/
broadcasts.go
124 lines (103 loc) · 2.72 KB
/
broadcasts.go
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// Copyright (c) 2015 Monetas.
// Copyright 2016 Daniel Krawisz.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package store
import (
"bytes"
"github.com/DanielKrawisz/bmagent/store/data"
"github.com/DanielKrawisz/bmutil"
"github.com/boltdb/bolt"
)
// BroadcastAddresses keeps track of the broadcasts that the user is listening
// to. It provides functionality for adding, removal and running a function for
// each address.
type BroadcastAddresses struct {
db *bolt.DB
username []byte
addrs []bmutil.Address // All broadcast addresses.
}
// newBroadcastsStore creates a new BroadcastAddresses object after doing the
// necessary initialization.
func newBroadcastsStore(db *bolt.DB, username string) (*BroadcastAddresses, error) {
b := &BroadcastAddresses{
db: db,
username: []byte(username),
addrs: make([]bmutil.Address, 0),
}
err := db.Update(func(tx *bolt.Tx) error {
userbucket, err := tx.CreateBucketIfNotExists([]byte(username))
if err != nil {
return err
}
bucket, err := userbucket.CreateBucketIfNotExists(broadcastAddressesBucket)
if err != nil {
return err
}
return bucket.ForEach(func(k, _ []byte) error {
addr, err := bmutil.DecodeAddress(string(k))
if err != nil {
return err
}
b.addrs = append(b.addrs, addr)
return nil
})
})
if err != nil {
return nil, err
}
return b, nil
}
// Add adds a new address to the store.
func (b *BroadcastAddresses) Add(address string) error {
addr, err := bmutil.DecodeAddress(address)
if err != nil {
return err
}
k := []byte(address)
v := []byte{}
err = b.db.Update(func(tx *bolt.Tx) error {
return tx.Bucket(b.username).Bucket(broadcastAddressesBucket).Put(k, v)
})
if err != nil {
return err
}
b.addrs = append(b.addrs, addr)
return nil
}
// Remove removes an address from the store.
func (b *BroadcastAddresses) Remove(address string) error {
addr, err := bmutil.DecodeAddress(address)
if err != nil {
return err
}
k := []byte(address)
err = b.db.Update(func(tx *bolt.Tx) error {
if tx.Bucket(b.username).Bucket(broadcastAddressesBucket).Get(k) == nil {
return data.ErrNotFound
}
return tx.Bucket(broadcastAddressesBucket).Delete(k)
})
if err != nil {
return err
}
for i, t := range b.addrs {
if bytes.Equal(t.RipeHash()[:], addr.RipeHash()[:]) {
// Delete.
b.addrs = append(b.addrs[:i], b.addrs[i+1:]...)
return nil
}
}
return nil
}
// ForEach runs the specified function for each broadcast address, breaking
// early if an error occurs.
func (b *BroadcastAddresses) ForEach(f func(address bmutil.Address) error) error {
for _, addr := range b.addrs {
err := f(addr)
if err != nil {
return err
}
}
return nil
}