docs(samples): Adding sample for bucket mounting (#43)

* docs(samples): Adding sample for bucket mounting

* Fixing lint stuff.

compute/batch/requirements-test.txt

@@ -1,2 +1,3 @@
 pytest==7.1.3
 pytest-parallel==0.1.1
+google-cloud-storage==2.5.0

compute/batch/snippets/create/create_with_mounted_bucket.py

@@ -0,0 +1,90 @@
+#  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
+#
+#      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.
+
+# [START batch_create_script_job_with_bucket]
+from google.cloud import batch_v1
+
+
+def create_script_job_with_bucket(project_id: str, region: str, job_name: str, bucket_name: str) -> batch_v1.Job:
+    """
+    This method shows how to create a sample Batch Job that will run
+    a simple command on Cloud Compute instances.
+
+    Args:
+        project_id: project ID or project number of the Cloud project you want to use.
+        region: name of the region you want to use to run the job. Regions that are
+            available for Batch are listed on: https://cloud.google.com/batch/docs/get-started#locations
+        job_name: the name of the job that will be created.
+            It needs to be unique for each project and region pair.
+        bucket_name: name of the bucket to be mounted for your Job.
+
+    Returns:
+        A job object representing the job created.
+    """
+    client = batch_v1.BatchServiceClient()
+
+    # Define what will be done as part of the job.
+    task = batch_v1.TaskSpec()
+    runnable = batch_v1.Runnable()
+    runnable.script = batch_v1.Runnable.Script()
+    runnable.script.text = "echo Hello world from task ${BATCH_TASK_INDEX}. >> /mnt/share/output_task_${BATCH_TASK_INDEX}.txt"
+    task.runnables = [runnable]
+
+    gcs_bucket = batch_v1.GCS()
+    gcs_bucket.remote_path = bucket_name
+    gcs_volume = batch_v1.Volume()
+    gcs_volume.gcs = gcs_bucket
+    gcs_volume.mount_path = '/mnt/share'
+    task.volumes = [gcs_volume]
+
+    # We can specify what resources are requested by each task.
+    resources = batch_v1.ComputeResource()
+    resources.cpu_milli = 500  # in milliseconds per cpu-second. This means the task requires 50% of a single CPUs.
+    resources.memory_mib = 16
+    task.compute_resource = resources
+
+    task.max_retry_count = 2
+    task.max_run_duration = "3600s"
+
+    # Tasks are grouped inside a job using TaskGroups.
+    group = batch_v1.TaskGroup()
+    group.task_count = 4
+    group.task_spec = task
+
+    # Policies are used to define on what kind of virtual machines the tasks will run on.
+    # In this case, we tell the system to use "e2-standard-4" machine type.
+    # Read more about machine types here: https://cloud.google.com/compute/docs/machine-types
+    allocation_policy = batch_v1.AllocationPolicy()
+    policy = batch_v1.AllocationPolicy.InstancePolicy()
+    policy.machine_type = "e2-standard-4"
+    instances = batch_v1.AllocationPolicy.InstancePolicyOrTemplate()
+    instances.policy = policy
+    allocation_policy.instances = [instances]
+
+    job = batch_v1.Job()
+    job.task_groups = [group]
+    job.allocation_policy = allocation_policy
+    job.labels = {"env": "testing", "type": "script", "mount": "bucket"}
+    # We use Cloud Logging as it's an out of the box available option
+    job.logs_policy = batch_v1.LogsPolicy()
+    job.logs_policy.destination = batch_v1.LogsPolicy.Destination.CLOUD_LOGGING
+
+    create_request = batch_v1.CreateJobRequest()
+    create_request.job = job
+    create_request.job_id = job_name
+    # The job's parent is the region in which the job will run
+    create_request.parent = f"projects/{project_id}/locations/{region}"
+
+    return client.create_job(create_request)
+# [END batch_create_script_job_with_bucket]

compute/batch/snippets/tests/test_basics.py

@@ -12,9 +12,9 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 import time
+from typing import Callable
 import uuid
 
-
 import google.auth
 from google.cloud import batch_v1
 import pytest
@@ -44,7 +44,7 @@ def job_name():
     return f"test-job-{uuid.uuid4().hex[:10]}"
 
 
-def _test_body(test_job: batch_v1.Job):
+def _test_body(test_job: batch_v1.Job, additional_test: Callable = None):
     start_time = time.time()
     try:
         while test_job.status.state in WAIT_STATES:
@@ -61,6 +61,9 @@ def _test_body(test_job: batch_v1.Job):
                 break
         else:
             pytest.fail(f"Couldn't find job {test_job.uid} on the list of jobs.")
+
+        if additional_test:
+            additional_test()
     finally:
         delete_job(PROJECT, REGION, test_job.name.rsplit('/', maxsplit=1)[1]).result()
 

compute/batch/snippets/tests/test_bucket.py

@@ -0,0 +1,70 @@
+#  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
+#
+#      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.
+import uuid
+
+
+import google.auth
+from google.cloud import batch_v1
+from google.cloud import storage
+import pytest
+
+from .test_basics import _test_body
+from ..create.create_with_mounted_bucket import create_script_job_with_bucket
+
+PROJECT = google.auth.default()[1]
+REGION = 'europe-north1'
+
+TIMEOUT = 600  # 10 minutes
+
+WAIT_STATES = {
+    batch_v1.JobStatus.State.STATE_UNSPECIFIED,
+    batch_v1.JobStatus.State.QUEUED,
+    batch_v1.JobStatus.State.RUNNING,
+    batch_v1.JobStatus.State.SCHEDULED,
+}
+
+
+@pytest.fixture
+def job_name():
+    return f"test-job-{uuid.uuid4().hex[:10]}"
+
+
+@pytest.fixture()
+def test_bucket():
+    bucket_name = f"test-bucket-{uuid.uuid4().hex[:8]}"
+    client = storage.Client()
+    client.create_bucket(bucket_name, location="eu")
+
+    yield bucket_name
+
+    bucket = client.get_bucket(bucket_name)
+    bucket.delete(force=True)
+
+
+def _test_bucket_content(test_bucket):
+    client = storage.Client()
+    bucket = client.get_bucket(test_bucket)
+
+    file_name_template = "output_task_{task_number}.txt"
+    file_content_template = "Hello world from task {task_number}.\n"
+
+    for i in range(4):
+        blob = bucket.blob(file_name_template.format(task_number=i))
+        content = blob.download_as_bytes().decode()
+        assert content == file_content_template.format(task_number=i)
+
+
+def test_bucket_job(job_name, test_bucket):
+    job = create_script_job_with_bucket(PROJECT, REGION, job_name, test_bucket)
+    _test_body(job, lambda: _test_bucket_content(test_bucket))