Management - add serial to Network reflecting network updates (#179)

* chore: [management] - add account serial ID

* Fix concurrency on the client (#183)

* reworked peer connection establishment logic eliminating race conditions and deadlocks while running many peers

* chore: move serial to Network from Account

* feature: increment Network serial ID when adding/removing peers

* chore: extract network struct init to network.go

* chore: add serial test when adding peer to the account

* test: add ModificationID test on AddPeer and DeletePeer

management/server/account.go

@@ -1,13 +1,11 @@
 package server
 
 import (
-	"github.com/google/uuid"
 	"github.com/rs/xid"
 	log "github.com/sirupsen/logrus"
 	"github.com/wiretrustee/wiretrustee/util"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
-	"net"
 	"sync"
 )
 
@@ -29,6 +27,12 @@ type Account struct {
 	Users     map[string]*User
 }
 
+// NewAccount creates a new Account with a generated ID and generated default setup keys
+func NewAccount(userId string) *Account {
+	accountId := xid.New().String()
+	return newAccountWithId(accountId, userId)
+}
+
 func (a *Account) Copy() *Account {
 	peers := map[string]*Peer{}
 	for id, peer := range a.Peers {
@@ -186,7 +190,7 @@ func (am *AccountManager) AddAccount(accountId string, userId string) (*Account,
 }
 
 func (am *AccountManager) createAccount(accountId string, userId string) (*Account, error) {
-	account, _ := newAccountWithId(accountId, userId)
+	account := newAccountWithId(accountId, userId)
 
 	err := am.Store.SaveAccount(account)
 	if err != nil {
@@ -197,7 +201,7 @@ func (am *AccountManager) createAccount(accountId string, userId string) (*Accou
 }
 
 // newAccountWithId creates a new Account with a default SetupKey (doesn't store in a Store) and provided id
-func newAccountWithId(accountId string, userId string) (*Account, *SetupKey) {
+func newAccountWithId(accountId string, userId string) *Account {
 
 	log.Debugf("creating new account")
 
@@ -206,22 +210,13 @@ func newAccountWithId(accountId string, userId string) (*Account, *SetupKey) {
 	oneOffKey := GenerateSetupKey("One-off key", SetupKeyOneOff, DefaultSetupKeyDuration)
 	setupKeys[defaultKey.Key] = defaultKey
 	setupKeys[oneOffKey.Key] = oneOffKey
-	network := &Network{
-		Id:  uuid.New().String(),
-		Net: net.IPNet{IP: net.ParseIP("100.64.0.0"), Mask: net.IPMask{255, 192, 0, 0}},
-		Dns: ""}
+	network := NewNetwork()
 	peers := make(map[string]*Peer)
 	users := make(map[string]*User)
 
 	log.Debugf("created new account %s with setup key %s", accountId, defaultKey.Key)
 
-	return &Account{Id: accountId, SetupKeys: setupKeys, Network: network, Peers: peers, Users: users, CreatedBy: userId}, defaultKey
-}
-
-// newAccount creates a new Account with a default SetupKey and a provided User.Id of a user who issued account creation (doesn't store in a Store)
-func newAccount(userId string) (*Account, *SetupKey) {
-	accountId := xid.New().String()
-	return newAccountWithId(accountId, userId)
+	return &Account{Id: accountId, SetupKeys: setupKeys, Network: network, Peers: peers, Users: users, CreatedBy: userId}
 }
 
 func getAccountSetupKeyById(acc *Account, keyId string) *SetupKey {

management/server/account_test.go

@@ -146,6 +146,8 @@ func TestAccountManager_AddPeer(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	serial := account.Network.Serial() //should be 0
+
 	var setupKey *SetupKey
 	for _, key := range account.SetupKeys {
 		setupKey = key
@@ -156,6 +158,11 @@ func TestAccountManager_AddPeer(t *testing.T) {
 		return
 	}
 
+	if account.Network.serial != 0 {
+		t.Errorf("expecting account network to have an initial serial=0")
+		return
+	}
+
 	key, err := wgtypes.GenerateKey()
 	if err != nil {
 		t.Fatal(err)
@@ -174,6 +181,12 @@ func TestAccountManager_AddPeer(t *testing.T) {
 		return
 	}
 
+	account, err = manager.GetAccount(account.Id)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
 	if peer.Key != expectedPeerKey {
 		t.Errorf("expecting just added peer to have key = %s, got %s", expectedPeerKey, peer.Key)
 	}
@@ -182,7 +195,64 @@ func TestAccountManager_AddPeer(t *testing.T) {
 		t.Errorf("expecting just added peer to have IP = %s, got %s", expectedPeerIP, peer.IP.String())
 	}
 
+	if account.Network.Serial() != 1 {
+		t.Errorf("expecting Network serial=%d to be incremented by 1 and be equal to %d when adding new peer to account", serial, account.Network.Serial())
+	}
+
 }
+
+func TestAccountManager_DeletePeer(t *testing.T) {
+	manager, err := createManager(t)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	account, err := manager.AddAccount("test_account", "account_creator")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var setupKey *SetupKey
+	for _, key := range account.SetupKeys {
+		setupKey = key
+	}
+
+	key, err := wgtypes.GenerateKey()
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	peerKey := key.PublicKey().String()
+
+	_, err = manager.AddPeer(setupKey.Key, Peer{
+		Key:  peerKey,
+		Meta: PeerSystemMeta{},
+		Name: peerKey,
+	})
+	if err != nil {
+		t.Errorf("expecting peer to be added, got failure %v", err)
+		return
+	}
+
+	_, err = manager.DeletePeer(account.Id, peerKey)
+	if err != nil {
+		return
+	}
+
+	account, err = manager.GetAccount(account.Id)
+	if err != nil {
+		t.Fatal(err)
+		return
+	}
+
+	if account.Network.Serial() != 2 {
+		t.Errorf("expecting Network serial=%d to be incremented and be equal to 2 after adding and deleteing a peer", account.Network.Serial())
+	}
+
+}
+
 func createManager(t *testing.T) (*AccountManager, error) {
 	store, err := createStore(t)
 	if err != nil {

management/server/file_store_test.go

@@ -32,7 +32,7 @@ func TestNewStore(t *testing.T) {
 func TestSaveAccount(t *testing.T) {
 	store := newStore(t)
 
-	account, _ := newAccount("testuser")
+	account := NewAccount("testuser")
 	account.Users["testuser"] = NewAdminUser("testuser")
 	setupKey := GenerateDefaultSetupKey()
 	account.SetupKeys[setupKey.Key] = setupKey
@@ -72,7 +72,7 @@ func TestSaveAccount(t *testing.T) {
 func TestStore(t *testing.T) {
 	store := newStore(t)
 
-	account, _ := newAccount("testuser")
+	account := NewAccount("testuser")
 	account.Users["testuser"] = NewAdminUser("testuser")
 	account.Peers["testpeer"] = &Peer{
 		Key:      "peerkey",

management/server/network.go

@@ -3,7 +3,9 @@ package server
 import (
 	"encoding/binary"
 	"fmt"
+	"github.com/rs/xid"
 	"net"
+	"sync"
 )
 
 var (
@@ -15,13 +17,42 @@ type Network struct {
 	Id  string
 	Net net.IPNet
 	Dns string
+	// serial is an ID that increments by 1 when any change to the network happened (e.g. new peer has been added).
+	// Used to synchronize state to the client apps.
+	serial uint64
+
+	mu sync.Mutex `json:"-"`
+}
+
+// NewNetwork creates a new Network initializing it with a serial=0
+func NewNetwork() *Network {
+	return &Network{
+		Id:     xid.New().String(),
+		Net:    net.IPNet{IP: net.ParseIP("100.64.0.0"), Mask: net.IPMask{255, 192, 0, 0}},
+		Dns:    "",
+		serial: 0}
+}
+
+// IncSerial increments serial by 1 reflecting that the network state has been changed
+func (n *Network) IncSerial() {
+	n.mu.Lock()
+	defer n.mu.Unlock()
+	n.serial = n.serial + 1
+}
+
+// Serial returns the Network.serial of the network (latest state id)
+func (n *Network) Serial() uint64 {
+	n.mu.Lock()
+	defer n.mu.Unlock()
+	return n.serial
 }
 
 func (n *Network) Copy() *Network {
 	return &Network{
-		Id:  n.Id,
-		Net: n.Net,
-		Dns: n.Dns,
+		Id:     n.Id,
+		Net:    n.Net,
+		Dns:    n.Dns,
+		serial: n.serial,
 	}
 }
 

management/server/peer.go

@@ -118,11 +118,22 @@ func (am *AccountManager) DeletePeer(accountId string, peerKey string) (*Peer, e
 	am.mux.Lock()
 	defer am.mux.Unlock()
 
+	account, err := am.Store.GetAccount(accountId)
+	if err != nil {
+		return nil, status.Errorf(codes.NotFound, "account not found")
+	}
+
 	peer, err := am.Store.DeletePeer(accountId, peerKey)
 	if err != nil {
 		return nil, err
 	}
 
+	account.Network.IncSerial()
+	err = am.Store.SaveAccount(account)
+	if err != nil {
+		return nil, err
+	}
+
 	err = am.peersUpdateManager.SendUpdate(peerKey,
 		&UpdateMessage{
 			Update: &proto.SyncResponse{
@@ -255,6 +266,8 @@ func (am *AccountManager) AddPeer(setupKey string, peer Peer) (*Peer, error) {
 
 	account.Peers[newPeer.Key] = newPeer
 	account.SetupKeys[sk.Key] = sk.IncrementUsage()
+	account.Network.IncSerial()
+
 	err = am.Store.SaveAccount(account)
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "failed adding peer")

management/server/user.go

@@ -47,7 +47,7 @@ func (am *AccountManager) GetOrCreateAccountByUser(userId string) (*Account, err
 	account, err := am.Store.GetUserAccount(userId)
 	if err != nil {
 		if s, ok := status.FromError(err); ok && s.Code() == codes.NotFound {
-			account, _ = newAccount(userId)
+			account = NewAccount(userId)
 			account.Users[userId] = NewAdminUser(userId)
 			err = am.Store.SaveAccount(account)
 			if err != nil {