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protocol.go
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protocol.go
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// Copyright 2017 Istio Authors
//
// 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 protocol defines the interface of CA client protocol. Currently we only support gRPC
// protocol sent to Istio CA server.
package protocol
import (
"fmt"
"golang.org/x/net/context"
"google.golang.org/grpc"
//"istio.io/istio/pkg/log"
pb "istio.io/istio/security/proto"
)
// CAProtocol is the interface for talking to CA.
type CAProtocol interface {
// SendCSR send CSR request to the CA server.
SendCSR(*pb.CsrRequest) (*pb.CsrResponse, error)
}
// GrpcConnection implements CAProtocol talking to CA via gRPC.
// TODO(incfly): investigate the overhead of maintaining gRPC connection for CA server compared with
// establishing new connection every time.
type GrpcConnection struct {
connection *grpc.ClientConn
}
// NewGrpcConnection creates a gRPC connection.
func NewGrpcConnection(caAddr string, dialOptions []grpc.DialOption) (*GrpcConnection, error) {
if caAddr == "" {
return nil, fmt.Errorf("istio CA address is empty")
}
conn, err := grpc.Dial(caAddr, dialOptions...)
if err != nil {
return nil, fmt.Errorf("failed to dial %s: %v", caAddr, err)
}
return &GrpcConnection{
connection: conn,
}, nil
}
// SendCSR sends a resquest to CA server and returns the response.
func (c *GrpcConnection) SendCSR(req *pb.CsrRequest) (*pb.CsrResponse, error) {
client := pb.NewIstioCAServiceClient(c.connection)
return client.HandleCSR(context.Background(), req)
}
// Close closes the gRPC connection.
func (c *GrpcConnection) Close() error {
return c.connection.Close()
}