Add system activity tracking and event store (#636)

This PR adds system activity tracking. 
The management service records events like 
add/remove peer,  group, rule, route, etc.

The activity events are stored in the SQLite event store
and can be queried by the HTTP API.

management/server/peer.go

@@ -1,7 +1,9 @@
 package server
 
 import (
+	"fmt"
 	nbdns "github.com/netbirdio/netbird/dns"
+	"github.com/netbirdio/netbird/management/server/activity"
 	"github.com/netbirdio/netbird/management/server/status"
 	"net"
 	"strings"
@@ -73,6 +75,19 @@ func (p *Peer) Copy() *Peer {
 	}
 }
 
+// FQDN returns peers FQDN combined of the peer's DNS label and the system's DNS domain
+func (p *Peer) FQDN(dnsDomain string) string {
+	if dnsDomain == "" {
+		return ""
+	}
+	return fmt.Sprintf("%s.%s", p.DNSLabel, dnsDomain)
+}
+
+// EventMeta returns activity event meta related to the peer
+func (p *Peer) EventMeta(dnsDomain string) map[string]any {
+	return map[string]any{"name": p.Name, "fqdn": p.FQDN(dnsDomain), "ip": p.IP}
+}
+
 // Copy PeerStatus
 func (p *PeerStatus) Copy() *PeerStatus {
 	return &PeerStatus{
@@ -216,7 +231,7 @@ func (am *DefaultAccountManager) UpdatePeer(accountID string, update *Peer) (*Pe
 }
 
 // DeletePeer removes peer from the account by its IP
-func (am *DefaultAccountManager) DeletePeer(accountID string, peerPubKey string) (*Peer, error) {
+func (am *DefaultAccountManager) DeletePeer(accountID, peerPubKey, userID string) (*Peer, error) {
 
 	unlock := am.Store.AcquireAccountLock(accountID)
 	defer unlock()
@@ -262,6 +277,18 @@ func (am *DefaultAccountManager) DeletePeer(accountID string, peerPubKey string)
 	}
 
 	am.peersUpdateManager.CloseChannel(peerPubKey)
+	event := &activity.Event{
+		Timestamp:   time.Now(),
+		AccountID:   account.Id,
+		InitiatorID: userID,
+		TargetID:    peer.IP.String(),
+		Activity:    activity.PeerRemovedByUser,
+		Meta:        peer.EventMeta(am.GetDNSDomain()),
+	}
+	_, err = am.eventStore.Save(event)
+	if err != nil {
+		return nil, err
+	}
 	return peer, nil
 }
 
@@ -359,6 +386,11 @@ func (am *DefaultAccountManager) AddPeer(setupKey, userID string, peer *Peer) (*
 		return nil, err
 	}
 
+	opEvent := &activity.Event{
+		Timestamp: time.Now(),
+		AccountID: account.Id,
+	}
+
 	if !addedByUser {
 		// validate the setup key if adding with a key
 		sk, err := account.FindSetupKey(upperKey)
@@ -371,6 +403,11 @@ func (am *DefaultAccountManager) AddPeer(setupKey, userID string, peer *Peer) (*
 		}
 
 		account.SetupKeys[sk.Key] = sk.IncrementUsage()
+		opEvent.InitiatorID = sk.Id
+		opEvent.Activity = activity.PeerAddedWithSetupKey
+	} else {
+		opEvent.InitiatorID = userID
+		opEvent.Activity = activity.PeerAddedByUser
 	}
 
 	takenIps := account.getTakenIPs()
@@ -436,6 +473,13 @@ func (am *DefaultAccountManager) AddPeer(setupKey, userID string, peer *Peer) (*
 		return nil, err
 	}
 
+	opEvent.TargetID = newPeer.IP.String()
+	opEvent.Meta = newPeer.EventMeta(am.GetDNSDomain())
+	_, err = am.eventStore.Save(opEvent)
+	if err != nil {
+		return nil, err
+	}
+
 	return newPeer, nil
 }