Add KMS UI (#2377)

Adds components to interact with KMS server connected to minio

restapi/admin_kms.go

@@ -20,6 +20,7 @@ package restapi
 import (
 	"context"
 	"encoding/json"
+	"sort"
 
 	"github.com/go-openapi/runtime/middleware"
 	"github.com/minio/console/models"
@@ -120,7 +121,7 @@ func kmsMetrics(ctx context.Context, minioClient MinioAdmin) (*models.KmsMetrics
 		RequestActive:    &metrics.RequestActive,
 		AuditEvents:      &metrics.AuditEvents,
 		ErrorEvents:      &metrics.ErrorEvents,
-		LatencyHistogram: nil,
+		LatencyHistogram: parseHistogram(metrics.LatencyHistogram),
 		Uptime:           &metrics.UpTime,
 		Cpus:             &metrics.CPUs,
 		UsableCPUs:       &metrics.UsableCPUs,
@@ -131,6 +132,17 @@ func kmsMetrics(ctx context.Context, minioClient MinioAdmin) (*models.KmsMetrics
 	}, nil
 }
 
+func parseHistogram(histogram map[int64]int64) (records []*models.KmsLatencyHistogram) {
+	for duration, total := range histogram {
+		records = append(records, &models.KmsLatencyHistogram{Duration: duration, Total: total})
+	}
+	cp := func(i, j int) bool {
+		return records[i].Duration < records[j].Duration
+	}
+	sort.Slice(records, cp)
+	return records
+}
+
 func GetKMSAPIsResponse(session *models.Principal, params kmsAPI.KMSAPIsParams) (*models.KmsAPIsResponse, *models.Error) {
 	ctx, cancel := context.WithCancel(params.HTTPRequest.Context())
 	defer cancel()

restapi/embedded_spec.go

@@ -6249,6 +6249,9 @@ func init() {
       "properties": {
         "duration": {
           "type": "integer"
+        },
+        "total": {
+          "type": "integer"
         }
       }
     },
@@ -6319,7 +6322,10 @@ func init() {
           "type": "integer"
         },
         "latencyHistogram": {
-          "$ref": "#/definitions/kmsLatencyHistogram"
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/kmsLatencyHistogram"
+          }
         },
         "requestActive": {
           "type": "integer"
@@ -14817,6 +14823,9 @@ func init() {
       "properties": {
         "duration": {
           "type": "integer"
+        },
+        "total": {
+          "type": "integer"
         }
       }
     },
@@ -14887,7 +14896,10 @@ func init() {
           "type": "integer"
         },
         "latencyHistogram": {
-          "$ref": "#/definitions/kmsLatencyHistogram"
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/kmsLatencyHistogram"
+          }
         },
         "requestActive": {
           "type": "integer"