AppStats: Connection Duration Addition to API

CHANGELOG.md

@@ -32,6 +32,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - added transport_setup_nodes field to transport section
 - added MinHops field to V1Routing section of config
 - added `skywire-cli config` subcommand
+- added connection_duration field to `/api/visor/{pk}/apps/vpn-client/connections`
 
 ## 0.2.1 - 2020.04.07
 

internal/vpn/client.go

@@ -10,6 +10,7 @@ import (
 	"runtime"
 	"strconv"
 	"sync"
+	"sync/atomic"
 	"time"
 
 	"github.com/sirupsen/logrus"
@@ -52,6 +53,8 @@ type Client struct {
 	tunMu      sync.Mutex
 	tun        TUNDevice
 	tunCreated bool
+
+	connectedDuration int64
 }
 
 // NewClient creates VPN client instance.
@@ -176,10 +179,13 @@ func (c *Client) Serve() error {
 			fmt.Printf("Failed to close TUN: %v\n", err)
 		}
 
-		fmt.Println("Closed TUN")
+		c.log.Info("Closing TUN")
 	}()
 
-	defer c.setAppStatus(ClientStatusShuttingDown)
+	defer func() {
+		c.setAppStatus(ClientStatusShuttingDown)
+		c.resetConnDuration()
+	}()
 
 	c.setAppStatus(ClientStatusConnecting)
 
@@ -205,8 +211,10 @@ func (c *Client) Serve() error {
 			case errHandshakeStatusForbidden, errHandshakeStatusInternalError, errHandshakeNoFreeIPs,
 				errHandshakeStatusBadRequest, errNoTransportFound, errTransportNotFound:
 				c.setAppError(err)
+				c.resetConnDuration()
 				return err
 			default:
+				c.resetConnDuration()
 				c.setAppStatus(ClientStatusReconnecting)
 				c.setAppError(errTimeout)
 				fmt.Println("\nConnection broke, reconnecting...")
@@ -252,6 +260,17 @@ func (c *Client) AddDirectRoute(ip net.IP) error {
 	return c.setupDirectRoute(ip)
 }
 
+func (c *Client) removeDirectRouteFn(ip net.IP, i int) error {
+	c.directIPs = append(c.directIPs[:i], c.directIPs[i+1:]...)
+
+	if err := c.setSysPrivileges(); err != nil {
+		return fmt.Errorf("failed to setup system privileges: %w", err)
+	}
+	defer c.releaseSysPrivileges()
+
+	return c.removeDirectRoute(ip)
+}
+
 // RemoveDirectRoute removes direct route. Packets destined to `ip` will
 // go through VPN.
 func (c *Client) RemoveDirectRoute(ip net.IP) error {
@@ -260,17 +279,9 @@ func (c *Client) RemoveDirectRoute(ip net.IP) error {
 
 	for i, storedIP := range c.directIPs {
 		if ip.Equal(storedIP) {
-			c.directIPs = append(c.directIPs[:i], c.directIPs[i+1:]...)
-
-			if err := c.setSysPrivileges(); err != nil {
-				return fmt.Errorf("failed to setup system privileges: %w", err)
-			}
-			defer c.releaseSysPrivileges()
-
-			if err := c.removeDirectRoute(ip); err != nil {
+			if err := c.removeDirectRouteFn(ip, i); err != nil {
 				return err
 			}
-
 			break
 		}
 	}
@@ -397,6 +408,8 @@ func (c *Client) serveConn(conn net.Conn) error {
 	}
 
 	c.setAppStatus(ClientStatusRunning)
+	c.resetConnDuration()
+	t := time.NewTicker(time.Second)
 
 	defer func() {
 		if !c.cfg.Killswitch {
@@ -427,10 +440,19 @@ func (c *Client) serveConn(conn net.Conn) error {
 	}()
 
 	// only one side may fail here, so we wait till at least one fails
-	select {
-	case <-connToTunDoneCh:
-	case <-tunToConnCh:
-	case <-c.closeC:
+serveLoop:
+	for {
+		select {
+		case <-connToTunDoneCh:
+			break serveLoop
+		case <-tunToConnCh:
+			break serveLoop
+		case <-c.closeC:
+			break serveLoop
+		case <-t.C:
+			atomic.AddInt64(&c.connectedDuration, 1)
+			c.setConnectionDuration()
+		}
 	}
 
 	// here we setup system privileges again, so deferred calls may be done safely
@@ -727,6 +749,12 @@ func (c *Client) setAppStatus(status ClientStatus) {
 	}
 }
 
+func (c *Client) setConnectionDuration() {
+	if err := c.appCl.SetConnectionDuration(atomic.LoadInt64(&c.connectedDuration)); err != nil {
+		fmt.Printf("Failed to set connection duration: %v\n", err)
+	}
+}
+
 func (c *Client) setAppError(appErr error) {
 	if err := c.appCl.SetError(appErr.Error()); err != nil {
 		fmt.Printf("Failed to set error %v: %v\n", appErr, err)
@@ -743,6 +771,11 @@ func (c *Client) isClosed() bool {
 	return false
 }
 
+func (c *Client) resetConnDuration() {
+	atomic.StoreInt64(&c.connectedDuration, 0)
+	c.setConnectionDuration()
+}
+
 func ipFromEnv(key string) (net.IP, error) {
 	ip, ok, err := IPFromEnv(key)
 	if err != nil {

pkg/app/appserver/proc.go

@@ -53,8 +53,12 @@ type Proc struct {
 
 	statusMx sync.RWMutex
 	status   string
-	errMx    sync.RWMutex
-	err      string
+	// connection duration (i.e. when vpn client is connected, the app will set the connection duration)
+	connDuration   int64
+	connDurationMu sync.RWMutex
+
+	errMx sync.RWMutex
+	err   string
 }
 
 // NewProc constructs `Proc`.
@@ -280,6 +284,20 @@ func (p *Proc) SetDetailedStatus(status string) {
 	p.status = status
 }
 
+// SetConnectionDuration sets the proc's connection duration
+func (p *Proc) SetConnectionDuration(dur int64) {
+	p.connDurationMu.Lock()
+	defer p.connDurationMu.Unlock()
+	p.connDuration = dur
+}
+
+// ConnectionDuration gets proc's connection duration
+func (p *Proc) ConnectionDuration() int64 {
+	p.connDurationMu.RLock()
+	defer p.connDurationMu.RUnlock()
+	return p.connDuration
+}
+
 // DetailedStatus gets proc's detailed status.
 func (p *Proc) DetailedStatus() string {
 	p.statusMx.RLock()
@@ -306,13 +324,14 @@ func (p *Proc) Error() string {
 
 // ConnectionSummary sums up the connection stats.
 type ConnectionSummary struct {
-	IsAlive           bool          `json:"is_alive"`
-	Latency           time.Duration `json:"latency"`
-	UploadSpeed       uint32        `json:"upload_speed"`
-	DownloadSpeed     uint32        `json:"download_speed"`
-	BandwidthSent     uint64        `json:"bandwidth_sent"`
-	BandwidthReceived uint64        `json:"bandwidth_received"`
-	Error             string        `json:"error"`
+	IsAlive            bool          `json:"is_alive"`
+	Latency            time.Duration `json:"latency"`
+	UploadSpeed        uint32        `json:"upload_speed"`
+	DownloadSpeed      uint32        `json:"download_speed"`
+	BandwidthSent      uint64        `json:"bandwidth_sent"`
+	BandwidthReceived  uint64        `json:"bandwidth_received"`
+	Error              string        `json:"error"`
+	ConnectionDuration int64         `json:"connection_duration,omitempty"`
 }
 
 // ConnectionsSummary returns all of the proc's connections stats.
@@ -348,12 +367,13 @@ func (p *Proc) ConnectionsSummary() []ConnectionSummary {
 		}
 
 		summaries = append(summaries, ConnectionSummary{
-			IsAlive:           skywireConn.IsAlive(),
-			Latency:           skywireConn.Latency(),
-			UploadSpeed:       skywireConn.UploadSpeed(),
-			DownloadSpeed:     skywireConn.DownloadSpeed(),
-			BandwidthSent:     skywireConn.BandwidthSent(),
-			BandwidthReceived: skywireConn.BandwidthReceived(),
+			IsAlive:            skywireConn.IsAlive(),
+			Latency:            skywireConn.Latency(),
+			UploadSpeed:        skywireConn.UploadSpeed(),
+			DownloadSpeed:      skywireConn.DownloadSpeed(),
+			BandwidthSent:      skywireConn.BandwidthSent(),
+			BandwidthReceived:  skywireConn.BandwidthReceived(),
+			ConnectionDuration: p.ConnectionDuration(),
 		})
 
 		return true

pkg/app/appserver/rpc_ingress_client.go

@@ -15,6 +15,7 @@ import (
 // RPCIngressClient describes RPC interface to communicate with the server.
 type RPCIngressClient interface {
 	SetDetailedStatus(status string) error
+	SetConnectionDuration(dur int64) error
 	SetError(appErr string) error
 	Dial(remote appnet.Addr) (connID uint16, localPort routing.Port, err error)
 	Listen(local appnet.Addr) (uint16, error)
@@ -47,6 +48,11 @@ func (c *rpcIngressClient) SetDetailedStatus(status string) error {
 	return c.rpc.Call(c.formatMethod("SetDetailedStatus"), &status, nil)
 }
 
+// SetConnectionDuration sets the connection duration for an app
+func (c *rpcIngressClient) SetConnectionDuration(dur int64) error {
+	return c.rpc.Call(c.formatMethod("SetConnectionDuration"), dur, nil)
+}
+
 // SetError sets error of an app.
 func (c *rpcIngressClient) SetError(appErr string) error {
 	return c.rpc.Call(c.formatMethod("SetError"), &appErr, nil)

pkg/app/appserver/rpc_ingress_gateway.go

@@ -85,12 +85,17 @@ func (r *RPCIngressGateway) SetDetailedStatus(status *string, _ *struct{}) (err
 	return nil
 }
 
+// SetConnectionDuration sets the connection duration of an app (vpn-client in this instance)
+func (r *RPCIngressGateway) SetConnectionDuration(dur int64, _ *struct{}) (err error) {
+	defer rpcutil.LogCall(r.log, "SetConnectionDuration", dur)(nil, &err)
+	r.proc.SetConnectionDuration(dur)
+	return nil
+}
+
 // SetError sets error of an app.
 func (r *RPCIngressGateway) SetError(appErr *string, _ *struct{}) (err error) {
 	defer rpcutil.LogCall(r.log, "SetError", appErr)(nil, &err)
-
 	r.proc.SetError(*appErr)
-
 	return nil
 }
 

pkg/app/client.go

@@ -68,6 +68,11 @@ func (c *Client) SetDetailedStatus(status string) error {
 	return c.rpcC.SetDetailedStatus(status)
 }
 
+// SetConnectionDuration sets the detailed app connection duration within the visor.
+func (c *Client) SetConnectionDuration(dur int64) error {
+	return c.rpcC.SetConnectionDuration(dur)
+}
+
 // SetError sets app error within the visor.
 func (c *Client) SetError(appErr string) error {
 	return c.rpcC.SetError(appErr)

pkg/app/launcher/launcher.go

@@ -196,7 +196,10 @@ func (l *Launcher) AppStates() []*AppState {
 		}
 		if proc, ok := l.procM.ProcByName(app.Name); ok {
 			state.DetailedStatus = proc.DetailedStatus()
-			state.Status = AppStatusRunning
+			connSummary := proc.ConnectionsSummary()
+			if connSummary != nil {
+				state.Status = AppStatusRunning
+			}
 		}
 		states = append(states, state)
 	}