topic

package
v3.34.0-rc1 Latest Latest
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Published: Aug 16, 2022 License: Apache-2.0 Imports: 4 Imported by: 0

Documentation

Overview

Example (Topic_read_message)
ctx := context.TODO()
db, err := ydb.Open(ctx, "grpcs://localhost:2135/local")
if err != nil {
	fmt.Printf("failed connect: %v", err)
	return
}
defer db.Close(ctx) // cleanup resources

reader, err := db.Topic().StartReader("consumer", topicoptions.ReadTopic("/topic/path"))
if err != nil {
	fmt.Printf("failed start reader: %v", err)
	return
}

for {
	mess, err := reader.ReadMessage(ctx)
	if err != nil {
		fmt.Printf("failed start reader: %v", err)
		return
	}

	content, err := ioutil.ReadAll(mess)
	if err != nil {
		fmt.Printf("failed start reader: %v", err)
		return
	}
	fmt.Println(string(content))
}
Output:

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type Client

type Client interface {
	// Close stop client
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	Close(context.Context) error

	// Alter change topic options
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	Alter(ctx context.Context, path string, opts ...topicoptions.AlterOption) error

	// Create create topic
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	Create(ctx context.Context, path string, codecs []topictypes.Codec, opts ...topicoptions.CreateOption) error

	// Describe describe topic
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	Describe(ctx context.Context, path string, opts ...topicoptions.DescribeOption) (topictypes.TopicDescription, error)

	// Drop drop topic
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	Drop(ctx context.Context, path string, opts ...topicoptions.DropOption) error

	// StartReader start read messages from topic
	// it is fast non block call, connection starts in background
	//
	// Experimental
	//
	// Notice: This API is EXPERIMENTAL and may be changed or removed in a
	// later release.
	StartReader(
		consumer string,
		readSelectors topicoptions.ReadSelectors,
		opts ...topicoptions.ReaderOption,
	) (*topicreader.Reader, error)
}

Client is interface for topic client

Experimental

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

Directories

Path Synopsis
Package topicreader provide Reader to receive messages from YDB topics More examples in examples repository
Package topicreader provide Reader to receive messages from YDB topics More examples in examples repository

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