status-go/vendor/github.com/libp2p/go-yamux/mux.go

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package yamux
import (
"fmt"
"io"
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"net"
"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
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// ReadBufSize controls the size of the read buffer.
//
// Set to 0 to disable it.
ReadBufSize int
// WriteCoalesceDelay is the maximum amount of time we'll delay
// coalescing a packet before sending it. This should be on the order of
// micro-milliseconds.
WriteCoalesceDelay time.Duration
// MaxMessageSize is the maximum size of a message that we'll send on a
// stream. This ensures that a single stream doesn't hog a connection.
MaxMessageSize uint32
}
// 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,
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ReadBufSize: 4096,
MaxMessageSize: 64 * 1024, // Means 64KiB/10s = 52kbps minimum speed.
WriteCoalesceDelay: 100 * time.Microsecond,
}
}
// 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)
}
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if config.MaxMessageSize < 1024 {
return fmt.Errorf("MaxMessageSize must be greater than a kilobyte")
}
if config.WriteCoalesceDelay < 0 {
return fmt.Errorf("WriteCoalesceDelay must be >= 0")
}
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.
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func Server(conn net.Conn, config *Config) (*Session, error) {
if config == nil {
config = DefaultConfig()
}
if err := VerifyConfig(config); err != nil {
return nil, err
}
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return newSession(config, conn, false, config.ReadBufSize), nil
}
// Client is used to initialize a new client-side connection.
// There must be at most one client-side connection.
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func Client(conn net.Conn, config *Config) (*Session, error) {
if config == nil {
config = DefaultConfig()
}
if err := VerifyConfig(config); err != nil {
return nil, err
}
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return newSession(config, conn, true, config.ReadBufSize), nil
}