Add webapi. Provides an HTTP API for clients to use Peernet.

webapi/Status.go

@@ -0,0 +1,60 @@
+/*
+File Name:  Status.go
+Copyright:  2021 Peernet Foundation s.r.o.
+Author:     Peter Kleissner
+*/
+
+package webapi
+
+import (
+	"encoding/hex"
+	"net/http"
+
+	"github.com/PeernetOfficial/core"
+)
+
+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 apiStatus(w http.ResponseWriter, r *http.Request) {
+	status := apiResponseStatus{Status: 0, CountPeerList: core.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
+
+	apiEncodeJSON(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.
+}
+
+/*
+apiPeerSelf provides information about the self peer details
+Request:    GET /peer/self
+Result:     200 with JSON structure apiResponsePeerSelf
+*/
+func apiPeerSelf(w http.ResponseWriter, r *http.Request) {
+	response := apiResponsePeerSelf{}
+	response.NodeID = hex.EncodeToString(core.SelfNodeID())
+
+	_, publicKey := core.ExportPrivateKey()
+	response.PeerID = hex.EncodeToString(publicKey.SerializeCompressed())
+
+	apiEncodeJSON(w, r, response)
+}