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addressbook.go
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addressbook.go
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// Copyright 2020 The Swarm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package addressbook
import (
"errors"
"fmt"
"strings"
"github.com/ethsana/sana/pkg/bzz"
"github.com/ethsana/sana/pkg/storage"
"github.com/ethsana/sana/pkg/swarm"
)
const keyPrefix = "addressbook_entry_"
var _ Interface = (*store)(nil)
var ErrNotFound = errors.New("addressbook: not found")
// Interface is the AddressBook interface.
type Interface interface {
GetPutter
Remover
// Overlays returns a list of all overlay addresses saved in addressbook.
Overlays() ([]swarm.Address, error)
// IterateOverlays exposes overlays in a form of an iterator.
IterateOverlays(func(swarm.Address) (bool, error)) error
// Addresses returns a list of all bzz.Address-es saved in addressbook.
Addresses() ([]bzz.Address, error)
}
type GetPutter interface {
Getter
Putter
}
type Getter interface {
// Get returns pointer to saved bzz.Address for requested overlay address.
Get(overlay swarm.Address) (addr *bzz.Address, err error)
}
type Putter interface {
// Put saves relation between peer overlay address and bzz.Address address.
Put(overlay swarm.Address, addr bzz.Address) (err error)
}
type Remover interface {
// Remove removes overlay address.
Remove(overlay swarm.Address) error
}
type store struct {
store storage.StateStorer
}
// New creates new addressbook for state storer.
func New(storer storage.StateStorer) Interface {
return &store{
store: storer,
}
}
func (s *store) Get(overlay swarm.Address) (*bzz.Address, error) {
key := keyPrefix + overlay.String()
v := &bzz.Address{}
err := s.store.Get(key, &v)
if err != nil {
if err == storage.ErrNotFound {
return nil, ErrNotFound
}
return nil, err
}
return v, nil
}
func (s *store) Put(overlay swarm.Address, addr bzz.Address) (err error) {
key := keyPrefix + overlay.String()
return s.store.Put(key, &addr)
}
func (s *store) Remove(overlay swarm.Address) error {
return s.store.Delete(keyPrefix + overlay.String())
}
func (s *store) IterateOverlays(cb func(swarm.Address) (bool, error)) error {
return s.store.Iterate(keyPrefix, func(key, _ []byte) (stop bool, err error) {
k := string(key)
if !strings.HasPrefix(k, keyPrefix) {
return true, nil
}
split := strings.SplitAfter(k, keyPrefix)
if len(split) != 2 {
return true, fmt.Errorf("invalid overlay key: %s", k)
}
addr, err := swarm.ParseHexAddress(split[1])
if err != nil {
return true, err
}
stop, err = cb(addr)
if err != nil {
return true, err
}
if stop {
return true, nil
}
return false, nil
})
}
func (s *store) Overlays() (overlays []swarm.Address, err error) {
err = s.IterateOverlays(func(addr swarm.Address) (stop bool, err error) {
overlays = append(overlays, addr)
return false, nil
})
if err != nil {
return nil, err
}
return overlays, nil
}
func (s *store) Addresses() (addresses []bzz.Address, err error) {
err = s.store.Iterate(keyPrefix, func(_, value []byte) (stop bool, err error) {
entry := &bzz.Address{}
err = entry.UnmarshalJSON(value)
if err != nil {
return true, err
}
addresses = append(addresses, *entry)
return false, nil
})
if err != nil {
return nil, err
}
return addresses, nil
}