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// Copyright 2016 Google LLC
//
// 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 longrunning
import (
"context"
"fmt"
"time"
"github.com/golang/protobuf/ptypes"
"github.com/golang/protobuf/ptypes/duration"
"github.com/golang/protobuf/ptypes/timestamp"
pb "google.golang.org/genproto/googleapis/longrunning"
)
func bestMomentInHistory() (*Operation, error) {
t, err := time.Parse("2006-01-02 15:04:05.999999999 -0700 MST", "2009-11-10 23:00:00 +0000 UTC")
if err != nil {
return nil, err
}
resp, err := ptypes.TimestampProto(t)
if err != nil {
return nil, err
}
respAny, err := ptypes.MarshalAny(resp)
if err != nil {
return nil, err
}
metaAny, err := ptypes.MarshalAny(ptypes.DurationProto(1 * time.Hour))
return &Operation{
proto: &pb.Operation{
Name: "best-moment",
Done: true,
Metadata: metaAny,
Result: &pb.Operation_Response{
Response: respAny,
},
},
}, err
}
func ExampleOperation_Wait() {
// Complex computation, might take a long time.
op, err := bestMomentInHistory()
if err != nil {
// TODO: Handle err.
}
var ts timestamp.Timestamp
err = op.Wait(context.TODO(), &ts)
if err != nil && !op.Done() {
fmt.Println("failed to fetch operation status", err)
} else if err != nil && op.Done() {
fmt.Println("operation completed with error", err)
} else {
fmt.Println(ptypes.TimestampString(&ts))
}
// Output:
// 2009-11-10T23:00:00Z
}
func ExampleOperation_Metadata() {
op, err := bestMomentInHistory()
if err != nil {
// TODO: Handle err.
}
// The operation might contain metadata.
// In this example, the metadata contains the estimated length of time
// the operation might take to complete.
var meta duration.Duration
if err := op.Metadata(&meta); err != nil {
// TODO: Handle err.
}
d, err := ptypes.Duration(&meta)
if err == ErrNoMetadata {
fmt.Println("no metadata")
} else if err != nil {
// TODO: Handle err.
} else {
fmt.Println(d)
}
// Output:
// 1h0m0s
}
func ExampleOperation_Cancel() {
op, err := bestMomentInHistory()
if err != nil {
// TODO: Handle err.
}
if err := op.Cancel(context.Background()); err != nil {
// TODO: Handle err.
}
}
func ExampleOperation_Delete() {
op, err := bestMomentInHistory()
if err != nil {
// TODO: Handle err.
}
if err := op.Delete(context.Background()); err != nil {
// TODO: Handle err.
}
}
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