core/webapi/Status.go

/*
File Username:  Status.go
Copyright:  2021 Peernet Foundation s.r.o.
Author:     Peter Kleissner
*/

package webapi

import (
	"encoding/hex"
	"fmt"
	"net/http"
	"strconv"
)

func apiTest(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(http.StatusOK)
	w.Write([]byte("ok"))
}

type apiResponseStatus struct {
	Status        int  `json:"status"`        // Status code: 0 = Ok.
	IsConnected   bool `json:"isconnected"`   // Whether connected to Peernet.
	CountPeerList int  `json:"countpeerlist"` // Count of peers in the peer list. Note that this contains peers that are considered inactive, but have not yet been removed from the list.
	CountNetwork  int  `json:"countnetwork"`  // Count of total peers in the network.
	// This is usually a higher number than CountPeerList, which just represents the current number of connected peers.
	// The CountNetwork number is going to be queried from root peers which may or may not have a limited view.
}

/*
apiStatus returns the current connectivity status to the network
Request:    GET /status
Result:     200 with JSON structure Status
*/
func (api *WebapiInstance) apiStatus(w http.ResponseWriter, r *http.Request) {
	status := apiResponseStatus{Status: 0, CountPeerList: api.Backend.PeerlistCount()}
	status.CountNetwork = status.CountPeerList // For now always same as CountPeerList, until native Statistics message to root peers is available.

	// Connected: If at leat 2 peers.
	// This metric needs to be improved in the future, as root peers never disconnect.
	// Instead, the core should keep a count of "active peers".
	status.IsConnected = status.CountPeerList >= 2

	EncodeJSON(api.Backend, w, r, status)
}

type apiResponsePeerSelf struct {
	PeerID string `json:"peerid"` // Peer ID. This is derived from the public in compressed form.
	NodeID string `json:"nodeid"` // Node ID. This is the blake3 hash of the peer ID and used in the DHT.
}

/*
apiAccountInfo provides information about the current account.
Request:    GET /account/info
Result:     200 with JSON structure apiResponsePeerSelf
*/
func (api *WebapiInstance) apiAccountInfo(w http.ResponseWriter, r *http.Request) {
	response := apiResponsePeerSelf{}
	response.NodeID = hex.EncodeToString(api.Backend.SelfNodeID())

	_, publicKey := api.Backend.ExportPrivateKey()
	response.PeerID = hex.EncodeToString(publicKey.SerializeCompressed())

	EncodeJSON(api.Backend, w, r, response)
}

/*
apiAccountDelete deletes the current account. The confirm parameter must include the user's choice.
Request:    GET /account/delete?confirm=[0 or 1]
Result:     204 if the user choses not to delete the account

	200 if successfully deleted
*/
func (api *WebapiInstance) apiAccountDelete(w http.ResponseWriter, r *http.Request) {
	r.ParseForm()
	if confirm, _ := strconv.ParseBool(r.Form.Get("confirm")); !confirm {
		w.WriteHeader(http.StatusNoContent)
		return
	}

	api.Backend.DeleteAccount()

	w.WriteHeader(http.StatusOK)
}

/*
apiStatusPeers returns the information about peers currently connected.
The GeoIP information may not alawys be available, for example if the GeoIP file is not available or the mapping from IP address to location is not available.
Peers that are connected only via local network will not have a geo location.

Request:    GET /status/peers
Result:     200 with JSON array apiResponsePeerInfo
*/
func (api *WebapiInstance) apiStatusPeers(w http.ResponseWriter, r *http.Request) {
	var peers []apiResponsePeerInfo

	// query all nodes
	for _, peer := range api.Backend.PeerlistGet() {
		peerInfo := apiResponsePeerInfo{
			PeerID:            peer.PublicKey.SerializeCompressed(),
			NodeID:            peer.NodeID,
			UserAgent:         peer.UserAgent,
			IsRoot:            peer.IsRootPeer,
			BlockchainHeight:  peer.BlockchainHeight,
			BlockchainVersion: peer.BlockchainVersion,
		}

		if latitude, longitude, valid := api.Peer2GeoIP(peer); valid {
			peerInfo.GeoIP = fmt.Sprintf("%.4f", latitude) + "," + fmt.Sprintf("%.4f", longitude)
		}

		peers = append(peers, peerInfo)
	}

	EncodeJSON(api.Backend, w, r, peers)
}

type apiResponsePeerInfo struct {
	PeerID            []byte `json:"peerid"`            // Peer ID. This is derived from the public in compressed form.
	NodeID            []byte `json:"nodeid"`            // Node ID. This is the blake3 hash of the peer ID and used in the DHT.
	GeoIP             string `json:"geoip"`             // GeoIP location as "Latitude,Longitude" CSV format. Empty if location not available.
	UserAgent         string `json:"useragent"`         // User Agent.
	IsRoot            bool   `json:"isroot"`            // If the peer is a root peer.
	BlockchainHeight  uint64 `json:"blockchainheight"`  // Blockchain height
	BlockchainVersion uint64 `json:"blockchainversion"` // Blockchain version
}