我正在尝试修复我在生产中遇到的图像旋转错误，但没有进入开发中。被困了几天，非常感谢任何对如何解决这个问题有任何见解的人的帮助！
==上下文==
我正在编写一个具有个人资料图片上传功能的 Django 网络应用程序。为了克服自拍EXIF问题(方向不正确(，我添加了一个使用保存后接收器旋转图像的功能。它在开发中效果很好(当图像在本地保存和存储时(，但现在我已经转移到生产环境(Heroku 服务器;将图像保存在 S3 存储桶中(，该函数会抛出 FileNotFound 错误 - [Errno 2] 没有这样的文件或目录："https://db-devsite1.s3.amazonaws.com/media/uploadImage/81c01af5-030f-42ed-b413-91eb8941675b.JPG"，即使它是图像的正确文件路径。其他一切仍然很好。
==视图==
def rotateimage (request):
if request.method == 'POST':
form = uploadImageForm(request.POST, request.FILES)
if form.is_valid():
form.save()
return redirect('rotateimage')
else:
form = uploadImageForm()
==型号==
import os
from django.db import models
from catalog.utilities import rotate_image
from django.urls import reverse
from io import BytesIO
from django.core.files import File
from PIL import Image, ExifTags
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.conf import settings
class uploadImage(models.Model):
uploadImage = models.ImageField(upload_to='uploadImage', blank=True, null=True)
thumbnail = models.ImageField(upload_to='rotateImage', blank=True, null=True)
@receiver(post_save, sender=uploadImage, dispatch_uid="update_image_profile")
def update_image(sender, instance, **kwargs):
if instance.uploadImage:
fullpath = settings.MEDIA_ROOT + instance.uploadImage.url
rotate_image(fullpath)
==实用工具==
from PIL import Image, ExifTags
def rotate_image(filepath):
dev_test = "Off"
if dev_test == "Off":
try:
image = Image.open(filepath)
for orientation in ExifTags.TAGS.keys():
if ExifTags.TAGS[orientation] == 'Orientation':
break
exif = dict(image._getexif().items())
if exif[orientation] == 3:
image = image.rotate(180, expand=True)
elif exif[orientation] == 6:
image = image.rotate(270, expand=True)
elif exif[orientation] == 8:
image = image.rotate(90, expand=True)
image.save(filepath)
image.close()
except (AttributeError, KeyError, IndexError):
# cases: image don't have getexif
pass
else:
try:
image = Image.open(filepath)
image = image.rotate(180, expand=True)
image.save(filepath)
image.close()
except (AttributeError, KeyError, IndexError):
# cases: image don't have getexif
pass
==设置==
import os
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
AWS_LOCATION = 'static'
AWS_ACCESS_KEY_ID = CONFIG['AWS_ACCESS_KEY_ID']
AWS_SECRET_ACCESS_KEY = CONFIG['AWS_SECRET_ACCESS_KEY']
AWS_STORAGE_BUCKET_NAME = CONFIG['AWS_STORAGE_BUCKET_NAME']
AWS_S3_CUSTOM_DOMAIN='%s.s3.amazonaws.com' % AWS_STORAGE_BUCKET_NAME
AWS_S3_OBJECT_PARAMETERS = {
'CacheControl': 'max-age=86400',
}
DEFAULT_FILE_STORAGE = 'dbDevSite.storage_backends.MediaStorage'
STATICFILES_STORAGE = "storages.backends.s3boto3.S3Boto3Storage"
STATICFILES_DIRS = [
os.path.join(BASE_DIR, 'catalog/static'),
]
STATIC_URL='https://%s/%s/' % (AWS_S3_CUSTOM_DOMAIN, AWS_LOCATION)
ADMIN_MEDIA_PREFIX = STATIC_URL + 'admin/'
STATICFILES_FINDERS = ('django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder',)
AWS_DEFAULT_ACL = None
AWS_PRELOAD_METADATA=True
MEDIA_URL = '/media/'
MEDIA_ROOT = os.path.join(BASE_DIR, 'catalog/static/media')
# Heroku: Update database configuration from $DATABASE_URL.
import dj_database_url
db_from_env = dj_database_url.config(conn_max_age=500)
DATABASES['default'].update(db_from_env)
编辑 - 更新为完全错误
Environment:
Request Method: POST
Request URL: https://db-devsite.herokuapp.com/catalog/rotateimage
Django Version: 3.0.1
Python Version: 3.8.0
Installed Applications:
['django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'catalog.apps.CatalogConfig',
'storages']
Installed Middleware:
['django.middleware.security.SecurityMiddleware',
'django.contrib.sessions.middleware.SessionMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware']
Traceback (most recent call last):
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/handlers/exception.py", line 34, in inner
response = get_response(request)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/handlers/base.py", line 115, in _get_response
response = self.process_exception_by_middleware(e, request)
File "/app/.heroku/python/lib/python3.8/site-packages/django/core/handlers/base.py", line 113, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/app/catalog/views.py", line 18, in rotateimage
form.save()
File "/app/.heroku/python/lib/python3.8/site-packages/django/forms/models.py", line 459, in save
self.instance.save()
File "/app/.heroku/python/lib/python3.8/site-packages/django/db/models/base.py", line 745, in save
self.save_base(using=using, force_insert=force_insert,
File "/app/.heroku/python/lib/python3.8/site-packages/django/db/models/base.py", line 793, in save_base
post_save.send(
File "/app/.heroku/python/lib/python3.8/site-packages/django/dispatch/dispatcher.py", line 173, in send
return [
File "/app/.heroku/python/lib/python3.8/site-packages/django/dispatch/dispatcher.py", line 174, in <listcomp>
(receiver, receiver(signal=self, sender=sender, **named))
File "/app/catalog/models.py", line 31, in update_image
rotate_image(fullpath)
File "/app/catalog/utilities.py", line 9, in rotate_image
image = Image.open(filepath)
File "/app/.heroku/python/lib/python3.8/site-packages/PIL/Image.py", line 2766, in open
fp = builtins.open(filename, "rb")
Exception Type: FileNotFoundError at /catalog/rotateimage
Exception Value: [Errno 2] No such file or directory: 'https://db-devsite1.s3.amazonaws.com/media/uploadImage/81c01af5-030f-42ed-b413-91eb8941675b_Kupxl37.JPG'
编辑 这里是有效的保存后函数的代码解决方案
@receiver(post_save, sender=uploadImage, dispatch_uid="update_image_profile")
def update_image(sender, instance, **kwargs):
if instance.uploadImage:
# Download instance.uploadImage from S3 to temp folder
s3_client = boto3.client('s3')
bucket_name = settings.AWS_STORAGE_BUCKET_NAME
subfolder_name = 'media/'
target_image = str(instance.uploadImage)
image_path = subfolder_name + target_image
image_name = '/tmp/image.jpg'
s3_client.download_file(bucket_name, image_path, image_name)
# Rotate image in temp folder
rotate_image(image_name)
# Upload rotated image from temp folder back to S3
s3_client.upload_file(image_name, bucket_name, image_path)
如果您的代码成功处理了旋转，那么唯一缺少的步骤就是下载/上传图像。
要下载：
import boto3
s3_client = boto3.client('s3')
s3_client.download_file('mybucket', 'user1.jpg', '/tmp/image.jpg')
然后，使用现有代码旋转图像，最后将其上传到所需的目标：
s3_client.upload_file('/tmp/image.jpg', 'mybucket', 'user1.jpg')