Azure Functionsのキュートリガーでキュートリガーが動くが関数が呼び出されないことを調べたメモ

概要

下記のように、関数が何も実行されずポイズンキューに移動したことのみが表示される。

        storageQueueTrigger1: queueTrigger

For detailed output, run func with --verbose flag.
[2024-09-18T23:34:50.594Z] Message has reached MaxDequeueCount of 2. Moving message to queue 'character-queue-poison'.

原因

トリガー側ではなく、キューに入れる側の問題。base64で入れなくてはならない。
分かりにくすぎる、、！

修正

base64エンコードする方法

ソースコード

/* eslint-disable @typescript-eslint/no-explicit-any */
import { ContainerClient } from '@azure/storage-blob';
import { QueueClient } from '@azure/storage-queue';

type SendQueueAndBlobArgs = {
  containerClient: ContainerClient;
  queueClient: QueueClient;
  blobPath: string;
  blobData: string;
  messageTimeToLive: number;
  logger: {
    log: (...args: any[]) => void;
    info: (...args: any[]) => void;
    error: (...args: any[]) => void;
  };
};

export const sendQueueAndBlobContainer = async (
  args: SendQueueAndBlobArgs,
): Promise<void> => {
  const {
    containerClient,
    queueClient,
    blobPath,
    blobData,
    messageTimeToLive,
    logger,
  } = args;

  const blobClient = containerClient.getBlockBlobClient(blobPath);
  const blobResponse = await blobClient.upload(blobData, blobData.length);

  logger.info(
    `Uploaded blob "${blobPath}". Request Id: ${blobResponse.requestId}. Client Request Id: ${blobResponse.clientRequestId}. Container: ${containerClient.containerName}`,
  );

  const queueMessage = {
    containerName: containerClient.containerName,
    blobPath,
  };

  const queueResponse = await queueClient.sendMessage(
-    JSON.stringify(queueMessage),
+    jsonToBase64(queueMessage),
    {
      messageTimeToLive,
    },
  );

  logger.info(
    `Sent message to queue "${queueClient.name}". Message Id: ${queueResponse.messageId}. Request Id: ${queueResponse.requestId}. Client Request Id: ${queueResponse.clientRequestId}`,
  );
};
+ function jsonToBase64(jsonObj: unknown): string {
+   const jsonString = JSON.stringify(jsonObj);
+   return Buffer.from(jsonString).toString('base64');
+ }

参考

Azure Function Queue Trigger V2 がメッセージを読み取らない

別解: host.jsonを編集する方法

host.json

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "excludedTypes": "Request"
      }
    }
  },
  "extensions": {
    "http": {
      "routePrefix": ""
    },
    "queues": {
      "maxDequeueCount": 3,
+      "messageEncoding": "none"
    }
  },
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[4.*, 5.0.0)"
  }
}

参考

host.json設定