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#1: Fix race conditions errors and rewrite tests

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This commit is contained in:
ErickSkrauch 2019-04-19 01:41:52 +03:00
parent e14619e079
commit 8244351bb5
4 changed files with 191 additions and 190 deletions
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17
Gopkg.lock generated
View File

@ -226,10 +226,23 @@
revision = "25b30aa063fc18e48662b86996252eabdcf2f0c7"
version = "v1.0.0"
[[projects]]
digest = "1:711eebe744c0151a9d09af2315f0bb729b2ec7637ef4c410fa90a18ef74b65b6"
name = "github.com/stretchr/objx"
packages = ["."]
pruneopts = ""
revision = "477a77ecc69700c7cdeb1fa9e129548e1c1c393c"
version = "v0.1.1"
[[projects]]
digest = "1:381bcbeb112a51493d9d998bbba207a529c73dbb49b3fd789e48c63fac1f192c"
name = "github.com/stretchr/testify"
packages = ["assert"]
packages = [
"assert",
"mock",
"require",
"suite",
]
pruneopts = ""
revision = "ffdc059bfe9ce6a4e144ba849dbedead332c6053"
version = "v1.3.0"
@ -303,6 +316,8 @@
"github.com/spf13/cobra",
"github.com/spf13/viper",
"github.com/stretchr/testify/assert",
"github.com/stretchr/testify/mock",
"github.com/stretchr/testify/suite",
"github.com/thedevsaddam/govalidator",
"gopkg.in/h2non/gock.v1",
]

9
api/mojang/queue/jobs_structure.go
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@ -25,24 +25,29 @@ func (s *jobsQueue) New() *jobsQueue {
func (s *jobsQueue) Enqueue(t *jobItem) {
s.lock.Lock()
defer s.lock.Unlock()
s.items = append(s.items, t)
s.lock.Unlock()
}
func (s *jobsQueue) Dequeue(n int) []*jobItem {
s.lock.Lock()
defer s.lock.Unlock()
if n > s.Size() {
n = s.Size()
}
items := s.items[0:n]
s.items = s.items[n:len(s.items)]
s.lock.Unlock()
return items
}
func (s *jobsQueue) IsEmpty() bool {
s.lock.Lock()
defer s.lock.Unlock()
return len(s.items) == 0
}

11
api/mojang/queue/queue.go
View File

@ -11,6 +11,9 @@ import (
var usernamesToUuids = mojang.UsernamesToUuids
var uuidToTextures = mojang.UuidToTextures
var delay = time.Second
var forever = func() bool {
return true
}
type JobsQueue struct {
Storage Storage
@ -19,7 +22,7 @@ type JobsQueue struct {
queue jobsQueue
}
func (ctx *JobsQueue) GetTexturesForUsername(username string) *mojang.SignedTexturesResponse {
func (ctx *JobsQueue) GetTexturesForUsername(username string) chan *mojang.SignedTexturesResponse {
ctx.onFirstCall.Do(func() {
ctx.queue.New()
ctx.startQueue()
@ -28,14 +31,15 @@ func (ctx *JobsQueue) GetTexturesForUsername(username string) *mojang.SignedText
resultChan := make(chan *mojang.SignedTexturesResponse)
// TODO: prevent of adding the same username more than once
ctx.queue.Enqueue(&jobItem{username, resultChan})
// TODO: return nil if processing takes more than 5 seconds
return <-resultChan
return resultChan
}
func (ctx *JobsQueue) startQueue() {
go func() {
time.Sleep(delay)
for true {
for forever() {
start := time.Now()
ctx.queueRound()
time.Sleep(delay - time.Since(start))
@ -81,6 +85,7 @@ func (ctx *JobsQueue) queueRound() {
}
if uuid != "" {
var err error
result, err = uuidToTextures(uuid, true)
if err != nil {
if _, ok := err.(*mojang.TooManyRequestsError); !ok {

284
api/mojang/queue/queue_test.go
View File

@ -3,211 +3,187 @@ package queue
import (
"crypto/rand"
"encoding/base64"
"errors"
"log"
"testing"
"time"
"github.com/elyby/chrly/api/mojang"
testify "github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
"github.com/stretchr/testify/suite"
"testing"
)
func TestJobsQueue_GetTexturesForUsername(t *testing.T) {
delay = 50 * time.Millisecond
type MojangApiMocks struct {
mock.Mock
}
t.Run("receive textures for one username", func(t *testing.T) {
assert := testify.New(t)
func (o *MojangApiMocks) UsernameToUuids(usernames []string) ([]*mojang.ProfileInfo, error) {
args := o.Called(usernames)
var result []*mojang.ProfileInfo
if casted, ok := args.Get(0).([]*mojang.ProfileInfo); ok {
result = casted
}
usernamesToUuids = createUsernameToUuidsMock(
assert,
[]string{"maksimkurb"},
[]*mojang.ProfileInfo{
return result, args.Error(1)
}
func (o *MojangApiMocks) UuidToTextures(uuid string, signed bool) (*mojang.SignedTexturesResponse, error) {
args := o.Called(uuid, signed)
var result *mojang.SignedTexturesResponse
if casted, ok := args.Get(0).(*mojang.SignedTexturesResponse); ok {
result = casted
}
return result, args.Error(1)
}
type QueueTestSuite struct {
suite.Suite
Queue *JobsQueue
MojangApi *MojangApiMocks
Iterate func()
iterateChan chan bool
done func()
}
func (suite *QueueTestSuite) SetupSuite() {
delay = 0
}
func (suite *QueueTestSuite) SetupTest() {
suite.Queue = &JobsQueue{}
suite.iterateChan = make(chan bool)
forever = func() bool {
return <-suite.iterateChan
}
suite.Iterate = func() {
suite.iterateChan <- true
}
suite.done = func() {
suite.iterateChan <- false
}
suite.MojangApi = new(MojangApiMocks)
usernamesToUuids = suite.MojangApi.UsernameToUuids
uuidToTextures = suite.MojangApi.UuidToTextures
}
func (suite *QueueTestSuite) TearDownTest() {
suite.done()
suite.MojangApi.AssertExpectations(suite.T())
}
func (suite *QueueTestSuite) TestReceiveTexturesForOneUsername() {
suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{
{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
},
}, nil)
suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(
&mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
nil,
)
uuidToTextures = createUuidToTextures([]*createUuidToTexturesResult{
createTexturesResult("0d252b7218b648bfb86c2ae476954d32", "maksimkurb"),
})
queue := &JobsQueue{Storage: &NilStorage{}}
result := queue.GetTexturesForUsername("maksimkurb")
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
if assert.NotNil(result) {
assert.Equal("0d252b7218b648bfb86c2ae476954d32", result.Id)
assert.Equal("maksimkurb", result.Name)
suite.Iterate()
result := <-resultChan
if suite.Assert().NotNil(result) {
suite.Assert().Equal("0d252b7218b648bfb86c2ae476954d32", result.Id)
suite.Assert().Equal("maksimkurb", result.Name)
}
})
}
t.Run("receive textures for few usernames", func(t *testing.T) {
assert := testify.New(t)
usernamesToUuids = createUsernameToUuidsMock(
assert,
[]string{"maksimkurb", "Thinkofdeath"},
[]*mojang.ProfileInfo{
func (suite *QueueTestSuite) TestReceiveTexturesForFewUsernames() {
suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb", "Thinkofdeath"}).Once().Return([]*mojang.ProfileInfo{
{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
{Id: "4566e69fc90748ee8d71d7ba5aa00d20", Name: "Thinkofdeath"},
},
}, nil)
suite.MojangApi.On("UuidToTextures", "0d252b7218b648bfb86c2ae476954d32", true).Once().Return(
&mojang.SignedTexturesResponse{Id: "0d252b7218b648bfb86c2ae476954d32", Name: "maksimkurb"},
nil,
)
suite.MojangApi.On("UuidToTextures", "4566e69fc90748ee8d71d7ba5aa00d20", true).Once().Return(
&mojang.SignedTexturesResponse{Id: "4566e69fc90748ee8d71d7ba5aa00d20", Name: "Thinkofdeath"},
nil,
)
uuidToTextures = createUuidToTextures([]*createUuidToTexturesResult{
createTexturesResult("0d252b7218b648bfb86c2ae476954d32", "maksimkurb"),
createTexturesResult("4566e69fc90748ee8d71d7ba5aa00d20", "Thinkofdeath"),
})
queue := &JobsQueue{Storage: &NilStorage{}}
resultChan1 := make(chan *mojang.SignedTexturesResponse)
resultChan2 := make(chan *mojang.SignedTexturesResponse)
go func() {
resultChan1 <- queue.GetTexturesForUsername("maksimkurb")
}()
go func() {
resultChan2 <- queue.GetTexturesForUsername("Thinkofdeath")
}()
resultChan1 := suite.Queue.GetTexturesForUsername("maksimkurb")
resultChan2 := suite.Queue.GetTexturesForUsername("Thinkofdeath")
assert.NotNil(<-resultChan1)
assert.NotNil(<-resultChan2)
})
suite.Iterate()
t.Run("query no more than 100 usernames and all left on the next iteration", func(t *testing.T) {
assert := testify.New(t)
suite.Assert().NotNil(<-resultChan1)
suite.Assert().NotNil(<-resultChan2)
}
func (suite *QueueTestSuite) TestReceiveTexturesForMoreThan100Usernames() {
usernames := make([]string, 120, 120)
for i := 0; i < 120; i++ {
usernames[i] = randStr(8)
}
usernamesToUuids = createUsernameToUuidsMock(assert, usernames[0:100], []*mojang.ProfileInfo{}, nil)
queue := &JobsQueue{Storage: &NilStorage{}}
scheduleUsername := func(username string) {
queue.GetTexturesForUsername(username)
}
suite.MojangApi.On("UsernameToUuids", usernames[0:100]).Once().Return([]*mojang.ProfileInfo{}, nil)
suite.MojangApi.On("UsernameToUuids", usernames[100:120]).Once().Return([]*mojang.ProfileInfo{}, nil)
for _, username := range usernames {
go scheduleUsername(username)
time.Sleep(50 * time.Microsecond) // Add delay to have consistent order
suite.Queue.GetTexturesForUsername(username)
}
// Let it begin first iteration
time.Sleep(delay + delay/2)
suite.Iterate()
suite.Iterate()
}
usernamesToUuids = createUsernameToUuidsMock(
assert,
usernames[100:120],
[]*mojang.ProfileInfo{},
nil,
)
time.Sleep(delay)
})
t.Run("should do nothing if queue is empty", func(t *testing.T) {
assert := testify.New(t)
usernamesToUuids = createUsernameToUuidsMock(assert, []string{"maksimkurb"}, []*mojang.ProfileInfo{}, nil)
uuidToTextures = func(uuid string, signed bool) (*mojang.SignedTexturesResponse, error) {
t.Error("this method shouldn't be called")
return nil, nil
}
func (suite *QueueTestSuite) TestDoNothingWhenNoTasks() {
suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb"}).Once().Return([]*mojang.ProfileInfo{}, nil)
// Perform first iteration and await it finish
queue := &JobsQueue{Storage: &NilStorage{}}
result := queue.GetTexturesForUsername("maksimkurb")
assert.Nil(result)
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
// Override external API call that indicates, that queue is still trying to obtain somethid
usernamesToUuids = func(usernames []string) ([]*mojang.ProfileInfo, error) {
t.Error("this method shouldn't be called")
return nil, nil
}
suite.Iterate()
// Let it to iterate few times
time.Sleep(delay * 2)
})
suite.Assert().Nil(<-resultChan)
t.Run("handle 429 error when exchanging usernames to uuids", func(t *testing.T) {
assert := testify.New(t)
// Let it to perform a few more iterations to ensure, that there is no calls to external APIs
suite.Iterate()
suite.Iterate()
}
usernamesToUuids = createUsernameToUuidsMock(assert, []string{"maksimkurb"}, nil, &mojang.TooManyRequestsError{})
func (suite *QueueTestSuite) TestHandle429ResponseWhenExchangingUsernamesToUuids() {
suite.MojangApi.On("UsernameToUuids", []string{"maksimkurb"}).Once().Return(nil, &mojang.TooManyRequestsError{})
queue := &JobsQueue{Storage: &NilStorage{}}
result := queue.GetTexturesForUsername("maksimkurb")
assert.Nil(result)
})
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
t.Run("handle 429 error when requesting user's textures", func(t *testing.T) {
assert := testify.New(t)
suite.Iterate()
usernamesToUuids = createUsernameToUuidsMock(
assert,
[]string{"maksimkurb"},
[]*mojang.ProfileInfo{
suite.Assert().Nil(<-resultChan)
}
func (suite *QueueTestSuite) TestHandle429ResponseWhenRequestingUsersTextures() {
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.TooManyRequestsError{},
)
uuidToTextures = createUuidToTextures([]*createUuidToTexturesResult{
createTexturesResult("0d252b7218b648bfb86c2ae476954d32", &mojang.TooManyRequestsError{}),
})
queue := &JobsQueue{Storage: &NilStorage{}}
result := queue.GetTexturesForUsername("maksimkurb")
assert.Nil(result)
})
resultChan := suite.Queue.GetTexturesForUsername("maksimkurb")
suite.Iterate()
suite.Assert().Nil(<-resultChan)
}
func createUsernameToUuidsMock(
assert *testify.Assertions,
expectedUsernames []string,
result []*mojang.ProfileInfo,
err error,
) func(usernames []string) ([]*mojang.ProfileInfo, error) {
return func(usernames []string) ([]*mojang.ProfileInfo, error) {
assert.ElementsMatch(expectedUsernames, usernames)
return result, err
}
}
type createUuidToTexturesResult struct {
uuid string
result *mojang.SignedTexturesResponse
err error
}
func createTexturesResult(uuid string, result interface{}) *createUuidToTexturesResult {
output := &createUuidToTexturesResult{uuid: uuid}
if username, ok := result.(string); ok {
output.result = &mojang.SignedTexturesResponse{Id: uuid, Name: username}
} else if err, ok := result.(error); ok {
output.err = err
} else {
log.Fatal("invalid result type passed")
}
return output
}
func createUuidToTextures(
results []*createUuidToTexturesResult,
) func(uuid string, signed bool) (*mojang.SignedTexturesResponse, error) {
return func(uuid string, signed bool) (*mojang.SignedTexturesResponse, error) {
for _, result := range results {
if result.uuid == uuid {
return result.result, result.err
}
}
return nil, errors.New("cannot find corresponding result")
}
func TestJobsQueueSuite(t *testing.T) {
suite.Run(t, new(QueueTestSuite))
}
// https://stackoverflow.com/a/50581165
func randStr(len int) string {
buff := make([]byte, len)
rand.Read(buff)
_, _ = rand.Read(buff)
str := base64.StdEncoding.EncodeToString(buff)
// Base 64 can be longer than len