Feature/ephemeral peers (#1100)

The ephemeral manager keep the inactive ephemeral peers in a linked list. The manager schedule a cleanup procedure to the head of the linked list (to the most deprecated peer). At the end of cleanup schedule the next cleanup to the new head.
If a device connect back to the server the manager will remote it from the peers list.

management/server/ephemeral_test.go

@@ -0,0 +1,142 @@
+package server
+
+import (
+	"fmt"
+	"testing"
+	"time"
+)
+
+type MockStore struct {
+	Store
+	account *Account
+}
+
+func (s *MockStore) GetAllAccounts() []*Account {
+	return []*Account{s.account}
+}
+
+func (s *MockStore) GetAccountByPeerID(peerId string) (*Account, error) {
+	_, ok := s.account.Peers[peerId]
+	if ok {
+		return s.account, nil
+	}
+
+	return nil, fmt.Errorf("account not found")
+}
+
+type MocAccountManager struct {
+	AccountManager
+	store *MockStore
+}
+
+func (a MocAccountManager) DeletePeer(accountID, peerID, userID string) (*Peer, error) {
+	delete(a.store.account.Peers, peerID)
+	return nil, nil
+}
+
+func TestNewManager(t *testing.T) {
+	startTime := time.Now()
+	timeNow = func() time.Time {
+		return startTime
+	}
+
+	store := &MockStore{}
+	am := MocAccountManager{
+		store: store,
+	}
+
+	numberOfPeers := 5
+	numberOfEphemeralPeers := 3
+	seedPeers(store, numberOfPeers, numberOfEphemeralPeers)
+
+	mgr := NewEphemeralManager(store, am)
+	mgr.loadEphemeralPeers()
+	startTime = startTime.Add(ephemeralLifeTime + 1)
+	mgr.cleanup()
+
+	if len(store.account.Peers) != numberOfPeers {
+		t.Errorf("failed to cleanup ephemeral peers, expected: %d, result: %d", numberOfPeers, len(store.account.Peers))
+	}
+}
+
+func TestNewManagerPeerConnected(t *testing.T) {
+	startTime := time.Now()
+	timeNow = func() time.Time {
+		return startTime
+	}
+
+	store := &MockStore{}
+	am := MocAccountManager{
+		store: store,
+	}
+
+	numberOfPeers := 5
+	numberOfEphemeralPeers := 3
+	seedPeers(store, numberOfPeers, numberOfEphemeralPeers)
+
+	mgr := NewEphemeralManager(store, am)
+	mgr.loadEphemeralPeers()
+	mgr.OnPeerConnected(store.account.Peers["ephemeral_peer_0"])
+
+	startTime = startTime.Add(ephemeralLifeTime + 1)
+	mgr.cleanup()
+
+	expected := numberOfPeers + 1
+	if len(store.account.Peers) != expected {
+		t.Errorf("failed to cleanup ephemeral peers, expected: %d, result: %d", expected, len(store.account.Peers))
+	}
+}
+
+func TestNewManagerPeerDisconnected(t *testing.T) {
+	startTime := time.Now()
+	timeNow = func() time.Time {
+		return startTime
+	}
+
+	store := &MockStore{}
+	am := MocAccountManager{
+		store: store,
+	}
+
+	numberOfPeers := 5
+	numberOfEphemeralPeers := 3
+	seedPeers(store, numberOfPeers, numberOfEphemeralPeers)
+
+	mgr := NewEphemeralManager(store, am)
+	mgr.loadEphemeralPeers()
+	for _, v := range store.account.Peers {
+		mgr.OnPeerConnected(v)
+
+	}
+	mgr.OnPeerDisconnected(store.account.Peers["ephemeral_peer_0"])
+
+	startTime = startTime.Add(ephemeralLifeTime + 1)
+	mgr.cleanup()
+
+	expected := numberOfPeers + numberOfEphemeralPeers - 1
+	if len(store.account.Peers) != expected {
+		t.Errorf("failed to cleanup ephemeral peers, expected: %d, result: %d", expected, len(store.account.Peers))
+	}
+}
+
+func seedPeers(store *MockStore, numberOfPeers int, numberOfEphemeralPeers int) {
+	store.account = newAccountWithId("my account", "", "")
+
+	for i := 0; i < numberOfPeers; i++ {
+		peerId := fmt.Sprintf("peer_%d", i)
+		p := &Peer{
+			ID:        peerId,
+			Ephemeral: false,
+		}
+		store.account.Peers[p.ID] = p
+	}
+
+	for i := 0; i < numberOfEphemeralPeers; i++ {
+		peerId := fmt.Sprintf("ephemeral_peer_%d", i)
+		p := &Peer{
+			ID:        peerId,
+			Ephemeral: true,
+		}
+		store.account.Peers[p.ID] = p
+	}
+}