Fix Readiness check (#8681)

- Remove goroutine-check in Readiness check
- Bring in quorum check for readiness

Fixes #8385

Co-authored-by: Harshavardhana <harsha@minio.io>

cmd/gateway/azure/gateway-azure.go

@@ -1296,3 +1296,8 @@ func (a *azureObjects) DeleteBucketPolicy(ctx context.Context, bucket string) er
 func (a *azureObjects) IsCompressionSupported() bool {
 	return false
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (a *azureObjects) IsReady(ctx context.Context) bool {
+	return minio.IsBackendOnline(ctx, a.httpClient, a.endpoint)
+}

cmd/gateway/b2/gateway-b2.go

@@ -862,3 +862,8 @@ func (l *b2Objects) DeleteBucketPolicy(ctx context.Context, bucket string) error
 func (l *b2Objects) IsCompressionSupported() bool {
 	return false
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (l *b2Objects) IsReady(ctx context.Context) bool {
+	return minio.IsBackendOnline(ctx, l.httpClient, "https://api.backblazeb2.com/b2api/v1")
+}

cmd/gateway/gcs/gateway-gcs.go

@@ -1467,3 +1467,8 @@ func (l *gcsGateway) DeleteBucketPolicy(ctx context.Context, bucket string) erro
 func (l *gcsGateway) IsCompressionSupported() bool {
 	return false
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (l *gcsGateway) IsReady(ctx context.Context) bool {
+	return minio.IsBackendOnline(ctx, l.httpClient, "https://storage.googleapis.com")
+}

cmd/gateway/hdfs/gateway-hdfs.go

@@ -715,3 +715,8 @@ func (n *hdfsObjects) AbortMultipartUpload(ctx context.Context, bucket, object,
 	}
 	return hdfsToObjectErr(ctx, n.clnt.Remove(minio.PathJoin(hdfsSeparator, minioMetaTmpBucket, uploadID)), bucket, object, uploadID)
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (n *hdfsObjects) IsReady(_ context.Context) bool {
+	return true
+}

cmd/gateway/nas/gateway-nas.go

@@ -117,3 +117,9 @@ func (n *nasObjects) StorageInfo(ctx context.Context) minio.StorageInfo {
 type nasObjects struct {
 	minio.ObjectLayer
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (n *nasObjects) IsReady(ctx context.Context) bool {
+	sinfo := n.ObjectLayer.StorageInfo(ctx)
+	return sinfo.Backend.Type == minio.BackendFS
+}

cmd/gateway/oss/gateway-oss.go

@@ -1098,3 +1098,8 @@ func (l *ossObjects) DeleteBucketPolicy(ctx context.Context, bucket string) erro
 func (l *ossObjects) IsCompressionSupported() bool {
 	return false
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (l *ossObjects) IsReady(ctx context.Context) bool {
+	return minio.IsBackendOnline(ctx, l.Client.HTTPClient, l.Client.Config.Endpoint)
+}

cmd/gateway/s3/gateway-s3.go

@@ -670,3 +670,8 @@ func (l *s3Objects) IsCompressionSupported() bool {
 func (l *s3Objects) IsEncryptionSupported() bool {
 	return minio.GlobalKMS != nil || len(minio.GlobalGatewaySSE) > 0
 }
+
+// IsReady returns whether the layer is ready to take requests.
+func (l *s3Objects) IsReady(ctx context.Context) bool {
+	return minio.IsBackendOnline(ctx, l.HTTPClient, l.Client.EndpointURL().String())
+}