CODEWITHSUNDEEP
pythongoogle-app-enginefile-conversion
Insidi0us
Insidi0us

Reputation: 1126

Google App Engine Conversion API failing with BackendError

I am trying to convert html to pdf.
The conversion works fine if I don't include any images, but if I include images it fails with error code 3 and Description BackendError.
I'm referring the image asset included as static/thumb.jpg in my html asset.

def prepare_bar_attachment(bars):
    asset = conversion.Asset('text/html',
                             render_template('bar/print.html',
                                             bars=bars),
                             'print.html')
    thumbnail = None
    if bar.thumbnailurl:
        img_response = urlfetch.fetch(bar.thumbnailurl)
        if img_response.status_code == 200:
            thumbnail = conversion.Asset('image/jpeg', img_response.content,
                                         'thumb.jpg')
    conv = conversion.Conversion(asset, 'application/pdf')
    if thumbnail:
        conv.add_asset(thumbnail)
    result = conversion.convert(conv)
    if result.assets:
        attachment = [('Bars.pdf', result.assets[0].data)]
    else:
        attachment = []
        app.logger.error('Error Code: %s\nDescription\%s'%\
                             (result.error_code, result.error_text))
    return attachment

Upvotes: 4

Views: 434

Answers (2)

Janusz Skonieczny
Janusz Skonieczny

Reputation: 19030

In my case BackendError was generated when I referenced an image that was not provided as an asset.

The curious thing was that when an image was referenced by a CSS, but the CSS rule did not apply it worked OK.

The error started showing up when HTML changed and and the previously unused CSS rule — referencing a missing image asset — got applied to the new/changed HTML element.

So it is OK to reference missing image assets in CSS as long as these CSS rules are not used themselves.

Upvotes: 0

Robert Kluin
Robert Kluin

Reputation: 8292

This is probably because items you've mapped as static assets in your app.yaml can't be accessed by your app's code. Try either including the image somewhere within your code, or without mapping the images as static in app.yaml.

It sounds like this was because the img src path in the html asset should match the asset path.

Upvotes: 2

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