a command line interface for elastic (work in progress)
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package main
import (
"context"
"flag"
"fmt"
"os"
"io/ioutil"
"strings"
)
func handleIndexCommand() {
if len(os.Args) < 3 {
fmt.Fprintf(os.Stderr, "%s index: subcommand missing\n", os.Args[0])
printIndexUsage()
os.Exit(1)
}
subcmd := strings.ToLower(os.Args[2])
switch subcmd {
case "list":
listcmd := flag.NewFlagSet("index list", flag.ExitOnError)
listcmd.SetOutput(os.Stdout)
cfgpath := listcmd.String("config", "", "path to configuration")
listcmd.Parse(os.Args[3:])
cfg := LoadConfig(*cfgpath)
es := ClientFromConfig(cfg.Elastic)
indexes, err := es.IndexNames()
if err != nil {
fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
os.Exit(1)
}
for _, index := range indexes {
fmt.Printf("%s\n", index)
}
case "delete":
deletecmd := flag.NewFlagSet("index delete", flag.ExitOnError)
deletecmd.SetOutput(os.Stdout)
cfgpath := deletecmd.String("config", "", "path to configuration")
iname := deletecmd.String("name", "", "(required) index name to delete")
deletecmd.Parse(os.Args[3:])
if *iname == "" {
fmt.Fprintf(os.Stderr, "name parameter is required for index delete\n")
deletecmd.PrintDefaults()
os.Exit(1)
}
cfg := LoadConfig(*cfgpath)
es := ClientFromConfig(cfg.Elastic)
_, err := es.DeleteIndex(*iname).Do(context.Background())
if err != nil {
fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
os.Exit(1)
}
case "create":
createcmd := flag.NewFlagSet("index create", flag.ExitOnError)
createcmd.SetOutput(os.Stdout)
cfgpath := createcmd.String("config", "", "path to configuration")
iname := createcmd.String("name", "", "(required) index name to create")
bodystr := createcmd.String("body", "",
"json string to use as body options during create")
bodyfile := createcmd.String("bodyfile", "",
"json file to use as body options during create")
createcmd.Parse(os.Args[3:])
if *iname == "" {
fmt.Fprintf(os.Stderr, "name parameter is required for index create\n")
createcmd.PrintDefaults()
os.Exit(1)
}
if *bodystr != "" && *bodyfile != "" {
fmt.Fprintf(os.Stderr,
"body parameter cannot be used with bodyfile parameter\n")
os.Exit(1)
}
body := *bodystr
if *bodyfile != "" {
raw, err := ioutil.ReadFile(*bodyfile)
if err != nil {
fmt.Fprintf(os.Stderr, "read error: %s\n", err.Error())
os.Exit(1)
}
body = string(raw)
}
cfg := LoadConfig(*cfgpath)
es := ClientFromConfig(cfg.Elastic)
ics := es.CreateIndex(*iname)
if body != "" {
ics.Body(body)
}
_, err := ics.Do(context.Background())
if err != nil {
fmt.Fprintf(os.Stderr, "elastic error: %s\n", err.Error())
os.Exit(1)
}
case "--help":
printIndexUsage()
os.Exit(0)
default:
fmt.Fprintf(os.Stderr, "%s: index '%s' is not a recognized subcommand\n",
os.Args[0], os.Args[2])
printDefaultUsage()
os.Exit(1)
}
}
func printIndexUsage() {
fmt.Printf("Usage: %s index <subcommand> ... \n", os.Args[0])
fmt.Printf("See '%s index <subcommand> --help' for information", os.Args[0])
fmt.Printf(" on a specific command\n")
fmt.Printf("valid subcommands:\n")
fmt.Printf(" list list indexes\n")
fmt.Printf(" delete delete index\n")
fmt.Printf(" create create index\n")
}