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         "os"
  13
  14         "git.arvados.org/arvados.git/lib/config"
  15         "git.arvados.org/arvados.git/lib/service"
  16         "git.arvados.org/arvados.git/sdk/go/arvados"
  17         "git.arvados.org/arvados.git/sdk/go/ctxlog"
  18         "github.com/prometheus/client_golang/prometheus"
  19         "github.com/sirupsen/logrus"
  20 )
  21
  22 func main() {
  23         os.Exit(runCommand(os.Args[0], os.Args[1:], os.Stdin, os.Stdout, os.Stderr))
  24 }
  25
  26 func runCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
  27         logger := ctxlog.FromContext(context.Background())
  28
  29         var options RunOptions
  30         flags := flag.NewFlagSet(prog, flag.ExitOnError)
  31         flags.BoolVar(&options.Once, "once", false,
  32                 "balance once and then exit")
  33         flags.BoolVar(&options.CommitPulls, "commit-pulls", false,
  34                 "send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)")
  35         flags.BoolVar(&options.CommitTrash, "commit-trash", false,
  36                 "send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)")
  37         flags.Bool("version", false, "Write version information to stdout and exit 0")
  38         dumpFlag := flags.Bool("dump", false, "dump details for each block to stdout")
  39
  40         loader := config.NewLoader(os.Stdin, logger)
  41         loader.SetupFlags(flags)
  42
  43         munged := loader.MungeLegacyConfigArgs(logger, args, "-legacy-keepbalance-config")
  44         flags.Parse(munged)
  45
  46         if *dumpFlag {
  47                 dumper := logrus.New()
  48                 dumper.Out = os.Stdout
  49                 dumper.Formatter = &logrus.TextFormatter{}
  50                 options.Dumper = dumper
  51         }
  52
  53         // Only pass along the version flag, which gets handled in RunCommand
  54         args = nil
  55         flags.Visit(func(f *flag.Flag) {
  56                 if f.Name == "version" {
  57                         args = append(args, "-"+f.Name, f.Value.String())
  58                 }
  59         })
  60
  61         return service.Command(arvados.ServiceNameKeepbalance,
  62                 func(ctx context.Context, cluster *arvados.Cluster, token string, registry *prometheus.Registry) service.Handler {
  63                         if !options.Once && cluster.Collections.BalancePeriod == arvados.Duration(0) {
  64                                 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)"))
  65                         }
  66
  67                         ac, err := arvados.NewClientFromConfig(cluster)
  68                         ac.AuthToken = token
  69                         if err != nil {
  70                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("error initializing client from cluster config: %s", err))
  71                         }
  72
  73                         if options.Logger == nil {
  74                                 options.Logger = ctxlog.FromContext(ctx)
  75                         }
  76
  77                         srv := &Server{
  78                                 Cluster:    cluster,
  79                                 ArvClient:  ac,
  80                                 RunOptions: options,
  81                                 Metrics:    newMetrics(registry),
  82                                 Logger:     options.Logger,
  83                                 Dumper:     options.Dumper,
  84                         }
  85
  86                         go srv.run()
  87                         return srv
  88                 }).RunCommand(prog, args, stdin, stdout, stderr)
  89 }