return formated error struct for status code 400

Signed-off-by: Leslie Wang <[email protected]>

client.go

@@ -303,7 +303,11 @@ func (c *APIClient) runRequest(method string, url string, payload interface{}) (
 			return nil, err
 		}
 		defer resp.Body.Close()
-		return nil, fmt.Errorf("%d: %s", resp.StatusCode, string(payload))
+		if resp.StatusCode != 400 {
+			return nil, fmt.Errorf("%d: %s", resp.StatusCode, string(payload))
+		}
+
+		return nil, common.ConstructError(resp.StatusCode, payload)
 	}
 
 	return resp, err

client_test.go

@@ -0,0 +1,90 @@
+//
+// SPDX-License-Identifier: BSD-3-Clause
+//
+
+package gofish
+
+import (
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stmcginnis/gofish/common"
+)
+
+const (
+	errMsg = `{
+      "code": "Base.1.0.GeneralError",
+      "message": "A general error has occurred. See ExtendedInfo for more information.",
+      "@Message.ExtendedInfo": [
+          {
+              "MessageId": "Base.1.0.PropertyValueNotInList",
+              "Message": "The value Red for the property IndicatorLED is not in the list of acceptable values",
+              "MessageArgs": [
+                  "RED",
+                  "IndicatorLED"
+              ],
+              "Severity": "Warning",
+              "Resolution": "Remove the property from the request body and resubmit the request if the operation failed"
+          },
+          {
+              "MessageId": "Base.1.0.PropertyNotWriteable",
+              "Message": "The property SKU is a read only property and cannot be assigned a value",
+              "MessageArgs": [
+                  "SKU"
+              ],
+              "Severity": "Warning",
+              "Resolution": "Remove the property from the request body and resubmit the request if the operation failed"
+          }
+      ]
+  }`
+	expectErrorStatus400 = `{"error": ` + errMsg + "}"
+	expectErrorStatus404 = `404: {"error": ` + errMsg + "}"
+)
+
+// TestError400 tests the parsing of error reply.
+func TestError400(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(400)
+		w.Write([]byte(expectErrorStatus400))
+	}))
+	defer ts.Close()
+
+	_, err := Connect(ClientConfig{Endpoint: ts.URL, HTTPClient: ts.Client()})
+	if err == nil {
+		t.Error("Update call should fail")
+	}
+	errStruct, ok := err.(*common.Error)
+	if !ok {
+		t.Errorf("400 should return known error type: %v", err)
+	}
+	errBody, err := json.MarshalIndent(errStruct, "  ", "    ")
+	if err != nil {
+		t.Errorf("Marshall error %v got: %s", errStruct, err)
+	}
+	if errMsg != string(errBody) {
+		t.Errorf("Expect:\n%s\nGot:\n%s", errMsg, string(errBody))
+	}
+}
+
+// TestErrorNon400 tests the parsing of error reply for non 400 reply.
+func TestErrorNon400(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(404)
+		w.Write([]byte(expectErrorStatus400))
+	}))
+	defer ts.Close()
+
+	_, err := Connect(ClientConfig{Endpoint: ts.URL, HTTPClient: ts.Client()})
+	if err == nil {
+		t.Error("Update call should fail")
+	}
+	_, ok := err.(*common.Error)
+	if ok {
+		t.Errorf("404 should not return known error type: %v", err)
+	}
+	if expectErrorStatus404 != err.Error() {
+		t.Errorf("Expect:\n%s\nGot:\n%s", expectErrorStatus404, err.Error())
+	}
+}

common/types.go

@@ -706,3 +706,49 @@ type Settings struct {
 	// resource.
 	Time string
 }
+
+// ConstructError tries to create error if body is defined as redfish spec
+func ConstructError(statusCode int, b []byte) error {
+	var err struct {
+		Error *Error
+	}
+	if e := json.Unmarshal(b, &err); e != nil || err.Error == nil{
+		// return normal error
+		return fmt.Errorf("%d: %s", statusCode, string(b))
+	}
+	err.Error.rawData = b
+	return err.Error
+}
+
+// Error is redfish error response object for 400
+type Error struct {
+	rawData []byte
+	// A string indicating a specific MessageId from the message registry.
+	Code string `json:"code"`
+	// A human readable error message corresponding to the message in the message registry.
+	Message string `json:"message"`
+	// An array of message objects describing one or more error message(s).
+	ExtendedInfos []ErrExtendedInfo `json:"@Message.ExtendedInfo"`
+}
+
+func (e *Error) Error() string {
+	return string(e.rawData)
+}
+
+// ErrExtendedInfo is for redfish ExtendedInfo error response
+// TODO: support RelatedProperties
+type ErrExtendedInfo struct {
+	// Indicating a specific error or message (not to be confused with the HTTP status code).
+	// This code can be used to access a detailed message from a message registry.
+	MessageID string `json:"MessageId"`
+	// A human readable error message indicating the semantics associated with the error.
+	// This shall be the complete message, and not rely on substitution variables.
+	Message string
+	// An optional array of strings representing the substitution parameter values for the message.
+	// This shall be included in the response if a MessageId is specified for a parameterized message.
+	MessageArgs []string
+	// An optional string representing the severity of the error.
+	Severity string
+	//An optional string describing recommended action(s) to take to resolve the error.
+	Resolution string
+}