Size suggestion from machines

cmd/metal-api/internal/service/size-service.go

@@ -59,6 +59,16 @@ func (r *sizeResource) webService() *restful.WebService {
 		Returns(http.StatusOK, "OK", []v1.SizeResponse{}).
 		DefaultReturns("Error", httperrors.HTTPErrorResponse{}))
 
+	ws.Route(ws.POST("/suggest").
+		To(r.suggestSize).
+		Operation("suggest").
+		Doc("from a given machine id returns the appropriate size").
+		Metadata(restfulspec.KeyOpenAPITags, tags).
+		Metadata(auditing.Exclude, true).
+		Reads(v1.SizeSuggestRequest{}).
+		Returns(http.StatusOK, "OK", []v1.SizeConstraint{}).
+		DefaultReturns("Error", httperrors.HTTPErrorResponse{}))
+
 	ws.Route(ws.DELETE("/{id}").
 		To(admin(r.deleteSize)).
 		Operation("deleteSize").
@@ -114,6 +124,45 @@ func (r *sizeResource) findSize(request *restful.Request, response *restful.Resp
 	r.send(request, response, http.StatusOK, v1.NewSizeResponse(s))
 }
 
+func (r *sizeResource) suggestSize(request *restful.Request, response *restful.Response) {
+	var requestPayload v1.SizeSuggestRequest
+	err := request.ReadEntity(&requestPayload)
+	if err != nil {
+		r.sendError(request, response, httperrors.BadRequest(err))
+		return
+	}
+
+	if requestPayload.MachineID == "" {
+		r.sendError(request, response, httperrors.BadRequest(fmt.Errorf("machineID must be given")))
+		return
+	}
+
+	m, err := r.ds.FindMachineByID(requestPayload.MachineID)
+	if err != nil {
+		r.sendError(request, response, defaultError(err))
+		return
+	}
+
+	r.send(request, response, http.StatusOK, []v1.SizeConstraint{
+		{
+			Type: metal.CoreConstraint,
+			Min:  uint64(m.Hardware.CPUCores),
+			Max:  uint64(m.Hardware.CPUCores),
+		},
+		{
+			Type: metal.MemoryConstraint,
+			Min:  m.Hardware.Memory,
+			Max:  m.Hardware.Memory,
+		},
+		{
+			Type: metal.StorageConstraint,
+			Min:  m.Hardware.DiskCapacity(),
+			Max:  m.Hardware.DiskCapacity(),
+		},
+	})
+
+}
+
 func (r *sizeResource) listSizes(request *restful.Request, response *restful.Response) {
 	ss, err := r.ds.ListSizes()
 	if err != nil {

cmd/metal-api/internal/service/size-service_test.go

@@ -12,6 +12,7 @@ import (
 	v1 "github.com/metal-stack/metal-api/cmd/metal-api/internal/service/v1"
 	"github.com/metal-stack/metal-api/cmd/metal-api/internal/testdata"
 	"github.com/metal-stack/metal-lib/httperrors"
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.uber.org/zap/zaptest"
 
@@ -70,6 +71,53 @@ func TestGetSize(t *testing.T) {
 	require.Equal(t, len(testdata.Sz1.Constraints), len(result.SizeConstraints))
 }
 
+func TestSuggest(t *testing.T) {
+	ds, mock := datastore.InitMockDB(t)
+	testdata.InitMockDBData(mock)
+
+	createRequest := v1.SizeSuggestRequest{
+		MachineID: "1",
+	}
+	js, err := json.Marshal(createRequest)
+	require.NoError(t, err)
+	body := bytes.NewBuffer(js)
+
+	sizeservice := NewSize(zaptest.NewLogger(t).Sugar(), ds)
+	container := restful.NewContainer().Add(sizeservice)
+	req := httptest.NewRequest("POST", "/v1/size/suggest", body)
+	req.Header.Add("Content-Type", "application/json")
+	w := httptest.NewRecorder()
+	container.ServeHTTP(w, req)
+
+	resp := w.Result()
+	defer resp.Body.Close()
+	require.Equal(t, http.StatusOK, resp.StatusCode, w.Body.String())
+	var result []v1.SizeConstraint
+	err = json.NewDecoder(resp.Body).Decode(&result)
+	require.NoError(t, err)
+
+	require.Len(t, result, 3)
+
+	assert.Contains(t, result, v1.SizeConstraint{
+		Type: metal.MemoryConstraint,
+		Min:  1 << 30,
+		Max:  1 << 30,
+	})
+
+	assert.Contains(t, result, v1.SizeConstraint{
+		Type: metal.CoreConstraint,
+		Min:  8,
+		Max:  8,
+	})
+
+	assert.Contains(t, result, v1.SizeConstraint{
+		Type: metal.StorageConstraint,
+		Min:  3000,
+		Max:  3000,
+	})
+
+}
+
 func TestGetSizeNotFound(t *testing.T) {
 	ds, mock := datastore.InitMockDB(t)
 	testdata.InitMockDBData(mock)

cmd/metal-api/internal/service/v1/size.go

@@ -26,6 +26,10 @@ type SizeResponse struct {
 	Timestamps
 }
 
+type SizeSuggestRequest struct {
+	MachineID string `json:"machineID" description:"machineID to retrieve size suggestion for"`
+}
+
 type SizeConstraintMatchingLog struct {
 	Constraint SizeConstraint `json:"constraint" description:"the size constraint to which this log relates to"`
 	Match      bool           `json:"match" description:"indicates whether the constraint matched or not"`

cmd/metal-api/internal/testdata/testdata.go

@@ -43,6 +43,22 @@ var (
 				},
 			},
 		},
+		Hardware: metal.MachineHardware{
+			CPUCores: 8,
+			Memory:   1 << 30,
+			Disks: []metal.BlockDevice{
+				{
+					Size: 1000,
+				},
+				{
+					Size: 1000,
+				},
+				{
+					Size: 1000,
+				},
+			},
+		},
+
 		IPMI: IPMI1,
 		Tags: []string{"1"},
 	}

spec/metal-api.json

@@ -4509,6 +4509,17 @@
         "id"
       ]
     },
+    "v1.SizeSuggestRequest": {
+      "properties": {
+        "machineID": {
+          "description": "machineID to retrieve size suggestion for",
+          "type": "string"
+        }
+      },
+      "required": [
+        "machineID"
+      ]
+    },
     "v1.SizeUpdateRequest": {
       "properties": {
         "constraints": {
@@ -8785,6 +8796,48 @@
         ]
       }
     },
+    "/v1/size/suggest": {
+      "post": {
+        "consumes": [
+          "application/json"
+        ],
+        "operationId": "suggest",
+        "parameters": [
+          {
+            "in": "body",
+            "name": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/v1.SizeSuggestRequest"
+            }
+          }
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "items": {
+                "$ref": "#/definitions/v1.SizeConstraint"
+              },
+              "type": "array"
+            }
+          },
+          "default": {
+            "description": "Error",
+            "schema": {
+              "$ref": "#/definitions/httperrors.HTTPErrorResponse"
+            }
+          }
+        },
+        "summary": "from a given machineID returns the appropiate size",
+        "tags": [
+          "size"
+        ]
+      }
+    },
     "/v1/size/{id}": {
       "delete": {
         "consumes": [