270 lines
8.7 KiB
Go
270 lines
8.7 KiB
Go
package plan
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/shopspring/decimal"
|
|
"github.com/tech/sendico/payments/storage/model"
|
|
"github.com/tech/sendico/pkg/merrors"
|
|
"github.com/tech/sendico/pkg/mlogger"
|
|
paymenttypes "github.com/tech/sendico/pkg/payments/types"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
func ensureGatewayForAction(ctx context.Context, logger mlogger.Logger, registry GatewayRegistry, cache map[model.Rail]*model.GatewayInstanceDescriptor, rail model.Rail, network string, amount *paymenttypes.Money, action model.RailOperation, instanceID string, dir sendDirection) (*model.GatewayInstanceDescriptor, error) {
|
|
if registry == nil {
|
|
return nil, merrors.InvalidArgument("plan builder: gateway registry is required")
|
|
}
|
|
if gw, ok := cache[rail]; ok && gw != nil {
|
|
if instanceID == "" || strings.EqualFold(gw.InstanceID, instanceID) {
|
|
if err := validateGatewayAction(gw, network, amount, action, dir); err != nil {
|
|
logger.Warn("Failed to validate gateway", zap.Error(err),
|
|
zap.String("instance_id", instanceID), zap.String("rail", string(rail)),
|
|
zap.String("network", network), zap.String("action", string(action)),
|
|
zap.String("direction", sendDirectionLabel(dir)), zap.Int("rails_qty", len(cache)),
|
|
)
|
|
return nil, err
|
|
}
|
|
return gw, nil
|
|
}
|
|
}
|
|
gw, err := selectGateway(ctx, registry, rail, network, amount, action, instanceID, dir)
|
|
if err != nil {
|
|
logger.Warn("Failed to select gateway", zap.Error(err),
|
|
zap.String("instance_id", instanceID), zap.String("rail", string(rail)),
|
|
zap.String("network", network), zap.String("action", string(action)),
|
|
zap.String("direction", sendDirectionLabel(dir)), zap.Int("rails_qty", len(cache)),
|
|
)
|
|
return nil, err
|
|
}
|
|
cache[rail] = gw
|
|
return gw, nil
|
|
}
|
|
|
|
func validateGatewayAction(gw *model.GatewayInstanceDescriptor, network string, amount *paymenttypes.Money, action model.RailOperation, dir sendDirection) error {
|
|
if gw == nil {
|
|
return merrors.InvalidArgument("plan builder: gateway instance is required")
|
|
}
|
|
currency := ""
|
|
amt := decimal.Zero
|
|
if amount != nil && strings.TrimSpace(amount.GetAmount()) != "" {
|
|
value, err := decimalFromMoney(amount)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
amt = value
|
|
currency = strings.ToUpper(strings.TrimSpace(amount.GetCurrency()))
|
|
}
|
|
if err := isGatewayEligible(gw, gw.Rail, network, currency, action, dir, amt); err != nil {
|
|
return merrors.InvalidArgument("plan builder: gateway instance is not eligible: " + err.Error())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type sendDirection int
|
|
|
|
const (
|
|
sendDirectionAny sendDirection = iota
|
|
sendDirectionOut
|
|
sendDirectionIn
|
|
)
|
|
|
|
func sendDirectionForRail(rail model.Rail) sendDirection {
|
|
switch rail {
|
|
case model.RailFiatOnRamp:
|
|
return sendDirectionIn
|
|
default:
|
|
return sendDirectionOut
|
|
}
|
|
}
|
|
|
|
func selectGateway(ctx context.Context, registry GatewayRegistry, rail model.Rail, network string, amount *paymenttypes.Money, action model.RailOperation, instanceID string, dir sendDirection) (*model.GatewayInstanceDescriptor, error) {
|
|
if registry == nil {
|
|
return nil, merrors.InvalidArgument("plan builder: gateway registry is required")
|
|
}
|
|
all, err := registry.List(ctx)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if len(all) == 0 {
|
|
return nil, merrors.InvalidArgument("plan builder: no gateway instances available")
|
|
}
|
|
|
|
currency := ""
|
|
amt := decimal.Zero
|
|
if amount != nil && strings.TrimSpace(amount.GetAmount()) != "" {
|
|
amt, err = decimalFromMoney(amount)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
currency = strings.ToUpper(strings.TrimSpace(amount.GetCurrency()))
|
|
}
|
|
network = strings.ToUpper(strings.TrimSpace(network))
|
|
|
|
eligible := make([]*model.GatewayInstanceDescriptor, 0)
|
|
var lastErr error
|
|
for _, gw := range all {
|
|
if instanceID != "" && !strings.EqualFold(strings.TrimSpace(gw.InstanceID), instanceID) {
|
|
continue
|
|
}
|
|
if err := isGatewayEligible(gw, rail, network, currency, action, dir, amt); err != nil {
|
|
lastErr = err
|
|
continue
|
|
}
|
|
eligible = append(eligible, gw)
|
|
}
|
|
if len(eligible) == 0 {
|
|
if lastErr != nil {
|
|
return nil, merrors.InvalidArgument("plan builder: no eligible gateway instance found, last error: " + lastErr.Error())
|
|
}
|
|
return nil, merrors.InvalidArgument("plan builder: no eligible gateway instance found")
|
|
}
|
|
sort.Slice(eligible, func(i, j int) bool {
|
|
return eligible[i].ID < eligible[j].ID
|
|
})
|
|
return eligible[0], nil
|
|
}
|
|
|
|
type gatewayIneligibleError struct {
|
|
reason string
|
|
}
|
|
|
|
func (e gatewayIneligibleError) Error() string {
|
|
return e.reason
|
|
}
|
|
|
|
func gatewayIneligible(gw *model.GatewayInstanceDescriptor, reason string) error {
|
|
if strings.TrimSpace(reason) == "" {
|
|
reason = "gateway instance is not eligible"
|
|
}
|
|
return gatewayIneligibleError{reason: fmt.Sprintf("gateway %s eligibility check error: %s", gw.InstanceID, reason)}
|
|
}
|
|
|
|
func sendDirectionLabel(dir sendDirection) string {
|
|
switch dir {
|
|
case sendDirectionOut:
|
|
return "out"
|
|
case sendDirectionIn:
|
|
return "in"
|
|
default:
|
|
return "any"
|
|
}
|
|
}
|
|
|
|
func isGatewayEligible(gw *model.GatewayInstanceDescriptor, rail model.Rail, network, currency string, action model.RailOperation, dir sendDirection, amount decimal.Decimal) error {
|
|
if gw == nil {
|
|
return gatewayIneligible(gw, "gateway instance is required")
|
|
}
|
|
if !gw.IsEnabled {
|
|
return gatewayIneligible(gw, "gateway instance is disabled")
|
|
}
|
|
if gw.Rail != rail {
|
|
return gatewayIneligible(gw, fmt.Sprintf("rail mismatch: want %s got %s", rail, gw.Rail))
|
|
}
|
|
if network != "" && gw.Network != "" && !strings.EqualFold(gw.Network, network) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("network mismatch: want %s got %s", network, gw.Network))
|
|
}
|
|
if currency != "" && len(gw.Currencies) > 0 {
|
|
found := false
|
|
for _, c := range gw.Currencies {
|
|
if strings.EqualFold(c, currency) {
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
if !found {
|
|
return gatewayIneligible(gw, "currency not supported: "+currency)
|
|
}
|
|
}
|
|
|
|
if !capabilityAllowsAction(gw.Capabilities, action, dir) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("capability does not allow action=%s dir=%s", action, sendDirectionLabel(dir)))
|
|
}
|
|
|
|
if currency != "" {
|
|
if err := amountWithinLimits(gw, gw.Limits, currency, amount, action); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func capabilityAllowsAction(cap model.RailCapabilities, action model.RailOperation, dir sendDirection) bool {
|
|
switch action {
|
|
case model.RailOperationSend:
|
|
switch dir {
|
|
case sendDirectionOut:
|
|
return cap.CanPayOut
|
|
case sendDirectionIn:
|
|
return cap.CanPayIn
|
|
default:
|
|
return cap.CanPayIn || cap.CanPayOut
|
|
}
|
|
case model.RailOperationFee:
|
|
return cap.CanSendFee
|
|
case model.RailOperationObserveConfirm:
|
|
return cap.RequiresObserveConfirm
|
|
case model.RailOperationBlock:
|
|
return cap.CanBlock
|
|
case model.RailOperationRelease:
|
|
return cap.CanRelease
|
|
default:
|
|
return true
|
|
}
|
|
}
|
|
|
|
func amountWithinLimits(gw *model.GatewayInstanceDescriptor, limits model.Limits, currency string, amount decimal.Decimal, action model.RailOperation) error {
|
|
min := firstLimitValue(limits.MinAmount, "")
|
|
max := firstLimitValue(limits.MaxAmount, "")
|
|
perTxMin := firstLimitValue(limits.PerTxMinAmount, "")
|
|
perTxMax := firstLimitValue(limits.PerTxMaxAmount, "")
|
|
maxFee := firstLimitValue(limits.PerTxMaxFee, "")
|
|
|
|
if override, ok := limits.CurrencyLimits[currency]; ok {
|
|
min = firstLimitValue(override.MinAmount, min)
|
|
max = firstLimitValue(override.MaxAmount, max)
|
|
if action == model.RailOperationFee {
|
|
maxFee = firstLimitValue(override.MaxFee, maxFee)
|
|
}
|
|
}
|
|
|
|
if min != "" {
|
|
if val, err := decimal.NewFromString(min); err == nil && amount.LessThan(val) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("amount %s %s below min limit %s", amount.String(), currency, val.String()))
|
|
}
|
|
}
|
|
if perTxMin != "" {
|
|
if val, err := decimal.NewFromString(perTxMin); err == nil && amount.LessThan(val) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("amount %s %s below per-tx min limit %s", amount.String(), currency, val.String()))
|
|
}
|
|
}
|
|
if max != "" {
|
|
if val, err := decimal.NewFromString(max); err == nil && amount.GreaterThan(val) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("amount %s %s exceeds max limit %s", amount.String(), currency, val.String()))
|
|
}
|
|
}
|
|
if perTxMax != "" {
|
|
if val, err := decimal.NewFromString(perTxMax); err == nil && amount.GreaterThan(val) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("amount %s %s exceeds per-tx max limit %s", amount.String(), currency, val.String()))
|
|
}
|
|
}
|
|
if action == model.RailOperationFee && maxFee != "" {
|
|
if val, err := decimal.NewFromString(maxFee); err == nil && amount.GreaterThan(val) {
|
|
return gatewayIneligible(gw, fmt.Sprintf("fee amount %s %s exceeds max fee limit %s", amount.String(), currency, val.String()))
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func firstLimitValue(primary, fallback string) string {
|
|
val := strings.TrimSpace(primary)
|
|
if val != "" {
|
|
return val
|
|
}
|
|
return strings.TrimSpace(fallback)
|
|
}
|