Use go modules

* Update Makefile and Dockerfile to use go modules
* Tidy modules - go mod tidy
* Update Dockerfile and Makefile to use vendor dir
* Update travis config to use go modules in fossa check
* Update contributing guide

.travis.yml

@@ -13,4 +13,4 @@ before_install:
 - if [[ "${TRAVIS_PULL_REQUEST_SLUG}" == "nginxinc/nginx-prometheus-exporter" || "${TRAVIS_PULL_REQUEST}" == "false" ]]; then
   wget https://${fossalocation}/${fossafile} && tar xzf ${fossafile}
   && ./fossa init
-  && FOSSA_API_KEY=${fossapush} ./fossa analyze -t nginx-prometheus-exporter -b ${TRAVIS_BRANCH}; fi
+  && GO111MODULE=on FOSSA_API_KEY=${fossapush} ./fossa analyze -t nginx-prometheus-exporter -b ${TRAVIS_BRANCH}; fi

CONTRIBUTING.md

@@ -28,7 +28,7 @@ Follow our [Getting Started Guide](README.md#getting-started) to get the NGINX P
 ### Project Structure
 
 * This Prometheus Exporter is written in Go and supports both the open source NGINX software and NGINX Plus.
-* The project dependencies reside in the `/vendor`. We use [dep](https://github.com/golang/dep) for managing dependencies.
+* The project dependencies reside in the `/vendor`. We use [go modules](https://github.com/golang/go/wiki/Modules) for managing dependencies.
 
 ## Contributing
 

Dockerfile

@@ -4,10 +4,11 @@ ARG GIT_COMMIT
 WORKDIR /go/src/github.com/nginxinc/nginx-prometheus-exporter
 COPY *.go ./
 COPY vendor ./vendor
+COPY go.mod go.sum ./
 COPY collector ./collector
 COPY client ./client
-RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -ldflags "-X main.version=${VERSION} -X main.gitCommit=${GIT_COMMIT}" -o exporter .
+RUN GO111MODULE=on CGO_ENABLED=0 GOOS=linux go build -mod=vendor -a -installsuffix cgo -ldflags "-X main.version=${VERSION} -X main.gitCommit=${GIT_COMMIT}" -o exporter .
 
 FROM alpine:latest
 COPY --from=builder /go/src/github.com/nginxinc/nginx-prometheus-exporter/exporter /usr/bin/
-ENTRYPOINT [ "/usr/bin/exporter" ]
+ENTRYPOINT [ "/usr/bin/exporter" ]

Makefile

@@ -6,13 +6,13 @@ GIT_COMMIT = $(shell git rev-parse --short HEAD)
 BUILD_DIR = build_output
 
 nginx-prometheus-exporter: test
-	CGO_ENABLED=0 go build -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o nginx-prometheus-exporter 
+	GO111MODULE=on CGO_ENABLED=0 go build -mod=vendor -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o nginx-prometheus-exporter
 
 lint:
 	golangci-lint run
 
 test:
-	go test ./...
+	GO111MODULE=on go test -mod=vendor ./...
 
 container:
 	docker build --build-arg VERSION=$(VERSION) --build-arg GIT_COMMIT=$(GIT_COMMIT) -t $(PREFIX):$(TAG) . 
@@ -21,10 +21,10 @@ push: container
 	docker push $(PREFIX):$(TAG)
 
 $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64:
-	GOARCH=amd64 CGO_ENABLED=0 GOOS=linux go build -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64
+	GO111MODULE=on GOARCH=amd64 CGO_ENABLED=0 GOOS=linux go build -mod=vendor -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64
 
 $(BUILD_DIR)/nginx-prometheus-exporter-linux-i386:
-	GOARCH=386 CGO_ENABLED=0 GOOS=linux go build -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o $(BUILD_DIR)/nginx-prometheus-exporter-linux-i386
+	GO111MODULE=on GOARCH=386 CGO_ENABLED=0 GOOS=linux go build -mod=vendor -installsuffix cgo -ldflags "-X main.version=$(VERSION) -X main.gitCommit=$(GIT_COMMIT)" -o $(BUILD_DIR)/nginx-prometheus-exporter-linux-i386
 
 release: $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64 $(BUILD_DIR)/nginx-prometheus-exporter-linux-i386
 	mv $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64 $(BUILD_DIR)/nginx-prometheus-exporter && \
@@ -34,7 +34,7 @@ release: $(BUILD_DIR)/nginx-prometheus-exporter-linux-amd64 $(BUILD_DIR)/nginx-p
 	mv $(BUILD_DIR)/nginx-prometheus-exporter-linux-i386 $(BUILD_DIR)/nginx-prometheus-exporter && \
 	tar czf $(BUILD_DIR)/nginx-prometheus-exporter-$(TAG)-linux-i386.tar.gz -C $(BUILD_DIR) nginx-prometheus-exporter && \
 	rm $(BUILD_DIR)/nginx-prometheus-exporter
-    
+
 	shasum -a 256 $(BUILD_DIR)/nginx-prometheus-exporter-$(TAG)-linux-amd64.tar.gz $(BUILD_DIR)/nginx-prometheus-exporter-$(TAG)-linux-i386.tar.gz|sed "s|$(BUILD_DIR)/||" > $(BUILD_DIR)/sha256sums.txt
 
 clean:

go.mod

@@ -0,0 +1,8 @@
+module github.com/nginxinc/nginx-prometheus-exporter
+
+go 1.12
+
+require (
+	github.com/nginxinc/nginx-plus-go-sdk v0.0.0-20180910131828-47154e1ef115
+	github.com/prometheus/client_golang v0.9.2
+)

go.sum

@@ -0,0 +1,19 @@
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLMYoU8P317H5OQ+Via4RmuPwCS0=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/golang/protobuf v1.2.0 h1:P3YflyNX/ehuJFLhxviNdFxQPkGK5cDcApsge1SqnvM=
+github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
+github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
+github.com/nginxinc/nginx-plus-go-sdk v0.0.0-20180910131828-47154e1ef115 h1:CWauBkD0d1oC7C4sZ+MeggmcYMVK0WHQZZFjsys0Cq0=
+github.com/nginxinc/nginx-plus-go-sdk v0.0.0-20180910131828-47154e1ef115/go.mod h1:QqHe+Px9tTm7GOQUBDQGDQHA9m/J+J3JjHbxgri5gSw=
+github.com/prometheus/client_golang v0.9.2 h1:awm861/B8OKDd2I/6o1dy3ra4BamzKhYOiGItCeZ740=
+github.com/prometheus/client_golang v0.9.2/go.mod h1:OsXs2jCmiKlQ1lTBmv21f2mNfw4xf/QclQDMrYNZzcM=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 h1:idejC8f05m9MGOsuEi1ATq9shN03HrxNkD/luQvxCv8=
+github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:MbSGuTsp3dbXC40dX6PRTWyKYBIrTGTE9sqQNg2J8bo=
+github.com/prometheus/common v0.0.0-20181126121408-4724e9255275 h1:PnBWHBf+6L0jOqq0gIVUe6Yk0/QMZ640k6NvkxcBf+8=
+github.com/prometheus/common v0.0.0-20181126121408-4724e9255275/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
+github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a h1:9a8MnZMP0X2nLJdBg+pBmGgkJlSaKC2KaQmTCk1XDtE=
+github.com/prometheus/procfs v0.0.0-20181204211112-1dc9a6cbc91a/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f h1:Bl/8QSvNqXvPGPGXa2z5xUTmV7VDcZyvRZ+QQXkXTZQ=
+golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=