allow setting custom URL for CCXT-rest server

cmd/trade.go

@@ -23,6 +23,7 @@ import (
 	"github.com/stellar/kelp/support/monitoring"
 	"github.com/stellar/kelp/support/networking"
 	"github.com/stellar/kelp/support/prefs"
+	"github.com/stellar/kelp/support/sdk"
 	"github.com/stellar/kelp/support/utils"
 	"github.com/stellar/kelp/trader"
 )
@@ -423,6 +424,14 @@ func runTradeCmd(options inputs) {
 		}
 	}
 
+	if botConfig.CcxtRestURL != nil {
+		e := sdk.SetBaseURL(*botConfig.CcxtRestURL)
+		if e != nil {
+			logger.Fatal(l, fmt.Errorf("unable to set CCXT-rest URL to '%s': %s", *botConfig.CcxtRestURL, e))
+		}
+	}
+	l.Infof("using CCXT-rest URL: %s\n", sdk.GetBaseURL())
+
 	ieif := plugins.MakeIEIF(botConfig.IsTradingSdex())
 	network := utils.ParseNetwork(botConfig.HorizonURL)
 	exchangeShim, sdex := makeExchangeShimSdex(

examples/configs/trader/sample_trader.cfg

@@ -48,6 +48,9 @@ FILL_TRACKER_DELETE_CYCLES_THRESHOLD=0
 # the url for your horizon instance. If this url contains the string "test" then the bot assumes it is using the test network.
 HORIZON_URL="https://horizon-testnet.stellar.org"
 
+# the URL to use for your CCXT-rest instance. Defaults to http://localhost:3000 if unset
+#CCXT_REST_URL="http://localhost:3000"
+
 # specify parameters for how we compute the operation fee from the /fee_stats endpoint
 [FEE]
 # trigger when "ledger_capacity_usage" in /fee_stats is >= this value

support/sdk/ccxt.go

@@ -16,7 +16,21 @@ import (
 )
 
 // ccxtBaseURL should not have suffix of '/'
-const ccxtBaseURL = "http://localhost:3000"
+var ccxtBaseURL = "http://localhost:3000"
+
+// SetBaseURL allows setting the base URL for ccxt
+func SetBaseURL(baseURL string) error {
+	if strings.HasSuffix(baseURL, "/") {
+		return fmt.Errorf("invalid format for baseURL, should not end with trailing '/': %s", baseURL)
+	}
+	ccxtBaseURL = baseURL
+	return nil
+}
+
+// GetBaseURL returns the base URL for ccxt
+func GetBaseURL() string {
+	return ccxtBaseURL
+}
 
 // Ccxt Rest SDK (https://github.com/franz-see/ccxt-rest, https://github.com/ccxt/ccxt/)
 type Ccxt struct {

trader/config.go

@@ -32,6 +32,7 @@ type BotConfig struct {
 	FillTrackerSleepMillis             uint32     `valid:"-" toml:"FILL_TRACKER_SLEEP_MILLIS"`
 	FillTrackerDeleteCyclesThreshold   int64      `valid:"-" toml:"FILL_TRACKER_DELETE_CYCLES_THRESHOLD"`
 	HorizonURL                         string     `valid:"-" toml:"HORIZON_URL"`
+	CcxtRestURL                        *string    `valid:"-" toml:"CCXT_REST_URL"`
 	Fee                                *FeeConfig `valid:"-" toml:"FEE"`
 	CentralizedPricePrecisionOverride  *int8      `valid:"-" toml:"CENTRALIZED_PRICE_PRECISION_OVERRIDE"`
 	CentralizedVolumePrecisionOverride *int8      `valid:"-" toml:"CENTRALIZED_VOLUME_PRECISION_OVERRIDE"`