from both the index and prepared posts.
//
// The returned int indicates the amount of entries that were removed.
RemoveAllBy(accountID string) (int, error)
}
// timeline fulfils the Timeline interface
type timeline struct {
postIndex *postIndex
preparedPosts *preparedPosts
accountID string
account *gtsmodel.Account
db db.DB
filter visibility.Filter
tc typeutils.TypeConverter
log *logrus.Logger
sync.Mutex
}
// NewTimeline returns a new Timeline for the given account ID
func NewTimeline(accountID string, db db.DB, typeConverter typeutils.TypeConverter, log *logrus.Logger) (Timeline, error) {
timelineOwnerAccount := &gtsmodel.Account{}
if err := db.GetByID(accountID, timelineOwnerAccount); err != nil {
return nil, err
}
return &timeline{
postIndex: &postIndex{},
preparedPosts: &preparedPosts{},
accountID: accountID,
account: timelineOwnerAccount,
db: db,
filter: visibility.NewFilter(db, log),
tc: typeConverter,
log: log,
}, nil
}
func (t *timeline) Reset() error {
return nil
}
func (t *timeline) PostIndexLength() int {
if t.postIndex == nil || t.postIndex.data == nil {
return 0
}
return t.postIndex.data.Len()
}