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https://github.com/ethereum/go-ethereum.git
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77 lines
2.4 KiB
Go
77 lines
2.4 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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import (
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"math"
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"github.com/ethereum/go-ethereum/log"
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)
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type (
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Request any
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Response any
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ID uint64
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ServerAndId struct {
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Server Server
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Id ID
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}
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)
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// one per sync process
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type RequestTracker struct {
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servers serverSet // one per trigger
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scheduler *Scheduler
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module Module
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requestEvents []RequestEvent
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}
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func (p *RequestTracker) TryRequest(requestFn func(server Server) (Request, float32)) (ServerAndId, Request) {
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var (
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maxServerPriority, maxRequestPriority float32
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bestServer Server
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bestRequest Request
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)
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maxServerPriority, maxRequestPriority = -math.MaxFloat32, -math.MaxFloat32
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serverCount := len(p.servers)
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var removed, candidates int
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for server, _ := range p.servers {
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canRequest, serverPriority := server.CanRequestNow()
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if !canRequest {
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delete(p.servers, server)
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removed++
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continue
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}
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request, requestPriority := requestFn(server)
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if request != nil {
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candidates++
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}
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if request == nil || 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, bestRequest = server, request
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}
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log.Debug("Request attempt", "serverCount", serverCount, "removedServers", removed, "requestCandidates", candidates)
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if bestServer == nil {
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return ServerAndId{}, nil
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}
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id := ServerAndId{Server: bestServer, Id: bestServer.SendRequest(bestRequest)}
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p.scheduler.pending[id] = pendingRequest{request: bestRequest, module: p.module}
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return id, bestRequest
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}
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