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core_wallet.go
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core_wallet.go
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// Copyright 2018 The Nakama Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"context"
"database/sql"
"encoding/json"
"fmt"
"strconv"
"strings"
"github.com/cockroachdb/cockroach-go/crdb"
"github.com/gofrs/uuid"
"github.com/lib/pq"
"github.com/pkg/errors"
"go.uber.org/zap"
)
// Not an API entity, only used to receive data from Lua environment.
type walletUpdate struct {
UserID uuid.UUID
Changeset map[string]interface{}
// Metadata is expected to be a valid JSON string already.
Metadata string
}
// Not an API entity, only used to send data to Lua environment.
type walletLedger struct {
ID string
UserID string
Changeset map[string]interface{}
Metadata map[string]interface{}
CreateTime int64
UpdateTime int64
}
func (w *walletLedger) GetID() string {
return w.ID
}
func (w *walletLedger) GetUserID() string {
return w.UserID
}
func (w *walletLedger) GetCreateTime() int64 {
return w.CreateTime
}
func (w *walletLedger) GetUpdateTime() int64 {
return w.UpdateTime
}
func (w *walletLedger) GetChangeset() map[string]interface{} {
return w.Changeset
}
func (w *walletLedger) GetMetadata() map[string]interface{} {
return w.Metadata
}
func UpdateWallets(ctx context.Context, logger *zap.Logger, db *sql.DB, updates []*walletUpdate, updateLedger bool) error {
if len(updates) == 0 {
return nil
}
params := make([]interface{}, 0, len(updates))
statements := make([]string, 0, len(updates))
for _, update := range updates {
params = append(params, update.UserID)
statements = append(statements, "$"+strconv.Itoa(len(params))+"::UUID")
}
query := "SELECT id, wallet FROM users WHERE id IN (" + strings.Join(statements, ",") + ")"
tx, err := db.BeginTx(ctx, nil)
if err != nil {
logger.Error("Could not begin database transaction.", zap.Error(err))
return err
}
if err = crdb.ExecuteInTx(ctx, tx, func() error {
// Select the wallets from the DB and decode them.
wallets := make(map[string]map[string]interface{}, len(updates))
rows, err := tx.QueryContext(ctx, query, params...)
if err != nil {
logger.Debug("Error retrieving user wallets.", zap.Error(err))
return err
}
for rows.Next() {
var id string
var wallet sql.NullString
err = rows.Scan(&id, &wallet)
if err != nil {
rows.Close()
logger.Debug("Error reading user wallets.", zap.Error(err))
return err
}
var walletMap map[string]interface{}
err = json.Unmarshal([]byte(wallet.String), &walletMap)
if err != nil {
rows.Close()
logger.Debug("Error converting user wallet.", zap.String("user_id", id), zap.Error(err))
return err
}
wallets[id] = walletMap
}
rows.Close()
// Prepare the set of wallet updates and ledger updates.
updatedWallets := make(map[string][]byte, len(updates))
if updateLedger {
statements = make([]string, 0, len(updates))
params = make([]interface{}, 0, len(updates)*4)
}
for _, update := range updates {
userID := update.UserID.String()
walletMap, ok := wallets[userID]
if !ok {
// Wallet update for a user that does not exist. Skip it.
continue
}
walletMap, err = applyWalletUpdate(walletMap, update.Changeset, "")
if err != nil {
// Programmer error, no need to log.
return err
}
walletData, err := json.Marshal(walletMap)
if err != nil {
logger.Debug("Error converting new user wallet.", zap.String("user_id", userID), zap.Error(err))
return err
}
updatedWallets[userID] = walletData
// Prepare ledger updates if needed.
if updateLedger {
changesetData, err := json.Marshal(update.Changeset)
if err != nil {
logger.Debug("Error converting new user wallet changeset.", zap.String("user_id", update.UserID.String()), zap.Error(err))
return err
}
params = append(params, uuid.Must(uuid.NewV4()), userID, changesetData, update.Metadata)
statements = append(statements, fmt.Sprintf("($%v::UUID, $%v, $%v, $%v)", strconv.Itoa(len(params)-3), strconv.Itoa(len(params)-2), strconv.Itoa(len(params)-1), strconv.Itoa(len(params))))
}
}
// Write the updated wallets.
query = "UPDATE users SET update_time = now(), wallet = $2 WHERE id = $1"
for userID, updatedWallet := range updatedWallets {
_, err = tx.ExecContext(ctx, query, userID, updatedWallet)
if err != nil {
logger.Debug("Error writing user wallet.", zap.String("user_id", userID), zap.Error(err))
return err
}
}
// Write the ledger updates, if any.
if updateLedger && (len(statements) > 0) {
query = "INSERT INTO wallet_ledger (id, user_id, changeset, metadata) VALUES " + strings.Join(statements, ", ")
_, err = tx.ExecContext(ctx, query, params...)
if err != nil {
logger.Debug("Error writing user wallet ledgers.", zap.Error(err))
return err
}
}
return nil
}); err != nil {
logger.Error("Error updating wallets.", zap.Error(err))
return err
}
return nil
}
func UpdateWalletLedger(ctx context.Context, logger *zap.Logger, db *sql.DB, id uuid.UUID, metadata string) (*walletLedger, error) {
// Metadata is expected to already be a valid JSON string.
var userId string
var changeset sql.NullString
var createTime pq.NullTime
var updateTime pq.NullTime
query := "UPDATE wallet_ledger SET update_time = now(), metadata = metadata || $2 WHERE id = $1::UUID RETURNING user_id, changeset, create_time, update_time"
err := db.QueryRowContext(ctx, query, id, metadata).Scan(&userId, &changeset, &createTime, &updateTime)
if err != nil {
logger.Error("Error updating user wallet ledger.", zap.String("id", id.String()), zap.Error(err))
return nil, err
}
var changesetMap map[string]interface{}
err = json.Unmarshal([]byte(changeset.String), &changesetMap)
if err != nil {
logger.Error("Error converting user wallet ledger changeset after update.", zap.String("id", id.String()), zap.Error(err))
return nil, err
}
return &walletLedger{
UserID: userId,
Changeset: changesetMap,
CreateTime: createTime.Time.Unix(),
UpdateTime: updateTime.Time.Unix(),
}, nil
}
func ListWalletLedger(ctx context.Context, logger *zap.Logger, db *sql.DB, userID uuid.UUID) ([]*walletLedger, error) {
results := make([]*walletLedger, 0)
query := "SELECT id, changeset, metadata, create_time, update_time FROM wallet_ledger WHERE user_id = $1::UUID"
rows, err := db.QueryContext(ctx, query, userID)
if err != nil {
logger.Error("Error retrieving user wallet ledger.", zap.String("user_id", userID.String()), zap.Error(err))
return nil, err
}
defer rows.Close()
for rows.Next() {
var id string
var changeset sql.NullString
var metadata sql.NullString
var createTime pq.NullTime
var updateTime pq.NullTime
err = rows.Scan(&id, &changeset, &metadata, &createTime, &updateTime)
if err != nil {
logger.Error("Error converting user wallet ledger.", zap.String("user_id", userID.String()), zap.Error(err))
return nil, err
}
var changesetMap map[string]interface{}
err = json.Unmarshal([]byte(changeset.String), &changesetMap)
if err != nil {
logger.Error("Error converting user wallet ledger changeset.", zap.String("user_id", userID.String()), zap.Error(err))
return nil, err
}
var metadataMap map[string]interface{}
err = json.Unmarshal([]byte(metadata.String), &metadataMap)
if err != nil {
logger.Error("Error converting user wallet ledger metadata.", zap.String("user_id", userID.String()), zap.Error(err))
return nil, err
}
results = append(results, &walletLedger{
ID: id,
Changeset: changesetMap,
Metadata: metadataMap,
CreateTime: createTime.Time.Unix(),
UpdateTime: updateTime.Time.Unix(),
})
}
return results, nil
}
func applyWalletUpdate(wallet map[string]interface{}, changeset map[string]interface{}, path string) (map[string]interface{}, error) {
for k, v := range changeset {
var currentPath string
if path == "" {
currentPath = k
} else {
currentPath = fmt.Sprintf("%v.%v", path, k)
}
if existing, ok := wallet[k]; ok {
// There is already a value present for this field.
if existingMap, ok := existing.(map[string]interface{}); ok {
// Ensure they're both maps of other values.
if changesetMap, ok := v.(map[string]interface{}); ok {
// Recurse to apply changes.
updated, err := applyWalletUpdate(existingMap, changesetMap, currentPath)
if err != nil {
return nil, err
}
wallet[k] = updated
} else {
return nil, errors.Errorf("update changeset does not match existing wallet value map type at path '%v'", currentPath)
}
} else if existingValue, ok := existing.(float64); ok {
// Ensure they're both numeric values.
if changesetValue, ok := v.(float64); ok {
newValue := existingValue + changesetValue
if newValue < 0 {
return nil, errors.Errorf("wallet update rejected negative value at path '%v'", currentPath)
}
wallet[k] = newValue
} else {
return nil, errors.Errorf("update changeset does not match existing wallet value number type at path '%v'", currentPath)
}
} else {
// Existing value is not a map or float.
return nil, errors.Errorf("unknown existing wallet value type at path '%v', expecting map or float64", currentPath)
}
} else {
// No existing value for this field.
if changesetMap, ok := v.(map[string]interface{}); ok {
updated, err := applyWalletUpdate(make(map[string]interface{}, 1), changesetMap, currentPath)
if err != nil {
return nil, err
}
wallet[k] = updated
} else if changesetValue, ok := v.(float64); ok {
if changesetValue < 0 {
// Do not allow setting negative initial values.
return nil, errors.Errorf("wallet update rejected negative value at path '%v'", currentPath)
}
wallet[k] = changesetValue
} else {
// Incoming value is not a map or float.
return nil, errors.Errorf("unknown update changeset value type at path '%v', expecting map or float64", currentPath)
}
}
}
return wallet, nil
}