From 0135904f7d3e1c0e763adaefe267c736616e3d26 Mon Sep 17 00:00:00 2001
From: Christopher Speller <crspeller@gmail.com>
Date: Wed, 16 Nov 2016 19:28:52 -0500
Subject: Upgrading server dependancies (#4566)

---
 vendor/gopkg.in/fsnotify.v1/inotify_test.go | 128 ++++++++++++++++------------
 1 file changed, 72 insertions(+), 56 deletions(-)

(limited to 'vendor/gopkg.in/fsnotify.v1/inotify_test.go')

diff --git a/vendor/gopkg.in/fsnotify.v1/inotify_test.go b/vendor/gopkg.in/fsnotify.v1/inotify_test.go
index 2527cad1f..a4bb202d1 100644
--- a/vendor/gopkg.in/fsnotify.v1/inotify_test.go
+++ b/vendor/gopkg.in/fsnotify.v1/inotify_test.go
@@ -10,10 +10,9 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
-
-	"golang.org/x/sys/unix"
 )
 
 func TestInotifyCloseRightAway(t *testing.T) {
@@ -154,10 +153,14 @@ func TestInotifyCloseCreate(t *testing.T) {
 	}
 }
 
+// This test verifies the watcher can keep up with file creations/deletions
+// when under load.
 func TestInotifyStress(t *testing.T) {
+	maxNumToCreate := 1000
+
 	testDir := tempMkdir(t)
 	defer os.RemoveAll(testDir)
-	testFile := filepath.Join(testDir, "testfile")
+	testFilePrefix := filepath.Join(testDir, "testfile")
 
 	w, err := NewWatcher()
 	if err != nil {
@@ -165,84 +168,85 @@ func TestInotifyStress(t *testing.T) {
 	}
 	defer w.Close()
 
-	killchan := make(chan struct{})
-	defer close(killchan)
-
 	err = w.Add(testDir)
 	if err != nil {
 		t.Fatalf("Failed to add testDir: %v", err)
 	}
 
-	proc, err := os.FindProcess(os.Getpid())
-	if err != nil {
-		t.Fatalf("Error finding process: %v", err)
-	}
+	doneChan := make(chan struct{})
+	// The buffer ensures that the file generation goroutine is never blocked.
+	errChan := make(chan error, 2*maxNumToCreate)
 
 	go func() {
-		for {
-			select {
-			case <-time.After(5 * time.Millisecond):
-				err := proc.Signal(unix.SIGUSR1)
-				if err != nil {
-					t.Fatalf("Signal failed: %v", err)
-				}
-			case <-killchan:
-				return
+		for i := 0; i < maxNumToCreate; i++ {
+			testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
+
+			handle, err := os.Create(testFile)
+			if err != nil {
+				errChan <- fmt.Errorf("Create failed: %v", err)
+				continue
 			}
-		}
-	}()
 
-	go func() {
-		for {
-			select {
-			case <-time.After(11 * time.Millisecond):
-				err := w.poller.wake()
-				if err != nil {
-					t.Fatalf("Wake failed: %v", err)
-				}
-			case <-killchan:
-				return
+			err = handle.Close()
+			if err != nil {
+				errChan <- fmt.Errorf("Close failed: %v", err)
+				continue
 			}
 		}
-	}()
 
-	go func() {
-		for {
-			select {
-			case <-killchan:
-				return
-			default:
-				handle, err := os.Create(testFile)
-				if err != nil {
-					t.Fatalf("Create failed: %v", err)
-				}
-				handle.Close()
-				time.Sleep(time.Millisecond)
-				err = os.Remove(testFile)
-				if err != nil {
-					t.Fatalf("Remove failed: %v", err)
-				}
+		// If we delete a newly created file too quickly, inotify will skip the
+		// create event and only send the delete event.
+		time.Sleep(100 * time.Millisecond)
+
+		for i := 0; i < maxNumToCreate; i++ {
+			testFile := fmt.Sprintf("%s%d", testFilePrefix, i)
+			err = os.Remove(testFile)
+			if err != nil {
+				errChan <- fmt.Errorf("Remove failed: %v", err)
 			}
 		}
+
+		close(doneChan)
 	}()
 
 	creates := 0
 	removes := 0
-	after := time.After(5 * time.Second)
-	for {
+
+	finished := false
+	after := time.After(10 * time.Second)
+	for !finished {
 		select {
 		case <-after:
-			if creates-removes > 1 || creates-removes < -1 {
-				t.Fatalf("Creates and removes should not be off by more than one: %d creates, %d removes", creates, removes)
+			t.Fatalf("Not done")
+		case <-doneChan:
+			finished = true
+		case err := <-errChan:
+			t.Fatalf("Got an error from file creator goroutine: %v", err)
+		case err := <-w.Errors:
+			t.Fatalf("Got an error from watcher: %v", err)
+		case evt := <-w.Events:
+			if !strings.HasPrefix(evt.Name, testFilePrefix) {
+				t.Fatalf("Got an event for an unknown file: %s", evt.Name)
+			}
+			if evt.Op == Create {
+				creates++
 			}
-			if creates < 50 {
-				t.Fatalf("Expected at least 50 creates, got %d", creates)
+			if evt.Op == Remove {
+				removes++
 			}
-			return
+		}
+	}
+
+	// Drain remaining events from channels
+	count := 0
+	for count < 10 {
+		select {
+		case err := <-errChan:
+			t.Fatalf("Got an error from file creator goroutine: %v", err)
 		case err := <-w.Errors:
 			t.Fatalf("Got an error from watcher: %v", err)
 		case evt := <-w.Events:
-			if evt.Name != testFile {
+			if !strings.HasPrefix(evt.Name, testFilePrefix) {
 				t.Fatalf("Got an event for an unknown file: %s", evt.Name)
 			}
 			if evt.Op == Create {
@@ -251,8 +255,20 @@ func TestInotifyStress(t *testing.T) {
 			if evt.Op == Remove {
 				removes++
 			}
+			count = 0
+		default:
+			count++
+			// Give the watcher chances to fill the channels.
+			time.Sleep(time.Millisecond)
 		}
 	}
+
+	if creates-removes > 1 || creates-removes < -1 {
+		t.Fatalf("Creates and removes should not be off by more than one: %d creates, %d removes", creates, removes)
+	}
+	if creates < 50 {
+		t.Fatalf("Expected at least 50 creates, got %d", creates)
+	}
 }
 
 func TestInotifyRemoveTwice(t *testing.T) {
-- 
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