Google云存储：将字符串上传到GCS时，CRC32C和MD5不匹配

如何解决Google云存储：将字符串上传到GCS时，CRC32C和MD5不匹配

尝试上传JSON字符串并覆盖GCS存储桶中的现有对象时，出现以下错误。

google.api_core.exceptions.BadRequest: 400 POST https://storage.googleapis.com/upload/storage/v1/b/cc-freshdesk/o?uploadType=multipart: {
  "error": {
    "code": 400,"message": "Provided CRC32C \"i8Z/Pw==\" doesn't match calculated CRC32C \"mVn0oQ==\".","errors": [
      {
        "message": "Provided CRC32C \"i8Z/Pw==\" doesn't match calculated CRC32C \"mVn0oQ==\".","domain": "global","reason": "invalid"
      },{
        "message": "Provided MD5 hash \"6NMASNWhbd4WlIj/tWK4Sw==\" doesn't match calculated MD5 hash \"9H5THzsUBARmhzw5NjjgNw==\".","reason": "invalid"
      }
    ]
  }
}
: ('Request failed with status code',400,'Expected one of',<HTTPStatus.OK: 200>)

找到以下代码段：

storage_client = storage.Client()
bucket = storage_client.bucket(bucket_name)
config_blob = bucket.blob(destination_blob_name)
config_blob.upload_from_string(json.dumps(config_data,indent=4),content_type='text/plain')

任何人都可以帮助我了解为什么可能发生此问题。

解决方法

要复制您遇到的错误：

import json
from google.cloud import storage

client = storage.Client()
bucket = client.get_bucket('some-bucket')

# blob1 object
blob1 = bucket.get_blob('file.json')

# downloads content
blob1_string = blob1.download_as_string()

# converts to dict and update content
blob1_obj = json.loads(blob1_string)
blob1_obj['some-key'] = 'some value'

# upload using same blob instance
blob1.upload_from_string(json.dumps(blob1_obj))

# throws error like this `Provided MD5 hash "Ax9olGoqOSb7Nay2LNkCSQ==\" #doesn't match calculated MD5 hash \"XCMPR0o7NdgmI5zN1fMm6Q==\".",

您可能正在使用相同的Blob来下载和上传内容。为防止此错误，您需要创建两个blob实例：

import json
from google.cloud import storage

client = storage.Client()
bucket = client.get_bucket("some-bucket")

# blob1 object -- for downloading contents
blob1 = bucket.get_blob('file.json')

blob1_string = blob1.download_as_string()
# Convert to dictionary
blob1_obj = json.loads(blob1_string)
# Add stuff
blob1_obj['some-key'] = 'some value'

# blob2 object -- for uploading contents
blob2 = bucket.get_blob('file.json')

blob2.upload_from_string(json.dumps(blob1_obj))

# no error

,

以防万一有人在 9 个月后需要这个。 使用两个不同的 blob 不是您通常想要的。很多时候，您必须在两个方向上进行多次读取和写入。所以我会严格不鼓励使用这种方法。 您只需要通过调用“reload()”显式刷新 CRC32 校验和：

Application.DisplayAlerts = False
Application.AskToUpdate = False