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Provide graceful shutdown of file watcher in tests

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This test failure from #92 inspired this change:
https://travis-ci.org/bitly/google_auth_proxy/jobs/62425336

2015/05/13 16:27:33 using authenticated emails file /tmp/test_auth_emails_952353477
2015/05/13 16:27:33 watching /tmp/test_auth_emails_952353477 for updates
2015/05/13 16:27:33 validating: is xyzzy@example.com valid? true
2015/05/13 16:27:33 watching interrupted on event: "/tmp/test_auth_emails_952353477": CHMOD
2015/05/13 16:27:33 watching resumed for /tmp/test_auth_emails_952353477
2015/05/13 16:27:33 reloading after event: "/tmp/test_auth_emails_952353477": CHMOD
2015/05/13 16:27:33 watching interrupted on event: "/tmp/test_auth_emails_952353477": REMOVE
2015/05/13 16:27:33 validating: is xyzzy@example.com valid? false
2015/05/13 16:27:33 watching resumed for /tmp/test_auth_emails_952353477
2015/05/13 16:27:33 reloading after event: "/tmp/test_auth_emails_952353477": REMOVE
2015/05/13 16:27:33 failed opening authenticated-emails-file="/tmp/test_auth_emails_952353477", open /tmp/test_auth_emails_952353477: no such file or directory

I believe that what happened was that the call to reload the file after the
second "reloading after event" lost the race when the test shut down and the
file was removed. This change introduces a `done` channel that ensures
outstanding actions complete and the watcher exits before the test removes the
file.
This commit is contained in:
Mike Bland 2015-05-13 17:30:19 -04:00
parent 254b26d4a0
commit 6a0f119fc2
5 changed files with 27 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
validator.go
View File

@ -15,13 +15,13 @@ type UserMap struct {
m unsafe.Pointer
}
func NewUserMap(usersFile string, onUpdate func()) *UserMap {
func NewUserMap(usersFile string, done <-chan bool, onUpdate func()) *UserMap {
um := &UserMap{usersFile: usersFile}
m := make(map[string]bool)
atomic.StorePointer(&um.m, unsafe.Pointer(&m))
if usersFile != "" {
log.Printf("using authenticated emails file %s", usersFile)
started := WatchForUpdates(usersFile, func() {
started := WatchForUpdates(usersFile, done, func() {
um.LoadAuthenticatedEmailsFile()
onUpdate()
})
@ -62,8 +62,8 @@ func (um *UserMap) LoadAuthenticatedEmailsFile() {
}
func newValidatorImpl(domains []string, usersFile string,
onUpdate func()) func(string) bool {
validUsers := NewUserMap(usersFile, onUpdate)
done <-chan bool, onUpdate func()) func(string) bool {
validUsers := NewUserMap(usersFile, done, onUpdate)
for i, domain := range domains {
domains[i] = fmt.Sprintf("@%s", strings.ToLower(domain))
@ -85,5 +85,5 @@ func newValidatorImpl(domains []string, usersFile string,
}
func NewValidator(domains []string, usersFile string) func(string) bool {
return newValidatorImpl(domains, usersFile, func() {})
return newValidatorImpl(domains, usersFile, nil, func() {})
}

19
validator_test.go
View File

@ -9,6 +9,7 @@ import (
type ValidatorTest struct {
auth_email_file *os.File
done chan bool
}
func NewValidatorTest(t *testing.T) *ValidatorTest {
@ -18,13 +19,21 @@ func NewValidatorTest(t *testing.T) *ValidatorTest {
if err != nil {
t.Fatal("failed to create temp file: " + err.Error())
}
vt.done = make(chan bool)
return vt
}
func (vt *ValidatorTest) TearDown() {
vt.done <- true
os.Remove(vt.auth_email_file.Name())
}
func (vt *ValidatorTest) NewValidator(domains []string,
updated chan<- bool) func(string) bool {
return newValidatorImpl(domains, vt.auth_email_file.Name(),
vt.done, func() { updated <- true })
}
// This will close vt.auth_email_file.
func (vt *ValidatorTest) WriteEmails(t *testing.T, emails []string) {
defer vt.auth_email_file.Close()
@ -41,7 +50,7 @@ func TestValidatorEmpty(t *testing.T) {
vt.WriteEmails(t, []string(nil))
domains := []string(nil)
validator := NewValidator(domains, vt.auth_email_file.Name())
validator := vt.NewValidator(domains, nil)
if validator("foo.bar@example.com") {
t.Error("nothing should validate when the email and " +
@ -55,7 +64,7 @@ func TestValidatorSingleEmail(t *testing.T) {
vt.WriteEmails(t, []string{"foo.bar@example.com"})
domains := []string(nil)
validator := NewValidator(domains, vt.auth_email_file.Name())
validator := vt.NewValidator(domains, nil)
if !validator("foo.bar@example.com") {
t.Error("email should validate")
@ -72,7 +81,7 @@ func TestValidatorSingleDomain(t *testing.T) {
vt.WriteEmails(t, []string(nil))
domains := []string{"example.com"}
validator := NewValidator(domains, vt.auth_email_file.Name())
validator := vt.NewValidator(domains, nil)
if !validator("foo.bar@example.com") {
t.Error("email should validate")
@ -91,7 +100,7 @@ func TestValidatorMultipleEmailsMultipleDomains(t *testing.T) {
"plugh@example.com",
})
domains := []string{"example0.com", "example1.com"}
validator := NewValidator(domains, vt.auth_email_file.Name())
validator := vt.NewValidator(domains, nil)
if !validator("foo.bar@example0.com") {
t.Error("email from first domain should validate")
@ -117,7 +126,7 @@ func TestValidatorComparisonsAreCaseInsensitive(t *testing.T) {
vt.WriteEmails(t, []string{"Foo.Bar@Example.Com"})
domains := []string{"Frobozz.Com"}
validator := NewValidator(domains, vt.auth_email_file.Name())
validator := vt.NewValidator(domains, nil)
if !validator("foo.bar@example.com") {
t.Error("loaded email addresses are not lower-cased")

3
validator_watcher_copy_test.go
View File

@ -34,8 +34,7 @@ func TestValidatorOverwriteEmailListViaCopyingOver(t *testing.T) {
vt.WriteEmails(t, []string{"xyzzy@example.com"})
domains := []string(nil)
updated := make(chan bool)
validator := newValidatorImpl(domains, vt.auth_email_file.Name(),
func() { updated <- true })
validator := vt.NewValidator(domains, updated)
if !validator("xyzzy@example.com") {
t.Error("email in list should validate")

6
validator_watcher_test.go
View File

@ -51,8 +51,7 @@ func TestValidatorOverwriteEmailListDirectly(t *testing.T) {
})
domains := []string(nil)
updated := make(chan bool)
validator := newValidatorImpl(domains, vt.auth_email_file.Name(),
func() { updated <- true })
validator := vt.NewValidator(domains, updated)
if !validator("xyzzy@example.com") {
t.Error("first email in list should validate")
@ -89,8 +88,7 @@ func TestValidatorOverwriteEmailListViaRenameAndReplace(t *testing.T) {
vt.WriteEmails(t, []string{"xyzzy@example.com"})
domains := []string(nil)
updated := make(chan bool)
validator := newValidatorImpl(domains, vt.auth_email_file.Name(),
func() { updated <- true })
validator := vt.NewValidator(domains, updated)
if !validator("xyzzy@example.com") {
t.Error("email in list should validate")

6
watcher.go
View File

@ -30,7 +30,7 @@ func WaitForReplacement(event fsnotify.Event, watcher *fsnotify.Watcher) {
}
}
func WatchForUpdates(filename string, action func()) bool {
func WatchForUpdates(filename string, done <-chan bool, action func()) bool {
filename = filepath.Clean(filename)
watcher, err := fsnotify.NewWatcher()
if err != nil {
@ -40,6 +40,10 @@ func WatchForUpdates(filename string, action func()) bool {
defer watcher.Close()
for {
select {
case _ = <-done:
log.Printf("Shutting down watcher for: %s",
filename)
return
case event := <-watcher.Events:
// On Arch Linux, it appears Chmod events precede Remove events,
// which causes a race between action() and the coming Remove event.