无法将Blob存储文件复制/下载到Azure Functions文件夹

以下是问题详细信息:

  • 我们能够将文件上传到Azure Blob存储。
  • 我们还有一个Azure函数,该函数使用http触发器运行Python(python 3.6)应用程序(engine / init .py)(该函数本质上是获取文件并通过Azure Speaker运行它识别服务)
  • 我们可以在本地计算机上运行代码,并且可以运行。

问题是,当我们将代码移至Azure云(配置为Linux计算机)并希望访问Blob存储中的文件时,该应用程序无法正常工作(返回错误500)。我们已经验证了路径是正确的(源和目标),我们可以在blob存储中看到该文件,但是我们无法读取Blob存储中的文件内容(即,我们无法读取.txt文件中的文本),并且我们无法将文件复制或下载到Azure Function目录中。

文件访问详细信息位于一个名为downloadFile.py的文件中(请参见下面的代码),该文件使用BlockBlobService与Azure Blob存储进行连接。

  • 我们使用block_blob_service.list_blob查找文件
  • 我们使用block_blob_service.get_blob_to_path下载文件

这两个函数在本地计算机上都可以正常工作,因为我们的requirements.txt文件中包含了azure-storage-blob库。

最终,我们的目标是我们需要python App来访问Blob存储中的文件并返回结果。我们对实现这一目标持开放态度。事先感谢您的帮助。

这是requirements.txt文件的内容:

azure-functions
azure-storage-blob == 1.5.0

这是我们的代码(downloadFile.py):

from azure.storage.blob import BlockBlobService,Publicaccess
import os,uuid,sys

def run_sample():
    try:
        # Create the BlockBlockService that is used to call the Blob service for the storage account
        block_blob_service = BlockBlobService(account_name='',account_key='')
        # Create a container called 'quickstartblobs'.
        #container_name ='quickstartblobs'
        container_name ='images'
        #block_blob_service.create_container(container_name)

        # Set the permission so the blobs are public.
        #block_blob_service.set_container_acl(container_name,public_access=Publicaccess.Container)

        # Create a file in Documents to test the upload and download.

        __location__ = os.path.realpath(
        os.path.join(os.getcwd(),os.path.dirname(__file__)))
        #local_path = os.path.join(__location__,'SoundsForJay/')
        local_path = os.path.join(__location__)
        # not able to download file to azure function.


        #local_path=os.path.abspath(os.path.curdir)

        # List the blobs in the container
        print("\nList blobs in the container")
        generator = block_blob_service.list_blobs(container_name)
        for blob in generator:
            print("\t Blob name: " + blob.name)
            if ".wav" in blob.name:
                local_file_name = blob.name

        # Download the blob(s).
        # Add '_DOWNLOADED' as prefix to '.txt' so you can see both files in Documents.

        #full_path_to_file2 = os.path.join(local_path,str.replace(local_file_name,'.txt','_DOWNLOADED.txt'))
        full_path_to_file2 = os.path.join(local_path,'.wav','_DOWNLOADED.wav'))
        print("\nDownloading blob to " + full_path_to_file2)
        block_blob_service.get_blob_to_path(container_name,local_file_name,full_path_to_file2)

        sys.stdout.write("Sample finished running. When you hit <any key>,the sample will be deleted and the sample "
                         "application will exit.")
        sys.stdout.flush()
        #input()

        # Clean up resources. This includes the container and the temp files
        #block_blob_service.delete_container(container_name)
        #os.remove(full_path_to_file)
        #os.remove(full_path_to_file2)
    except Exception as e:
        print(e)
    return "run_sample is running."
APPPA1234 回答:无法将Blob存储文件复制/下载到Azure Functions文件夹

现在,Python Azure功能不允许写入文件,它是只读模式,因此无法更改。因此,您无法使用get_blob_to_path,因为您可以将文件写入磁盘。

因此,如果您只想阅读文本文件的内容,则可以使用以下代码

filename = "test.txt"
account_name = "storage account"
account_key = "account key"

input_container_name="test"
block_blob_service = BlockBlobService(account_name,account_key)
blobstring = block_blob_service.get_blob_to_text(input_container_name,filename).content

您还可以使用函数blob binding读取内容,将inputblob绑定为流。

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

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

if name:
    return func.HttpResponse(inputblob.read(size=-1))
else:
    return func.HttpResponse(
         "Please pass a name on the query string or in the request body",status_code=400
    )

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