Question

我处于使用Django / Python应用程序（使用Boto3）的文档存储功能中，我还需要向用户提供有关上传进度的信息。

我看到的使用直接JS的方法并非在浏览器中普遍都“可用”，我想要的是能够使用Boto3上传文件，然后在Django模板中显示上传进度栏。

在这里查看文档：{{3}}我不理解如何从模板中显示上载调用ProgressPercentage()的构建进度。

如何使用Boto3在模板中为用户显示实际进度？

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'))

Answer 1

SO中有三个相关的答案：

Get progress callback in aws boto3 uploads （无法使其正常运行，但看起来很优雅）
Track download progress of S3 file using boto3 and callbacks （这是供下载，但帮助我了解了回调应该看起来像）
S3 Python Download with Progress Bar （工作，我用这个来编写我的代码）。

这是我所做的工作：

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()

我知道您可能已经知道了，但是如果其他人在寻找解决方案时发现了这一点，希望对您有所帮助

Boto3回调，显示上传进度

1 个答案: