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discovery.go
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discovery.go
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package discovery
import (
"bufio"
"context"
"fmt"
"html/template"
"log"
"math"
"net"
"net/http"
"os"
"strings"
"sync/atomic"
"github.com/ibalajiarun/go-consensus/cmd/master/masterpb"
pb "github.com/ibalajiarun/go-consensus/cmd/master/masterpb"
"github.com/ibalajiarun/go-consensus/peer/peerpb"
"github.com/ibalajiarun/go-consensus/pkg/logger"
"google.golang.org/grpc"
)
type Discovery struct {
*Config
identifier int32
msgC chan packet
lis net.Listener
grpcServer *grpc.Server
logger logger.Logger
regNodes map[peerpb.BasicPeerInfo]peerpb.PeerInfo
resChans []packet
sInfo []peerpb.PeerInfo
clientIDGen uint32
leader peerpb.PeerID
secretKeys []string
publicKeys []string
}
type packetType int
const (
pktRegister packetType = iota + 1
pktRetrieve
)
type packet struct {
id peerpb.BasicPeerInfo
retC chan<- bool
pktType packetType
}
type retPacket struct {
id peerpb.BasicPeerInfo
retC chan<- bool
}
func dieOnError(err error) {
if err != nil {
panic(err)
}
}
func NewDiscoveryServer(portnum int, logger logger.Logger, config *Config) (*Discovery, error) {
logger.Infof("Discovery provider starting on port %d\n", portnum)
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", portnum))
if err != nil {
logger.Errorf("Unble to listen on port %d", portnum)
return nil, err
}
d := &Discovery{
Config: config,
identifier: 0,
msgC: make(chan packet, config.NodeCount),
lis: lis,
grpcServer: grpc.NewServer(),
logger: logger,
regNodes: make(map[peerpb.BasicPeerInfo]peerpb.PeerInfo),
resChans: make([]packet, 0, config.NodeCount),
leader: math.MaxUint64,
}
d.readKeys()
return d, nil
}
func (d *Discovery) Run(ctx context.Context) {
for {
select {
case pkt := <-d.msgC:
switch pkt.pktType {
case pktRegister:
d.processPacket(pkt)
case pktRetrieve:
d.retrieveServiceInfo(pkt)
}
case <-ctx.Done():
return
}
}
}
func (d *Discovery) Serve(ctx context.Context) error {
// go d.startHTTP()
go d.Run(ctx)
pb.RegisterServiceDiscoveryServer(d.grpcServer, d)
defer d.Stop()
return d.grpcServer.Serve(d.lis)
}
func (d *Discovery) Stop() {
d.grpcServer.Stop()
}
func (d *Discovery) readKeys() {
if len(d.KeyFile) <= 0 {
return
}
var skeys []string
var vkeys []string
file, err := os.Open(d.KeyFile)
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
idx := 0
for idx < 4 && scanner.Scan() {
vkey := scanner.Text()
vkeys = append(vkeys, vkey)
idx++
}
// if idx < 4 {
// log.Fatal("too few lines in file")
// }
if err := scanner.Err(); err != nil {
d.logger.Fatal(err)
}
for scanner.Scan() {
skey := scanner.Text()
skeys = append(skeys, skey)
}
if err := scanner.Err(); err != nil {
d.logger.Fatal(err)
}
d.logger.Infof("Read %d secret keys and %d public keys", len(skeys), len(vkeys))
d.secretKeys = skeys
d.publicKeys = vkeys
}
func (m *Discovery) startHTTP() {
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", 8080))
dieOnError(err)
http.Serve(lis, m)
}
func (m *Discovery) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// TODO: Fix prefix
t, err := template.ParseFiles(fmt.Sprintf("%v/index.html", ""))
dieOnError(err)
info := m.sInfo
if info == nil {
info = make([]peerpb.PeerInfo, 0)
}
err = t.Execute(w, info)
dieOnError(err)
}
func prompt() {
fmt.Printf("-> Press Return key to continue.")
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
break
}
if err := scanner.Err(); err != nil {
panic(err)
}
fmt.Println()
}
func (d *Discovery) processPacket(pkt packet) error {
if info, exists := d.regNodes[pkt.id]; exists {
d.logger.Infof("node already registered %v; received %v\n", info, pkt)
return nil
}
rID := peerpb.PeerID(d.identifier)
d.identifier++
if d.leader == math.MaxUint64 && strings.TrimSpace(pkt.id.Region) == d.LeaderRegion {
d.leader = rID
d.logger.Infof("Leader set to %d", rID)
}
// log.Printf("container info %v", container)
nodeInfo := peerpb.PeerInfo{
BasicPeerInfo: pkt.id,
PeerID: rID,
}
d.logger.Infof("registered node %v\n", nodeInfo)
d.regNodes[pkt.id] = nodeInfo
d.resChans = append(d.resChans, pkt)
if d.identifier == d.NodeCount {
d.logger.Infof("registered %v nodes...\n", d.NodeCount)
if d.leader == math.MaxUint64 {
d.logger.Errorf("No leader set. Target Region is %v", d.LeaderRegion)
}
prompt()
nodes := make([]peerpb.PeerInfo, 0, d.NodeCount)
for _, info := range d.regNodes {
nodes = append(nodes, info)
}
d.sInfo = nodes
for _, rpkt := range d.resChans {
rpkt.retC <- true
}
d.resChans = nil
} else if d.identifier > d.NodeCount {
d.logger.Errorf("more nodes registered than expected... %v > %v", d.identifier, d.NodeCount)
}
return nil
}
func (d *Discovery) retrieveServiceInfo(pkt packet) {
if d.identifier == d.NodeCount {
log.Printf("retrieving service info for %v nodes...\n", d.NodeCount)
pkt.retC <- true
} else {
if d.identifier > d.NodeCount {
d.logger.Errorf("more nodes registered than expected... %v > %v", d.identifier, d.NodeCount)
return
}
d.resChans = append(d.resChans, pkt)
}
}
// Register is the grpc handler for registering a service
func (d *Discovery) Register(ctx context.Context, id *peerpb.BasicPeerInfo) (*pb.ServerResponse, error) {
ret := make(chan bool, 1)
d.msgC <- packet{
pktType: pktRegister,
id: *id,
retC: ret,
}
select {
case <-ret:
res := &pb.ServerResponse{
PeerConfig: &peerpb.PeerConfig{
PeerDetails: d.sInfo,
ListenPort: 7000,
LogVerbose: d.ServerConfig.LogVerbose,
Algorithm: d.Algorithm,
MaxFailures: d.MaxFailures,
MaxFastFailures: d.MaxFastFailures,
LeaderID: d.leader,
SecretKeys: d.secretKeys,
PublicKeys: d.publicKeys,
EnclavePath: d.ServerConfig.EnclavePath,
EnclaveBatchSize: d.ServerConfig.EnclaveBatchSize,
DqOBatchSize: d.ServerConfig.DqOBatchSize,
CmdBatchSize: d.ServerConfig.CmdBatchSize,
CmdBatchTimeout: d.ServerConfig.CmdBatchTimeout,
Workers: d.ServerConfig.Workers,
WorkersQueueSizes: d.ServerConfig.WorkersQueueSizes,
RccAlgorithm: d.ServerConfig.RccAlgorithm,
DispelWaitForAllRb: d.ServerConfig.DispelWaitForAllRb,
},
PeerID: d.regNodes[*id].PeerID,
}
return res, nil
case <-ctx.Done():
return nil, ctx.Err()
}
}
func (d *Discovery) GetServiceInfo(ctx context.Context, info *peerpb.BasicPeerInfo) (*pb.ClientResponse, error) {
ret := make(chan bool, 1)
d.msgC <- packet{
pktType: pktRetrieve,
retC: ret,
}
select {
case <-ret:
id := atomic.AddUint32(&d.clientIDGen, 1)
d.logger.Infof("registered client %v", info)
res := &pb.ClientResponse{
Config: &masterpb.ClientConfig{
BaseClientConfig: &d.ClientConfig,
Nodes: d.sInfo,
LeaderID: d.leader,
Algorithm: d.Algorithm,
MaxFailures: d.MaxFailures,
MaxFastFailures: d.MaxFastFailures,
},
ClientId: id,
}
return res, nil
case <-ctx.Done():
return nil, ctx.Err()
}
}