go_study/fabric-main/cmd/common/comm/client.go

62 lines
1.4 KiB
Go

/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package comm
import (
"time"
"github.com/hyperledger/fabric/common/crypto/tlsgen"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/internal/pkg/comm"
"github.com/pkg/errors"
"google.golang.org/grpc"
)
const defaultTimeout = time.Second * 5
// Client deals with TLS connections
// to the discovery server
type Client struct {
config comm.ClientConfig
TLSCertHash []byte
}
// NewClient creates a new comm client out of the given configuration
func NewClient(conf Config) (*Client, error) {
if conf.Timeout == time.Duration(0) {
conf.Timeout = defaultTimeout
}
sop, err := conf.ToSecureOptions(newSelfSignedTLSCert)
if err != nil {
return nil, errors.WithStack(err)
}
cc := comm.ClientConfig{
SecOpts: sop,
DialTimeout: conf.Timeout,
}
return &Client{config: cc, TLSCertHash: util.ComputeSHA256(sop.Certificate)}, nil
}
// NewDialer creates a new dialer from the given endpoint
func (c *Client) NewDialer(endpoint string) func() (*grpc.ClientConn, error) {
return func() (*grpc.ClientConn, error) {
conn, err := c.config.Dial(endpoint)
if err != nil {
return nil, errors.WithStack(err)
}
return conn, nil
}
}
func newSelfSignedTLSCert() (*tlsgen.CertKeyPair, error) {
ca, err := tlsgen.NewCA()
if err != nil {
return nil, err
}
return ca.NewClientCertKeyPair()
}