Logging API usage docs.

Squashed after review on PR #1488.

docs/index.rst

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   search-index
   search-document
 
+.. toctree::
+  :maxdepth: 0
+  :hidden:
+  :caption: Cloud Logging
+
+  logging-usage
+
 .. toctree::
   :maxdepth: 0
   :hidden:

docs/logging-usage.rst

@@ -0,0 +1,307 @@
+Using the API
+=============
+
+
+Authentication and Configuration
+--------------------------------
+
+- For an overview of authentication in ``gcloud-python``,
+  see :doc:`gcloud-auth`.
+
+- In addition to any authentication configuration, you should also set the
+  :envvar:`GCLOUD_PROJECT` environment variable for the project you'd like
+  to interact with. If you are Google App Engine or Google Compute Engine
+  this will be detected automatically.
+
+- After configuring your environment, create a
+  :class:`Client <gcloud.logging.client.Client>`
+
+  .. doctest::
+
+     >>> from gcloud import logging
+     >>> client = logging.Client()
+
+  or pass in ``credentials`` and ``project`` explicitly
+
+  .. doctest::
+
+     >>> from gcloud import logging
+     >>> client = logging.Client(project='my-project', credentials=creds)
+
+
+Writing log entries
+-------------------
+
+Write a simple text entry to a logger.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> logger = client.logger('log_name')
+   >>> logger.log_text("A simple entry")  # API call
+
+Write a dictionary entry to a logger.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> logger = client.logger('log_name')
+   >>> logger.log_struct(
+   ...     message="My second entry",
+   ...     weather="partly cloudy")  # API call
+
+
+Retrieving log entries
+----------------------
+
+Fetch entries for the default project.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> entries, token = client.list_entries()  # API call
+   >>> for entry in entries:
+   ...    timestamp = entry.timestamp.isoformat()
+   ...    print('%sZ: %s | %s' %
+   ...          (timestamp, entry.text_payload, entry.struct_payload))
+   2016-02-17T20:35:49.031864072Z: A simple entry | None
+   2016-02-17T20:38:15.944418531Z: None | {'message': 'My second entry', 'weather': 'partly cloudy'}
+
+Fetch entries across multiple projects.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> entries, token = client.list_entries(
+   ...     project_ids=['one-project', 'another-project'])  # API call
+
+Filter entries retrieved using the `Advanced Logs Filters`_ syntax
+
+.. _Advanced Logs Filters: https://cloud.google.com/logging/docs/view/advanced_filters
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> FILTER = "log:log_name AND textPayload:simple"
+   >>> entries, token = client.list_entries(filter=FILTER)  # API call
+
+Sort entries in descending timestamp order.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> entries, token = client.list_entries(order_by=logging.DESCENDING)  # API call
+
+Retrieve entities in batches of 10, iterating until done.
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> retrieved = []
+   >>> token = None
+   >>> while True:
+   ...     entries, token = client.list_entries(page_size=10, page_token=token)  # API call
+   ...     retrieved.extend(entries)
+   ...     if token is None:
+   ...         break
+
+
+Delete all entries for a logger
+-------------------------------
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> logger = client.logger('log_name')
+   >>> logger.delete_entries()  # API call
+
+
+Manage log metrics
+------------------
+
+Metrics are counters of entries which match a given filter.  They can be
+used within Cloud Monitoring to create charts and alerts.
+
+Create a metric:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> metric = client.metric(
+   ...     "robots", "Robots all up in your server",
+   ...     filter='log:apache-access AND textPayload:robot')
+   >>> metric.exists()  # API call
+   False
+   >>> metric.create()  # API call
+   >>> metric.exists()  # API call
+   True
+
+List all metrics for a project:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> metrics, token = client.list_metrics()
+   >>> len(metrics)
+   1
+   >>> metric = metrics[0]
+   >>> metric.name
+   "robots"
+
+Refresh local information about a metric:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> metric = client.metric("robots")
+   >>> metric.reload()  # API call
+   >>> metric.description
+   "Robots all up in your server"
+   >>> metric.filter
+   "log:apache-access AND textPayload:robot"
+
+Update a metric:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> metric = client.metric("robots")
+   >>> metric.exists()  # API call
+   True
+   >>> metric.reload()  # API call
+   >>> metric.description = "Danger, Will Robinson!"
+   >>> metric.update()  # API call
+
+Delete a metric:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> metric = client.metric("robots")
+   >>> metric.exists()  # API call
+   True
+   >>> metric.delete()  # API call
+   >>> metric.exists()  # API call
+   False
+
+
+Export log entries using sinks
+------------------------------
+
+Sinks allow exporting entries which match a given filter to Cloud Storage
+buckets, BigQuery datasets, or Cloud Pub/Sub topics.
+
+Create a Cloud Storage sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink(
+   ...     "robots-storage",
+   ...     filter='log:apache-access AND textPayload:robot')
+   >>> sink.storage_bucket = "my-bucket-name"
+   >>> sink.exists()  # API call
+   False
+   >>> sink.create()  # API call
+   >>> sink.exists()  # API call
+   True
+
+Create a BigQuery sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink(
+   ...     "robots-bq",
+   ...     filter='log:apache-access AND textPayload:robot')
+   >>> sink.bigquery_dataset = "projects/my-project/datasets/my-dataset"
+   >>> sink.exists()  # API call
+   False
+   >>> sink.create()  # API call
+   >>> sink.exists()  # API call
+   True
+
+Create a Cloud Pub/Sub sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink(
+   ...     "robots-pubsub",
+   ...     filter='log:apache-access AND textPayload:robot')
+   >>> sink.pubsub_topic = 'projects/my-project/topics/my-topic'
+   >>> sink.exists()  # API call
+   False
+   >>> sink.create()  # API call
+   >>> sink.exists()  # API call
+   True
+
+List all sinks for a project:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sinks, token = client.list_sinks()
+   >>> for sink in sinks:
+   ...     print('%s: %s' % (sink.name, sink.destination))
+   robots-storage: storage.googleapis.com/my-bucket-name
+   robots-bq: bigquery.googleapis.com/projects/my-project/datasets/my-dataset
+   robots-pubsub: pubsub.googleapis.com/projects/my-project/topics/my-topic
+
+Refresh local information about a sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink('robots-storage')
+   >>> sink.filter is None
+   True
+   >>> sink.reload()  # API call
+   >>> sink.filter
+   'log:apache-access AND textPayload:robot'
+   >>> sink.destination
+   'storage.googleapis.com/my-bucket-name'
+
+Update a sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink("robots")
+   >>> sink.reload()  # API call
+   >>> sink.filter = "log:apache-access"
+   >>> sink.update()  # API call
+
+Delete a sink:
+
+.. doctest::
+
+   >>> from gcloud import logging
+   >>> client = logging.Client()
+   >>> sink = client.sink(
+   ...     "robots",
+   ...     filter='log:apache-access AND textPayload:robot')
+   >>> sink.exists()  # API call
+   True
+   >>> sink.delete()  # API call
+   >>> sink.exists()  # API call
+   False