feat: periodic version check and json config (#10438)

Co-authored-by: Lucas Molas <schomatis@gmail.com>
Co-authored-by: Marcin Rataj <lidel@lidel.org>

cmd/ipfs/kubo/daemon.go

@@ -1,9 +1,11 @@
 package kubo
 
 import (
+	"context"
 	"errors"
 	_ "expvar"
 	"fmt"
+	"math"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
@@ -438,9 +440,11 @@ func daemonFunc(req *cmds.Request, re cmds.ResponseEmitter, env cmds.Environment
 		return fmt.Errorf("unrecognized routing option: %s", routingOption)
 	}
 
-	agentVersionSuffixString, _ := req.Options[agentVersionSuffix].(string)
-	if agentVersionSuffixString != "" {
-		version.SetUserAgentSuffix(agentVersionSuffixString)
+	// Set optional agent version suffix
+	versionSuffixFromCli, _ := req.Options[agentVersionSuffix].(string)
+	versionSuffix := cfg.Version.AgentSuffix.WithDefault(versionSuffixFromCli)
+	if versionSuffix != "" {
+		version.SetUserAgentSuffix(versionSuffix)
 	}
 
 	node, err := core.NewNode(req.Context, ncfg)
@@ -610,6 +614,15 @@ take effect.
 			}
 			if len(peers) == 0 {
 				log.Error("failed to bootstrap (no peers found): consider updating Bootstrap or Peering section of your config")
+			} else {
+				// After 1 minute we should have enough peers
+				// to run informed version check
+				startVersionChecker(
+					cctx.Context(),
+					node,
+					cfg.Version.SwarmCheckEnabled.WithDefault(true),
+					cfg.Version.SwarmCheckPercentThreshold.WithDefault(config.DefaultSwarmCheckPercentThreshold),
+				)
 			}
 		})
 	}
@@ -1056,3 +1069,41 @@ func printVersion() {
 	fmt.Printf("System version: %s\n", runtime.GOARCH+"/"+runtime.GOOS)
 	fmt.Printf("Golang version: %s\n", runtime.Version())
 }
+
+func startVersionChecker(ctx context.Context, nd *core.IpfsNode, enabled bool, percentThreshold int64) {
+	if !enabled {
+		return
+	}
+	ticker := time.NewTicker(time.Hour)
+	defer ticker.Stop()
+	go func() {
+		for {
+			o, err := commands.DetectNewKuboVersion(nd, percentThreshold)
+			if err != nil {
+				// The version check is best-effort, and may fail in custom
+				// configurations that do not run standard WAN DHT. If it
+				// errors here, no point in spamming logs: og once and exit.
+				log.Errorw("initial version check failed, will not be run again", "error", err)
+				return
+			}
+			if o.UpdateAvailable {
+				newerPercent := fmt.Sprintf("%.0f%%", math.Round(float64(o.WithGreaterVersion)/float64(o.PeersSampled)*100))
+				log.Errorf(`
+⚠️ A NEW VERSION OF KUBO DETECTED
+
+This Kubo node is running an outdated version (%s).
+%s of the sampled Kubo peers are running a higher version.
+Visit https://github.com/ipfs/kubo/releases or https://dist.ipfs.tech/#kubo and update to version %s or later.`,
+					o.RunningVersion, newerPercent, o.GreatestVersion)
+			}
+			select {
+			case <-ctx.Done():
+				return
+			case <-nd.Process.Closing():
+				return
+			case <-ticker.C:
+				continue
+			}
+		}
+	}()
+}