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         _ "net/http/pprof"
  14         "os"
  15
  16         "git.arvados.org/arvados.git/lib/cmd"
  17         "git.arvados.org/arvados.git/lib/config"
  18         "git.arvados.org/arvados.git/lib/service"
  19         "git.arvados.org/arvados.git/sdk/go/arvados"
  20         "git.arvados.org/arvados.git/sdk/go/ctxlog"
  21         "git.arvados.org/arvados.git/sdk/go/health"
  22         "github.com/jmoiron/sqlx"
  23         _ "github.com/lib/pq"
  24         "github.com/prometheus/client_golang/prometheus"
  25         "github.com/sirupsen/logrus"
  26 )
  27
  28 func main() {
  29         os.Exit(runCommand(os.Args[0], os.Args[1:], os.Stdin, os.Stdout, os.Stderr))
  30 }
  31
  32 func runCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
  33         logger := ctxlog.FromContext(context.Background())
  34
  35         var options RunOptions
  36         flags := flag.NewFlagSet(prog, flag.ContinueOnError)
  37         flags.BoolVar(&options.Once, "once", false,
  38                 "balance once and then exit")
  39         flags.BoolVar(&options.CommitPulls, "commit-pulls", false,
  40                 "send pull requests (make more replicas of blocks that are underreplicated or are not in optimal rendezvous probe order)")
  41         flags.BoolVar(&options.CommitTrash, "commit-trash", false,
  42                 "send trash requests (delete unreferenced old blocks, and excess replicas of overreplicated blocks)")
  43         flags.BoolVar(&options.CommitConfirmedFields, "commit-confirmed-fields", true,
  44                 "update collection fields (replicas_confirmed, storage_classes_confirmed, etc.)")
  45         dumpFlag := flags.Bool("dump", false, "dump details for each block to stdout")
  46         pprofAddr := flags.String("pprof", "", "serve Go profile data at `[addr]:port`")
  47         // "show version" is implemented by service.Command, so we
  48         // don't need the var here -- we just need the -version flag
  49         // to pass flags.Parse().
  50         flags.Bool("version", false, "Write version information to stdout and exit 0")
  51
  52         if *pprofAddr != "" {
  53                 go func() {
  54                         logrus.Println(http.ListenAndServe(*pprofAddr, nil))
  55                 }()
  56         }
  57
  58         loader := config.NewLoader(os.Stdin, logger)
  59         loader.SetupFlags(flags)
  60
  61         munged := loader.MungeLegacyConfigArgs(logger, args, "-legacy-keepbalance-config")
  62         if ok, code := cmd.ParseFlags(flags, prog, munged, "", stderr); !ok {
  63                 return code
  64         }
  65
  66         if *dumpFlag {
  67                 dumper := logrus.New()
  68                 dumper.Out = os.Stdout
  69                 dumper.Formatter = &logrus.TextFormatter{}
  70                 options.Dumper = dumper
  71         }
  72
  73         // Drop our custom args that would be rejected by the generic
  74         // service.Command
  75         args = nil
  76         dropFlag := map[string]bool{
  77                 "once":                    true,
  78                 "commit-pulls":            true,
  79                 "commit-trash":            true,
  80                 "commit-confirmed-fields": true,
  81                 "dump":                    true,
  82         }
  83         flags.Visit(func(f *flag.Flag) {
  84                 if !dropFlag[f.Name] {
  85                         args = append(args, "-"+f.Name+"="+f.Value.String())
  86                 }
  87         })
  88
  89         return service.Command(arvados.ServiceNameKeepbalance,
  90                 func(ctx context.Context, cluster *arvados.Cluster, token string, registry *prometheus.Registry) service.Handler {
  91                         if !options.Once && cluster.Collections.BalancePeriod == arvados.Duration(0) {
  92                                 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)"))
  93                         }
  94
  95                         ac, err := arvados.NewClientFromConfig(cluster)
  96                         ac.AuthToken = token
  97                         if err != nil {
  98                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("error initializing client from cluster config: %s", err))
  99                         }
 100
 101                         db, err := sqlx.Open("postgres", cluster.PostgreSQL.Connection.String())
 102                         if err != nil {
 103                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("postgresql connection failed: %s", err))
 104                         }
 105                         if p := cluster.PostgreSQL.ConnectionPool; p > 0 {
 106                                 db.SetMaxOpenConns(p)
 107                         }
 108                         err = db.Ping()
 109                         if err != nil {
 110                                 return service.ErrorHandler(ctx, cluster, fmt.Errorf("postgresql connection succeeded but ping failed: %s", err))
 111                         }
 112
 113                         if options.Logger == nil {
 114                                 options.Logger = ctxlog.FromContext(ctx)
 115                         }
 116
 117                         srv := &Server{
 118                                 Cluster:    cluster,
 119                                 ArvClient:  ac,
 120                                 RunOptions: options,
 121                                 Metrics:    newMetrics(registry),
 122                                 Logger:     options.Logger,
 123                                 Dumper:     options.Dumper,
 124                                 DB:         db,
 125                         }
 126                         srv.Handler = &health.Handler{
 127                                 Token:  cluster.ManagementToken,
 128                                 Prefix: "/_health/",
 129                                 Routes: health.Routes{"ping": srv.CheckHealth},
 130                         }
 131
 132                         go srv.run()
 133                         return srv
 134                 }).RunCommand(prog, args, stdin, stdout, stderr)
 135 }