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/
filter.go
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/
filter.go
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package subscriptions
import (
"encoding/hex"
"github.com/notegio/openrelay/db"
"github.com/notegio/openrelay/types"
"github.com/notegio/openrelay/common"
"github.com/ethereum/go-ethereum/crypto/sha3"
"net/url"
"bytes"
"strings"
"strconv"
)
type OrderFilter struct {
NetworkID int64 `json:"networkId"`
MakerAssetProxyID string `json:"makerAssetProxyId"`
TakerAssetProxyID string `json:"takerAssetProxyId"`
MakerAssetAddress string `json:"makerAssetAddress"`
TakerAssetAddress string `json:"takerAssetAddress"`
AssetAddress string `json:"assetAddress"`
ExchangeAddress string `json:"exchangeContractAddress"`
SenderAddress string `json:"senderAddress"`
MakerAddress string `json:"makerAddress"`
TakerAddress string `json:"takerAddress"`
TraderAddress string `json:"traderAddress"`
FeeRecipientAddress string `json:"feeRecipient"`
MakerAssetData string `json:"makerAssetData"`
TakerAssetData string `json:"takerAssetData"`
TraderAssetData string `json:"traderAssetData"`
PoolID string `json:"_poolId"`
PoolName string `json:"_poolName"`
TakerFee string `json:"_takerFee"`
}
type ExchangeLookup interface {
GetExchangesByNetwork(network int64) ([]*types.Address, error)
}
// GetFilter returns a function that can be quickly used to evaluate whether a
// given order matches the criteria of this filter. This is sort of a
// just-in-time compiler, in that it produces an efficient fuction for testing
// an order. While this function is fairly complicated, the function it returns
// will test only the attributes that the filter is interested in, and does not
// re-evaluate filter parameters when checking each order.
func (ofilter *OrderFilter) GetFilter(lookup ExchangeLookup) (func(*db.Order) (bool), error) {
predicates := []func(*db.Order)(bool){}
// TODO: Once we have some data on the combinations of attributes people
// filter on, we can potentially order these to maximize filtering efficiency.
if ofilter.MakerAssetProxyID != "" {
data := [4]byte{}
raw, err := hex.DecodeString(strings.TrimPrefix(ofilter.MakerAssetProxyID, "0x"))
if err != nil { return nil, err }
copy(data[:], raw[:])
predicates = append(predicates, func(order *db.Order) (bool) { return order.MakerAssetData.IsType(data) } )
}
if ofilter.TakerAssetProxyID != "" {
data := [4]byte{}
raw, err := hex.DecodeString(strings.TrimPrefix(ofilter.TakerAssetProxyID, "0x"))
if err != nil { return nil, err }
copy(data[:], raw[:])
predicates = append(predicates, func(order *db.Order) (bool) { return order.TakerAssetData.IsType(data) } )
}
if ofilter.MakerAssetAddress != "" {
address, err := common.HexToAddress(ofilter.MakerAssetAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.MakerAssetAddress[:], address[:]) } )
}
if ofilter.TakerAssetAddress != "" {
address, err := common.HexToAddress(ofilter.TakerAssetAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.TakerAssetAddress[:], address[:]) } )
}
if ofilter.AssetAddress != "" {
address, err := common.HexToAddress(ofilter.AssetAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.TakerAssetAddress[:], address[:]) || bytes.Equal(order.MakerAssetAddress[:], address[:]) } )
}
if ofilter.ExchangeAddress != "" {
address, err := common.HexToAddress(ofilter.ExchangeAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.ExchangeAddress[:], address[:]) } )
}
if ofilter.FeeRecipientAddress != "" {
address, err := common.HexToAddress(ofilter.FeeRecipientAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.FeeRecipient[:], address[:]) } )
}
if ofilter.SenderAddress != "" {
address, err := common.HexToAddress(ofilter.SenderAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.SenderAddress[:], address[:]) } )
}
if ofilter.MakerAddress != "" {
address, err := common.HexToAddress(ofilter.MakerAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.Maker[:], address[:]) } )
}
if ofilter.TakerAddress != "" {
address, err := common.HexToAddress(ofilter.TakerAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.Taker[:], address[:]) } )
}
if ofilter.TraderAddress != "" {
address, err := common.HexToAddress(ofilter.TraderAddress)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.Maker[:], address[:]) || bytes.Equal(order.Taker[:], address[:]) } )
}
if ofilter.MakerAssetData != "" {
assetData, err := common.HexToAssetData(ofilter.MakerAssetData)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.MakerAssetData, assetData) } )
}
if ofilter.TakerAssetData != "" {
assetData, err := common.HexToAssetData(ofilter.TakerAssetData)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.TakerAssetData, assetData) } )
}
if ofilter.TraderAssetData != "" {
assetData, err := common.HexToAssetData(ofilter.TraderAssetData)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.TakerAssetData, assetData) || bytes.Equal(order.MakerAssetData, assetData) } )
}
if ofilter.PoolID != "" {
poolID, err := hex.DecodeString(strings.TrimPrefix(ofilter.PoolID, "0x"))
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.PoolID, poolID) } )
}
if ofilter.PoolName != "" {
dataSha := sha3.NewKeccak256()
dataSha.Write([]byte(ofilter.PoolName))
poolID := dataSha.Sum(nil)
predicates = append(predicates, func(order *db.Order) (bool) { return bytes.Equal(order.PoolID, poolID) } )
}
if ofilter.NetworkID != 0 {
exchangeAddresses, err := lookup.GetExchangesByNetwork(ofilter.NetworkID)
if err != nil { return nil, err }
predicates = append(predicates, func(order *db.Order) (bool) {
for _, address := range exchangeAddresses {
if bytes.Equal(order.ExchangeAddress[:], address[:]) {
return true
}
}
return false
})
}
return func(order *db.Order) (bool) {
for _, predicate := range predicates {
if !predicate(order) {
return false
}
}
return true
}, nil
}
func FilterFromQueryString(queryString string) (*OrderFilter, error) {
query, err := url.ParseQuery(queryString)
if err != nil { return nil, err}
ofilter := &OrderFilter{}
if query.Get("networkId") != "" {
networkID, err := strconv.Atoi(query.Get("networkId"))
if err != nil { return nil, err}
ofilter.NetworkID = int64(networkID)
} else {
ofilter.NetworkID = 0
}
ofilter.MakerAssetProxyID = query.Get("makerAssetProxyId")
ofilter.TakerAssetProxyID = query.Get("takerAssetProxyId")
ofilter.MakerAssetAddress = query.Get("makerAssetAddress")
ofilter.TakerAssetAddress = query.Get("takerAssetAddress")
ofilter.AssetAddress = query.Get("assetAddress")
ofilter.ExchangeAddress = query.Get("exchangeContractAddress")
ofilter.SenderAddress = query.Get("senderAddress")
ofilter.MakerAddress = query.Get("makerAddress")
ofilter.TakerAddress = query.Get("takerAddress")
ofilter.TraderAddress = query.Get("traderAddress")
ofilter.FeeRecipientAddress = query.Get("feeRecipient")
ofilter.MakerAssetData = query.Get("makerAssetData")
ofilter.TakerAssetData = query.Get("takerAssetData")
ofilter.TraderAssetData = query.Get("traderAssetData")
ofilter.PoolID = query.Get("_poolId")
ofilter.PoolName = query.Get("_poolName")
ofilter.TakerFee = query.Get("_takerFee")
return ofilter, nil
}