19 KiB
Google Cloud Client Libraries for Go
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
- Supported APIs
- Go Versions Supported
- Authorization
- Cloud Datastore
- Cloud Storage
- Cloud Pub/Sub
- Cloud BigQuery
- Stackdriver Logging
- Cloud Spanner
News
April 9, 2018
v0.21.0
-
bigquery:
- Add OpenCensus tracing.
-
firestore:
- BREAKING CHANGE: If a document does not exist, return a DocumentSnapshot whose Exists method returns false. DocumentRef.Get and Transaction.Get return the non-nil DocumentSnapshot in addition to a NotFound error. DocumentRef.GetAll and Transaction.GetAll return a non-nil DocumentSnapshot instead of nil.
- Add DocumentIterator.Stop. Call Stop whenever you are done with a DocumentIterator.
- Added Query.Snapshots and DocumentRef.Snapshots, which provide realtime notification of updates. See https://cloud.google.com/firestore/docs/query-data/listen.
- Canceling an RPC now always returns a grpc.Status with codes.Canceled.
-
spanner:
- Add
CommitTimestamp, which supports inserting the commit timestamp of a transaction into a column.
- Add
March 22, 2018
v0.20.0
-
bigquery: Support SchemaUpdateOptions for load jobs.
-
bigtable:
- Add SampleRowKeys.
- cbt: Support union, intersection GCPolicy.
- Retry admin RPCS.
- Add trace spans to retries.
-
datastore: Add OpenCensus tracing.
-
firestore:
- Fix queries involving Null and NaN.
- Allow Timestamp protobuffers for time values.
-
logging: Add a WriteTimeout option.
-
spanner: Support Batch API.
-
storage: Add OpenCensus tracing.
February 26, 2018
v0.19.0
-
bigquery:
- Support customer-managed encryption keys.
-
bigtable:
- Improved emulator support.
- Support GetCluster.
-
datastore:
- Add general mutations.
- Support pointer struct fields.
- Support transaction options.
-
firestore:
- Add Transaction.GetAll.
- Support document cursors.
-
logging:
- Support concurrent RPCs to the service.
- Support per-entry resources.
-
profiler:
- Add config options to disable heap and thread profiling.
- Read the project ID from $GOOGLE_CLOUD_PROJECT when it's set.
-
pubsub:
- BEHAVIOR CHANGE: Release flow control after ack/nack (instead of after the callback returns).
- Add SubscriptionInProject.
- Add OpenCensus instrumentation for streaming pull.
-
storage:
- Support CORS.
January 18, 2018
v0.18.0
-
bigquery:
- Marked stable.
- Schema inference of nullable fields supported.
- Added TimePartitioning to QueryConfig.
-
firestore: Data provided to DocumentRef.Set with a Merge option can contain Delete sentinels.
-
logging: Clients can accept parent resources other than projects.
-
pubsub:
- pubsub/pstest: A lighweight fake for pubsub. Experimental; feedback welcome.
- Support updating more subscription metadata: AckDeadline, RetainAckedMessages and RetentionDuration.
-
oslogin/apiv1beta: New client for the Cloud OS Login API.
-
rpcreplay: A package for recording and replaying gRPC traffic.
-
spanner:
- Add a ReadWithOptions that supports a row limit, as well as an index.
- Support query plan and execution statistics.
- Added OpenCensus support.
-
storage: Clarify checksum validation for gzipped files (it is not validated when the file is served uncompressed).
December 11, 2017
v0.17.0
- firestore BREAKING CHANGES:
-
Remove UpdateMap and UpdateStruct; rename UpdatePaths to Update. Change
docref.UpdateMap(ctx, map[string]interface{}{"a.b", 1})todocref.Update(ctx, []firestore.Update{{Path: "a.b", Value: 1}})Change
docref.UpdateStruct(ctx, []string{"Field"}, aStruct)todocref.Update(ctx, []firestore.Update{{Path: "Field", Value: aStruct.Field}}) -
Rename MergePaths to Merge; require args to be FieldPaths
-
A value stored as an integer can be read into a floating-point field, and vice versa.
-
- bigtable/cmd/cbt:
- Support deleting a column.
- Add regex option for row read.
- spanner: Mark stable.
- storage:
- Add Reader.ContentEncoding method.
- Fix handling of SignedURL headers.
- bigquery:
- If Uploader.Put is called with no rows, it returns nil without making a call.
- Schema inference supports the "nullable" option in struct tags for non-required fields.
- TimePartitioning supports "Field".
Supported APIs
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 
- 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.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 
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 
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 
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 
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 
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.