forked from dapr/components-contrib
/
servicebusqueues.go
105 lines (89 loc) · 2.69 KB
/
servicebusqueues.go
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// ------------------------------------------------------------
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
// ------------------------------------------------------------
package servicebusqueues
import (
"context"
"encoding/json"
"time"
servicebus "github.com/Azure/azure-service-bus-go"
"github.com/dapr/components-contrib/bindings"
)
const (
correlationID = "correlationID"
label = "label"
id = "id"
)
// AzureServiceBusQueues is an input/output binding reading from and sending events to Azure Service Bus queues
type AzureServiceBusQueues struct {
metadata *serviceBusQueuesMetadata
client *servicebus.Queue
}
type serviceBusQueuesMetadata struct {
ConnectionString string `json:"connectionString"`
QueueName string `json:"queueName"`
}
// NewAzureServiceBusQueues returns a new AzureServiceBusQueues instance
func NewAzureServiceBusQueues() *AzureServiceBusQueues {
return &AzureServiceBusQueues{}
}
// Init parses connection properties and creates a new Service Bus Queue client
func (a *AzureServiceBusQueues) Init(metadata bindings.Metadata) error {
meta, err := a.parseMetadata(metadata)
if err != nil {
return err
}
a.metadata = meta
ns, err := servicebus.NewNamespace(servicebus.NamespaceWithConnectionString(a.metadata.ConnectionString))
if err != nil {
return err
}
client, err := ns.NewQueue(a.metadata.QueueName)
if err != nil {
return err
}
a.client = client
return nil
}
func (a *AzureServiceBusQueues) parseMetadata(metadata bindings.Metadata) (*serviceBusQueuesMetadata, error) {
b, err := json.Marshal(metadata.Properties)
if err != nil {
return nil, err
}
var m serviceBusQueuesMetadata
err = json.Unmarshal(b, &m)
if err != nil {
return nil, err
}
return &m, nil
}
func (a *AzureServiceBusQueues) Write(req *bindings.WriteRequest) error {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
msg := servicebus.NewMessage(req.Data)
if val, ok := req.Metadata[id]; ok && val != "" {
msg.ID = val
}
if val, ok := req.Metadata[correlationID]; ok && val != "" {
msg.CorrelationID = val
}
err := a.client.Send(ctx, msg)
return err
}
func (a *AzureServiceBusQueues) Read(handler func(*bindings.ReadResponse) error) error {
var sbHandler servicebus.HandlerFunc = func(ctx context.Context, msg *servicebus.Message) error {
err := handler(&bindings.ReadResponse{
Data: msg.Data,
Metadata: map[string]string{id: msg.ID, correlationID: msg.CorrelationID, label: msg.Label},
})
if err == nil {
return msg.Complete(ctx)
}
return msg.Abandon(ctx)
}
if err := a.client.Receive(context.Background(), sbHandler); err != nil {
return err
}
return nil
}