https://github.com/kubemq-io/kubemq-go
go library for kubemq server
https://github.com/kubemq-io/kubemq-go
client docker go kubemq kubernetes kubernetes-cluster message-broker message-queue
Last synced: 26 days ago
JSON representation
go library for kubemq server
- Host: GitHub
- URL: https://github.com/kubemq-io/kubemq-go
- Owner: kubemq-io
- License: apache-2.0
- Created: 2018-12-12T23:45:54.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2024-12-22T11:55:01.000Z (6 months ago)
- Last Synced: 2025-04-14T13:17:36.899Z (about 2 months ago)
- Topics: client, docker, go, kubemq, kubernetes, kubernetes-cluster, message-broker, message-queue
- Language: Go
- Size: 377 KB
- Stars: 49
- Watchers: 7
- Forks: 16
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# KubeMQ Go SDK
The **KubeMQ SDK for Go** enables Go developers to seamlessly communicate with the [KubeMQ](https://kubemq.io/) server, implementing various communication patterns such as Events, EventStore, Commands, Queries, and Queues.
## Table of Contents
* [KubeMQ Go SDK](#kubemq-go-sdk)
* [Table of Contents](#table-of-contents)
* [Prerequisites](#prerequisites)
* [Installation](#installation)
* [Running Examples](#running-examples)
* [SDK Overview](#sdk-overview)
* [PubSub Events Operations](#pubsub-events-operations)
* [Create Channel](#create-channel)
* [Request Parameters](#request-parameters)
* [Response](#response)
* [Example](#example)
* [Delete Channel](#delete-channel)
* [Request Parameters](#request-parameters-1)
* [Response](#response-1)
* [Example](#example-1)
* [List Channels](#list-channels)
* [Request Parameters](#request-parameters-2)
* [Response](#response-2)
* [Example](#example-2)
* [Send Event / Subscribe Message](#send-event--subscribe-message)
* [Send Request: `Event`](#send-request-event)
* [Send Response](#send-response)
* [Subscribe Request: `EventsSubscription`](#subscribe-request-eventssubscription)
* [Example](#example-3)
* [PubSub EventsStore Operations](#pubsub-eventsstore-operations)
* [Create Channel](#create-channel-1)
* [Request Parameters](#request-parameters-3)
* [Response](#response-3)
* [Example](#example-4)
* [Delete Channel](#delete-channel-1)
* [Request Parameters](#request-parameters-4)
* [Response](#response-4)
* [Example](#example-5)
* [List Channels](#list-channels-1)
* [Request Parameters](#request-parameters-5)
* [Response](#response-5)
* [Example](#example-6)
* [Send Event / Subscribe Message](#send-event--subscribe-message-1)
* [Send Request: `Event`](#send-request-event-1)
* [Send Response](#send-response-1)
* [Subscribe Request: `EventsStoreSubscription`](#subscribe-request-eventsstoresubscription)
* [EventsStoreType Options](#eventsstoretype-options)
* [Example](#example-7)
* [Commands & Queries – Commands Operations](#commands--queries--commands-operations)
* [Create Channel](#create-channel-2)
* [Request Parameters](#request-parameters-6)
* [Response](#response-6)
* [Example](#example-8)
* [Delete Channel](#delete-channel-2)
* [Request Parameters](#request-parameters-7)
* [Response](#response-7)
* [Example](#example-9)
* [List Channels](#list-channels-2)
* [Request Parameters](#request-parameters-8)
* [Response](#response-8)
* [Example](#example-10)
* [Send Command / Receive Request](#send-command--receive-request)
* [Send Request: `CommandMessage`](#send-request-commandmessage-)
* [Send Response: `CommandResponseMessage`](#send-response-commandresponsemessage-)
* [Receive Request: `CommandsSubscription`](#receive-request-commandssubscription)
* [Example](#example-11)
* [Commands & Queries – Queries Operations](#commands--queries--queries-operations)
* [Create Channel](#create-channel-3)
* [Request Parameters](#request-parameters-9)
* [Response](#response-9)
* [Example](#example-12)
* [Delete Channel](#delete-channel-3)
* [Request Parameters](#request-parameters-10)
* [Response](#response-10)
* [Example](#example-13)
* [List Channels](#list-channels-3)
* [Request Parameters](#request-parameters-11)
* [Response](#response-11)
* [Example](#example-14)
* [Send Query / Receive Request](#send-query--receive-request)
* [Send Request: `QueryMessage`](#send-request-querymessage)
* [Send Response: `QueryResponse`](#send-response-queryresponse)
* [Receive Request: `QuerySubscription`](#receive-request-querysubscription)
* [Example](#example-15)
* [Queues Operations](#queues-operations)
* [Create Channel](#create-channel-4)
* [Request Parameters](#request-parameters-12)
* [Response](#response-12)
* [Example](#example-16)
* [Delete Channel](#delete-channel-4)
* [Request Parameters](#request-parameters-13)
* [Response](#response-13)
* [Example](#example-17)
* [List Channels](#list-channels-4)
* [Request Parameters](#request-parameters-14)
* [Response](#response-14)
* [Example](#example-18)
* [Send / Receive Queue Messages](#send--receive-queue-messages)
* [Send Request: `QueueMessage`](#send-request-queuemessage-)
* [Send Response: `SendResult`](#send-response-sendresult-)
* [Receive Request: `PollRequest`](#receive-request-pollrequest)
* [Response: `PollResponse`](#response-pollresponse)
* [Response: `QueueMessage`](#response-queuemessage-)
* [Example](#example-19)
* [Example with Visibility](#example-with-visibility)
## Prerequisites
- Go SDK 1.17 higher
- KubeMQ server running locally or accessible over the network
## Installation
```bash
go get github.com/kubemq-io/kubemq-go
```
## Running Examples
The [examples](https://github.com/kubemq-io/kubemq-go/tree/master/examples) are standalone projects that showcase the usage of the SDK. To run the examples, ensure you have a running instance of KubeMQ.
## SDK Overview
The SDK implements all communication patterns available through the KubeMQ server:
- PubSub
- Events
- EventStore
- Commands & Queries (CQ)
- Commands
- Queries
- Queues
## PubSub Events Operations
### Create Channel
Create a new Events channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|---------|-----------------------------------------|---------------|-----------|
| Ctx | context | The context for the request. | None | Yes |
| ChannelName | String | Name of the channel you want to create | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func createEventsChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsClient, err := kubemq.NewEventsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-channel-creator"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := eventsClient.Create(ctx, "events-channel"); err != nil {
log.Fatal(err)
}
}
```
### Delete Channel
Delete an existing Events channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|-----------------------------------------|---------------|-----------|
| ChannelName | String | Name of the channel you want to delete | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func deleteEventsChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsClient, err := kubemq.NewEventsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-channel-delete"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := eventsClient.Delete(ctx, "events-channel"); err != nil {
log.Fatal(err)
}
}
```
### List Channels
Retrieve a list of Events channels.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|--------------------------------------------|---------------|-----------|
| SearchQuery | String | Search query to filter channels (optional) | None | No |
#### Response
Returns a list where each `PubSubChannel` has the following attributes:
| Name | Type | Description |
|--------------|-------------|-----------------------------------------------------------------------------------------------|
| Name | String | The name of the Pub/Sub channel. |
| Type | String | The type of the Pub/Sub channel. |
| LastActivity | long | The timestamp of the last activity on the channel, represented in milliseconds since epoch. |
| IsActive | boolean | Indicates whether the channel is active or not. |
| Incoming | PubSubStats | The statistics related to incoming messages for this channel. |
| Outgoing | PubSubStats | The statistics related to outgoing messages for this channel. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func listEventsChannels() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsClient, err := kubemq.NewEventsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-channel-lister"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
channels, err := eventsClient.List(ctx, "")
if err != nil {
log.Fatal(err)
}
for _, channel := range channels {
log.Println(channel)
}
}
```
### Send Event / Subscribe Message
Sends a message to an Events channel.
#### Send Request: `Event`
| Name | Type | Description | Default Value | Mandatory |
|----------|---------------------|------------------------------------------------------------|------------------|-----------|
| Id | String | Unique identifier for the event message. | None | No |
| Channel | String | The channel to which the event message is sent. | None | Yes |
| Metadata | String | Metadata associated with the event message. | None | No |
| Body | byte[] | Body of the event message in bytes. | Empty byte array | No |
| Tags | Map | Tags associated with the event message as key-value pairs. | Empty Map | No |
#### Send Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Subscribe Request: `EventsSubscription`
| Name | Type | Description | Default Value | Mandatory |
|------------------------|--------------------------------|----------------------------------------------------------------------|---------------|-----------|
| Channel | String | The channel to subscribe to. | None | Yes |
| Group | String | The group to subscribe with. | None | No |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
"time"
)
func sendSubscribeEvents() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsClient, err := kubemq.NewEventsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-send-subscribe"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
subReq := &kubemq.EventsSubscription{
Channel: "events-channel",
Group: "",
ClientId: "",
}
err = eventsClient.Subscribe(ctx, subReq, func(msg *kubemq.Event, err error) {
log.Println(msg.String())
})
if err != nil {
log.Fatal(err)
}
time.Sleep(300 * time.Second)
err = eventsClient.Send(ctx, &kubemq.Event{
Channel: "events-channel",
Metadata: "some-metadata",
Body: []byte("hello kubemq - sending event"),
})
if err != nil {
log.Fatal(err)
}
time.Sleep(1 * time.Second)
}
```
## PubSub EventsStore Operations
### Create Channel
Create a new Events Store channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|---------|-----------------------------------------|---------------|-----------|
| Ctx | context | The context for the request. | None | Yes |
| ChannelName | String | Name of the channel you want to create | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func createEventsStoreChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsStoreClient, err := kubemq.NewEventsStoreClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-store-channel-creator"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsStoreClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := eventsStoreClient.Create(ctx, "events-store-channel"); err != nil {
log.Fatal(err)
}
}
```
### Delete Channel
Delete an existing Events Store channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|-----------------------------------------|---------------|-----------|
| ChannelName | String | Name of the channel you want to delete | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func deleteEventsStoreChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsStoreClient, err := kubemq.NewEventsStoreClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-store-channel-delete"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsStoreClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := eventsStoreClient.Delete(ctx, "events-store-channel"); err != nil {
log.Fatal(err)
}
}
```
### List Channels
Retrieve a list of Events channels.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|--------------------------------------------|---------------|-----------|
| SearchQuery | String | Search query to filter channels (optional) | None | No |
#### Response
Returns a list where each `PubSubChannel` has the following attributes:
| Name | Type | Description |
|--------------|-------------|-----------------------------------------------------------------------------------------------|
| Name | String | The name of the Pub/Sub channel. |
| Type | String | The type of the Pub/Sub channel. |
| LastActivity | long | The timestamp of the last activity on the channel, represented in milliseconds since epoch. |
| IsActive | boolean | Indicates whether the channel is active or not. |
| Incoming | PubSubStats | The statistics related to incoming messages for this channel. |
| Outgoing | PubSubStats | The statistics related to outgoing messages for this channel. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func listEventsStoreChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsStoreClient, err := kubemq.NewEventsStoreClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-store-channel-lister"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsStoreClient.Close()
if err != nil {
log.Fatal(err)
}
}()
channels, err := eventsStoreClient.List(ctx, "")
if err != nil {
log.Fatal(err)
}
for _, channel := range channels {
log.Println(channel)
}
}
```
### Send Event / Subscribe Message
Sends a message to an Events channel.
#### Send Request: `Event`
| Name | Type | Description | Default Value | Mandatory |
|----------|---------------------|------------------------------------------------------------|------------------|-----------|
| Id | String | Unique identifier for the event message. | None | No |
| Channel | String | The channel to which the event message is sent. | None | Yes |
| Metadata | String | Metadata associated with the event message. | None | No |
| Body | byte[] | Body of the event message in bytes. | Empty byte array | No |
| Tags | Map | Tags associated with the event message as key-value pairs. | Empty Map | No |
#### Send Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Subscribe Request: `EventsStoreSubscription`
| Name | Type | Description | Default Value | Mandatory |
|------------------------|--------------------------------|------------------------------|---------------|-----------|
| Channel | String | The channel to subscribe to. | None | Yes |
| Group | String | The group to subscribe with. | None | No |
| SubscriptionType | EventsStoreSubscription | The Subscription | None | Yes |
#### EventsStoreType Options
| Type | Value | Description |
|-------------------|-------|--------------------------------------------------------------------|
| StartNewOnly | 1 | Start storing events from the point when the subscription is made |
| StartFromFirst | 2 | Start storing events from the first event available |
| StartFromLast | 3 | Start storing events from the last event available |
| StartAtSequence | 4 | Start storing events from a specific sequence number |
| StartAtTime | 5 | Start storing events from a specific point in time |
| StartAtTimeDelta | 6 | Start storing events from a specific time delta in seconds |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
"time"
)
func sendSubscribeEventsStore() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
eventsStoreClient, err := kubemq.NewEventsStoreClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("events-store-send-subscribe"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := eventsStoreClient.Close()
if err != nil {
log.Fatal(err)
}
}()
subReq := &kubemq.EventsStoreSubscription{
Channel: "events-store-channel",
Group: "",
ClientId: "",
SubscriptionType: kubemq.StartFromFirstEvent(),
}
err = eventsStoreClient.Subscribe(ctx, subReq, func(msg *kubemq.EventStoreReceive, err error) {
log.Println(msg.String())
})
if err != nil {
log.Fatal(err)
}
time.Sleep(1 * time.Second)
result, err := eventsStoreClient.Send(ctx, &kubemq.EventStore{
Channel: "events-store-channel",
Metadata: "some-metadata",
Body: []byte("hello kubemq - sending event store"),
})
if err != nil {
log.Fatal(err)
}
log.Println(result)
time.Sleep(1 * time.Second)
}
```
## Commands & Queries – Commands Operations
### Create Channel
Create a new Command channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|---------|-----------------------------------------|---------------|-----------|
| Ctx | context | The context for the request. | None | Yes |
| ChannelName | String | Name of the channel you want to create | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func createCommandsChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
commandsClient, err := kubemq.NewCommandsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := commandsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := commandsClient.Create(ctx, "commands.A"); err != nil {
log.Fatal(err)
}
}
```
### Delete Channel
Delete an existing Command channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|-----------------------------------------|---------------|-----------|
| ChannelName | String | Name of the channel you want to delete | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func deleteCommandsChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
commandsClient, err := kubemq.NewCommandsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := commandsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := commandsClient.Delete(ctx, "commands.A"); err != nil {
log.Fatal(err)
}
}
```
### List Channels
Retrieve a list of Command channels.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|--------------------------------------------|---------------|-----------|
| SearchQuery | String | Search query to filter channels (optional) | None | No |
#### Response
Returns a list where each `CQChannel` has the following attributes:
| Name | Type | Description |
|--------------|-------------|-----------------------------------------------------------------------------------------------|
| Name | String | The name of the Pub/Sub channel. |
| Type | String | The type of the Pub/Sub channel. |
| LastActivity | long | The timestamp of the last activity on the channel, represented in milliseconds since epoch. |
| IsActive | boolean | Indicates whether the channel is active or not. |
| Incoming | PubSubStats | The statistics related to incoming messages for this channel. |
| Outgoing | PubSubStats | The statistics related to outgoing messages for this channel. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func listCommandsChannels() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
commandsClient, err := kubemq.NewCommandsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := commandsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
channels, err := commandsClient.List(ctx, "")
if err != nil {
log.Fatal(err)
}
for _, channel := range channels {
log.Println(channel)
}
}
```
### Send Command / Receive Request
Sends a command request to a Command channel.
#### Send Request: `CommandMessage`
| Name | Type | Description | Default Value | Mandatory |
|----------------|---------------------|----------------------------------------------------------------------------------------|-------------------|-----------|
| Id | String | The ID of the command message. | None | Yes |
| Channel | String | The channel through which the command message will be sent. | None | Yes |
| Metadata | String | Additional metadata associated with the command message. | None | No |
| Body | byte[] | The body of the command message as bytes. | Empty byte array | No |
| Tags | Map | A dictionary of key-value pairs representing tags associated with the command message. | Empty Map | No |
| Timeout | Duration | The maximum time duration for waiting to response. | None | Yes |
#### Send Response: `CommandResponseMessage`
| Name | Type | Description |
|------------------|---------|------------------------------------------------------|
| CommandId | String | Command Id |
| ResponseClientId | String | The client ID associated with the command response. |
| Executed | boolean | Indicates if the command has been executed. |
| ExecutedAt | time | The timestamp when the command response was created. |
| Error | String | The error message if there was an error. |
#### Receive Request: `CommandsSubscription`
| Name | Type | Description | Default Value | Mandatory |
|--------------------------|----------------------------------|-----------------------------------------------|---------------|-----------|
| Channel | String | The channel for the subscription. | None | Yes |
| Group | String | The group associated with the subscription. | None | No |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
"time"
)
func sendReceiveCommands() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
commandsClient, err := kubemq.NewCommandsClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("sendReceiveCommands"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := commandsClient.Close()
if err != nil {
log.Fatal(err)
}
}()
subRequest := &kubemq.CommandsSubscription{
Channel: "commands",
ClientId: "",
Group: "",
}
log.Println("subscribing to commands")
err = commandsClient.Subscribe(ctx, subRequest, func(cmd *kubemq.CommandReceive, err error) {
log.Println(cmd.String())
resp := &kubemq.Response{
RequestId: cmd.Id,
ResponseTo: cmd.ResponseTo,
Metadata: "some-metadata",
ExecutedAt: time.Now(),
}
if err := commandsClient.Response(ctx, resp); err != nil {
log.Fatal(err)
}
})
if err != nil {
log.Fatal(err)
}
time.Sleep(1 * time.Second)
log.Println("sending command")
result, err := commandsClient.Send(ctx, kubemq.NewCommand().
SetChannel("commands").
SetMetadata("some-metadata").
SetBody([]byte("hello kubemq - sending command")).
SetTimeout(time.Duration(10)*time.Second))
if err != nil {
log.Fatal(err)
}
log.Println(result)
}
```
## Commands & Queries – Queries Operations
### Create Channel
Create a new Query channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|---------|-----------------------------------------|---------------|-----------|
| Ctx | context | The context for the request. | None | Yes |
| ChannelName | String | Name of the channel you want to create | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func createQueriesChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queriesClient, err := kubemq.NewQueriesClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queriesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := queriesClient.Create(ctx, "queries.A"); err != nil {
log.Fatal(err)
}
}
```
### Delete Channel
Delete an existing Query channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|-----------------------------------------|---------------|-----------|
| ChannelName | String | Name of the channel you want to delete | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func deleteQueriesChannel() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queriesClient, err := kubemq.NewQueriesClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queriesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := queriesClient.Delete(ctx, "queries.A"); err != nil {
log.Fatal(err)
}
}
```
### List Channels
Retrieve a list of Query channels.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|--------------------------------------------|---------------|-----------|
| SearchQuery | String | Search query to filter channels (optional) | None | No |
#### Response
Returns a list where each `CQChannel` has the following attributes:
| Name | Type | Description |
|--------------|-------------|-----------------------------------------------------------------------------------------------|
| Name | String | The name of the Pub/Sub channel. |
| Type | String | The type of the Pub/Sub channel. |
| LastActivity | long | The timestamp of the last activity on the channel, represented in milliseconds since epoch. |
| IsActive | boolean | Indicates whether the channel is active or not. |
| Incoming | PubSubStats | The statistics related to incoming messages for this channel. |
| Outgoing | PubSubStats | The statistics related to outgoing messages for this channel. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
)
func listQueriesChannels() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queriesClient, err := kubemq.NewQueriesClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queriesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
channels, err := queriesClient.List(ctx, "")
if err != nil {
log.Fatal(err)
}
for _, channel := range channels {
log.Println(channel)
}
}
```
### Send Query / Receive Request
Sends a query request to a Query channel.
#### Send Request: `QueryMessage`
| Name | Type | Description | Default Value | Mandatory |
|----------------|---------------------|----------------------------------------------------------------------------------------|-------------------|-----------|
| Id | String | The ID of the query message. | None | Yes |
| Channel | String | The channel through which the query message will be sent. | None | Yes |
| Metadata | String | Additional metadata associated with the query message. | None | No |
| Body | byte[] | The body of the query message as bytes. | Empty byte array | No |
| Tags | Map | A dictionary of key-value pairs representing tags associated with the query message. | Empty Map | No |
| Timeout | Duration | The maximum time duration for waiting to response. | None | Yes |
#### Send Response: `QueryResponse`
| Name | Type | Description |
|------------------|---------------------|-----------------------------------------------------------------------------------------------|
| QueryId | String | Query Id |
| ResponseClientId | String | The client ID associated with the query response. |
| Executed | boolean | Indicates if the query has been executed. |
| Metadata | String | Additional metadata associated with the query response message. | None | No |
| Body | byte[] | The body of the query response message as bytes. | Empty byte array | No |
| Tags | Map | A dictionary of key-value pairs representing tags associated with the query response message. | Empty Map | No |
| ExecutedAt | time | The timestamp when the query response was created. |
| Error | String | The error message if there was an error. |
#### Receive Request: `QuerySubscription`
| Name | Type | Description | Default Value | Mandatory |
|--------------------------|----------------------------------|-----------------------------------------------|---------------|-----------|
| Channel | String | The channel for the subscription. | None | Yes |
| Group | String | The group associated with the subscription. | None | No |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go"
"log"
"time"
)
func sendReceiveQueries() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queriesClient, err := kubemq.NewQueriesClient(ctx,
kubemq.WithAddress("localhost", 50000),
kubemq.WithClientId("sendReceiveQueries"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queriesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
subRequest := &kubemq.QueriesSubscription{
Channel: "queries",
ClientId: "",
Group: "",
}
log.Println("subscribing to queries")
err = queriesClient.Subscribe(ctx, subRequest, func(query *kubemq.QueryReceive, err error) {
log.Println(query.String())
resp := &kubemq.Response{
RequestId: query.Id,
ResponseTo: query.ResponseTo,
Metadata: "some-metadata",
ExecutedAt: time.Now(),
Body: []byte("hello kubemq - sending query response"),
}
if err := queriesClient.Response(ctx, resp); err != nil {
log.Fatal(err)
}
})
if err != nil {
log.Fatal(err)
}
time.Sleep(1 * time.Second)
log.Println("sending query")
result, err := queriesClient.Send(ctx, kubemq.NewQuery().
SetChannel("queries").
SetMetadata("some-metadata").
SetBody([]byte("hello kubemq - sending query")).
SetTimeout(time.Duration(10)*time.Second))
if err != nil {
log.Fatal(err)
}
log.Println(result)
}
```
## Queues Operations
### Create Channel
Create a new Queue channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|---------|-----------------------------------------|---------------|-----------|
| Ctx | context | The context for the request. | None | Yes |
| ChannelName | String | Name of the channel you want to create | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go/queues_stream"
"log"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := queuesClient.Create(ctx, "queues.A"); err != nil {
log.Fatal(err)
}
}
```
### Delete Channel
Delete an existing Queue channel.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|-----------------------------------------|---------------|-----------|
| ChannelName | String | Name of the channel you want to delete | None | Yes |
#### Response
| Name | Type | Description |
|------|---------|--------------------------------|
| Err | error | Error message if any |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go/queues_stream"
"log"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
if err := queuesClient.Delete(ctx, "queues.A"); err != nil {
log.Fatal(err)
}
}
```
### List Channels
Retrieve a list of Queue channels.
#### Request Parameters
| Name | Type | Description | Default Value | Mandatory |
|-------------|--------|--------------------------------------------|---------------|-----------|
| SearchQuery | String | Search query to filter channels (optional) | None | No |
#### Response
Returns a list where each `QueuesChannel` has the following attributes:
| Name | Type | Description |
|--------------|-------------|-----------------------------------------------------------------------------------------------|
| Name | String | The name of the Pub/Sub channel. |
| Type | String | The type of the Pub/Sub channel. |
| LastActivity | long | The timestamp of the last activity on the channel, represented in milliseconds since epoch. |
| IsActive | boolean | Indicates whether the channel is active or not. |
| Incoming | PubSubStats | The statistics related to incoming messages for this channel. |
| Outgoing | PubSubStats | The statistics related to outgoing messages for this channel. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go/queues_stream"
"log"
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
channels, err := queuesClient.List(ctx, "")
if err != nil {
log.Fatal(err)
}
for _, channel := range channels {
log.Println(channel)
}
}
```
### Send / Receive Queue Messages
Send and receive messages from a Queue channel.
#### Send Request: `QueueMessage`
| Name | Type | Description | Default Value | Mandatory |
|-------------------------|---------------------|-----------------------------------------------------------------------------------------------------|-----------------|-----------|
| Id | String | The unique identifier for the message. | None | No |
| Channel | String | The channel of the message. | None | Yes |
| Metadata | String | The metadata associated with the message. | None | No |
| Body | byte[] | The body of the message. | new byte[0] | No |
| Tags | Map | The tags associated with the message. | new HashMap<>() | No |
| PolicyDelaySeconds | int | The delay in seconds before the message becomes available in the queue. | None | No |
| PolicyExpirationSeconds | int | The expiration time in seconds for the message. | None | No |
| PolicyMaxReceiveCount | int | The number of receive attempts allowed for the message before it is moved to the dead letter queue. | None | No |
| PolicyMaxReceiveQueue | String | The dead letter queue where the message will be moved after reaching the maximum receive attempts. | None | No |
#### Send Response: `SendResult`
| Name | Type | Description |
|-----------|-----------------|---------------------------------------------------------------|
| Id | String | The unique identifier of the message. |
| SentAt | LocalDateTime | The timestamp when the message was sent. |
| ExpiredAt | LocalDateTime | The timestamp when the message will expire. |
| DelayedTo | LocalDateTime | The timestamp when the message will be delivered. |
| IsError | boolean | Indicates if there was an error while sending the message. |
| Error | String | The error message if `isError` is true. |
#### Receive Request: `PollRequest`
| Name | Type | Description | Default Value | Mandatory |
|-------------------|---------|----------------------------------------------------|---------------|-----------|
| Channel | String | The channel to poll messages from. | None | Yes |
| MaxItems | int | The maximum number of messages to poll. | 1 | No |
| WaitTimeout | int | The wait timeout in seconds for polling messages. | 60 | No |
| AutoAck | boolean | Indicates if messages should be auto-acknowledged. | false | No |
| VisibilitySeconds | int | Add a visibility timeout feature for messages. | 0 | No |
#### Response: `PollResponse`
| Name | Type | Description |
|----------|----------------------------|---------------------------------------------------------|
| Messages | List | The list of received queue messages. |
##### Response: `QueueMessage`
| Name | Type | Description |
|------------------------|---------------------------------------|---------------------------------------------------------|
| Id | String | The unique identifier for the message. |
| Channel | String | The channel from which the message was received. |
| Metadata | String | Metadata associated with the message. |
| Body | byte[] | The body of the message in byte array format. |
| ClientID | String | The ID of the client that sent the message. |
| Tags | Map`` | Key-value pairs representing tags for the message. |
| Timestamp | Instant | The timestamp when the message was created. |
| Sequence | long | The sequence number of the message. |
| ReceiveCount | int | The number of times the message has been received. |
| ReRouted | boolean | Indicates whether the message was rerouted. |
| ReRoutedFromQueue | String | The name of the queue from which the message was rerouted.|
| ExpirationAt | Instant | The expiration time of the message, if applicable. |
| DelayedTo | Instant | The time the message is delayed until, if applicable. |
#### Example
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go/queues_stream"
"log"
"time"
)
func sendAndReceive() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
msg := queues_stream.NewQueueMessage().
SetId("message_id").
SetChannel("sendAndReceive").
SetMetadata("some-metadata").
SetBody([]byte("hello world from KubeMQ queue")).
SetTags(map[string]string{
"key1": "value1",
"key2": "value2",
}).
SetPolicyDelaySeconds(1).
SetPolicyExpirationSeconds(10).
SetPolicyMaxReceiveCount(3).
SetPolicyMaxReceiveQueue("dlq")
result, err := queuesClient.Send(ctx, msg)
if err != nil {
log.Fatal(err)
}
log.Println(result)
pollRequest := queues_stream.NewPollRequest().
SetChannel("sendAndReceive").
SetMaxItems(1).
SetWaitTimeout(10).
SetAutoAck(true)
msgs, err := queuesClient.Poll(ctx, pollRequest)
//if err != nil {
// log.Fatal(err)
//}
//AckAll - Acknowledge all messages
//if err := msgs.AckAll(); err != nil {
// log.Fatal(err)
//}
//NackAll - Not Acknowledge all messages
//if err := msgs.NAckAll(); err != nil {
// log.Fatal(err)
//}
// RequeueAll - Requeue all messages
//if err := msgs.ReQueueAll("requeue-queue-channel"); err != nil {
// log.Fatal(err)
//}
for _, msg := range msgs.Messages {
log.Println(msg.String())
// Ack - Acknowledge message
if err := msg.Ack(); err != nil {
log.Fatal(err)
}
// Nack - Not Acknowledge message
//if err := msg.NAck(); err != nil {
// log.Fatal(err)
//}
// Requeue - Requeue message
//if err := msg.ReQueue("requeue-queue-channel"); err != nil {
// log.Fatal(err)
//}
}
}
```
#### Example with Visibility
```go
package main
import (
"context"
"github.com/kubemq-io/kubemq-go/queues_stream"
"log"
"time"
)
func sendAndReceiveWithVisibilityExpiration() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
msg := queues_stream.NewQueueMessage().
SetId("message_id").
SetChannel("sendAndReceiveWithVisibility").
SetMetadata("some-metadata").
SetBody([]byte("hello world from KubeMQ queue - with visibility"))
result, err := queuesClient.Send(ctx, msg)
if err != nil {
log.Fatal(err)
}
log.Println(result)
pollRequest := queues_stream.NewPollRequest().
SetChannel("sendAndReceiveWithVisibility").
SetMaxItems(1).
SetWaitTimeout(10).
SetVisibilitySeconds(2)
msgs, err := queuesClient.Poll(ctx, pollRequest)
for _, msg := range msgs.Messages {
log.Println(msg.String())
log.Println("Received message, waiting 3 seconds before ack")
time.Sleep(3 * time.Second)
if err := msg.Ack(); err != nil {
log.Fatal(err)
}
}
}
func sendAndReceiveWithVisibilityExtension() {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
queuesClient, err := queues_stream.NewQueuesStreamClient(ctx,
queues_stream.WithAddress("localhost", 50000),
queues_stream.WithClientId("example"))
if err != nil {
log.Fatal(err)
}
defer func() {
err := queuesClient.Close()
if err != nil {
log.Fatal(err)
}
}()
msg := queues_stream.NewQueueMessage().
SetId("message_id").
SetChannel("sendAndReceiveWithVisibility").
SetMetadata("some-metadata").
SetBody([]byte("hello world from KubeMQ queue - with visibility"))
result, err := queuesClient.Send(ctx, msg)
if err != nil {
log.Fatal(err)
}
log.Println(result)
pollRequest := queues_stream.NewPollRequest().
SetChannel("sendAndReceiveWithVisibility").
SetMaxItems(1).
SetWaitTimeout(10).
SetVisibilitySeconds(2)
msgs, err := queuesClient.Poll(ctx, pollRequest)
for _, msg := range msgs.Messages {
log.Println(msg.String())
log.Println("Received message, waiting 1 seconds before ack")
time.Sleep(1 * time.Second)
log.Println("Extending visibility for 3 seconds and waiting 2 seconds before ack")
if err := msg.ExtendVisibility(3); err != nil {
log.Fatal(err)
}
time.Sleep(2 * time.Second)
if err := msg.Ack(); err != nil {
log.Fatal(err)
}
}
}
```