d6e6b7e373
Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>
418 lines
10 KiB
Go
418 lines
10 KiB
Go
/*
|
|
Copyright 2019 Stellar Project
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in the
|
|
Software without restriction, including without limitation the rights to use, copy,
|
|
modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
|
|
and to permit persons to whom the Software is furnished to do so, subject to the
|
|
following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all copies
|
|
or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
|
|
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
|
|
PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
|
|
FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
|
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
|
|
USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
package server
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net/url"
|
|
"sort"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/gogo/protobuf/proto"
|
|
"github.com/gomodule/redigo/redis"
|
|
"github.com/pkg/errors"
|
|
"github.com/sirupsen/logrus"
|
|
v1 "github.com/stellarproject/heimdall/api/v1"
|
|
)
|
|
|
|
// Nodes returns a list of known nodes
|
|
func (s *Server) Nodes(ctx context.Context, req *v1.NodesRequest) (*v1.NodesResponse, error) {
|
|
nodes, err := s.getNodes(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &v1.NodesResponse{
|
|
Nodes: nodes,
|
|
}, nil
|
|
}
|
|
|
|
func (s *Server) getNodes(ctx context.Context) ([]*v1.Node, error) {
|
|
nodeKeys, err := redis.Strings(s.local(ctx, "KEYS", s.getNodeKey("*")))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var nodes []*v1.Node
|
|
for _, nodeKey := range nodeKeys {
|
|
data, err := redis.Bytes(s.local(ctx, "GET", nodeKey))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var node v1.Node
|
|
if err := proto.Unmarshal(data, &node); err != nil {
|
|
return nil, err
|
|
}
|
|
nodes = append(nodes, &node)
|
|
}
|
|
return nodes, nil
|
|
}
|
|
|
|
func (s *Server) getNode(ctx context.Context, id string) (*v1.Node, error) {
|
|
data, err := redis.Bytes(s.local(ctx, "GET", s.getNodeKey(id)))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var node v1.Node
|
|
if err := proto.Unmarshal(data, &node); err != nil {
|
|
return nil, err
|
|
}
|
|
return &node, nil
|
|
}
|
|
|
|
func (s *Server) configureNode() error {
|
|
ctx := context.Background()
|
|
nodes, err := s.getNodes(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// attempt to connect to existing
|
|
if len(nodes) > 0 {
|
|
for _, node := range nodes {
|
|
// ignore self
|
|
if node.ID == s.cfg.ID {
|
|
continue
|
|
}
|
|
|
|
logrus.Infof("attempting to join existing node %s", node.Addr)
|
|
c, err := s.getClient(node.Addr)
|
|
if err != nil {
|
|
logrus.Warn(err)
|
|
continue
|
|
}
|
|
r, err := c.Join(&v1.JoinRequest{
|
|
ID: s.cfg.ID,
|
|
ClusterKey: s.cfg.ClusterKey,
|
|
GRPCAddress: s.cfg.GRPCAddress,
|
|
EndpointIP: s.cfg.EndpointIP,
|
|
EndpointPort: uint64(s.cfg.EndpointPort),
|
|
InterfaceName: s.cfg.InterfaceName,
|
|
})
|
|
if err != nil {
|
|
c.Close()
|
|
logrus.Warn(err)
|
|
continue
|
|
}
|
|
|
|
// start tunnel
|
|
if err := s.updatePeerConfig(ctx, r.Node, r.Peers); err != nil {
|
|
return err
|
|
}
|
|
// wait for tunnel to come up
|
|
logrus.Infof("waiting for master %s", r.Master.ID)
|
|
if err := s.waitForMaster(ctx, r.Master); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := s.joinMaster(r.Master); err != nil {
|
|
c.Close()
|
|
logrus.Warn(err)
|
|
continue
|
|
}
|
|
|
|
logrus.Infof("waiting for redis sync with %s", r.Master.ID)
|
|
if err := s.waitForRedisSync(ctx); err != nil {
|
|
return err
|
|
}
|
|
|
|
go s.replicaMonitor()
|
|
|
|
return nil
|
|
}
|
|
}
|
|
|
|
data, err := redis.Bytes(s.local(context.Background(), "GET", masterKey))
|
|
if err != nil {
|
|
if err != redis.ErrNil {
|
|
return err
|
|
}
|
|
logrus.Infof("starting as master id=%s", s.cfg.ID)
|
|
if _, err := s.local(context.Background(), "REPLICAOF", "NO", "ONE"); err != nil {
|
|
return err
|
|
}
|
|
|
|
// start server heartbeat
|
|
logrus.Debug("starting master heartbeat")
|
|
go s.masterHeartbeat()
|
|
|
|
// reset replica settings when promoting to master
|
|
logrus.Debug("disabling replica status")
|
|
s.disableReplica()
|
|
|
|
return nil
|
|
}
|
|
|
|
var master v1.Master
|
|
if err := proto.Unmarshal(data, &master); err != nil {
|
|
return err
|
|
}
|
|
|
|
// TODO: start tunnel
|
|
|
|
if err := s.joinMaster(&master); err != nil {
|
|
return err
|
|
}
|
|
|
|
go s.replicaMonitor()
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) disableReplica() error {
|
|
p, err := getPool(s.cfg.RedisURL)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
s.wpool = p
|
|
|
|
// signal replica monitor to stop if started as a peer
|
|
close(s.replicaCh)
|
|
|
|
// unset peer
|
|
s.cfg.GRPCPeerAddress = ""
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) replicaMonitor() {
|
|
logrus.Debugf("starting replica monitor: ttl=%s", masterHeartbeatInterval)
|
|
s.replicaCh = make(chan struct{}, 1)
|
|
t := time.NewTicker(masterHeartbeatInterval)
|
|
go func() {
|
|
for range t.C {
|
|
if _, err := redis.Bytes(s.local(context.Background(), "GET", masterKey)); err != nil {
|
|
if err == redis.ErrNil {
|
|
// skip configure until new leader election
|
|
n, err := s.getNextMaster(context.Background())
|
|
if err != nil {
|
|
logrus.Error(err)
|
|
continue
|
|
}
|
|
logrus.Debugf("replica monitor: node=%s", n)
|
|
if n == nil || n.ID != s.cfg.ID {
|
|
logrus.Debug("waiting for new master to initialize")
|
|
continue
|
|
}
|
|
logrus.Debugf("replica monitor: configuring node with master %+v", n)
|
|
if err := s.configureNode(); err != nil {
|
|
logrus.Error(err)
|
|
continue
|
|
}
|
|
return
|
|
}
|
|
logrus.Error(err)
|
|
}
|
|
}
|
|
}()
|
|
|
|
<-s.replicaCh
|
|
logrus.Debug("stopping replica monitor")
|
|
t.Stop()
|
|
}
|
|
|
|
func (s *Server) getNextMaster(ctx context.Context) (*v1.Node, error) {
|
|
nodes, err := s.getNodes(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(nodes) == 0 {
|
|
return nil, nil
|
|
}
|
|
sort.SliceStable(nodes, func(i, j int) bool { return nodes[i].Updated.Before(nodes[j].Updated) })
|
|
return nodes[len(nodes)-1], nil
|
|
}
|
|
|
|
func (s *Server) masterHeartbeat() {
|
|
logrus.Debugf("starting master heartbeat: ttl=%s", masterHeartbeatInterval)
|
|
// initial update
|
|
ctx, cancel := context.WithTimeout(context.Background(), masterHeartbeatInterval)
|
|
defer cancel()
|
|
|
|
logrus.Infof("cluster master key=%s", s.cfg.ClusterKey)
|
|
if err := s.updateMasterInfo(ctx); err != nil {
|
|
logrus.Error(err)
|
|
}
|
|
|
|
t := time.NewTicker(masterHeartbeatInterval)
|
|
for range t.C {
|
|
if err := s.updateMasterInfo(ctx); err != nil {
|
|
logrus.Error(err)
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Server) joinMaster(m *v1.Master) error {
|
|
// configure replica
|
|
logrus.Infof("configuring node as replica of %+v", m.ID)
|
|
pool, err := getPool(s.cfg.RedisURL)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
conn := pool.Get()
|
|
defer conn.Close()
|
|
|
|
logrus.Debugf("configuring redis as slave of %s", m.ID)
|
|
u, err := url.Parse(m.RedisURL)
|
|
if err != nil {
|
|
return errors.Wrap(err, "error parsing master redis url")
|
|
}
|
|
hostPort := strings.SplitN(u.Host, ":", 2)
|
|
host := hostPort[0]
|
|
port := hostPort[1]
|
|
if _, err := conn.Do("REPLICAOF", host, port); err != nil {
|
|
return err
|
|
}
|
|
|
|
s.wpool, err = getPool(m.RedisURL)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) updateMasterInfo(ctx context.Context) error {
|
|
// update master info
|
|
if _, err := s.master(ctx, "SET", clusterKey, s.cfg.ClusterKey); err != nil {
|
|
logrus.Error("updateMasterInfo.setClusterKey")
|
|
return err
|
|
}
|
|
// build redis url with gateway ip
|
|
gatewayIP, _, err := s.getNodeIP(ctx, s.cfg.ID)
|
|
if err != nil {
|
|
logrus.Error("updateMasterInfo.getNodeIP")
|
|
return err
|
|
}
|
|
u, err := url.Parse(s.cfg.RedisURL)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// update master redis url to gateway to serve over wireguard
|
|
u.Host = fmt.Sprintf("%s:%s", gatewayIP.String(), u.Port())
|
|
m := &v1.Master{
|
|
ID: s.cfg.ID,
|
|
GRPCAddress: s.cfg.AdvertiseGRPCAddress,
|
|
RedisURL: u.String(),
|
|
GatewayIP: gatewayIP.String(),
|
|
}
|
|
data, err := proto.Marshal(m)
|
|
if err != nil {
|
|
return errors.Wrap(err, "error marshalling master info")
|
|
}
|
|
|
|
if _, err := s.master(ctx, "SET", masterKey, data); err != nil {
|
|
return errors.Wrap(err, "error setting master info")
|
|
}
|
|
|
|
if _, err := s.master(ctx, "EXPIRE", masterKey, int(masterHeartbeatInterval.Seconds())); err != nil {
|
|
return errors.Wrap(err, "error setting expire for master info")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) updateNodeInfo(ctx context.Context) {
|
|
logrus.Debugf("starting node heartbeat: ttl=%s", nodeHeartbeatInterval)
|
|
t := time.NewTicker(nodeHeartbeatInterval)
|
|
for range t.C {
|
|
if err := s.updateLocalNodeInfo(ctx); err != nil {
|
|
logrus.Error(err)
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Server) updateLocalNodeInfo(ctx context.Context) error {
|
|
key := s.getNodeKey(s.cfg.ID)
|
|
keyPair, err := s.getOrCreateKeyPair(ctx, s.cfg.ID)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error getting keypair for %s", s.cfg.ID)
|
|
}
|
|
nodeIP, _, err := s.getNodeIP(ctx, s.cfg.ID)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "error getting node IP for %s", s.cfg.ID)
|
|
}
|
|
node := &v1.Node{
|
|
Updated: time.Now(),
|
|
ID: s.cfg.ID,
|
|
Addr: s.cfg.GRPCAddress,
|
|
KeyPair: keyPair,
|
|
EndpointIP: s.cfg.EndpointIP,
|
|
EndpointPort: uint64(s.cfg.EndpointPort),
|
|
GatewayIP: nodeIP.String(),
|
|
InterfaceName: s.cfg.InterfaceName,
|
|
}
|
|
|
|
data, err := proto.Marshal(node)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if _, err := s.master(ctx, "SET", key, data); err != nil {
|
|
return err
|
|
}
|
|
|
|
if _, err := s.master(ctx, "EXPIRE", key, nodeHeartbeatExpiry); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) createNode(ctx context.Context, req *v1.JoinRequest) (*v1.Node, error) {
|
|
key := s.getNodeKey(req.ID)
|
|
keyPair, err := s.getOrCreateKeyPair(ctx, req.ID)
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "error getting/creating keypair for %s", req.ID)
|
|
}
|
|
nodeIP, _, err := s.getNodeIP(ctx, req.ID)
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "error getting node ip for %s", req.ID)
|
|
}
|
|
node := &v1.Node{
|
|
Updated: time.Now(),
|
|
ID: req.ID,
|
|
Addr: req.GRPCAddress,
|
|
KeyPair: keyPair,
|
|
EndpointIP: req.EndpointIP,
|
|
EndpointPort: uint64(req.EndpointPort),
|
|
GatewayIP: nodeIP.String(),
|
|
InterfaceName: req.InterfaceName,
|
|
}
|
|
|
|
data, err := proto.Marshal(node)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if _, err := s.master(ctx, "SET", key, data); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if _, err := s.master(ctx, "EXPIRE", key, nodeHeartbeatExpiry); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return node, nil
|
|
}
|