Fixes #29. If a previously cached UUID no longer exists, it will be invalidated and re-requested

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased] - xxxx-xx-xx
+### Fixed
+- [#29](https://github.com/elyby/chrly/issues/29) If a previously cached UUID no longer exists,
+  it will be invalidated and re-requested.
+- Use correct status code for error about empty response from Mojang's API.
 
 ## [4.5.0] - 2020-05-01
 ### Added

api/mojang/mojang.go

@@ -166,7 +166,7 @@ type EmptyResponse struct {
 }
 
 func (*EmptyResponse) Error() string {
-	return "200: Empty Response"
+	return "204: Empty Response"
 }
 
 func (*EmptyResponse) IsMojangError() bool {

api/mojang/mojang_test.go

@@ -261,7 +261,7 @@ func TestUuidToTextures(t *testing.T) {
 		result, err := UuidToTextures("4566e69fc90748ee8d71d7ba5aa00d20", false)
 		assert.Nil(result)
 		assert.IsType(&EmptyResponse{}, err)
-		assert.EqualError(err, "200: Empty Response")
+		assert.EqualError(err, "204: Empty Response")
 		assert.Implements((*ResponseError)(nil), err)
 	})
 

mojangtextures/mojang_textures.go

@@ -135,7 +135,8 @@ func (ctx *Provider) getResultAndBroadcast(username string, uuid string) {
 	ctx.broadcaster.BroadcastAndRemove(username, result)
 }
 
-func (ctx *Provider) getResult(username string, uuid string) *broadcastResult {
+func (ctx *Provider) getResult(username string, cachedUuid string) *broadcastResult {
+	uuid := cachedUuid
 	if uuid == "" {
 		profile, err := ctx.getUuid(username)
 		if err != nil {
@@ -156,6 +157,12 @@ func (ctx *Provider) getResult(username string, uuid string) *broadcastResult {
 
 	textures, err := ctx.getTextures(uuid)
 	if err != nil {
+		// Previously cached UUIDs may disappear
+		// In this case we must invalidate UUID cache for given username
+		if _, ok := err.(*mojang.EmptyResponse); ok && cachedUuid != "" {
+			return ctx.getResult(username, "")
+		}
+
 		return &broadcastResult{nil, err}
 	}
 

mojangtextures/mojang_textures_test.go

@@ -314,6 +314,42 @@ func (suite *providerTestSuite) TestGetForUsernameWhichHasMojangAccountButHasNoM
 	suite.Assert().Nil(err)
 }
 
+// https://github.com/elyby/chrly/issues/29
+func (suite *providerTestSuite) TestGetForUsernameWithCachedUuidThatHasBeenDisappeared() {
+	expectedErr := &mojang.EmptyResponse{}
+	expectedProfile := &mojang.ProfileInfo{Id: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", Name: "username"}
+	var nilTexturesResponse *mojang.SignedTexturesResponse
+	expectedResult := &mojang.SignedTexturesResponse{Id: "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", Name: "username"}
+
+	suite.Emitter.On("Emit", "mojang_textures:call", "username").Once()
+	suite.Emitter.On("Emit", "mojang_textures:usernames:before_cache", "username").Once()
+	suite.Emitter.On("Emit", "mojang_textures:usernames:after_cache", "username", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", true, nil).Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:before_cache", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:after_cache", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", nilTexturesResponse, nil).Once()
+	suite.Emitter.On("Emit", "mojang_textures:before_result", "username", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:before_call", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:after_call", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", nilTexturesResponse, expectedErr).Once()
+	suite.Emitter.On("Emit", "mojang_textures:usernames:before_call", "username").Once()
+	suite.Emitter.On("Emit", "mojang_textures:usernames:after_call", "username", expectedProfile, nil).Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:before_call", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb").Once()
+	suite.Emitter.On("Emit", "mojang_textures:textures:after_call", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", expectedResult, nil).Once()
+	suite.Emitter.On("Emit", "mojang_textures:after_result", "username", expectedResult, nil).Once()
+
+	suite.Storage.On("GetUuid", "username").Once().Return("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", true, nil)
+	suite.Storage.On("GetTextures", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").Once().Return(nil, nil)
+	suite.Storage.On("StoreUuid", "username", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb").Once().Return(nil)
+	suite.Storage.On("StoreTextures", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb", expectedResult).Once()
+
+	suite.UuidsProvider.On("GetUuid", "username").Return(expectedProfile, nil)
+	suite.TexturesProvider.On("GetTextures", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa").Return(nil, expectedErr)
+	suite.TexturesProvider.On("GetTextures", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb").Return(expectedResult, nil)
+
+	result, err := suite.Provider.GetForUsername("username")
+
+	suite.Assert().Nil(err)
+	suite.Assert().Equal(expectedResult, result)
+}
+
 func (suite *providerTestSuite) TestGetForTheSameUsernames() {
 	expectedProfile := &mojang.ProfileInfo{Id: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", Name: "username"}
 	expectedResult := &mojang.SignedTexturesResponse{Id: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", Name: "username"}