117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package ws
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import (
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"context"
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"crypto/tls"
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"fmt"
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"io"
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"net/http"
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"time"
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"git.mleku.dev/mleku/nostr/utils/units"
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"github.com/gorilla/websocket"
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"lol.mleku.dev/errorf"
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)
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// Connection represents a websocket connection to a Nostr relay.
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type Connection struct {
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conn *websocket.Conn
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}
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// NewConnection creates a new websocket connection to a Nostr relay.
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func NewConnection(
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ctx context.Context, url string, reqHeader http.Header,
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tlsConfig *tls.Config,
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) (c *Connection, err error) {
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var conn *websocket.Conn
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var resp *http.Response
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dialer := getConnectionOptions(reqHeader, tlsConfig)
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// Prepare headers with default User-Agent if not present
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headers := reqHeader
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if headers == nil {
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headers = make(http.Header)
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}
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if headers.Get("User-Agent") == "" {
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headers.Set("User-Agent", "github.com/nbd-wtf/go-nostr")
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}
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if conn, resp, err = dialer.DialContext(ctx, url, headers); err != nil {
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if resp != nil {
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resp.Body.Close()
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}
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return
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}
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conn.SetReadLimit(33 * units.Mb)
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return &Connection{
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conn: conn,
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}, nil
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}
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// WriteMessage writes arbitrary bytes to the websocket connection.
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func (c *Connection) WriteMessage(
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ctx context.Context, data []byte,
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) (err error) {
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deadline := time.Now().Add(10 * time.Second)
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if ctx != nil {
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if d, ok := ctx.Deadline(); ok {
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deadline = d
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}
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}
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c.conn.SetWriteDeadline(deadline)
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if err = c.conn.WriteMessage(websocket.TextMessage, data); err != nil {
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err = errorf.E("failed to write message: %w", err)
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return
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}
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return nil
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}
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// ReadMessage reads arbitrary bytes from the websocket connection into the provided buffer.
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func (c *Connection) ReadMessage(
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ctx context.Context, buf io.Writer,
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) (err error) {
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deadline := time.Now().Add(60 * time.Second)
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if ctx != nil {
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if d, ok := ctx.Deadline(); ok {
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deadline = d
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}
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}
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c.conn.SetReadDeadline(deadline)
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messageType, reader, err := c.conn.NextReader()
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if err != nil {
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err = fmt.Errorf("failed to get reader: %w", err)
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return
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}
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if messageType != websocket.TextMessage && messageType != websocket.BinaryMessage {
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err = fmt.Errorf("unexpected message type: %d", messageType)
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return
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}
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if _, err = io.Copy(buf, reader); err != nil {
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err = fmt.Errorf("failed to read message: %w", err)
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return
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}
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return
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}
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// Close closes the websocket connection.
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func (c *Connection) Close() error {
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c.conn.WriteControl(
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websocket.CloseMessage,
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websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""),
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time.Now().Add(time.Second),
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)
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return c.conn.Close()
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}
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// Ping sends a ping message to the websocket connection.
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func (c *Connection) Ping(ctx context.Context) error {
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deadline := time.Now().Add(800 * time.Millisecond)
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if ctx != nil {
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if d, ok := ctx.Deadline(); ok {
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deadline = d
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}
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}
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c.conn.SetWriteDeadline(deadline)
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return c.conn.WriteControl(websocket.PingMessage, []byte{}, deadline)
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}
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