From 1fc5515d02d83a75e8b9939f89dead2b531bb11c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Billeter?= <j@bitron.ch>
Date: Tue, 10 Sep 2019 08:40:23 +0200
Subject: Add tests/frontend/large_directory.py

---
 tests/frontend/large_directory.py                  | 86 ++++++++++++++++++++++
 .../project/elements/import-large-directory.bst    |  4 +
 2 files changed, 90 insertions(+)
 create mode 100644 tests/frontend/large_directory.py
 create mode 100644 tests/frontend/project/elements/import-large-directory.bst

diff --git a/tests/frontend/large_directory.py b/tests/frontend/large_directory.py
new file mode 100644
index 000000000..921e2ddbe
--- /dev/null
+++ b/tests/frontend/large_directory.py
@@ -0,0 +1,86 @@
+#
+#  Copyright (C) 2019 Bloomberg Finance LP
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public
+#  License as published by the Free Software Foundation; either
+#  version 2 of the License, or (at your option) any later version.
+#
+#  This library is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#  Lesser General Public License for more details.
+#
+#  You should have received a copy of the GNU Lesser General Public
+#  License along with this library. If not, see <http://www.gnu.org/licenses/>.
+#
+
+# Pylint doesn't play well with fixtures and dependency injection from pytest
+# pylint: disable=redefined-outer-name
+
+from contextlib import contextmanager
+import os
+import pytest
+
+import grpc
+
+from buildstream.testing import cli  # pylint: disable=unused-import
+from tests.testutils import create_artifact_share, assert_shared
+
+
+# Project directory
+DATA_DIR = os.path.join(
+    os.path.dirname(os.path.realpath(__file__)),
+    "project",
+)
+
+
+@contextmanager
+def limit_grpc_message_length(limit):
+    orig_insecure_channel = grpc.insecure_channel
+
+    def new_insecure_channel(target):
+        return orig_insecure_channel(target, options=(('grpc.max_send_message_length', limit),))
+
+    grpc.insecure_channel = new_insecure_channel
+    try:
+        yield
+    finally:
+        grpc.insecure_channel = orig_insecure_channel
+
+
+@pytest.mark.datafiles(DATA_DIR)
+def test_large_directory(cli, tmpdir, datafiles):
+    project = str(datafiles)
+
+    # Number of files chosen to ensure the complete list of digests exceeds
+    # our 1 MB gRPC message limit. I.e., test message splitting.
+    MAX_MESSAGE_LENGTH = 1024 * 1024
+    NUM_FILES = MAX_MESSAGE_LENGTH // 64 + 1
+
+    large_directory_dir = os.path.join(project, 'files', 'large-directory')
+    os.mkdir(large_directory_dir)
+    for i in range(NUM_FILES):
+        with open(os.path.join(large_directory_dir, str(i)), 'w') as f:
+            # The files need to have different content as we want different digests.
+            f.write(str(i))
+
+    with create_artifact_share(os.path.join(str(tmpdir), 'artifactshare')) as share:
+        # Configure bst to push to the artifact share
+        cli.configure({
+            'artifacts': [
+                {'url': share.repo, 'push': True},
+            ]
+        })
+
+        # Enforce 1 MB gRPC message limit
+        with limit_grpc_message_length(MAX_MESSAGE_LENGTH):
+            # Build and push
+            result = cli.run(project=project, args=['build', 'import-large-directory.bst'])
+            result.assert_success()
+
+        # Assert that we are now cached locally
+        assert cli.get_element_state(project, 'import-large-directory.bst') == 'cached'
+
+        # Assert that the push was successful
+        assert_shared(cli, share, project, 'import-large-directory.bst')
diff --git a/tests/frontend/project/elements/import-large-directory.bst b/tests/frontend/project/elements/import-large-directory.bst
new file mode 100644
index 000000000..a89a8c16d
--- /dev/null
+++ b/tests/frontend/project/elements/import-large-directory.bst
@@ -0,0 +1,4 @@
+kind: import
+sources:
+- kind: local
+  path: files/large-directory
-- 
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