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         "git.arvados.org/arvados.git/sdk/go/health"
  19         "github.com/jmoiron/sqlx"
  20         "github.com/prometheus/client_golang/prometheus"
  21         "github.com/sirupsen/logrus"
  22 )
  23
  24 func main() {
  25         os.Exit(runCommand(os.Args[0], os.Args[1:], os.Stdin, os.Stdout, os.Stderr))
  26 }
  27
  28 func runCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
  29         logger := ctxlog.FromContext(context.Background())
  30
  31         var options RunOptions
  32         flags := flag.NewFlagSet(prog, flag.ExitOnError)
  33         flags.BoolVar(&options.Once, "once", false,
  34                 "balance once and then exit")
  35         flags.BoolVar(&options.CommitPulls, "commit-pulls", false,
  36                 "send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)")
  37         flags.BoolVar(&options.CommitTrash, "commit-trash", false,
  38                 "send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)")
  39         flags.BoolVar(&options.CommitConfirmedFields, "commit-confirmed-fields", true,
  40                 "update collection fields (replicas_confirmed, storage_classes_confirmed, etc.)")
  41         flags.Bool("version", false, "Write version information to stdout and exit 0")
  42         dumpFlag := flags.Bool("dump", false, "dump details for each block to stdout")
  43
  44         loader := config.NewLoader(os.Stdin, logger)
  45         loader.SetupFlags(flags)
  46
  47         munged := loader.MungeLegacyConfigArgs(logger, args, "-legacy-keepbalance-config")
  48         flags.Parse(munged)
  49
  50         if *dumpFlag {
  51                 dumper := logrus.New()
  52                 dumper.Out = os.Stdout
  53                 dumper.Formatter = &logrus.TextFormatter{}
  54                 options.Dumper = dumper
  55         }
  56
  57         // Drop our custom args that would be rejected by the generic
  58         // service.Command
  59         args = nil
  60         dropFlag := map[string]bool{
  61                 "once":                    true,
  62                 "commit-pulls":            true,
  63                 "commit-trash":            true,
  64                 "commit-confirmed-fields": true,
  65                 "dump":                    true,
  66         }
  67         flags.Visit(func(f *flag.Flag) {
  68                 if !dropFlag[f.Name] {
  69                         args = append(args, "-"+f.Name, f.Value.String())
  70                 }
  71         })
  72
  73         return service.Command(arvados.ServiceNameKeepbalance,
  74                 func(ctx context.Context, cluster *arvados.Cluster, token string, registry *prometheus.Registry) service.Handler {
  75                         if !options.Once && cluster.Collections.BalancePeriod == arvados.Duration(0) {
  76                                 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)"))
  77                         }
  78
  79                         ac, err := arvados.NewClientFromConfig(cluster)
  80                         ac.AuthToken = token
  81                         if err != nil {
  82                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("error initializing client from cluster config: %s", err))
  83                         }
  84
  85                         db, err := sqlx.Open("postgres", cluster.PostgreSQL.Connection.String())
  86                         if err != nil {
  87                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("postgresql connection failed: %s", err))
  88                         }
  89                         if p := cluster.PostgreSQL.ConnectionPool; p > 0 {
  90                                 db.SetMaxOpenConns(p)
  91                         }
  92                         err = db.Ping()
  93                         if err != nil {
  94                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("postgresql connection succeeded but ping failed: %s", err))
  95                         }
  96
  97                         if options.Logger == nil {
  98                                 options.Logger = ctxlog.FromContext(ctx)
  99                         }
 100
 101                         srv := &Server{
 102                                 Cluster:    cluster,
 103                                 ArvClient:  ac,
 104                                 RunOptions: options,
 105                                 Metrics:    newMetrics(registry),
 106                                 Logger:     options.Logger,
 107                                 Dumper:     options.Dumper,
 108                                 DB:         db,
 109                         }
 110                         srv.Handler = &health.Handler{
 111                                 Token:  cluster.ManagementToken,
 112                                 Prefix: "/_health/",
 113                                 Routes: health.Routes{"ping": srv.CheckHealth},
 114                         }
 115
 116                         go srv.run()
 117                         return srv
 118                 }).RunCommand(prog, args, stdin, stdout, stderr)
 119 }