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les, les/lespay: implement new server pool (#20758)

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This PR reimplements the light client server pool. It is also a first step
to move certain logic into a new lespay package. This package will contain
the implementation of the lespay token sale functions, the token buying and
selling logic and other components related to peer selection/prioritization
and service quality evaluation. Over the long term this package will be
reusable for incentivizing future protocols.

Since the LES peer logic is now based on enode.Iterator, it can now use
DNS-based fallback discovery to find servers.

This document describes the function of the new components:
https://gist.github.com/zsfelfoldi/3c7ace895234b7b345ab4f71dab102d4
This commit is contained in:
Felföldi Zsolt
2020-05-22 13:46:34 +02:00
committed by GitHub
parent 65ce550b37
commit b4a2681120
30 changed files with 2904 additions and 1028 deletions
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21
cmd/utils/flags.go
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@ -1563,19 +1563,19 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
cfg.NetworkId = 3
}
cfg.Genesis = core.DefaultRopstenGenesisBlock()
setDNSDiscoveryDefaults(cfg, params.KnownDNSNetworks[params.RopstenGenesisHash])
setDNSDiscoveryDefaults(cfg, params.RopstenGenesisHash)
case ctx.GlobalBool(RinkebyFlag.Name):
if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
cfg.NetworkId = 4
}
cfg.Genesis = core.DefaultRinkebyGenesisBlock()
setDNSDiscoveryDefaults(cfg, params.KnownDNSNetworks[params.RinkebyGenesisHash])
setDNSDiscoveryDefaults(cfg, params.RinkebyGenesisHash)
case ctx.GlobalBool(GoerliFlag.Name):
if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
cfg.NetworkId = 5
}
cfg.Genesis = core.DefaultGoerliGenesisBlock()
setDNSDiscoveryDefaults(cfg, params.KnownDNSNetworks[params.GoerliGenesisHash])
setDNSDiscoveryDefaults(cfg, params.GoerliGenesisHash)
case ctx.GlobalBool(DeveloperFlag.Name):
if !ctx.GlobalIsSet(NetworkIdFlag.Name) {
cfg.NetworkId = 1337
@ -1604,18 +1604,25 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
}
default:
if cfg.NetworkId == 1 {
setDNSDiscoveryDefaults(cfg, params.KnownDNSNetworks[params.MainnetGenesisHash])
setDNSDiscoveryDefaults(cfg, params.MainnetGenesisHash)
}
}
}
// setDNSDiscoveryDefaults configures DNS discovery with the given URL if
// no URLs are set.
func setDNSDiscoveryDefaults(cfg *eth.Config, url string) {
func setDNSDiscoveryDefaults(cfg *eth.Config, genesis common.Hash) {
if cfg.DiscoveryURLs != nil {
return
return // already set through flags/config
}
protocol := "eth"
if cfg.SyncMode == downloader.LightSync {
protocol = "les"
}
if url := params.KnownDNSNetwork(genesis, protocol); url != "" {
cfg.DiscoveryURLs = []string{url}
}
cfg.DiscoveryURLs = []string{url}
}
// RegisterEthService adds an Ethereum client to the stack.