在 aws boto3 上传中获取进度回调

Question

这里有一个关于原始 boto 上传的很好的问题和答案：

如何使用 boto 将文件上传到 S3 存储桶中的目录

其中有一个回调：

k = Key(bucket)
k.key = 'my test file'
k.set_contents_from_filename(testfile,
    cb=percent_cb, num_cb=10)

虽然我看到 boto3 包需要回调：

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.upload_fileobj

我没有看到与 num_cb 参数等效的内容。如何获得upload_fileobj使用 boto3 的进度表？

s3.upload_fileobj(data, 'mybucket', 'mykey')

Answer 1

如果不需要限制调用callback的次数，（而upload_fileobj没办法做到），
1.显示百分比

import os
import boto3

class Test:
    def __init__(self):
        self.total = 0
        self.uploaded = 0
        self.s3 = boto3.client('s3')

    def upload_callback(self, size):
        if self.total == 0:
            return
        self.uploaded += size
        print("{} %".format(int(self.uploaded / self.total * 100)))

    def upload(self, bucket, key, file):
        self.total = os.stat(file).st_size

        with open(file, 'rb') as data:
            self.s3.upload_fileobj(
                data, bucket, key, Callback=self.upload_callback)

2. 使用进度条

import os
import boto3
import progressbar


class Test2:
    def __init__(self):
        self.s3 = boto3.client('s3')

    def upload_callback(self, size):
        self.pg.update(self.pg.currval + size)

    def upload(self, bucket, key, file):
        self.pg = progressbar.progressbar.ProgressBar(
            maxval=os.stat(file).st_size)
        self.pg.start()

        with open(file, 'rb') as data:
            self.s3.upload_fileobj(
                data, bucket, key, Callback=self.upload_callback)