Add middleware template with http.HandlerFunc as entry point

- of-watchdog 0.2.7
- go 1.10
- alpine 3.8

Signed-off-by: Stefan Prodan <stefan.prodan@gmail.com>

Author: stefanprodan

.gitignore

@@ -1 +1,3 @@
 build
+test
+test.yml

template/golang-middleware/Dockerfile

@@ -0,0 +1,40 @@
+FROM golang:1.10.4-alpine3.8
+
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+RUN apk --no-cache add curl \
+    && echo "Pulling watchdog binary from Github." \
+    && curl -sSLf https://github.com/openfaas-incubator/of-watchdog/releases/download/0.2.7/of-watchdog > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog \
+    && apk del curl --no-cache
+
+RUN mkdir -p /go/src/handler
+WORKDIR /go/src/handler
+COPY . .
+
+# Run a gofmt and exclude all vendored code.
+RUN test -z "$(gofmt -l $(find . -type f -name '*.go' -not -path "./vendor/*" -not -path "./function/vendor/*"))" || { echo "Run \"gofmt -s -w\" on your Golang code"; exit 1; }
+
+RUN CGO_ENABLED=0 GOOS=linux \
+    go build --ldflags "-s -w" -a -installsuffix cgo -o handler . && \
+    go test $(go list ./... | grep -v /vendor/) -cover
+
+FROM alpine:3.8
+RUN apk --no-cache add ca-certificates
+
+# Add non root user
+RUN addgroup -S app && adduser -S -g app app
+RUN mkdir -p /home/app
+RUN chown app /home/app
+
+WORKDIR /home/app
+
+COPY --from=0 /go/src/handler/handler    .
+COPY --from=0 /usr/bin/fwatchdog         .
+# RUN apk add --no-cache curl
+USER app
+
+ENV fprocess="./handler"
+ENV mode="http"
+ENV upstream_url="http://127.0.0.1:8081"
+
+CMD ["./fwatchdog"]

template/golang-middleware/function/handler.go

@@ -0,0 +1,24 @@
+package function
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net/http"
+)
+
+func Handle(w http.ResponseWriter, r *http.Request) {
+	// read request payload
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	// log to stdout
+	fmt.Printf("request payload: %s", string(body))
+
+	// write result
+	message := fmt.Sprintf("Hello world, input was: %s", string(body))
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(message))
+}

template/golang-middleware/main.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	"handler/function"
+	//"github.com/openfaas-incubator/golang-http-template/template/golang-middleware/function"
+)
+
+func main() {
+	s := &http.Server{
+		Addr:           fmt.Sprintf(":%d", 8081),
+		ReadTimeout:    3 * time.Second,
+		WriteTimeout:   3 * time.Second,
+		MaxHeaderBytes: 1 << 20, // Max header of 1MB
+	}
+
+	http.HandleFunc("/", function.Handle)
+	log.Fatal(s.ListenAndServe())
+}

template/golang-middleware/template.yml

@@ -0,0 +1,2 @@
+language: go
+fprocess: ./handler