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https://github.com/cwinfo/yggdrasil-go.git
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safer dial timeout handling, in case it was used with a nil context or a context that had no timeout set
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eccd9a348f
commit
681c8ca6f9
@ -19,15 +19,12 @@ type Dialer struct {
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// Dial opens a session to the given node. The first paramter should be "nodeid"
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// Dial opens a session to the given node. The first paramter should be "nodeid"
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// and the second parameter should contain a hexadecimal representation of the
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// and the second parameter should contain a hexadecimal representation of the
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// target node ID. Internally, it uses DialContext with a 6-second timeout.
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// target node ID. It uses DialContext internally.
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func (d *Dialer) Dial(network, address string) (net.Conn, error) {
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func (d *Dialer) Dial(network, address string) (net.Conn, error) {
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const timeout = 6 * time.Second
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return d.DialContext(nil, network, address)
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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return d.DialContext(ctx, network, address)
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}
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}
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// DialContext is used internally by Dial, and should only be used with a context that includes a timeout.
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// DialContext is used internally by Dial, and should only be used with a context that includes a timeout. It uses DialByNodeIDandMask internally.
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func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
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func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
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var nodeID crypto.NodeID
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var nodeID crypto.NodeID
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var nodeMask crypto.NodeID
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var nodeMask crypto.NodeID
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@ -66,7 +63,7 @@ func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.
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}
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}
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// DialByNodeIDandMask opens a session to the given node based on raw
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// DialByNodeIDandMask opens a session to the given node based on raw
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// NodeID parameters.
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// NodeID parameters. If ctx is nil or has no timeout, then a default timeout of 6 seconds will apply, beginning *after* the search finishes.
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func (d *Dialer) DialByNodeIDandMask(ctx context.Context, nodeID, nodeMask *crypto.NodeID) (net.Conn, error) {
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func (d *Dialer) DialByNodeIDandMask(ctx context.Context, nodeID, nodeMask *crypto.NodeID) (net.Conn, error) {
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conn := newConn(d.core, nodeID, nodeMask, nil)
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conn := newConn(d.core, nodeID, nodeMask, nil)
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if err := conn.search(); err != nil {
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if err := conn.search(); err != nil {
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@ -75,10 +72,19 @@ func (d *Dialer) DialByNodeIDandMask(ctx context.Context, nodeID, nodeMask *cryp
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return nil, err
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return nil, err
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}
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}
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conn.session.setConn(nil, conn)
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conn.session.setConn(nil, conn)
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var c context.Context
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var cancel context.CancelFunc
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const timeout = 6 * time.Second
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if ctx != nil {
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c, cancel = context.WithTimeout(ctx, timeout)
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} else {
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c, cancel = context.WithTimeout(context.Background(), timeout)
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}
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defer cancel()
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select {
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select {
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case <-conn.session.init:
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case <-conn.session.init:
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return conn, nil
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return conn, nil
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case <-ctx.Done():
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case <-c.Done():
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conn.Close()
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conn.Close()
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return nil, errors.New("session handshake timeout")
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return nil, errors.New("session handshake timeout")
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}
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}
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