before ValueList removal and inference changes
bigquery: support struct field parameters

See #390.

Change-Id: I4006c8f17dc7131997d096701420ea3fc1e13174
Reviewed-on: https://code-review.googlesource.com/9559
Reviewed-by: Ross Light <light@google.com>
3 files changed
tree: 2beee7d5adc1a5e4399a60a22c36343be6e038e5
  1. .travis.yml
  2. AUTHORS
  3. CONTRIBUTING.md
  4. CONTRIBUTORS
  5. LICENSE
  6. README.md
  7. appveyor.yml
  8. authexample_test.go
  9. bigquery/
  10. bigtable/
  11. civil/
  12. cloud.go
  13. cmd/
  14. compute/
  15. container/
  16. datastore/
  17. debugger/
  18. errorreporting/
  19. errors/
  20. examples/
  21. iam/
  22. internal/
  23. key.json.enc
  24. language/
  25. license_test.go
  26. logging/
  27. longrunning/
  28. monitoring/
  29. old-news.md
  30. pubsub/
  31. speech/
  32. storage/
  33. trace/
  34. translate/
  35. vision/
README.md

Google Cloud for Go

Build Status GoDoc

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

November 17, 2016

Change to BigQuery: values from INTEGER columns will now be returned as int64, not int. This will avoid errors arising from large values on 32-bit systems.

November 8, 2016

New datastore feature: datastore now encodes your nested Go structs as Entity values, instead of a flattened list of the embedded struct's fields. This means that you may now have twice-nested slices, eg.

type State struct {
  Cities  []struct{
    Populations []int
  }
}

See the announcement for more details.

November 8, 2016

Breaking changes to datastore: contexts no longer hold namespaces; instead you must set a key's namespace explicitly. Also, key functions have been changed and renamed.

  • The WithNamespace function has been removed. To specify a namespace in a Query, use the Query.Namespace method:

    q := datastore.NewQuery("Kind").Namespace("ns")
    
  • All the fields of Key are exported. That means you can construct any Key with a struct literal:

    k := &Key{Kind: "Kind",  ID: 37, Namespace: "ns"}
    
  • As a result of the above, the Key methods Kind, ID, d.Name, Parent, SetParent and Namespace have been removed.

  • NewIncompleteKey has been removed, replaced by IncompleteKey. Replace

    NewIncompleteKey(ctx, kind, parent)
    

    with

    IncompleteKey(kind, parent)
    

    and if you do use namespaces, make sure you set the namespace on the returned key.

  • NewKey has been removed, replaced by NameKey and IDKey. Replace

    NewKey(ctx, kind, name, 0, parent)
    NewKey(ctx, kind, "", id, parent)
    

    with

    NameKey(kind, name, parent)
    IDKey(kind, id, parent)
    

    and if you do use namespaces, make sure you set the namespace on the returned key.

  • The Done variable has been removed. Replace datastore.Done with iterator.Done, from the package google.golang.org/api/iterator.

  • The Client.Close method will have a return type of error. It will return the result of closing the underlying gRPC connection.

See the announcement for more details.

October 27, 2016

Breaking change to bigquery: NewGCSReference is now a function, not a method on Client.

New bigquery feature: Table.LoaderFrom now accepts a ReaderSource, enabling loading data into a table from a file or any io.Reader.

October 21, 2016

Breaking change to pubsub: removed pubsub.Done.

Use iterator.Done instead, where iterator is the package google.golang.org/api/iterator.

October 19, 2016

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

  • Client.Table and Client.OpenTable have been removed. Replace

    client.OpenTable("project", "dataset", "table")
    

    with

    client.DatasetInProject("project", "dataset").Table("table")
    
  • Client.CreateTable has been removed. Replace

    client.CreateTable(ctx, "project", "dataset", "table")
    

    with

    client.DatasetInProject("project", "dataset").Table("table").Create(ctx)
    
  • Dataset.ListTables have been replaced with Dataset.Tables. Replace

    tables, err := ds.ListTables(ctx)
    

    with

    it := ds.Tables(ctx)
    for {
        table, err := it.Next()
        if err == iterator.Done {
            break
        }
        if err != nil {
            // TODO: Handle error.
        }
        // TODO: use table.
    }
    
  • Client.Read has been replaced with Job.Read, Table.Read and Query.Read. Replace

    it, err := client.Read(ctx, job)
    

    with

    it, err := job.Read(ctx)
    

    and similarly for reading from tables or queries.

  • The iterator returned from the Read methods is now named RowIterator. Its behavior is closer to the other iterators in these libraries. It no longer supports the Schema method; see the next item. Replace

    for it.Next(ctx) {
        var vals ValueList
        if err := it.Get(&vals); err != nil {
            // TODO: Handle error.
        }
        // TODO: use vals.
    }
    if err := it.Err(); err != nil {
        // TODO: Handle error.
    }
    

    with

    for {
        var vals ValueList
        err := it.Next(&vals)
        if err == iterator.Done {
            break
        }
        if err != nil {
            // TODO: Handle error.
        }
        // TODO: use vals.
    }
    

    Instead of the RecordsPerRequest(n) option, write

    it.PageInfo().MaxSize = n
    

    Instead of the StartIndex(i) option, write

    it.StartIndex = i
    
  • ValueLoader.Load now takes a Schema in addition to a slice of Values. Replace

    func (vl *myValueLoader) Load(v []bigquery.Value)
    

    with

    func (vl *myValueLoader) Load(v []bigquery.Value, s bigquery.Schema)
    
  • Table.Patch is replace by Table.Update. Replace

    p := table.Patch()
    p.Description("new description")
    metadata, err := p.Apply(ctx)
    

    with

    metadata, err := table.Update(ctx, bigquery.TableMetadataToUpdate{
        Description: "new description",
    })
    
  • Client.Copy is replaced by separate methods for each of its four functions. All options have been replaced by struct fields.

    • To load data from Google Cloud Storage into a table, use Table.LoaderFrom.

      Replace

      client.Copy(ctx, table, gcsRef)
      

      with

      table.LoaderFrom(gcsRef).Run(ctx)
      

      Instead of passing options to Copy, set fields on the Loader:

      loader := table.LoaderFrom(gcsRef)
      loader.WriteDisposition = bigquery.WriteTruncate
      
    • To extract data from a table into Google Cloud Storage, use Table.ExtractorTo. Set fields on the returned Extractor instead of passing options.

      Replace

      client.Copy(ctx, gcsRef, table)
      

      with

      table.ExtractorTo(gcsRef).Run(ctx)
      
    • To copy data into a table from one or more other tables, use Table.CopierFrom. Set fields on the returned Copier instead of passing options.

      Replace

      client.Copy(ctx, dstTable, srcTable)
      

      with

      dst.Table.CopierFrom(srcTable).Run(ctx)
      
    • To start a query job, create a Query and call its Run method. Set fields on the query instead of passing options.

      Replace

      client.Copy(ctx, table, query)
      

      with

      query.Run(ctx)
      
  • Table.NewUploader has been renamed to Table.Uploader. Instead of options, configure an Uploader by setting its fields. Replace

    u := table.NewUploader(bigquery.UploadIgnoreUnknownValues())
    

    with

    u := table.NewUploader(bigquery.UploadIgnoreUnknownValues())
    u.IgnoreUnknownValues = true
    

Older news

Supported APIs

Google APIStatusPackage
Datastorebetacloud.google.com/go/datastore
Storagebetacloud.google.com/go/storage
Pub/Subexperimentalcloud.google.com/go/pubsub
Bigtablebetacloud.google.com/go/bigtable
BigQueryexperimentalcloud.google.com/go/bigquery
Loggingexperimentalcloud.google.com/go/logging
Visionexperimentalcloud.google.com/go/vision
Languageexperimentalcloud.google.com/go/language/apiv1beta1
Speechexperimentalcloud.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 GoDoc

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 GoDoc

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 GoDoc

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 GoDoc

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 {
    var values bigquery.ValueList
    err := it.Next(&values)
    if err == iterator.Done {
        break
    }
    if err != nil {
        // TODO: Handle error.
    }
    fmt.Println(values)
}

Stackdriver Logging GoDoc

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.