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peerclient.go
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peerclient.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package common
import (
"context"
"crypto/tls"
"io/ioutil"
"time"
pb "github.com/hyperledger/fabric-protos-go/peer"
"github.com/hyperledger/fabric/core/comm"
"github.com/hyperledger/fabric/core/config"
"github.com/pkg/errors"
"github.com/spf13/viper"
)
// PeerClient represents a client for communicating with a peer
type PeerClient struct {
CommonClient
}
// NewPeerClientFromEnv creates an instance of a PeerClient from the global
// Viper instance
func NewPeerClientFromEnv() (*PeerClient, error) {
address, override, clientConfig, err := configFromEnv("peer")
if err != nil {
return nil, errors.WithMessage(err, "failed to load config for PeerClient")
}
return newPeerClientForClientConfig(address, override, clientConfig)
}
// NewPeerClientForAddress creates an instance of a PeerClient using the
// provided peer address and, if TLS is enabled, the TLS root cert file
func NewPeerClientForAddress(address, tlsRootCertFile string) (*PeerClient, error) {
if address == "" {
return nil, errors.New("peer address must be set")
}
override := viper.GetString("peer.tls.serverhostoverride")
clientConfig := comm.ClientConfig{}
clientConfig.Timeout = viper.GetDuration("peer.client.connTimeout")
if clientConfig.Timeout == time.Duration(0) {
clientConfig.Timeout = defaultConnTimeout
}
secOpts := comm.SecureOptions{
UseTLS: viper.GetBool("peer.tls.enabled"),
RequireClientCert: viper.GetBool("peer.tls.clientAuthRequired"),
}
if secOpts.RequireClientCert {
keyPEM, err := ioutil.ReadFile(config.GetPath("peer.tls.clientKey.file"))
if err != nil {
return nil, errors.WithMessage(err, "unable to load peer.tls.clientKey.file")
}
secOpts.Key = keyPEM
certPEM, err := ioutil.ReadFile(config.GetPath("peer.tls.clientCert.file"))
if err != nil {
return nil, errors.WithMessage(err, "unable to load peer.tls.clientCert.file")
}
secOpts.Certificate = certPEM
}
clientConfig.SecOpts = secOpts
if clientConfig.SecOpts.UseTLS {
if tlsRootCertFile == "" {
return nil, errors.New("tls root cert file must be set")
}
caPEM, res := ioutil.ReadFile(tlsRootCertFile)
if res != nil {
return nil, errors.WithMessagef(res, "unable to load TLS root cert file from %s", tlsRootCertFile)
}
clientConfig.SecOpts.ServerRootCAs = [][]byte{caPEM}
}
return newPeerClientForClientConfig(address, override, clientConfig)
}
func newPeerClientForClientConfig(address, override string, clientConfig comm.ClientConfig) (*PeerClient, error) {
gClient, err := comm.NewGRPCClient(clientConfig)
if err != nil {
return nil, errors.WithMessage(err, "failed to create PeerClient from config")
}
pClient := &PeerClient{
CommonClient: CommonClient{
GRPCClient: gClient,
Address: address,
sn: override}}
return pClient, nil
}
// Endorser returns a client for the Endorser service
func (pc *PeerClient) Endorser() (pb.EndorserClient, error) {
conn, err := pc.CommonClient.NewConnection(pc.Address, comm.ServerNameOverride(pc.sn))
if err != nil {
return nil, errors.WithMessagef(err, "endorser client failed to connect to %s", pc.Address)
}
return pb.NewEndorserClient(conn), nil
}
// Deliver returns a client for the Deliver service
func (pc *PeerClient) Deliver() (pb.Deliver_DeliverClient, error) {
conn, err := pc.CommonClient.NewConnection(pc.Address, comm.ServerNameOverride(pc.sn))
if err != nil {
return nil, errors.WithMessagef(err, "deliver client failed to connect to %s", pc.Address)
}
return pb.NewDeliverClient(conn).Deliver(context.TODO())
}
// PeerDeliver returns a client for the Deliver service for peer-specific use
// cases (i.e. DeliverFiltered)
func (pc *PeerClient) PeerDeliver() (pb.DeliverClient, error) {
conn, err := pc.CommonClient.NewConnection(pc.Address, comm.ServerNameOverride(pc.sn))
if err != nil {
return nil, errors.WithMessagef(err, "deliver client failed to connect to %s", pc.Address)
}
return pb.NewDeliverClient(conn), nil
}
// Certificate returns the TLS client certificate (if available)
func (pc *PeerClient) Certificate() tls.Certificate {
return pc.CommonClient.Certificate()
}
// GetEndorserClient returns a new endorser client. If the both the address and
// tlsRootCertFile are not provided, the target values for the client are taken
// from the configuration settings for "peer.address" and
// "peer.tls.rootcert.file"
func GetEndorserClient(address, tlsRootCertFile string) (pb.EndorserClient, error) {
var peerClient *PeerClient
var err error
if address != "" {
peerClient, err = NewPeerClientForAddress(address, tlsRootCertFile)
} else {
peerClient, err = NewPeerClientFromEnv()
}
if err != nil {
return nil, err
}
return peerClient.Endorser()
}
// GetCertificate returns the client's TLS certificate
func GetCertificate() (tls.Certificate, error) {
peerClient, err := NewPeerClientFromEnv()
if err != nil {
return tls.Certificate{}, err
}
return peerClient.Certificate(), nil
}
// GetDeliverClient returns a new deliver client. If both the address and
// tlsRootCertFile are not provided, the target values for the client are taken
// from the configuration settings for "peer.address" and
// "peer.tls.rootcert.file"
func GetDeliverClient(address, tlsRootCertFile string) (pb.Deliver_DeliverClient, error) {
var peerClient *PeerClient
var err error
if address != "" {
peerClient, err = NewPeerClientForAddress(address, tlsRootCertFile)
} else {
peerClient, err = NewPeerClientFromEnv()
}
if err != nil {
return nil, err
}
return peerClient.Deliver()
}
// GetPeerDeliverClient returns a new deliver client. If both the address and
// tlsRootCertFile are not provided, the target values for the client are taken
// from the configuration settings for "peer.address" and
// "peer.tls.rootcert.file"
func GetPeerDeliverClient(address, tlsRootCertFile string) (pb.DeliverClient, error) {
var peerClient *PeerClient
var err error
if address != "" {
peerClient, err = NewPeerClientForAddress(address, tlsRootCertFile)
} else {
peerClient, err = NewPeerClientFromEnv()
}
if err != nil {
return nil, err
}
return peerClient.PeerDeliver()
}