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accounts.go
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accounts.go
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// Package account stores and tracks accounts within a Chain Core.
package account
import (
"context"
stdsql "database/sql"
"encoding/json"
"sync"
"time"
"github.com/golang/groupcache/lru"
"chain/core/account/utxodb"
"chain/core/pin"
"chain/core/signers"
"chain/crypto/ed25519/chainkd"
"chain/database/pg"
"chain/database/sql"
"chain/errors"
"chain/log"
"chain/protocol"
"chain/protocol/vmutil"
)
const maxAccountCache = 100
var ErrDuplicateAlias = errors.New("duplicate account alias")
func NewManager(db *sql.DB, chain *protocol.Chain) *Manager {
return &Manager{
db: db,
chain: chain,
utxoDB: &utxodb.DBReserver{DB: db},
cache: lru.New(maxAccountCache),
}
}
// Manager stores accounts and their associated control programs.
type Manager struct {
db *sql.DB
chain *protocol.Chain
utxoDB *utxodb.DBReserver
indexer Saver
pinStore *pin.Store
cacheMu sync.Mutex
cache *lru.Cache
acpMu sync.Mutex
acpIndexNext uint64 // next acp index in our block
acpIndexCap uint64 // points to end of block
}
func (m *Manager) IndexAccounts(indexer Saver, pinStore *pin.Store) {
m.indexer = indexer
m.pinStore = pinStore
}
// ExpireReservations removes reservations that have expired periodically.
// It blocks until the context is canceled.
func (m *Manager) ExpireReservations(ctx context.Context, period time.Duration) {
ticks := time.Tick(period)
for {
select {
case <-ctx.Done():
log.Messagef(ctx, "Deposed, ExpireReservations exiting")
return
case <-ticks:
err := m.utxoDB.ExpireReservations(ctx)
if err != nil {
log.Error(ctx, err)
}
}
}
}
type Account struct {
*signers.Signer
Alias string
Tags map[string]interface{}
}
// Create creates a new Account.
func (m *Manager) Create(ctx context.Context, xpubs []string, quorum int, alias string, tags map[string]interface{}, clientToken *string) (*Account, error) {
signer, err := signers.Create(ctx, m.db, "account", xpubs, quorum, clientToken)
if err != nil {
return nil, errors.Wrap(err)
}
tagsParam, err := tagsToNullString(tags)
if err != nil {
return nil, err
}
aliasSQL := stdsql.NullString{
String: alias,
Valid: alias != "",
}
const q = `
INSERT INTO accounts (account_id, alias, tags) VALUES ($1, $2, $3)
ON CONFLICT (account_id) DO UPDATE SET alias = $2, tags = $3
`
_, err = m.db.Exec(ctx, q, signer.ID, aliasSQL, tagsParam)
if pg.IsUniqueViolation(err) {
return nil, errors.WithDetail(ErrDuplicateAlias, "an account with the provided alias already exists")
} else if err != nil {
return nil, errors.Wrap(err)
}
account := &Account{
Signer: signer,
Alias: alias,
Tags: tags,
}
err = m.indexAnnotatedAccount(ctx, account)
if err != nil {
return nil, errors.Wrap(err, "indexing annotated account")
}
return account, nil
}
// FindByAlias retrieves an account's Signer record by its alias
func (m *Manager) FindByAlias(ctx context.Context, alias string) (*signers.Signer, error) {
const q = `SELECT account_id FROM accounts WHERE alias=$1`
var accountID string
err := m.db.QueryRow(ctx, q, alias).Scan(&accountID)
if err == stdsql.ErrNoRows {
return nil, errors.WithDetailf(pg.ErrUserInputNotFound, "alias: %s", alias)
}
if err != nil {
return nil, errors.Wrap(err)
}
return m.findByID(ctx, accountID)
}
// findByID returns an account's Signer record by its ID.
func (m *Manager) findByID(ctx context.Context, id string) (*signers.Signer, error) {
m.cacheMu.Lock()
cached, ok := m.cache.Get(id)
m.cacheMu.Unlock()
if ok {
return cached.(*signers.Signer), nil
}
account, err := signers.Find(ctx, m.db, "account", id)
if err != nil {
return nil, err
}
m.cacheMu.Lock()
m.cache.Add(id, account)
m.cacheMu.Unlock()
return account, nil
}
// CreateControlProgram creates a control program
// that is tied to the Account and stores it in the database.
func (m *Manager) CreateControlProgram(ctx context.Context, accountID string, change bool) ([]byte, error) {
account, err := m.findByID(ctx, accountID)
if err != nil {
return nil, err
}
idx, err := m.nextIndex(ctx)
if err != nil {
return nil, err
}
path := signers.Path(account, signers.AccountKeySpace, idx)
derivedXPubs := chainkd.DeriveXPubs(account.XPubs, path)
derivedPKs := chainkd.XPubKeys(derivedXPubs)
control, err := vmutil.P2SPMultiSigProgram(derivedPKs, account.Quorum)
if err != nil {
return nil, err
}
err = m.insertAccountControlProgram(ctx, account.ID, idx, control, change)
if err != nil {
return nil, err
}
return control, nil
}
func (m *Manager) insertAccountControlProgram(ctx context.Context, accountID string, idx uint64, control []byte, change bool) error {
const q = `
INSERT INTO account_control_programs (signer_id, key_index, control_program, change)
VALUES($1, $2, $3, $4)
`
_, err := m.db.Exec(ctx, q, accountID, idx, control, change)
return errors.Wrap(err)
}
func (m *Manager) nextIndex(ctx context.Context) (uint64, error) {
m.acpMu.Lock()
defer m.acpMu.Unlock()
if m.acpIndexNext >= m.acpIndexCap {
var cap uint64
const incrby = 10000 // account_control_program_seq increments by 10,000
const q = `SELECT nextval('account_control_program_seq')`
err := m.db.QueryRow(ctx, q).Scan(&cap)
if err != nil {
return 0, errors.Wrap(err, "scan")
}
m.acpIndexCap = cap
m.acpIndexNext = cap - incrby
}
n := m.acpIndexNext
m.acpIndexNext++
return n, nil
}
func tagsToNullString(tags map[string]interface{}) (*stdsql.NullString, error) {
var tagsJSON []byte
if len(tags) != 0 {
var err error
tagsJSON, err = json.Marshal(tags)
if err != nil {
return nil, errors.Wrap(err)
}
}
return &stdsql.NullString{String: string(tagsJSON), Valid: len(tagsJSON) > 0}, nil
}