first pass at a docker system test

Signed-off-by: kung-foo <github@jonathan.camp>

system_test/Dockerfile

@@ -0,0 +1,12 @@
+FROM golang:1.8-alpine
+
+RUN apk update && apk add curl build-base iptables libpcap-dev "libnetfilter_queue-dev>=1.0.0" git gcc libc-dev linux-headers
+RUN go get golang.org/x/net/bpf
+RUN go get golang.org/x/net/context
+RUN go get golang.org/x/net/proxy
+RUN go get github.com/smartystreets/goconvey
+
+WORKDIR /go/src/github.com/kung-foo/freki
+
+RUN curl -s -L https://github.com/kung-foo/waitforit/releases/download/v0.0.1/waitforit-linux-amd64 > /bin/waitforit
+RUN chmod +x /bin/waitforit

system_test/docker-compose.yml

@@ -0,0 +1,18 @@
+version: '3.1'
+
+services:
+  freki:
+    build: .
+    stop_signal: SIGINT
+    cap_add:
+      - NET_ADMIN
+    command: system_test/run_freki.sh
+    volumes:
+      - ../:/go/src/github.com/kung-foo/freki:ro
+  test:
+    build: .
+    command: system_test/run_test.sh
+    volumes:
+      - ../:/go/src/github.com/kung-foo/freki:ro
+    links:
+      - freki

system_test/rules.yaml

@@ -0,0 +1,9 @@
+version: 1
+rules:
+  - match: tcp port 80 or tcp port 8080
+    type: log_http
+  - match: tcp port 1337
+    type: proxy
+    target: tcp://port.party:666
+  - match:
+    type: passthrough

system_test/run_freki.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env ash
+
+set -ex
+
+go build -o /tmp/freki app/main.go
+exec /tmp/freki -v -i eth0 -r system_test/rules.yaml

system_test/run_test.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env ash
+
+set -ex
+
+echo "Wating for freki to start..."
+waitforit -r 60 -s http://freki:80
+
+go test -v system_test/system_test.go

system_test/system_test.go

@@ -0,0 +1,55 @@
+package system_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestEndToEnd(t *testing.T) {
+	Convey("Given freki is working...", t, func() {
+		Convey("Port 80 and 8080 should return OK", func() {
+			f := func(p int) {
+				resp, err := http.Get(fmt.Sprintf("http://freki:%d/", p))
+
+				So(err, ShouldBeNil)
+				So(resp, ShouldNotBeNil)
+
+				So(resp.StatusCode, ShouldEqual, 200)
+
+				body, err := ioutil.ReadAll(resp.Body)
+				So(err, ShouldBeNil)
+				So(bytes.Equal(body, []byte("OK\n")), ShouldBeTrue)
+				resp.Body.Close()
+			}
+
+			f(80)
+			f(8080)
+		})
+
+		Convey("Port 1137 should proxy to port.party:666", func() {
+			resp, err := http.Get("http://freki:1337/cors.json")
+			So(err, ShouldBeNil)
+			So(resp, ShouldNotBeNil)
+
+			So(resp.StatusCode, ShouldEqual, 200)
+
+			body, err := ioutil.ReadAll(resp.Body)
+			So(err, ShouldBeNil)
+
+			j := make(map[string]int)
+
+			So(json.Unmarshal(body, &j), ShouldBeNil)
+
+			So(j, ShouldContainKey, "Port")
+			So(j["Port"], ShouldEqual, 666)
+
+			resp.Body.Close()
+		})
+	})
+}