Move some of the logic in get_prefixed_version to a ModuleBuild static method

The logic used to parse the stream version will need to be reused elsewhere
to support the filtering and ordering of a base module stream version.

module_build_service/models.py

@@ -620,6 +620,42 @@ class ModuleBuild(MBSBase):
         return ModuleBuildTrace.query.filter_by(
             module_id=module_id).order_by(ModuleBuildTrace.state_time).all()
 
+    @staticmethod
+    def get_stream_version(stream):
+        """
+        Parse the supplied stream to find its version.
+
+        This will parse a stream such as "f27" and return 270000. Another example would be a stream
+        of "f27.0.1" and return 270001.
+        :param str stream: the module stream
+        :return: a stream version represented as an integer
+        :rtype: int or None if the stream doesn't have a valid version
+        """
+        # The platform version (e.g. prefix1.2.0 => 010200)
+        version = ''
+        for char in stream:
+            # See if the current character is an integer, signifying the version has started
+            if char.isdigit():
+                version += char
+            # If version isn't set, then a digit hasn't been encountered
+            elif version:
+                # If the character is a period and the version is set, then
+                # the loop is still processing the version part of the stream
+                if char == '.':
+                    version += '.'
+                # If the version is set and the character is not a period or
+                # digit, then the remainder of the stream is a suffix like "-beta"
+                else:
+                    break
+
+        # Remove the periods and pad the numbers if necessary
+        version = ''.join([section.zfill(2) for section in version.split('.')])
+
+        if version:
+            # Since the version must be stored as a number, we convert the string back to
+            # an integer which consequently drops the leading zero if there is one
+            return int(version)
+
     def __repr__(self):
         return (("<ModuleBuild %s, id=%d, stream=%s, version=%s, state %r,"
                  " batch %r, state_reason %r>")

module_build_service/utils/submit.py

@@ -239,36 +239,14 @@ def get_prefixed_version(mmd):
             return version
 
         # The platform version (e.g. prefix1.2.0 => 010200)
-        version_prefix = ''
-        for char in base_module_stream:
-            try:
-                # See if the current character is an integer, signifying the version
-                # has started
-                int(char)
-                version_prefix += char
-            except ValueError:
-                # If version_prefix isn't set, then a digit hasn't been encountered
-                if version_prefix:
-                    # If the character is a period and the version_prefix is set, then
-                    # the loop is still processing the version part of the stream
-                    if char == '.':
-                        version_prefix += '.'
-                    # If the version_prefix is set and the character is not a period or
-                    # digit, then the remainder of the stream is a suffix like "-beta"
-                    else:
-                        break
-
-        # Remove the periods and pad the numbers if necessary
-        version_prefix = ''.join([section.zfill(2) for section in version_prefix.split('.')])
+        version_prefix = models.ModuleBuild.get_stream_version(base_module_stream)
 
         if not version_prefix:
             log.warning('The "{0}" stream "{1}" couldn\'t be used to prefix the module\'s '
                         'version'.format(base_module, base_module_stream))
             return version
 
-        # Since the version must be stored as a number, we convert the string back to
-        # an integer which consequently drops the leading zero if there is one
-        new_version = int(version_prefix + str(version))
+        new_version = int(str(version_prefix) + str(version))
         if new_version > GLib.MAXUINT64:
             log.warning('The "{0}" stream "{1}" caused the module\'s version prefix to be '
                         'too long'.format(base_module, base_module_stream))

tests/test_models/test_models.py

@@ -93,6 +93,11 @@ class TestModels:
         build_one = ModuleBuild.query.get(2)
         assert build_one.siblings == [3, 4]
 
+    def test_get_stream_version(self):
+        """Test the ModuleBuild.get_stream_version method when right_pad is True."""
+        assert ModuleBuild.get_stream_version('f27') == 270000
+        assert ModuleBuild.get_stream_version('f27.02.30') == 270230
+
 
 class TestModelsGetStreamsContexts: