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| //go:build js && wasm | |
| // +build js,wasm | |
| package webrtc | |
| import ( | |
| "fmt" | |
| "syscall/js" | |
| ) | |
| // awaitPromise accepts a js.Value representing a Promise. If the promise | |
| // resolves, it returns (result, nil). If the promise rejects, it returns | |
| // (js.Undefined, error). awaitPromise has a synchronous-like API but does not | |
| // block the JavaScript event loop. | |
| func awaitPromise(promise js.Value) (js.Value, error) { | |
| resultsChan := make(chan js.Value) | |
| errChan := make(chan js.Error) | |
| thenFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} { | |
| go func() { | |
| resultsChan <- args[0] | |
| }() | |
| return js.Undefined() | |
| }) | |
| defer thenFunc.Release() | |
| catchFunc := js.FuncOf(func(this js.Value, args []js.Value) interface{} { | |
| go func() { | |
| errChan <- js.Error{args[0]} | |
| }() | |
| return js.Undefined() | |
| }) | |
| defer catchFunc.Release() | |
| promise.Call("then", thenFunc).Call("catch", catchFunc) | |
| select { | |
| case result := <-resultsChan: | |
| return result, nil | |
| case err := <-errChan: | |
| return js.Undefined(), err | |
| } | |
| } | |
| func valueToUint16Pointer(val js.Value) *uint16 { | |
| if val.IsNull() || val.IsUndefined() { | |
| return nil | |
| } | |
| convertedVal := uint16(val.Int()) | |
| return &convertedVal | |
| } | |
| func valueToStringPointer(val js.Value) *string { | |
| if val.IsNull() || val.IsUndefined() { | |
| return nil | |
| } | |
| stringVal := val.String() | |
| return &stringVal | |
| } | |
| func stringToValueOrUndefined(val string) js.Value { | |
| if val == "" { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(val) | |
| } | |
| func uint8ToValueOrUndefined(val uint8) js.Value { | |
| if val == 0 { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(val) | |
| } | |
| func interfaceToValueOrUndefined(val interface{}) js.Value { | |
| if val == nil { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(val) | |
| } | |
| func valueToStringOrZero(val js.Value) string { | |
| if val.IsUndefined() || val.IsNull() { | |
| return "" | |
| } | |
| return val.String() | |
| } | |
| func valueToUint8OrZero(val js.Value) uint8 { | |
| if val.IsUndefined() || val.IsNull() { | |
| return 0 | |
| } | |
| return uint8(val.Int()) | |
| } | |
| func valueToUint16OrZero(val js.Value) uint16 { | |
| if val.IsNull() || val.IsUndefined() { | |
| return 0 | |
| } | |
| return uint16(val.Int()) | |
| } | |
| func valueToUint32OrZero(val js.Value) uint32 { | |
| if val.IsNull() || val.IsUndefined() { | |
| return 0 | |
| } | |
| return uint32(val.Int()) | |
| } | |
| func valueToStrings(val js.Value) []string { | |
| result := make([]string, val.Length()) | |
| for i := 0; i < val.Length(); i++ { | |
| result[i] = val.Index(i).String() | |
| } | |
| return result | |
| } | |
| func stringPointerToValue(val *string) js.Value { | |
| if val == nil { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(*val) | |
| } | |
| func uint16PointerToValue(val *uint16) js.Value { | |
| if val == nil { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(*val) | |
| } | |
| func boolPointerToValue(val *bool) js.Value { | |
| if val == nil { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(*val) | |
| } | |
| func stringsToValue(strings []string) js.Value { | |
| val := make([]interface{}, len(strings)) | |
| for i, s := range strings { | |
| val[i] = s | |
| } | |
| return js.ValueOf(val) | |
| } | |
| func stringEnumToValueOrUndefined(s string) js.Value { | |
| if s == "unknown" { | |
| return js.Undefined() | |
| } | |
| return js.ValueOf(s) | |
| } | |
| // Converts the return value of recover() to an error. | |
| func recoveryToError(e interface{}) error { | |
| switch e := e.(type) { | |
| case error: | |
| return e | |
| default: | |
| return fmt.Errorf("recovered with non-error value: (%T) %s", e, e) | |
| } | |
| } | |
| func uint8ArrayValueToBytes(val js.Value) []byte { | |
| result := make([]byte, val.Length()) | |
| js.CopyBytesToGo(result, val) | |
| return result | |
| } |