问题描述
我正在从新的nodejs服务器读取现有Azure ServiceBus中的消息。
这是将消息从.NET服务器发送到ServiceBus的方式:
var topicClient = TopicClient.CreateFromConnectionString(serviceBusConnectionString,routingKey);
var brokeredMessage = new BrokeredMessage(message.ToJson());
topicClient.Send(brokeredMessage);
topicClient是Microsoft.ServiceBus.Messaging.TopicClient的地方
我正在使用以下方法使用azure-sb软件包在nodejs服务器上读取消息:
sbClient = ServiceBusClient.createFromConnectionString(connectionString)
subscriptionClient = this.sbClient.createSubscriptionClient(topicName,subscriptionName);
receiver = this.subscriptionClient.createReceiver(ReceiveMode.receiveAndDelete);
messages = await this.receiver.receiveMessages(10,10);
console.log(messages.map(message => { message.body }));
message.body是一个缓冲区,当我执行message.body.toString('utf-8')时,我会得到类似的东西:
@string3http://schemas.microsoft.com/2003/10/Serialization/��{VALID JSON}
我当然对介于两者之间的有效JSON感兴趣。 在.net服务器中,我们只需做brokeredMessage.GetBody()并获取对象,那么nodejs上是否有一种简单的方法可以做到这一点?
解决方法
根据我的测试,如果我们使用标准库Microsoft.Azure.ServiceBus
在.Net应用程序中发送消息,它将直接JSON解析节点应用程序中的消息
例如
这是我发送消息的C#代码:
class Program
{
static void Main(string[] args)
{
string connectionString = "Endpoint=sb://...";
var client = new TopicClient(connectionString,"");
var payload = JsonConvert.SerializeObject(new DemoMessage() { Title = $"hello!!! {DateTime.Now}" });
var serviceBusMessage = new Message(Encoding.UTF8.GetBytes(payload));
serviceBusMessage.SessionId = Guid.NewGuid().ToString("D");
client.SendAsync(serviceBusMessage).Wait();
}
private class DemoMessage
{
public DemoMessage()
{
}
public string Title { get; set; }
}
这是我的Node.js代码,用于接收消息:
const { ServiceBusClient,ReceiveMode } = require("@azure/service-bus");
// Define connection string and related Service Bus entity names here
const connectionString =
"Endpoint=sb://";
const topicName = "***";
const subscriptionName = "***";
async function main() {
const sbClient = ServiceBusClient.createFromConnectionString(
connectionString,);
const subscriptionClient = sbClient.createSubscriptionClient(
topicName,subscriptionName,);
const receiver = subscriptionClient.createReceiver(ReceiveMode.receiveAndDelete);
try {
const messages = await receiver.receiveMessages(1);
console.log("Received messages:");
console.log(messages.map((message) => message.body));
await subscriptionClient.close();
} finally {
await sbClient.close();
}
}
main().catch((err) => {
console.log("Error occurred: ",err);
});
此外,如果您仍然使用库WindowsAzure.ServiceBus
,则需要使用BrokeredMessage(Stream messageBodyStream,bool ownsStream)
来初始化对象。
因为我们使用BrokeredMessage(platload)
进行初始化,所以它将使用带有二进制XmlDictionaryWriter的DataContractSerializer来初始化对象。因此,有效载荷正在使用带有二进制XmlDictionaryWriter的DataContractSerializer进行序列化,这就是解释消息正文为何在其开始时具有类型指示@string3http://schemas.microsoft.com/2003/10/Serialization/
的原因。
例如 这是我的C#代码,用于发送消息:
var client =TopicClient.CreateFromConnectionString(connectionString,"test");
var payload = JsonConvert.SerializeObject(new DemoMessage() { Title = $"hello BrokeredMessage!!! {DateTime.Now}" });
using (Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(payload))) {
var serviceBusMessage = new BrokeredMessage(stream,true);
await client.SendAsync(serviceBusMessage);
}
有关更多详细信息,请参阅here。