forked from davars/gae
/
taskqueue.go
188 lines (166 loc) · 4.87 KB
/
taskqueue.go
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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 prod
import (
"fmt"
"reflect"
"time"
"go.chromium.org/gae/impl/prod/constraints"
tq "go.chromium.org/gae/service/taskqueue"
"golang.org/x/net/context"
"google.golang.org/appengine"
"google.golang.org/appengine/taskqueue"
)
// useTQ adds a gae.TaskQueue implementation to context, accessible
// by gae.GetTQ(c)
func useTQ(c context.Context) context.Context {
return tq.SetRawFactory(c, func(ci context.Context) tq.RawInterface {
return tqImpl{getAEContext(ci)}
})
}
type tqImpl struct {
aeCtx context.Context
}
func init() {
const taskExpectedFields = 10
// Runtime-assert that the number of fields in the Task structs match, to
// avoid missing additional fields if they're added later.
// all other type assertions are statically enforced by o2n() and tqF2R()
oldType := reflect.TypeOf((*taskqueue.Task)(nil)).Elem()
newType := reflect.TypeOf((*tq.Task)(nil)).Elem()
if oldType.NumField() != newType.NumField() ||
oldType.NumField() != taskExpectedFields {
panic(fmt.Errorf(
"prod/taskqueue:init() field count differs: %d, %d, %d",
oldType.NumField(), newType.NumField(), taskExpectedFields))
}
}
// tqR2F (TQ real-to-fake) converts a *taskqueue.Task to a *tq.Task.
func tqR2F(o *taskqueue.Task) *tq.Task {
if o == nil {
return nil
}
n := tq.Task{}
n.Path = o.Path
n.Payload = o.Payload
n.Header = o.Header
n.Method = o.Method
n.Name = o.Name
n.Delay = o.Delay
n.ETA = o.ETA
n.RetryCount = o.RetryCount
n.RetryOptions = (*tq.RetryOptions)(o.RetryOptions)
return &n
}
// tqF2R (TQ fake-to-real) converts a *tq.Task to a *taskqueue.Task.
func tqF2R(n *tq.Task) *taskqueue.Task {
o := taskqueue.Task{}
o.Path = n.Path
o.Payload = n.Payload
o.Header = n.Header
o.Method = n.Method
o.Name = n.Name
o.Delay = n.Delay
o.ETA = n.ETA
o.RetryCount = n.RetryCount
o.RetryOptions = (*taskqueue.RetryOptions)(n.RetryOptions)
return &o
}
// tqMF2R (TQ multi-fake-to-real) converts []*tq.Task to []*taskqueue.Task.
func tqMF2R(ns []*tq.Task) []*taskqueue.Task {
ret := make([]*taskqueue.Task, len(ns))
for i, t := range ns {
ret[i] = tqF2R(t)
}
return ret
}
// tqMR2F (TQ multi-real-to-fake) converts []*taskqueue.Task to []*tq.Task.
func tqMR2F(ns []*taskqueue.Task) []*tq.Task {
ret := make([]*tq.Task, len(ns))
for i, t := range ns {
ret[i] = tqR2F(t)
}
return ret
}
func (t tqImpl) AddMulti(tasks []*tq.Task, queueName string, cb tq.RawTaskCB) error {
realTasks, err := taskqueue.AddMulti(t.aeCtx, tqMF2R(tasks), queueName)
if err != nil {
if me, ok := err.(appengine.MultiError); ok {
for i, err := range me {
tsk := (*taskqueue.Task)(nil)
if realTasks != nil {
tsk = realTasks[i]
}
cb(tqR2F(tsk), err)
}
err = nil
}
} else {
for _, tsk := range realTasks {
cb(tqR2F(tsk), nil)
}
}
return err
}
func (t tqImpl) DeleteMulti(tasks []*tq.Task, queueName string, cb tq.RawCB) error {
err := taskqueue.DeleteMulti(t.aeCtx, tqMF2R(tasks), queueName)
if me, ok := err.(appengine.MultiError); ok {
for i, err := range me {
if err != nil {
cb(i, err)
}
}
err = nil
}
return err
}
func (t tqImpl) Lease(maxTasks int, queueName string, leaseTime time.Duration) ([]*tq.Task, error) {
tasks, err := taskqueue.Lease(t.aeCtx, maxTasks, queueName, int(leaseTime/time.Second))
if err != nil {
return nil, err
}
return tqMR2F(tasks), nil
}
func (t tqImpl) LeaseByTag(maxTasks int, queueName string, leaseTime time.Duration, tag string) ([]*tq.Task, error) {
tasks, err := taskqueue.LeaseByTag(t.aeCtx, maxTasks, queueName, int(leaseTime/time.Second), tag)
if err != nil {
return nil, err
}
return tqMR2F(tasks), nil
}
func (t tqImpl) ModifyLease(task *tq.Task, queueName string, leaseTime time.Duration) error {
realTask := tqF2R(task)
err := taskqueue.ModifyLease(t.aeCtx, realTask, queueName, int(leaseTime/time.Second))
if err == nil {
task.ETA = realTask.ETA
}
return err
}
func (t tqImpl) Purge(queueName string) error {
return taskqueue.Purge(t.aeCtx, queueName)
}
func (t tqImpl) Stats(queueNames []string, cb tq.RawStatsCB) error {
stats, err := taskqueue.QueueStats(t.aeCtx, queueNames)
if err != nil {
return err
}
for _, s := range stats {
cb((*tq.Statistics)(&s), nil)
}
return nil
}
func (t tqImpl) Constraints() tq.Constraints { return constraints.TQ() }
func (t tqImpl) GetTestable() tq.Testable {
return nil
}