99 lines
2.3 KiB
Go
99 lines
2.3 KiB
Go
package ws
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/textproto"
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"time"
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ws "github.com/coder/websocket"
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)
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var defaultConnectionOptions = &ws.DialOptions{
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CompressionMode: ws.CompressionContextTakeover,
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HTTPHeader: http.Header{
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textproto.CanonicalMIMEHeaderKey("User-Agent"): {"github.com/nbd-wtf/go-nostr"},
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},
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}
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func getConnectionOptions(
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requestHeader http.Header, tlsConfig *tls.Config,
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) *ws.DialOptions {
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if requestHeader == nil && tlsConfig == nil {
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return defaultConnectionOptions
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}
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return &ws.DialOptions{
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HTTPHeader: requestHeader,
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CompressionMode: ws.CompressionContextTakeover,
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HTTPClient: &http.Client{
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Transport: &http.Transport{
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TLSClientConfig: tlsConfig,
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},
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},
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}
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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 *ws.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, requestHeader http.Header,
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tlsConfig *tls.Config,
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) (*Connection, error) {
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c, _, err := ws.Dial(
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ctx, url, getConnectionOptions(requestHeader, tlsConfig),
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)
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if err != nil {
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return nil, err
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}
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c.SetReadLimit(2 << 24) // 33MB
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return &Connection{
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conn: c,
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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(ctx context.Context, data []byte) error {
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if err := c.conn.Write(ctx, ws.MessageText, data); err != nil {
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return fmt.Errorf("failed to write message: %w", err)
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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(ctx context.Context, buf io.Writer) error {
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_, reader, err := c.conn.Reader(ctx)
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if err != nil {
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return fmt.Errorf("failed to get reader: %w", err)
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}
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if _, err := io.Copy(buf, reader); err != nil {
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return fmt.Errorf("failed to read message: %w", err)
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}
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return nil
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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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return c.conn.Close(ws.StatusNormalClosure, "")
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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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ctx, cancel := context.WithTimeoutCause(
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ctx, time.Millisecond*800, errors.New("ping took too long"),
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)
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defer cancel()
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return c.conn.Ping(ctx)
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}
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