Google Cloud for Go

import "cloud.google.com/go"

Go packages for Google Cloud Platform services.

NOTE: These packages are under development, and may occasionally make backwards-incompatible changes.

NOTE: Github repo is a mirror of https://code.googlesource.com/gocloud.

News

October 10, 2016

Breaking changes to cloud.google.com/go/storage:

• AdminClient replaced by methods on Client. Replace

  adminClient.CreateBucket(ctx, bucketName, attrs)

  with

  client.Bucket(bucketName).Create(ctx, projectID, attrs)

• BucketHandle.List replaced by BucketHandle.Objects. Replace

  for query != nil {
      objs, err := bucket.List(d.ctx, query)
      if err != nil { ... }
      query = objs.Next
      for _, obj := range objs.Results {
          fmt.Println(obj)
      }
  }

  with

  iter := bucket.Objects(d.ctx, query)
  for {
      obj, err := iter.Next()
      if err == iterator.Done {
          break
      }
      if err != nil { ... }
      fmt.Println(obj)
  }

  (The iterator package is at google.golang.org/api/iterator.)

  Replace Query.Cursor with ObjectIterator.PageInfo().Token.

  Replace Query.MaxResults with ObjectIterator.PageInfo().MaxSize.

• ObjectHandle.CopyTo replaced by ObjectHandle.CopierFrom. Replace

  attrs, err := src.CopyTo(ctx, dst, nil)

  with

  attrs, err := dst.CopierFrom(src).Run(ctx)

  Replace

  attrs, err := src.CopyTo(ctx, dst, &storage.ObjectAttrs{ContextType: "text/html"})

  with

  c := dst.CopierFrom(src)
  c.ContextType = "text/html"
  attrs, err := c.Run(ctx)

• ObjectHandle.ComposeFrom replaced by ObjectHandle.ComposerFrom. Replace

  attrs, err := dst.ComposeFrom(ctx, []*storage.ObjectHandle{src1, src2}, nil)

  with

  attrs, err := dst.ComposerFrom(src1, src2).Run(ctx)

• ObjectHandle.Update's ObjectAttrs argument replaced by ObjectAttrsToUpdate. Replace

  attrs, err := obj.Update(ctx, &storage.ObjectAttrs{ContextType: "text/html"})

  with

  attrs, err := obj.Update(ctx, storage.ObjectAttrsToUpdate{ContextType: "text/html"})

• ObjectHandle.WithConditions replaced by ObjectHandle.If. Replace

  obj.WithConditions(storage.Generation(gen), storage.IfMetaGenerationMatch(mgen))

  with

  obj.Generation(gen).If(storage.Conditions{MetagenerationMatch: mgen})

  Replace

  obj.WithConditions(storage.IfGenerationMatch(0))

  with

  obj.If(storage.Conditions{DoesNotExist: true})

• storage.Done replaced by iterator.Done (from package google.golang.org/api/iterator).

October 6, 2016

Package preview/logging deleted. Use logging instead.

September 27, 2016

Logging client replaced with preview version (see below).

September 8, 2016

• New clients for some of Google's Machine Learning APIs: Vision, Speech, and Natural Language.

• Preview version of a new Stackdriver Logging client in cloud.google.com/go/preview/logging. This client uses gRPC as its transport layer, and supports log reading, sinks and metrics. It will replace the current client at cloud.google.com/go/logging shortly.

Supported APIs

Google API	Status	Package
Datastore	beta	cloud.google.com/go/datastore
Storage	beta	cloud.google.com/go/storage
Pub/Sub	experimental	cloud.google.com/go/pubsub
Bigtable	beta	cloud.google.com/go/bigtable
BigQuery	experimental	cloud.google.com/go/bigquery
Logging	experimental	cloud.google.com/go/logging
Vision	experimental	cloud.google.com/go/vision
Language	experimental	cloud.google.com/go/language/apiv1beta1
Speech	experimental	cloud.google.com/go/speech/apiv1beta

Experimental 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 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.

Authorization

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

To authorize using a JSON key file, pass option.WithServiceAccountFile to the NewClient function of the desired package. For example:

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 package to create an oauth2.TokenSource. Then pass option.WithTokenSource to the NewClient function:

tokenSource := ...
client, err := storage.NewClient(ctx, option.WithTokenSource(tokenSource))

Cloud Datastore

• About Cloud Datastore
• Activating the API for your project
• API documentation
• Go client documentation
• Complete sample program

Example Usage

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

client, err := datastore.NewClient(ctx, "my-project-id")
if err != nil {
	log.Fatal(err)
}

Then use that client to interact with the API:

type Post struct {
	Title       string
	Body        string `datastore:",noindex"`
	PublishedAt time.Time
}
keys := []*datastore.Key{
	datastore.NewKey(ctx, "Post", "post1", 0, nil),
	datastore.NewKey(ctx, "Post", "post2", 0, 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

• About Cloud Storage
• API documentation
• Go client documentation
• Complete sample programs

Example Usage

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

client, err := storage.NewClient(ctx)
if err != nil {
	log.Fatal(err)
}

// 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

• About Cloud Pubsub
• API documentation
• Go client documentation
• Complete sample programs

Example Usage

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

client, err := pubsub.NewClient(ctx, "project-id")
if err != nil {
	log.Fatal(err)
}

// Publish "hello world" on topic1.
topic := client.Topic("topic1")
msgIDs, err := topic.Publish(ctx, &pubsub.Message{
	Data: []byte("hello world"),
})
if err != nil {
	log.Fatal(err)
}

// Create an iterator to pull messages via subscription1.
it, err := client.Subscription("subscription1").Pull(ctx)
if err != nil {
	log.Println(err)
}
defer it.Stop()

// Consume N messages from the iterator.
for i := 0; i < N; i++ {
	msg, err := it.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		log.Fatalf("Failed to retrieve message: %v", err)
	}

	fmt.Printf("Message %d: %s\n", i, msg.Data)
	msg.Done(true) // Acknowledge that we've consumed the message.
}

Cloud BigQuery

• About Cloud BigQuery
• API documentation
• Go client documentation
• Complete sample programs

Example Usage

First create a bigquery.Client to use throughout your application:

c, err := bigquery.NewClient(ctx, "my-project-ID")
if err != nil {
    // TODO: Handle error.
}

Then use that client to interact with the API:

// 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 it.Next(ctx) {
    // Retrieve the current row into a list of values.
    var values bigquery.ValueList
    if err := it.Get(&values); err != nil {
        // TODO: Handle error.
    }
    fmt.Println(values)
}
if it.Err() != nil {
    // TODO: Handle it.Err()
}

Stackdriver Logging

• About Stackdriver Logging
• API documentation
• Go client documentation
• Complete sample programs

Example Usage

First create a logging.Client to use throughout your application:

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.

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.

err = client.Close()
if err != nil {
    // TODO: Handle error.
}

Contributing

Contributions are welcome. Please, see the CONTRIBUTING 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 for more information.