cloud

README

Google Cloud for Go

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

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

Go packages for Google Cloud Platform services. Supported APIs include:

• Google Cloud Datastore
• Google Cloud Storage
• Google Cloud Pub/Sub
• Google Cloud Container Engine

import "google.golang.org/cloud"

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

Authorization

Authorization, throughout the package, is delegated to the godoc.org/golang.org/x/oauth2. Refer to the godoc documentation for examples on using oauth2 with the Cloud package.

Google Cloud Datastore

Google Cloud Datastore (docs) is a fully managed, schemaless database for storing non-relational data. Cloud Datastore automatically scales with your users and supports ACID transactions, high availability of reads and writes, strong consistency for reads and ancestor queries, and eventual consistency for all other queries.

Follow the activation instructions to use the Google Cloud Datastore API with your project.

https://godoc.org/google.golang.org/cloud/datastore

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 := datastore.PutMulti(ctx, keys, posts); err != nil {
	log.Println(err)
}

Google Cloud Storage

Google Cloud Storage (docs) allows you to store data on Google infrastructure with very high reliability, performance and availability, and can be used to distribute large data objects to users via direct download.

https://godoc.org/google.golang.org/cloud/storage

// Read the object1 from bucket.
rc, err := storage.NewReader(ctx, "bucket", "object1")
if err != nil {
	log.Fatal(err)
}
slurp, err := ioutil.ReadAll(rc)
rc.Close()
if err != nil {
	log.Fatal(err)
}

Google Cloud Pub/Sub (Alpha)

Google Cloud Pub/Sub is in Alpha status. As a result, it might change in backward-incompatible ways and is not recommended for production use. It is not subject to any SLA or deprecation policy.

Google Cloud Pub/Sub (docs) allows you to connect your services with reliable, many-to-many, asynchronous messaging hosted on Google's infrastructure. Cloud Pub/Sub automatically scales as you need it and provides a foundation for building your own robust, global services.

https://godoc.org/google.golang.org/cloud/pubsub

// Publish "hello world" on topic1.
msgIDs, err := pubsub.Publish(ctx, "topic1", &pubsub.Message{
	Data: []byte("hello world"),
})
if err != nil {
	log.Println(err)
}
// Pull messages via subscription1.
msgs, err := pubsub.Pull(ctx, "subscription1", 1)
if err != nil {
	log.Println(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.

Documentation

Overview

Package cloud contains Google Cloud Platform APIs related types and common functions.

Index

• func NewContext(projID string, c *http.Client) context.Context
• func WithContext(parent context.Context, projID string, c *http.Client) context.Context
• type ClientOption
  • func WithBaseGRPC(client *grpc.ClientConn) ClientOption
  • func WithBaseHTTP(client *http.Client) ClientOption
  • func WithEndpoint(url string) ClientOption
  • func WithScopes(scope ...string) ClientOption
  • func WithTokenSource(s oauth2.TokenSource) ClientOption
  • func WithUserAgent(ua string) ClientOption

Functions

func NewContext

func NewContext(projID string, c *http.Client) context.Context

NewContext returns a new context that uses the provided http.Client. Provided http.Client is responsible to authorize and authenticate the requests made to the Google Cloud APIs. It mutates the client's original Transport to append the cloud package's user-agent to the outgoing requests. You can obtain the project ID from the Google Developers Console, https://console.developers.google.com.

func WithContext

func WithContext(parent context.Context, projID string, c *http.Client) context.Context

WithContext returns a new context in a similar way NewContext does, but initiates the new context with the specified parent.

Types

type ClientOption

type ClientOption interface {
	// Resolve configures the given DialOpts for this option.
	Resolve(*opts.DialOpt)
}

ClientOption is used when construct clients for each cloud service.

func WithBaseGRPC

func WithBaseGRPC(client *grpc.ClientConn) ClientOption

WithBaseGRPC returns a ClientOption that specifies the GRPC client connection to use as the basis of communications. This option many only be used with services that support HRPC as their communication transport.

func WithBaseHTTP

func WithBaseHTTP(client *http.Client) ClientOption

WithBaseHTTP returns a ClientOption that specifies the HTTP client to use as the basis of communications. This option may only be used with services that support HTTP as their communication transport.

func WithEndpoint

func WithEndpoint(url string) ClientOption

WithEndpoint returns a ClientOption that overrides the default endpoint to be used for a service.

func WithScopes

func WithScopes(scope ...string) ClientOption

WithScopes returns a ClientOption that overrides the default OAuth2 scopes to be used for a service.

func WithTokenSource

func WithTokenSource(s oauth2.TokenSource) ClientOption

WithTokenSource returns a ClientOption that specifies an OAuth2 token source to be used as the basis for authentication.

func WithUserAgent

func WithUserAgent(ua string) ClientOption

WithUserAgent returns a ClientOption that sets the User-Agent.