ec_iface: Store PyECLibEnum objects in ECDriver

.. also explicitly specify init() arguments

Signed-off-by: Tushar Gohad <tushar.gohad@intel.com>

src/python/pyeclib/core.py

@@ -21,7 +21,6 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-from ec_iface import PyECLib_EC_Types
 from ec_iface import PyECLib_HDRCHKSUM_Types
 import math
 import pyeclib_c
@@ -29,11 +28,8 @@ import sys
 
 pyver = float('%s.%s' % sys.version_info[:2])
 
-#
+
 # Generic ECPyECLibException
-#
-
-
 class ECPyECLibException(Exception):
 
     def __init__(self, error_str):
@@ -45,35 +41,24 @@ class ECPyECLibException(Exception):
 
 class ECPyECLibDriver(object):
 
-    def __init__(self, k, m, ec_type, chksum_type="none"):
+    def __init__(self, k, m, ec_type,
+                 chksum_type=PyECLib_HDRCHKSUM_Types.inline):
         self.k = k
         self.m = m
-
-        if PyECLib_EC_Types.is_member(ec_type):
-            self.ec_type = ec_type
-        else:
-            raise ECPyECLibException("%s is not a valid EC type for PyECLib!" %
-                                     ec_type)
-
-        if PyECLib_HDRCHKSUM_Types.is_member(chksum_type):
-            self.chksum_type = chksum_type
-        else:
-            raise ECPyECLibException(
-                "%s is not a valid checksum type for PyECLib!")
+        self.ec_type = ec_type
+        self.chksum_type = chksum_type
 
         self.inline_chksum = 0
         self.algsig_chksum = 0
-        if self.chksum_type == PyECLib_HDRCHKSUM_Types.inline:
+        if self.chksum_type is PyECLib_HDRCHKSUM_Types.inline:
             self.inline_chksum = 1
-            self.algsig_chksum = 0
-        elif self.chksum_type == PyECLib_HDRCHKSUM_Types.algsig:
-            self.inline_chksum = 0
+        elif self.chksum_type is PyECLib_HDRCHKSUM_Types.algsig:
             self.algsig_chksum = 1
 
         self.handle = pyeclib_c.init(
             self.k,
             self.m,
-            self.ec_type,
+            self.ec_type.name,
             self.inline_chksum,
             self.algsig_chksum)
 
@@ -140,7 +125,7 @@ class ECPyECLibDriver(object):
 
 class ECNullDriver(object):
 
-    def __init__(self, k, m):
+    def __init__(self, k, m, ec_type=None, chksum_type=None):
         self.k = k
         self.m = m
 
@@ -173,7 +158,7 @@ class ECNullDriver(object):
 #
 class ECStripingDriver(object):
 
-    def __init__(self, k, m):
+    def __init__(self, k, m, ec_type=None, chksum_type=None):
         """Stripe an arbitrary-sized string into k fragments
         :param k: the number of data fragments to stripe
         :param m: the number of parity fragments to stripe

src/python/pyeclib/ec_iface.py

@@ -100,6 +100,8 @@ class ECDriver(object):
     def __init__(self, library_import_str, *args, **kwargs):
         self.k = -1
         self.m = -1
+        self.ec_type = None
+        self.chksum_type = None
         self.library_import_str = None
         for (key, value) in kwargs.items():
             if key == "k":
@@ -115,9 +117,19 @@ class ECDriver(object):
                     raise ECDriverError(
                         "Invalid number of data fragments (m)")
             elif key == "ec_type":
-                self.ec_type = value
+                if PyECLib_EC_Types.has_enum(value):
+                    self.ec_type = \
+                        PyECLib_EC_Types.get_by_name(value)
+                else:
+                    raise ECDriverError(
+                        "%s is not a valid EC type for PyECLib!" % value)
             elif key == "chksum_type":
-                self.chksum_type = value
+                if PyECLib_HDRCHKSUM_Types.has_enum(value):
+                    self.chksum_type = \
+                        PyECLib_HDRCHKSUM_Types.get_by_name(value)
+                else:
+                    raise ECDriverError(
+                        "%s is not a valid checksum type for PyECLib!" % value)
 
         if library_import_str is not None:
             self.library_import_str = library_import_str
@@ -126,13 +138,14 @@ class ECDriver(object):
                 "Library import string (library_import_str) was not specified "
                 "and is a required argument!")
         #
-        # We require keyword arguments to prevent ambiguity between EC libs
+        # Instantiate EC backend driver
         #
         self.ec_lib_reference = create_instance(
             library_import_str,
-            *args,
-            **kwargs)
-
+            k=self.k,
+            m=self.m,
+            ec_type=self.ec_type,
+            chksum_type=self.chksum_type)
         #
         # Verify that the imported library implements the required functions
         #