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server.go
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server.go
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/*
Copyright Rockontrol Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package rksync
import (
"crypto/x509"
"encoding/hex"
"encoding/pem"
"io/ioutil"
"net"
"os"
"path/filepath"
"regexp"
"github.com/gogo/protobuf/proto"
"github.com/pkg/errors"
"github.com/rkcloudchain/rksync/channel"
"github.com/rkcloudchain/rksync/common"
"github.com/rkcloudchain/rksync/config"
"github.com/rkcloudchain/rksync/gossip"
"github.com/rkcloudchain/rksync/logging"
"github.com/rkcloudchain/rksync/protos"
"github.com/rkcloudchain/rksync/server"
"github.com/rkcloudchain/rksync/util"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
)
var (
channelAllowedChars = "[a-z][a-z0-9.-]*"
maxLength = 249
)
// Serve creates a rksync service instance
func Serve(l net.Listener, cfg *config.Config) (*Server, error) {
if cfg.HomeDir == "" {
cfg.HomeDir = config.DefaultHomeDir
}
if cfg.Gossip == nil {
return nil, errors.New("Gossip configuration cannot be nil")
}
if cfg.Identity == nil {
return nil, errors.New("Identity configuration cannot be nil")
}
err := validateGossipConfig(cfg.Gossip)
if err != nil {
return nil, err
}
srv := &Server{cfg: cfg}
srv.chainFilePath = filepath.Join(srv.cfg.HomeDir, "channels")
if s, err := os.Stat(srv.chainFilePath); err != nil {
if os.IsNotExist(err) {
if err := os.MkdirAll(srv.chainFilePath, 0755); err != nil {
return nil, errors.Errorf("Could not create chain file path: %s", err)
}
} else {
return nil, errors.Errorf("Could not stat chain file path: %s", err)
}
} else if !s.IsDir() {
return nil, errors.Errorf("RKSync chain file path exists but not a dir: %s", srv.chainFilePath)
}
if srv.cfg.Server == nil {
srv.cfg.Server = &config.ServerConfig{
SecOpts: &config.TLSConfig{},
KaOpts: &config.KeepaliveConfig{},
}
}
if cfg.Server.SecOpts.UseTLS {
srv.clientCreds, err = clientTransportCredentials(srv.cfg)
if err != nil {
return nil, errors.Errorf("Failed to set TLS client certificate (%s)", err)
}
}
srv.selfIdentity, err = serializeIdentity(cfg.Identity, cfg.HomeDir)
if err != nil {
return nil, errors.Errorf("Failed serializing self identity: %v", err)
}
grpcServer, err := server.NewGRPCServerFromListener(l, srv.cfg.Server)
if err != nil {
logging.Errorf("Failed to create grpc server (%s)", err)
return nil, err
}
srv.gossip, err = gossip.NewGossipService(srv.cfg.Gossip, srv.cfg.Identity, grpcServer.Server(), srv.selfIdentity, func() []grpc.DialOption {
return srv.secureDialOpts(srv.cfg.Server)
})
if err != nil {
return nil, errors.Errorf("Failed creating RKSync service (%s)", err)
}
go func() {
if err := grpcServer.Start(); err != nil {
logging.Errorf("grpc server exited with error: %s", err)
}
}()
go srv.initializeChannel()
return srv, nil
}
// Server encapsulates rksync component
type Server struct {
gossip gossip.Gossip
cfg *config.Config
chainFilePath string
selfIdentity common.PeerIdentityType
clientCreds credentials.TransportCredentials
}
// Stop the rksync service
func (srv *Server) Stop() {
if srv.gossip != nil {
srv.gossip.Stop()
logging.Infof("RKSync %s server exited", srv.cfg.Identity.ID)
}
}
// CreateChannel creates a channel
func (srv *Server) CreateChannel(chainID string, files []*common.FileSyncInfo) error {
logging.Debugf("Creating channel, ID: %s", chainID)
if err := validateChannelID(chainID); err != nil {
return errors.Errorf("Bad channel id: %s", err)
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
chainState, err := srv.gossip.CreateChain(mac, chainID, files)
if err != nil {
return err
}
err = srv.rewriteChainConfigFile(mac, chainState)
if err != nil {
srv.gossip.CloseChain(mac, false)
return err
}
return nil
}
// CloseChannel closes an channel
func (srv *Server) CloseChannel(chainID string) error {
if chainID == "" {
return errors.New("Channel ID must be provided")
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
err := srv.gossip.CloseChain(mac, true)
if err != nil {
return err
}
dir := filepath.Join(srv.chainFilePath, mac.String())
return os.RemoveAll(dir)
}
// AddMemberToChan adds a member to the channel
func (srv *Server) AddMemberToChan(chainID string, nodeID string, cert *x509.Certificate) error {
if chainID == "" {
return errors.New("Channel ID must be provided")
}
if nodeID == "" {
return errors.New("Node ID must be provided")
}
if cert == nil {
return errors.New("Node certificate must be provided")
}
pkiID, err := srv.gossip.GetPKIidOfCert(nodeID, cert)
if err != nil {
return err
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
chainState, err := srv.gossip.AddMemberToChain(mac, pkiID)
if err != nil {
return err
}
return srv.rewriteChainConfigFile(mac, chainState)
}
// RemoveMemberWithChan removes member contained in the channel
func (srv *Server) RemoveMemberWithChan(chainID string, nodeID string, cert *x509.Certificate) error {
if chainID == "" {
return errors.New("Channel ID must be provided")
}
if nodeID == "" {
return errors.New("Node ID must be provided")
}
if cert == nil {
return errors.New("Node certificate must be provided")
}
pkiID, err := srv.gossip.GetPKIidOfCert(nodeID, cert)
if err != nil {
return err
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
chainState, err := srv.gossip.RemoveMemberWithChain(mac, pkiID)
if err != nil {
return err
}
return srv.rewriteChainConfigFile(mac, chainState)
}
// AddFileToChan adds a file to the channel
func (srv *Server) AddFileToChan(chainID string, files []*common.FileSyncInfo) error {
if chainID == "" {
return errors.New("Channel ID must be provided")
}
if len(files) == 0 {
return errors.New("files can't be nil or empty")
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
chainState, err := srv.gossip.AddFileToChain(mac, files)
if err != nil {
return err
}
return srv.rewriteChainConfigFile(mac, chainState)
}
// RemoveFileWithChan removes file contained in the channel
func (srv *Server) RemoveFileWithChan(chainID string, filenames []string) error {
if chainID == "" {
return errors.New("Channel ID must be provided")
}
if len(filenames) == 0 {
return errors.New("files can't be nil or empty")
}
mac := channel.GenerateMAC(srv.gossip.SelfPKIid(), chainID)
chainState, err := srv.gossip.RemoveFileWithChain(mac, filenames)
if err != nil {
return err
}
return srv.rewriteChainConfigFile(mac, chainState)
}
func (srv *Server) initializeChannel() {
dirs, err := util.ListSubdirs(srv.chainFilePath)
if err != nil {
logging.Error(err.Error())
return
}
for _, dir := range dirs {
path := filepath.Join(srv.chainFilePath, dir, "config.pb")
if _, err := os.Stat(path); err != nil {
logging.Errorf("Error reading channel %s config file: %s", dir, err)
continue
}
csBytes, err := ioutil.ReadFile(path)
if err != nil {
logging.Errorf("Error reading channel %s config file: %s", dir, err)
continue
}
chainState := &protos.ChainState{}
err = proto.Unmarshal(csBytes, chainState)
if err != nil {
logging.Errorf("Error unmarshalling channel %s state message: %s", dir, err)
continue
}
mac, err := hex.DecodeString(dir)
if err != nil {
logging.Errorf("Error decoding directory string: %s", err)
continue
}
err = srv.gossip.InitializeChain(common.ChainMac(mac), chainState)
if err != nil {
logging.Errorf("Error initializing channel %s: %s", dir, err)
}
}
}
func (srv *Server) rewriteChainConfigFile(chainMac common.ChainMac, chainState *protos.ChainState) error {
dir := filepath.Join(srv.chainFilePath, chainMac.String())
if _, err := os.Stat(dir); os.IsNotExist(err) {
err = os.MkdirAll(dir, 0755)
if err != nil {
return errors.Wrapf(err, "Create directory %s failed: %s", dir, err)
}
}
csBytes, err := proto.Marshal(chainState)
if err != nil {
return err
}
filename := filepath.Join(dir, "config.pb")
fi, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
return err
}
defer fi.Close()
n, err := fi.Write(csBytes)
if err != nil || n < 1 {
return errors.Errorf("Rewrite channel config file failed: %s", err)
}
return nil
}
func (srv *Server) secureDialOpts(cfg *config.ServerConfig) []grpc.DialOption {
var dialOpts []grpc.DialOption
dialOpts = append(dialOpts, grpc.WithDefaultCallOptions(
grpc.MaxCallRecvMsgSize(config.MaxRecvMsgSize),
grpc.MaxCallSendMsgSize(config.MaxSendMsgSize),
))
dialOpts = append(dialOpts, config.ClientKeepaliveOptions(cfg.KaOpts)...)
if cfg.SecOpts.UseTLS {
dialOpts = append(dialOpts, grpc.WithTransportCredentials(srv.clientCreds))
} else {
dialOpts = append(dialOpts, grpc.WithInsecure())
}
return dialOpts
}
func serializeIdentity(cfg *config.IdentityConfig, homedir string) (common.PeerIdentityType, error) {
if cfg.ID == "" {
return nil, errors.New("Node id must be provided")
}
if err := cfg.MakeFilesAbs(homedir); err != nil {
return nil, errors.Wrap(err, "Failed to make identity file absolute")
}
cert, err := util.GetX509CertificateFromPEM(cfg.GetCertificate())
if err != nil {
return nil, err
}
pb := &pem.Block{Bytes: cert.Raw, Type: "CERTIFICATE"}
pemBytes := pem.EncodeToMemory(pb)
if pemBytes == nil {
return nil, errors.New("Encoding of identity failed")
}
sID := &protos.SerializedIdentity{NodeId: cfg.ID, IdBytes: pemBytes}
idBytes, err := proto.Marshal(sID)
if err != nil {
return nil, errors.Wrapf(err, "could not marshal a SerializedIdentity structure for identity %v", sID)
}
return idBytes, nil
}
func validateChannelID(chainID string) error {
re, _ := regexp.Compile(channelAllowedChars)
if len(chainID) <= 0 {
return errors.New("Channel ID illegal, cannot be empty")
}
if len(chainID) > maxLength {
return errors.Errorf("Channel ID illegal, cannot be longer than %d", maxLength)
}
matched := re.FindString(chainID)
if len(matched) != len(chainID) {
return errors.Errorf("Channel ID %s contains illegal characters", chainID)
}
return nil
}