114 lines
2.6 KiB
Go
114 lines
2.6 KiB
Go
package main
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import (
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"fmt"
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"os"
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"time"
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"github.com/taosdata/driver-go/v3/af"
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"github.com/taosdata/driver-go/v3/af/tmq"
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tmqcommon "github.com/taosdata/driver-go/v3/common/tmq"
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)
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func main() {
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db, err := af.Open("", "root", "taosdata", "", 0)
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if err != nil {
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panic(err)
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}
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defer db.Close()
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_, err = db.Exec("create database if not exists power WAL_RETENTION_PERIOD 86400")
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if err != nil {
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panic(err)
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}
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_, err = db.Exec("CREATE STABLE IF NOT EXISTS power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (groupId INT, location BINARY(24))")
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if err != nil {
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panic(err)
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}
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_, err = db.Exec("create table if not exists power.d001 using power.meters tags(1,'location')")
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if err != nil {
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panic(err)
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}
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// ANCHOR: create_topic
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_, err = db.Exec("CREATE TOPIC IF NOT EXISTS topic_meters AS SELECT ts, current, voltage, phase, groupid, location FROM power.meters")
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if err != nil {
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panic(err)
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}
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// ANCHOR_END: create_topic
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// ANCHOR: create_consumer
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consumer, err := tmq.NewConsumer(&tmqcommon.ConfigMap{
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"group.id": "test",
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"auto.offset.reset": "latest",
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"td.connect.ip": "127.0.0.1",
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"td.connect.user": "root",
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"td.connect.pass": "taosdata",
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"td.connect.port": "6030",
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"client.id": "test_tmq_client",
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"enable.auto.commit": "false",
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"msg.with.table.name": "true",
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})
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if err != nil {
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panic(err)
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}
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// ANCHOR_END: create_consumer
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// ANCHOR: poll_data
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go func() {
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for {
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_, err = db.Exec("insert into power.d001 values (now, 1.1, 220, 0.1)")
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if err != nil {
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panic(err)
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}
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time.Sleep(time.Millisecond * 100)
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}
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}()
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err = consumer.Subscribe("topic_meters", nil)
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if err != nil {
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panic(err)
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}
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for i := 0; i < 5; i++ {
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ev := consumer.Poll(500)
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if ev != nil {
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switch e := ev.(type) {
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case *tmqcommon.DataMessage:
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fmt.Printf("get message:%v\n", e)
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case tmqcommon.Error:
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fmt.Fprintf(os.Stderr, "%% Error: %v: %v\n", e.Code(), e)
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panic(e)
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}
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consumer.Commit()
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}
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}
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// ANCHOR_END: poll_data
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// ANCHOR: consumer_seek
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partitions, err := consumer.Assignment()
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if err != nil {
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panic(err)
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}
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for i := 0; i < len(partitions); i++ {
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fmt.Println(partitions[i])
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err = consumer.Seek(tmqcommon.TopicPartition{
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Topic: partitions[i].Topic,
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Partition: partitions[i].Partition,
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Offset: 0,
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}, 0)
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if err != nil {
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panic(err)
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}
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}
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partitions, err = consumer.Assignment()
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if err != nil {
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panic(err)
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}
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// ANCHOR_END: consumer_seek
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for i := 0; i < len(partitions); i++ {
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fmt.Println(partitions[i])
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}
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// ANCHOR: consumer_close
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err = consumer.Close()
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if err != nil {
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panic(err)
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}
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// ANCHOR_END: consumer_close
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}
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