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// Copyright 2015 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package featureBreaker
import (
"time"
"golang.org/x/net/context"
tq "go.chromium.org/gae/service/taskqueue"
)
type tqState struct {
*state
c context.Context
tq tq.RawInterface
}
var _ tq.RawInterface = (*tqState)(nil)
func (t *tqState) AddMulti(tasks []*tq.Task, queueName string, cb tq.RawTaskCB) error {
if len(tasks) == 0 {
return nil
}
return t.run(t.c, func() (err error) { return t.tq.AddMulti(tasks, queueName, cb) })
}
func (t *tqState) DeleteMulti(tasks []*tq.Task, queueName string, cb tq.RawCB) error {
if len(tasks) == 0 {
return nil
}
return t.run(t.c, func() error { return t.tq.DeleteMulti(tasks, queueName, cb) })
}
func (t *tqState) Lease(maxTasks int, queueName string, leaseTime time.Duration) (tasks []*tq.Task, err error) {
err = t.run(t.c, func() (err error) {
tasks, err = t.tq.Lease(maxTasks, queueName, leaseTime)
return
})
if err != nil {
tasks = nil
}
return
}
func (t *tqState) LeaseByTag(maxTasks int, queueName string, leaseTime time.Duration, tag string) (tasks []*tq.Task, err error) {
err = t.run(t.c, func() (err error) {
tasks, err = t.tq.LeaseByTag(maxTasks, queueName, leaseTime, tag)
return
})
if err != nil {
tasks = nil
}
return
}
func (t *tqState) ModifyLease(task *tq.Task, queueName string, leaseTime time.Duration) error {
return t.run(t.c, func() error { return t.tq.ModifyLease(task, queueName, leaseTime) })
}
func (t *tqState) Purge(queueName string) error {
return t.run(t.c, func() error { return t.tq.Purge(queueName) })
}
func (t *tqState) Stats(queueNames []string, cb tq.RawStatsCB) error {
return t.run(t.c, func() error { return t.tq.Stats(queueNames, cb) })
}
func (t *tqState) Constraints() tq.Constraints {
return t.tq.Constraints()
}
func (t *tqState) GetTestable() tq.Testable {
return t.tq.GetTestable()
}
// FilterTQ installs a featureBreaker TaskQueue filter in the context.
func FilterTQ(c context.Context, defaultError error) (context.Context, FeatureBreaker) {
state := newState(defaultError)
return tq.AddRawFilters(c, func(ic context.Context, tq tq.RawInterface) tq.RawInterface {
return &tqState{state, ic, tq}
}), state
}