2bd2e2e5ce
This commit introduces the chanacceptor package which is used to determine, by a set of heuristics, which open channel messages to accept and reject. Currently, two acceptors are implemented via the ChannelAcceptor interface: ChainedAcceptor and RPCAcceptor. The RPCAcceptor allows the RPC client to respond to the open channel request, and the ChainedAcceptor allows a conjunction of acceptors to be used.
66 lines
1.8 KiB
Go
66 lines
1.8 KiB
Go
package chanacceptor
|
|
|
|
import (
|
|
"sync"
|
|
"sync/atomic"
|
|
)
|
|
|
|
// ChainedAcceptor represents a conjunction of ChannelAcceptor results.
|
|
type ChainedAcceptor struct {
|
|
// acceptors is a map of ChannelAcceptors that will be evaluated when
|
|
// the ChainedAcceptor's Accept method is called.
|
|
acceptors map[uint64]ChannelAcceptor
|
|
acceptorsMtx sync.RWMutex
|
|
|
|
acceptorID uint64 // To be used atomically.
|
|
}
|
|
|
|
// NewChainedAcceptor initializes a ChainedAcceptor.
|
|
func NewChainedAcceptor() *ChainedAcceptor {
|
|
return &ChainedAcceptor{
|
|
acceptors: make(map[uint64]ChannelAcceptor),
|
|
}
|
|
}
|
|
|
|
// AddAcceptor adds a ChannelAcceptor to this ChainedAcceptor.
|
|
func (c *ChainedAcceptor) AddAcceptor(acceptor ChannelAcceptor) uint64 {
|
|
id := atomic.AddUint64(&c.acceptorID, 1)
|
|
|
|
c.acceptorsMtx.Lock()
|
|
c.acceptors[id] = acceptor
|
|
c.acceptorsMtx.Unlock()
|
|
|
|
// Return the id so that a caller can call RemoveAcceptor.
|
|
return id
|
|
}
|
|
|
|
// RemoveAcceptor removes a ChannelAcceptor from this ChainedAcceptor given
|
|
// an ID.
|
|
func (c *ChainedAcceptor) RemoveAcceptor(id uint64) {
|
|
c.acceptorsMtx.Lock()
|
|
delete(c.acceptors, id)
|
|
c.acceptorsMtx.Unlock()
|
|
}
|
|
|
|
// Accept evaluates the results of all ChannelAcceptors in the acceptors map
|
|
// and returns the conjunction of all these predicates.
|
|
//
|
|
// NOTE: Part of the ChannelAcceptor interface.
|
|
func (c *ChainedAcceptor) Accept(req *ChannelAcceptRequest) bool {
|
|
result := true
|
|
|
|
c.acceptorsMtx.RLock()
|
|
for _, acceptor := range c.acceptors {
|
|
// We call Accept first in case any acceptor (perhaps an RPCAcceptor)
|
|
// wishes to be notified about ChannelAcceptRequest.
|
|
result = acceptor.Accept(req) && result
|
|
}
|
|
c.acceptorsMtx.RUnlock()
|
|
|
|
return result
|
|
}
|
|
|
|
// A compile-time constraint to ensure ChainedAcceptor implements the
|
|
// ChannelAcceptor interface.
|
|
var _ ChannelAcceptor = (*ChainedAcceptor)(nil)
|