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info.go
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/
info.go
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package p2p
import (
"bytes"
"fmt"
"net/http"
"strings"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/peer"
ma "github.com/multiformats/go-multiaddr"
"github.com/sirupsen/logrus"
)
// InfoHandler is a handler to serve /p2p page in metrics.
func (s *Service) InfoHandler(w http.ResponseWriter, _ *http.Request) {
buf := new(bytes.Buffer)
if _, err := fmt.Fprintf(buf, `bootnode=%s
self=%s
%d peers
%v
`,
s.cfg.BootstrapNodeAddr,
selfAddresses(s.host),
len(s.host.Network().Peers()),
formatPeers(s.host), // Must be last. Writes one entry per row.
); err != nil {
logrus.WithError(err).Error("Failed to render p2p info page")
return
}
w.WriteHeader(http.StatusOK)
if _, err := w.Write(buf.Bytes()); err != nil {
log.WithError(err).Error("Failed to render p2p info page")
}
}
// selfAddresses formats the host data into dialable strings, comma separated.
func selfAddresses(h host.Host) string {
var addresses []string
for _, ma := range h.Addrs() {
addresses = append(addresses, ma.String()+"/p2p/"+h.ID().Pretty())
}
return strings.Join(addresses, ",")
}
// Format peer list to dialable addresses, separated by new line.
func formatPeers(h host.Host) string {
var addresses []string
for _, pid := range h.Network().Peers() {
addresses = append(addresses, formatPeer(pid, h.Peerstore().PeerInfo(pid).Addrs))
}
return strings.Join(addresses, "\n")
}
// Format single peer info to dialable addresses, comma separated.
func formatPeer(pid peer.ID, ma []ma.Multiaddr) string {
var addresses []string
for _, a := range ma {
addresses = append(addresses, a.String()+"/p2p/"+pid.Pretty())
}
return strings.Join(addresses, ",")
}