[h5py] 40/455: Second try at automatic exceptions

[Ghislain Vaillant]

This is an automated email from the git hooks/post-receive script.

ghisvail-guest pushed a commit to annotated tag 1.3.0
in repository h5py.

commit ed514ccd0be364502a7e29987b7c7f61a53f4908
Author: andrewcollette <andrew.collette at gmail.com>
Date:   Fri Jun 6 04:06:48 2008 +0000

    Second try at automatic exceptions
---
 h5py/h5e.pyx | 118 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)

diff --git a/h5py/h5e.pyx b/h5py/h5e.pyx
new file mode 100644
index 0000000..cf78352
--- /dev/null
+++ b/h5py/h5e.pyx
@@ -0,0 +1,118 @@
+from h5 cimport herr_t, htri_t
+
+
+cdef extern from "Python.h":
+
+  ctypedef extern class __builtin__.BaseException [object PyBaseExceptionObject]:
+    cdef object dict
+    cdef object args
+    cdef object message
+
+
+cdef class H5Error(BaseException):
+    """
+        Base class for all HDF5 exceptions.
+    """
+    pass
+
+
+cdef class ConversionError(H5Error):
+    """
+        Represents a Python-side error performing data conversion between
+        Numpy arrays or dtypes and their HDF5 equivalents.
+    """
+    pass
+
+
+cdef class ErrorStackElement:
+    """
+        Represents an entry in the HDF5 error stack.
+        Loosely modeled on the H5E_error_t struct.
+    """
+    cdef readonly int maj_num
+    cdef readonly int min_num
+    cdef readonly object func_name
+    cdef readonly object file_name
+    cdef readonly unsigned int line
+    cdef readonly object desc
+
+    
+cdef herr_t walk_cb(int n, H5E_error_t *err_desc, stack):
+    # Callback function to extract elements from the HDF5 error stack
+
+    cdef ErrorStackElement element
+
+    element = ErrorStackElement()
+    element.maj_num = err_desc.maj_num
+    element.min_num = err_desc.min_num
+    element.func_name = err_desc.func_name
+    element.file_name = err_desc.file_name
+    element.desc = err_desc.desc
+
+    stack.append(element)
+
+    return 0
+
+cdef class H5LibraryError(H5Error):
+    """
+        Base class for exceptions which include an HDF5 library traceback.
+        Upon instantiation, takes a snapshot of the HDF5 error stack and 
+        stores it internally.
+    """
+    cdef readonly object hdf5_stack
+    
+    def __init__(self, *args):
+        cdef int i
+
+        H5Error.__init__(self)
+        stack = []
+        H5Ewalk(H5E_WALK_DOWNWARD, walk_cb, stack)
+        self.hdf5_stack = stack
+
+        # Stringify the stack
+        if len(stack) == 0:
+            msg = "Unspecified HDF5 error"
+        else:
+            msg = stack[0].desc.capitalize() + "\nHDF5 Error Stack:\n"
+            for i from 0<=i<len(stack):
+                el = stack[i]
+                msg = msg + '    %d: "%s" at %s' % (i, el.desc.capitalize(), el.func_name)
+
+        self.args = (msg,)
+
+cdef extern from "Python.h":
+  void PyErr_SetString(object type_, object msg)
+  void PyErr_SetNone(object type_)
+
+cdef herr_t err_callback(void* client_data):
+    # Callback which does nothing but set a Python exception
+    # Can't use the standard Pyrex raise because then the traceback
+    # points here!
+    PyErr_SetNone(H5LibraryError)
+
+def enable_exceptions():
+    if H5Eset_auto(err_callback, NULL) < 0:
+        raise RuntimeError("Failed to register HDF5 exception callback.")
+
+def disable_exceptions():
+    if H5Eset_auto(NULL, NULL) < 0:
+        raise RuntimeError("Failed to unregister HDF5 exception callback.")
+
+cdef extern from "hdf5.h":
+  htri_t H5Pexist( hid_t id,  char *name) except? -1
+
+def test_error():
+    H5Pexist(-1, "foobar")
+
+
+
+
+
+
+
+
+
+
+
+
+

-- 
Alioth's /usr/local/bin/git-commit-notice on /srv/git.debian.org/git/debian-science/packages/h5py.git