Fix parallel object prepare and run steps. Add nonparallel type marker.

cdist/config.py

@@ -356,10 +356,34 @@ class Config(object):
         elif cargo:
             self.log.trace("Multiprocessing start method is {}".format(
                 multiprocessing.get_start_method()))
+
+            self.log.trace("Multiprocessing cargo: %s", cargo)
+
+            cargo_types = set()
+            for c in cargo:
+                cargo_types.add(c.cdist_type)
+            self.log.trace("Multiprocessing cargo_types: %s", cargo_types)
+            nt = len(cargo_types)
+            if nt == 1:
+                self.log.debug(("Only one type, transfering explorers "
+                                "sequentially"))
+                self.explorer.transfer_type_explorers(cargo_types.pop())
+            else:
+                self.log.trace(("Starting multiprocessing Pool for {} "
+                                "parallel transfering types' explorers".format(
+                                    nt)))
+                args = [
+                    (ct, ) for ct in cargo_types
+                ]
+                mp_pool_run(self.explorer.transfer_type_explorers, args,
+                            jobs=self.jobs)
+                self.log.trace(("Multiprocessing for parallel transfering "
+                                "types' explorers finished"))
+
             self.log.trace(("Starting multiprocessing Pool for {} parallel "
                             "objects preparation".format(n)))
             args = [
-                (c, ) for c in cargo
+                (c, False, ) for c in cargo
             ]
             mp_pool_run(self.object_prepare, args, jobs=self.jobs)
             self.log.trace(("Multiprocessing for parallel object "
@@ -382,20 +406,39 @@ class Config(object):
 
                 # self.object_run(cdist_object)
                 # objects_changed = True
-                cargo.append(cdist_object)
 
-        n = len(cargo)
+                # put objects in chuncks of distinct types
+                # so that there is no more than one object
+                # of the same type in one chunk because there is a
+                # possibility of object's process locking which
+                # prevents parallel execution at remote
+                # and do this only for nonparallel marked types
+                for chunk in cargo:
+                    for obj in chunk:
+                        if (obj.cdist_type == cdist_object.cdist_type and
+                            cdist_object.cdist_type.is_nonparallel):
+                            break
+                    else:
+                        chunk.append(cdist_object)
+                        break
+                else:
+                    chunk = [cdist_object, ]
+                    cargo.append(chunk)
+
+        for chunk in cargo:
+            self.log.trace("Running chunk: %s", chunk)
+            n = len(chunk)
             if n == 1:
                 self.log.debug("Only one object, running sequentially")
-            self.object_run(cargo[0])
+                self.object_run(chunk[0])
                 objects_changed = True
-        elif cargo:
+            elif chunk:
                 self.log.trace("Multiprocessing start method is {}".format(
                     multiprocessing.get_start_method()))
-            self.log.trace(("Starting multiprocessing Pool for {} parallel "
-                            "object run".format(n)))
+                self.log.trace(("Starting multiprocessing Pool for {} "
+                               "parallel object run".format(n)))
                 args = [
-                (c, ) for c in cargo
+                    (c, ) for c in chunk
                 ]
                 mp_pool_run(self.object_run, args, jobs=self.jobs)
                 self.log.trace(("Multiprocessing for parallel object "
@@ -466,12 +509,12 @@ class Config(object):
                     ("The requirements of the following objects could not be "
                      "resolved:\n%s") % ("\n".join(info_string)))
 
-    def object_prepare(self, cdist_object):
+    def object_prepare(self, cdist_object, transfer_type_explorers=True):
         """Prepare object: Run type explorer + manifest"""
         self.log.verbose("Preparing object {}".format(cdist_object.name))
         self.log.verbose(
                 "Running manifest and explorers for " + cdist_object.name)
-        self.explorer.run_type_explorers(cdist_object)
+        self.explorer.run_type_explorers(cdist_object, transfer_type_explorers)
         self.manifest.run_type_manifest(cdist_object)
         cdist_object.state = core.CdistObject.STATE_PREPARED
 

cdist/core/cdist_type.py

@@ -66,6 +66,9 @@ class CdistType(object):
         self.__boolean_parameters = None
         self.__parameter_defaults = None
 
+    def __hash__(self):
+        return hash(self.name)
+
     @classmethod
     def list_types(cls, base_path):
         """Return a list of type instances"""
@@ -112,6 +115,12 @@ class CdistType(object):
           (if not: for configuration)"""
         return os.path.isfile(os.path.join(self.absolute_path, "install"))
 
+    @property
+    def is_nonparallel(self):
+        """Check whether a type is a non parallel, i.e. its objects
+           cannot run in parallel."""
+        return os.path.isfile(os.path.join(self.absolute_path, "nonparallel"))
+
     @property
     def explorers(self):
         """Return a list of available explorers"""

cdist/core/code.py

@@ -141,7 +141,9 @@ class Code(object):
         destination = os.path.join(self.remote.object_path,
                                    cdist_object.code_remote_path)
         # FIXME: BUG: do not create destination, but top level of destination!
-        self.remote.mkdir(destination)
+        # self.remote.mkdir(destination)
+        # FIX?
+        self.remote.mkdir(os.path.dirname(destination))
         self.remote.transfer(source, destination)
 
     def _run_code(self, cdist_object, which, env=None):

cdist/core/explorer.py

@@ -163,16 +163,21 @@ class Explorer(object):
         except EnvironmentError:
             return []
 
-    def run_type_explorers(self, cdist_object):
+    def run_type_explorers(self, cdist_object, transfer_type_explorers=True):
         """Run the type explorers for the given object and save their output
         in the object.
 
         """
         self.log.verbose("Running type explorers for {}".format(
             cdist_object.cdist_type))
+        if transfer_type_explorers:
             self.log.trace("Transfering type explorers for type: %s",
                            cdist_object.cdist_type)
             self.transfer_type_explorers(cdist_object.cdist_type)
+        else:
+            self.log.trace(("No need for transfering type explorers for "
+                            "type: %s"),
+                           cdist_object.cdist_type)
         self.log.trace("Transfering object parameters for object: %s",
                        cdist_object.name)
         self.transfer_object_parameters(cdist_object)

cdist/exec/remote.py

@@ -124,7 +124,7 @@ class Remote(object):
     def transfer(self, source, destination, jobs=None):
         """Transfer a file or directory to the remote side."""
         self.log.trace("Remote transfer: %s -> %s", source, destination)
-        self.rmdir(destination)
+        # self.rmdir(destination)
         if os.path.isdir(source):
             self.mkdir(destination)
             if jobs:

cdist/test/cdist_type/__init__.py

@@ -113,6 +113,16 @@ class TypeTestCase(test.CdistTestCase):
         cdist_type = core.CdistType(base_path, '__not_singleton')
         self.assertFalse(cdist_type.is_singleton)
 
+    def test_nonparallel_is_nonparallel(self):
+        base_path = fixtures
+        cdist_type = core.CdistType(base_path, '__nonparallel')
+        self.assertTrue(cdist_type.is_nonparallel)
+
+    def test_not_nonparallel_is_nonparallel(self):
+        base_path = fixtures
+        cdist_type = core.CdistType(base_path, '__not_nonparallel')
+        self.assertFalse(cdist_type.is_nonparallel)
+
     def test_install_is_install(self):
         base_path = fixtures
         cdist_type = core.CdistType(base_path, '__install')