2018-01-31 07:23:17 -07:00
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package bchain
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2018-01-19 07:58:46 -07:00
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import (
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"encoding/binary"
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2018-02-26 05:10:53 -07:00
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"time"
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2018-01-19 07:58:46 -07:00
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2018-01-30 10:22:25 -07:00
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"github.com/golang/glog"
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2018-01-19 07:58:46 -07:00
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zmq "github.com/pebbe/zmq4"
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)
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2018-01-22 08:46:54 -07:00
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// MQ is message queue listener handle
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type MQ struct {
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context *zmq.Context
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socket *zmq.Socket
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isRunning bool
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finished chan bool
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}
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// MQMessage contains data received from Bitcoind message queue
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type MQMessage struct {
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Topic string
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Sequence uint32
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Body []byte
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}
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2018-01-31 09:51:48 -07:00
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// NewMQ creates new Bitcoind ZeroMQ listener
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2018-01-22 08:46:54 -07:00
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// callback function receives messages
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2018-01-31 07:23:17 -07:00
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func NewMQ(binding string, callback func(*MQMessage)) (*MQ, error) {
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2018-01-19 07:58:46 -07:00
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context, err := zmq.NewContext()
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if err != nil {
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2018-01-22 08:46:54 -07:00
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return nil, err
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2018-01-19 07:58:46 -07:00
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}
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socket, err := context.NewSocket(zmq.SUB)
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if err != nil {
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2018-01-22 08:46:54 -07:00
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return nil, err
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2018-01-19 07:58:46 -07:00
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}
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2018-02-23 03:56:44 -07:00
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err = socket.SetSubscribe("hashblock")
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if err != nil {
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return nil, err
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}
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err = socket.SetSubscribe("hashtx")
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if err != nil {
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return nil, err
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}
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2018-01-31 07:03:06 -07:00
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// for now do not use raw subscriptions - we would have to handle skipped/lost notifications from zeromq
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// on each notification we do sync or syncmempool respectively
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// socket.SetSubscribe("rawblock")
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// socket.SetSubscribe("rawtx")
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2018-02-23 03:56:44 -07:00
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err = socket.Connect(binding)
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if err != nil {
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return nil, err
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}
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2018-01-30 10:22:25 -07:00
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glog.Info("MQ listening to ", binding)
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2018-01-22 08:46:54 -07:00
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mq := &MQ{context, socket, true, make(chan bool)}
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go mq.run(callback)
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return mq, nil
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}
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func (mq *MQ) run(callback func(*MQMessage)) {
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mq.isRunning = true
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for {
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msg, err := mq.socket.RecvMessageBytes(0)
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2018-01-19 07:58:46 -07:00
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if err != nil {
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2018-02-26 05:10:53 -07:00
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if zmq.AsErrno(err) == zmq.Errno(zmq.ETERM) || err.Error() == "Socket is closed" {
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close(mq.finished)
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2018-01-30 10:22:25 -07:00
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glog.Info("MQ loop terminated")
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2018-01-22 08:46:54 -07:00
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break
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}
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2018-02-26 05:10:53 -07:00
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glog.Error("MQ RecvMessageBytes error ", err, ", ", zmq.AsErrno(err))
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time.Sleep(100 * time.Millisecond)
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2018-01-22 08:46:54 -07:00
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}
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if msg != nil && len(msg) >= 3 {
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sequence := uint32(0)
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if len(msg[len(msg)-1]) == 4 {
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sequence = binary.LittleEndian.Uint32(msg[len(msg)-1])
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}
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m := &MQMessage{
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Topic: string(msg[0]),
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Sequence: sequence,
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Body: msg[1],
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}
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callback(m)
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}
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}
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mq.isRunning = false
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}
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// Shutdown stops listening to the ZeroMQ and closes the connection
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func (mq *MQ) Shutdown() error {
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2018-01-30 10:22:25 -07:00
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glog.Info("MQ server shutdown")
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2018-01-22 08:46:54 -07:00
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if mq.isRunning {
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2018-02-23 03:56:44 -07:00
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mq.socket.SetUnsubscribe("hashtx")
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mq.socket.SetUnsubscribe("hashblock")
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2018-01-22 08:46:54 -07:00
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// if errors in socket.Close or context.Term, let it close ungracefully
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if err := mq.socket.Close(); err != nil {
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return err
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2018-01-19 07:58:46 -07:00
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}
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2018-01-22 08:46:54 -07:00
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if err := mq.context.Term(); err != nil {
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return err
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2018-01-19 07:58:46 -07:00
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}
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2018-01-22 08:46:54 -07:00
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_, _ = <-mq.finished
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2018-01-30 10:22:25 -07:00
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glog.Info("MQ server shutdown finished")
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2018-01-19 07:58:46 -07:00
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}
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2018-01-22 08:46:54 -07:00
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return nil
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2018-01-19 07:58:46 -07:00
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}
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