mirror of
https://github.com/coredns/coredns.git
synced 2025-11-03 18:53:13 -05:00
80 lines
3.0 KiB
Go
80 lines
3.0 KiB
Go
|
// Copyright 2014 Google LLC
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
/*
|
||
|
|
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.
|
||
|
|
|
||
|
|
|
||
|
|
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 the authentication examples
|
||
|
|
in this package for details.
|
||
|
|
|
||
|
|
|
||
|
|
Timeouts and Cancellation
|
||
|
|
|
||
|
|
By default, all requests in sub-packages will run indefinitely, retrying on transient
|
||
|
|
errors when correctness allows. To set timeouts or arrange for cancellation, use
|
||
|
|
contexts. See the examples for details.
|
||
|
|
|
||
|
|
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/GoogleCloudPlatform/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".
|
||
|
|
|
||
|
|
*/
|
||
|
|
package cloud // import "cloud.google.com/go"
|