restic/vendor/cloud.google.com/go/README.md

# Google Cloud Client Libraries for Go

[![GoDoc](https://godoc.org/cloud.google.com/go?status.svg)](https://godoc.org/cloud.google.com/go)

Go packages for [Google Cloud Platform](https://cloud.google.com) services.

``` go
import "cloud.google.com/go"
```

To install the packages on your system,

```
$ go get -u cloud.google.com/go/...
```

**NOTE:** Some of these packages are under development, and may occasionally
make backwards-incompatible changes.

**NOTE:** Github repo is a mirror of [https://code.googlesource.com/gocloud](https://code.googlesource.com/gocloud).

  * [News](#news)
  * [Supported APIs](#supported-apis)
  * [Go Versions Supported](#go-versions-supported)
  * [Authorization](#authorization)
  * [Cloud Datastore](#cloud-datastore-)
  * [Cloud Storage](#cloud-storage-)
  * [Cloud Pub/Sub](#cloud-pub-sub-)
  * [Cloud BigQuery](#cloud-bigquery-)
  * [Stackdriver Logging](#stackdriver-logging-)
  * [Cloud Spanner](#cloud-spanner-)


## News

_September 28, 2017_

*v0.14.0*

- bigquery BREAKING CHANGES:
  - Standard SQL is the default for queries and views.
  - `Table.Create` takes `TableMetadata` as a second argument, instead of
    options.
  - `Dataset.Create` takes `DatasetMetadata` as a second argument.
  - `DatasetMetadata` field `ID` renamed to `FullID`
  - `TableMetadata` field `ID` renamed to `FullID`

- Other bigquery changes:
  - The client will append a random suffix to a provided job ID if you set
    `AddJobIDSuffix` to true in a job config.
  - Listing jobs is supported.
  - Better retry logic.

- vision, language, speech: clients are now stable

- monitoring: client is now beta

- profiler:
  - Rename InstanceName to Instance, ZoneName to Zone
  - Auto-detect service name and version on AppEngine.

_September 8, 2017_

*v0.13.0*

- bigquery: UseLegacySQL options for CreateTable and QueryConfig. Use these
  options to continue using Legacy SQL after the client switches its default
  to Standard SQL.

- bigquery: Support for updating dataset labels.

- bigquery: Set DatasetIterator.ProjectID to list datasets in a project other
  than the client's. DatasetsInProject is no longer needed and is deprecated.

- bigtable: Fail ListInstances when any zones fail.

- spanner: support decoding of slices of basic types (e.g. []string, []int64,
  etc.)

- logging/logadmin: UpdateSink no longer creates a sink if it is missing
  (actually a change to the underlying service, not the client)

- profiler: Service and ServiceVersion replace Target in Config.

_August 22, 2017_

*v0.12.0*

- pubsub: Subscription.Receive now uses streaming pull.

- pubsub: add Client.TopicInProject to access topics in a different project
  than the client.

- errors: renamed errorreporting. The errors package will be removed shortly.

- datastore: improved retry behavior.

- bigquery: support updates to dataset metadata, with etags.

- bigquery: add etag support to Table.Update (BREAKING: etag argument added).

- bigquery: generate all job IDs on the client.

- storage: support bucket lifecycle configurations.


_July 31, 2017_

*v0.11.0*

- Clients for spanner, pubsub and video are now in beta.

- New client for DLP.

- spanner: performance and testing improvements.

- storage: requester-pays buckets are supported.

- storage, profiler, bigtable, bigquery: bug fixes and other minor improvements.

- pubsub: bug fixes and other minor improvements

_June 17, 2017_


*v0.10.0*

- pubsub: Subscription.ModifyPushConfig replaced with Subscription.Update.

- pubsub: Subscription.Receive now runs concurrently for higher throughput.

- vision: cloud.google.com/go/vision is deprecated. Use
cloud.google.com/go/vision/apiv1 instead.

- translation: now stable.

- trace: several changes to the surface. See the link below.

[Code changes required from v0.9.0.](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/MIGRATION.md)


[Older news](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/old-news.md)

## Supported APIs

Google API                       | Status       | Package
---------------------------------|--------------|-----------------------------------------------------------
[Datastore][cloud-datastore]     | stable       | [`cloud.google.com/go/datastore`][cloud-datastore-ref]
[Storage][cloud-storage]         | stable       | [`cloud.google.com/go/storage`][cloud-storage-ref]
[Bigtable][cloud-bigtable]       | beta         | [`cloud.google.com/go/bigtable`][cloud-bigtable-ref]
[BigQuery][cloud-bigquery]       | beta         | [`cloud.google.com/go/bigquery`][cloud-bigquery-ref]
[Logging][cloud-logging]         | stable       | [`cloud.google.com/go/logging`][cloud-logging-ref]
[Monitoring][cloud-monitoring]   | beta         | [`cloud.google.com/go/monitoring/apiv3`][cloud-monitoring-ref]
[Pub/Sub][cloud-pubsub]          | beta         | [`cloud.google.com/go/pubsub`][cloud-pubsub-ref]
[Vision][cloud-vision]           | stable       | [`cloud.google.com/go/vision/apiv1`][cloud-vision-ref]
[Language][cloud-language]       | stable       | [`cloud.google.com/go/language/apiv1`][cloud-language-ref]
[Speech][cloud-speech]           | stable       | [`cloud.google.com/go/speech/apiv1`][cloud-speech-ref]
[Spanner][cloud-spanner]         | beta         | [`cloud.google.com/go/spanner`][cloud-spanner-ref]
[Translation][cloud-translation] | stable       | [`cloud.google.com/go/translate`][cloud-translation-ref]
[Trace][cloud-trace]             | alpha        | [`cloud.google.com/go/trace`][cloud-trace-ref]
[Video Intelligence][cloud-video]| beta         | [`cloud.google.com/go/videointelligence/apiv1beta1`][cloud-video-ref]
[ErrorReporting][cloud-errors]   | alpha        | [`cloud.google.com/go/errorreporting`][cloud-errors-ref]


> **Alpha status**: the API is still being actively developed. As a
> result, it might change in backward-incompatible ways and is not recommended
> for production use.
>
> **Beta status**: the API is largely complete, but still has outstanding
> features and bugs to be addressed. There may be minor backwards-incompatible
> changes where necessary.
>
> **Stable status**: the API is mature and ready for production use. We will
> continue addressing bugs and feature requests.

Documentation and examples are available at
https://godoc.org/cloud.google.com/go

Visit or join the
[google-api-go-announce group](https://groups.google.com/forum/#!forum/google-api-go-announce)
for updates on these packages.

## Go Versions Supported

We support the two most recent major versions of Go. If Google App Engine uses
an older version, we support that as well. You can see which versions are
currently supported by looking at the lines following `go:` in
[`.travis.yml`](.travis.yml).

## Authorization

By default, each API will use [Google Application Default Credentials][default-creds]
for authorization credentials used in calling the API endpoints. This will allow your
application to run in many environments without requiring explicit configuration.

[snip]:# (auth)
```go
client, err := storage.NewClient(ctx)
```

To authorize using a
[JSON key file](https://cloud.google.com/iam/docs/managing-service-account-keys),
pass
[`option.WithServiceAccountFile`](https://godoc.org/google.golang.org/api/option#WithServiceAccountFile)
to the `NewClient` function of the desired package. For example:

[snip]:# (auth-JSON)
```go
client, err := storage.NewClient(ctx, option.WithServiceAccountFile("path/to/keyfile.json"))
```

You can exert more control over authorization by using the
[`golang.org/x/oauth2`](https://godoc.org/golang.org/x/oauth2) package to
create an `oauth2.TokenSource`. Then pass
[`option.WithTokenSource`](https://godoc.org/google.golang.org/api/option#WithTokenSource)
to the `NewClient` function:
[snip]:# (auth-ts)
```go
tokenSource := ...
client, err := storage.NewClient(ctx, option.WithTokenSource(tokenSource))
```

## Cloud Datastore [![GoDoc](https://godoc.org/cloud.google.com/go/datastore?status.svg)](https://godoc.org/cloud.google.com/go/datastore)

- [About Cloud Datastore][cloud-datastore]
- [Activating the API for your project][cloud-datastore-activation]
- [API documentation][cloud-datastore-docs]
- [Go client documentation](https://godoc.org/cloud.google.com/go/datastore)
- [Complete sample program](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/datastore/tasks)

### Example Usage

First create a `datastore.Client` to use throughout your application:

[snip]:# (datastore-1)
```go
client, err := datastore.NewClient(ctx, "my-project-id")
if err != nil {
	log.Fatal(err)
}
```

Then use that client to interact with the API:

[snip]:# (datastore-2)
```go
type Post struct {
	Title       string
	Body        string `datastore:",noindex"`
	PublishedAt time.Time
}
keys := []*datastore.Key{
	datastore.NameKey("Post", "post1", nil),
	datastore.NameKey("Post", "post2", nil),
}
posts := []*Post{
	{Title: "Post 1", Body: "...", PublishedAt: time.Now()},
	{Title: "Post 2", Body: "...", PublishedAt: time.Now()},
}
if _, err := client.PutMulti(ctx, keys, posts); err != nil {
	log.Fatal(err)
}
```

## Cloud Storage [![GoDoc](https://godoc.org/cloud.google.com/go/storage?status.svg)](https://godoc.org/cloud.google.com/go/storage)

- [About Cloud Storage][cloud-storage]
- [API documentation][cloud-storage-docs]
- [Go client documentation](https://godoc.org/cloud.google.com/go/storage)
- [Complete sample programs](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/storage)

### Example Usage

First create a `storage.Client` to use throughout your application:

[snip]:# (storage-1)
```go
client, err := storage.NewClient(ctx)
if err != nil {
	log.Fatal(err)
}
```

[snip]:# (storage-2)
```go
// Read the object1 from bucket.
rc, err := client.Bucket("bucket").Object("object1").NewReader(ctx)
if err != nil {
	log.Fatal(err)
}
defer rc.Close()
body, err := ioutil.ReadAll(rc)
if err != nil {
	log.Fatal(err)
}
```

## Cloud Pub/Sub [![GoDoc](https://godoc.org/cloud.google.com/go/pubsub?status.svg)](https://godoc.org/cloud.google.com/go/pubsub)

- [About Cloud Pubsub][cloud-pubsub]
- [API documentation][cloud-pubsub-docs]
- [Go client documentation](https://godoc.org/cloud.google.com/go/pubsub)
- [Complete sample programs](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/pubsub)

### Example Usage

First create a `pubsub.Client` to use throughout your application:

[snip]:# (pubsub-1)
```go
client, err := pubsub.NewClient(ctx, "project-id")
if err != nil {
	log.Fatal(err)
}
```

Then use the client to publish and subscribe:

[snip]:# (pubsub-2)
```go
// Publish "hello world" on topic1.
topic := client.Topic("topic1")
res := topic.Publish(ctx, &pubsub.Message{
	Data: []byte("hello world"),
})
// The publish happens asynchronously.
// Later, you can get the result from res:
...
msgID, err := res.Get(ctx)
if err != nil {
	log.Fatal(err)
}

// Use a callback to receive messages via subscription1.
sub := client.Subscription("subscription1")
err = sub.Receive(ctx, func(ctx context.Context, m *pubsub.Message) {
	fmt.Println(m.Data)
	m.Ack() // Acknowledge that we've consumed the message.
})
if err != nil {
	log.Println(err)
}
```

## Cloud BigQuery [![GoDoc](https://godoc.org/cloud.google.com/go/bigquery?status.svg)](https://godoc.org/cloud.google.com/go/bigquery)

- [About Cloud BigQuery][cloud-bigquery]
- [API documentation][cloud-bigquery-docs]
- [Go client documentation][cloud-bigquery-ref]
- [Complete sample programs](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/bigquery)

### Example Usage

First create a `bigquery.Client` to use throughout your application:
[snip]:# (bq-1)
```go
c, err := bigquery.NewClient(ctx, "my-project-ID")
if err != nil {
	// TODO: Handle error.
}
```

Then use that client to interact with the API:
[snip]:# (bq-2)
```go
// Construct a query.
q := c.Query(`
    SELECT year, SUM(number)
    FROM [bigquery-public-data:usa_names.usa_1910_2013]
    WHERE name = "William"
    GROUP BY year
    ORDER BY year
`)
// Execute the query.
it, err := q.Read(ctx)
if err != nil {
	// TODO: Handle error.
}
// Iterate through the results.
for {
	var values []bigquery.Value
	err := it.Next(&values)
	if err == iterator.Done {
		break
	}
	if err != nil {
		// TODO: Handle error.
	}
	fmt.Println(values)
}
```


## Stackdriver Logging [![GoDoc](https://godoc.org/cloud.google.com/go/logging?status.svg)](https://godoc.org/cloud.google.com/go/logging)

- [About Stackdriver Logging][cloud-logging]
- [API documentation][cloud-logging-docs]
- [Go client documentation][cloud-logging-ref]
- [Complete sample programs](https://github.com/GoogleCloudPlatform/golang-samples/tree/master/logging)

### Example Usage

First create a `logging.Client` to use throughout your application:
[snip]:# (logging-1)
```go
ctx := context.Background()
client, err := logging.NewClient(ctx, "my-project")
if err != nil {
	// TODO: Handle error.
}
```

Usually, you'll want to add log entries to a buffer to be periodically flushed
(automatically and asynchronously) to the Stackdriver Logging service.
[snip]:# (logging-2)
```go
logger := client.Logger("my-log")
logger.Log(logging.Entry{Payload: "something happened!"})
```

Close your client before your program exits, to flush any buffered log entries.
[snip]:# (logging-3)
```go
err = client.Close()
if err != nil {
	// TODO: Handle error.
}
```

## Cloud Spanner [![GoDoc](https://godoc.org/cloud.google.com/go/spanner?status.svg)](https://godoc.org/cloud.google.com/go/spanner)

- [About Cloud Spanner][cloud-spanner]
- [API documentation][cloud-spanner-docs]
- [Go client documentation](https://godoc.org/cloud.google.com/go/spanner)

### Example Usage

First create a `spanner.Client` to use throughout your application:

[snip]:# (spanner-1)
```go
client, err := spanner.NewClient(ctx, "projects/P/instances/I/databases/D")
if err != nil {
	log.Fatal(err)
}
```

[snip]:# (spanner-2)
```go
// Simple Reads And Writes
_, err = client.Apply(ctx, []*spanner.Mutation{
	spanner.Insert("Users",
		[]string{"name", "email"},
		[]interface{}{"alice", "a@example.com"})})
if err != nil {
	log.Fatal(err)
}
row, err := client.Single().ReadRow(ctx, "Users",
	spanner.Key{"alice"}, []string{"email"})
if err != nil {
	log.Fatal(err)
}
```


## Contributing

Contributions are welcome. Please, see the
[CONTRIBUTING](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md)
document for details. We're using Gerrit for our code reviews. Please don't open pull
requests against this repo, new pull requests will be automatically closed.

Please note that this project is released with a Contributor Code of Conduct.
By participating in this project you agree to abide by its terms.
See [Contributor Code of Conduct](https://github.com/GoogleCloudPlatform/google-cloud-go/blob/master/CONTRIBUTING.md#contributor-code-of-conduct)
for more information.

[cloud-datastore]: https://cloud.google.com/datastore/
[cloud-datastore-ref]: https://godoc.org/cloud.google.com/go/datastore
[cloud-datastore-docs]: https://cloud.google.com/datastore/docs
[cloud-datastore-activation]: https://cloud.google.com/datastore/docs/activate

[cloud-pubsub]: https://cloud.google.com/pubsub/
[cloud-pubsub-ref]: https://godoc.org/cloud.google.com/go/pubsub
[cloud-pubsub-docs]: https://cloud.google.com/pubsub/docs

[cloud-storage]: https://cloud.google.com/storage/
[cloud-storage-ref]: https://godoc.org/cloud.google.com/go/storage
[cloud-storage-docs]: https://cloud.google.com/storage/docs
[cloud-storage-create-bucket]: https://cloud.google.com/storage/docs/cloud-console#_creatingbuckets

[cloud-bigtable]: https://cloud.google.com/bigtable/
[cloud-bigtable-ref]: https://godoc.org/cloud.google.com/go/bigtable

[cloud-bigquery]: https://cloud.google.com/bigquery/
[cloud-bigquery-docs]: https://cloud.google.com/bigquery/docs
[cloud-bigquery-ref]: https://godoc.org/cloud.google.com/go/bigquery

[cloud-logging]: https://cloud.google.com/logging/
[cloud-logging-docs]: https://cloud.google.com/logging/docs
[cloud-logging-ref]: https://godoc.org/cloud.google.com/go/logging

[cloud-monitoring]: https://cloud.google.com/monitoring/
[cloud-monitoring-ref]: https://godoc.org/cloud.google.com/go/monitoring/apiv3

[cloud-vision]: https://cloud.google.com/vision
[cloud-vision-ref]: https://godoc.org/cloud.google.com/go/vision/apiv1

[cloud-language]: https://cloud.google.com/natural-language
[cloud-language-ref]: https://godoc.org/cloud.google.com/go/language/apiv1

[cloud-speech]: https://cloud.google.com/speech
[cloud-speech-ref]: https://godoc.org/cloud.google.com/go/speech/apiv1

[cloud-spanner]: https://cloud.google.com/spanner/
[cloud-spanner-ref]: https://godoc.org/cloud.google.com/go/spanner
[cloud-spanner-docs]: https://cloud.google.com/spanner/docs

[cloud-translation]: https://cloud.google.com/translation
[cloud-translation-ref]: https://godoc.org/cloud.google.com/go/translation

[cloud-trace]: https://cloud.google.com/trace/
[cloud-trace-ref]: https://godoc.org/cloud.google.com/go/trace

[cloud-video]: https://cloud.google.com/video-intelligence/
[cloud-video-ref]: https://godoc.org/cloud.google.com/go/videointelligence/apiv1beta1

[cloud-errors]: https://cloud.google.com/error-reporting/
[cloud-errors-ref]: https://godoc.org/cloud.google.com/go/errorreporting

[default-creds]: https://developers.google.com/identity/protocols/application-default-credentials