[英]Callback with Boto3, Showing Upload Progress
我在 Django/Python 應用程序(使用 Boto3)中遇到文檔存儲功能的情況,我還需要向用戶提供有關上傳進度的信息。
我所看到的直接使用 JS 的方法並非都在瀏覽器中普遍“可用”,我想要的是能夠使用 Boto3 上傳文件,然后還在我的 Django 模板中顯示上傳進度條。
查看此處的文檔: https : //boto3.amazonaws.com/v1/documentation/api/latest/_modules/boto3/s3/transfer.html我不明白如何顯示上傳調用的構建進度ProgressPercentage()
來自模板。
我將如何使用 Boto3 在模板中為我的用戶顯示實際進度?
class ProgressPercentage(object):
def __init__(self, filename):
self._filename = filename
self._size = float(os.path.getsize(filename))
self._seen_so_far = 0
self._lock = threading.Lock()
def __call__(self, bytes_amount):
# To simplify we'll assume this is hooked up
# to a single filename.
with self._lock:
self._seen_so_far += bytes_amount
percentage = (self._seen_so_far / self._size) * 100
sys.stdout.write(
"\r%s %s / %s (%.2f%%)" % (
self._filename, self._seen_so_far, self._size,
percentage))
sys.stdout.flush()
transfer = S3Transfer(boto3.client('s3', 'us-west-2'))
# Upload /tmp/myfile to s3://bucket/key and print upload progress.
transfer.upload_file('/tmp/myfile', 'bucket', 'key',
callback=ProgressPercentage('/tmp/myfile'))
SO中有三個相關的答案:
在 aws boto3 上傳中獲取進度回調(無法使其工作,但看起來很優雅)
使用 boto3 和回調跟蹤 S3 文件的下載進度(這個用於下載,但幫助我了解回調應該是什么樣子)
帶進度條的 S3 Python 下載(有效,我用這個來編寫我的代碼)。
這是我所做的工作:
import boto3
from botocore.exceptions import NoCredentialsError, ClientError
import os
import progressbar
ACCESS_KEY = 'MY_ACCESS_KEY'
SECRET_KEY = 'MY_SECRET_KEY_THAT_I_KNOW_SHOULD_NOT_BE_HERE_BUT_I_HAVENT_IMPLEMENTED_THE_PROPER_WAY_YET_ALSO_I_DO_NOT_KNOW_WHY_I_AM_YELLING_SORRY'
def upload_to_aws(local_file, s3_bucket, s3_folder, s3_filename,force_overwrite='n'):
s3 = boto3.client('s3', aws_access_key_id=ACCESS_KEY,
aws_secret_access_key=SECRET_KEY)
def write_to_aws():
statinfo = os.stat(local_file)
up_progress = progressbar.progressbar.ProgressBar(maxval=statinfo.st_size)
up_progress.start()
def upload_progress(chunk):
up_progress.update(up_progress.currval + chunk)
try:
print("Writting")
s3.upload_file(local_file, s3_bucket, s3_folder+s3_filename, Callback=upload_progress)
print("Upload Successful")
return True
except FileNotFoundError:
print("The source file was not found")
return False
except NoCredentialsError:
print("Credentials not available")
return False
try:
s3.head_object(Bucket=s3_bucket, Key=s3_folder+s3_filename)
if force_overwrite=='y':
write_to_aws
else:
ask_overwrite = input('File already exists at destination. Overwrite?')
if ask_overwrite == 'y':
write_to_aws()
else:
print('leaving application')
except ClientError as e:
write_to_aws()
我知道您可能已經想通了,但是如果其他人在尋找解決方案時發現了這一點,我希望這會有所幫助
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