feat: upgrade to go 1.18 and use workspaces to manage the handler

Replace the custom bash script with a Go workspace, to handle setting
the correct imports and replacements during the Go builds. This is
simpler and uses offical Go tooling.

Signed-off-by: Lucas Roesler <roesler.lucas@gmail.com>

Author: LucasRoesler

.gitignore

@@ -1,4 +1,5 @@
 build
 test
 test.yml
-.DS_STORE
+.DS_STORE
+.vscode

go.work

@@ -0,0 +1,6 @@
+go 1.18
+
+use (
+	./template/golang-http
+	./template/golang-middleware
+)

template/golang-http/Dockerfile

@@ -1,5 +1,5 @@
 FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/of-watchdog:0.9.3 as watchdog
-FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.17-alpine3.15 as build
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.18-alpine3.15 as build
 
 ARG TARGETPLATFORM
 ARG BUILDPLATFORM
@@ -11,7 +11,6 @@ RUN apk --no-cache add git
 COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
 RUN chmod +x /usr/bin/fwatchdog
 
-ENV CGO_ENABLED=0
 
 RUN mkdir -p /go/src/handler
 WORKDIR /go/src/handler
@@ -20,10 +19,9 @@ COPY . .
 ARG GO111MODULE="on"
 ARG GOPROXY=""
 ARG GOFLAGS=""
-ARG DEBUG=0
+ARG CGO_ENABLED=0
+ENV CGO_ENABLED=${CGO_ENABLED}
 
-# Lift the vendor and go.mod to the main package, cleanup any relative references
-RUN sh modules-cleanup.sh
 
 # 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; }

template/golang-http/function/go.mod

@@ -0,0 +1,3 @@
+module handler/function
+
+go 1.18

template/golang-http/go.mod

@@ -1,7 +1,5 @@
 module handler
 
-go 1.16
-
-replace handler/function => ./function
+go 1.18
 
 require github.com/openfaas/templates-sdk v0.0.0-20200723092016-0ebf61253625

template/golang-http/go.work

@@ -0,0 +1,6 @@
+go 1.18
+
+use (
+	.
+	./function
+)

template/golang-http/modules-cleanup.sh

@@ -1,5 +1,5 @@
 FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/of-watchdog:0.9.3 as watchdog
-FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.17-alpine3.15 as build
+FROM --platform=${BUILDPLATFORM:-linux/amd64} golang:1.18-alpine3.15 as build
 
 ARG TARGETPLATFORM
 ARG BUILDPLATFORM
@@ -11,7 +11,6 @@ RUN apk --no-cache add git
 COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
 RUN chmod +x /usr/bin/fwatchdog
 
-ENV CGO_ENABLED=0
 
 RUN mkdir -p /go/src/handler
 WORKDIR /go/src/handler
@@ -20,10 +19,8 @@ COPY . .
 ARG GO111MODULE="on"
 ARG GOPROXY=""
 ARG GOFLAGS=""
-ARG DEBUG=0
-
-# Lift the vendor and go.mod to the main package, cleanup any relative references
-RUN sh modules-cleanup.sh
+ARG CGO_ENABLED=0
+ENV CGO_ENABLED=${CGO_ENABLED}
 
 # Run a gofmt and exclude all vendored code.
 RUN test -z "$(gofmt -l $(find . -type f -name '*.go' -not -path "./vendor/*" -not -path "./function/vendor/*"))" || { echo "Run \"gofmt -s -w\" on your Golang code"; exit 1; }
@@ -33,7 +30,7 @@ WORKDIR /go/src/handler/function
 RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH} go test ./... -cover
 
 WORKDIR /go/src/handler
-RUN CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
+RUN GOOS=${TARGETOS} GOARCH=${TARGETARCH} \
     go build --ldflags "-s -w" -a -installsuffix cgo -o handler .
 
 FROM --platform=${TARGETPLATFORM:-linux/amd64} alpine:3.14

template/golang-middleware/Dockerfile

@@ -0,0 +1,3 @@
+module handler/function
+
+go 1.18

template/golang-middleware/function/go.mod

@@ -1,5 +1,3 @@
 module handler
 
-go 1.16
-
-replace handler/function => ./function
+go 1.18