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110 lines
4.3 KiB
Go
110 lines
4.3 KiB
Go
// Copyright 2014 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/*
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Package cloud is the root of the packages used to access Google Cloud
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Services. See https://godoc.org/cloud.google.com/go for a full list
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of sub-packages.
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Client Options
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All clients in sub-packages are configurable via client options. These options are
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described here: https://godoc.org/google.golang.org/api/option.
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Authentication and Authorization
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All the clients in sub-packages support authentication via Google Application Default
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Credentials (see https://cloud.google.com/docs/authentication/production), or
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by providing a JSON key file for a Service Account. See the authentication examples
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in this package for details.
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Timeouts and Cancellation
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By default, non-streaming methods, like Create or Get, will have a default deadline applied to the
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context provided at call time, unless a context deadline is already set. Streaming
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methods have no default deadline and will run indefinitely. To set timeouts or
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arrange for cancellation, use contexts. See the examples for details. Transient
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errors will be retried when correctness allows.
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To opt out of default deadlines, set the temporary environment variable
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GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE to "true" prior to client
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creation. This affects all Google Cloud Go client libraries. This opt-out
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mechanism will be removed in a future release. File an issue at
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https://github.com/googleapis/google-cloud-go if the default deadlines
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cannot work for you.
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Do not attempt to control the initial connection (dialing) of a service by setting a
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timeout on the context passed to NewClient. Dialing is non-blocking, so timeouts
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would be ineffective and would only interfere with credential refreshing, which uses
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the same context.
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Connection Pooling
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Connection pooling differs in clients based on their transport. Cloud
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clients either rely on HTTP or gRPC transports to communicate
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with Google Cloud.
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Cloud clients that use HTTP (bigquery, compute, storage, and translate) rely on the
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underlying HTTP transport to cache connections for later re-use. These are cached to
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the default http.MaxIdleConns and http.MaxIdleConnsPerHost settings in
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http.DefaultTransport.
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For gRPC clients (all others in this repo), connection pooling is configurable. Users
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of cloud client libraries may specify option.WithGRPCConnectionPool(n) as a client
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option to NewClient calls. This configures the underlying gRPC connections to be
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pooled and addressed in a round robin fashion.
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Using the Libraries with Docker
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Minimal docker images like Alpine lack CA certificates. This causes RPCs to appear to
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hang, because gRPC retries indefinitely. See https://github.com/googleapis/google-cloud-go/issues/928
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for more information.
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Debugging
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To see gRPC logs, set the environment variable GRPC_GO_LOG_SEVERITY_LEVEL. See
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https://godoc.org/google.golang.org/grpc/grpclog for more information.
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For HTTP logging, set the GODEBUG environment variable to "http2debug=1" or "http2debug=2".
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Client Stability
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Clients in this repository are considered alpha or beta unless otherwise
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marked as stable in the README.md. Semver is not used to communicate stability
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of clients.
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Alpha and beta clients may change or go away without notice.
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Clients marked stable will maintain compatibility with future versions for as
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long as we can reasonably sustain. Incompatible changes might be made in some
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situations, including:
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- Security bugs may prompt backwards-incompatible changes.
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- Situations in which components are no longer feasible to maintain without
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making breaking changes, including removal.
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- Parts of the client surface may be outright unstable and subject to change.
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These parts of the surface will be labeled with the note, "It is EXPERIMENTAL
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and subject to change or removal without notice."
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*/
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package cloud // import "cloud.google.com/go"
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