From 5681942aabf65daa31c5e591f0d1d99e0d2bc70f Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Tue, 1 Jan 2013 20:48:05 -0800
Subject: [PATCH] depgraph: dynamic deps parallel metadata regen

---
 pym/_emerge/FakeVartree.py |  7 +++++
 pym/_emerge/depgraph.py    | 60 +++++++++++++++++++++++++++++++++-----
 2 files changed, 59 insertions(+), 8 deletions(-)

diff --git a/pym/_emerge/FakeVartree.py b/pym/_emerge/FakeVartree.py
index 31ff65c2b..058c1c70f 100644
--- a/pym/_emerge/FakeVartree.py
+++ b/pym/_emerge/FakeVartree.py
@@ -167,6 +167,13 @@ class FakeVartree(vartree):
 			perform_global_updates(
 				pkg.cpv, self.dbapi, self._global_updates)
 
+	def dynamic_deps_preload(self, pkg, metadata):
+		if metadata is not None:
+			metadata = dict((k, metadata.get(k, ''))
+				for k in self._portdb_keys)
+		self._apply_dynamic_deps(pkg, metadata)
+		self._aux_get_history.add(pkg.cpv)
+
 	def cpv_discard(self, pkg):
 		"""
 		Discard a package from the fake vardb if it exists.
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index fab87d946..47f1b6002 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -41,6 +41,7 @@ from portage.util import ensure_dirs
 from portage.util import writemsg_level, write_atomic
 from portage.util.digraph import digraph
 from portage.util.listdir import _ignorecvs_dirs
+from portage.util._async.TaskScheduler import TaskScheduler
 from portage.versions import catpkgsplit
 
 from _emerge.AtomArg import AtomArg
@@ -54,6 +55,7 @@ from _emerge.DependencyArg import DependencyArg
 from _emerge.DepPriority import DepPriority
 from _emerge.DepPriorityNormalRange import DepPriorityNormalRange
 from _emerge.DepPrioritySatisfiedRange import DepPrioritySatisfiedRange
+from _emerge.EbuildMetadataPhase import EbuildMetadataPhase
 from _emerge.FakeVartree import FakeVartree
 from _emerge._find_deep_system_runtime_deps import _find_deep_system_runtime_deps
 from _emerge.is_valid_package_atom import insert_category_into_atom, \
@@ -551,17 +553,59 @@ class depgraph(object):
 				fakedb = self._dynamic_config._graph_trees[
 					myroot]["vartree"].dbapi
 
-				for pkg in vardb:
-					self._spinner_update()
-					if dynamic_deps:
-						# This causes FakeVartree to update the
-						# Package instance dependencies via
-						# PackageVirtualDbapi.aux_update()
-						vardb.aux_get(pkg.cpv, [])
-					fakedb.cpv_inject(pkg)
+				if not dynamic_deps:
+					for pkg in vardb:
+						fakedb.cpv_inject(pkg)
+				else:
+					max_jobs = self._frozen_config.myopts.get("--jobs")
+					max_load = self._frozen_config.myopts.get("--load-average")
+					scheduler = TaskScheduler(
+						self._dynamic_deps_preload(fake_vartree, fakedb),
+						max_jobs=max_jobs,
+						max_load=max_load,
+						event_loop=fake_vartree._portdb._event_loop)
+					scheduler.start()
+					scheduler.wait()
 
 		self._dynamic_config._vdb_loaded = True
 
+	def _dynamic_deps_preload(self, fake_vartree, fakedb):
+		portdb = fake_vartree._portdb
+		for pkg in fake_vartree.dbapi:
+			self._spinner_update()
+			fakedb.cpv_inject(pkg)
+			ebuild_path, repo_path = \
+				portdb.findname2(pkg.cpv, myrepo=pkg.repo)
+			if ebuild_path is None:
+				fake_vartree.dynamic_deps_preload(pkg, None)
+				continue
+			metadata, ebuild_hash = portdb._pull_valid_cache(
+				pkg.cpv, ebuild_path, repo_path)
+			if metadata is not None:
+				fake_vartree.dynamic_deps_preload(pkg, metadata)
+			else:
+				proc =  EbuildMetadataPhase(cpv=pkg.cpv,
+					ebuild_hash=ebuild_hash,
+					portdb=portdb, repo_path=repo_path,
+					settings=portdb.doebuild_settings)
+				proc.addExitListener(
+					self._dynamic_deps_proc_exit(pkg, fake_vartree))
+				yield proc
+
+	class _dynamic_deps_proc_exit(object):
+
+		__slots__ = ('_pkg', '_fake_vartree')
+
+		def __init__(self, pkg, fake_vartree):
+			self._pkg = pkg
+			self._fake_vartree = fake_vartree
+
+		def __call__(self, proc):
+			metadata = None
+			if proc.returncode == os.EX_OK:
+				metadata = proc.metadata
+			self._fake_vartree.dynamic_deps_preload(self._pkg, metadata)
+
 	def _spinner_update(self):
 		if self._frozen_config.spinner:
 			self._frozen_config.spinner.update()
-- 
2.26.2