/
connection.go
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/
connection.go
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// Copyright 2019 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
//
// https://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 main
// [START cloudrun_grpc_conn]
// [START run_grpc_conn]
import (
"crypto/tls"
"crypto/x509"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
// NewConn creates a new gRPC connection.
// host should be of the form domain:port, e.g., example.com:443
func NewConn(host string, insecure bool) (*grpc.ClientConn, error) {
var opts []grpc.DialOption
if host != "" {
opts = append(opts, grpc.WithAuthority(host))
}
if insecure {
opts = append(opts, grpc.WithInsecure())
} else {
// Note: On the Windows platform, use of x509.SystemCertPool() requires
// go version 1.18 or higher.
systemRoots, err := x509.SystemCertPool()
if err != nil {
return nil, err
}
cred := credentials.NewTLS(&tls.Config{
RootCAs: systemRoots,
})
opts = append(opts, grpc.WithTransportCredentials(cred))
}
return grpc.Dial(host, opts...)
}
// [END run_grpc_conn]
// [END cloudrun_grpc_conn]