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main.go
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main.go
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//go:build js && wasm
package main
import (
"bytes"
"fmt"
"io"
"log"
"os"
"sync"
"syscall/js"
"time"
"github.com/hack-pad/safejs"
"github.com/magodo/go-wasmww"
"github.com/magodo/go-webworkers/types"
)
func main() {
os.Setenv("parent_foo", "parent_bar")
conn1 := &wasmww.WasmSharedWebWorkerConn{
Name: "hello",
Path: "hello.wasm",
}
fmt.Println("Case1: Basic, connect, set stdout/stderr, close conn/worker from worker")
mgmtConn, err := conn1.Start()
if err != nil {
log.Fatal(err)
}
var stdout, stderr bytes.Buffer
var wg sync.WaitGroup
wg.Add(1)
go func() {
io.Copy(&stdout, mgmtConn.Stdout())
wg.Done()
}()
wg.Add(1)
go func() {
io.Copy(&stderr, mgmtConn.Stderr())
wg.Done()
}()
wg.Add(1)
go func() {
handle(conn1.EventChannel())()
wg.Done()
}()
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("Hello Foo!")), nil); err != nil {
log.Fatal(err)
}
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("Hello Bar!")), nil); err != nil {
log.Fatal(err)
}
// Create a 2nd connection to the shared worker
conn2, err := mgmtConn.Connect()
if err != nil {
log.Fatal(err)
}
wg.Add(1)
go func() {
handle(conn2.EventChannel())()
wg.Done()
}()
// Close and wait for the 1st port closed when the 2nd connection is active, to avoid the worker to close itself.
// Since on the worker side, we will close it if there is no active connection.
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("ClosePort")), nil); err != nil {
log.Fatal(err)
}
conn1.Wait()
if err := conn2.PostMessage(safejs.Safe(js.ValueOf("Hi Foo!")), nil); err != nil {
log.Fatal(err)
}
if err := conn2.PostMessage(safejs.Safe(js.ValueOf("Hi Bar!")), nil); err != nil {
log.Fatal(err)
}
// Connect conn1 back (to test a closed connection can connect again)
conn1, err = mgmtConn.Connect()
if err != nil {
log.Fatal(err)
}
wg.Add(1)
go func() {
handle(conn1.EventChannel())()
wg.Done()
}()
// Close and wait for the 2nd port closed, after the conn1 is connected again
if err := conn2.PostMessage(safejs.Safe(js.ValueOf("ClosePort")), nil); err != nil {
log.Fatal(err)
}
conn2.Wait()
if err := mgmtConn.SetWriteToConsole(); err != nil {
log.Fatal(err)
}
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("Hey Console!")), nil); err != nil {
log.Fatal(err)
}
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("WriteToNull")), nil); err != nil {
log.Fatal(err)
}
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("Hey Secret!")), nil); err != nil {
log.Fatal(err)
}
if err := mgmtConn.SetWriteToController(); err != nil {
log.Fatal(err)
}
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("Hey Controller!")), nil); err != nil {
log.Fatal(err)
}
// Close and wait for the 1st port closed again, this will close the worker as it is the last connection
if err := conn1.PostMessage(safejs.Safe(js.ValueOf("ClosePort")), nil); err != nil {
log.Fatal(err)
}
conn1.Wait()
// The close of the worker will close the console connection
mgmtConn.Wait()
// Wait until the console output streams are all copied and event handler done
wg.Wait()
printWorker(stdout, stderr)
// Re-spawn
fmt.Println("Case2: Start a closed conn, close conn/worker from outside, connect after close")
conn1.Env = []string{
"foo=bar",
}
conn1.Args = []string{"wasm", "arg"}
mgmtConn, err = conn1.Start()
if err != nil {
log.Fatal(err)
}
stdout.Reset()
stderr.Reset()
wg = sync.WaitGroup{}
wg.Add(1)
go func() {
io.Copy(&stdout, mgmtConn.Stdout())
wg.Done()
}()
wg.Add(1)
go func() {
io.Copy(&stderr, mgmtConn.Stderr())
wg.Done()
}()
conn2, err = mgmtConn.Connect()
if err != nil {
log.Fatal(err)
}
conn3, err := mgmtConn.Connect()
if err != nil {
log.Fatal(err)
}
// Close the conn3 from within the worker
if err := conn3.PostMessage(safejs.Safe(js.ValueOf("ClosePort")), nil); err != nil {
log.Fatal(err)
}
conn3.Wait()
// Close the conn2 from the outside
if err := conn2.Close(); err != nil {
log.Fatal(err)
}
conn2.Wait()
// Try to connect after closing
if err := conn2.Connect(); err != nil {
log.Fatal(err)
}
if err := conn2.PostMessage(safejs.Safe(js.ValueOf("connected after close")), nil); err != nil {
log.Fatal(err)
}
// Give some time to the worker to finish printing...
time.Sleep(time.Millisecond * 100)
// Terminate the worker
if err := mgmtConn.Close(); err != nil {
log.Fatal(err)
}
conn1.Wait()
mgmtConn.Wait()
wg.Wait()
printWorker(stdout, stderr)
// Re-spawn again
fmt.Println("Case3: Close the worker from the worker with other conns active, which should gracefully notify these conns")
mgmtConn, err = conn1.Start()
if err != nil {
log.Fatal(err)
}
stdout.Reset()
stderr.Reset()
wg = sync.WaitGroup{}
wg.Add(1)
go func() {
io.Copy(&stdout, mgmtConn.Stdout())
wg.Done()
}()
wg.Add(1)
go func() {
io.Copy(&stderr, mgmtConn.Stderr())
wg.Done()
}()
// Connect via mgmt connection
conn2, err = mgmtConn.Connect()
if err != nil {
log.Fatal(err)
}
// Connect via newly constructing a conn
conn3 = &wasmww.WasmSharedWebWorkerConn{
Name: conn1.Name,
URL: conn1.URL,
}
if err := conn3.Connect(); err != nil {
log.Fatal(err)
}
// Close the worker from a random connection with other connections active
if err := conn2.PostMessage(safejs.Safe(js.ValueOf("CloseWorker")), nil); err != nil {
log.Fatal(err)
}
conn1.Wait()
conn2.Wait()
conn3.Wait()
mgmtConn.Wait()
wg.Wait()
printWorker(stdout, stderr)
fmt.Println("Control: End")
}
func handle(ch <-chan types.MessageEventMessage) func() {
return func() {
for evt := range ch {
data, err := evt.Data()
if err != nil {
log.Fatal(err)
}
str, err := data.String()
if err != nil {
log.Fatal(err)
}
fmt.Printf("Control: Received %q\n", str)
}
fmt.Printf("Control: Quit event handler\n")
}
}
func printWorker(stdout, stderr bytes.Buffer) {
fmt.Printf(`Worker Stdout
---
%s
---
`, stdout.String())
fmt.Printf(`Worker Stderr
---
%s
---
`, stderr.String())
}