topicwriter

Documentation

Index

• type Message
• type Partitioning
• type Writer
  • func NewWriter(writer *topicwriterinternal.Writer) *Writer
  • func (w *Writer) Close(ctx context.Context) error
  • func (w *Writer) Write(ctx context.Context, messages ...Message) error

Examples

• Writer.Write

Types

type Message

type Message = topicwriterinternal.Message

type Partitioning

type Partitioning = topicwriterinternal.PublicPartitioning

type Writer

type Writer struct {
	// contains filtered or unexported fields
}

Writer represent write session to topic It handles connection problems, reconnect to server when need and resend buffered messages

func NewWriter

func NewWriter(writer *topicwriterinternal.Writer) *Writer

func (*Writer) Close

func (w *Writer) Close(ctx context.Context) error

func (*Writer) Write

func (w *Writer) Write(ctx context.Context, messages ...Message) error

Write send messages to topic return fast in async mode (default) and wait ack from server in sync mode. see topicoptions.WithSyncWrite

The method will wait first initial connection even for async mode, that mean first write may be slower. especially when connection has problems.

ctx cancelation mean cancel of wait ack only, it will not cancel of send messages

Experimental

Notice: This API is EXPERIMENTAL and may be changed or removed in a later release.

Example

ctx := context.Background()
db, err := ydb.Open(ctx, os.Getenv("YDB_CONNECTION_STRING"))
if err != nil {
	log.Fatalf("failed ydb connection: %v", err)
}

writer, err := db.Topic().StartWriter("producer-id", "topicName",
	topicoptions.WithWriterCompressorCount(1),
)
if err != nil {
	log.Fatalf("failed to create topic writer: %v", err)
}

err = writer.Write(ctx,
	topicwriter.Message{Data: strings.NewReader("1")},
	topicwriter.Message{Data: strings.NewReader("2")},
	topicwriter.Message{Data: strings.NewReader("3")},
)
if err == nil {
	fmt.Println("OK")
} else {
	log.Fatalf("failed write to stream")
}