/
root.go
138 lines (113 loc) · 3.73 KB
/
root.go
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// Copyright © 2018 Alex Kolbasov
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package cmd
import (
"fmt"
"os"
"github.com/mitchellh/go-homedir"
"github.com/spf13/cobra"
"github.com/spf13/viper"
)
const (
defaultThriftPort = "9083"
hostOpt = "host"
portOpt = "port"
ownerOpt = "owner"
outputOpt = "output"
hadoopUserEnv = "HADOOP_USER_NAME"
)
var cfgFile string
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "hmstool",
Short: "Hive metastore hmsclient tool",
Run: listTables,
Long: `Command line hive metastore hmsclient tool
The tool works with HMS over its thrift API. The metastore host can be specified
using either -H command-line argument or HMS_HOST environment variable.
Examples:
All examples assume that HMS_HOST point to correct metastore. For example:
export HMS_HOST=mymetastore.mycompany.com
1. List all tables
$ hmstool
default.tbl1
default.mydb
customers.data
2. List all databases
$ hmstool db list
default
mydb
3. List all tables in a database default
$ hmstool table list -d default
default.tbl1
default.mydb
`,
}
// 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() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
func getOwner() string {
owner := viper.GetString(ownerOpt)
if owner == "" {
owner = os.Getenv(hadoopUserEnv)
}
return owner
}
func init() {
cobra.OnInitialize(initConfig)
hadoopUser := os.Getenv(hadoopUserEnv)
if hadoopUser == "" {
hadoopUser = "hive"
}
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.hmstool.yaml)")
rootCmd.PersistentFlags().StringP(hostOpt, "H", "localhost", "hostname for HMS server")
rootCmd.PersistentFlags().StringP(portOpt, "p", defaultThriftPort, "port for HMS server")
rootCmd.PersistentFlags().StringP(ownerOpt, "U", hadoopUser, "owner name")
rootCmd.PersistentFlags().StringP(outputOpt, "o", "", "output file")
// Bind flags to viper variables
viper.BindPFlags(rootCmd.PersistentFlags())
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".hmstool" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".hmstool")
}
viper.SetConfigName(".hmstool") // name of config file (without extension)
viper.AddConfigPath("$HOME") // adding home directory as first search path
viper.SetEnvPrefix("hms") // All environment vars should start with SENTRY_
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}