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Published: May 26, 2017 License: Apache-2.0 Imports: 0 Imported by: 0

README

Google Cloud Client Libraries for Go

GoDoc

Go packages for Google Cloud Platform services.

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.

News

March 17, 2017

Breaking Pubsub changes.

  • Publish is now asynchronous (announcement).
  • Subscription.Pull replaced by Subscription.Receive, which takes a callback (announcement).
  • Message.Done replaced with Message.Ack and Message.Nack.

February 14, 2017

Release of a client library for Spanner. See the blog post.

Note that although the Spanner service is beta, the Go client library is alpha.

Older news

Supported APIs

Google API Status Package
Datastore stable cloud.google.com/go/datastore
Storage stable cloud.google.com/go/storage
Bigtable beta cloud.google.com/go/bigtable
BigQuery beta cloud.google.com/go/bigquery
Logging stable cloud.google.com/go/logging
Monitoring alpha cloud.google.com/go/monitoring/apiv3
Pub/Sub alpha cloud.google.com/go/pubsub
Vision beta cloud.google.com/go/vision
Language alpha cloud.google.com/go/language/apiv1
Speech alpha cloud.google.com/go/speech/apiv1
Spanner alpha cloud.google.com/go/spanner
Translation beta cloud.google.com/go/translate

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 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.

client, err := storage.NewClient(ctx)

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: snip:# (auth-ts)

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.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

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)
}

Then use the client to publish and subscribe:

// 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

Example Usage

First create a bigquery.Client to use throughout your application: snip:# (bq-1)

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)

// 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

Example Usage

First create a logging.Client to use throughout your application: snip:# (logging-1)

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)

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)

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

Cloud Spanner GoDoc

Example Usage

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

client, err := spanner.NewClient(ctx, "projects/P/instances/I/databases/D")
if err != nil {
	log.Fatal(err)
}
// 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 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.

Documentation

Overview

Package cloud is the root of the packages used to access Google Cloud Services. See https://godoc.org/cloud.google.com/go for a full list of sub-packages.

This package documents how to authorize and authenticate the sub packages.

Example (ApplicationDefaultCredentials)
package main

import (
	"cloud.google.com/go/datastore"
	"golang.org/x/net/context"
)

func main() {
	// Google Application Default Credentials is the recommended way to authorize
	// and authenticate clients.
	//
	// See the following link on how to create and obtain Application Default Credentials:
	// https://developers.google.com/identity/protocols/application-default-credentials.
	client, err := datastore.NewClient(context.Background(), "project-id")
	if err != nil {
		// TODO: handle error.
	}
	_ = client // Use the client.
}
Output:

Example (ServiceAccountFile)
package main

import (
	"cloud.google.com/go/datastore"
	"golang.org/x/net/context"
	"google.golang.org/api/option"
)

func main() {
	// Use a JSON key file associated with a Google service account to
	// authenticate and authorize. Service Account keys can be created and
	// downloaded from https://console.developers.google.com/permissions/serviceaccounts.
	//
	// Note: This example uses the datastore client, but the same steps apply to
	// the other client libraries underneath this package.
	client, err := datastore.NewClient(context.Background(),
		"project-id", option.WithServiceAccountFile("/path/to/service-account-key.json"))
	if err != nil {
		// TODO: handle error.
	}
	_ = client // Use the client.
}
Output:

Directories

Path Synopsis
Package bigquery provides a client for the BigQuery service.
Package bigquery provides a client for the BigQuery service.
Package bigtable is an API to Google Cloud Bigtable.
Package bigtable is an API to Google Cloud Bigtable.
bttest
Package bttest contains test helpers for working with the bigtable package.
Package bttest contains test helpers for working with the bigtable package.
cmd/cbt
Cbt is a tool for doing basic interactions with Cloud Bigtable.
Cbt is a tool for doing basic interactions with Cloud Bigtable.
cmd/emulator
cbtemulator launches the in-memory Cloud Bigtable server on the given address.
cbtemulator launches the in-memory Cloud Bigtable server on the given address.
cmd/loadtest
Loadtest does some load testing through the Go client library for Cloud Bigtable.
Loadtest does some load testing through the Go client library for Cloud Bigtable.
cmd/scantest
Scantest does scan-related load testing against Cloud Bigtable.
Scantest does scan-related load testing against Cloud Bigtable.
internal/cbtconfig
Package cbtconfig encapsulates common code for reading configuration from .cbtrc and gcloud.
Package cbtconfig encapsulates common code for reading configuration from .cbtrc and gcloud.
internal/gax
This is ia snapshot from github.com/googleapis/gax-go with minor modifications.
This is ia snapshot from github.com/googleapis/gax-go with minor modifications.
internal/option
Package option contains common code for dealing with client options.
Package option contains common code for dealing with client options.
Package civil implements types for civil time, a time-zone-independent representation of time that follows the rules of the proleptic Gregorian calendar with exactly 24-hour days, 60-minute hours, and 60-second minutes.
Package civil implements types for civil time, a time-zone-independent representation of time that follows the rules of the proleptic Gregorian calendar with exactly 24-hour days, 60-minute hours, and 60-second minutes.
cmd
go-cloud-debug-agent/internal/breakpoints
Package breakpoints handles breakpoint requests we get from the user through the Debuglet Controller, and manages corresponding breakpoints set in the code.
Package breakpoints handles breakpoint requests we get from the user through the Debuglet Controller, and manages corresponding breakpoints set in the code.
go-cloud-debug-agent/internal/controller
Package controller is a library for interacting with the Google Cloud Debugger's Debuglet Controller service.
Package controller is a library for interacting with the Google Cloud Debugger's Debuglet Controller service.
go-cloud-debug-agent/internal/valuecollector
Package valuecollector is used to collect the values of variables in a program.
Package valuecollector is used to collect the values of variables in a program.
compute
metadata
Package metadata provides access to Google Compute Engine (GCE) metadata and API service accounts.
Package metadata provides access to Google Compute Engine (GCE) metadata and API service accounts.
Package container contains a deprecated Google Container Engine client.
Package container contains a deprecated Google Container Engine client.
Package datastore provides a client for Google Cloud Datastore.
Package datastore provides a client for Google Cloud Datastore.
debugger
apiv2
Package debugger is an experimental, auto-generated package for the debugger API.
Package debugger is an experimental, auto-generated package for the debugger API.
errorreporting
apiv1beta1
Package errorreporting is an experimental, auto-generated package for the errorreporting API.
Package errorreporting is an experimental, auto-generated package for the errorreporting API.
Package errors is a Google Stackdriver Error Reporting library.
Package errors is a Google Stackdriver Error Reporting library.
iam
Package iam supports the resource-specific operations of Google Cloud IAM (Identity and Access Management) for the Google Cloud Libraries.
Package iam supports the resource-specific operations of Google Cloud IAM (Identity and Access Management) for the Google Cloud Libraries.
admin/apiv1
Package admin is an experimental, auto-generated package for the admin API.
Package admin is an experimental, auto-generated package for the admin API.
atomiccache
Package atomiccache provides a map-based cache that supports very fast reads.
Package atomiccache provides a map-based cache that supports very fast reads.
fields
Package fields provides a view of the fields of a struct that follows the Go rules, amended to consider tags and case insensitivity.
Package fields provides a view of the fields of a struct that follows the Go rules, amended to consider tags and case insensitivity.
optional
Package optional provides versions of primitive types that can be nil.
Package optional provides versions of primitive types that can be nil.
pretty
Package pretty implements a simple pretty-printer.
Package pretty implements a simple pretty-printer.
testutil
Package testutil contains helper functions for writing tests.
Package testutil contains helper functions for writing tests.
version
Package version contains version information for Google Cloud Client Libraries for Go, as reported in request headers.
Package version contains version information for Google Cloud Client Libraries for Go, as reported in request headers.
language
apiv1
Package language is an experimental, auto-generated package for the language API.
Package language is an experimental, auto-generated package for the language API.
apiv1beta2
Package language is an experimental, auto-generated package for the language API.
Package language is an experimental, auto-generated package for the language API.
Package logging contains a Stackdriver Logging client suitable for writing logs.
Package logging contains a Stackdriver Logging client suitable for writing logs.
apiv2
Package logging is an experimental, auto-generated package for the logging API.
Package logging is an experimental, auto-generated package for the logging API.
internal/testing
Package testing provides support for testing the logging client.
Package testing provides support for testing the logging client.
logadmin
Package logadmin contains a Stackdriver Logging client that can be used for reading logs and working with sinks, metrics and monitored resources.
Package logadmin contains a Stackdriver Logging client that can be used for reading logs and working with sinks, metrics and monitored resources.
Package longrunning supports Long Running Operations for the Google Cloud Libraries.
Package longrunning supports Long Running Operations for the Google Cloud Libraries.
autogen
Package longrunning is an experimental, auto-generated package for the longrunning API.
Package longrunning is an experimental, auto-generated package for the longrunning API.
monitoring
apiv3
Package monitoring is an experimental, auto-generated package for the monitoring API.
Package monitoring is an experimental, auto-generated package for the monitoring API.
Package pubsub provides an easy way to publish and receive Google Cloud Pub/Sub messages, hiding the the details of the underlying server RPCs.
Package pubsub provides an easy way to publish and receive Google Cloud Pub/Sub messages, hiding the the details of the underlying server RPCs.
apiv1
Package pubsub is an experimental, auto-generated package for the pubsub API.
Package pubsub is an experimental, auto-generated package for the pubsub API.
loadtest
Package loadtest implements load testing for pubsub, following the interface defined in https://github.com/GoogleCloudPlatform/pubsub/tree/master/load-test-framework/ .
Package loadtest implements load testing for pubsub, following the interface defined in https://github.com/GoogleCloudPlatform/pubsub/tree/master/load-test-framework/ .
loadtest/pb
Package google_pubsub_loadtest is a generated protocol buffer package.
Package google_pubsub_loadtest is a generated protocol buffer package.
Package spanner provides a client for reading and writing to Cloud Spanner databases.
Package spanner provides a client for reading and writing to Cloud Spanner databases.
admin/database/apiv1
Package database is an experimental, auto-generated package for the database API.
Package database is an experimental, auto-generated package for the database API.
admin/instance/apiv1
Package instance is an experimental, auto-generated package for the instance API.
Package instance is an experimental, auto-generated package for the instance API.
speech
apiv1
Package speech is an experimental, auto-generated package for the speech API.
Package speech is an experimental, auto-generated package for the speech API.
apiv1beta1
Package speech is an experimental, auto-generated package for the speech API.
Package speech is an experimental, auto-generated package for the speech API.
Package storage provides an easy way to work with Google Cloud Storage.
Package storage provides an easy way to work with Google Cloud Storage.
Package trace is a Google Stackdriver Trace library.
Package trace is a Google Stackdriver Trace library.
apiv1
Package trace is an experimental, auto-generated package for the trace API.
Package trace is an experimental, auto-generated package for the trace API.
Package translate is a client for the Google Translation API.
Package translate is a client for the Google Translation API.
internal/translate/v2
Package translate provides access to the Translate API.
Package translate provides access to the Translate API.
videointelligence
apiv1beta1
Package videointelligence is an experimental, auto-generated package for the videointelligence API.
Package videointelligence is an experimental, auto-generated package for the videointelligence API.
Package vision provides a client for the Google Cloud Vision API.
Package vision provides a client for the Google Cloud Vision API.
apiv1
Package vision is an experimental, auto-generated package for the vision API.
Package vision is an experimental, auto-generated package for the vision API.

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