status-go/services/mailservers/tcp_ping.go

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package mailservers
import (
"context"
"fmt"
"net"
"time"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/p2p/enr"
"github.com/status-im/status-go/rtt"
)
type PingQuery struct {
Addresses []string `json:"addresses"`
TimeoutMs int `json:"timeoutMs"`
}
type PingResult struct {
ENode string `json:"address"`
RTTMs *int `json:"rttMs"`
Err *string `json:"error"`
}
func (pr *PingResult) Update(rttMs int, err error) {
if err != nil {
errStr := err.Error()
pr.Err = &errStr
}
if rttMs > 0 {
pr.RTTMs = &rttMs
} else {
pr.RTTMs = nil
}
}
func enodeToAddr(enodeAddr string) (string, error) {
node, err := enode.ParseV4(enodeAddr)
if err != nil {
return "", err
}
var ip4 enr.IPv4
err = node.Load(&ip4)
if err != nil {
return "", err
}
var tcp enr.TCP
err = node.Load(&tcp)
if err != nil {
return "", err
}
return fmt.Sprintf("%s:%d", net.IP(ip4).String(), tcp), nil
}
func parseEnodes(enodes []string) (map[string]*PingResult, []string) {
// parse enode addreses into normal host + port addresses
results := make(map[string]*PingResult, len(enodes))
var toPing []string
for i := range enodes {
addr, err := enodeToAddr(enodes[i])
if err != nil {
// using enode since it's irrelevant but needs to be unique
errStr := err.Error()
results[enodes[i]] = &PingResult{ENode: enodes[i], Err: &errStr}
continue
}
results[addr] = &PingResult{ENode: enodes[i]}
toPing = append(toPing, addr)
}
return results, toPing
}
func mapValues(m map[string]*PingResult) []*PingResult {
rval := make([]*PingResult, 0, len(m))
for _, value := range m {
rval = append(rval, value)
}
return rval
}
func (a *API) Ping(ctx context.Context, pq PingQuery) ([]*PingResult, error) {
timeout := time.Duration(pq.TimeoutMs) * time.Millisecond
// parse enodes into pingable addresses
resultsMap, toPing := parseEnodes(pq.Addresses)
// run the checks concurrently
results, err := rtt.CheckHosts(toPing, timeout)
if err != nil {
return nil, err
}
// set ping results
for i := range results {
r := results[i]
pr := resultsMap[r.Addr]
if pr == nil {
continue
}
pr.Update(r.RTTMs, r.Err)
}
return mapValues(resultsMap), nil
}