mirror of
https://gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/snowflake.git
synced 2025-10-13 20:11:19 -04:00
046dab865f
This will allow browser-based proxies that are unable to determine their NAT type to conservatively label themselves as restricted NATs if they fail to work with clients that have restricted NATs.
611 lines
18 KiB
Go
611 lines
18 KiB
Go
package main
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import (
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"bytes"
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"container/heap"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"net/http/httptest"
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"os"
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"testing"
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"time"
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. "github.com/smartystreets/goconvey/convey"
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)
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func NullLogger() *log.Logger {
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logger := log.New(os.Stdout, "", 0)
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logger.SetOutput(ioutil.Discard)
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return logger
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}
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func TestBroker(t *testing.T) {
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Convey("Context", t, func() {
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ctx := NewBrokerContext(NullLogger())
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Convey("Adds Snowflake", func() {
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So(ctx.snowflakes.Len(), ShouldEqual, 0)
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So(len(ctx.idToSnowflake), ShouldEqual, 0)
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ctx.AddSnowflake("foo", "", NATUnknown)
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So(ctx.snowflakes.Len(), ShouldEqual, 1)
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So(len(ctx.idToSnowflake), ShouldEqual, 1)
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})
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Convey("Broker goroutine matches clients with proxies", func() {
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p := new(ProxyPoll)
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p.id = "test"
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p.offerChannel = make(chan *ClientOffer)
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go func(ctx *BrokerContext) {
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ctx.proxyPolls <- p
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close(ctx.proxyPolls)
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}(ctx)
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ctx.Broker()
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So(ctx.snowflakes.Len(), ShouldEqual, 1)
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snowflake := heap.Pop(ctx.snowflakes).(*Snowflake)
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snowflake.offerChannel <- &ClientOffer{sdp: []byte("test offer")}
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offer := <-p.offerChannel
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So(ctx.idToSnowflake["test"], ShouldNotBeNil)
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So(offer.sdp, ShouldResemble, []byte("test offer"))
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So(ctx.snowflakes.Len(), ShouldEqual, 0)
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})
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Convey("Request an offer from the Snowflake Heap", func() {
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done := make(chan *ClientOffer)
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go func() {
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offer := ctx.RequestOffer("test", "", NATUnknown)
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done <- offer
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}()
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request := <-ctx.proxyPolls
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request.offerChannel <- &ClientOffer{sdp: []byte("test offer")}
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offer := <-done
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So(offer.sdp, ShouldResemble, []byte("test offer"))
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})
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Convey("Responds to client offers...", func() {
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w := httptest.NewRecorder()
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data := bytes.NewReader([]byte("test"))
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r, err := http.NewRequest("POST", "snowflake.broker/client", data)
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So(err, ShouldBeNil)
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Convey("with 503 when no snowflakes are available.", func() {
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clientOffers(ctx, w, r)
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So(w.Code, ShouldEqual, http.StatusServiceUnavailable)
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So(w.Body.String(), ShouldEqual, "")
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})
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Convey("with a proxy answer if available.", func() {
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done := make(chan bool)
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// Prepare a fake proxy to respond with.
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snowflake := ctx.AddSnowflake("fake", "", NATUnknown)
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go func() {
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clientOffers(ctx, w, r)
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done <- true
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}()
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offer := <-snowflake.offerChannel
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So(offer.sdp, ShouldResemble, []byte("test"))
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snowflake.answerChannel <- []byte("fake answer")
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<-done
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So(w.Body.String(), ShouldEqual, "fake answer")
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So(w.Code, ShouldEqual, http.StatusOK)
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})
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Convey("Times out when no proxy responds.", func() {
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if testing.Short() {
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return
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}
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done := make(chan bool)
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snowflake := ctx.AddSnowflake("fake", "", NATUnknown)
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go func() {
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clientOffers(ctx, w, r)
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// Takes a few seconds here...
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done <- true
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}()
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offer := <-snowflake.offerChannel
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So(offer.sdp, ShouldResemble, []byte("test"))
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<-done
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So(w.Code, ShouldEqual, http.StatusGatewayTimeout)
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})
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})
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Convey("Responds to proxy polls...", func() {
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done := make(chan bool)
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w := httptest.NewRecorder()
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data := bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`))
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r, err := http.NewRequest("POST", "snowflake.broker/proxy", data)
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So(err, ShouldBeNil)
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Convey("with a client offer if available.", func() {
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, w, r)
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done <- true
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}(ctx)
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// Pass a fake client offer to this proxy
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p := <-ctx.proxyPolls
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So(p.id, ShouldEqual, "ymbcCMto7KHNGYlp")
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p.offerChannel <- &ClientOffer{sdp: []byte("fake offer")}
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<-done
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So(w.Code, ShouldEqual, http.StatusOK)
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So(w.Body.String(), ShouldEqual, `{"Status":"client match","Offer":"fake offer","NAT":""}`)
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})
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Convey("return empty 200 OK when no client offer is available.", func() {
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, w, r)
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done <- true
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}(ctx)
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p := <-ctx.proxyPolls
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So(p.id, ShouldEqual, "ymbcCMto7KHNGYlp")
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// nil means timeout
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p.offerChannel <- nil
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<-done
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So(w.Body.String(), ShouldEqual, `{"Status":"no match","Offer":"","NAT":""}`)
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So(w.Code, ShouldEqual, http.StatusOK)
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})
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})
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Convey("Responds to proxy answers...", func() {
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s := ctx.AddSnowflake("test", "", NATUnknown)
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w := httptest.NewRecorder()
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data := bytes.NewReader([]byte(`{"Version":"1.0","Sid":"test","Answer":"test"}`))
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Convey("by passing to the client if valid.", func() {
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r, err := http.NewRequest("POST", "snowflake.broker/answer", data)
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyAnswers(ctx, w, r)
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}(ctx)
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answer := <-s.answerChannel
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So(w.Code, ShouldEqual, http.StatusOK)
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So(answer, ShouldResemble, []byte("test"))
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})
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Convey("with client gone status if the proxy is not recognized", func() {
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data = bytes.NewReader([]byte(`{"Version":"1.0","Sid":"invalid","Answer":"test"}`))
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r, err := http.NewRequest("POST", "snowflake.broker/answer", data)
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So(err, ShouldBeNil)
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proxyAnswers(ctx, w, r)
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So(w.Code, ShouldEqual, http.StatusOK)
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b, err := ioutil.ReadAll(w.Body)
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So(err, ShouldBeNil)
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So(b, ShouldResemble, []byte(`{"Status":"client gone"}`))
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})
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Convey("with error if the proxy gives invalid answer", func() {
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data := bytes.NewReader(nil)
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r, err := http.NewRequest("POST", "snowflake.broker/answer", data)
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So(err, ShouldBeNil)
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proxyAnswers(ctx, w, r)
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So(w.Code, ShouldEqual, http.StatusBadRequest)
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})
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Convey("with error if the proxy writes too much data", func() {
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data := bytes.NewReader(make([]byte, 100001))
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r, err := http.NewRequest("POST", "snowflake.broker/answer", data)
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So(err, ShouldBeNil)
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proxyAnswers(ctx, w, r)
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So(w.Code, ShouldEqual, http.StatusBadRequest)
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})
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})
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})
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Convey("End-To-End", t, func() {
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ctx := NewBrokerContext(NullLogger())
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Convey("Check for client/proxy data race", func() {
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proxy_done := make(chan bool)
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client_done := make(chan bool)
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go ctx.Broker()
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// Make proxy poll
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wp := httptest.NewRecorder()
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datap := bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`))
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rp, err := http.NewRequest("POST", "snowflake.broker/proxy", datap)
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, wp, rp)
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proxy_done <- true
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}(ctx)
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// Client offer
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wc := httptest.NewRecorder()
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datac := bytes.NewReader([]byte("test"))
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rc, err := http.NewRequest("POST", "snowflake.broker/client", datac)
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So(err, ShouldBeNil)
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go func() {
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clientOffers(ctx, wc, rc)
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client_done <- true
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}()
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<-proxy_done
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So(wp.Code, ShouldEqual, http.StatusOK)
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// Proxy answers
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wp = httptest.NewRecorder()
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datap = bytes.NewReader([]byte(`{"Version":"1.0","Sid":"ymbcCMto7KHNGYlp","Answer":"test"}`))
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rp, err = http.NewRequest("POST", "snowflake.broker/answer", datap)
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyAnswers(ctx, wp, rp)
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proxy_done <- true
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}(ctx)
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<-proxy_done
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<-client_done
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})
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Convey("Ensure correct snowflake brokering", func() {
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done := make(chan bool)
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polled := make(chan bool)
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// Proxy polls with its ID first...
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dataP := bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`))
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wP := httptest.NewRecorder()
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rP, err := http.NewRequest("POST", "snowflake.broker/proxy", dataP)
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So(err, ShouldBeNil)
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go func() {
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proxyPolls(ctx, wP, rP)
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polled <- true
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}()
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// Manually do the Broker goroutine action here for full control.
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p := <-ctx.proxyPolls
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So(p.id, ShouldEqual, "ymbcCMto7KHNGYlp")
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s := ctx.AddSnowflake(p.id, "", NATUnknown)
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go func() {
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offer := <-s.offerChannel
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p.offerChannel <- offer
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}()
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So(ctx.idToSnowflake["ymbcCMto7KHNGYlp"], ShouldNotBeNil)
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// Client request blocks until proxy answer arrives.
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dataC := bytes.NewReader([]byte("fake offer"))
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wC := httptest.NewRecorder()
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rC, err := http.NewRequest("POST", "snowflake.broker/client", dataC)
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So(err, ShouldBeNil)
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go func() {
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clientOffers(ctx, wC, rC)
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done <- true
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}()
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<-polled
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So(wP.Code, ShouldEqual, http.StatusOK)
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So(wP.Body.String(), ShouldResemble, `{"Status":"client match","Offer":"fake offer","NAT":"unknown"}`)
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So(ctx.idToSnowflake["ymbcCMto7KHNGYlp"], ShouldNotBeNil)
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// Follow up with the answer request afterwards
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wA := httptest.NewRecorder()
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dataA := bytes.NewReader([]byte(`{"Version":"1.0","Sid":"ymbcCMto7KHNGYlp","Answer":"test"}`))
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rA, err := http.NewRequest("POST", "snowflake.broker/answer", dataA)
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So(err, ShouldBeNil)
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proxyAnswers(ctx, wA, rA)
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So(wA.Code, ShouldEqual, http.StatusOK)
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<-done
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So(wC.Code, ShouldEqual, http.StatusOK)
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So(wC.Body.String(), ShouldEqual, "test")
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})
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})
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}
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func TestSnowflakeHeap(t *testing.T) {
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Convey("SnowflakeHeap", t, func() {
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h := new(SnowflakeHeap)
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heap.Init(h)
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So(h.Len(), ShouldEqual, 0)
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s1 := new(Snowflake)
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s2 := new(Snowflake)
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s3 := new(Snowflake)
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s4 := new(Snowflake)
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s1.clients = 4
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s2.clients = 5
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s3.clients = 3
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s4.clients = 1
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heap.Push(h, s1)
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So(h.Len(), ShouldEqual, 1)
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heap.Push(h, s2)
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So(h.Len(), ShouldEqual, 2)
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heap.Push(h, s3)
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So(h.Len(), ShouldEqual, 3)
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heap.Push(h, s4)
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So(h.Len(), ShouldEqual, 4)
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heap.Remove(h, 0)
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So(h.Len(), ShouldEqual, 3)
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r := heap.Pop(h).(*Snowflake)
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So(h.Len(), ShouldEqual, 2)
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So(r.clients, ShouldEqual, 3)
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So(r.index, ShouldEqual, -1)
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r = heap.Pop(h).(*Snowflake)
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So(h.Len(), ShouldEqual, 1)
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So(r.clients, ShouldEqual, 4)
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So(r.index, ShouldEqual, -1)
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r = heap.Pop(h).(*Snowflake)
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So(h.Len(), ShouldEqual, 0)
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So(r.clients, ShouldEqual, 5)
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So(r.index, ShouldEqual, -1)
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})
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}
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func TestGeoip(t *testing.T) {
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Convey("Geoip", t, func() {
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tv4 := new(GeoIPv4Table)
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err := GeoIPLoadFile(tv4, "test_geoip")
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So(err, ShouldEqual, nil)
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tv6 := new(GeoIPv6Table)
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err = GeoIPLoadFile(tv6, "test_geoip6")
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So(err, ShouldEqual, nil)
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Convey("IPv4 Country Mapping Tests", func() {
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for _, test := range []struct {
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addr, cc string
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ok bool
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}{
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{
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"129.97.208.23", //uwaterloo
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"CA",
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true,
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},
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{
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"127.0.0.1",
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"",
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false,
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},
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{
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"255.255.255.255",
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"",
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false,
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},
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{
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"0.0.0.0",
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"",
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false,
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},
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{
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"223.252.127.255", //test high end of range
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"JP",
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true,
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},
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{
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"223.252.127.255", //test low end of range
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"JP",
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true,
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},
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} {
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country, ok := GetCountryByAddr(tv4, net.ParseIP(test.addr))
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So(country, ShouldEqual, test.cc)
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So(ok, ShouldResemble, test.ok)
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}
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})
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Convey("IPv6 Country Mapping Tests", func() {
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for _, test := range []struct {
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addr, cc string
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ok bool
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}{
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{
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"2620:101:f000:0:250:56ff:fe80:168e", //uwaterloo
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"CA",
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true,
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},
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{
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"fd00:0:0:0:0:0:0:1",
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"",
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false,
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},
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{
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"0:0:0:0:0:0:0:0",
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"",
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false,
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},
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{
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"ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff",
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"",
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false,
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},
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{
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"2a07:2e47:ffff:ffff:ffff:ffff:ffff:ffff", //test high end of range
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"FR",
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true,
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},
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{
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"2a07:2e40::", //test low end of range
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"FR",
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true,
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},
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} {
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country, ok := GetCountryByAddr(tv6, net.ParseIP(test.addr))
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So(country, ShouldEqual, test.cc)
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So(ok, ShouldResemble, test.ok)
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}
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})
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// Make sure things behave properly if geoip file fails to load
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ctx := NewBrokerContext(NullLogger())
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if err := ctx.metrics.LoadGeoipDatabases("invalid_filename", "invalid_filename6"); err != nil {
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log.Printf("loading geo ip databases returned error: %v", err)
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}
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ctx.metrics.UpdateCountryStats("127.0.0.1", "")
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So(ctx.metrics.tablev4, ShouldEqual, nil)
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})
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}
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func TestMetrics(t *testing.T) {
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Convey("Test metrics...", t, func() {
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done := make(chan bool)
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buf := new(bytes.Buffer)
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ctx := NewBrokerContext(log.New(buf, "", 0))
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err := ctx.metrics.LoadGeoipDatabases("test_geoip", "test_geoip6")
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So(err, ShouldEqual, nil)
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//Test addition of proxy polls
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Convey("for proxy polls", func() {
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w := httptest.NewRecorder()
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data := bytes.NewReader([]byte("{\"Sid\":\"ymbcCMto7KHNGYlp\",\"Version\":\"1.0\"}"))
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r, err := http.NewRequest("POST", "snowflake.broker/proxy", data)
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r.RemoteAddr = "129.97.208.23:8888" //CA geoip
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, w, r)
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done <- true
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}(ctx)
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p := <-ctx.proxyPolls //manually unblock poll
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p.offerChannel <- nil
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<-done
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w = httptest.NewRecorder()
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data = bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0","Type":"standalone"}`))
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r, err = http.NewRequest("POST", "snowflake.broker/proxy", data)
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r.RemoteAddr = "129.97.208.23:8888" //CA geoip
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, w, r)
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done <- true
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}(ctx)
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p = <-ctx.proxyPolls //manually unblock poll
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p.offerChannel <- nil
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<-done
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w = httptest.NewRecorder()
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data = bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0","Type":"badge"}`))
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r, err = http.NewRequest("POST", "snowflake.broker/proxy", data)
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r.RemoteAddr = "129.97.208.23:8888" //CA geoip
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So(err, ShouldBeNil)
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go func(ctx *BrokerContext) {
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proxyPolls(ctx, w, r)
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done <- true
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}(ctx)
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p = <-ctx.proxyPolls //manually unblock poll
|
|
p.offerChannel <- nil
|
|
<-done
|
|
|
|
w = httptest.NewRecorder()
|
|
data = bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0","Type":"webext"}`))
|
|
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(), 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")
|
|
|
|
})
|
|
|
|
//Test addition of client failures
|
|
Convey("for no proxies available", func() {
|
|
w := httptest.NewRecorder()
|
|
data := bytes.NewReader([]byte("test"))
|
|
r, err := http.NewRequest("POST", "snowflake.broker/client", data)
|
|
So(err, ShouldBeNil)
|
|
|
|
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")
|
|
|
|
// 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")
|
|
})
|
|
//Test addition of client matches
|
|
Convey("for client-proxy match", func() {
|
|
w := httptest.NewRecorder()
|
|
data := bytes.NewReader([]byte("test"))
|
|
r, err := http.NewRequest("POST", "snowflake.broker/client", data)
|
|
So(err, ShouldBeNil)
|
|
|
|
// Prepare a fake proxy to respond with.
|
|
snowflake := ctx.AddSnowflake("fake", "", NATUnknown)
|
|
go func() {
|
|
clientOffers(ctx, w, r)
|
|
done <- true
|
|
}()
|
|
offer := <-snowflake.offerChannel
|
|
So(offer.sdp, ShouldResemble, []byte("test"))
|
|
snowflake.answerChannel <- []byte("fake answer")
|
|
<-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")
|
|
})
|
|
//Test rounding boundary
|
|
Convey("binning boundary", func() {
|
|
w := httptest.NewRecorder()
|
|
data := bytes.NewReader([]byte("test"))
|
|
r, err := http.NewRequest("POST", "snowflake.broker/client", data)
|
|
So(err, ShouldBeNil)
|
|
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
clientOffers(ctx, w, r)
|
|
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")
|
|
|
|
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")
|
|
})
|
|
|
|
//Test unique ip
|
|
Convey("proxy counts by unique ip", func() {
|
|
w := httptest.NewRecorder()
|
|
data := bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`))
|
|
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
|
|
|
|
data = bytes.NewReader([]byte(`{"Sid":"ymbcCMto7KHNGYlp","Version":"1.0"}`))
|
|
r, err = http.NewRequest("POST", "snowflake.broker/proxy", data)
|
|
if err != nil {
|
|
log.Printf("unable to get NewRequest with error: %v", err)
|
|
}
|
|
r.RemoteAddr = "129.97.208.23:8888" //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(), 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")
|
|
})
|
|
})
|
|
}
|