core: Send contact update events on status change

backend/rpc.go

@@ -6,7 +6,6 @@ import (
 	rpc "github.com/special/notricochet/rpc"
 	"golang.org/x/net/context"
 	"log"
-	"time"
 )
 
 var NotImplementedError error = errors.New("Not implemented")
@@ -85,17 +84,10 @@ func (s *RpcServer) MonitorContacts(req *rpc.MonitorContactsRequest, stream rpc.
 	// Populate
 	contacts := s.core.Identity.ContactList().Contacts()
 	for _, contact := range contacts {
-		data := &rpc.Contact{
-			Id:            int32(contact.Id()),
-			Address:       contact.Address(),
-			Nickname:      contact.Nickname(),
-			WhenCreated:   contact.WhenCreated().Format(time.RFC3339),
-			LastConnected: contact.LastConnected().Format(time.RFC3339),
-		}
 		event := &rpc.ContactEvent{
 			Type: rpc.ContactEvent_POPULATE,
 			Subject: &rpc.ContactEvent_Contact{
-				Contact: data,
+				Contact: contact.Data(),
 			},
 		}
 		if err := stream.Send(event); err != nil {

core/contact.go

@@ -3,8 +3,10 @@ package core
 import (
 	"fmt"
 	protocol "github.com/s-rah/go-ricochet"
+	"github.com/special/notricochet/core/utils"
 	"github.com/special/notricochet/rpc"
 	"log"
+	"strconv"
 	"strings"
 	"sync"
 	"time"
@@ -14,18 +16,24 @@ import (
 // Contact, ConfigContact, and rpc.Contact. This should be reduced somehow.
 
 type Contact struct {
-	id   int
-	data ConfigContact
+	core *Ricochet
 
-	mutex sync.Mutex
+	id     int
+	data   ConfigContact
+	status ricochet.Contact_Status
+
+	mutex  sync.Mutex
+	events *utils.Publisher
 
 	connection *protocol.OpenConnection
 }
 
-func ContactFromConfig(id int, data ConfigContact) (*Contact, error) {
+func ContactFromConfig(core *Ricochet, id int, data ConfigContact, events *utils.Publisher) (*Contact, error) {
 	contact := &Contact{
-		id:   id,
-		data: data,
+		core:   core,
+		id:     id,
+		data:   data,
+		events: events,
 	}
 
 	if id < 0 {
@@ -76,56 +84,50 @@ func (c *Contact) WhenCreated() time.Time {
 func (c *Contact) Status() ricochet.Contact_Status {
 	c.mutex.Lock()
 	defer c.mutex.Unlock()
-	if c.connection == nil {
-		return ricochet.Contact_UNKNOWN
-	} else {
-		return ricochet.Contact_ONLINE
+	return c.status
+}
+
+func (c *Contact) Data() *ricochet.Contact {
+	c.mutex.Lock()
+	defer c.mutex.Unlock()
+	data := &ricochet.Contact{
+		Id:            int32(c.id),
+		Address:       "ricochet:" + c.data.Hostname[0:16],
+		Nickname:      c.data.Nickname,
+		WhenCreated:   c.data.WhenCreated,
+		LastConnected: c.data.LastConnected,
+		Status:        c.status,
 	}
+	return data
 }
 
 func (c *Contact) SetConnection(conn *protocol.OpenConnection) error {
 	c.mutex.Lock()
-	defer c.mutex.Unlock()
 
 	if conn == c.connection {
+		c.mutex.Unlock()
 		return fmt.Errorf("Duplicate assignment of connection %v to contact %v", conn, c)
 	}
 
 	if !conn.IsAuthed || conn.Closed {
+		c.mutex.Unlock()
+		conn.Close()
 		return fmt.Errorf("Connection %v is not in a valid state to assign to contact %v", conn, c)
 	}
 
 	if c.data.Hostname[0:16] != conn.OtherHostname {
+		c.mutex.Unlock()
+		conn.Close()
 		return fmt.Errorf("Connection hostname %s doesn't match contact hostname %s when assigning connection", conn.OtherHostname, c.data.Hostname[0:16])
 	}
 
-	if c.connection != nil && c.connection.Closed {
-		log.Printf("Replacing dead connection %v for contact %v", c.connection, c)
-		c.connection = nil
-	}
-
-	// Decide whether to replace an existing connection with this one
 	if c.connection != nil {
-		// If the existing connection is in the same direction, always use the new one
-		if c.connection.Client == conn.Client {
-			log.Printf("Replacing existing same-direction connection %v with new connection %v for contact %v", c.connection, conn, c)
-			c.connection.Close()
-			c.connection = nil
-		}
-
-		// If the existing connection is more than 30 seconds old, use the new one
-		// XXX implement this
-
-		// Fall back to string comparison of hostnames for a stable resolution
-		preferOutbound := conn.MyHostname < conn.OtherHostname
-		if preferOutbound == conn.Client {
-			// New connection wins
-			log.Printf("Replacing existing connection %v with new connection %v for contact %v according to fallback order", c.connection, conn, c)
+		if c.shouldReplaceConnection(conn) {
+			// XXX Signal state change for connection loss?
 			c.connection.Close()
 			c.connection = nil
 		} else {
-			// Old connection wins
-			log.Printf("Keeping existing connection %v instead of new connection %v for contact %v according to fallback order", c.connection, conn, c)
+			c.mutex.Unlock()
 			conn.Close()
 			return fmt.Errorf("Using existing connection")
 		}
@@ -136,13 +138,56 @@ func (c *Contact) SetConnection(conn *protocol.OpenConnection) error {
 	// if the outbound connection will lose the fallback comparison above.
 	// XXX implement this
 
+	// XXX react to connection state changes
 	c.connection = conn
+	c.status = ricochet.Contact_ONLINE
 	log.Printf("Assigned connection %v to contact %v", c.connection, c)
 
 	// XXX implicit accept contact requests
-	// XXX update connected date
-	// XXX signal state and data changes
-	// XXX react to connection state changes
+
+	// Update LastConnected time
+	config := c.core.Config.OpenWrite()
+	c.data.LastConnected = time.Now().Format(time.RFC3339)
+	config.Contacts[strconv.Itoa(c.id)] = c.data
+	config.Save()
+
+	c.mutex.Unlock()
+
+	event := ricochet.ContactEvent{
+		Type: ricochet.ContactEvent_UPDATE,
+		Subject: &ricochet.ContactEvent_Contact{
+			Contact: c.Data(),
+		},
+	}
+	c.events.Publish(event)
 
 	return nil
 }
+
+// Decide whether to replace the existing connection with conn.
+// Assumes mutex is held.
+func (c *Contact) shouldReplaceConnection(conn *protocol.OpenConnection) bool {
+	if c.connection == nil {
+		return true
+	} else if c.connection.Closed {
+		log.Printf("Replacing dead connection %v for contact %v", c.connection, c)
+		return true
+	} else if c.connection.Client == conn.Client {
+		// If the existing connection is in the same direction, always use the new one
+		log.Printf("Replacing existing same-direction connection %v with new connection %v for contact %v", c.connection, conn, c)
+		return true
+	} else if false {
+		// If the existing connection is more than 30 seconds old, use the new one
+		// XXX implement this
+	} else if preferOutbound := conn.MyHostname < conn.OtherHostname; preferOutbound == conn.Client {
+		// Fall back to string comparison of hostnames for a stable resolution
+		// New connection wins
+		log.Printf("Replacing existing connection %v with new connection %v for contact %v according to fallback order", c.connection, conn, c)
+		return true
+	} else {
+		// Old connection wins fallback
+		log.Printf("Keeping existing connection %v instead of new connection %v for contact %v according to fallback order", c.connection, conn, c)
+		return false
+	}
+	return false
+}

core/contactlist.go

@@ -36,7 +36,7 @@ func LoadContactList(core *Ricochet) (*ContactList, error) {
 			return nil, fmt.Errorf("Duplicate contact id '%d'", id)
 		}
 
-		contact, err := ContactFromConfig(id, data)
+		contact, err := ContactFromConfig(core, id, data, list.events)
 		if err != nil {
 			return nil, err
 		}