137 lines
2.5 KiB
Go
137 lines
2.5 KiB
Go
package wallet
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// copied from https://github.com/d4l3k/go-electrum
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import (
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"bufio"
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"crypto/tls"
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"encoding/json"
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"fmt"
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"net"
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"time"
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"github.com/lbryio/lbry.go/v2/extras/errors"
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"github.com/lbryio/lbry.go/v2/extras/stop"
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log "github.com/sirupsen/logrus"
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)
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type TCPTransport struct {
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conn net.Conn
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responses chan []byte
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errors chan error
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grp *stop.Group
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}
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func NewTransport(addr string, config *tls.Config) (*TCPTransport, error) {
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var conn net.Conn
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var err error
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timeout := 5 * time.Second
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if config != nil {
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conn, err = tls.DialWithDialer(&net.Dialer{Timeout: timeout}, "tcp", addr, config)
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} else {
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conn, err = net.DialTimeout("tcp", addr, timeout)
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}
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if err != nil {
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return nil, err
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}
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t := &TCPTransport{
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conn: conn,
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responses: make(chan []byte),
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errors: make(chan error),
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grp: stop.New(),
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}
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t.grp.Add(1)
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go func() {
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defer t.grp.Done()
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<-t.grp.Ch()
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t.close()
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}()
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t.grp.Add(1)
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go func() {
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defer t.grp.Done()
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t.listen()
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}()
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err = t.test()
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if err != nil {
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t.grp.StopAndWait()
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return nil, errors.Prefix(addr, err)
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}
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return t, nil
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}
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const delimiter = byte('\n')
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func (t *TCPTransport) Send(body []byte) error {
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log.Debugf("%s <- %s", t.conn.RemoteAddr(), body)
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_, err := t.conn.Write(body)
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return err
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}
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func (t *TCPTransport) Responses() <-chan []byte { return t.responses }
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func (t *TCPTransport) Errors() <-chan error { return t.errors }
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func (t *TCPTransport) Shutdown() { t.grp.StopAndWait() }
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func (t *TCPTransport) listen() {
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reader := bufio.NewReader(t.conn)
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for {
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line, err := reader.ReadBytes(delimiter)
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if err != nil {
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t.error(err)
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return
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}
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log.Debugf("%s -> %s", t.conn.RemoteAddr(), line)
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t.responses <- line
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}
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}
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func (t *TCPTransport) error(err error) {
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select {
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case t.errors <- err:
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default:
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}
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}
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func (t *TCPTransport) test() error {
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err := t.Send([]byte(`{"id":1,"method":"server.version"}` + "\n"))
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if err != nil {
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return errors.Err(err)
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}
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var data []byte
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select {
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case data = <-t.Responses():
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case <-time.Tick(1 * time.Second):
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return errors.Err(ErrTimeout)
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}
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var response struct {
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Error struct {
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Message string `json:"message"`
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} `json:"error"`
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}
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err = json.Unmarshal(data, &response)
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if err != nil {
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return errors.Err(err)
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}
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if response.Error.Message != "" {
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return fmt.Errorf(response.Error.Message)
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}
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return nil
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}
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func (t *TCPTransport) close() {
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err := t.conn.Close()
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if err != nil {
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t.error(err)
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}
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}
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