Add monthly license update job (#16391)

cmd/license-update.go

@@ -0,0 +1,122 @@
+// Copyright (c) 2015-2023 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/minio/minio/internal/logger"
+	"github.com/tidwall/gjson"
+)
+
+const (
+	licUpdateCycle = 24 * time.Hour * 30
+	licRenewURL    = "https://subnet.min.io/api/cluster/renew-license"
+	licRenewURLDev = "http://localhost:9000/api/cluster/renew-license"
+)
+
+// initlicenseUpdateJob start the periodic license update job in the background.
+func initLicenseUpdateJob(ctx context.Context, objAPI ObjectLayer) {
+	go func() {
+		r := rand.New(rand.NewSource(time.Now().UnixNano()))
+		// Leader node (that successfully acquires the lock inside licenceUpdaterLoop)
+		// will keep performing the license update. If the leader goes down for some
+		// reason, the lock will be released and another node will acquire it and
+		// take over because of this loop.
+		for {
+			licenceUpdaterLoop(ctx, objAPI)
+
+			// license update stopped for some reason.
+			// sleep for some time and try again.
+			duration := time.Duration(r.Float64() * float64(time.Hour))
+			if duration < time.Second {
+				// Make sure to sleep atleast a second to avoid high CPU ticks.
+				duration = time.Second
+			}
+			time.Sleep(duration)
+		}
+	}()
+}
+
+func licenceUpdaterLoop(ctx context.Context, objAPI ObjectLayer) {
+	ctx, cancel := globalLeaderLock.GetLock(ctx)
+	defer cancel()
+
+	licenseUpdateTimer := time.NewTimer(licUpdateCycle)
+	defer licenseUpdateTimer.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-licenseUpdateTimer.C:
+
+			if globalSubnetConfig.Registered() {
+				performLicenseUpdate(ctx, objAPI)
+			}
+
+			// Reset the timer for next cycle.
+			licenseUpdateTimer.Reset(licUpdateCycle)
+		}
+	}
+}
+
+func performLicenseUpdate(ctx context.Context, objectAPI ObjectLayer) {
+	// the subnet license renewal api renews the license only
+	// if required e.g. when it is expiring soon
+	url := licRenewURL
+	if globalIsCICD {
+		url = licRenewURLDev
+	}
+
+	resp, err := globalSubnetConfig.Post(url, nil)
+	if err != nil {
+		logger.LogIf(ctx, fmt.Errorf("error from %s: %w", url, err))
+		return
+	}
+
+	r := gjson.Parse(resp).Get("license")
+	if r.Index == 0 {
+		logger.LogIf(ctx, fmt.Errorf("license not found in response from %s", url))
+		return
+	}
+
+	lic := r.String()
+	if lic == globalSubnetConfig.License {
+		// license hasn't changed.
+		return
+	}
+
+	kv := "subnet license=" + lic
+	result, err := setConfigKV(ctx, objectAPI, []byte(kv))
+	if err != nil {
+		logger.LogIf(ctx, fmt.Errorf("error setting subnet license config: %w", err))
+		return
+	}
+
+	if result.Dynamic {
+		if err := applyDynamicConfigForSubSys(GlobalContext, objectAPI, result.Cfg, result.SubSys); err != nil {
+			logger.LogIf(ctx, fmt.Errorf("error applying subnet dynamic config: %w", err))
+			return
+		}
+		globalNotificationSys.SignalConfigReload(result.SubSys)
+	}
+}