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124 lines
3.5 KiB
Python
124 lines
3.5 KiB
Python
import logging
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import os
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import re
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from ctypes import CDLL, CFUNCTYPE, c_char_p, c_int
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from ctypes.util import find_library
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from django.contrib.gis.gdal.error import GDALException
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from django.core.exceptions import ImproperlyConfigured
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logger = logging.getLogger('django.contrib.gis')
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# Custom library path set?
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try:
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from django.conf import settings
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lib_path = settings.GDAL_LIBRARY_PATH
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except (AttributeError, ImportError, ImproperlyConfigured, OSError):
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lib_path = None
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if lib_path:
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lib_names = None
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elif os.name == 'nt':
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# Windows NT shared libraries
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lib_names = ['gdal204', 'gdal203', 'gdal202', 'gdal201', 'gdal20']
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elif os.name == 'posix':
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# *NIX library names.
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lib_names = ['gdal', 'GDAL', 'gdal2.4.0', 'gdal2.3.0', 'gdal2.2.0', 'gdal2.1.0', 'gdal2.0.0']
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else:
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raise ImproperlyConfigured('GDAL is unsupported on OS "%s".' % os.name)
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# Using the ctypes `find_library` utility to find the
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# path to the GDAL library from the list of library names.
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if lib_names:
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for lib_name in lib_names:
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lib_path = find_library(lib_name)
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if lib_path is not None:
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break
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if lib_path is None:
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raise ImproperlyConfigured(
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'Could not find the GDAL library (tried "%s"). Is GDAL installed? '
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'If it is, try setting GDAL_LIBRARY_PATH in your settings.'
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% '", "'.join(lib_names)
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)
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# This loads the GDAL/OGR C library
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lgdal = CDLL(lib_path)
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# On Windows, the GDAL binaries have some OSR routines exported with
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# STDCALL, while others are not. Thus, the library will also need to
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# be loaded up as WinDLL for said OSR functions that require the
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# different calling convention.
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if os.name == 'nt':
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from ctypes import WinDLL
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lwingdal = WinDLL(lib_path)
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def std_call(func):
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"""
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Return the correct STDCALL function for certain OSR routines on Win32
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platforms.
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"""
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if os.name == 'nt':
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return lwingdal[func]
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else:
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return lgdal[func]
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# #### Version-information functions. ####
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# Return GDAL library version information with the given key.
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_version_info = std_call('GDALVersionInfo')
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_version_info.argtypes = [c_char_p]
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_version_info.restype = c_char_p
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def gdal_version():
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"Return only the GDAL version number information."
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return _version_info(b'RELEASE_NAME')
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def gdal_full_version():
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"Return the full GDAL version information."
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return _version_info('')
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version_regex = re.compile(r'^(?P<major>\d+)\.(?P<minor>\d+)(\.(?P<subminor>\d+))?')
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def gdal_version_info():
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ver = gdal_version().decode()
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m = version_regex.match(ver)
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if not m:
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raise GDALException('Could not parse GDAL version string "%s"' % ver)
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return {key: m.group(key) for key in ('major', 'minor', 'subminor')}
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_verinfo = gdal_version_info()
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GDAL_MAJOR_VERSION = int(_verinfo['major'])
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GDAL_MINOR_VERSION = int(_verinfo['minor'])
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GDAL_SUBMINOR_VERSION = _verinfo['subminor'] and int(_verinfo['subminor'])
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GDAL_VERSION = (GDAL_MAJOR_VERSION, GDAL_MINOR_VERSION, GDAL_SUBMINOR_VERSION)
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del _verinfo
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# Set library error handling so as errors are logged
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CPLErrorHandler = CFUNCTYPE(None, c_int, c_int, c_char_p)
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def err_handler(error_class, error_number, message):
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logger.error('GDAL_ERROR %d: %s', error_number, message)
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err_handler = CPLErrorHandler(err_handler)
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def function(name, args, restype):
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func = std_call(name)
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func.argtypes = args
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func.restype = restype
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return func
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set_error_handler = function('CPLSetErrorHandler', [CPLErrorHandler], CPLErrorHandler)
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set_error_handler(err_handler)
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