services/keep-balance/main.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: AGPL-3.0
   4
   5 package main
   6
   7 import (
   8         "context"
   9         "flag"
  10         "fmt"
  11         "io"
  12         "net/http"
  13         "os"
  14
  15         "git.arvados.org/arvados.git/lib/config"
  16         "git.arvados.org/arvados.git/lib/service"
  17         "git.arvados.org/arvados.git/sdk/go/arvados"
  18         "git.arvados.org/arvados.git/sdk/go/ctxlog"
  19         "github.com/prometheus/client_golang/prometheus"
  20         "github.com/sirupsen/logrus"
  21 )
  22
  23 func main() {
  24         os.Exit(runCommand(os.Args[0], os.Args[1:], os.Stdin, os.Stdout, os.Stderr))
  25 }
  26
  27 func runCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
  28         logger := ctxlog.FromContext(context.Background())
  29
  30         var options RunOptions
  31         flags := flag.NewFlagSet(prog, flag.ExitOnError)
  32         flags.BoolVar(&options.Once, "once", false,
  33                 "balance once and then exit")
  34         flags.BoolVar(&options.CommitPulls, "commit-pulls", false,
  35                 "send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)")
  36         flags.BoolVar(&options.CommitTrash, "commit-trash", false,
  37                 "send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)")
  38         flags.Bool("version", false, "Write version information to stdout and exit 0")
  39         dumpFlag := flags.Bool("dump", false, "dump details for each block to stdout")
  40
  41         loader := config.NewLoader(os.Stdin, logger)
  42         loader.SetupFlags(flags)
  43
  44         munged := loader.MungeLegacyConfigArgs(logger, args, "-legacy-keepbalance-config")
  45         flags.Parse(munged)
  46
  47         if *dumpFlag {
  48                 dumper := logrus.New()
  49                 dumper.Out = os.Stdout
  50                 dumper.Formatter = &logrus.TextFormatter{}
  51                 options.Dumper = dumper
  52         }
  53
  54         // Drop our custom args that would be rejected by the generic
  55         // service.Command
  56         args = nil
  57         dropFlag := map[string]bool{
  58                 "once":         true,
  59                 "commit-pulls": true,
  60                 "commit-trash": true,
  61                 "dump":         true,
  62         }
  63         flags.Visit(func(f *flag.Flag) {
  64                 if !dropFlag[f.Name] {
  65                         args = append(args, "-"+f.Name, f.Value.String())
  66                 }
  67         })
  68
  69         return service.Command(arvados.ServiceNameKeepbalance,
  70                 func(ctx context.Context, cluster *arvados.Cluster, token string, registry *prometheus.Registry) service.Handler {
  71                         if !options.Once && cluster.Collections.BalancePeriod == arvados.Duration(0) {
  72                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("cannot start service: Collections.BalancePeriod is zero (if you want to run once and then exit, use the -once flag)"))
  73                         }
  74
  75                         ac, err := arvados.NewClientFromConfig(cluster)
  76                         ac.AuthToken = token
  77                         if err != nil {
  78                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("error initializing client from cluster config: %s", err))
  79                         }
  80
  81                         if options.Logger == nil {
  82                                 options.Logger = ctxlog.FromContext(ctx)
  83                         }
  84
  85                         srv := &Server{
  86                                 Handler:    http.NotFoundHandler(),
  87                                 Cluster:    cluster,
  88                                 ArvClient:  ac,
  89                                 RunOptions: options,
  90                                 Metrics:    newMetrics(registry),
  91                                 Logger:     options.Logger,
  92                                 Dumper:     options.Dumper,
  93                         }
  94
  95                         go srv.run()
  96                         return srv
  97                 }).RunCommand(prog, args, stdin, stdout, stderr)
  98 }