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manager.go
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/
manager.go
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package accounts
import (
"reflect"
"sort"
"sync"
"github.com/ligo-ai/ligo-chain/utilities/event"
)
type Manager struct {
backends map[reflect.Type][]Backend
updaters []event.Subscription
updates chan WalletEvent
wallets []Wallet
feed event.Feed
quit chan chan error
lock sync.RWMutex
}
func NewManager(backends ...Backend) *Manager {
var wallets []Wallet
for _, backend := range backends {
wallets = merge(wallets, backend.Wallets()...)
}
updates := make(chan WalletEvent, 4*len(backends))
subs := make([]event.Subscription, len(backends))
for i, backend := range backends {
subs[i] = backend.Subscribe(updates)
}
am := &Manager{
backends: make(map[reflect.Type][]Backend),
updaters: subs,
updates: updates,
wallets: wallets,
quit: make(chan chan error),
}
for _, backend := range backends {
kind := reflect.TypeOf(backend)
am.backends[kind] = append(am.backends[kind], backend)
}
go am.update()
return am
}
func (am *Manager) Close() error {
errc := make(chan error)
am.quit <- errc
return <-errc
}
func (am *Manager) update() {
defer func() {
am.lock.Lock()
for _, sub := range am.updaters {
sub.Unsubscribe()
}
am.updaters = nil
am.lock.Unlock()
}()
for {
select {
case event := <-am.updates:
am.lock.Lock()
switch event.Kind {
case WalletArrived:
am.wallets = merge(am.wallets, event.Wallet)
case WalletDropped:
am.wallets = drop(am.wallets, event.Wallet)
}
am.lock.Unlock()
am.feed.Send(event)
case errc := <-am.quit:
errc <- nil
return
}
}
}
func (am *Manager) Backends(kind reflect.Type) []Backend {
return am.backends[kind]
}
func (am *Manager) Wallets() []Wallet {
am.lock.RLock()
defer am.lock.RUnlock()
cpy := make([]Wallet, len(am.wallets))
copy(cpy, am.wallets)
return cpy
}
func (am *Manager) Wallet(url string) (Wallet, error) {
am.lock.RLock()
defer am.lock.RUnlock()
parsed, err := parseURL(url)
if err != nil {
return nil, err
}
for _, wallet := range am.Wallets() {
if wallet.URL() == parsed {
return wallet, nil
}
}
return nil, ErrUnknownWallet
}
func (am *Manager) Find(account Account) (Wallet, error) {
am.lock.RLock()
defer am.lock.RUnlock()
for _, wallet := range am.wallets {
if wallet.Contains(account) {
return wallet, nil
}
}
return nil, ErrUnknownAccount
}
func (am *Manager) Subscribe(sink chan<- WalletEvent) event.Subscription {
return am.feed.Subscribe(sink)
}
func merge(slice []Wallet, wallets ...Wallet) []Wallet {
for _, wallet := range wallets {
n := sort.Search(len(slice), func(i int) bool { return slice[i].URL().Cmp(wallet.URL()) >= 0 })
if n == len(slice) {
slice = append(slice, wallet)
continue
}
slice = append(slice[:n], append([]Wallet{wallet}, slice[n:]...)...)
}
return slice
}
func drop(slice []Wallet, wallets ...Wallet) []Wallet {
for _, wallet := range wallets {
n := sort.Search(len(slice), func(i int) bool { return slice[i].URL().Cmp(wallet.URL()) >= 0 })
if n == len(slice) {
continue
}
slice = append(slice[:n], slice[n+1:]...)
}
return slice
}