Make logger webhook config dynamic (#14289)

It should not be required to restart the 
server after setting the logger webhook config.

cmd/config-current.go

@@ -574,18 +574,6 @@ func lookupConfigs(s config.Config, objAPI ObjectLayer) {
 		logger.LogIf(ctx, fmt.Errorf("Unable to initialize logger/audit targets: %w", err))
 	}
 
-	for _, l := range loggerCfg.HTTP {
-		if l.Enabled {
-			l.LogOnce = logger.LogOnceIf
-			l.UserAgent = loggerUserAgent
-			l.Transport = NewGatewayHTTPTransportWithClientCerts(l.ClientCert, l.ClientKey)
-			// Enable http logging
-			if err = logger.AddTarget(http.New(l)); err != nil {
-				logger.LogIf(ctx, fmt.Errorf("Unable to initialize server logger HTTP target: %w", err))
-			}
-		}
-	}
-
 	for _, l := range loggerCfg.AuditWebhook {
 		if l.Enabled {
 			l.LogOnce = logger.LogOnceIf
@@ -663,6 +651,25 @@ func applyDynamicConfig(ctx context.Context, objAPI ObjectLayer, s config.Config
 		return fmt.Errorf("Unable to apply scanner config: %w", err)
 	}
 
+	// Logger webhook
+	loggerCfg, err := logger.LookupConfig(s)
+	if err != nil {
+		logger.LogIf(ctx, fmt.Errorf("Unable to load logger webhook config: %w", err))
+	}
+	userAgent := getUserAgent(getMinioMode())
+	for n, l := range loggerCfg.HTTP {
+		if l.Enabled {
+			l.LogOnce = logger.LogOnceIf
+			l.UserAgent = userAgent
+			l.Transport = NewGatewayHTTPTransportWithClientCerts(l.ClientCert, l.ClientKey)
+			loggerCfg.HTTP[n] = l
+		}
+	}
+	err = logger.UpdateTargets(loggerCfg)
+	if err != nil {
+		logger.LogIf(ctx, fmt.Errorf("Unable to update logger webhook config: %w", err))
+	}
+
 	// Apply configurations.
 	// We should not fail after this.
 	var setDriveCounts []int

cmd/consolelogger.go

@@ -150,6 +150,10 @@ func (sys *HTTPConsoleLoggerSys) Content() (logs []log.Entry) {
 	return
 }
 
+// Cancel - cancels the target
+func (sys *HTTPConsoleLoggerSys) Cancel() {
+}
+
 // Send log message 'e' to console and publish to console
 // log pubsub system
 func (sys *HTTPConsoleLoggerSys) Send(e interface{}, logKind string) error {

cmd/data-update-tracker_test.go

@@ -55,6 +55,9 @@ func (t *testingLogger) Init() error {
 	return nil
 }
 
+func (t *testingLogger) Cancel() {
+}
+
 func (t *testingLogger) Send(entry interface{}, errKind string) error {
 	t.mu.Lock()
 	defer t.mu.Unlock()

internal/config/config.go

@@ -166,6 +166,7 @@ var SubSystemsDynamic = set.CreateStringSet(
 	ScannerSubSys,
 	HealSubSys,
 	SubnetSubSys,
+	LoggerWebhookSubSys,
 )
 
 // SubSystemsSingleTargets - subsystems which only support single target.

internal/logger/target/http/http.go

@@ -25,6 +25,8 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
+	"sync"
+	"sync/atomic"
 	"time"
 
 	xhttp "github.com/minio/minio/internal/http"
@@ -55,6 +57,9 @@ type Config struct {
 // buffer is full, new logs are just ignored and an error
 // is returned to the caller.
 type Target struct {
+	status int32
+	wg     sync.WaitGroup
+
 	// Channel of log entries
 	logCh chan interface{}
 
@@ -109,6 +114,7 @@ func (h *Target) Init() error {
 			h.config.Endpoint, resp.Status)
 	}
 
+	h.status = 1
 	go h.startHTTPLogger()
 	return nil
 }
@@ -120,14 +126,13 @@ func acceptedResponseStatusCode(code int) bool {
 	return acceptedStatusCodeMap[code]
 }
 
-func (h *Target) startHTTPLogger() {
-	// Create a routine which sends json logs received
-	// from an internal channel.
-	go func() {
-		for entry := range h.logCh {
+func (h *Target) logEntry(entry interface{}) {
+	h.wg.Add(1)
+	defer h.wg.Done()
+
 	logJSON, err := json.Marshal(&entry)
 	if err != nil {
-				continue
+		return
 	}
 
 	ctx, cancel := context.WithTimeout(context.Background(), webhookCallTimeout)
@@ -136,7 +141,7 @@ func (h *Target) startHTTPLogger() {
 	if err != nil {
 		h.config.LogOnce(ctx, fmt.Errorf("%s returned '%w', please check your endpoint configuration", h.config.Endpoint, err), h.config.Endpoint)
 		cancel()
-				continue
+		return
 	}
 	req.Header.Set(xhttp.ContentType, "application/json")
 
@@ -153,7 +158,7 @@ func (h *Target) startHTTPLogger() {
 	cancel()
 	if err != nil {
 		h.config.LogOnce(ctx, fmt.Errorf("%s returned '%w', please check your endpoint configuration", h.config.Endpoint, err), h.config.Endpoint)
-				continue
+		return
 	}
 
 	// Drain any response.
@@ -167,6 +172,14 @@ func (h *Target) startHTTPLogger() {
 			h.config.LogOnce(ctx, fmt.Errorf("%s returned '%s', please check your endpoint configuration", h.config.Endpoint, resp.Status), h.config.Endpoint)
 		}
 	}
+}
+
+func (h *Target) startHTTPLogger() {
+	// Create a routine which sends json logs received
+	// from an internal channel.
+	go func() {
+		for entry := range h.logCh {
+			h.logEntry(entry)
 		}
 	}()
 }
@@ -184,6 +197,11 @@ func New(config Config) *Target {
 
 // Send log message 'e' to http target.
 func (h *Target) Send(entry interface{}, errKind string) error {
+	if atomic.LoadInt32(&h.status) == 0 {
+		// Channel was closed or used before init.
+		return nil
+	}
+
 	select {
 	case h.logCh <- entry:
 	default:
@@ -194,3 +212,11 @@ func (h *Target) Send(entry interface{}, errKind string) error {
 
 	return nil
 }
+
+// Cancel - cancels the target
+func (h *Target) Cancel() {
+	if atomic.CompareAndSwapInt32(&h.status, 1, 0) {
+		close(h.logCh)
+	}
+	h.wg.Wait()
+}

internal/logger/target/kafka/kafka.go

@@ -197,6 +197,10 @@ func (h *Target) Init() error {
 	return nil
 }
 
+// Cancel - cancels the target
+func (h *Target) Cancel() {
+}
+
 // New initializes a new logger target which
 // sends log over http to the specified endpoint
 func New(config Config) *Target {

internal/logger/targets.go

@@ -20,6 +20,8 @@ package logger
 import (
 	"sync"
 	"sync/atomic"
+
+	"github.com/minio/minio/internal/logger/target/http"
 )
 
 // Target is the entity that we will receive
@@ -29,6 +31,7 @@ type Target interface {
 	String() string
 	Endpoint() string
 	Init() error
+	Cancel()
 	Send(entry interface{}, errKind string) error
 }
 
@@ -108,3 +111,37 @@ func AddTarget(t Target) error {
 
 	return nil
 }
+
+func cancelAllTargets() {
+	for _, tgt := range targets {
+		tgt.Cancel()
+	}
+}
+
+func initTargets(cfg Config) (tgts []Target, err error) {
+	for _, l := range cfg.HTTP {
+		if l.Enabled {
+			t := http.New(l)
+			if err = t.Init(); err != nil {
+				return tgts, err
+			}
+			tgts = append(tgts, t)
+		}
+	}
+	return tgts, err
+}
+
+// UpdateTargets swaps targets with newly loaded ones from the cfg
+func UpdateTargets(cfg Config) error {
+	updated, err := initTargets(cfg)
+	if err != nil {
+		return err
+	}
+
+	swapMu.Lock()
+	atomic.StoreInt32(&nTargets, int32(len(updated)))
+	cancelAllTargets() // cancel running targets
+	targets = updated
+	swapMu.Unlock()
+	return nil
+}