724 lines
20 KiB
Go
724 lines
20 KiB
Go
package router
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import (
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"context"
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"errors"
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"math"
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"math/big"
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"sort"
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"strings"
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"sync"
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"github.com/ethereum/go-ethereum"
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"github.com/ethereum/go-ethereum/accounts/abi"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/status-im/status-go/contracts"
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gaspriceoracle "github.com/status-im/status-go/contracts/gas-price-oracle"
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"github.com/status-im/status-go/contracts/ierc20"
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"github.com/status-im/status-go/params"
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"github.com/status-im/status-go/rpc"
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"github.com/status-im/status-go/services/ens"
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"github.com/status-im/status-go/services/stickers"
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"github.com/status-im/status-go/services/wallet/async"
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"github.com/status-im/status-go/services/wallet/bigint"
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"github.com/status-im/status-go/services/wallet/collectibles"
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walletCommon "github.com/status-im/status-go/services/wallet/common"
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"github.com/status-im/status-go/services/wallet/market"
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"github.com/status-im/status-go/services/wallet/router/pathprocessor"
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"github.com/status-im/status-go/services/wallet/token"
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walletToken "github.com/status-im/status-go/services/wallet/token"
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"github.com/status-im/status-go/transactions"
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)
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// //////////////////////////////////////////////////////////////////////////////
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// TODO: once new router is in place, remove this `router.go` file,
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// rename and make `router_v2.go` file the main and only file
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// //////////////////////////////////////////////////////////////////////////////
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// TODO: remove the following two consts once we fully move to routerV2
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const EstimateUsername = "RandomUsername"
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const EstimatePubKey = "0x04bb2024ce5d72e45d4a4f8589ae657ef9745855006996115a23a1af88d536cf02c0524a585fce7bfa79d6a9669af735eda6205d6c7e5b3cdc2b8ff7b2fa1f0b56"
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type Path struct {
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BridgeName string
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From *params.Network
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To *params.Network
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MaxAmountIn *hexutil.Big
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AmountIn *hexutil.Big
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AmountInLocked bool
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AmountOut *hexutil.Big
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GasAmount uint64
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GasFees *SuggestedFeesGwei
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BonderFees *hexutil.Big
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TokenFees *big.Float
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Cost *big.Float
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EstimatedTime TransactionEstimation
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ApprovalRequired bool
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ApprovalGasFees *big.Float
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ApprovalAmountRequired *hexutil.Big
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ApprovalContractAddress *common.Address
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}
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func (p *Path) Equal(o *Path) bool {
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return p.From.ChainID == o.From.ChainID && p.To.ChainID == o.To.ChainID
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}
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type Graph = []*Node
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type Node struct {
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Path *Path
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Children Graph
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}
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func newNode(path *Path) *Node {
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return &Node{Path: path, Children: make(Graph, 0)}
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}
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func buildGraph(AmountIn *big.Int, routes []*Path, level int, sourceChainIDs []uint64) Graph {
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graph := make(Graph, 0)
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for _, route := range routes {
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found := false
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for _, chainID := range sourceChainIDs {
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if chainID == route.From.ChainID {
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found = true
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break
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}
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}
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if found {
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continue
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}
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node := newNode(route)
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newRoutes := make([]*Path, 0)
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for _, r := range routes {
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if route.Equal(r) {
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continue
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}
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newRoutes = append(newRoutes, r)
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}
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newAmountIn := new(big.Int).Sub(AmountIn, route.MaxAmountIn.ToInt())
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if newAmountIn.Sign() > 0 {
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newSourceChainIDs := make([]uint64, len(sourceChainIDs))
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copy(newSourceChainIDs, sourceChainIDs)
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newSourceChainIDs = append(newSourceChainIDs, route.From.ChainID)
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node.Children = buildGraph(newAmountIn, newRoutes, level+1, newSourceChainIDs)
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if len(node.Children) == 0 {
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continue
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}
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}
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graph = append(graph, node)
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}
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return graph
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}
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func (n Node) buildAllRoutes() [][]*Path {
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res := make([][]*Path, 0)
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if len(n.Children) == 0 && n.Path != nil {
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res = append(res, []*Path{n.Path})
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}
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for _, node := range n.Children {
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for _, route := range node.buildAllRoutes() {
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extendedRoute := route
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if n.Path != nil {
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extendedRoute = append([]*Path{n.Path}, route...)
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}
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res = append(res, extendedRoute)
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}
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}
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return res
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}
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func filterRoutes(routes [][]*Path, amountIn *big.Int, fromLockedAmount map[uint64]*hexutil.Big) [][]*Path {
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if len(fromLockedAmount) == 0 {
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return routes
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}
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filteredRoutesLevel1 := make([][]*Path, 0)
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for _, route := range routes {
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routeOk := true
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fromIncluded := make(map[uint64]bool)
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fromExcluded := make(map[uint64]bool)
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for chainID, amount := range fromLockedAmount {
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if amount.ToInt().Cmp(pathprocessor.ZeroBigIntValue) == 0 {
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fromExcluded[chainID] = false
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} else {
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fromIncluded[chainID] = false
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}
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}
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for _, path := range route {
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if _, ok := fromExcluded[path.From.ChainID]; ok {
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routeOk = false
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break
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}
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if _, ok := fromIncluded[path.From.ChainID]; ok {
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fromIncluded[path.From.ChainID] = true
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}
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}
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for _, value := range fromIncluded {
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if !value {
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routeOk = false
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break
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}
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}
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if routeOk {
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filteredRoutesLevel1 = append(filteredRoutesLevel1, route)
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}
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}
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filteredRoutesLevel2 := make([][]*Path, 0)
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for _, route := range filteredRoutesLevel1 {
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routeOk := true
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for _, path := range route {
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if amount, ok := fromLockedAmount[path.From.ChainID]; ok {
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requiredAmountIn := new(big.Int).Sub(amountIn, amount.ToInt())
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restAmountIn := big.NewInt(0)
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for _, otherPath := range route {
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if path.Equal(otherPath) {
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continue
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}
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restAmountIn = new(big.Int).Add(otherPath.MaxAmountIn.ToInt(), restAmountIn)
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}
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if restAmountIn.Cmp(requiredAmountIn) >= 0 {
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path.AmountIn = amount
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path.AmountInLocked = true
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} else {
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routeOk = false
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break
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}
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}
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}
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if routeOk {
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filteredRoutesLevel2 = append(filteredRoutesLevel2, route)
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}
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}
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return filteredRoutesLevel2
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}
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func findBest(routes [][]*Path) []*Path {
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var best []*Path
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bestCost := big.NewFloat(math.Inf(1))
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for _, route := range routes {
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currentCost := big.NewFloat(0)
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for _, path := range route {
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currentCost = new(big.Float).Add(currentCost, path.Cost)
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}
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if currentCost.Cmp(bestCost) == -1 {
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best = route
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bestCost = currentCost
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}
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}
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return best
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}
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type SuggestedRoutes struct {
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Best []*Path
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Candidates []*Path
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TokenPrice float64
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NativeChainTokenPrice float64
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}
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func newSuggestedRoutes(
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amountIn *big.Int,
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candidates []*Path,
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fromLockedAmount map[uint64]*hexutil.Big,
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) *SuggestedRoutes {
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if len(candidates) == 0 {
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return &SuggestedRoutes{
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Candidates: candidates,
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Best: candidates,
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}
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}
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node := &Node{
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Path: nil,
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Children: buildGraph(amountIn, candidates, 0, []uint64{}),
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}
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routes := node.buildAllRoutes()
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routes = filterRoutes(routes, amountIn, fromLockedAmount)
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best := findBest(routes)
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if len(best) > 0 {
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sort.Slice(best, func(i, j int) bool {
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return best[i].AmountInLocked
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})
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rest := new(big.Int).Set(amountIn)
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for _, path := range best {
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diff := new(big.Int).Sub(rest, path.MaxAmountIn.ToInt())
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if diff.Cmp(pathprocessor.ZeroBigIntValue) >= 0 {
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path.AmountIn = (*hexutil.Big)(path.MaxAmountIn.ToInt())
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} else {
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path.AmountIn = (*hexutil.Big)(new(big.Int).Set(rest))
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}
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rest.Sub(rest, path.AmountIn.ToInt())
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}
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}
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return &SuggestedRoutes{
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Candidates: candidates,
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Best: best,
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}
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}
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func NewRouter(rpcClient *rpc.Client, transactor *transactions.Transactor, tokenManager *token.Manager, marketManager *market.Manager,
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collectibles *collectibles.Service, collectiblesManager *collectibles.Manager, ensService *ens.Service, stickersService *stickers.Service) *Router {
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processors := make(map[string]pathprocessor.PathProcessor)
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return &Router{
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rpcClient: rpcClient,
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tokenManager: tokenManager,
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marketManager: marketManager,
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collectiblesService: collectibles,
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collectiblesManager: collectiblesManager,
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ensService: ensService,
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stickersService: stickersService,
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feesManager: &FeeManager{rpcClient},
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pathProcessors: processors,
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}
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}
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func (r *Router) AddPathProcessor(processor pathprocessor.PathProcessor) {
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r.pathProcessors[processor.Name()] = processor
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}
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func (r *Router) GetFeesManager() *FeeManager {
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return r.feesManager
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}
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func (r *Router) GetPathProcessors() map[string]pathprocessor.PathProcessor {
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return r.pathProcessors
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}
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func containsNetworkChainID(network *params.Network, chainIDs []uint64) bool {
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for _, chainID := range chainIDs {
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if chainID == network.ChainID {
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return true
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}
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}
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return false
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}
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type Router struct {
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rpcClient *rpc.Client
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tokenManager *token.Manager
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marketManager *market.Manager
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collectiblesService *collectibles.Service
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collectiblesManager *collectibles.Manager
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ensService *ens.Service
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stickersService *stickers.Service
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feesManager *FeeManager
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pathProcessors map[string]pathprocessor.PathProcessor
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}
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func (r *Router) requireApproval(ctx context.Context, sendType SendType, approvalContractAddress *common.Address, params pathprocessor.ProcessorInputParams) (
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bool, *big.Int, uint64, uint64, error) {
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if sendType.IsCollectiblesTransfer() || sendType.IsEnsTransfer() || sendType.IsStickersTransfer() {
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return false, nil, 0, 0, nil
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}
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if params.FromToken.IsNative() {
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return false, nil, 0, 0, nil
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}
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contractMaker, err := contracts.NewContractMaker(r.rpcClient)
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if err != nil {
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return false, nil, 0, 0, err
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}
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contract, err := contractMaker.NewERC20(params.FromChain.ChainID, params.FromToken.Address)
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if err != nil {
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return false, nil, 0, 0, err
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}
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if approvalContractAddress == nil || *approvalContractAddress == pathprocessor.ZeroAddress {
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return false, nil, 0, 0, nil
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}
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|
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if params.TestsMode {
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return true, params.AmountIn, params.TestApprovalGasEstimation, params.TestApprovalL1Fee, nil
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}
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allowance, err := contract.Allowance(&bind.CallOpts{
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Context: ctx,
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}, params.FromAddr, *approvalContractAddress)
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|
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if err != nil {
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return false, nil, 0, 0, err
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}
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|
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if allowance.Cmp(params.AmountIn) >= 0 {
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return false, nil, 0, 0, nil
|
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}
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|
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ethClient, err := r.rpcClient.EthClient(params.FromChain.ChainID)
|
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if err != nil {
|
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return false, nil, 0, 0, err
|
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}
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|
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erc20ABI, err := abi.JSON(strings.NewReader(ierc20.IERC20ABI))
|
|
if err != nil {
|
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return false, nil, 0, 0, err
|
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}
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|
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data, err := erc20ABI.Pack("approve", approvalContractAddress, params.AmountIn)
|
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if err != nil {
|
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return false, nil, 0, 0, err
|
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}
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|
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estimate, err := ethClient.EstimateGas(context.Background(), ethereum.CallMsg{
|
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From: params.FromAddr,
|
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To: ¶ms.FromToken.Address,
|
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Value: pathprocessor.ZeroBigIntValue,
|
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Data: data,
|
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})
|
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if err != nil {
|
|
return false, nil, 0, 0, err
|
|
}
|
|
|
|
// fetching l1 fee
|
|
var l1Fee uint64
|
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oracleContractAddress, err := gaspriceoracle.ContractAddress(params.FromChain.ChainID)
|
|
if err == nil {
|
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oracleContract, err := gaspriceoracle.NewGaspriceoracleCaller(oracleContractAddress, ethClient)
|
|
if err != nil {
|
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return false, nil, 0, 0, err
|
|
}
|
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|
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callOpt := &bind.CallOpts{}
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|
|
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l1FeeResult, _ := oracleContract.GetL1Fee(callOpt, data)
|
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l1Fee = l1FeeResult.Uint64()
|
|
}
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|
|
return true, params.AmountIn, estimate, l1Fee, nil
|
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}
|
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|
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func (r *Router) getBalance(ctx context.Context, network *params.Network, token *token.Token, account common.Address) (*big.Int, error) {
|
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client, err := r.rpcClient.EthClient(network.ChainID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
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return r.tokenManager.GetBalance(ctx, client, account, token.Address)
|
|
}
|
|
|
|
func (r *Router) getERC1155Balance(ctx context.Context, network *params.Network, token *token.Token, account common.Address) (*big.Int, error) {
|
|
tokenID, success := new(big.Int).SetString(token.Symbol, 10)
|
|
if !success {
|
|
return nil, errors.New("failed to convert token symbol to big.Int")
|
|
}
|
|
|
|
balances, err := r.collectiblesManager.FetchERC1155Balances(
|
|
ctx,
|
|
account,
|
|
walletCommon.ChainID(network.ChainID),
|
|
token.Address,
|
|
[]*bigint.BigInt{&bigint.BigInt{Int: tokenID}},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(balances) != 1 || balances[0] == nil {
|
|
return nil, errors.New("invalid ERC1155 balance fetch response")
|
|
}
|
|
|
|
return balances[0].Int, nil
|
|
}
|
|
|
|
func (r *Router) SuggestedRoutes(
|
|
ctx context.Context,
|
|
sendType SendType,
|
|
addrFrom common.Address,
|
|
addrTo common.Address,
|
|
amountIn *big.Int,
|
|
tokenID string,
|
|
toTokenID string,
|
|
disabledFromChainIDs,
|
|
disabledToChainIDs,
|
|
preferedChainIDs []uint64,
|
|
gasFeeMode GasFeeMode,
|
|
fromLockedAmount map[uint64]*hexutil.Big,
|
|
testnetMode bool,
|
|
) (*SuggestedRoutes, error) {
|
|
|
|
networks, err := r.rpcClient.NetworkManager.Get(false)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
prices, err := sendType.FetchPrices(r.marketManager, tokenID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var (
|
|
group = async.NewAtomicGroup(ctx)
|
|
mu sync.Mutex
|
|
candidates = make([]*Path, 0)
|
|
)
|
|
|
|
for networkIdx := range networks {
|
|
network := networks[networkIdx]
|
|
if network.IsTest != testnetMode {
|
|
continue
|
|
}
|
|
|
|
if containsNetworkChainID(network, disabledFromChainIDs) {
|
|
continue
|
|
}
|
|
|
|
if !sendType.isAvailableFor(network) {
|
|
continue
|
|
}
|
|
|
|
token := sendType.FindToken(r.tokenManager, r.collectiblesService, addrFrom, network, tokenID)
|
|
if token == nil {
|
|
continue
|
|
}
|
|
|
|
var toToken *walletToken.Token
|
|
if sendType == Swap {
|
|
toToken = sendType.FindToken(r.tokenManager, r.collectiblesService, common.Address{}, network, toTokenID)
|
|
}
|
|
|
|
nativeToken := r.tokenManager.FindToken(network, network.NativeCurrencySymbol)
|
|
if nativeToken == nil {
|
|
continue
|
|
}
|
|
|
|
group.Add(func(c context.Context) error {
|
|
gasFees, err := r.feesManager.SuggestedFeesGwei(ctx, network.ChainID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Default value is 1 as in case of erc721 as we built the token we are sure the account owns it
|
|
balance := big.NewInt(1)
|
|
if sendType == ERC1155Transfer {
|
|
balance, err = r.getERC1155Balance(ctx, network, token, addrFrom)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
} else if sendType != ERC721Transfer {
|
|
balance, err = r.getBalance(ctx, network, token, addrFrom)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
maxAmountIn := (*hexutil.Big)(balance)
|
|
if amount, ok := fromLockedAmount[network.ChainID]; ok {
|
|
if amount.ToInt().Cmp(balance) == 1 {
|
|
return errors.New("locked amount cannot be bigger than balance")
|
|
}
|
|
maxAmountIn = amount
|
|
}
|
|
|
|
nativeBalance, err := r.getBalance(ctx, network, nativeToken, addrFrom)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
maxFees := gasFees.feeFor(gasFeeMode)
|
|
|
|
estimatedTime := r.feesManager.TransactionEstimatedTime(ctx, network.ChainID, gweiToWei(maxFees))
|
|
for _, pProcessor := range r.pathProcessors {
|
|
// Skip processors that are added because of the Router V2, to not break the current functionality
|
|
if pProcessor.Name() == pathprocessor.ProcessorENSRegisterName ||
|
|
pProcessor.Name() == pathprocessor.ProcessorENSReleaseName ||
|
|
pProcessor.Name() == pathprocessor.ProcessorENSPublicKeyName ||
|
|
pProcessor.Name() == pathprocessor.ProcessorStickersBuyName {
|
|
continue
|
|
}
|
|
|
|
if !sendType.canUseProcessor(pProcessor) {
|
|
continue
|
|
}
|
|
|
|
for _, dest := range networks {
|
|
if dest.IsTest != testnetMode {
|
|
continue
|
|
}
|
|
|
|
if !sendType.isAvailableFor(network) {
|
|
continue
|
|
}
|
|
|
|
if !sendType.isAvailableBetween(network, dest) {
|
|
continue
|
|
}
|
|
|
|
if len(preferedChainIDs) > 0 && !containsNetworkChainID(dest, preferedChainIDs) {
|
|
continue
|
|
}
|
|
if containsNetworkChainID(dest, disabledToChainIDs) {
|
|
continue
|
|
}
|
|
|
|
processorInputParams := pathprocessor.ProcessorInputParams{
|
|
FromChain: network,
|
|
ToChain: dest,
|
|
FromToken: token,
|
|
ToToken: toToken,
|
|
ToAddr: addrTo,
|
|
FromAddr: addrFrom,
|
|
AmountIn: amountIn,
|
|
}
|
|
|
|
can, err := pProcessor.AvailableFor(processorInputParams)
|
|
if err != nil || !can {
|
|
continue
|
|
}
|
|
if maxAmountIn.ToInt().Cmp(pathprocessor.ZeroBigIntValue) == 0 {
|
|
continue
|
|
}
|
|
|
|
bonderFees, tokenFees, err := pProcessor.CalculateFees(processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
if bonderFees.Cmp(pathprocessor.ZeroBigIntValue) != 0 {
|
|
if maxAmountIn.ToInt().Cmp(amountIn) >= 0 {
|
|
if bonderFees.Cmp(amountIn) >= 0 {
|
|
continue
|
|
}
|
|
} else {
|
|
if bonderFees.Cmp(maxAmountIn.ToInt()) >= 0 {
|
|
continue
|
|
}
|
|
}
|
|
}
|
|
gasLimit := uint64(0)
|
|
if sendType.isTransfer(false) {
|
|
gasLimit, err = pProcessor.EstimateGas(processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
} else {
|
|
gasLimit = sendType.EstimateGas(r.ensService, r.stickersService, network, addrFrom, tokenID)
|
|
}
|
|
|
|
approvalContractAddress, err := pProcessor.GetContractAddress(processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
approvalRequired, approvalAmountRequired, approvalGasLimit, l1ApprovalFee, err := r.requireApproval(ctx, sendType, &approvalContractAddress, processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
var l1GasFeeWei uint64
|
|
if sendType.needL1Fee() {
|
|
txInputData, err := pProcessor.PackTxInputData(processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
l1GasFeeWei, _ = r.feesManager.GetL1Fee(ctx, network.ChainID, txInputData)
|
|
l1GasFeeWei += l1ApprovalFee
|
|
}
|
|
|
|
gasFees.L1GasFee = weiToGwei(big.NewInt(int64(l1GasFeeWei)))
|
|
|
|
requiredNativeBalance := new(big.Int).Mul(gweiToWei(maxFees), big.NewInt(int64(gasLimit)))
|
|
requiredNativeBalance.Add(requiredNativeBalance, new(big.Int).Mul(gweiToWei(maxFees), big.NewInt(int64(approvalGasLimit))))
|
|
requiredNativeBalance.Add(requiredNativeBalance, big.NewInt(int64(l1GasFeeWei))) // add l1Fee to requiredNativeBalance, in case of L1 chain l1Fee is 0
|
|
|
|
if nativeBalance.Cmp(requiredNativeBalance) <= 0 {
|
|
continue
|
|
}
|
|
|
|
// Removed the required fees from maxAMount in case of native token tx
|
|
if token.IsNative() {
|
|
maxAmountIn = (*hexutil.Big)(new(big.Int).Sub(maxAmountIn.ToInt(), requiredNativeBalance))
|
|
}
|
|
|
|
ethPrice := big.NewFloat(prices["ETH"])
|
|
|
|
approvalGasFees := new(big.Float).Mul(gweiToEth(maxFees), big.NewFloat((float64(approvalGasLimit))))
|
|
|
|
approvalGasCost := new(big.Float)
|
|
approvalGasCost.Mul(approvalGasFees, ethPrice)
|
|
|
|
l1GasCost := new(big.Float)
|
|
l1GasCost.Mul(gasFees.L1GasFee, ethPrice)
|
|
|
|
gasCost := new(big.Float)
|
|
gasCost.Mul(new(big.Float).Mul(gweiToEth(maxFees), big.NewFloat(float64(gasLimit))), ethPrice)
|
|
|
|
tokenFeesAsFloat := new(big.Float).Quo(
|
|
new(big.Float).SetInt(tokenFees),
|
|
big.NewFloat(math.Pow(10, float64(token.Decimals))),
|
|
)
|
|
tokenCost := new(big.Float)
|
|
tokenCost.Mul(tokenFeesAsFloat, big.NewFloat(prices[tokenID]))
|
|
|
|
cost := new(big.Float)
|
|
cost.Add(tokenCost, gasCost)
|
|
cost.Add(cost, approvalGasCost)
|
|
cost.Add(cost, l1GasCost)
|
|
mu.Lock()
|
|
candidates = append(candidates, &Path{
|
|
BridgeName: pProcessor.Name(),
|
|
From: network,
|
|
To: dest,
|
|
MaxAmountIn: maxAmountIn,
|
|
AmountIn: (*hexutil.Big)(pathprocessor.ZeroBigIntValue),
|
|
AmountOut: (*hexutil.Big)(pathprocessor.ZeroBigIntValue),
|
|
GasAmount: gasLimit,
|
|
GasFees: gasFees,
|
|
BonderFees: (*hexutil.Big)(bonderFees),
|
|
TokenFees: tokenFeesAsFloat,
|
|
Cost: cost,
|
|
EstimatedTime: estimatedTime,
|
|
ApprovalRequired: approvalRequired,
|
|
ApprovalGasFees: approvalGasFees,
|
|
ApprovalAmountRequired: (*hexutil.Big)(approvalAmountRequired),
|
|
ApprovalContractAddress: &approvalContractAddress,
|
|
})
|
|
mu.Unlock()
|
|
}
|
|
}
|
|
return nil
|
|
})
|
|
}
|
|
|
|
group.Wait()
|
|
|
|
suggestedRoutes := newSuggestedRoutes(amountIn, candidates, fromLockedAmount)
|
|
suggestedRoutes.TokenPrice = prices[tokenID]
|
|
suggestedRoutes.NativeChainTokenPrice = prices["ETH"]
|
|
for _, path := range suggestedRoutes.Best {
|
|
processorInputParams := pathprocessor.ProcessorInputParams{
|
|
FromChain: path.From,
|
|
ToChain: path.To,
|
|
AmountIn: path.AmountIn.ToInt(),
|
|
FromToken: &token.Token{
|
|
Symbol: tokenID,
|
|
},
|
|
}
|
|
|
|
amountOut, err := r.pathProcessors[path.BridgeName].CalculateAmountOut(processorInputParams)
|
|
if err != nil {
|
|
continue
|
|
}
|
|
path.AmountOut = (*hexutil.Big)(amountOut)
|
|
}
|
|
|
|
return suggestedRoutes, nil
|
|
}
|