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main.go
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main.go
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
// beam-playground:
// name: adding-timestamp
// description: Adding timestamp example.
// multifile: false
// context_line: 82
// categories:
// - Quickstart
// complexity: ADVANCED
// tags:
// - hellobeam
package main
import (
"context"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/graph/mtime"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"time"
)
// Commit represents data about a git commit message.
type Commit struct {
Datetime time.Time
Message string
}
var (
commits = []Commit{
{
Datetime: time.Date(2020, 7, 31, 15, 52, 5, 0, time.UTC),
Message: "3c6c45924a Remove trailing whitespace from README",
},
{
Datetime: time.Date(2020, 7, 31, 15, 59, 40, 0, time.UTC),
Message: "a52be99b62 Merge pull request #12443 from KevinGG/whitespace",
},
{
Datetime: time.Date(2020, 7, 31, 16, 7, 36, 0, time.UTC),
Message: "7c1772d13f Merge pull request #12439 from ibzib/beam-9199-1",
},
{
Datetime: time.Date(2020, 7, 31, 16, 35, 41, 0, time.UTC),
Message: "d971ba13b8 Widen ranges for GCP libraries (#12198)",
},
{
Datetime: time.Date(2020, 8, 1, 0, 7, 25, 0, time.UTC),
Message: "875620111b Enable all Jenkins jobs triggering for committers (#12407)",
},
}
)
func CreateCommits(s beam.Scope) beam.PCollection {
return beam.CreateList(s, commits)
}
// ApplyTransform applies a beam.EventTime timestamp to PCollection<Commit> elements.
func ApplyTransform(s beam.Scope, input beam.PCollection) beam.PCollection {
return beam.ParDo(s, func(element Commit) (beam.EventTime, Commit) {
return mtime.FromTime(element.Datetime), element
}, input)
}
func main() {
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
input := CreateCommits(s)
result := ApplyTransform(s, input)
beam.ParDo0(s, func(et beam.EventTime, commit Commit) {
t := time.Unix(0, int64(et.Milliseconds())*1e6)
log.Infof(ctx, "time: %s, message: %s", t.Format("03:04"), commit)
}, result)
err := beamx.Run(ctx, p)
if err != nil {
log.Exitf(context.Background(), "Failed to execute job: %v", err)
}
}