Add metrics, version and apis handlers (#15839)

internal/kms/kes.go

@@ -139,6 +139,7 @@ func (c *kesClient) Stat(ctx context.Context) (Status, error) {
 	}, nil
 }
 
+// Metrics retrieves server metrics in the Prometheus exposition format.
 func (c *kesClient) Metrics(ctx context.Context) (kes.Metric, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
@@ -146,6 +147,22 @@ func (c *kesClient) Metrics(ctx context.Context) (kes.Metric, error) {
 	return c.client.Metrics(ctx)
 }
 
+// Version retrieves version information
+func (c *kesClient) Version(ctx context.Context) (string, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+
+	return c.client.Version(ctx)
+}
+
+// APIs retrieves a list of supported API endpoints
+func (c *kesClient) APIs(ctx context.Context) ([]kes.API, error) {
+	c.lock.RLock()
+	defer c.lock.RUnlock()
+
+	return c.client.APIs(ctx)
+}
+
 // CreateKey tries to create a new key at the KMS with the
 // given key ID.
 //

internal/kms/status-manager.go

@@ -0,0 +1,32 @@
+// Copyright (c) 2015-2022 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 kms
+
+import (
+	"context"
+
+	"github.com/minio/kes"
+)
+
+// StatusManager is the generic interface that handles KMS status operations
+type StatusManager interface {
+	// Version retrieves version information
+	Version(ctx context.Context) (string, error)
+	// APIs retrieves a list of supported API endpoints
+	APIs(ctx context.Context) ([]kes.API, error)
+}