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upstream.go
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upstream.go
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// SPDX-License-Identifier: ISC
// Copyright (c) 2014-2020 Bitmark Inc.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package upstream
import (
"encoding/binary"
"fmt"
"time"
"github.com/bitmark-inc/bitmarkd/blockdigest"
"github.com/bitmark-inc/bitmarkd/fault"
"github.com/bitmark-inc/bitmarkd/mode"
"github.com/bitmark-inc/bitmarkd/util"
"github.com/bitmark-inc/bitmarkd/zmqutil"
)
// ActiveInThePast - active upstream in past time
func (u *upstreamData) ActiveInThePast(d time.Duration) bool {
now := time.Now()
limit := now.Add(-d)
active := limit.Before(u.lastResponseTime)
difference := now.Sub(u.lastResponseTime).Seconds()
u.log.Debugf("active: %t, last response time %s, difference %f seconds",
active,
u.lastResponseTime.Format("2006-01-02, 15:04:05 -0700"),
difference,
)
return active
}
// Destroy - shutdown a connection and terminate its background processes
func (u *upstreamData) Destroy() {
if u != nil {
close(u.shutdown)
}
}
// ResetServer - clear Server side info of Zmq client for reusing the
// upstream
func (u *upstreamData) ResetServer() {
u.client.Close()
u.connected = false
u.remoteHeight = 0
}
// IsConnectedTo - check the current destination
//
// does not mean actually connected, as could be in a timeout and
// reconnect state
func (u *upstreamData) IsConnectedTo(serverPublicKey []byte) bool {
return u.client.IsConnectedTo(serverPublicKey)
}
// IsConnected - check if registered and have a valid connection
func (u *upstreamData) IsConnected() bool {
return u.connected
}
// ConnectedTo - if registered return the connection data
func (u *upstreamData) ConnectedTo() *zmqutil.Connected {
return u.client.ConnectedTo()
}
// Connect - connect (or reconnect) to a specific server
func (u *upstreamData) Connect(address *util.Connection, serverPublicKey []byte) error {
u.log.Infof("connecting to address: %s", address)
u.log.Infof("connecting to server: %x", serverPublicKey)
return u.client.Connect(address, serverPublicKey, mode.ChainName())
}
// ServerPublicKey - return the internal ZeroMQ client data
func (u *upstreamData) ServerPublicKey() []byte {
return u.client.ServerPublicKey()
}
// RemoteDigestOfHeight - fetch block digest from a specific block number
func (u *upstreamData) RemoteDigestOfHeight(blockNumber uint64) (blockdigest.Digest, error) {
remoteAddr, _ := u.RemoteAddr()
u.log.Debugf("remote address %s, get block digest %d", remoteAddr, blockNumber)
parameter := make([]byte, 8)
binary.BigEndian.PutUint64(parameter, blockNumber)
// critical section - lock out the runner process
u.Lock()
var data [][]byte
err := u.client.Send("H", parameter)
if err == nil {
data, err = u.client.Receive(0)
}
u.Unlock()
if err != nil {
return blockdigest.Digest{}, err
}
if len(data) != 2 {
return blockdigest.Digest{}, fault.InvalidPeerResponse
}
switch string(data[0]) {
case "E":
return blockdigest.Digest{}, fault.BlockNotFound
case "H":
d := blockdigest.Digest{}
if blockdigest.Length == len(data[1]) {
err := blockdigest.DigestFromBytes(&d, data[1])
return d, err
}
default:
}
return blockdigest.Digest{}, fault.InvalidPeerResponse
}
// GetBlockData - fetch block data from a specific block number
// Note: returned data is always nil for error conditions
func (u *upstreamData) GetBlockData(blockNumber uint64) ([]byte, error) {
parameter := make([]byte, 8)
binary.BigEndian.PutUint64(parameter, blockNumber)
// critical section - lock out the runner process
u.Lock()
var data [][]byte
err := u.client.Send("B", parameter)
if err == nil {
data, err = u.client.Receive(0)
}
u.Unlock()
if err != nil {
return nil, err
}
if len(data) != 2 {
return nil, fault.InvalidPeerResponse
}
switch string(data[0]) {
case "E":
return nil, fault.BlockNotFound
case "B":
return data[1], nil
default:
}
return nil, fault.InvalidPeerResponse
}
// must have lock held before calling
func (u *upstreamData) RemoteHeight() (uint64, error) {
u.log.Infof("RemoteHeight: client: %s", u.client)
err := u.client.Send("N")
if err != nil {
u.log.Errorf("RemoteHeight: %s send error: %s", u.client, err)
return 0, err
}
data, err := u.client.Receive(0)
if err != nil {
u.log.Errorf("RemoteHeight: %s receive error: %s", u.client, err)
return 0, err
}
if len(data) != 2 {
return 0, fmt.Errorf("RemoteHeight: received: %d expected: 2", len(data))
}
switch string(data[0]) {
case "E":
return 0, fmt.Errorf("RemoteHeight: error response: %q", data[1])
case "N":
if len(data[1]) != 8 {
return 0, fmt.Errorf("RemoteHeight: invalid response: %q", data[1])
}
height := binary.BigEndian.Uint64(data[1])
u.log.Infof("height: %d", height)
return height, nil
default:
return 0, fmt.Errorf("RemoteHeight: unexpected response: %q", data[0])
}
}
// CachedRemoteDigestOfLocalHeight - cached remote digest of local block height
func (u *upstreamData) CachedRemoteDigestOfLocalHeight() blockdigest.Digest {
return u.remoteDigestOfLocalHeight
}
// RemoteAddr - remote client address
func (u *upstreamData) RemoteAddr() (string, error) {
var err error
if u.client == nil {
err = fault.ClientSocketNotCreated
} else if !u.client.IsConnected() {
err = fault.ClientSocketNotConnected
}
if err != nil {
u.log.Warnf("remote address not available error: %s", err)
return "", err
}
return u.client.String(), nil
}
// Name - upstream name
func (u *upstreamData) Name() string {
return u.name
}
// CachedRemoteHeight - cached remote client height
func (u *upstreamData) CachedRemoteHeight() uint64 {
return u.remoteHeight
}
// LocalHeight - local block height
func (u *upstreamData) LocalHeight() uint64 {
return u.localHeight
}