docs(samples): add create_migration_workflow snippet (#71)

* docs(samples): add handwritten snippet structure

* docs(samples): add create_migration_workflow snippet

* fix copyright

* remove types

* lint

* cleanup noxfile

* enforce type hints

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* Update samples/snippets/create_migration_workflow.py

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

* Update samples/snippets/create_migration_workflow.py

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

* pin dependencies

* add type annotations

Co-authored-by: Anthonios Partheniou <partheniou@google.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

bigquery-migration/snippets/__init__.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.

bigquery-migration/snippets/create_migration_workflow.py

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START bigquery_migration_create_workflow]
+def create_migration_workflow(
+    gcs_input_path: str, gcs_output_path: str, project_id: str
+) -> None:
+    """Creates a migration workflow of a Batch SQL Translation and prints the response."""
+
+    from google.cloud import bigquery_migration_v2
+
+    parent = f"projects/{project_id}/locations/us"
+
+    # Construct a BigQuery Migration client object.
+    client = bigquery_migration_v2.MigrationServiceClient()
+
+    # Set the source dialect to Teradata SQL.
+    source_dialect = bigquery_migration_v2.Dialect()
+    source_dialect.teradata_dialect = bigquery_migration_v2.TeradataDialect(
+        mode=bigquery_migration_v2.TeradataDialect.Mode.SQL
+    )
+
+    # Set the target dialect to BigQuery dialect.
+    target_dialect = bigquery_migration_v2.Dialect()
+    target_dialect.bigquery_dialect = bigquery_migration_v2.BigQueryDialect()
+
+    # Prepare the config proto.
+    translation_config = bigquery_migration_v2.TranslationConfigDetails(
+        gcs_source_path=gcs_input_path,
+        gcs_target_path=gcs_output_path,
+        source_dialect=source_dialect,
+        target_dialect=target_dialect,
+    )
+
+    # Prepare the task.
+    migration_task = bigquery_migration_v2.MigrationTask(
+        type_="Translation_Teradata2BQ", translation_config_details=translation_config
+    )
+
+    # Prepare the workflow.
+    workflow = bigquery_migration_v2.MigrationWorkflow(
+        display_name="demo-workflow-python-example-Teradata2BQ"
+    )
+
+    workflow.tasks["translation-task"] = migration_task  # type: ignore
+
+    # Prepare the API request to create a migration workflow.
+    request = bigquery_migration_v2.CreateMigrationWorkflowRequest(
+        parent=parent,
+        migration_workflow=workflow,
+    )
+
+    response = client.create_migration_workflow(request=request)
+
+    print("Created workflow:")
+    print(response.display_name)
+    print("Current state:")
+    print(response.State(response.state))
+
+
+# [END bigquery_migration_create_workflow]

bigquery-migration/snippets/create_migration_workflow_test.py

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+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+from typing import Iterable, List, Optional
+
+from google.api_core.exceptions import (
+    InternalServerError,
+    ServiceUnavailable,
+    TooManyRequests,
+)
+
+from google.cloud import storage
+
+import pytest
+
+from test_utils.retry import RetryErrors
+from test_utils.system import unique_resource_id
+
+from . import create_migration_workflow
+
+retry_storage_errors = RetryErrors(
+    (TooManyRequests, InternalServerError, ServiceUnavailable)
+)
+
+storage_client = storage.Client()
+PROJECT_ID = storage_client.project
+
+
+def _create_bucket(bucket_name: str, location: Optional[str] = None) -> storage.Bucket:
+    bucket = storage_client.bucket(bucket_name)
+    retry_storage_errors(storage_client.create_bucket)(bucket_name, location=location)
+
+    return bucket
+
+
+@pytest.fixture
+def buckets_to_delete() -> Iterable[List]:
+    doomed = []
+    yield doomed
+    for item in doomed:
+        if isinstance(item, storage.Bucket):
+            retry_storage_errors(item.delete)(force=True)
+
+
+def test_create_migration_workflow(
+    capsys: pytest.CaptureFixture, buckets_to_delete: List[storage.Bucket]
+) -> None:
+    bucket_name = "bq_migration_create_workflow_test" + unique_resource_id()
+    path = f"gs://{PROJECT_ID}/{bucket_name}"
+    bucket = _create_bucket(bucket_name)
+    buckets_to_delete.extend([bucket])
+
+    create_migration_workflow.create_migration_workflow(path, path, PROJECT_ID)
+    out, _ = capsys.readouterr()
+
+    assert "demo-workflow-python-example-Teradata2BQ" in out
+    assert "Current state:" in out

bigquery-migration/snippets/noxfile_config.py

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+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Default TEST_CONFIG_OVERRIDE for python repos.
+
+# You can copy this file into your directory, then it will be inported from
+# the noxfile.py.
+
+# The source of truth:
+# https://github.com/GoogleCloudPlatform/python-docs-samples/blob/main/noxfile_config.py
+
+TEST_CONFIG_OVERRIDE = {
+    # You can opt out from the test for specific Python versions.
+    "ignored_versions": [],
+    # Old samples are opted out of enforcing Python type hints
+    # All new samples should feature them
+    "enforce_type_hints": True,
+    # An envvar key for determining the project id to use. Change it
+    # to 'BUILD_SPECIFIC_GCLOUD_PROJECT' if you want to opt in using a
+    # build specific Cloud project. You can also use your own string
+    # to use your own Cloud project.
+    # "gcloud_project_env": "GOOGLE_CLOUD_PROJECT",
+    "gcloud_project_env": "GOOGLE_CLOUD_PROJECT",
+    # A dictionary you want to inject into your test. Don't put any
+    # secrets here. These values will override predefined values.
+    "envs": {},
+}

bigquery-migration/snippets/requirements-test.txt

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+pytest==6.2.5
+google-cloud-testutils==1.3.0
+google-api-core==2.8.0
+google-cloud-storage==2.0.0

bigquery-migration/snippets/requirements.txt

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+google-cloud-bigquery-migration==0.4.1
+protobuf==3.19.1