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jeffyanta
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Add balance checkpoint store (#46)
* Add balance checkpoint store * Add comments to balance store
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9 files changed

+527
-0
lines changed

9 files changed

+527
-0
lines changed

‎pkg/code/data/balance/checkpoint.go‎

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package balance
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import (
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"errors"
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"time"
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)
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// Note: Only supports external balances
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type Record struct {
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Id uint64
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TokenAccount string
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Quarks uint64
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SlotCheckpoint uint64
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LastUpdatedAt time.Time
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}
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func (r *Record) Validate() error {
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if len(r.TokenAccount) == 0 {
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return errors.New("token account is required")
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}
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return nil
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}
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func (r *Record) Clone() Record {
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return Record{
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Id: r.Id,
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TokenAccount: r.TokenAccount,
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Quarks: r.Quarks,
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SlotCheckpoint: r.SlotCheckpoint,
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LastUpdatedAt: r.LastUpdatedAt,
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}
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}
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func (r *Record) CopyTo(dst *Record) {
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dst.Id = r.Id
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dst.TokenAccount = r.TokenAccount
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dst.Quarks = r.Quarks
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dst.SlotCheckpoint = r.SlotCheckpoint
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dst.LastUpdatedAt = r.LastUpdatedAt
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}

‎pkg/code/data/balance/memory/store.go‎

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package memory
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import (
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"context"
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"sync"
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"time"
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"github.com/code-payments/code-server/pkg/code/data/balance"
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)
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type store struct {
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mu sync.Mutex
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records []*balance.Record
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last uint64
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}
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// New returns a new in memory balance.Store
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func New() balance.Store {
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return &store{}
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}
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// SaveCheckpoint implements balance.Store.SaveCheckpoint
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func (s *store) SaveCheckpoint(_ context.Context, data *balance.Record) error {
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if err := data.Validate(); err != nil {
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return err
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}
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s.mu.Lock()
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defer s.mu.Unlock()
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s.last++
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if item := s.find(data); item != nil {
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if data.SlotCheckpoint <= item.SlotCheckpoint {
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return balance.ErrStaleCheckpoint
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}
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item.SlotCheckpoint = data.SlotCheckpoint
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item.Quarks = data.Quarks
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item.LastUpdatedAt = time.Now()
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item.CopyTo(data)
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} else {
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if data.Id == 0 {
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data.Id = s.last
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}
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data.LastUpdatedAt = time.Now()
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c := data.Clone()
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s.records = append(s.records, &c)
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}
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return nil
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}
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// GetCheckpoint implements balance.Store.GetCheckpoint
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func (s *store) GetCheckpoint(_ context.Context, account string) (*balance.Record, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if item := s.findByTokenAccount(account); item != nil {
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cloned := item.Clone()
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return &cloned, nil
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}
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return nil, balance.ErrCheckpointNotFound
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}
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func (s *store) find(data *balance.Record) *balance.Record {
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for _, item := range s.records {
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if item.Id == data.Id {
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return item
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}
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if data.TokenAccount == item.TokenAccount {
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return item
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}
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}
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return nil
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}
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func (s *store) findByTokenAccount(account string) *balance.Record {
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for _, item := range s.records {
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if account == item.TokenAccount {
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return item
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}
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}
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return nil
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}
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func (s *store) reset() {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.records = nil
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s.last = 0
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}

‎pkg/code/data/balance/memory/store_test.go‎

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package memory
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import (
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"testing"
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"github.com/code-payments/code-server/pkg/code/data/balance/tests"
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)
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func TestBalanceMemoryStore(t *testing.T) {
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testStore := New()
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teardown := func() {
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testStore.(*store).reset()
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}
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tests.RunTests(t, testStore, teardown)
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}

‎pkg/code/data/balance/postgres/model.go‎

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package postgres
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import (
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"context"
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"database/sql"
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"time"
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"github.com/jmoiron/sqlx"
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"github.com/code-payments/code-server/pkg/code/data/balance"
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pgutil "github.com/code-payments/code-server/pkg/database/postgres"
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)
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const (
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tableName = "codewallet__core_balancecheckpoint"
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)
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type model struct {
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Id sql.NullInt64 `db:"id"`
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TokenAccount string `db:"token_account"`
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Quarks uint64 `db:"quarks"`
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SlotCheckpoint uint64 `db:"slot_checkpoint"`
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LastUpdatedAt time.Time `db:"last_updated_at"`
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}
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func toModel(obj *balance.Record) (*model, error) {
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if err := obj.Validate(); err != nil {
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return nil, err
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}
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return &model{
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TokenAccount: obj.TokenAccount,
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Quarks: obj.Quarks,
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SlotCheckpoint: obj.SlotCheckpoint,
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LastUpdatedAt: obj.LastUpdatedAt,
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}, nil
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}
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func fromModel(obj *model) *balance.Record {
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return &balance.Record{
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Id: uint64(obj.Id.Int64),
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TokenAccount: obj.TokenAccount,
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Quarks: obj.Quarks,
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SlotCheckpoint: obj.SlotCheckpoint,
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LastUpdatedAt: obj.LastUpdatedAt,
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}
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}
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func (m *model) dbSave(ctx context.Context, db *sqlx.DB) error {
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return pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
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query := `INSERT INTO ` + tableName + `
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(token_account, quarks, slot_checkpoint, last_updated_at)
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VALUES ($1, $2, $3, $4)
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ON CONFLICT (token_account)
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DO UPDATE
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SET quarks = $2, slot_checkpoint = $3, last_updated_at = $4
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WHERE ` + tableName + `.token_account = $1 AND ` + tableName + `.slot_checkpoint < $3
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RETURNING
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id, token_account, quarks, slot_checkpoint, last_updated_at`
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m.LastUpdatedAt = time.Now()
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err := tx.QueryRowxContext(
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ctx,
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query,
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m.TokenAccount,
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m.Quarks,
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m.SlotCheckpoint,
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m.LastUpdatedAt.UTC(),
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).StructScan(m)
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return pgutil.CheckNoRows(err, balance.ErrStaleCheckpoint)
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})
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}
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func dbGetCheckpoint(ctx context.Context, db *sqlx.DB, account string) (*model, error) {
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res := &model{}
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query := `SELECT
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id, token_account, quarks, slot_checkpoint, last_updated_at
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FROM ` + tableName + `
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WHERE token_account = $1
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LIMIT 1`
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err := db.GetContext(ctx, res, query, account)
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if err != nil {
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return nil, pgutil.CheckNoRows(err, balance.ErrCheckpointNotFound)
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}
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return res, nil
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}

‎pkg/code/data/balance/postgres/store.go‎

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package postgres
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import (
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"context"
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"database/sql"
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"github.com/jmoiron/sqlx"
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"github.com/code-payments/code-server/pkg/code/data/balance"
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)
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type store struct {
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db *sqlx.DB
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}
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// New returns a new postgres balance.Store
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func New(db *sql.DB) balance.Store {
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return &store{
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db: sqlx.NewDb(db, "pgx"),
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}
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}
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// SaveCheckpoint implements balance.Store.SaveCheckpoint
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func (s *store) SaveCheckpoint(ctx context.Context, record *balance.Record) error {
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model, err := toModel(record)
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if err != nil {
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return err
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}
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if err := model.dbSave(ctx, s.db); err != nil {
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return err
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}
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res := fromModel(model)
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res.CopyTo(record)
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return nil
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}
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// GetCheckpoint implements balance.Store.GetCheckpoint
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func (s *store) GetCheckpoint(ctx context.Context, account string) (*balance.Record, error) {
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model, err := dbGetCheckpoint(ctx, s.db, account)
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if err != nil {
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return nil, err
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}
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return fromModel(model), nil
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}

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