#1: Handle Mojang's server errors too

api/mojang/mojang.go

@@ -89,11 +89,13 @@ func UuidToTextures(uuid string, signed bool) (*SignedTexturesResponse, error) {
 }
 
 func validateResponse(response *http.Response) error {
-	switch response.StatusCode {
-	case 204:
+	switch {
+	case response.StatusCode == 204:
 		return &EmptyResponse{}
-	case 429:
+	case response.StatusCode == 429:
 		return &TooManyRequestsError{}
+	case response.StatusCode >= 500:
+		return &ServerError{response.StatusCode}
 	}
 
 	return nil
@@ -115,3 +117,12 @@ type TooManyRequestsError struct {
 func (*TooManyRequestsError) Error() string {
 	return "Too Many Requests"
 }
+
+// ServerError happens when Mojang's API returns any response with 50* status
+type ServerError struct {
+	Status int
+}
+
+func (e *ServerError) Error() string {
+	return "Server error"
+}

api/mojang/mojang_test.go

@@ -51,7 +51,7 @@ func TestUsernamesToUuids(t *testing.T) {
 		}
 	})
 
-	t.Run("handle too many requests error", func(t *testing.T) {
+	t.Run("handle too many requests response", func(t *testing.T) {
 		assert := testify.New(t)
 
 		defer gock.Off()
@@ -73,6 +73,27 @@ func TestUsernamesToUuids(t *testing.T) {
 		assert.IsType(&TooManyRequestsError{}, err)
 		assert.EqualError(err, "Too Many Requests")
 	})
+
+	t.Run("handle server error", func(t *testing.T) {
+		assert := testify.New(t)
+
+		defer gock.Off()
+		gock.New("https://api.mojang.com").
+			Post("/profiles/minecraft").
+			Reply(500).
+			BodyString("500 Internal Server Error")
+
+		client := &http.Client{}
+		gock.InterceptClient(client)
+
+		HttpClient = client
+
+		result, err := UsernamesToUuids([]string{"Thinkofdeath", "maksimkurb"})
+		assert.Nil(result)
+		assert.IsType(&ServerError{}, err)
+		assert.EqualError(err, "Server error")
+		assert.Equal(500, err.(*ServerError).Status)
+	})
 }
 
 func TestUuidToTextures(t *testing.T) {
@@ -188,4 +209,25 @@ func TestUuidToTextures(t *testing.T) {
 		assert.IsType(&TooManyRequestsError{}, err)
 		assert.EqualError(err, "Too Many Requests")
 	})
+
+	t.Run("handle server error", func(t *testing.T) {
+		assert := testify.New(t)
+
+		defer gock.Off()
+		gock.New("https://sessionserver.mojang.com").
+			Get("/session/minecraft/profile/4566e69fc90748ee8d71d7ba5aa00d20").
+			Reply(500).
+			BodyString("500 Internal Server Error")
+
+		client := &http.Client{}
+		gock.InterceptClient(client)
+
+		HttpClient = client
+
+		result, err := UuidToTextures("4566e69fc90748ee8d71d7ba5aa00d20", false)
+		assert.Nil(result)
+		assert.IsType(&ServerError{}, err)
+		assert.EqualError(err, "Server error")
+		assert.Equal(500, err.(*ServerError).Status)
+	})
 }

api/mojang/queue/queue.go

@@ -101,7 +101,7 @@ func (ctx *JobsQueue) queueRound() {
 
 	profiles, err := usernamesToUuids(usernames)
 	switch err.(type) {
-	case *mojang.TooManyRequestsError:
+	case *mojang.TooManyRequestsError, *mojang.ServerError:
 		for _, job := range jobs {
 			job.RespondTo <- nil
 		}
@@ -147,8 +147,7 @@ func (ctx *JobsQueue) getTextures(uuid string) *mojang.SignedTexturesResponse {
 	shouldCache := true
 	result, err := uuidToTextures(uuid, true)
 	switch err.(type) {
-	case *mojang.EmptyResponse:
-	case *mojang.TooManyRequestsError:
+	case *mojang.EmptyResponse, *mojang.TooManyRequestsError, *mojang.ServerError:
 		shouldCache = false
 	case error:
 		panic(err)

api/mojang/queue/queue_test.go

@@ -305,6 +305,18 @@ func (suite *QueueTestSuite) TestHandleTooManyRequestsResponseWhenExchangingUser
 	suite.Assert().Nil(<-resultChan)
 }
 
+func (suite *QueueTestSuite) TestHandleServerErrorWhenExchangingUsernamesToUuids() {
+	suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
+	// Storage.StoreUuid, Storage.GetTextures and Storage.StoreTextures shouldn't be called
+	suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb"}).Once().Return(nil, &mojang.ServerError{Status: 500})
+
+	resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
+
+	suite.Iterate()
+
+	suite.Assert().Nil(<-resultChan)
+}
+
 func (suite *QueueTestSuite) TestHandleEmptyResponseWhenRequestingUsersTextures() {
 	suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
 	suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
@@ -345,6 +357,26 @@ func (suite *QueueTestSuite) TestHandleTooManyRequestsResponseWhenRequestingUser
 	suite.Assert().Nil(<-resultChan)
 }
 
+func (suite *QueueTestSuite) TestHandleServerErrorWhenRequestingUsersTextures() {
+	suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
+	suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
+	suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
+	// Storage.StoreTextures shouldn't be called
+	suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
+		{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
+	}, nil)
+	suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(
+		nil,
+		&mojang.ServerError{Status: 500},
+	)
+
+	resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
+
+	suite.Iterate()
+
+	suite.Assert().Nil(<-resultChan)
+}
+
 func (suite *QueueTestSuite) TestReceiveTexturesForNotAllowedMojangUsername() {
 	resultChan := suite.Queue.GetTexturesForUsername("Not allowed")
 	suite.Assert().Nil(<-resultChan)