cloud

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Published: Nov 16, 2022 License: Apache-2.0 Imports: 0 Imported by: 6

README

Google Cloud Client Libraries for Go

Go Reference

Go packages for Google Cloud Platform services.

import "cloud.google.com/go"

To install the packages on your system, do not clone the repo. Instead:

  1. Change to your project directory:

    cd /my/cloud/project
    
  2. Get the package you want to use. Some products have their own module, so it's best to go get the package(s) you want to use:

    $ go get cloud.google.com/go/firestore # Replace with the package you want to use.
    

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

Supported APIs

For an updated list of all of our released APIs please see our reference docs.

Go Versions Supported

Our libraries are compatible with at least the three most recent, major Go releases. They are currently compatible with:

  • Go 1.19
  • Go 1.18
  • Go 1.17
  • Go 1.16
  • Go 1.15

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.WithCredentialsFile to the NewClient function of the desired package. For example:

client, err := storage.NewClient(ctx, option.WithCredentialsFile("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))

Contributing

Contributions are welcome. Please, see the CONTRIBUTING document for details.

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.

Client Options

All clients in sub-packages are configurable via client options. These options are described here: https://godoc.org/google.golang.org/api/option.

## Endpoint Override

Endpoint configuration is used to specify the URL to which requests are sent. It is used for services that support or require regional endpoints, as well as for other use cases such as [testing against fake servers](https://github.com/googleapis/google-cloud-go/blob/main/testing.md#testing-grpc-services-using-fakes).

For example, the Vertex AI service recommends that you configure the endpoint to the location with the features you want that is closest to your physical location or the location of your users. There is no global endpoint for Vertex AI. See [Vertex AI - Locations](https://cloud.google.com/vertex-ai/docs/general/locations) for more details. The following example demonstrates configuring a Vertex AI client with a regional endpoint:

ctx := context.Background()
endpoint := "us-central1-aiplatform.googleapis.com:443"
client, err := aiplatform.NewDatasetClient(ctx, option.WithEndpoint(endpoint))

Authentication and Authorization

All the clients in sub-packages support authentication via Google Application Default Credentials (see https://cloud.google.com/docs/authentication/production), or by providing a JSON key file for a Service Account. See examples below.

Google Application Default Credentials (ADC) is the recommended way to authorize and authenticate clients. For information on how to create and obtain Application Default Credentials, see https://cloud.google.com/docs/authentication/production. Here is an example of a client using ADC to authenticate:

client, err := secretmanager.NewClient(context.Background())
if err != nil {
	// TODO: handle error.
}
_ = client // Use the client.

You can use a file with credentials to authenticate and authorize, such as a JSON key file associated with a Google service account. Service Account keys can be created and downloaded from https://console.cloud.google.com/iam-admin/serviceaccounts. This example uses the Secret Manger client, but the same steps apply to the other client libraries underneath this package. Example:

client, err := secretmanager.NewClient(context.Background(),
	option.WithCredentialsFile("/path/to/service-account-key.json"))
if err != nil {
	// TODO: handle error.
}
_ = client // Use the client.

In some cases (for instance, you don't want to store secrets on disk), you can create credentials from in-memory JSON and use the WithCredentials option. The google package in this example is at golang.org/x/oauth2/google. This example uses the Secret Manager client, but the same steps apply to the other client libraries underneath this package. Note that scopes can be found at https://developers.google.com/identity/protocols/oauth2/scopes, and are also provided in all auto-generated libraries: for example, cloud.google.com/go/secretmanager/apiv1 provides DefaultAuthScopes. Example:

ctx := context.Background()
creds, err := google.CredentialsFromJSON(ctx, []byte("JSON creds"), secretmanager.DefaultAuthScopes()...)
if err != nil {
	// TODO: handle error.
}
client, err := secretmanager.NewClient(ctx, option.WithCredentials(creds))
if err != nil {
	// TODO: handle error.
}
_ = client // Use the client.

Timeouts and Cancellation

By default, non-streaming methods, like Create or Get, will have a default deadline applied to the context provided at call time, unless a context deadline is already set. Streaming methods have no default deadline and will run indefinitely. To set timeouts or arrange for cancellation, use contexts. Transient errors will be retried when correctness allows.

Here is an example of how to set a timeout for an RPC, use context.WithTimeout:

ctx := context.Background()
// Do not set a timeout on the context passed to NewClient: dialing happens
// asynchronously, and the context is used to refresh credentials in the
// background.
client, err := secretmanager.NewClient(ctx)
if err != nil {
	// TODO: handle error.
}
// Time out if it takes more than 10 seconds to create a dataset.
tctx, cancel := context.WithTimeout(ctx, 10*time.Second)
defer cancel() // Always call cancel.

req := &secretmanagerpb.DeleteSecretRequest{Name: "projects/project-id/secrets/name"}
if err := client.DeleteSecret(tctx, req); err != nil {
	// TODO: handle error.
}

Here is an example of how to arrange for an RPC to be canceled, use context.WithCancel:

ctx := context.Background()
// Do not cancel the context passed to NewClient: dialing happens asynchronously,
// and the context is used to refresh credentials in the background.
client, err := secretmanager.NewClient(ctx)
if err != nil {
	// TODO: handle error.
}
cctx, cancel := context.WithCancel(ctx)
defer cancel() // Always call cancel.

// TODO: Make the cancel function available to whatever might want to cancel the
// call--perhaps a GUI button.
req := &secretmanagerpb.DeleteSecretRequest{Name: "projects/proj/secrets/name"}
if err := client.DeleteSecret(cctx, req); err != nil {
	// TODO: handle error.
}

To opt out of default deadlines, set the temporary environment variable GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE to "true" prior to client creation. This affects all Google Cloud Go client libraries. This opt-out mechanism will be removed in a future release. File an issue at https://github.com/googleapis/google-cloud-go if the default deadlines cannot work for you.

Do not attempt to control the initial connection (dialing) of a service by setting a timeout on the context passed to NewClient. Dialing is non-blocking, so timeouts would be ineffective and would only interfere with credential refreshing, which uses the same context.

Connection Pooling

Connection pooling differs in clients based on their transport. Cloud clients either rely on HTTP or gRPC transports to communicate with Google Cloud.

Cloud clients that use HTTP (bigquery, compute, storage, and translate) rely on the underlying HTTP transport to cache connections for later re-use. These are cached to the default http.MaxIdleConns and http.MaxIdleConnsPerHost settings in http.DefaultTransport.

For gRPC clients (all others in this repo), connection pooling is configurable. Users of cloud client libraries may specify option.WithGRPCConnectionPool(n) as a client option to NewClient calls. This configures the underlying gRPC connections to be pooled and addressed in a round robin fashion.

Using the Libraries with Docker

Minimal docker images like Alpine lack CA certificates. This causes RPCs to appear to hang, because gRPC retries indefinitely. See https://github.com/googleapis/google-cloud-go/issues/928 for more information.

Debugging

To see gRPC logs, set the environment variable GRPC_GO_LOG_SEVERITY_LEVEL. See https://godoc.org/google.golang.org/grpc/grpclog for more information.

For HTTP logging, set the GODEBUG environment variable to "http2debug=1" or "http2debug=2".

Inspecting errors

Most of the errors returned by the generated clients are wrapped in an github.com/googleapis/gax-go/v2/apierror.APIError and can be further unwrapped into a google.golang.org/grpc/status.Status or google.golang.org/api/googleapi.Error depending on the transport used to make the call (gRPC or REST). Converting your errors to these types can be a useful way to get more information about what went wrong while debugging.

github.com/googleapis/gax-go/v2/apierror.APIError gives access to specific details in the error. The transport-specific errors can still be unwrapped using the github.com/googleapis/gax-go/v2/apierror.APIError.

if err != nil {
   var ae *apierror.APIError
   if errors.As(err, &ae) {
      log.Println(ae.Reason())
      log.Println(ae.Details().Help.GetLinks())
   }
}

If the gRPC transport was used, the google.golang.org/grpc/status.Status can still be parsed using the google.golang.org/grpc/status.FromError function.

if err != nil {
   if s, ok := status.FromError(err); ok {
      log.Println(s.Message())
      for _, d := range s.Proto().Details {
         log.Println(d)
      }
   }
}

If the REST transport was used, the google.golang.org/api/googleapi.Error can be parsed in a similar way, allowing access to details such as the HTTP response code.

if err != nil {
   var gerr *googleapi.Error
   if errors.As(err, &gerr) {
      log.Println(gerr.Message)
   }
}

Client Stability

Clients in this repository are considered alpha or beta unless otherwise marked as stable in the README.md. Semver is not used to communicate stability of clients.

Alpha and beta clients may change or go away without notice.

Clients marked stable will maintain compatibility with future versions for as long as we can reasonably sustain. Incompatible changes might be made in some situations, including:

- Security bugs may prompt backwards-incompatible changes.

- Situations in which components are no longer feasible to maintain without making breaking changes, including removal.

- Parts of the client surface may be outright unstable and subject to change. These parts of the surface will be labeled with the note, "It is EXPERIMENTAL and subject to change or removal without notice."

Source Files

Directories

Path Synopsis
aiplatform module
alloydbconn module
analytics module
apigateway module
apikeys module
appengine module
area120 module
asset module
automl module
batch module
beyondcorp module
bigquery module
bigtable module
billing module
cbt module
channel module
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.
cloudbuild module
clouddms module
cloudsqlconn module
cloudtasks module
cmd
go-cloud-debug-agent
Deprecated.
Deprecated.
compute module
metadata Module
container module
datacatalog module
dataflow module
dataform module
datafusion module
datalabeling module
dataplex module
dataproc module
dataqna module
datastore module
datastream module
debugger
apiv2
Package debugger is an auto-generated package for the Stackdriver Debugger API.
Package debugger is an auto-generated package for the Stackdriver Debugger API.
deploy module
dialogflow module
dlp module
documentai module
domains module
eventarc module
filestore module
firestore module
functions module
gaming module
gkebackup module
gkeconnect module
gkehub module
grafeas module
gsuiteaddons module
Package httpreplay provides an API for recording and replaying traffic from HTTP-based Google API clients.
Package httpreplay provides an API for recording and replaying traffic from HTTP-based Google API clients.
iam module
iap module
ids module
iot module
kms module
language module
lifesciences module
logging module
longrunning module
maps module
memcache module
metastore module
monitoring module
notebooks module
optimization module
orgpolicy module
osconfig module
oslogin module
profiler module
pubsub module
pubsublite module
recommender module
redis module
retail module
Package rpcreplay supports the capture and replay of gRPC calls.
Package rpcreplay supports the capture and replay of gRPC calls.
run module
scheduler module
security module
serviceusage module
shell module
spanner module
speech module
storage module
talent module
texttospeech module
third_party
pkgsite
Package pkgsite is not for external use.
Package pkgsite is not for external use.
tpu module
trace module
translate module
video module
vision module
vmmigration module
vpcaccess module
webrisk module
workflows module
btree
Package btree implements in-memory B-Trees of arbitrary degree.
Package btree implements in-memory B-Trees of arbitrary degree.
detect
Package detect is used find information from the environment.
Package detect is used find information from the environment.
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.
leakcheck
Package leakcheck contains functions to check leaked goroutines.
Package leakcheck contains functions to check leaked goroutines.
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.
protostruct
Package protostruct supports operations on the protocol buffer Struct message.
Package protostruct supports operations on the protocol buffer Struct message.
testutil
Package testutil contains helper functions for writing tests.
Package testutil contains helper functions for writing tests.
tracecontext
Package tracecontext provides encoders and decoders for Stackdriver Trace contexts.
Package tracecontext provides encoders and decoders for Stackdriver Trace contexts.
uid
Package uid supports generating unique IDs.
Package uid supports generating unique IDs.
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.
aliasfix Module
aliasgen Module
examples/fake Module
examples/mock Module
gapicgen Module
godocfx Module

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