azure-eventhub-ts

作者原文

Build event streaming applications using Azure Event Hubs SDK for JavaScript (@azure/event-hubs). Use when implementing high-throughput event ingestion, real-time analytics, IoT telemetry, or event-driven architectures with partitioned consumers.

SkillPi 解读

能完成的任务

azure-eventhub-ts

适合谁

按原作者介绍判断适用范围。

输入和输出

以完整原文为准，云端传输需由使用者确认。

软件、账号及付费要求

本包是 azure-eventhub-ts 的 Microsoft Azure SDK 文档与示例，不含已验证的可执行安装程序。使用示例前核对 SDK 包名、版本、Azure 租户/订阅和实际终结点，仅授予本任务所需的最小权限；不把管理员凭据或真实机密写进示例、日志或提交。示例连接的云服务可能接收所选文本、文档、音频、消息、日志或其他输入并产生费用；确认数据范围、脱敏及费用后再连接。创建、更新、删除资源、密钥/权限变更或发送消息须由用户逐项确认，在测试资源上验证，避免生产数据覆盖与不可逆操作。文档中的占位终结点和样例输入必须替换并核对；网站仅核对固定源版本、完整附件和静态/病毒库证据，未运行 SDK、验证外部服务兼容性或授权任何云访问。

限制与区别

原作者介绍原样保留，中文为对应翻译。文档示例未经本站运行；版本、兼容性和效果为作者陈述。

实测状态

未测试

安全评级与访问范围

caution · 静态证据核验，不代表运行安全保证。

本包是 azure-eventhub-ts 的 Microsoft Azure SDK 文档与示例，不含已验证的可执行安装程序。使用示例前核对 SDK 包名、版本、Azure 租户/订阅和实际终结点，仅授予本任务所需的最小权限；不把管理员凭据或真实机密写进示例、日志或提交。示例连接的云服务可能接收所选文本、文档、音频、消息、日志或其他输入并产生费用；确认数据范围、脱敏及费用后再连接。创建、更新、删除资源、密钥/权限变更或发送消息须由用户逐项确认，在测试资源上验证，避免生产数据覆盖与不可逆操作。文档中的占位终结点和样例输入必须替换并核对；网站仅核对固定源版本、完整附件和静态/病毒库证据，未运行 SDK、验证外部服务兼容性或授权任何云访问。

使用前请由宿主核对并授权实际文件读写、外部服务和联网目的地；本站的核验不会授予任何运行权限。

原始 SKILL.md

---
name: azure-eventhub-ts
description: Build event streaming applications using Azure Event Hubs SDK for JavaScript (@azure/event-hubs). Use when implementing high-throughput event ingestion, real-time analytics, IoT telemetry, or event-driven architectures with partitioned consumers.
license: MIT
metadata:
  author: Microsoft
  version: "1.0.0"
  package: '@azure/event-hubs'
---

# Azure Event Hubs SDK for TypeScript

High-throughput event streaming and real-time data ingestion.

## Installation

```bash
npm install @azure/event-hubs @azure/identity
```

For checkpointing with consumer groups:
```bash
npm install @azure/eventhubs-checkpointstore-blob @azure/storage-blob
```

## Environment Variables

```bash
EVENTHUB_NAMESPACE=<namespace>.servicebus.windows.net
EVENTHUB_NAME=my-eventhub
STORAGE_ACCOUNT_NAME=<storage-account>
STORAGE_CONTAINER_NAME=checkpoints
AZURE_TOKEN_CREDENTIALS=prod # Required only if DefaultAzureCredential is used in production
```

## Authentication

```typescript
import { EventHubProducerClient, EventHubConsumerClient } from "@azure/event-hubs";
import { DefaultAzureCredential, ManagedIdentityCredential } from "@azure/identity";

const fullyQualifiedNamespace = process.env.EVENTHUB_NAMESPACE!;
const eventHubName = process.env.EVENTHUB_NAME!;
// Local dev: DefaultAzureCredential. Production: set AZURE_TOKEN_CREDENTIALS=prod or AZURE_TOKEN_CREDENTIALS=<specific_credential>
const credential = new DefaultAzureCredential({requiredEnvVars: ["AZURE_TOKEN_CREDENTIALS"]});
// Or use a specific credential directly in production:
// See https://learn.microsoft.com/javascript/api/overview/azure/identity-readme?view=azure-node-latest#credential-classes
// const credential = new ManagedIdentityCredential();

// Producer
const producer = new EventHubProducerClient(fullyQualifiedNamespace, eventHubName, credential);

// Consumer
const consumer = new EventHubConsumerClient(
  "$Default", // Consumer group
  fullyQualifiedNamespace,
  eventHubName,
  credential
);
```

## Core Workflow

### Send Events

```typescript
const producer = new EventHubProducerClient(namespace, eventHubName, credential);

// Create batch and add events
const batch = await producer.createBatch();
batch.tryAdd({ body: { temperature: 72.5, deviceId: "sensor-1" } });
batch.tryAdd({ body: { temperature: 68.2, deviceId: "sensor-2" } });

await producer.sendBatch(batch);
await producer.close();
```

### Send to Specific Partition

```typescript
// By partition ID
const batch = await producer.createBatch({ partitionId: "0" });

// By partition key (consistent hashing)
const batch = await producer.createBatch({ partitionKey: "device-123" });
```

### Receive Events (Simple)

```typescript
const consumer = new EventHubConsumerClient("$Default", namespace, eventHubName, credential);

const subscription = consumer.subscribe({
  processEvents: async (events, context) => {
    for (const event of events) {
      console.log(`Partition: ${context.partitionId}, Body: ${JSON.stringify(event.body)}`);
    }
  },
  processError: async (err, context) => {
    console.error(`Error on partition ${context.partitionId}: ${err.message}`);
  },
});

// Stop after some time
setTimeout(async () => {
  await subscription.close();
  await consumer.close();
}, 60000);
```

### Receive with Checkpointing (Production)

```typescript
import { EventHubConsumerClient } from "@azure/event-hubs";
import { ContainerClient } from "@azure/storage-blob";
import { BlobCheckpointStore } from "@azure/eventhubs-checkpointstore-blob";

const containerClient = new ContainerClient(
  `https://${storageAccount}.blob.core.windows.net/${containerName}`,
  credential
);

const checkpointStore = new BlobCheckpointStore(containerClient);

const consumer = new EventHubConsumerClient(
  "$Default",
  namespace,
  eventHubName,
  credential,
  checkpointStore
);

const subscription = consumer.subscribe({
  processEvents: async (events, context) => {
    for (const event of events) {
      console.log(`Processing: ${JSON.stringify(event.body)}`);
    }
    // Checkpoint after processing batch
    if (events.length > 0) {
      await context.updateCheckpoint(events[events.length - 1]);
    }
  },
  processError: async (err, context) => {
    console.error(`Error: ${err.message}`);
  },
});
```

### Receive from Specific Position

```typescript
const subscription = consumer.subscribe({
  processEvents: async (events, context) => { /* ... */ },
  processError: async (err, context) => { /* ... */ },
}, {
  startPosition: {
    // Start from beginning
    "0": { offset: "@earliest" },
    // Start from end (new events only)
    "1": { offset: "@latest" },
    // Start from specific offset
    "2": { offset: "12345" },
    // Start from specific time
    "3": { enqueuedOn: new Date("2024-01-01") },
  },
});
```

## Event Hub Properties

```typescript
// Get hub info
const hubProperties = await producer.getEventHubProperties();
console.log(`Partitions: ${hubProperties.partitionIds}`);

// Get partition info
const partitionProperties = await producer.getPartitionProperties("0");
console.log(`Last sequence: ${partitionProperties.lastEnqueuedSequenceNumber}`);
```

## Batch Processing Options

```typescript
const subscription = consumer.subscribe(
  {
    processEvents: async (events, context) => { /* ... */ },
    processError: async (err, context) => { /* ... */ },
  },
  {
    maxBatchSize: 100,           // Max events per batch
    maxWaitTimeInSeconds: 30,    // Max wait for batch
  }
);
```

## Key Types

```typescript
import {
  EventHubProducerClient,
  EventHubConsumerClient,
  EventData,
  ReceivedEventData,
  PartitionContext,
  Subscription,
  SubscriptionEventHandlers,
  CreateBatchOptions,
  EventPosition,
} from "@azure/event-hubs";

import { BlobCheckpointStore } from "@azure/eventhubs-checkpointstore-blob";
```

## Event Properties

```typescript
// Send with properties
const batch = await producer.createBatch();
batch.tryAdd({
  body: { data: "payload" },
  properties: {
    eventType: "telemetry",
    deviceId: "sensor-1",
  },
  contentType: "application/json",
  correlationId: "request-123",
});

// Access in receiver
consumer.subscribe({
  processEvents: async (events, context) => {
    for (const event of events) {
      console.log(`Type: ${event.properties?.eventType}`);
      console.log(`Sequence: ${event.sequenceNumber}`);
      console.log(`Enqueued: ${event.enqueuedTimeUtc}`);
      console.log(`Offset: ${event.offset}`);
    }
  },
});
```

## Error Handling

```typescript
consumer.subscribe({
  processEvents: async (events, context) => {
    try {
      for (const event of events) {
        await processEvent(event);
      }
      await context.updateCheckpoint(events[events.length - 1]);
    } catch (error) {
      // Don't checkpoint on error - events will be reprocessed
      console.error("Processing failed:", error);
    }
  },
  processError: async (err, context) => {
    if (err.name === "MessagingError") {
      // Transient error - SDK will retry
      console.warn("Transient error:", err.message);
    } else {
      // Fatal error
      console.error("Fatal error:", err);
    }
  },
});
```

## Best Practices

1. **Use checkpointing** - Always checkpoint in production for exactly-once processing
2. **Batch sends** - Use `createBatch()` for efficient sending
3. **Partition keys** - Use partition keys to ensure ordering for related events
4. **Consumer groups** - Use separate consumer groups for different processing pipelines
5. **Handle errors gracefully** - Don't checkpoint on processing failures
6. **Close clients** - Always close producer/consumer when done
7. **Monitor lag** - Track `lastEnqueuedSequenceNumber` vs processed sequence

版权与许可声明

    MIT License

    Copyright (c) Microsoft Corporation.

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE