support wasm (#163)

connection_js.go

@@ -0,0 +1,55 @@
+//go:build js
+
+package nostr
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net/http"
+
+	ws "github.com/coder/websocket"
+)
+
+type Connection struct {
+	conn *ws.Conn
+}
+
+func NewConnection(ctx context.Context, url string, requestHeader http.Header, tlsConfig *tls.Config) (*Connection, error) {
+	c, _, err := ws.Dial(ctx, url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Connection{
+		conn: c,
+	}, nil
+}
+
+func (c *Connection) WriteMessage(ctx context.Context, data []byte) error {
+	if err := c.conn.Write(ctx, ws.MessageBinary, data); err != nil {
+		return fmt.Errorf("failed to write message: %w", err)
+	}
+
+	return nil
+}
+
+func (c *Connection) ReadMessage(ctx context.Context, buf io.Writer) error {
+	_, reader, err := c.conn.Reader(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to get reader: %w", err)
+	}
+	if _, err := io.Copy(buf, reader); err != nil {
+		return fmt.Errorf("failed to read message: %w", err)
+	}
+	return nil
+}
+
+func (c *Connection) Close() error {
+	return c.conn.Close(ws.StatusNormalClosure, "")
+}
+
+func (c *Connection) Ping(ctx context.Context) error {
+	return c.conn.Ping(ctx)
+}