weasyprint_lambda
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Published
20 hours ago •
seanfdnn
seanfdnn
Can't load pango
Hi all,
I'm working on getting a Weasyprint lambda set up and followed the instructions shown to try and get it all running.
If anyone reading this has managed to get it working I'd love to see how you did it :)
I also used the commands from pull requests #2 and #4 and have got the layer deployed on Lambda. When I run it I get the error below. I'm running on python 3.7.
I'm deploying this via GitHub actions if that makes any difference.
{
"errorMessage": "cannot load library 'pango-1.0': libthai.so.0: cannot open shared object file: No such file or directory. Additionally, ctypes.util.find_library() did not manage to locate a library called 'pango-1.0'",
"errorType": "OSError",
"stackTrace": [
" File \"/var/lang/lib/python3.7/imp.py\", line 234, in load_module\n return load_source(name, filename, file)\n",
" File \"/var/lang/lib/python3.7/imp.py\", line 171, in load_source\n module = _load(spec)\n",
" File \"<frozen importlib._bootstrap>\", line 696, in _load\n",
" File \"<frozen importlib._bootstrap>\", line 677, in _load_unlocked\n",
" File \"<frozen importlib._bootstrap_external>\", line 728, in exec_module\n",
" File \"<frozen importlib._bootstrap>\", line 219, in _call_with_frames_removed\n",
" File \"/var/task/lambda_handler.py\", line 1, in <module>\n from weasyprint import HTML\n",
" File \"/var/task/weasyprint/__init__.py\", line 469, in <module>\n from .css import preprocess_stylesheet # noqa isort:skip\n",
" File \"/var/task/weasyprint/css/__init__.py\", line 27, in <module>\n from . import computed_values, counters, media_queries\n",
" File \"/var/task/weasyprint/css/computed_values.py\", line 15, in <module>\n from .. import text\n",
" File \"/var/task/weasyprint/text.py\", line 261, in <module>\n 'libpango-1.0.dylib')\n",
" File \"/var/task/weasyprint/text.py\", line 255, in dlopen\n return ffi.dlopen(names[0]) # pragma: no cover\n",
" File \"/var/task/cffi/api.py\", line 150, in dlopen\n lib, function_cache = _make_ffi_library(self, name, flags)\n",
" File \"/var/task/cffi/api.py\", line 832, in _make_ffi_library\n backendlib = _load_backend_lib(backend, libname, flags)\n",
" File \"/var/task/cffi/api.py\", line 827, in _load_backend_lib\n raise OSError(msg)\n"
]
}
My lambda handler is the simplest one I could find:
from weasyprint import HTML
def lambda_handler(event, context):
html = HTML(string='<html><body><h1>Hello, world</h1></body></html>')
html.write_pdf('/tmp/hello_world.pdf')
My requirements.txt file is also as simple as possible:
weasyprint
jinja2
Here are the logs I'm getting out:
START RequestId: a1d4bb8d-a913-4058-9ae7-f1982705865f Version: $LATEST
[ERROR] OSError: cannot load library 'pango-1.0': libthai.so.0: cannot open shared object file: No such file or directory. Additionally, ctypes.util.find_library() did not manage to locate a library called 'pango-1.0'
Traceback (most recent call last):
File "/var/lang/lib/python3.7/imp.py", line 234, in load_module
return load_source(name, filename, file)
File "/var/lang/lib/python3.7/imp.py", line 171, in load_source
module = _load(spec)
File "<frozen importlib._bootstrap>", line 696, in _load
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/var/task/lambda_handler.py", line 1, in <module>
from weasyprint import HTML
File "/var/task/weasyprint/__init__.py", line 469, in <module>
from .css import preprocess_stylesheet # noqa isort:skip
File "/var/task/weasyprint/css/__init__.py", line 27, in <module>
from . import computed_values, counters, media_queries
File "/var/task/weasyprint/css/computed_values.py", line 15, in <module>
from .. import text
File "/var/task/weasyprint/text.py", line 261, in <module>
'libpango-1.0.dylib')
File "/var/task/weasyprint/text.py", line 255, in dlopen
return ffi.dlopen(names[0]) # pragma: no cover
File "/var/task/cffi/api.py", line 150, in dlopen
lib, function_cache = _make_ffi_library(self, name, flags)
File "/var/task/cffi/api.py", line 832, in _make_ffi_library
backendlib = _load_backend_lib(backend, libname, flags)
File "/var/task/cffi/api.py", line 827, in _load_backend_lib
raise OSError(msg)
END RequestId: a1d4bb8d-a913-4058-9ae7-f1982705865f
REPORT RequestId: a1d4bb8d-a913-4058-9ae7-f1982705865f Duration: 5031.58 ms Billed Duration: 5032 ms Memory Size: 128 MB Max Memory Used: 28 MB
Unknown application error occurred
