Python 3 Flask在Heroku上安装wkhtmltopdf [英] Python 3 flask install wkhtmltopdf on heroku

问题描述

我在heroku python应用程序(烧瓶)上安装wkhtmltopdf二进制文件时遇到问题.

I have a problem to install the wkhtmltopdf binary on my heroku python app (flask).

一年前(python 2)，我已经遇到问题了，但是我可以通过将wkhtmltopdf-pack添加到需求中并将其安装在heroku上，然后将config var设置为WKHTMLTOPDF_BINARY=wkhtmltopdf-pack来解决此问题.这是我的旧线程

A year ago (python 2) I already had an issue, but I was able to solve it by first adding the wkhtmltopdf-pack to the requirements and installing it on heroku and then setting the config var to WKHTMLTOPDF_BINARY=wkhtmltopdf-pack. Here is my old thread

现在的问题:

我正在尝试对python 3使用相同的方法，但是wkhtmltopdf-pack的任何版本均无效，每次推送都被拒绝，我无法安装.

I am trying to use the same approach for python 3, but no version of the wkhtmltopdf-pack works, every push gets rejected and I cant install it.

我在要求中尝试了以下版本:

I tried these versions in the requirements:

wkhtmltopdf-pack==0.12.5

wkhtmltopdf-pack==0.12.4

wkhtmltopdf-pack==0.12.3

wkhtmltopdf-pack==0.12.3.0.post1

wkhtmltopdf-pack==0.12.2.4

我得到这些错误:

No matching distribution

或

error: can't copy 'bin/wkhtmltopdf-pack': doesn't exist or not a regular file

，我记得一旦它告诉我有一个SyntaxError并且它无法解码某些内容.

and I remember once it told me there was a SyntaxError and it could not decode something.

替代方法:

似乎也可以使用buildpack，所以我尝试添加一个buildpack:

It seems it is also possible to use a buildpack, so I tried adding a buildpack:

heroku buildpacks:add https://github.com/dscout/wkhtmltopdf-buildpack.git

我看到已经添加了buildpack，但是没有安装，也没有wkhtmltopdf的配置变量.我不明白如何触发安装，在所有关于buildpack的文档中，其写为​​添加buildpack，您就可以开始使用"了.

I see that the buildpack has been added, but there was no installation and there is also no config var for wkhtmltopdf. I dont understand how to trigger the installation, in all documantations for buildpacks its written "add the buildpack and you are ready to go".

尝试创建PDF会给我一个服务器错误，在这里:

Trying to create a PDF gives me a server error here:

OSError: No wkhtmltopdf executable found: "b''"

我设法安装了buildpack:

I managed to install the buildpack:

推送成功，但是没有创建config var，我也不知道二进制文件的路径是什么.

The push was successful, but no config var has been created and I have no clue what the path to the binary is.

编辑

我能够通过heroku bash查找文件:

I was able to find the files through heroku bash:

app bin dev etc lib lib64 lost + found proc sbin sys tmp usr var

app bin dev etc lib lib64 lost+found proc sbin sys tmp usr var

/ $ cd app
~ $ cd vendor
~/vendor $ dir
wkhtmltox
~/vendor $ cd wkhtmltox
~/vendor/wkhtmltox $ dir
lib
~/vendor/wkhtmltox $ cd lib
~/vendor/wkhtmltox/lib $ dir
libwkhtmltox.so  libwkhtmltox.so.0  libwkhtmltox.so.0.12  libwkhtmltox.so.0.12.3
~/vendor/wkhtmltox/lib $ exit

现在我尝试了所有这些文件，但是都给出了错误:

Now I tried to all these files but all give an error:

OSError: wkhtmltopdf exited with non-zero code -11. error

这是我设置路径的方式:

Here is how I set the path:

# WKHTMLTOPDF config
if 'DYNO' in os.environ:
    print ('loading wkhtmltopdf path on heroku')
    MYDIR = os.path.dirname(__file__)    
    WKHTMLTOPDF_CMD = os.path.join(MYDIR + "/vendor/wkhtmltox/lib/", "libwkhtmltox.so")
else:
    print ('loading wkhtmltopdf path on localhost')
    MYDIR = os.path.dirname(__file__)    
    WKHTMLTOPDF_CMD = os.path.join(MYDIR + "/static/executables/bin/", "wkhtmltopdf.exe")

推荐答案

按照第一种方法，我能够自行解决问题.

I was able to solve the problem on my own, following my first approach.

我在pypi上找到了另一个wkhtmltopdf-pack，并将其添加到我的requirements.txt:

I found an other wkhtmltopdf-pack on pypi and added it to my requirements.txt:

wkhtmltopdf-pack-ng==0.12.3.0

Heroku能够安装此软件包.

Heroku was able to install this pack.

之后，我为wkhtmltopdf添加了config var:

After that I added the config var for wkhtmltopdf:

heroku config:set WKHTMLTOPDF_BINARY=wkhtmltopdf-pack

安装现已完成.我现在需要在我的应用上使用正确的路径:

The installation is now complete. I need to use the correct path now on my app:

if 'DYNO' in os.environ:
    print ('loading wkhtmltopdf path on heroku')
    WKHTMLTOPDF_CMD = subprocess.Popen(
        ['which', os.environ.get('WKHTMLTOPDF_BINARY', 'wkhtmltopdf-pack')], # Note we default to 'wkhtmltopdf' as the binary name
        stdout=subprocess.PIPE).communicate()[0].strip()
else:
    print ('loading wkhtmltopdf path on localhost')
    MYDIR = os.path.dirname(__file__)    
    WKHTMLTOPDF_CMD = os.path.join(MYDIR + "/static/executables/bin/", "wkhtmltopdf.exe")

就这样.

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