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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(*pipeOption)
// WithoutSizeLimit returns an Option for Pipe to have no size limit.
func WithoutSizeLimit() Option {
return func(opt *pipeOption) {
opt.limit = -1
}
}
// WithSizeLimit returns an Option for Pipe to have the given size limit.
func WithSizeLimit(limit int32) Option {
return func(opt *pipeOption) {
opt.limit = limit
}
}
// DiscardOverflow returns an Option for Pipe to discard writes if full.
func DiscardOverflow() Option {
return func(opt *pipeOption) {
opt.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{
readSignal: signal.NewNotifier(),
writeSignal: signal.NewNotifier(),
done: done.New(),
option: pipeOption{
limit: -1,
},
}
for _, opt := range opts {
opt(&(p.option))
}
return &Reader{
pipe: p,
}, &Writer{
pipe: p,
}
}
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