diff options
Diffstat (limited to 'pkg/vpn/bonafide/gateways.go')
| -rw-r--r-- | pkg/vpn/bonafide/gateways.go | 42 |
1 files changed, 31 insertions, 11 deletions
diff --git a/pkg/vpn/bonafide/gateways.go b/pkg/vpn/bonafide/gateways.go index 6bfef7c..33ef578 100644 --- a/pkg/vpn/bonafide/gateways.go +++ b/pkg/vpn/bonafide/gateways.go @@ -13,8 +13,17 @@ const ( maxGateways = 3 ) +// Load reflects the fullness metric that menshen returns, if available. +type Load struct { + Host string + Fullness string +} + // A Gateway is a representation of gateways that is independent of the api version. -// If a given physical location offers different transports, they will appear as separate gateways. +// If a given physical location offers different transports, they will appear +// as separate gateways, so make sure to filter them. +// TODO We should include also the fullness metric here, so that it's easier to the UI to +// represent them without any extra call. type Gateway struct { Host string IPAddress string @@ -25,12 +34,7 @@ type Gateway struct { Protocols []string Options map[string]string Transport string -} - -// Load reflects the fullness metric that menshen returns, if available. -type Load struct { - Host string - Fullness string + Fullness float32 } /* gatewayDistance is used in the timezone distance fallback */ @@ -40,9 +44,13 @@ type gatewayDistance struct { } type gatewayPool struct { + /* available is the unordered list of gateways from eip-service, we use if as source-of-truth for now. + TODO we might want to remove gateways if they are not returned by menshen due to being overloaded */ available []Gateway userChoice []byte - byCity map[string][]string + + /* byCity is a map from location to an array of hostnames */ + byCity map[string][]string /* recommended is an array of hostnames, fetched from the old geoip service. * this should be deprecated in favor of recommendedWithLoad when new menshen is deployed */ @@ -83,7 +91,7 @@ func (p *gatewayPool) isValidCity(city string) bool { return valid } -/* returns a map of city: hostname for the ui to use */ +/* returns a map of city: gateway for the ui to use */ func (p *gatewayPool) pickGatewayForCities(transport string) map[string]Gateway { cities := p.getCities() cm := make(map[string]Gateway) @@ -94,7 +102,10 @@ func (p *gatewayPool) pickGatewayForCities(transport string) map[string]Gateway return cm } -/* this method should only be used if we have no usable menshen list */ +/* this method should only be used if we have no usable menshen list. +* TODO if we do have an usable menshen list, we can just traverse "recommended" +* and return, in order, at most max gateways for the selected location. + */ func (p *gatewayPool) getRandomGatewayByCity(city, transport string) (Gateway, error) { if !p.isValidCity(city) { return Gateway{}, errors.New("bonafide: BUG not a valid city: " + city) @@ -114,6 +125,7 @@ func (p *gatewayPool) getRandomGatewayByCity(city, transport string) (Gateway, e return Gateway{}, errors.New("bonafide: BUG could not find any gateway for that location") } +/* used when we select a hostname in the ui and we want to know the gateway details */ func (p *gatewayPool) getGatewayByHost(host string) (Gateway, error) { for _, gw := range p.available { if gw.Host == host { @@ -123,6 +135,7 @@ func (p *gatewayPool) getGatewayByHost(host string) (Gateway, error) { return Gateway{}, errors.New("bonafide: not a valid host name") } +/* used when we want to know gateway details after we know what IP openvpn has connected to */ func (p *gatewayPool) getGatewayByIP(ip string) (Gateway, error) { for _, gw := range p.available { if gw.IPAddress == ip { @@ -132,10 +145,12 @@ func (p *gatewayPool) getGatewayByIP(ip string) (Gateway, error) { return Gateway{}, errors.New("bonafide: not a valid ip address") } +/* this perhaps could be made more explicit */ func (p *gatewayPool) setAutomaticChoice() { p.userChoice = []byte("") } +/* set a user manual override for gateway location */ func (p *gatewayPool) setUserChoice(city []byte) error { if !p.isValidCity(string(city)) { return errors.New("bonafide: not a valid city for gateway choice") @@ -144,6 +159,7 @@ func (p *gatewayPool) setUserChoice(city []byte) error { return nil } +/* set the recommended field from an ordered array. needs to be modified if menshen passed an array of Loads */ func (p *gatewayPool) setRecommendedGateways(hostnames []string) { hosts := make([]string, 0) for _, gw := range p.available { @@ -160,11 +176,13 @@ func (p *gatewayPool) setRecommendedGateways(hostnames []string) { p.recommended = hostnames } +/* get at most max gateways. the method of picking depends on whether we're +* doing manual override, and if we got useful info from menshen */ func (p *gatewayPool) getBest(transport string, tz, max int) ([]Gateway, error) { gws := make([]Gateway, 0) if len(p.userChoice) != 0 { /* FIXME this is random because we still do not get menshen to return us load. after "new" menshen is deployed, - we can just get them by the order menshen reeturned */ + we can just get them by the order menshen returned */ gw, err := p.getRandomGatewayByCity(string(p.userChoice), transport) gws = append(gws, gw) return gws, err @@ -183,6 +201,7 @@ func (p *gatewayPool) getAll(transport string, tz int) ([]Gateway, error) { } } +/* picks at most max gateways, filtering by transport, from the ordered list menshen returned */ func (p *gatewayPool) getGatewaysFromMenshen(transport string, max int) ([]Gateway, error) { gws := make([]Gateway, 0) for _, host := range p.recommended { @@ -202,6 +221,7 @@ end: return gws, nil } +/* the old timezone based heuristic, when everything goes wrong */ func (p *gatewayPool) getGatewaysByTimezone(transport string, tzOffsetHours, max int) ([]Gateway, error) { gws := make([]Gateway, 0) gwVector := []gatewayDistance{} |