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reloader_test.go
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package reloader
import (
"fmt"
"io/ioutil"
"os"
"reflect"
"testing"
"time"
)
func noop([]byte) error {
return nil
}
func testErrCb(t *testing.T) func(error) {
return func(e error) {
t.Error(e)
}
}
func testFatalCb(t *testing.T) func(error) {
return func(e error) {
t.Fatal(e)
}
}
func TestNoStat(t *testing.T) {
filename := os.TempDir() + "/doesntexist.123456789"
_, err := New(filename, noop, testErrCb(t))
if err == nil {
t.Fatalf("Expected New to return error when the file doesn't exist.")
}
}
func TestNoRead(t *testing.T) {
f, _ := ioutil.TempFile("", "test-no-read.txt")
defer os.Remove(f.Name())
oldReadFile := readFile
readFile = func(string) ([]byte, error) {
return nil, fmt.Errorf("read failed")
}
_, err := New(f.Name(), noop, testErrCb(t))
if err == nil {
t.Fatalf("Expected New to return error when permission denied.")
readFile = oldReadFile
}
readFile = oldReadFile
}
func TestFirstError(t *testing.T) {
f, _ := ioutil.TempFile("", "test-first-error.txt")
defer os.Remove(f.Name())
_, err := New(f.Name(), func([]byte) error {
return fmt.Errorf("i die")
}, testErrCb(t))
if err == nil {
t.Fatalf("Expected New to return error when the callback returned error the first time.")
}
}
func TestFirstSuccess(t *testing.T) {
f, _ := ioutil.TempFile("", "test-first-success.txt")
defer os.Remove(f.Name())
r, err := New(f.Name(), func([]byte) error {
return nil
}, testErrCb(t))
if err != nil {
t.Errorf("Expected New to succeed, got %s", err)
}
r.Stop()
}
// Override makeTicker for testing.
// Returns a channel on which to send artificial ticks, and a function to
// restore the default makeTicker.
func makeFakeMakeTicker() (chan<- time.Time, func()) {
origMakeTicker := makeTicker
fakeTickChan := make(chan time.Time)
makeTicker = func() (func(), <-chan time.Time) {
return func() {}, fakeTickChan
}
return fakeTickChan, func() {
makeTicker = origMakeTicker
}
}
func TestReload(t *testing.T) {
// Mock out makeTicker
fakeTick, restoreMakeTicker := makeFakeMakeTicker()
defer restoreMakeTicker()
f, _ := ioutil.TempFile("", "test-reload.txt")
filename := f.Name()
defer os.Remove(filename)
_, _ = f.Write([]byte("first body"))
_ = f.Close()
var bodies []string
reloads := make(chan []byte, 1)
r, err := New(filename, func(b []byte) error {
bodies = append(bodies, string(b))
reloads <- b
return nil
}, testFatalCb(t))
if err != nil {
t.Fatalf("Expected New to succeed, got %s", err)
}
defer r.Stop()
expected := []string{"first body"}
if !reflect.DeepEqual(bodies, expected) {
t.Errorf("Expected bodies = %#v, got %#v", expected, bodies)
}
fakeTick <- time.Now()
<-reloads
if !reflect.DeepEqual(bodies, expected) {
t.Errorf("Expected bodies = %#v, got %#v", expected, bodies)
}
// Write to the file, expect a reload. Sleep a few milliseconds first so the
// timestamps actually differ.
time.Sleep(1 * time.Second)
err = ioutil.WriteFile(filename, []byte("second body"), 0644)
if err != nil {
t.Fatal(err)
}
fakeTick <- time.Now()
<-reloads
expected = []string{"first body", "second body"}
if !reflect.DeepEqual(bodies, expected) {
t.Errorf("Expected bodies = %#v, got %#v", expected, bodies)
}
// Send twice on this blocking channel to make sure we go through at least on
// iteration of the reloader's loop.
fakeTick <- time.Now()
fakeTick <- time.Now()
if !reflect.DeepEqual(bodies, expected) {
t.Errorf("Expected bodies = %#v, got %#v", expected, bodies)
}
}
func TestReloadFailure(t *testing.T) {
// Mock out makeTicker
fakeTick, restoreMakeTicker := makeFakeMakeTicker()
f, _ := ioutil.TempFile("", "test-reload-failure.txt")
filename := f.Name()
defer func() {
restoreMakeTicker()
_ = os.Remove(filename)
}()
_, _ = f.Write([]byte("first body"))
_ = f.Close()
type res struct {
b []byte
err error
}
reloads := make(chan res, 1)
_, err := New(filename, func(b []byte) error {
reloads <- res{b, nil}
return nil
}, func(e error) {
reloads <- res{nil, e}
})
if err != nil {
t.Fatalf("Expected New to succeed.")
}
<-reloads
os.Remove(filename)
fakeTick <- time.Now()
select {
case r := <-reloads:
if r.err == nil {
t.Errorf("Expected error trying to read missing file.")
}
case <-time.After(5 * time.Second):
t.Errorf("timed out waiting for reload")
}
time.Sleep(1 * time.Second)
// Create a file with no permissions
oldReadFile := readFile
readFile = func(string) ([]byte, error) {
return nil, fmt.Errorf("permission denied")
}
fakeTick <- time.Now()
select {
case r := <-reloads:
if r.err == nil {
t.Errorf("Expected error trying to read file with no permissions.")
}
case <-time.After(5 * time.Second):
t.Fatalf("timed out waiting for reload")
}
readFile = oldReadFile
err = ioutil.WriteFile(filename, []byte("third body"), 0644)
if err != nil {
t.Fatal(err)
}
fakeTick <- time.Now()
select {
case r := <-reloads:
if r.err != nil {
t.Errorf("Unexpected error: %s", err)
}
if string(r.b) != "third body" {
t.Errorf("Expected 'third body' reading file after restoring it.")
}
return
case <-time.After(5 * time.Second):
t.Fatalf("timed out waiting for successful reload")
}
}