commit 3c3317503eb8e83bbf5bebff411bbd722e60ee2f Author: Cecylia Bocovich cohosh@torproject.org Date: Wed Aug 19 11:37:43 2020 -0400
Update broker stats to include info on NAT types
As we now partition proxies by NAT type, our stats are more useful if they capture how many proxies of each type we have, and information on whether we have enough proxies of the right NAT type for our clients. This change adds proxy counts by NAT type and binned counts of denied clients by NAT type. --- broker/broker.go | 23 ++++++++++- broker/metrics.go | 53 +++++++++++++++++++------ broker/snowflake-broker_test.go | 88 +++++++++++++++++++++++++++++++++++++---- broker/snowflake-heap.go | 1 + doc/broker-spec.txt | 34 +++++++++++++++- 5 files changed, 177 insertions(+), 22 deletions(-)
diff --git a/broker/broker.go b/broker/broker.go index 99f6c69..983f95d 100644 --- a/broker/broker.go +++ b/broker/broker.go @@ -165,6 +165,7 @@ func (ctx *BrokerContext) AddSnowflake(id string, proxyType string, natType stri snowflake.id = id snowflake.clients = 0 snowflake.proxyType = proxyType + snowflake.natType = natType snowflake.offerChannel = make(chan *ClientOffer) snowflake.answerChannel = make(chan []byte) ctx.snowflakeLock.Lock() @@ -201,7 +202,7 @@ func proxyPolls(ctx *BrokerContext, w http.ResponseWriter, r *http.Request) { log.Println("Error processing proxy IP: ", err.Error()) } else { ctx.metrics.lock.Lock() - ctx.metrics.UpdateCountryStats(remoteIP, proxyType) + ctx.metrics.UpdateCountryStats(remoteIP, proxyType, natType) ctx.metrics.lock.Unlock() }
@@ -275,6 +276,11 @@ func clientOffers(ctx *BrokerContext, w http.ResponseWriter, r *http.Request) { if numSnowflakes <= 0 { ctx.metrics.lock.Lock() ctx.metrics.clientDeniedCount++ + if offer.natType == NATUnrestricted { + ctx.metrics.clientUnrestrictedDeniedCount++ + } else { + ctx.metrics.clientRestrictedDeniedCount++ + } ctx.metrics.lock.Unlock() w.WriteHeader(http.StatusServiceUnavailable) return @@ -357,6 +363,7 @@ func proxyAnswers(ctx *BrokerContext, w http.ResponseWriter, r *http.Request) { func debugHandler(ctx *BrokerContext, w http.ResponseWriter, r *http.Request) {
var webexts, browsers, standalones, unknowns int + var natRestricted, natUnrestricted, natUnknown int ctx.snowflakeLock.Lock() s := fmt.Sprintf("current snowflakes available: %d\n", len(ctx.idToSnowflake)) for _, snowflake := range ctx.idToSnowflake { @@ -370,12 +377,26 @@ func debugHandler(ctx *BrokerContext, w http.ResponseWriter, r *http.Request) { unknowns++ }
+ switch snowflake.natType { + case NATRestricted: + natRestricted++ + case NATUnrestricted: + natUnrestricted++ + default: + natUnknown++ + } + } ctx.snowflakeLock.Unlock() s += fmt.Sprintf("\tstandalone proxies: %d", standalones) s += fmt.Sprintf("\n\tbrowser proxies: %d", browsers) s += fmt.Sprintf("\n\twebext proxies: %d", webexts) s += fmt.Sprintf("\n\tunknown proxies: %d", unknowns) + + s += fmt.Sprintf("\nNAT Types available:") + s += fmt.Sprintf("\n\trestricted: %d", natRestricted) + s += fmt.Sprintf("\n\tunrestricted: %d", natUnrestricted) + s += fmt.Sprintf("\n\tunknown: %d", natUnknown) if _, err := w.Write([]byte(s)); err != nil { log.Printf("writing proxy information returned error: %v ", err) } diff --git a/broker/metrics.go b/broker/metrics.go index ea4d220..d1beae2 100644 --- a/broker/metrics.go +++ b/broker/metrics.go @@ -25,7 +25,12 @@ type CountryStats struct { badge map[string]bool webext map[string]bool unknown map[string]bool - counts map[string]int + + natRestricted map[string]bool + natUnrestricted map[string]bool + natUnknown map[string]bool + + counts map[string]int }
// Implements Observable @@ -34,11 +39,13 @@ type Metrics struct { tablev4 *GeoIPv4Table tablev6 *GeoIPv6Table
- countryStats CountryStats - clientRoundtripEstimate time.Duration - proxyIdleCount uint - clientDeniedCount uint - clientProxyMatchCount uint + countryStats CountryStats + clientRoundtripEstimate time.Duration + proxyIdleCount uint + clientDeniedCount uint + clientRestrictedDeniedCount uint + clientUnrestrictedDeniedCount uint + clientProxyMatchCount uint
//synchronization for access to snowflake metrics lock sync.Mutex @@ -58,7 +65,7 @@ func (s CountryStats) Display() string { return output }
-func (m *Metrics) UpdateCountryStats(addr string, proxyType string) { +func (m *Metrics) UpdateCountryStats(addr string, proxyType string, natType string) {
var country string var ok bool @@ -111,6 +118,15 @@ func (m *Metrics) UpdateCountryStats(addr string, proxyType string) { m.countryStats.unknown[addr] = true }
+ switch natType { + case NATRestricted: + m.countryStats.natRestricted[addr] = true + case NATUnrestricted: + m.countryStats.natUnrestricted[addr] = true + default: + m.countryStats.natUnknown[addr] = true + } + }
func (m *Metrics) LoadGeoipDatabases(geoipDB string, geoip6DB string) error { @@ -139,11 +155,14 @@ func NewMetrics(metricsLogger *log.Logger) (*Metrics, error) { m := new(Metrics)
m.countryStats = CountryStats{ - counts: make(map[string]int), - standalone: make(map[string]bool), - badge: make(map[string]bool), - webext: make(map[string]bool), - unknown: make(map[string]bool), + counts: make(map[string]int), + standalone: make(map[string]bool), + badge: make(map[string]bool), + webext: make(map[string]bool), + unknown: make(map[string]bool), + natRestricted: make(map[string]bool), + natUnrestricted: make(map[string]bool), + natUnknown: make(map[string]bool), }
m.logger = metricsLogger @@ -174,7 +193,12 @@ func (m *Metrics) printMetrics() { m.logger.Println("snowflake-ips-webext", len(m.countryStats.webext)) m.logger.Println("snowflake-idle-count", binCount(m.proxyIdleCount)) m.logger.Println("client-denied-count", binCount(m.clientDeniedCount)) + m.logger.Println("client-restricted-denied-count", binCount(m.clientRestrictedDeniedCount)) + m.logger.Println("client-unrestricted-denied-count", binCount(m.clientUnrestrictedDeniedCount)) m.logger.Println("client-snowflake-match-count", binCount(m.clientProxyMatchCount)) + m.logger.Println("snowflake-ips-nat-restricted", len(m.countryStats.natRestricted)) + m.logger.Println("snowflake-ips-nat-unrestricted", len(m.countryStats.natUnrestricted)) + m.logger.Println("snowflake-ips-nat-unknown", len(m.countryStats.natUnknown)) m.lock.Unlock() }
@@ -182,12 +206,17 @@ func (m *Metrics) printMetrics() { func (m *Metrics) zeroMetrics() { m.proxyIdleCount = 0 m.clientDeniedCount = 0 + m.clientRestrictedDeniedCount = 0 + m.clientUnrestrictedDeniedCount = 0 m.clientProxyMatchCount = 0 m.countryStats.counts = make(map[string]int) m.countryStats.standalone = make(map[string]bool) m.countryStats.badge = make(map[string]bool) m.countryStats.webext = make(map[string]bool) m.countryStats.unknown = make(map[string]bool) + m.countryStats.natRestricted = make(map[string]bool) + m.countryStats.natUnrestricted = make(map[string]bool) + m.countryStats.natUnknown = make(map[string]bool) }
// Rounds up a count to the nearest multiple of 8. diff --git a/broker/snowflake-broker_test.go b/broker/snowflake-broker_test.go index d03dca7..4e8e5f0 100644 --- a/broker/snowflake-broker_test.go +++ b/broker/snowflake-broker_test.go @@ -437,7 +437,7 @@ func TestGeoip(t *testing.T) { if err := ctx.metrics.LoadGeoipDatabases("invalid_filename", "invalid_filename6"); err != nil { log.Printf("loading geo ip databases returned error: %v", err) } - ctx.metrics.UpdateCountryStats("127.0.0.1", "") + ctx.metrics.UpdateCountryStats("127.0.0.1", "", NATUnknown) So(ctx.metrics.tablev4, ShouldEqual, nil)
}) @@ -507,7 +507,7 @@ func TestMetrics(t *testing.T) { p.offerChannel <- nil <-done ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips CA=4\nsnowflake-ips-total 4\nsnowflake-ips-standalone 1\nsnowflake-ips-badge 1\nsnowflake-ips-webext 1\nsnowflake-idle-count 8\nclient-denied-count 0\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips CA=4\nsnowflake-ips-total 4\nsnowflake-ips-standalone 1\nsnowflake-ips-badge 1\nsnowflake-ips-webext 1\nsnowflake-idle-count 8\nclient-denied-count 0\nclient-restricted-denied-count 0\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 0\nsnowflake-ips-nat-restricted 0\nsnowflake-ips-nat-unrestricted 0\nsnowflake-ips-nat-unknown 1\n")
})
@@ -521,13 +521,13 @@ func TestMetrics(t *testing.T) { clientOffers(ctx, w, r)
ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 8\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldContainSubstring, "client-denied-count 8\nclient-restricted-denied-count 8\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 0")
// Test reset buf.Reset() ctx.metrics.zeroMetrics() ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 0\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldContainSubstring, "snowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 0\nclient-restricted-denied-count 0\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 0\nsnowflake-ips-nat-restricted 0\nsnowflake-ips-nat-unrestricted 0\nsnowflake-ips-nat-unknown 0\n") }) //Test addition of client matches Convey("for client-proxy match", func() { @@ -548,7 +548,7 @@ func TestMetrics(t *testing.T) { <-done
ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 0\nclient-snowflake-match-count 8\n") + So(buf.String(), ShouldContainSubstring, "client-denied-count 0\nclient-restricted-denied-count 0\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 8") }) //Test rounding boundary Convey("binning boundary", func() { @@ -567,12 +567,12 @@ func TestMetrics(t *testing.T) { clientOffers(ctx, w, r)
ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 8\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldContainSubstring, "client-denied-count 8\nclient-restricted-denied-count 8\nclient-unrestricted-denied-count 0\n")
clientOffers(ctx, w, r) buf.Reset() ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips \nsnowflake-ips-total 0\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 0\nclient-denied-count 16\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldContainSubstring, "client-denied-count 16\nclient-restricted-denied-count 16\nclient-unrestricted-denied-count 0\n") })
//Test unique ip @@ -605,7 +605,79 @@ func TestMetrics(t *testing.T) { <-done
ctx.metrics.printMetrics() - So(buf.String(), ShouldResemble, "snowflake-stats-end "+time.Now().UTC().Format("2006-01-02 15:04:05")+" (86400 s)\nsnowflake-ips CA=1\nsnowflake-ips-total 1\nsnowflake-ips-standalone 0\nsnowflake-ips-badge 0\nsnowflake-ips-webext 0\nsnowflake-idle-count 8\nclient-denied-count 0\nclient-snowflake-match-count 0\n") + So(buf.String(), ShouldContainSubstring, "snowflake-ips CA=1\nsnowflake-ips-total 1") + }) + //Test NAT types + Convey("proxy counts by NAT type", func() { + w := httptest.NewRecorder() + data := bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"unknown","NAT":"restricted"}`)) + r, err := http.NewRequest("POST", "snowflake.broker/proxy", data) + r.RemoteAddr = "129.97.208.23:8888" //CA geoip + So(err, ShouldBeNil) + go func(ctx *BrokerContext) { + proxyPolls(ctx, w, r) + done <- true + }(ctx) + p := <-ctx.proxyPolls //manually unblock poll + p.offerChannel <- nil + <-done + + ctx.metrics.printMetrics() + So(buf.String(), ShouldContainSubstring, "snowflake-ips-nat-restricted 1\nsnowflake-ips-nat-unrestricted 0\nsnowflake-ips-nat-unknown 0") + + data = bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.2","Type":"unknown","NAT":"unrestricted"}`)) + r, err = http.NewRequest("POST", "snowflake.broker/proxy", data) + if err != nil { + log.Printf("unable to get NewRequest with error: %v", err) + } + r.RemoteAddr = "129.97.208.24:8888" //CA geoip + go func(ctx *BrokerContext) { + proxyPolls(ctx, w, r) + done <- true + }(ctx) + p = <-ctx.proxyPolls //manually unblock poll + p.offerChannel <- nil + <-done + + ctx.metrics.printMetrics() + So(buf.String(), ShouldContainSubstring, "snowflake-ips-nat-restricted 1\nsnowflake-ips-nat-unrestricted 1\nsnowflake-ips-nat-unknown 0") + }) + //Test client failures by NAT type + Convey("client failures by NAT type", func() { + w := httptest.NewRecorder() + data := bytes.NewReader([]byte("test")) + r, err := http.NewRequest("POST", "snowflake.broker/client", data) + r.Header.Set("Snowflake-NAT-TYPE", "restricted") + So(err, ShouldBeNil) + + clientOffers(ctx, w, r) + + ctx.metrics.printMetrics() + So(buf.String(), ShouldContainSubstring, "client-denied-count 8\nclient-restricted-denied-count 8\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 0") + + buf.Reset() + ctx.metrics.zeroMetrics() + + r, err = http.NewRequest("POST", "snowflake.broker/client", data) + r.Header.Set("Snowflake-NAT-TYPE", "unrestricted") + So(err, ShouldBeNil) + + clientOffers(ctx, w, r) + + ctx.metrics.printMetrics() + So(buf.String(), ShouldContainSubstring, "client-denied-count 8\nclient-restricted-denied-count 0\nclient-unrestricted-denied-count 8\nclient-snowflake-match-count 0") + + buf.Reset() + ctx.metrics.zeroMetrics() + + r, err = http.NewRequest("POST", "snowflake.broker/client", data) + r.Header.Set("Snowflake-NAT-TYPE", "unknown") + So(err, ShouldBeNil) + + clientOffers(ctx, w, r) + + ctx.metrics.printMetrics() + So(buf.String(), ShouldContainSubstring, "client-denied-count 8\nclient-restricted-denied-count 8\nclient-unrestricted-denied-count 0\nclient-snowflake-match-count 0") }) }) } diff --git a/broker/snowflake-heap.go b/broker/snowflake-heap.go index 12fe557..16dd264 100644 --- a/broker/snowflake-heap.go +++ b/broker/snowflake-heap.go @@ -11,6 +11,7 @@ over the offer and answer channels. type Snowflake struct { id string proxyType string + natType string offerChannel chan *ClientOffer answerChannel chan []byte clients int diff --git a/doc/broker-spec.txt b/doc/broker-spec.txt index c3177e0..9e4b8ae 100644 --- a/doc/broker-spec.txt +++ b/doc/broker-spec.txt @@ -8,7 +8,7 @@ The Snowflake broker is used to hand out Snowflake proxies to clients using the
This document specifies how the Snowflake broker interacts with other parts of the Tor ecosystem, starting with the metrics CollecTor module and to be expanded upon later.
-1. Metrics Reporting (version 1.0) +1. Metrics Reporting (version 1.1)
Metrics data from the Snowflake broker can be retrieved by sending an HTTP GET request to https://%5BSnowflake broker URL]/metrics and consists of the following items:
@@ -62,12 +62,44 @@ Metrics data from the Snowflake broker can be retrieved by sending an HTTP GET r from the broker but no proxies were available, rounded up to the nearest multiple of 8.
+ "client-restricted-denied-count" NUM NL + [At most once.] + + A count of the number of times a client with a restricted or + unknown NAT type has requested a proxy from the broker but no + proxies were available, rounded up to the nearest multiple of 8. + + "client-unrestricted-denied-count" NUM NL + [At most once.] + + A count of the number of times a client with an unrestricted NAT + type has requested a proxy from the broker but no proxies were + available, rounded up to the nearest multiple of 8. + "client-snowflake-match-count" NUM NL [At most once.]
A count of the number of times a client successfully received a proxy from the broker, rounded up to the nearest multiple of 8.
+ "snowflake-ips-nat-restricted" NUM NL + [At most once.] + + A count of the total number of unique IP addresses of snowflake + proxies that have a restricted NAT type. + + "snowflake-ips-nat-unrestricted" NUM NL + [At most once.] + + A count of the total number of unique IP addresses of snowflake + proxies that have an unrestricted NAT type. + + "snowflake-ips-nat-unknown" NUM NL + [At most once.] + + A count of the total number of unique IP addresses of snowflake + proxies that have an unknown NAT type. + 2. Broker messaging specification and endpoints
The broker facilitates the connection of snowflake clients and snowflake proxies