// testUnnamed tests that two plugins built with .go files passed on
// the command line do not have overlapping symbols. That is,
// unnamed1.so/FuncInt and unnamed2.so/FuncInt should be distinct functions.
func testUnnamed() {
p, err := plugin.Open("unnamed1.so")
if err != nil {
log.Fatalf(`plugin.Open("unnamed1.so"): %v`, err)
}
fn, err := p.Lookup("FuncInt")
if err != nil {
log.Fatalf(`unnamed1.so: Lookup("FuncInt") failed: %v`, err)
}
if got, want := fn.(func() int)(), 1; got != want {
log.Fatalf("unnamed1.so: FuncInt()=%d, want %d", got, want)
}
p, err = plugin.Open("unnamed2.so")
if err != nil {
log.Fatalf(`plugin.Open("unnamed2.so"): %v`, err)
}
fn, err = p.Lookup("FuncInt")
if err != nil {
log.Fatalf(`unnamed2.so: Lookup("FuncInt") failed: %v`, err)
}
if got, want := fn.(func() int)(), 2; got != want {
log.Fatalf("unnamed2.so: FuncInt()=%d, want %d", got, want)
}
}
func loadMyApp() {
timer := time.NewTicker(time.Second)
for {
<-timer.C
glog.Info("Checking time ", time.Now().Unix())
fname := fmt.Sprintf("%d.so", time.Now().Unix())
if _, err := os.Stat(fname); os.IsNotExist(err) {
continue
}
p, err := plugin.Open(fname)
if err != nil {
log.Println(err)
continue
}
glog.Info("Plugin loaded: ", fname)
f, err := p.Lookup("MyAppHandler")
if err != nil {
log.Println(err)
continue
}
glog.Info("Func loaded")
myApp.app = p
h := f.(func(http.ResponseWriter, *http.Request))
myApp.Lock()
myApp.handler = &h
myApp.Unlock()
}
}
func main() {
if got, want := common.X, 3*5; got != want {
log.Fatalf("before plugin load common.X=%d, want %d", got, want)
}
p, err := plugin.Open("plugin1.so")
if err != nil {
log.Fatalf("plugin.Open failed: %v", err)
}
const wantX = 3 * 5 * 7
if got := common.X; got != wantX {
log.Fatalf("after plugin load common.X=%d, want %d", got, wantX)
}
seven, err := p.Lookup("Seven")
if err != nil {
log.Fatalf(`Lookup("Seven") failed: %v`, err)
}
if got, want := *seven.(*int), 7; got != want {
log.Fatalf("via lookup plugin1.Seven=%d, want %d", got, want)
}
readFunc, err := p.Lookup("ReadCommonX")
if err != nil {
log.Fatalf(`Lookup("ReadCommonX") failed: %v`, err)
}
if got := readFunc.(func() int)(); got != wantX {
log.Fatalf("via lookup plugin1.ReadCommonX()=%d, want %d", got, wantX)
}
fmt.Println("PASS")
}
//
// Call the `HANDLES` method of the specified plugin.
//
func plugin_handles(path string) string {
p, err := plugin.Open(path)
if err != nil {
panic(err)
}
f, err := p.Lookup("HANDLES")
if err != nil {
panic(err)
}
x := f.(func() string)()
return (x)
}
func main() {
p, err := plugin.Open("plugin.so")
if err != nil {
log.Panic(err)
}
f, err := p.Lookup("Say")
if err != nil {
log.Panic(err)
}
f.(func())() // prints "Hello or Bye based on which plugin is available in plugin.so"
}
//
// Given the path to a plugin, and a string argument, invoke the plugin
// method.
//
func run_plugin(path string, arg string) {
p, err := plugin.Open(path)
if err != nil {
panic(err)
}
v, err := p.Lookup("INPUT")
if err != nil {
panic(err)
}
f, err := p.Lookup("RUN_TEST")
if err != nil {
panic(err)
}
*v.(*string) = arg
f.(func())() // call the plugin
}
func main() {
if got, want := common.X, 3*5; got != want {
log.Fatalf("before plugin load common.X=%d, want %d", got, want)
}
p, err := plugin.Open("plugin1.so")
if err != nil {
log.Fatalf("plugin.Open failed: %v", err)
}
const wantX = 3 * 5 * 7
if got := common.X; got != wantX {
log.Fatalf("after plugin load common.X=%d, want %d", got, wantX)
}
seven, err := p.Lookup("Seven")
if err != nil {
log.Fatalf(`Lookup("Seven") failed: %v`, err)
}
if got, want := *seven.(*int), 7; got != want {
log.Fatalf("plugin1.Seven=%d, want %d", got, want)
}
readFunc, err := p.Lookup("ReadCommonX")
if err != nil {
log.Fatalf(`plugin1.Lookup("ReadCommonX") failed: %v`, err)
}
if got := readFunc.(func() int)(); got != wantX {
log.Fatalf("plugin1.ReadCommonX()=%d, want %d", got, wantX)
}
// sub/plugin1.so is a different plugin with the same name as
// the already loaded plugin. It also depends on common. Test
// that we can load the different plugin, it is actually
// different, and that it sees the same common package.
subpPath, err := filepath.Abs("sub/plugin1.so")
if err != nil {
log.Fatalf("filepath.Abs(%q) failed: %v", subpPath, err)
}
subp, err := plugin.Open(subpPath)
if err != nil {
log.Fatalf("plugin.Open(%q) failed: %v", subpPath, err)
}
funcVar, err := subp.Lookup("FuncVar")
if err != nil {
log.Fatalf(`sub/plugin1.Lookup("FuncVar") failed: %v`, err)
}
called := false
*funcVar.(*func()) = func() {
called = true
}
readFunc, err = subp.Lookup("ReadCommonX")
if err != nil {
log.Fatalf(`sub/plugin1.Lookup("ReadCommonX") failed: %v`, err)
}
if got := readFunc.(func() int)(); got != wantX {
log.Fatalf("sub/plugin1.ReadCommonX()=%d, want %d", got, wantX)
}
if !called {
log.Fatal("calling ReadCommonX did not call FuncVar")
}
subf, err := subp.Lookup("F")
if err != nil {
log.Fatalf(`sub/plugin1.Lookup("F") failed: %v`, err)
}
if gotf := subf.(func() int)(); gotf != 17 {
log.Fatalf(`sub/plugin1.F()=%d, want 17`, gotf)
}
f, err := p.Lookup("F")
if err != nil {
log.Fatalf(`plugin1.Lookup("F") failed: %v`, err)
}
if gotf := f.(func() int)(); gotf != 3 {
log.Fatalf(`plugin1.F()=%d, want 17`, gotf)
}
// plugin2 has no exported symbols, only an init function.
if _, err := plugin.Open("plugin2.so"); err != nil {
log.Fatalf("plugin.Open failed: %v", err)
}
if got, want := common.X, 2; got != want {
log.Fatalf("after loading plugin2, common.X=%d, want %d", got, want)
}
_, err = plugin.Open("plugin-mismatch.so")
if err == nil {
log.Fatal(`plugin.Open("plugin-mismatch.so"): should have failed`)
}
if s := err.Error(); !strings.Contains(s, "different version") {
log.Fatalf(`plugin.Open("plugin-mismatch.so"): error does not mention "different version": %v`, s)
}
testUnnamed()
fmt.Println("PASS")
}