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// 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 admin
import (
"context"
"slices"
"sync"
"time"
"github.com/superseriousbusiness/gotosocial/internal/db"
"github.com/superseriousbusiness/gotosocial/internal/gtscontext"
"github.com/superseriousbusiness/gotosocial/internal/gtserror"
"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
"github.com/superseriousbusiness/gotosocial/internal/log"
"github.com/superseriousbusiness/gotosocial/internal/workers"
)
func errActionConflict(action *gtsmodel.AdminAction) gtserror.WithCode {
err := gtserror.NewfAt(
4, // Include caller's function name.
"an action (%s) is currently running (duration %s) which conflicts with the attempted action",
action.Key(), time.Since(action.CreatedAt),
)
const help = "wait until this action is complete and try again"
return gtserror.NewErrorConflict(err, err.Error(), help)
}
type Actions struct {
// Map of running actions.
running map[string]*gtsmodel.AdminAction
// Lock for running admin actions.
//
// Not embedded struct, to shield
// from access by outside packages.
m sync.Mutex
// DB for storing, updating,
// deleting admin actions etc.
db db.DB
// Workers for queuing
// admin action side effects.
workers *workers.Workers
}
func New(db db.DB, workers *workers.Workers) *Actions {
return &Actions{
running: make(map[string]*gtsmodel.AdminAction),
db: db,
workers: workers,
}
}
type ActionF func(context.Context) gtserror.MultiError
// Run runs the given admin action by executing the supplied function.
//
// Run handles locking, action insertion and updating, so you don't have to!
//
// If an action is already running which overlaps/conflicts with the
// given action, an ErrorWithCode 409 will be returned.
//
// If execution of the provided function returns errors, the errors
// will be updated on the provided admin action in the database.
func (a *Actions) Run(
ctx context.Context,
adminAction *gtsmodel.AdminAction,
f ActionF,
) gtserror.WithCode {
actionKey := adminAction.Key()
// LOCK THE MAP HERE, since we're
// going to do some operations on it.
a.m.Lock()
// Bail if an action with
// this key is already running.
running, ok := a.running[actionKey]
if ok {
a.m.Unlock()
return errActionConflict(running)
}
// Action with this key not
// yet running, create it.
if err := a.db.PutAdminAction(ctx, adminAction); err != nil {
err = gtserror.Newf("db error putting admin action %s: %w", actionKey, err)
// Don't store in map
// if there's an error.
a.m.Unlock()
return gtserror.NewErrorInternalError(err)
}
// Action was inserted,
// store in map.
a.running[actionKey] = adminAction
// UNLOCK THE MAP HERE, since
// we're done modifying it for now.
a.m.Unlock()
go func() {
// Use a background context with existing values.
ctx = gtscontext.WithValues(context.Background(), ctx)
// Run the thing and collect errors.
if errs := f(ctx); errs != nil {
adminAction.Errors = make([]string, 0, len(errs))
for _, err := range errs {
adminAction.Errors = append(adminAction.Errors, err.Error())
}
}
// Action is no longer running:
// remove from running map.
a.m.Lock()
delete(a.running, actionKey)
a.m.Unlock()
// Mark as completed in the db,
// storing errors for later review.
adminAction.CompletedAt = time.Now()
if err := a.db.UpdateAdminAction(ctx, adminAction, "completed_at", "errors"); err != nil {
log.Errorf(ctx, "db error marking action %s as completed: %q", actionKey, err)
}
}()
return nil
}
// GetRunning sounds like a threat, but it actually just
// returns all of the currently running actions held by
// the Actions struct, ordered by ID descending.
func (a *Actions) GetRunning() []*gtsmodel.AdminAction {
a.m.Lock()
defer a.m.Unlock()
// Assemble all currently running actions.
running := make([]*gtsmodel.AdminAction, 0, len(a.running))
for _, action := range a.running {
running = append(running, action)
}
// Order by ID descending (creation date).
slices.SortFunc(
running,
func(a *gtsmodel.AdminAction, b *gtsmodel.AdminAction) int {
const k = -1
switch {
case a.ID > b.ID:
return +k
case a.ID < b.ID:
return -k
default:
return 0
}
},
)
return running
}
// TotalRunning is a sequel to the classic
// 1972 environmental-themed science fiction
// film Silent Running, starring Bruce Dern.
func (a *Actions) TotalRunning() int {
a.m.Lock()
defer a.m.Unlock()
return len(a.running)
}
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