/
server.go
167 lines (128 loc) · 3.62 KB
/
server.go
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// SPDX-FileCopyrightText: 2023 Steffen Vogel <post@steffenvogel.de>
// SPDX-License-Identifier: Apache-2.0
package grpc
import (
"context"
"crypto/tls"
"errors"
"fmt"
"io"
"os"
"slices"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"cunicu.li/cunicu/pkg/buildinfo"
"cunicu.li/cunicu/pkg/crypto"
"cunicu.li/cunicu/pkg/log"
"cunicu.li/cunicu/pkg/proto"
signalingproto "cunicu.li/cunicu/pkg/proto/signaling"
"cunicu.li/cunicu/pkg/signaling"
)
type Server struct {
signalingproto.UnimplementedSignalingServer
topicRegistry
*grpc.Server
logger *log.Logger
}
func NewSignalingServer(opts ...grpc.ServerOption) *Server {
logger := log.Global.Named("grpc.server")
s := &Server{
topicRegistry: topicRegistry{
topics: map[crypto.Key]*Topic{},
},
Server: grpc.NewServer(opts...),
logger: logger,
}
signalingproto.RegisterSignalingServer(s, s)
return s
}
func NewServer(opts ...grpc.ServerOption) (*grpc.Server, error) {
opts = slices.Clone(opts)
opts = append(opts,
grpc.MaxConcurrentStreams(10000),
)
if fn := os.Getenv("SSLKEYLOGFILE"); fn != "" {
wr, err := os.OpenFile(fn, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o600)
if err != nil {
return nil, fmt.Errorf("failed to open SSL keylog file: %w", err)
}
opts = append(opts,
grpc.Creds(
credentials.NewTLS(&tls.Config{
MinVersion: tls.VersionTLS13,
KeyLogWriter: wr,
}),
),
)
}
return grpc.NewServer(opts...), nil
}
func (s *Server) Subscribe(params *signalingproto.SubscribeParams, stream signalingproto.Signaling_SubscribeServer) error {
pk, err := crypto.ParseKeyBytes(params.Key)
if err != nil {
return fmt.Errorf("invalid key: %w", err)
}
top := s.getTopic(&pk)
ch := top.Subscribe()
defer top.Unsubscribe(ch)
// We send an empty envelope to signal the subscriber that the subscription
// has been created. This avoids a race between Subscribe() & Publish() from the
// clients view-point.
if err := stream.Send(&signalingproto.Envelope{}); err != nil {
return fmt.Errorf("failed to send sync envelope: %w", err)
}
s.logger.Debug("Subscription stream opened",
zap.Any("recipient", pk))
out:
for {
select {
case env, ok := <-ch:
if !ok {
break out
}
s.logger.Debug("Sending envelope to subscriber",
zap.Any("recipient", env.Recipient),
zap.Any("sender", env.Sender))
if err := stream.Send(env); errors.Is(err, io.EOF) {
break out
} else if err != nil {
s.logger.Error("Failed to send envelope", zap.Error(err))
}
case <-stream.Context().Done():
break out
}
}
s.logger.Debug("Subscription stream closed",
zap.Any("recipient", pk))
return nil
}
func (s *Server) Publish(_ context.Context, env *signaling.Envelope) (*proto.Empty, error) {
var err error
var pkRecipient, pkSender crypto.Key
if pkRecipient, err = crypto.ParseKeyBytes(env.Recipient); err != nil {
return &proto.Empty{}, fmt.Errorf("invalid recipient key: %w", err)
}
if pkSender, err = crypto.ParseKeyBytes(env.Sender); err != nil {
return &proto.Empty{}, fmt.Errorf("invalid sender key: %w", err)
}
t := s.getTopic(&pkRecipient)
s.logger.Debug("Start publishing envelope",
zap.Any("recipient", pkRecipient),
zap.Any("sender", pkSender))
t.Publish(env)
s.logger.Debug("Published envelope",
zap.Any("recipient", pkRecipient),
zap.Any("sender", pkSender))
return &proto.Empty{}, nil
}
func (s *Server) Close() error {
if err := s.topicRegistry.Close(); err != nil {
return err
}
s.Server.GracefulStop()
return nil
}
func (s *Server) GetBuildInfo(context.Context, *proto.Empty) (*proto.BuildInfo, error) {
return buildinfo.BuildInfo(), nil
}