71 lines
2.4 KiB
Go
71 lines
2.4 KiB
Go
// Code generated by go generate. DO NOT EDIT.
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// Source: sys_conn_buffers.go
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package quic
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import (
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"errors"
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"fmt"
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"net"
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"syscall"
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"github.com/quic-go/quic-go/internal/protocol"
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"github.com/quic-go/quic-go/internal/utils"
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)
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func setSendBuffer(c net.PacketConn, logger utils.Logger) error {
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conn, ok := c.(interface{ SetWriteBuffer(int) error })
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if !ok {
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return errors.New("connection doesn't allow setting of send buffer size. Not a *net.UDPConn?")
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}
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var syscallConn syscall.RawConn
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if sc, ok := c.(interface {
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SyscallConn() (syscall.RawConn, error)
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}); ok {
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var err error
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syscallConn, err = sc.SyscallConn()
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if err != nil {
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syscallConn = nil
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}
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}
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// The connection has a SetWriteBuffer method, but we couldn't obtain a syscall.RawConn.
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// This shouldn't happen for a net.UDPConn, but is possible if the connection just implements the
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// net.PacketConn interface and the SetWriteBuffer method.
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// We have no way of checking if increasing the buffer size actually worked.
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if syscallConn == nil {
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return conn.SetWriteBuffer(protocol.DesiredSendBufferSize)
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}
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size, err := inspectWriteBuffer(syscallConn)
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if err != nil {
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return fmt.Errorf("failed to determine send buffer size: %w", err)
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}
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if size >= protocol.DesiredSendBufferSize {
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logger.Debugf("Conn has send buffer of %d kiB (wanted: at least %d kiB)", size/1024, protocol.DesiredSendBufferSize/1024)
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return nil
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}
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// Ignore the error. We check if we succeeded by querying the buffer size afterward.
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_ = conn.SetWriteBuffer(protocol.DesiredSendBufferSize)
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newSize, err := inspectWriteBuffer(syscallConn)
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if newSize < protocol.DesiredSendBufferSize {
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// Try again with RCVBUFFORCE on Linux
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_ = forceSetSendBuffer(syscallConn, protocol.DesiredSendBufferSize)
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newSize, err = inspectWriteBuffer(syscallConn)
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if err != nil {
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return fmt.Errorf("failed to determine send buffer size: %w", err)
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}
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}
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if err != nil {
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return fmt.Errorf("failed to determine send buffer size: %w", err)
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}
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if newSize == size {
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return fmt.Errorf("failed to increase send buffer size (wanted: %d kiB, got %d kiB)", protocol.DesiredSendBufferSize/1024, newSize/1024)
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}
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if newSize < protocol.DesiredSendBufferSize {
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return fmt.Errorf("failed to sufficiently increase send buffer size (was: %d kiB, wanted: %d kiB, got: %d kiB)", size/1024, protocol.DesiredSendBufferSize/1024, newSize/1024)
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}
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logger.Debugf("Increased send buffer size to %d kiB", newSize/1024)
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return nil
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}
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