mirror of
https://github.com/gravitational/teleport.git
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111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
/*
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* Teleport
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* Copyright (C) 2024 Gravitational, Inc.
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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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*/
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package memory
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import (
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"context"
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"github.com/gravitational/trace"
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"github.com/gravitational/teleport/api/types"
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"github.com/gravitational/teleport/lib/backend"
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)
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// AtomicWrite executes a batch of conditional actions atomically s.t. all actions happen if all
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// conditions are met, but no actions happen if any condition fails to hold.
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func (m *Memory) AtomicWrite(ctx context.Context, condacts []backend.ConditionalAction) (revision string, err error) {
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if err := backend.ValidateAtomicWrite(condacts); err != nil {
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return "", trace.Wrap(err)
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}
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m.Lock()
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defer m.Unlock()
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m.removeExpired()
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revision = backend.CreateRevision()
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var includesPut bool
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var events []backend.Event
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for _, ca := range condacts {
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switch ca.Condition.Kind {
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case backend.KindWhatever:
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// no comparison to assert
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case backend.KindExists:
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if !m.tree.Has(&btreeItem{Item: backend.Item{Key: ca.Key}}) {
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return "", trace.Wrap(backend.ErrConditionFailed)
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}
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case backend.KindNotExists:
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if m.tree.Has(&btreeItem{Item: backend.Item{Key: ca.Key}}) {
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return "", trace.Wrap(backend.ErrConditionFailed)
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}
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case backend.KindRevision:
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item, found := m.tree.Get(&btreeItem{Item: backend.Item{
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Key: ca.Key,
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}})
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if !found || item.Item.Revision != ca.Condition.Revision {
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return "", trace.Wrap(backend.ErrConditionFailed)
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}
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default:
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return "", trace.BadParameter("unexpected condition kind %v in conditional action against key %q", ca.Condition.Kind, ca.Key)
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}
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switch ca.Action.Kind {
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case backend.KindNop:
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// no action to be taken
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case backend.KindPut:
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includesPut = true
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event := backend.Event{
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Type: types.OpPut,
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Item: ca.Action.Item,
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}
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event.Item.Key = ca.Key
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event.Item.Revision = revision
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events = append(events, event)
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case backend.KindDelete:
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if m.tree.Has(&btreeItem{Item: backend.Item{Key: ca.Key}}) {
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// only bother creating delete event if there is actually an
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// item to delete.
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event := backend.Event{
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Type: types.OpDelete,
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Item: backend.Item{
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Key: ca.Key,
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},
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}
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events = append(events, event)
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}
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default:
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return "", trace.BadParameter("unexpected action kind %v in conditional action against key %q", ca.Action.Kind, ca.Key)
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}
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}
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for _, event := range events {
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m.processEvent(event)
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if !m.EventsOff {
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m.buf.Emit(event)
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}
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}
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if !includesPut {
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return "", nil
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}
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return revision, nil
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}
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