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[英]How to use predifined protobuf type (i.e. "google/protobuf/timestamp.proto") with gRPC
[英]Protobuf type for bigquery TIMESTAMP field
我正在使用新的Storage API從 Golang 將數據流式傳輸到 bigquery。 我的 bigquery 表的架構包含一個 TIMESTAMP 字段,如下所示:
bq mk -t mydataset.mytable name:string,lastseen:timestamp
另外,我已經定義了一個這樣的協議緩沖區:
message Row {
string Name = 1;
google.protobuf.Timestamp LastSeen = 3;
}
但是,當我將此數據提交到 BigQuery 時,我收到以下錯誤:
rpc error: code = InvalidArgument desc = The proto field mismatched with BigQuery field at tutorial_Row.LastSeen, the proto field type message, BigQuery field type TIMESTAMP
google.protobuf.Timestamp
protobuf 似乎與 bigquery 中的 TIMESTAMP 類型不對應。 這是有道理的,因為 bigquery 文檔說 TIMESTAMP 包含時區,但google.protobuf.Timestamp
不包含時區。 但是我應該使用哪個協議緩沖區?
我正在使用從這個存儲庫派生的代碼,如下所示:
import (
"context"
"fmt"
"log"
storage "cloud.google.com/go/bigquery/storage/apiv1beta2"
"cloud.google.com/go/bigquery/storage/managedwriter/adapt"
storagepb "google.golang.org/genproto/googleapis/cloud/bigquery/storage/v1beta2"
"google.golang.org/protobuf/proto"
timestamppb "google.golang.org/protobuf/types/known/timestamppb"
)
const (
project = "myproject"
dataset = "mydataset"
table = "mytable2"
)
func main() {
ctx := context.Background()
// the data we will stream to bigquery
var rows = []*Row{
{Name: "John Doe", Age: 104, LastSeen: timestamppb.Now()},
{Name: "Jane Doe", Age: 69, LastSeen: timestamppb.Now()},
{Name: "Adam Smith", Age: 33, LastSeen: timestamppb.Now()},
}
// create the bigquery client
client, err := storage.NewBigQueryWriteClient(ctx)
if err != nil {
log.Fatal(err)
}
defer client.Close()
// create the write stream
// a COMMITTED write stream inserts data immediately into bigquery
resp, err := client.CreateWriteStream(ctx, &storagepb.CreateWriteStreamRequest{
Parent: fmt.Sprintf("projects/%s/datasets/%s/tables/%s", project, dataset, table),
WriteStream: &storagepb.WriteStream{
Type: storagepb.WriteStream_COMMITTED,
},
})
if err != nil {
log.Fatal("CreateWriteStream: ", err)
}
// get the stream by calling AppendRows
stream, err := client.AppendRows(ctx)
if err != nil {
log.Fatal("AppendRows: ", err)
}
// get the protobuf descriptor for our row type
var row Row
descriptor, err := adapt.NormalizeDescriptor(row.ProtoReflect().Descriptor())
if err != nil {
log.Fatal("NormalizeDescriptor: ", err)
}
// serialize the rows
var opts proto.MarshalOptions
var data [][]byte
for _, row := range rows {
buf, err := opts.Marshal(row)
if err != nil {
log.Fatal("protobuf.Marshal: ", err)
}
data = append(data, buf)
}
// send the rows to bigquery
err = stream.Send(&storagepb.AppendRowsRequest{
WriteStream: resp.Name,
Rows: &storagepb.AppendRowsRequest_ProtoRows{
ProtoRows: &storagepb.AppendRowsRequest_ProtoData{
// protocol buffer schema
WriterSchema: &storagepb.ProtoSchema{
ProtoDescriptor: descriptor,
},
// protocol buffer data
Rows: &storagepb.ProtoRows{
SerializedRows: data, // serialized protocol buffer data
},
},
},
})
if err != nil {
log.Fatal("AppendRows.Send: ", err)
}
// get the response, which will tell us whether it worked
_, err = stream.Recv()
if err != nil {
log.Fatal("AppendRows.Recv: ", err)
}
log.Println("done")
}
是的,后端沒有正確解碼原始時間戳消息。
最快的分辨率答案:發送 int64 類型,填充為紀元微秒。
https://cloud.google.com/bigquery/docs/write-api#data_type_conversions
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