Blender not recognizing crc32c library in add-on #106963

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opened 2023-04-14 19:01:25 +02:00 by Ryan-Silverman · 2 comments

Ryan-Silverman commented

2023-04-14 19:01:25 +02:00

System Information
Operating system: macOS Big Sur
Graphics card: N/A

Blender Version
Broken: 3.0, 3.5
Worked: None

Short description of error
I am creating an add-on using the crc32c library. However, if I try to install it without doing anything else, I receive an error because Blender does not recognize the library. However, if I install a version of my add-on without the crc32c library, uninstall it, and then install my add-on with crc32c it works. However, this only works for the duration that Blender is open, once I close it crc32c no longer works again.

Exact steps for others to reproduce the error
Create a python add-on with the crc32c library ("import crc32c") and try to load it into Blender

**System Information** Operating system: macOS Big Sur Graphics card: N/A **Blender Version** Broken: 3.0, 3.5 Worked: None **Short description of error** I am creating an add-on using the crc32c library. However, if I try to install it without doing anything else, I receive an error because Blender does not recognize the library. However, if I install a version of my add-on without the crc32c library, uninstall it, and then install my add-on with crc32c it works. However, this only works for the duration that Blender is open, once I close it crc32c no longer works again. **Exact steps for others to reproduce the error** Create a python add-on with the crc32c library ("import crc32c") and try to load it into Blender

blenderpluginRYAN.zip

19 KiB

Ryan-Silverman added the

labels 2023-04-14 19:01:26 +02:00

Iliya Katushenock added the

label 2023-04-15 10:07:46 +02:00

Roman Markov commented

2023-04-15 17:22:47 +02:00

It is not a Blender problem. site.getusersitepackages() was even included into sys.path by default recently: 72c012ab4a
It is in 3.5: 1be25cfff1/source/blender/python/intern/bpy_interface.c (L374-L381)

But you still have to check and install libraries.

bl_info = {
    "name": "test crc32c",
    "author": "",
    "version": (0, 0, 1),
    "blender": (2, 80, 0),
    "location": "",
    "description": "",
    "warning": "",
    "doc_url": "",
    "category": "Generic",
}

def ensure_site_packages(packages: list, directory: str):
    """ 
    `packages`: list of tuples (<import name>, <pip name>)
    `directory`: a folder for site packages, will be created if does not exist and added to `sys.path`
    """

    if not packages:
        return

    import bpy
    import os
    import sys
    import importlib
    import importlib.util

    os.makedirs(directory, exist_ok = True)

    if not directory in sys.path:
        sys.path.append(directory)

    modules_to_install = [module[1] for module in packages if not importlib.util.find_spec(module[0])]
    if not modules_to_install:
        return

    if bpy.app.version < (2,91,0):
        python_binary = bpy.app.binary_path_python
    else:
        python_binary = sys.executable

    import subprocess
    subprocess.run([python_binary, '-m', 'ensurepip'], check=True)
    subprocess.run([python_binary, '-m', 'pip', 'install', *modules_to_install, "--target", directory], check=True)

    importlib.invalidate_caches()

def register():

    import site

    ensure_site_packages([("crc32c", "crc32c")], directory = site.getusersitepackages())

    import  crc32c

    print(crc32c.crc32c(b'hello world'))
    # 3381945770
    crc = crc32c.crc32c(b'hello')
    print(crc32c.crc32c(b' world', crc))
    # 3381945770


    ensure_site_packages([("google_crc32c", "google-crc32c")], directory = site.getusersitepackages())

    import  google_crc32c

    print(google_crc32c.Checksum(b'hello world')._crc)
    # 3381945770
    checksum = google_crc32c.Checksum(b'hello')
    checksum.update(b' world')
    print(checksum._crc)
    # 3381945770

def unregister():
    pass

if __name__ == "__main__":
    register()

It is not a Blender problem. `site.getusersitepackages()` was even included into `sys.path` by default recently: https://projects.blender.org/blender/blender/commit/72c012ab4a3d2a7f7f59334f4912402338c82e3c It is in 3.5: https://projects.blender.org/blender/blender/blame/commit/1be25cfff18b2c55ad6c0c6389daf3891672476a/source/blender/python/intern/bpy_interface.c#L374-L381 But you still have to check and install libraries. ```py bl_info = { "name": "test crc32c", "author": "", "version": (0, 0, 1), "blender": (2, 80, 0), "location": "", "description": "", "warning": "", "doc_url": "", "category": "Generic", } def ensure_site_packages(packages: list, directory: str): """ `packages`: list of tuples (<import name>, <pip name>) `directory`: a folder for site packages, will be created if does not exist and added to `sys.path` """ if not packages: return import bpy import os import sys import importlib import importlib.util os.makedirs(directory, exist_ok = True) if not directory in sys.path: sys.path.append(directory) modules_to_install = [module[1] for module in packages if not importlib.util.find_spec(module[0])] if not modules_to_install: return if bpy.app.version < (2,91,0): python_binary = bpy.app.binary_path_python else: python_binary = sys.executable import subprocess subprocess.run([python_binary, '-m', 'ensurepip'], check=True) subprocess.run([python_binary, '-m', 'pip', 'install', *modules_to_install, "--target", directory], check=True) importlib.invalidate_caches() def register(): import site ensure_site_packages([("crc32c", "crc32c")], directory = site.getusersitepackages()) import crc32c print(crc32c.crc32c(b'hello world')) # 3381945770 crc = crc32c.crc32c(b'hello') print(crc32c.crc32c(b' world', crc)) # 3381945770 ensure_site_packages([("google_crc32c", "google-crc32c")], directory = site.getusersitepackages()) import google_crc32c print(google_crc32c.Checksum(b'hello world')._crc) # 3381945770 checksum = google_crc32c.Checksum(b'hello') checksum.update(b' world') print(checksum._crc) # 3381945770 def unregister(): pass if __name__ == "__main__": register() ```

Germano Cavalcante commented

2023-04-17 21:00:25 +02:00

Member

Looks like the behavior has changed with 72c012ab4a3d2a7f7f59334f4912402338c82e3c?
Optionally you could manually include directories to be used by the interpreter installed with Blender.
Anyway, this seems to be a configuration issue set for the Python interpreter that comes with Blender and not really a bug.

So I'm closing the report.

Looks like the behavior has changed with 72c012ab4a3d2a7f7f59334f4912402338c82e3c? Optionally you could manually include directories to be used by the interpreter installed with Blender. Anyway, this seems to be a configuration issue set for the Python interpreter that comes with Blender and not really a bug. So I'm closing the report.

Germano Cavalcante closed this issue

2023-04-17 21:00:27 +02:00

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labels 2023-04-17 21:00:38 +02:00

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