mirror of
https://github.com/elyby/chrly.git
synced 2024-12-11 15:59:18 +05:30
476 lines
20 KiB
Go
476 lines
20 KiB
Go
package queue
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import (
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"crypto/rand"
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"encoding/base64"
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"net"
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"strings"
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"syscall"
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"time"
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"github.com/elyby/chrly/api/mojang"
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mocks "github.com/elyby/chrly/tests"
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"github.com/stretchr/testify/mock"
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"github.com/stretchr/testify/suite"
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"testing"
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)
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type mojangApiMocks struct {
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mock.Mock
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}
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func (o *mojangApiMocks) UsernamesToUuids(usernames []string) ([]*mojang.ProfileInfo, error) {
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args := o.Called(usernames)
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var result []*mojang.ProfileInfo
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if casted, ok := args.Get(0).([]*mojang.ProfileInfo); ok {
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result = casted
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}
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return result, args.Error(1)
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}
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func (o *mojangApiMocks) UuidToTextures(uuid string, signed bool) (*mojang.SignedTexturesResponse, error) {
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args := o.Called(uuid, signed)
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var result *mojang.SignedTexturesResponse
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if casted, ok := args.Get(0).(*mojang.SignedTexturesResponse); ok {
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result = casted
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}
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return result, args.Error(1)
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}
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type mockStorage struct {
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mock.Mock
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}
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func (m *mockStorage) GetUuid(username string) (string, error) {
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args := m.Called(username)
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return args.String(0), args.Error(1)
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}
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func (m *mockStorage) StoreUuid(username string, uuid string) {
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m.Called(username, uuid)
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}
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func (m *mockStorage) GetTextures(uuid string) (*mojang.SignedTexturesResponse, error) {
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args := m.Called(uuid)
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var result *mojang.SignedTexturesResponse
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if casted, ok := args.Get(0).(*mojang.SignedTexturesResponse); ok {
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result = casted
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}
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return result, args.Error(1)
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}
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func (m *mockStorage) StoreTextures(textures *mojang.SignedTexturesResponse) {
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m.Called(textures)
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}
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type queueTestSuite struct {
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suite.Suite
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Queue *JobsQueue
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Storage *mockStorage
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MojangApi *mojangApiMocks
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Logger *mocks.WdMock
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Iterate func()
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iterateChan chan bool
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done func()
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}
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func (suite *queueTestSuite) SetupSuite() {
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uuidsQueuePeriod = 0
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}
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func (suite *queueTestSuite) SetupTest() {
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suite.Storage = &mockStorage{}
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suite.Logger = &mocks.WdMock{}
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suite.Queue = &JobsQueue{Storage: suite.Storage, Logger: suite.Logger}
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suite.iterateChan = make(chan bool)
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forever = func() bool {
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return <-suite.iterateChan
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}
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suite.Iterate = func() {
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suite.iterateChan <- true
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}
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suite.done = func() {
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suite.iterateChan <- false
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}
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suite.MojangApi = new(mojangApiMocks)
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usernamesToUuids = suite.MojangApi.UsernamesToUuids
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uuidToTextures = suite.MojangApi.UuidToTextures
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}
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func (suite *queueTestSuite) TearDownTest() {
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suite.done()
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suite.MojangApi.AssertExpectations(suite.T())
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suite.Storage.AssertExpectations(suite.T())
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suite.Logger.AssertExpectations(suite.T())
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}
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func (suite *queueTestSuite) TestReceiveTexturesForOneUsernameWithoutAnyCache() {
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expectedResult := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything)
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suite.Logger.On("IncCounter", "mojang_textures.textures.request", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.textures.request_time", mock.Anything).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_hit", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
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suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("StoreTextures", expectedResult).Once()
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suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
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{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
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}, nil)
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suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(expectedResult, nil)
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resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
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suite.Iterate()
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result := <-resultChan
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suite.Assert().Equal(expectedResult, result)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForFewUsernamesWithoutAnyCache() {
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expectedResult1 := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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expectedResult2 := &mojang.SignedTexturesResponse{Id: "4566e69fc90748ee8d71d7ba5aa00d20", Name: "Thinkofdeath"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Twice()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Twice()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(2)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything)
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suite.Logger.On("IncCounter", "mojang_textures.textures.request", int64(1)).Twice()
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suite.Logger.On("RecordTimer", "mojang_textures.textures.request_time", mock.Anything).Twice()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_hit", int64(1)).Twice()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Twice()
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suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
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suite.Storage.On("GetUuid", "Thinkofdeath").Once().Return("", &ValueNotFound{})
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suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
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suite.Storage.On("StoreUuid", "Thinkofdeath", "4566e69fc90748ee8d71d7ba5aa00d20").Once()
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("GetTextures", "4566e69fc90748ee8d71d7ba5aa00d20").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("StoreTextures", expectedResult1).Once()
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suite.Storage.On("StoreTextures", expectedResult2).Once()
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suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb", "Thinkofdeath"}).Once().Return([]*mojang.ProfileInfo{
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{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
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{Id: "4566e69fc90748ee8d71d7ba5aa00d20", Name: "Thinkofdeath"},
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}, nil)
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suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(expectedResult1, nil)
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suite.MojangApi.On("UuidToTextures", "4566e69fc90748ee8d71d7ba5aa00d20", true).Once().Return(expectedResult2, nil)
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resultChan1 := suite.Queue.GetTexturesForUsername("maksimkurb")
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resultChan2 := suite.Queue.GetTexturesForUsername("Thinkofdeath")
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suite.Iterate()
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suite.Assert().Equal(expectedResult1, <-resultChan1)
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suite.Assert().Equal(expectedResult2, <-resultChan2)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForUsernameWithCachedUuid() {
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expectedResult := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.cache_hit", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.textures.request", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.textures.request_time", mock.Anything).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Once().Return("0d252b7218b648bfb86c2ae476954d32", nil)
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// Storage.StoreUuid shouldn't be called
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("StoreTextures", expectedResult).Once()
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// MojangApi.UsernamesToUuids shouldn't be called
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suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(expectedResult, nil)
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resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
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// Note that there is no iteration
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result := <-resultChan
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suite.Assert().Equal(expectedResult, result)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForUsernameWithFullyCachedResult() {
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expectedResult := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.cache_hit", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.textures.cache_hit", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Once().Return("0d252b7218b648bfb86c2ae476954d32", nil)
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// Storage.StoreUuid shouldn't be called
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(expectedResult, nil)
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// Storage.StoreTextures shouldn't be called
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// MojangApi.UsernamesToUuids shouldn't be called
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// MojangApi.UuidToTextures shouldn't be called
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resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
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// Note that there is no iteration
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result := <-resultChan
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suite.Assert().Equal(expectedResult, result)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForUsernameWithCachedUnknownUuid() {
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.cache_hit_nil", int64(1)).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", nil)
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// Storage.StoreUuid shouldn't be called
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// Storage.GetTextures shouldn't be called
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// Storage.StoreTextures shouldn't be called
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// MojangApi.UsernamesToUuids shouldn't be called
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// MojangApi.UuidToTextures shouldn't be called
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resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
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// Note that there is no iteration
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suite.Assert().Nil(<-resultChan)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForMoreThan100Usernames() {
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usernames := make([]string, 120, 120)
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for i := 0; i < 120; i++ {
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usernames[i] = randStr(8)
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}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Times(120)
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Times(120)
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(100)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(20)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(20)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything).Twice()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_miss", int64(1)).Times(120)
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Times(120)
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suite.Storage.On("GetUuid", mock.Anything).Times(120).Return("", &ValueNotFound{})
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suite.Storage.On("StoreUuid", mock.Anything, "").Times(120) // if username is not compared to uuid, then receive ""
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// Storage.GetTextures and Storage.SetTextures shouldn't be called
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suite.MojangApi.On("UsernamesToUuids", usernames[0:100]).Once().Return([]*mojang.ProfileInfo{}, nil)
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suite.MojangApi.On("UsernamesToUuids", usernames[100:120]).Once().Return([]*mojang.ProfileInfo{}, nil)
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channels := make([]chan *mojang.SignedTexturesResponse, 120)
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for i, username := range usernames {
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channels[i] = suite.Queue.GetTexturesForUsername(username)
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}
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suite.Iterate()
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suite.Iterate()
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for _, channel := range channels {
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<-channel
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}
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}
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func (suite *queueTestSuite) TestReceiveTexturesForTheSameUsernames() {
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expectedResult := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Twice()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.already_in_queue", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything)
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suite.Logger.On("IncCounter", "mojang_textures.textures.request", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.textures.request_time", mock.Anything).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_hit", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Twice().Return("", &ValueNotFound{})
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suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("StoreTextures", expectedResult).Once()
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suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
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{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
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}, nil)
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suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(expectedResult, nil)
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resultChan1 := suite.Queue.GetTexturesForUsername("maksimkurb")
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resultChan2 := suite.Queue.GetTexturesForUsername("maksimkurb")
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suite.Iterate()
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suite.Assert().Equal(expectedResult, <-resultChan1)
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suite.Assert().Equal(expectedResult, <-resultChan2)
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}
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func (suite *queueTestSuite) TestReceiveTexturesForUsernameThatAlreadyProcessing() {
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expectedResult := &mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"}
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Twice()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.already_in_queue", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything)
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suite.Logger.On("IncCounter", "mojang_textures.textures.request", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.textures.request_time", mock.Anything).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_hit", int64(1)).Once()
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suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
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suite.Storage.On("GetUuid", "maksimkurb").Twice().Return("", &ValueNotFound{})
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suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32").Once()
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suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Once().Return(nil, &ValueNotFound{})
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suite.Storage.On("StoreTextures", expectedResult).Once()
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suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
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{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
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}, nil)
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suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).
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Once().
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After(10*time.Millisecond). // Simulate long round trip
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Return(expectedResult, nil)
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resultChan1 := suite.Queue.GetTexturesForUsername("maksimkurb")
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// Note that for entire test there is only one iteration
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suite.Iterate()
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// Let it meet delayed UuidToTextures request
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time.Sleep(5 * time.Millisecond)
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resultChan2 := suite.Queue.GetTexturesForUsername("maksimkurb")
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suite.Assert().Equal(expectedResult, <-resultChan1)
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suite.Assert().Equal(expectedResult, <-resultChan2)
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}
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func (suite *queueTestSuite) TestDoNothingWhenNoTasks() {
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suite.Logger.On("IncCounter", "mojang_textures.request", int64(1)).Once()
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suite.Logger.On("IncCounter", "mojang_textures.usernames.queued", int64(1)).Once()
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suite.Logger.On("UpdateGauge", "mojang_textures.usernames.iteration_size", int64(1)).Once()
|
|
suite.Logger.On("UpdateGauge", "mojang_textures.usernames.queue_size", int64(0)).Once()
|
|
suite.Logger.On("RecordTimer", "mojang_textures.usernames.round_time", mock.Anything)
|
|
suite.Logger.On("IncCounter", "mojang_textures.usernames.uuid_miss", int64(1)).Once()
|
|
suite.Logger.On("RecordTimer", "mojang_textures.result_time", mock.Anything).Once()
|
|
|
|
suite.Storage.On("GetUuid", "maksimkurb").Once().Return("", &ValueNotFound{})
|
|
suite.Storage.On("StoreUuid", "maksimkurb", "").Once()
|
|
// Storage.GetTextures and Storage.StoreTextures shouldn't be called
|
|
|
|
suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{}, nil)
|
|
|
|
// Perform first iteration and await it finish
|
|
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
|
|
|
|
suite.Iterate()
|
|
|
|
suite.Assert().Nil(<-resultChan)
|
|
|
|
// Let it to perform a few more iterations to ensure, that there is no calls to external APIs
|
|
suite.Iterate()
|
|
suite.Iterate()
|
|
}
|
|
|
|
type timeoutError struct {
|
|
}
|
|
|
|
func (*timeoutError) Error() string { return "timeout error" }
|
|
func (*timeoutError) Timeout() bool { return true }
|
|
func (*timeoutError) Temporary() bool { return false }
|
|
|
|
var expectedErrors = []error{
|
|
&mojang.BadRequestError{},
|
|
&mojang.TooManyRequestsError{},
|
|
&mojang.ServerError{},
|
|
&timeoutError{},
|
|
&net.OpError{Op: "read"},
|
|
&net.OpError{Op: "dial"},
|
|
syscall.ECONNREFUSED,
|
|
}
|
|
|
|
func (suite *queueTestSuite) TestShouldNotPanicWhenExpectedErrorReturnedFromUsernameToUuidRequest() {
|
|
suite.Logger.On("IncCounter", mock.Anything, mock.Anything)
|
|
suite.Logger.On("UpdateGauge", mock.Anything, mock.Anything)
|
|
suite.Logger.On("RecordTimer", mock.Anything, mock.Anything)
|
|
suite.Logger.On("Debug", "Got response error :err", mock.Anything).Times(len(expectedErrors))
|
|
suite.Logger.On("Warning", "Got 429 Too Many Requests :err", mock.Anything).Once()
|
|
|
|
suite.Storage.On("GetUuid", "maksimkurb").Return("", &ValueNotFound{})
|
|
|
|
for _, err := range expectedErrors {
|
|
suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return(nil, err)
|
|
|
|
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
|
|
suite.Iterate()
|
|
suite.Assert().Nil(<-resultChan)
|
|
suite.MojangApi.AssertExpectations(suite.T())
|
|
suite.MojangApi.ExpectedCalls = nil // https://github.com/stretchr/testify/issues/558#issuecomment-372112364
|
|
}
|
|
}
|
|
|
|
func (suite *queueTestSuite) TestShouldNotPanicWhenExpectedErrorReturnedFromUuidToTexturesRequest() {
|
|
suite.Logger.On("IncCounter", mock.Anything, mock.Anything)
|
|
suite.Logger.On("UpdateGauge", mock.Anything, mock.Anything)
|
|
suite.Logger.On("RecordTimer", mock.Anything, mock.Anything)
|
|
suite.Logger.On("Debug", "Got response error :err", mock.Anything).Times(len(expectedErrors))
|
|
suite.Logger.On("Warning", "Got 429 Too Many Requests :err", mock.Anything).Once()
|
|
|
|
suite.Storage.On("GetUuid", "maksimkurb").Return("", &ValueNotFound{})
|
|
suite.Storage.On("StoreUuid", "maksimkurb", "0d252b7218b648bfb86c2ae476954d32")
|
|
suite.Storage.On("GetTextures", "0d252b7218b648bfb86c2ae476954d32").Return(nil, &ValueNotFound{})
|
|
// Storage.StoreTextures shouldn't be called
|
|
|
|
for _, err := range expectedErrors {
|
|
suite.MojangApi.On("UsernamesToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
|
|
{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
|
|
}, nil)
|
|
suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(nil, err)
|
|
|
|
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
|
|
suite.Iterate()
|
|
suite.Assert().Nil(<-resultChan)
|
|
suite.MojangApi.AssertExpectations(suite.T())
|
|
suite.MojangApi.ExpectedCalls = nil // https://github.com/stretchr/testify/issues/558#issuecomment-372112364
|
|
}
|
|
}
|
|
|
|
func (suite *queueTestSuite) TestReceiveTexturesForNotAllowedMojangUsername() {
|
|
suite.Logger.On("IncCounter", "mojang_textures.invalid_username", int64(1)).Once()
|
|
|
|
resultChan := suite.Queue.GetTexturesForUsername("Not allowed")
|
|
suite.Assert().Nil(<-resultChan)
|
|
}
|
|
|
|
func TestJobsQueueSuite(t *testing.T) {
|
|
suite.Run(t, new(queueTestSuite))
|
|
}
|
|
|
|
var replacer = strings.NewReplacer("-", "_", "=", "")
|
|
|
|
// https://stackoverflow.com/a/50581165
|
|
func randStr(len int) string {
|
|
buff := make([]byte, len)
|
|
_, _ = rand.Read(buff)
|
|
str := replacer.Replace(base64.URLEncoding.EncodeToString(buff))
|
|
|
|
// Base 64 can be longer than len
|
|
return str[:len]
|
|
}
|