leveldb-ethdb-rpc/cmd/root.go

// VulcanizeDB
// Copyright © 2022 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 cmd

import (
	"fmt"
	"os"

	leveldb_ethdb_rpc "github.com/vulcanize/leveldb-ethdb-rpc/pkg"

	log "github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var cfgFile string

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:              "leveldb-ethdb-rpc",
	PersistentPreRun: initFuncs,
}

// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
	log.Info("----- Starting IPFS blockchain watcher -----")
	if err := rootCmd.Execute(); err != nil {
		log.Fatal(err)
	}
}

func initFuncs(cmd *cobra.Command, args []string) {
	viper.BindEnv(leveldb_ethdb_rpc.TOML_LOGRUS_FILE, leveldb_ethdb_rpc.LOGRUS_FILE)
	logfile := viper.GetString(leveldb_ethdb_rpc.TOML_LOGRUS_FILE)
	if logfile != "" {
		file, err := os.OpenFile(logfile,
			os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0666)
		if err == nil {
			log.Infof("Directing output to %s", logfile)
			log.SetOutput(file)
		} else {
			log.SetOutput(os.Stdout)
			log.Info("Failed to log to file, using default stdout")
		}
	} else {
		log.SetOutput(os.Stdout)
	}
	if err := logLevel(); err != nil {
		log.Fatal("Could not set log level: ", err)
	}
}

func logLevel() error {
	viper.BindEnv(leveldb_ethdb_rpc.TOML_LOGRUS_LEVEL, leveldb_ethdb_rpc.LOGRUS_LEVEL)
	lvl, err := log.ParseLevel(viper.GetString(leveldb_ethdb_rpc.TOML_LOGRUS_LEVEL))
	if err != nil {
		return err
	}
	log.SetLevel(lvl)
	if lvl > log.InfoLevel {
		log.SetReportCaller(true)
	}
	log.Info("Log level set to ", lvl.String())
	return nil
}

func init() {
	cobra.OnInitialize(initConfig)
	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file location")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if cfgFile != "" {
		viper.SetConfigFile(cfgFile)
		if err := viper.ReadInConfig(); err == nil {
			log.Printf("Using config file: %s", viper.ConfigFileUsed())
		} else {
			log.Fatal(fmt.Sprintf("Couldn't read config file: %s", err.Error()))
		}
	} else {
		log.Warn("No config file passed with --config flag")
	}
}