Add OpenFaaS Clear Linux based GO template

Signed-off-by: Sophia Gong <sophia.gong@intel.com>

FaaS/OpenFaaS/template/README.md

@@ -93,6 +93,29 @@ Steps could refer to
 
     Then you can invoke your python function by OpenFaas UI or faas-cli.
     
+### go-clearlinux
+1.  mkdir test && cd test
+2.  `cp -r "<your-dockerfiles-path>"/FaaS/OpenFaaS/template/. template/`
+3.  `faas-cli new --lang go-clearlinux go-openfaas --prefix="<your-docker-username-here>"`
+
+    Files tree as below.
+> 
+    ├── go-openfaas
+    │   ├── handler.go
+    ├── go-openfaas.yml
+    └── template
+
+
+    *  Put the required Clear Linux bundles in the "bundles.txt".
+    For example,
+
+    `echo "openblas" >> go-openfaas/bundles.txt`
+    `echo "wget" >> go-openfaas/bundles.txt`
+4.  `faas-cli up -f go-openfaas.yml`
+
+    Then you can invoke your go function by OpenFaas UI or faas-cli.
+
+    
 ## Proxy and Clear Linux mirror
 
 When working behind a Proxy, you can pass proxy settings to faas-cli commands by "--build-arg".

FaaS/OpenFaaS/template/go-clearlinux/Dockerfile

@@ -0,0 +1,56 @@
+FROM openfaas/classic-watchdog:0.18.1 as watchdog
+
+FROM clearlinux/golang as builder
+
+# Allows you to add additional packages via build-arg
+ARG CGO_ENABLED=0
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+WORKDIR /go/src/handler
+COPY . .
+
+# install bundles if required
+# PLEASE input bundle line by line
+COPY bundles.txt  .
+RUN for bundle in $(cat bundles.txt); do \
+        swupd bundle-add $bundle $swupd_args; \
+    done
+
+# Run a gofmt and exclude all vendored code.
+RUN test -z "$(gofmt -l $(find . -type f -name '*.go' -not -path "./vendor/*" -not -path "./function/vendor/*"))" || { echo "Run \"gofmt -s -w\" on your Golang code"; exit 1; }
+
+RUN CGO_ENABLED=${CGO_ENABLED} GOOS=linux \
+    go build --ldflags "-s -w" -a -installsuffix cgo -o handler . && \
+    go test $(go list ./... | grep -v /vendor/) -cover
+
+FROM clearlinux:base
+
+# Add non root user
+RUN groupadd app && useradd -g app app
+RUN mkdir -p /home/app
+
+WORKDIR /home/app
+
+# install bundles if required
+# PLEASE input bundle line by line
+COPY bundles.txt  .
+RUN for bundle in $(cat bundles.txt); do \
+        swupd bundle-add $bundle $swupd_args; \
+    done
+
+COPY --from=builder /usr/bin/fwatchdog         .
+COPY --from=builder /go/src/handler/function/  .
+COPY --from=builder /go/src/handler/handler    .
+
+RUN chown -R app /home/app
+
+USER app
+
+ENV fprocess="./handler"
+EXPOSE 8080
+
+HEALTHCHECK --interval=3s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["./fwatchdog"]

FaaS/OpenFaaS/template/go-clearlinux/function/handler.go

@@ -0,0 +1,10 @@
+package function
+
+import (
+	"fmt"
+)
+
+// Handle a serverless request
+func Handle(req []byte) string {
+	return fmt.Sprintf("Hello, Go. You said: %s", string(req))
+}

FaaS/OpenFaaS/template/go-clearlinux/main.go

@@ -0,0 +1,22 @@
+// Copyright (c) Alex Ellis 2017. All rights reserved.
+// Copyright (c) OpenFaaS Author(s) 2018. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+package main
+
+import (
+	"fmt"
+	"handler/function"
+	"io/ioutil"
+	"log"
+	"os"
+)
+
+func main() {
+	input, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatalf("Unable to read standard input: %s", err.Error())
+	}
+
+	fmt.Println(function.Handle(input))
+}

FaaS/OpenFaaS/template/go-clearlinux/template.yml

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