Proxy from faasd to gateway

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

.gitignore

@@ -1,3 +1,4 @@
 /faasd
 hosts
 /resolv.conf
+.idea/

cmd/up.go

@@ -65,6 +65,7 @@ func runUp(_ *cobra.Command, _ []string) error {
 	log.Printf("Supervisor init done in: %s\n", time.Since(start).String())
 
 	shutdownTimeout := time.Second * 1
+	timeout := time.Second * 60
 
 	wg := sync.WaitGroup{}
 	wg.Add(1)
@@ -85,6 +86,12 @@ func runUp(_ *cobra.Command, _ []string) error {
 		})
 	}()
 
+	go func() {
+		wd, _ := os.Getwd()
+		proxy := pkg.NewProxy(path.Join(wd, "hosts"), timeout)
+		proxy.Start()
+	}()
+
 	wg.Wait()
 	return nil
 }

hack/build-containerd-armhf.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
 
+export ARCH="armv6l"
 echo "Downloading Go"
 
-curl -SLsf https://dl.google.com/go/go1.12.14.linux-armv6l.tar.gz > go.tgz
+curl -SLsf https://dl.google.com/go/go1.12.14.linux-$ARCH.tar.gz --output /tmp/go.tgz
 sudo rm -rf /usr/local/go/
 sudo mkdir -p /usr/local/go/
-sudo tar -xvf go.tgz -C /usr/local/go/ --strip-components=1
+sudo tar -xvf /tmp/go.tgz -C /usr/local/go/ --strip-components=1
 
 export GOPATH=$HOME/go/
 export PATH=$PATH:/usr/local/go/bin/

hack/build-containerd.sh

@@ -1,11 +1,12 @@
 #!/bin/bash
 
+export ARCH="amd64"
 echo "Downloading Go"
 
-curl -SLsf https://dl.google.com/go/go1.12.14.linux-amd64.tar.gz > go.tgz
+curl -SLsf https://dl.google.com/go/go1.12.14.linux-$ARCH.tar.gz --output /tmp/go.tgz
 sudo rm -rf /usr/local/go/
 sudo mkdir -p /usr/local/go/
-sudo tar -xvf go.tgz -C /usr/local/go/ --strip-components=1
+sudo tar -xvf /tmp/go.tgz -C /usr/local/go/ --strip-components=1
 
 export GOPATH=$HOME/go/
 export PATH=$PATH:/usr/local/go/bin/

pkg/proxy.go

@@ -0,0 +1,98 @@
+package pkg
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strings"
+
+	"time"
+)
+
+func NewProxy(hosts string, timeout time.Duration) *Proxy {
+
+	return &Proxy{
+		Hosts:   hosts,
+		Timeout: timeout,
+	}
+}
+
+type Proxy struct {
+	Hosts   string
+	Timeout time.Duration
+}
+
+func (p *Proxy) Start() error {
+	tcp := 8080
+
+	time.Sleep(3 * time.Second)
+	log.Printf("Starting faasd proxy on %d\n", tcp)
+	data := struct{ host string }{
+		host: "",
+	}
+
+	fileData, fileErr := ioutil.ReadFile(p.Hosts)
+	if fileErr != nil {
+		return fileErr
+	}
+
+	lines := strings.Split(string(fileData), "\n")
+	for _, line := range lines {
+		if strings.Index(line, "gateway") > -1 {
+			data.host = line[:strings.Index(line, "\t")]
+		}
+	}
+	fmt.Printf("Gateway: %s\n", data.host)
+
+	s := &http.Server{
+		Addr:           fmt.Sprintf(":%d", tcp),
+		ReadTimeout:    p.Timeout,
+		WriteTimeout:   p.Timeout,
+		MaxHeaderBytes: 1 << 20, // Max header of 1MB
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+
+			query := ""
+			if len(r.URL.RawQuery) > 0 {
+				query = "?" + r.URL.RawQuery
+			}
+
+			upstream := fmt.Sprintf("http://%s:8080%s%s", data.host, r.URL.Path, query)
+			fmt.Printf("Forward to %s %s\n", upstream, data)
+
+			if r.Body != nil {
+				defer r.Body.Close()
+			}
+
+			wrapper := ioutil.NopCloser(r.Body)
+			upReq, upErr := http.NewRequest(r.Method, upstream, wrapper)
+
+			if upErr != nil {
+				log.Println(upErr)
+
+				http.Error(w, upErr.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			upRes, upResErr := http.DefaultClient.Do(upReq)
+
+			if upResErr != nil {
+				log.Println(upResErr)
+
+				http.Error(w, upResErr.Error(), http.StatusInternalServerError)
+				return
+			}
+
+			for k, v := range upRes.Header {
+				w.Header().Set(k, v[0])
+			}
+
+			w.WriteHeader(upRes.StatusCode)
+			io.Copy(w, upRes.Body)
+
+		}),
+	}
+
+	return s.ListenAndServe()
+}

pkg/supervisor.go

@@ -186,7 +186,6 @@ func (s *Supervisor) Start(svcs []Service) error {
 		}
 		log.Println("Exited: ", exitStatusC)
 
-		// call start on the task to execute the redis server
 		if err := task.Start(ctx); err != nil {
 			log.Println("Task err: ", err)
 			return err

pkg/systemd/systemd.go

@@ -66,7 +66,7 @@ func DaemonReload() error {
 
 func InstallUnit(name string) error {
 	tmplName := "./hack/" + name + ".service"
-	tmpl, err := template.ParseFiles()
+	tmpl, err := template.ParseFiles(tmplName)
 
 	if err != nil {
 		return fmt.Errorf("error loading template %s, error %s", tmplName, err)