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connect.go
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connect.go
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// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0
package connect
import (
"crypto/tls"
"errors"
"net"
"sync/atomic"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/go-hclog"
"github.com/hashicorp/horizon/pkg/pb"
"github.com/hashicorp/horizon/pkg/wire"
"github.com/hashicorp/yamux"
)
type Session struct {
conn net.Conn
session *yamux.Session
}
type Conn struct {
serviceId *pb.ULID
fr *wire.FramingReader
fw *wire.FramingWriter
}
var ErrInvalidToken = errors.New("invalid token")
// We're trying this because in a busy system it could be a limiting
// factor so having it pre-tracked will be useful.
// TODO(emp): expose this via expvar or something like that.
var activeSessions = new(int64)
func Connect(L hclog.Logger, addr, token string) (*Session, error) {
var clientTlsConfig tls.Config
clientTlsConfig.InsecureSkipVerify = true
clientTlsConfig.NextProtos = []string{"hzn"}
cconn, err := tls.Dial("tcp", addr, &clientTlsConfig)
if err != nil {
return nil, err
}
var preamble pb.Preamble
preamble.Token = token
fw, err := wire.NewFramingWriter(cconn)
if err != nil {
return nil, err
}
_, err = fw.WriteMarshal(1, &preamble)
if err != nil {
return nil, err
}
fr, err := wire.NewFramingReader(cconn)
if err != nil {
return nil, err
}
var confirmation pb.Confirmation
_, _, err = fr.ReadMarshal(&confirmation)
if err != nil {
return nil, err
}
if confirmation.Status != "connected" {
return nil, ErrInvalidToken
}
bc := &wire.ComposedConn{
Reader: fr.BufReader(),
Writer: cconn,
Closer: cconn,
}
cfg := yamux.DefaultConfig()
cfg.EnableKeepAlive = true
cfg.KeepAliveInterval = 30 * time.Second
cfg.Logger = L.StandardLogger(&hclog.StandardLoggerOptions{
InferLevels: true,
})
cfg.LogOutput = nil
session, err := yamux.Client(bc, cfg)
if err != nil {
return nil, err
}
val := atomic.AddInt64(activeSessions, 1)
metrics.SetGauge([]string{"connect", "sessions"}, float32(val))
return &Session{conn: cconn, session: session}, nil
}
func (s *Session) Close() error {
val := atomic.AddInt64(activeSessions, -1)
metrics.SetGauge([]string{"connect", "sessions"}, float32(val))
s.session.Close()
return s.conn.Close()
}
func (s *Session) ConnecToAccountService(acc *pb.Account, labels *pb.LabelSet) (*Conn, error) {
stream, err := s.session.OpenStream()
if err != nil {
return nil, err
}
fr2, err := wire.NewFramingReader(stream)
if err != nil {
return nil, err
}
fw2, err := wire.NewFramingWriter(stream)
if err != nil {
return nil, err
}
var conreq pb.ConnectRequest
conreq.Target = labels
conreq.PivotAccount = acc
_, err = fw2.WriteMarshal(1, &conreq)
if err != nil {
return nil, err
}
var ack pb.ConnectAck
tag, _, err := fr2.ReadMarshal(&ack)
if err != nil {
return nil, err
}
if tag != 1 {
return nil, wire.ErrProtocolError
}
return &Conn{serviceId: ack.ServiceId, fr: fr2, fw: fw2}, nil
}
func (s *Session) ConnectToService(labels *pb.LabelSet) (*Conn, error) {
return s.ConnecToAccountService(nil, labels)
}
func (c *Conn) ReadMarshal(v wire.Unmarshaller) (byte, error) {
tag, _, err := c.fr.ReadMarshal(v)
if err != nil {
return 0, err
}
return tag, nil
}
func (c *Conn) WriteMarshal(tag byte, v wire.Marshaller) error {
_, err := c.fw.WriteMarshal(tag, v)
return err
}
func (c *Conn) WireContext(accountId *pb.Account) wire.Context {
return wire.NewContext(accountId, c.fr, c.fw)
}
func (c *Conn) ServiceId() *pb.ULID {
return c.serviceId
}