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// Copyright 2015 Google Inc. All Rights Reserved.
// This file is available under the Apache license.
package vm
import (
"strings"
"testing"
"github.com/google/mtail/metrics"
"github.com/google/mtail/watcher"
"github.com/spf13/afero"
"github.com/kylelemons/godebug/pretty"
)
func TestNewLoader(t *testing.T) {
w := watcher.NewFakeWatcher()
store := metrics.NewStore()
inLines := make(chan string)
fs := afero.NewMemMapFs()
o := LoaderOptions{store, inLines, w, fs, false, false, true}
l, err := NewLoader(o)
if err != nil {
t.Fatalf("couldn't create loader: %s", err)
}
done := make(chan struct{})
outLines := make(chan string)
handle := &vmHandle{outLines, done}
l.handleMu.Lock()
l.handles["test"] = handle
l.handleMu.Unlock()
go func() {
for _ = range outLines {
}
close(done)
}()
close(inLines)
<-outLines
}
func TestCompileAndRun(t *testing.T) {
var testProgram = "/$/ {}\n"
store := metrics.NewStore()
lines := make(chan string)
w := watcher.NewFakeWatcher()
fs := afero.NewMemMapFs()
o := LoaderOptions{store, lines, w, fs, false, false, true}
l, err := NewLoader(o)
if err != nil {
t.Fatalf("couldn't create loader: %s", err)
}
if err := l.CompileAndRun("Test", strings.NewReader(testProgram)); err != nil {
t.Errorf("CompileAndRun returned error: %s", err)
}
l.handleMu.Lock()
if len(l.handles) < 1 {
t.Errorf("no vm handles: %v", l.handles)
}
l.handleMu.Unlock()
l.handleMu.Lock()
c := l.handles["Test"].done
if c == nil {
t.Errorf("No done channel in handles: %v", l.handles)
}
l.handleMu.Unlock()
close(lines)
<-c
{
l.handleMu.Lock()
defer l.handleMu.Unlock()
if len(l.handles) != 0 {
t.Errorf("some vm handles: %v", l.handles)
}
}
}
var testProcessEvents = []struct {
name string
events []watcher.Event
expectedPrograms []string
}{
{"load",
[]watcher.Event{
watcher.CreateEvent{Pathname: "foo.mtail"},
watcher.UpdateEvent{Pathname: "foo.mtail"}},
[]string{"foo.mtail"}},
{"unload",
[]watcher.Event{
watcher.CreateEvent{Pathname: "foo.mtail"},
watcher.UpdateEvent{Pathname: "foo.mtail"},
watcher.DeleteEvent{Pathname: "foo.mtail"}},
[]string{}},
{"reload",
[]watcher.Event{
watcher.CreateEvent{Pathname: "foo.mtail"},
watcher.UpdateEvent{Pathname: "foo.mtail"},
watcher.UpdateEvent{Pathname: "foo.mtail"}},
[]string{"foo.mtail"}},
{"bad extension",
[]watcher.Event{
watcher.CreateEvent{Pathname: "foo.mtail.dpkg-dist"},
watcher.UpdateEvent{Pathname: "foo.mtail.dpkg-dist"}},
[]string{}},
{"not exist",
[]watcher.Event{
watcher.CreateEvent{Pathname: "notexist.mtail"},
watcher.UpdateEvent{Pathname: "notexist.mtail"}},
[]string{}},
}
var testProgram = "/$/ {}\n"
func TestProcessEvents(t *testing.T) {
for _, tt := range testProcessEvents {
w := watcher.NewFakeWatcher()
w.Add(".")
store := metrics.NewStore()
lines := make(chan string)
fs := afero.NewMemMapFs()
o := LoaderOptions{store, lines, w, fs, false, false, true}
l, err := NewLoader(o)
if err != nil {
t.Fatalf("couldn't create loader: %s", err)
}
for i := range tt.events {
e := tt.events[i]
switch e := e.(type) {
case watcher.CreateEvent:
if e.Pathname != "notexist.mtail" {
_, err := fs.Create(e.Pathname)
if err != nil {
t.Fatalf("Create failed for %s: %s", e.Pathname, err)
}
}
w.InjectCreate(e.Pathname)
case watcher.DeleteEvent:
err := fs.Remove(e.Pathname)
if err != nil {
t.Fatalf("Remove failed for %s: %s", e.Pathname, err)
}
w.InjectDelete(e.Pathname)
case watcher.UpdateEvent:
if e.Pathname != "notexist.mtail" {
f, err := fs.Create(e.Pathname)
if err != nil {
t.Fatalf("Couldn't open file %s for test: %s", e.Pathname, err)
}
_, err = f.WriteString(testProgram)
if err != nil {
t.Fatalf("Couldn't write file contents: %s", err)
}
if err = f.Close(); err != nil {
t.Fatalf("Close failed: %s", err)
}
}
w.InjectUpdate(e.Pathname)
}
}
w.Close()
<-l.watcherDone
l.handleMu.RLock()
var programs []string
for program := range l.handles {
programs = append(programs, program)
}
l.handleMu.RUnlock()
l.handleMu.RLock()
if diff := pretty.Compare(tt.expectedPrograms, programs); len(diff) > 0 {
t.Errorf("%q: loaded programs don't match.\nl.handles: %+#v\n%s", tt.name, l.handles, diff)
}
l.handleMu.RUnlock()
close(lines)
}
}
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