Azure 函数未写入图像文件

如何解决Azure 函数未写入图像文件

我是 azure 函数应用程序的新手。我正在开发一个应用程序来生成 wordcloud，为此，我正在从 Cosmos DB 获取我的数据。使用 VS Code 在本地一切正常。当我在 azure 函数应用程序上部署我的 azure 函数时，部署成功，在浏览器中，我收到以下消息。

This HTTP-triggered function was executed successfully. Pass a name in the query string or the request body for a personalized response.

表示部署成功。但是当我传递 Query 参数并调用 get_wordcloud 函数时，它会抛出 500 Internal Server Error。我的猜测是它无法在 Azure 环境中写入映像文件。以下是我的 __init__.py 文件：

import logging

import azure.functions as func

from azure.cosmos import CosmosClient
import os

from pandas import json_normalize

from wordcloud import WordCloud,STOPWORDS

from PIL import Image


def main(req: func.HttpRequest) -> func.HttpResponse:
    logging.info('Python HTTP trigger function processed a request.')

    db_name = req.params.get('db_name')
    container_name = req.params.get('container_name')
    if not db_name and not container_name:
        try:
            req_body = req.get_json()
        except ValueError:
            pass
        else:
            db_name = req_body.get('db_name')
            container_name = req_body.get('container_name')

    if db_name and container_name:
        url = os.environ.get('ACCOUNT_URI')
        
        key = os.environ.get('ACCOUNT_KEY')

        client = CosmosClient(url,credential=key)

        database = client.get_database_client(db_name)
        container = database.get_container_client(container_name)
        print(database)
        print(container)

        query = 'SELECT * FROM c'
        result = list(container.query_items(
            query,enable_cross_partition_query=True))

        df = json_normalize(result)
        stopwords = set(STOPWORDS)
        wordcloud = WordCloud(
            background_color='white',stopwords=stopwords,max_words=500,width=1080,height=640,).generate(str(df))
        wordcloud.to_file("wordcloud_result.png")
        file = open(u'wordcloud_result.png','rb')
        result = file.read()
        return func.HttpResponse(result)
    else:
        return func.HttpResponse(
            "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response.",status_code=200
        )

下面是function.json文件：

{
  "scriptFile": "__init__.py","bindings": [
    {
      "authLevel": "function","type": "httpTrigger","direction": "in","name": "req","methods": [
        "get","post"
      ]
    },{
      "type": "http","direction": "out","name": "$return"
    }
  ]
}

在 __init__.py 中，当我替换以下代码时

wordcloud.to_file("wordcloud_result.png")
file = open(u'wordcloud_result.png','rb')
result = file.read()
return func.HttpResponse(result)

使用以下代码

return func.HttpResponse('Successful')

它运行成功。

解决方法

不是 python 用户，但我注意到你没有标题内容类型（应用程序/八位字节流），你应该返回一个 StreamContent...看看你的问题的这个版本C# How do I return a blob from a HTTP triggered Azure Function?