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subscribe.go
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subscribe.go
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package electrum
import (
"context"
"encoding/json"
"errors"
"sync"
)
// SubscribeHeadersResp represent the response to SubscribeHeaders().
type SubscribeHeadersResp struct {
Result *SubscribeHeadersResult `json:"result"`
}
// SubscribeHeadersNotif represent the notification to SubscribeHeaders().
type SubscribeHeadersNotif struct {
Params []*SubscribeHeadersResult `json:"params"`
}
// SubscribeHeadersResult represents the content of the result field in the response to SubscribeHeaders().
type SubscribeHeadersResult struct {
Height int32 `json:"height,omitempty"`
Hex string `json:"hex"`
}
// SubscribeHeaders subscribes to receive block headers notifications when new blocks are found.
// https://electrumx.readthedocs.io/en/latest/protocol-methods.html#blockchain-headers-subscribe
func (s *Client) SubscribeHeaders(ctx context.Context) (<-chan *SubscribeHeadersResult, error) {
var resp SubscribeHeadersResp
err := s.request(ctx, "blockchain.headers.subscribe", []interface{}{}, &resp)
if err != nil {
return nil, err
}
respChan := make(chan *SubscribeHeadersResult, 1)
respChan <- resp.Result
go func() {
for msg := range s.listenPush("blockchain.headers.subscribe") {
if msg.err != nil {
return
}
var resp SubscribeHeadersNotif
err := json.Unmarshal(msg.content, &resp)
if err != nil {
return
}
for _, param := range resp.Params {
respChan <- param
}
}
}()
return respChan, nil
}
// ScripthashSubscription ...
type ScripthashSubscription struct {
server *Client
notifChan chan *SubscribeNotif
subscribedSH []string
scripthashMap map[string]string
lock sync.RWMutex
}
// SubscribeNotif represent the notification to SubscribeScripthash() and SubscribeMasternode().
type SubscribeNotif struct {
Params [2]string `json:"params"`
}
// SubscribeScripthash ...
func (s *Client) SubscribeScripthash() (*ScripthashSubscription, <-chan *SubscribeNotif) {
sub := &ScripthashSubscription{
server: s,
notifChan: make(chan *SubscribeNotif, 1),
scripthashMap: make(map[string]string),
}
go func() {
for msg := range s.listenPush("blockchain.scripthash.subscribe") {
if msg.err != nil {
return
}
var resp SubscribeNotif
err := json.Unmarshal(msg.content, &resp)
if err != nil {
return
}
sub.lock.Lock()
for _, a := range sub.subscribedSH {
if a == resp.Params[0] {
sub.notifChan <- &resp
break
}
}
sub.lock.Unlock()
}
}()
return sub, sub.notifChan
}
// Add ...
func (sub *ScripthashSubscription) Add(ctx context.Context, scripthash string, address ...string) error {
var resp basicResp
err := sub.server.request(ctx, "blockchain.scripthash.subscribe", []interface{}{scripthash}, &resp)
if err != nil {
return err
}
if len(resp.Result) > 0 {
sub.notifChan <- &SubscribeNotif{[2]string{scripthash, resp.Result}}
}
sub.lock.Lock()
sub.subscribedSH = append(sub.subscribedSH[:], scripthash)
if len(address) > 0 {
sub.scripthashMap[scripthash] = address[0]
}
sub.lock.Unlock()
return nil
}
// GetAddress ...
func (sub *ScripthashSubscription) GetAddress(scripthash string) (string, error) {
address, ok := sub.scripthashMap[scripthash]
if ok {
return address, nil
}
return "", errors.New("scripthash not found in map")
}
// GetScripthash ...
func (sub *ScripthashSubscription) GetScripthash(address string) (string, error) {
var found bool
var scripthash string
for k, v := range sub.scripthashMap {
if v == address {
scripthash = k
found = true
}
}
if found {
return scripthash, nil
}
return "", errors.New("address not found in map")
}
// GetChannel ...
func (sub *ScripthashSubscription) GetChannel() <-chan *SubscribeNotif {
return sub.notifChan
}
// Remove ...
func (sub *ScripthashSubscription) Remove(scripthash string) error {
for i, v := range sub.subscribedSH {
if v == scripthash {
sub.lock.Lock()
sub.subscribedSH = append(sub.subscribedSH[:i], sub.subscribedSH[i+1:]...)
sub.lock.Unlock()
return nil
}
}
return errors.New("scripthash not found")
}
// RemoveAddress ...
func (sub *ScripthashSubscription) RemoveAddress(address string) error {
scripthash, err := sub.GetScripthash(address)
if err != nil {
return err
}
for i, v := range sub.subscribedSH {
if v == scripthash {
sub.lock.Lock()
sub.subscribedSH = append(sub.subscribedSH[:i], sub.subscribedSH[i+1:]...)
delete(sub.scripthashMap, scripthash)
sub.lock.Unlock()
return nil
}
}
return errors.New("scripthash not found")
}
// Resubscribe ...
func (sub *ScripthashSubscription) Resubscribe(ctx context.Context) error {
for _, v := range sub.subscribedSH {
err := sub.Add(ctx, v)
if err != nil {
return err
}
}
return nil
}
// SubscribeMasternode subscribes to receive notifications when a masternode status changes.
// https://electrumx.readthedocs.io/en/latest/protocol-methods.html#blockchain-headers-subscribe
func (s *Client) SubscribeMasternode(ctx context.Context, collateral string) (<-chan string, error) {
var resp basicResp
err := s.request(ctx, "blockchain.masternode.subscribe", []interface{}{collateral}, &resp)
if err != nil {
return nil, err
}
respChan := make(chan string, 1)
if len(resp.Result) > 0 {
respChan <- resp.Result
}
go func() {
for msg := range s.listenPush("blockchain.masternode.subscribe") {
if msg.err != nil {
return
}
var resp SubscribeNotif
err := json.Unmarshal(msg.content, &resp)
if err != nil {
return
}
for _, param := range resp.Params {
respChan <- param
}
}
}()
return respChan, nil
}