Implemented support to query the live neighbor status from the store

via uncached queries.

backend/api/response_neighbors.go

@@ -52,3 +52,30 @@ func (self *NeighboursResponse) CacheTtl() time.Duration {
 }
 
 type NeighboursLookupResults map[string]Neighbours
+
+
+type NeighboursStatus []*NeighbourStatus
+
+type NeighbourStatus struct {
+	Id    string        `json:"id"`
+	State string        `json:"state"`
+	Since time.Duration `json:"uptime"`
+}
+
+// Implement sorting interface for status
+func (neighbours NeighboursStatus) Len() int {
+	return len(neighbours)
+}
+
+func (neighbours NeighboursStatus) Less(i, j int) bool {
+	return neighbours[i].Id < neighbours[j].Id
+}
+
+func (neighbours NeighboursStatus) Swap(i, j int) {
+	neighbours[i], neighbours[j] = neighbours[j], neighbours[i]
+}
+
+type NeighboursStatusResponse struct {
+	Api        ApiStatus        `json:"api"`
+	Neighbours NeighboursStatus `json:"neighbours"`
+}

backend/config.go

@@ -21,6 +21,7 @@ type ServerConfig struct {
 	NeighboursStoreRefreshInterval int    `ini:"neighbours_store_refresh_interval"`
 	RoutesStoreRefreshInterval     int    `ini:"routes_store_refresh_interval"`
 	Asn                            int    `ini:"asn"`
+	EnableNeighborsStatusRefresh   bool   `ini:"enable_neighbors_status_refresh"`
 }
 
 type HousekeepingConfig struct {

backend/neighbours_store.go

@@ -15,10 +15,11 @@ var REGEX_MATCH_ASLOOKUP = regexp.MustCompile(`(?i)^AS(\d+)`)
 type NeighboursIndex map[string]*api.Neighbour
 
 type NeighboursStore struct {
-	neighboursMap   map[string]NeighboursIndex
-	configMap       map[string]*SourceConfig
-	statusMap       map[string]StoreStatus
-	refreshInterval time.Duration
+	neighboursMap         map[string]NeighboursIndex
+	configMap             map[string]*SourceConfig
+	statusMap             map[string]StoreStatus
+	refreshInterval       time.Duration
+	refreshNeighborStatus bool
 
 	sync.RWMutex
 }
@@ -48,11 +49,14 @@ func NewNeighboursStore(config *Config) *NeighboursStore {
 		refreshInterval = time.Duration(5) * time.Minute
 	}
 
+	refreshNeighborStatus := config.Server.EnableNeighborsStatusRefresh
+
 	store := &NeighboursStore{
 		neighboursMap:   neighboursMap,
 		statusMap:       statusMap,
 		configMap:       configMap,
 		refreshInterval: refreshInterval,
+		refreshNeighborStatus: refreshNeighborStatus,
 	}
 	return store
 }
@@ -165,9 +169,32 @@ func (self *NeighboursStore) GetNeighborsAt(sourceId string) api.Neighbours {
 	neighborsIdx := self.neighboursMap[sourceId]
 	self.RUnlock()
 
+	var neighborsStatus map[string]api.NeighbourStatus
+	if self.refreshNeighborStatus {
+		sourceConfig := self.configMap[sourceId]
+		source := sourceConfig.getInstance()
+
+		neighborsStatusData, err := source.NeighboursStatus()
+		if err == nil {
+			neighborsStatus = make(map[string]api.NeighbourStatus, len(neighborsStatusData.Neighbours))
+
+			for _, neighbor := range neighborsStatusData.Neighbours {
+				neighborsStatus[neighbor.Id] = *neighbor
+			}
+		}
+	}
+
 	neighbors := make(api.Neighbours, 0, len(neighborsIdx))
 
 	for _, neighbor := range neighborsIdx {
+		if self.refreshNeighborStatus {
+			if _, ok := neighborsStatus[neighbor.Id]; ok {
+				self.Lock()
+				neighbor.State = neighborsStatus[neighbor.Id].State
+				self.Unlock()
+			}
+		}
+
 		neighbors = append(neighbors, neighbor)
 	}
 

backend/sources/birdwatcher/client.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"io/ioutil"
 	"net/http"
+	"time"
 )
 
 type ClientResponse map[string]interface{}
@@ -22,8 +23,8 @@ func NewClient(api string) *Client {
 }
 
 // Make API request, parse response and return map or error
-func (self *Client) GetJson(endpoint string) (ClientResponse, error) {
-	res, err := http.Get(self.Api + endpoint)
+func (self *Client) Get(client *http.Client, url string) (ClientResponse, error) {
+	res, err := client.Get(url)
 	if err != nil {
 		return ClientResponse{}, err
 	}
@@ -44,3 +45,19 @@ func (self *Client) GetJson(endpoint string) (ClientResponse, error) {
 
 	return result, nil
 }
+
+// Make API request, parse response and return map or error
+func (self *Client) GetJson(endpoint string) (ClientResponse, error) {
+	client := &http.Client{}
+
+	return self.Get(client, self.Api + endpoint)
+}
+
+// Make API request, parse response and return map or error
+func (self *Client) GetJsonTimeout(timeout time.Duration, endpoint string) (ClientResponse, error) {
+	client := &http.Client{
+		Timeout: timeout,
+	}
+
+	return self.Get(client, self.Api + endpoint)
+}

backend/sources/birdwatcher/config.go

@@ -11,7 +11,8 @@ type Config struct {
 	ServerTimeExt   string `ini:"servertime_ext"`
 	ShowLastReboot  bool   `ini:"show_last_reboot"`
 
-	Type               string `ini:"type"`
-	PeerTablePrefix    string `ini:"peer_table_prefix"`
-	PipeProtocolPrefix string `ini:"pipe_protocol_prefix"`
+	Type                    string `ini:"type"`
+	PeerTablePrefix         string `ini:"peer_table_prefix"`
+	PipeProtocolPrefix      string `ini:"pipe_protocol_prefix"`
+	NeighborsRefreshTimeout int    `ini:"neighbors_refresh_timeout"`
 }

backend/sources/birdwatcher/parsers.go

@@ -200,6 +200,31 @@ func parseNeighbours(bird ClientResponse, config Config) (api.Neighbours, error)
 	return neighbours, nil
 }
 
+// Parse neighbours response
+func parseNeighboursShort(bird ClientResponse, config Config) (api.NeighboursStatus, error) {
+	neighbours := api.NeighboursStatus{}
+	protocols := bird["protocols"].(map[string]interface{})
+
+	// Iterate over protocols map:
+	for protocolId, proto := range protocols {
+		protocol := proto.(map[string]interface{})
+
+		uptime := parseRelativeServerTime(protocol["since"], config)
+
+		neighbour := &api.NeighbourStatus{
+			Id:          protocolId,
+			State:       mustString(protocol["state"], "unknown"),
+			Since:       uptime,
+		}
+
+		neighbours = append(neighbours, neighbour)
+	}
+
+	sort.Sort(neighbours)
+
+	return neighbours, nil
+}
+
 // Parse route bgp info
 func parseRouteBgpInfo(data interface{}) api.BgpInfo {
 	bgpData, ok := data.(map[string]interface{})

backend/sources/birdwatcher/source.go

@@ -5,7 +5,9 @@ import (
 	"github.com/alice-lg/alice-lg/backend/caches"
 	"github.com/alice-lg/alice-lg/backend/sources"
 
+	"fmt"
 	"sort"
+	"time"
 )
 
 type Birdwatcher interface {
@@ -145,6 +147,47 @@ func (self *GenericBirdwatcher) filterRoutesByDuplicates(routes api.Routes, filt
 	return routes
 }
 
+func (self *GenericBirdwatcher) filterRoutesByNeighborId(routes api.Routes, neighborId string) api.Routes {
+	result_routes := make(api.Routes, 0, len(routes))
+
+	// Choose routes with next_hop == gateway of this neighbour
+	for _, route := range routes {
+		if route.Details["from_protocol"] == neighborId {
+			result_routes = append(result_routes, route)
+		}
+	}
+
+	// Sort routes for deterministic ordering
+	sort.Sort(result_routes)
+	routes = result_routes
+
+	return routes
+}
+
+func (self *GenericBirdwatcher) fetchProtocolsShort() (*api.ApiStatus, map[string]interface{}, error) {
+	// Query birdwatcher
+	timeout := 2 * time.Second
+	if self.config.NeighborsRefreshTimeout > 0 {
+		timeout = time.Duration(self.config.NeighborsRefreshTimeout) * time.Second
+	}
+	bird, err := self.client.GetJsonTimeout(timeout, "/protocols/short?uncached=true")
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Use api status from first request
+	apiStatus, err := parseApiStatus(bird, self.config)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if _, ok := bird["protocols"]; !ok {
+		return nil, nil, fmt.Errorf("Failed to fetch protocols")
+	}
+
+	return &apiStatus, bird, nil
+}
+
 func (self *GenericBirdwatcher) ExpireCaches() int {
 	count := self.routesRequiredCache.Expire()
 	count += self.routesNotExportedCache.Expire()
@@ -179,6 +222,28 @@ func (self *GenericBirdwatcher) Status() (*api.StatusResponse, error) {
 	return response, nil
 }
 
+// Get live neighbor status
+func (self *GenericBirdwatcher) NeighboursStatus() (*api.NeighboursStatusResponse, error) {
+	// Query birdwatcher
+	apiStatus, birdProtocols, err := self.fetchProtocolsShort()
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the neighbors short
+	neighbours, err := parseNeighboursShort(birdProtocols, self.config)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &api.NeighboursStatusResponse{
+		Api:        *apiStatus,
+		Neighbours: neighbours,
+	}
+
+	return response, nil // dereference for now
+}
+
 // Make routes lookup
 func (self *GenericBirdwatcher) LookupPrefix(prefix string) (*api.RoutesLookupResponse, error) {
 	// Get RS info

backend/sources/source.go

@@ -8,6 +8,7 @@ type Source interface {
 	ExpireCaches() int
 	Status() (*api.StatusResponse, error)
 	Neighbours() (*api.NeighboursResponse, error)
+	NeighboursStatus() (*api.NeighboursStatusResponse, error)
 	Routes(neighbourId string) (*api.RoutesResponse, error)
 	RoutesReceived(neighbourId string) (*api.RoutesResponse, error)
 	RoutesFiltered(neighbourId string) (*api.RoutesResponse, error)

etc/alice-lg/alice.example.conf

@@ -5,8 +5,10 @@
 [server]
 # configures the built-in webserver and provides global application settings
 listen_http = 127.0.0.1:7340
-enable_prefix_lookup = true
 # enable the prefix-lookup endpoint / the global search feature
+enable_prefix_lookup = true
+# Try to refresh the neighbor status on every request to /neighbors
+enable_neighbors_status_refresh = false
 asn = 9033
 # this ASN is used as a fallback value in the RPKI feature and for route
 # filtering evaluation with large BGP communities
@@ -150,6 +152,8 @@ api = http://rs1.example.com:29184/
 type = multi_table
 peer_table_prefix = T
 pipe_protocol_prefix = M
+# Timeout in seconds to wait for the status data (only required if enable_neighbors_status_refresh is true)
+neighbors_refresh_timeout = 2
 
 # Optional:
 show_last_reboot = true
@@ -164,6 +168,8 @@ api = http://rs1.example.com:29186/
 type = multi_table
 peer_table_prefix = T
 pipe_protocol_prefix = M
+# Timeout in seconds to wait for the status data (only required if enable_neighbors_status_refresh is true)
+neighbors_refresh_timeout = 2
 
 # Optional: Examples for time format
 # Please see https://golang.org/pkg/time/#pkg-constants for an