88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
package yamux
|
|
|
|
import (
|
|
"fmt"
|
|
"io"
|
|
"os"
|
|
"time"
|
|
)
|
|
|
|
// Config is used to tune the Yamux session
|
|
type Config struct {
|
|
// AcceptBacklog is used to limit how many streams may be
|
|
// waiting an accept.
|
|
AcceptBacklog int
|
|
|
|
// EnableKeepalive is used to do a period keep alive
|
|
// messages using a ping.
|
|
EnableKeepAlive bool
|
|
|
|
// KeepAliveInterval is how often to perform the keep alive
|
|
KeepAliveInterval time.Duration
|
|
|
|
// ConnectionWriteTimeout is meant to be a "safety valve" timeout after
|
|
// we which will suspect a problem with the underlying connection and
|
|
// close it. This is only applied to writes, where's there's generally
|
|
// an expectation that things will move along quickly.
|
|
ConnectionWriteTimeout time.Duration
|
|
|
|
// MaxStreamWindowSize is used to control the maximum
|
|
// window size that we allow for a stream.
|
|
MaxStreamWindowSize uint32
|
|
|
|
// LogOutput is used to control the log destination
|
|
LogOutput io.Writer
|
|
}
|
|
|
|
// DefaultConfig is used to return a default configuration
|
|
func DefaultConfig() *Config {
|
|
return &Config{
|
|
AcceptBacklog: 256,
|
|
EnableKeepAlive: true,
|
|
KeepAliveInterval: 30 * time.Second,
|
|
ConnectionWriteTimeout: 10 * time.Second,
|
|
MaxStreamWindowSize: initialStreamWindow,
|
|
LogOutput: os.Stderr,
|
|
}
|
|
}
|
|
|
|
// VerifyConfig is used to verify the sanity of configuration
|
|
func VerifyConfig(config *Config) error {
|
|
if config.AcceptBacklog <= 0 {
|
|
return fmt.Errorf("backlog must be positive")
|
|
}
|
|
if config.KeepAliveInterval == 0 {
|
|
return fmt.Errorf("keep-alive interval must be positive")
|
|
}
|
|
if config.MaxStreamWindowSize < initialStreamWindow {
|
|
return fmt.Errorf("MaxStreamWindowSize must be larger than %d", initialStreamWindow)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Server is used to initialize a new server-side connection.
|
|
// There must be at most one server-side connection. If a nil config is
|
|
// provided, the DefaultConfiguration will be used.
|
|
func Server(conn io.ReadWriteCloser, config *Config) (*Session, error) {
|
|
if config == nil {
|
|
config = DefaultConfig()
|
|
}
|
|
if err := VerifyConfig(config); err != nil {
|
|
return nil, err
|
|
}
|
|
return newSession(config, conn, false), nil
|
|
}
|
|
|
|
// Client is used to initialize a new client-side connection.
|
|
// There must be at most one client-side connection.
|
|
func Client(conn io.ReadWriteCloser, config *Config) (*Session, error) {
|
|
if config == nil {
|
|
config = DefaultConfig()
|
|
}
|
|
|
|
if err := VerifyConfig(config); err != nil {
|
|
return nil, err
|
|
}
|
|
return newSession(config, conn, true), nil
|
|
}
|