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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-12-22 18:17:52 -05:00
v2fly/transport/pipe/pipe.go
2018-10-11 22:34:31 +02:00

79 lines
1.5 KiB
Go

package pipe
import (
"context"
"v2ray.com/core/common/signal"
"v2ray.com/core/common/signal/done"
"v2ray.com/core/features/policy"
)
// Option for creating new Pipes.
type Option func(*pipe)
// WithoutSizeLimit returns an Option for Pipe to have no size limit.
func WithoutSizeLimit() Option {
return func(p *pipe) {
p.limit = -1
}
}
// WithSizeLimit returns an Option for Pipe to have the given size limit.
func WithSizeLimit(limit int32) Option {
return func(p *pipe) {
p.limit = limit
}
}
// DiscardOverflow returns an Option for Pipe to discard writes if full.
func DiscardOverflow() Option {
return func(p *pipe) {
p.discardOverflow = true
}
}
// OptionsFromContext returns a list of Options from context.
func OptionsFromContext(ctx context.Context) []Option {
var opt []Option
bp := policy.BufferPolicyFromContext(ctx)
if bp.PerConnection >= 0 {
opt = append(opt, WithSizeLimit(bp.PerConnection))
} else {
opt = append(opt, WithoutSizeLimit())
}
return opt
}
// New creates a new Reader and Writer that connects to each other.
func New(opts ...Option) (*Reader, *Writer) {
p := &pipe{
limit: -1,
readSignal: signal.NewNotifier(),
writeSignal: signal.NewNotifier(),
done: done.New(),
}
for _, opt := range opts {
opt(p)
}
return &Reader{
pipe: p,
}, &Writer{
pipe: p,
}
}
type closeError interface {
CloseError()
}
// CloseError invokes CloseError() method if the object is either Reader or Writer.
func CloseError(v interface{}) {
if c, ok := v.(closeError); ok {
c.CloseError()
}
}