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server.go
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server.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
// Package server implements server.
package server
import (
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"os"
"sort"
"strings"
"sync"
"time"
"github.com/ava-labs/avalanche-network-runner/local"
"github.com/ava-labs/avalanche-network-runner/network/node"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/gyuho/avax-tester/rpcpb"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/status"
)
type Config struct {
Port string
GwPort string
DialTimeout time.Duration
}
type Server interface {
Run(rootCtx context.Context) error
}
type server struct {
cfg Config
rootCtx context.Context
closeOnce sync.Once
closed chan struct{}
ln net.Listener
gRPCServer *grpc.Server
gRPCRegisterOnce sync.Once
gwMux *runtime.ServeMux
gwServer *http.Server
mu sync.RWMutex
clusterInfo *rpcpb.ClusterInfo
network *localNetwork
rpcpb.UnimplementedPingServiceServer
rpcpb.UnimplementedControlServiceServer
}
var (
ErrNotExists = errors.New("not exists")
ErrInvalidPort = errors.New("invalid port")
ErrClosed = errors.New("server closed")
)
func New(cfg Config) (Server, error) {
if cfg.Port == "" || cfg.GwPort == "" {
return nil, ErrInvalidPort
}
ln, err := net.Listen("tcp", cfg.Port)
if err != nil {
return nil, err
}
gwMux := runtime.NewServeMux()
return &server{
cfg: cfg,
closed: make(chan struct{}),
ln: ln,
gRPCServer: grpc.NewServer(),
gwMux: gwMux,
gwServer: &http.Server{
Addr: cfg.GwPort,
Handler: gwMux,
},
}, nil
}
func (s *server) Run(rootCtx context.Context) (err error) {
s.rootCtx = rootCtx
s.gRPCRegisterOnce.Do(func() {
rpcpb.RegisterPingServiceServer(s.gRPCServer, s)
rpcpb.RegisterControlServiceServer(s.gRPCServer, s)
})
gRPCErrc := make(chan error)
go func() {
zap.L().Info("serving gRPC server", zap.String("port", s.cfg.Port))
gRPCErrc <- s.gRPCServer.Serve(s.ln)
}()
gwErrc := make(chan error)
go func() {
zap.L().Info("dialing gRPC server", zap.String("port", s.cfg.Port))
ctx, cancel := context.WithTimeout(rootCtx, s.cfg.DialTimeout)
gwConn, err := grpc.DialContext(
ctx,
"0.0.0.0"+s.cfg.Port,
grpc.WithBlock(),
grpc.WithTransportCredentials(insecure.NewCredentials()),
)
cancel()
if err != nil {
gwErrc <- err
return
}
defer gwConn.Close()
if err := rpcpb.RegisterPingServiceHandler(rootCtx, s.gwMux, gwConn); err != nil {
gwErrc <- err
return
}
if err := rpcpb.RegisterControlServiceHandler(rootCtx, s.gwMux, gwConn); err != nil {
gwErrc <- err
return
}
zap.L().Info("serving gRPC gateway", zap.String("port", s.cfg.GwPort))
gwErrc <- s.gwServer.ListenAndServe()
}()
select {
case <-rootCtx.Done():
zap.L().Warn("root context is done")
zap.L().Warn("closed gRPC gateway server", zap.Error(s.gwServer.Close()))
<-gwErrc
s.gRPCServer.Stop()
zap.L().Warn("closed gRPC server")
<-gRPCErrc
case err = <-gRPCErrc:
zap.L().Warn("gRPC server failed", zap.Error(err))
zap.L().Warn("closed gRPC gateway server", zap.Error(s.gwServer.Close()))
<-gwErrc
case err = <-gwErrc:
zap.L().Warn("gRPC gateway server failed", zap.Error(err))
s.gRPCServer.Stop()
zap.L().Warn("closed gRPC server")
<-gRPCErrc
}
s.closeOnce.Do(func() {
close(s.closed)
})
return err
}
var (
ErrAlreadyBootstrapped = errors.New("already bootstrapped")
ErrNotBootstrapped = errors.New("not bootstrapped")
ErrNodeNotFound = errors.New("node not found")
ErrUnexpectedType = errors.New("unexpected type")
ErrStatusCanceled = errors.New("gRPC stream status canceled")
)
func (s *server) Ping(ctx context.Context, req *rpcpb.PingRequest) (*rpcpb.PingResponse, error) {
zap.L().Debug("received ping request")
return &rpcpb.PingResponse{Pid: int32(os.Getpid())}, nil
}
func (s *server) Start(ctx context.Context, req *rpcpb.StartRequest) (*rpcpb.StartResponse, error) {
zap.L().Info("received start request")
if s.getClusterInfo() != nil {
return nil, ErrAlreadyBootstrapped
}
rootDataDir, err := ioutil.TempDir(os.TempDir(), "network-runner-root-data")
if err != nil {
return nil, err
}
info := &rpcpb.ClusterInfo{
Pid: int32(os.Getpid()),
RootDataDir: rootDataDir,
Healthy: false,
}
zap.L().Info("starting",
zap.String("execPath", req.ExecPath),
zap.String("whitelistedSubnets", req.GetWhitelistedSubnets()),
zap.Int32("pid", s.clusterInfo.GetPid()),
zap.String("rootDataDir", s.clusterInfo.GetRootDataDir()),
)
if _, err := os.Stat(req.ExecPath); err != nil {
return nil, ErrNotExists
}
s.mu.Lock()
defer s.mu.Unlock()
if s.network != nil {
return nil, ErrAlreadyBootstrapped
}
s.network, err = newNetwork(req.GetExecPath(), rootDataDir, req.GetWhitelistedSubnets(), req.GetLogLevel())
if err != nil {
return nil, err
}
go s.network.start()
s.clusterInfo = info
go func() {
select {
case <-s.closed:
return
case <-s.network.stopc:
// TODO: fix race from shutdown
return
case <-s.network.readyc:
s.mu.Lock()
s.clusterInfo.NodeNames = s.network.nodeNames
s.clusterInfo.NodeInfos = s.network.nodeInfos
s.clusterInfo.Healthy = true
s.mu.Unlock()
}
}()
return &rpcpb.StartResponse{ClusterInfo: s.clusterInfo}, nil
}
func (s *server) Health(ctx context.Context, req *rpcpb.HealthRequest) (*rpcpb.HealthResponse, error) {
zap.L().Debug("health")
if info := s.getClusterInfo(); info == nil {
return nil, ErrNotBootstrapped
}
zap.L().Info("waiting for healthy")
if err := s.network.waitForHealthy(); err != nil {
return nil, err
}
s.mu.Lock()
defer s.mu.Unlock()
s.network.nodeNames = make([]string, 0)
for name := range s.network.nodeInfos {
s.network.nodeNames = append(s.network.nodeNames, name)
}
s.clusterInfo.NodeNames = s.network.nodeNames
s.clusterInfo.NodeInfos = s.network.nodeInfos
return &rpcpb.HealthResponse{ClusterInfo: s.clusterInfo}, nil
}
func (s *server) URIs(ctx context.Context, req *rpcpb.URIsRequest) (*rpcpb.URIsResponse, error) {
zap.L().Debug("uris")
info := s.getClusterInfo()
if info == nil {
return nil, ErrNotBootstrapped
}
uris := make([]string, 0, len(info.NodeInfos))
for _, i := range info.NodeInfos {
uris = append(uris, i.Uri)
}
sort.Strings(uris)
return &rpcpb.URIsResponse{Uris: uris}, nil
}
func (s *server) Status(ctx context.Context, req *rpcpb.StatusRequest) (*rpcpb.StatusResponse, error) {
zap.L().Debug("received status request")
info := s.getClusterInfo()
if info == nil {
return nil, ErrNotBootstrapped
}
return &rpcpb.StatusResponse{ClusterInfo: info}, nil
}
func (s *server) StreamStatus(req *rpcpb.StreamStatusRequest, stream rpcpb.ControlService_StreamStatusServer) (err error) {
zap.L().Info("received bootstrap status request")
if s.getClusterInfo() == nil {
return ErrNotBootstrapped
}
interval := time.Duration(req.PushInterval)
// returns this method, then server closes the stream
zap.L().Info("pushing status updates to the stream", zap.String("interval", interval.String()))
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
s.sendLoop(stream, interval)
wg.Done()
}()
errc := make(chan error, 1)
go func() {
rerr := s.recvLoop(stream)
if rerr != nil {
if isClientCanceled(stream.Context().Err(), rerr) {
zap.L().Warn("failed to receive status request from gRPC stream due to client cancellation", zap.Error(rerr))
} else {
zap.L().Warn("failed to receive status request from gRPC stream", zap.Error(rerr))
}
}
errc <- rerr
}()
select {
case err = <-errc:
if errors.Is(err, context.Canceled) {
err = ErrStatusCanceled
}
case <-stream.Context().Done():
err = stream.Context().Err()
if errors.Is(err, context.Canceled) {
err = ErrStatusCanceled
}
}
wg.Wait()
return err
}
func (s *server) sendLoop(stream rpcpb.ControlService_StreamStatusServer, interval time.Duration) {
zap.L().Info("start status send loop")
tc := time.NewTicker(1)
defer tc.Stop()
for {
select {
case <-s.rootCtx.Done():
return
case <-s.closed:
return
case <-tc.C:
tc.Reset(interval)
}
zap.L().Debug("sending cluster info")
if err := stream.Send(&rpcpb.StreamStatusResponse{ClusterInfo: s.getClusterInfo()}); err != nil {
if isClientCanceled(stream.Context().Err(), err) {
zap.L().Debug("client stream canceled", zap.Error(err))
return
}
zap.L().Warn("failed to send an event", zap.Error(err))
return
}
}
}
func (s *server) recvLoop(stream rpcpb.ControlService_StreamStatusServer) error {
zap.L().Info("start status receive loop")
for {
select {
case <-s.rootCtx.Done():
return s.rootCtx.Err()
case <-s.closed:
return ErrClosed
default:
}
// receive data from stream
req := new(rpcpb.StatusRequest)
err := stream.RecvMsg(req)
if errors.Is(err, io.EOF) {
zap.L().Debug("received EOF from client; returning to close the stream from server side")
return nil
}
if err != nil {
return err
}
}
}
func (s *server) RemoveNode(ctx context.Context, req *rpcpb.RemoveNodeRequest) (*rpcpb.RemoveNodeResponse, error) {
zap.L().Debug("received remove node request", zap.String("name", req.Name))
if info := s.getClusterInfo(); info == nil {
return nil, ErrNotBootstrapped
}
s.mu.Lock()
defer s.mu.Unlock()
if _, ok := s.network.nodeInfos[req.Name]; !ok {
return nil, ErrNodeNotFound
}
if err := s.network.nw.RemoveNode(req.Name); err != nil {
return nil, err
}
delete(s.network.nodeInfos, req.Name)
s.network.nodeNames = make([]string, 0)
for name := range s.network.nodeInfos {
s.network.nodeNames = append(s.network.nodeNames, name)
}
s.clusterInfo.NodeNames = s.network.nodeNames
s.clusterInfo.NodeInfos = s.network.nodeInfos
zap.L().Info("waiting for healthy")
if err := s.network.waitForHealthy(); err != nil {
return nil, err
}
return &rpcpb.RemoveNodeResponse{ClusterInfo: s.clusterInfo}, nil
}
func (s *server) RestartNode(ctx context.Context, req *rpcpb.RestartNodeRequest) (*rpcpb.RestartNodeResponse, error) {
zap.L().Debug("received remove node request", zap.String("name", req.Name))
if info := s.getClusterInfo(); info == nil {
return nil, ErrNotBootstrapped
}
s.mu.Lock()
defer s.mu.Unlock()
nodeInfo, ok := s.network.nodeInfos[req.Name]
if !ok {
return nil, ErrNodeNotFound
}
found, idx := false, 0
oldNodeConfig := node.Config{}
for i, cfg := range s.network.cfg.NodeConfigs {
if cfg.Name == req.Name {
oldNodeConfig = cfg
found = true
idx = i
break
}
}
if !found {
return nil, ErrNodeNotFound
}
nodeConfig := oldNodeConfig
// keep everything same except config file and binary path
nodeInfo.ExecPath = req.StartRequest.ExecPath
nodeInfo.WhitelistedSubnets = *req.StartRequest.WhitelistedSubnets
nodeConfig.ConfigFile = []byte(fmt.Sprintf(`{
"network-peer-list-gossip-frequency":"250ms",
"network-max-reconnect-delay":"1s",
"public-ip":"127.0.0.1",
"health-check-frequency":"2s",
"api-admin-enabled":true,
"api-ipcs-enabled":true,
"index-enabled":true,
"log-display-level":"INFO",
"log-level":"INFO",
"log-dir":"%s",
"db-dir":"%s",
"whitelisted-subnets":"%s"
}`,
nodeInfo.LogDir,
nodeInfo.DbDir,
nodeInfo.WhitelistedSubnets,
))
implCfg := nodeConfig.ImplSpecificConfig
lcfg, ok := implCfg.(local.NodeConfig)
if !ok {
return nil, ErrUnexpectedType
}
lcfg.BinaryPath = nodeInfo.ExecPath
nodeConfig.ImplSpecificConfig = lcfg
// now remove the node before restart
zap.L().Info("removing the node")
if err := s.network.nw.RemoveNode(req.Name); err != nil {
return nil, err
}
// now adding the new node
zap.L().Info("adding the node")
if _, err := s.network.nw.AddNode(nodeConfig); err != nil {
return nil, err
}
zap.L().Info("waiting for healthy")
if err := s.network.waitForHealthy(); err != nil {
return nil, err
}
// update with the new config
s.network.cfg.NodeConfigs[idx] = nodeConfig
s.clusterInfo.NodeInfos = s.network.nodeInfos
return &rpcpb.RestartNodeResponse{ClusterInfo: s.clusterInfo}, nil
}
func (s *server) Stop(ctx context.Context, req *rpcpb.StopRequest) (*rpcpb.StopResponse, error) {
zap.L().Debug("received stop request")
info := s.getClusterInfo()
if info == nil {
return nil, ErrNotBootstrapped
}
s.mu.Lock()
defer s.mu.Unlock()
s.network.stop()
s.network = nil
info.Healthy = false
s.clusterInfo = nil
return &rpcpb.StopResponse{ClusterInfo: info}, nil
}
func (s *server) getClusterInfo() *rpcpb.ClusterInfo {
s.mu.RLock()
info := s.clusterInfo
s.mu.RUnlock()
return info
}
func isClientCanceled(ctxErr error, err error) bool {
if ctxErr != nil {
return true
}
ev, ok := status.FromError(err)
if !ok {
return false
}
switch ev.Code() {
case codes.Canceled, codes.DeadlineExceeded:
// client-side context cancel or deadline exceeded
// "rpc error: code = Canceled desc = context canceled"
// "rpc error: code = DeadlineExceeded desc = context deadline exceeded"
return true
case codes.Unavailable:
msg := ev.Message()
// client-side context cancel or deadline exceeded with TLS ("http2.errClientDisconnected")
// "rpc error: code = Unavailable desc = client disconnected"
if msg == "client disconnected" {
return true
}
// "grpc/transport.ClientTransport.CloseStream" on canceled streams
// "rpc error: code = Unavailable desc = stream error: stream ID 21; CANCEL")
if strings.HasPrefix(msg, "stream error: ") && strings.HasSuffix(msg, "; CANCEL") {
return true
}
}
return false
}