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// Package smux is a multiplexing library for Golang.
//
// It relies on an underlying connection to provide reliability and ordering, such as TCP or KCP,
// and provides stream-oriented multiplexing over a single channel.
package smux
import (
"errors"
"fmt"
"io"
"math"
"time"
)
// Config is used to tune the Smux session
type Config struct {
// SMUX Protocol version, support 1,2
Version int
// Disabled keepalive
KeepAliveDisabled bool
// KeepAliveInterval is how often to send a NOP command to the remote
KeepAliveInterval time.Duration
// KeepAliveTimeout is how long the session
// will be closed if no data has arrived
KeepAliveTimeout time.Duration
// MaxFrameSize is used to control the maximum
// frame size to sent to the remote
MaxFrameSize int
// MaxReceiveBuffer is used to control the maximum
// number of data in the buffer pool
MaxReceiveBuffer int
// MaxStreamBuffer is used to control the maximum
// number of data per stream
MaxStreamBuffer int
}
// DefaultConfig is used to return a default configuration
func DefaultConfig() *Config {
return &Config{
Version: 1,
KeepAliveInterval: 10 * time.Second,
KeepAliveTimeout: 30 * time.Second,
MaxFrameSize: 32768,
MaxReceiveBuffer: 4194304,
MaxStreamBuffer: 65536,
}
}
// VerifyConfig is used to verify the sanity of configuration
func VerifyConfig(config *Config) error {
if !(config.Version == 1 || config.Version == 2) {
return errors.New("unsupported protocol version")
}
if !config.KeepAliveDisabled {
if config.KeepAliveInterval == 0 {
return errors.New("keep-alive interval must be positive")
}
if config.KeepAliveTimeout < config.KeepAliveInterval {
return fmt.Errorf("keep-alive timeout must be larger than keep-alive interval")
}
}
if config.MaxFrameSize <= 0 {
return errors.New("max frame size must be positive")
}
if config.MaxFrameSize > 65535 {
return errors.New("max frame size must not be larger than 65535")
}
if config.MaxReceiveBuffer <= 0 {
return errors.New("max receive buffer must be positive")
}
if config.MaxStreamBuffer <= 0 {
return errors.New("max stream buffer must be positive")
}
if config.MaxStreamBuffer > config.MaxReceiveBuffer {
return errors.New("max stream buffer must not be larger than max receive buffer")
}
if config.MaxStreamBuffer > math.MaxInt32 {
return errors.New("max stream buffer cannot be larger than 2147483647")
}
return nil
}
// Server is used to initialize a new server-side connection.
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.
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
}
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