command edits; external pkg for finding min deployment block; gofmt

libraries/shared/constants/external.go

@@ -0,0 +1,90 @@
+// VulcanizeDB
+// Copyright © 2019 Vulcanize
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package constants
+
+import (
+	"fmt"
+	"math"
+
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+var initialized = false
+
+func initConfig() {
+	if initialized {
+		return
+	}
+
+	if err := viper.ReadInConfig(); err == nil {
+		log.Info("Using config file:", viper.ConfigFileUsed())
+	} else {
+		panic(fmt.Sprintf("Could not find environment file: %v", err))
+	}
+	initialized = true
+}
+
+// GetMinDeploymentBlock gets the minimum deployment block for multiple contracts from config
+func GetMinDeploymentBlock() uint64 {
+	initConfig()
+	contractNames := getContractNames()
+	if len(contractNames) < 1 {
+		log.Fatalf("No contracts supplied")
+	}
+	minBlock := uint64(math.MaxUint64)
+	for _, c := range contractNames {
+		deployed := getDeploymentBlock(c)
+		if deployed < minBlock {
+			minBlock = deployed
+		}
+	}
+	return minBlock
+}
+
+func getContractNames() []string {
+	initConfig()
+	transformerNames := viper.GetStringSlice("exporter.transformerNames")
+	contractNames := make([]string, 0)
+	for _, transformerName := range transformerNames {
+		configKey := "exporter." + transformerName + ".contracts"
+		names := viper.GetStringSlice(configKey)
+		for _, name := range names {
+			contractNames = appendNoDuplicates(transformerNames, name)
+		}
+	}
+	return contractNames
+}
+
+func appendNoDuplicates(strSlice []string, str string) []string {
+	for _, strInSlice := range strSlice {
+		if strInSlice == str {
+			return strSlice
+		}
+	}
+	return append(strSlice, str)
+}
+
+func getDeploymentBlock(contractName string) uint64 {
+	configKey := "contract." + contractName + ".deployed"
+	value := viper.GetInt64(configKey)
+	if value < 0 {
+		log.Infof("No deployment block configured for contract \"%v\", defaulting to 0.", contractName)
+		return 0
+	}
+	return uint64(value)
+}