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https://github.com/ethereum/go-ethereum.git
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69 lines
2.3 KiB
Go
69 lines
2.3 KiB
Go
// Copyright 2023 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package request
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type request interface {
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CanSendTo(server *Server) (canSend bool, priority uint64)
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SendTo(server *Server)
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}
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// Environment allows Module.Process to send requests to a set of servers. The enabled server set can either be all servers that are not delayed or timed out (in case of a module trigger) or a subset of them that have been triggered by a server trigger.
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type Environment struct {
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*HeadTracker
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scheduler *Scheduler
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allServers []*Server
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canRequestNow map[*Server]struct{}
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}
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func (s *Environment) TryRequest(req request) (sent, tryMore bool) {
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var (
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maxServerPriority, maxRequestPriority uint64
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bestServer *Server
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)
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for server := range s.canRequestNow {
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canRequest, serverPriority := server.CanRequestNow()
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if !canRequest {
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delete(s.canRequestNow, server)
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continue
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}
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canSend, requestPriority := req.CanSendTo(server)
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if !canSend || requestPriority < maxRequestPriority ||
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(requestPriority == maxRequestPriority && serverPriority <= maxServerPriority) {
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continue
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}
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maxServerPriority, maxRequestPriority = serverPriority, requestPriority
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bestServer = server
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}
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if bestServer != nil {
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req.SendTo(bestServer)
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return true, true
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}
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return false, len(s.canRequestNow) > 0
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}
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func (s *Environment) CanRequestNow() bool {
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return len(s.canRequestNow) > 0
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}
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func (s *Environment) CanRequestLater(req request) bool {
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for _, server := range s.allServers {
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if canSend, _ := req.CanSendTo(server); canSend {
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return true
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}
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}
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return false
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}
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