Add exampleapp for testing

mumoshu · Nov 23, 2021 · 0db3b34 · 0db3b34
1 parent 8f7971d
commit 0db3b34
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Showing 7 changed files with 394 additions and 15 deletions.
diff --git a/exampleapp/Dockerfile b/exampleapp/Dockerfile
@@ -0,0 +1,36 @@
+FROM golang:1.17 as builder
+
+ARG TARGETPLATFORM
+
+WORKDIR /workspace
+
+ENV GO111MODULE=on \
+  CGO_ENABLED=0
+
+# Copy the Go Modules manifests
+COPY go.mod go.sum ./
+
+# cache deps before building and copying source so that we don't need to re-download as much
+# and so that source changes don't invalidate our downloaded layer
+RUN go mod download
+
+# Copy the go source
+COPY . .
+
+# Build
+RUN export GOOS=$(echo ${TARGETPLATFORM} | cut -d / -f1) && \
+  export GOARCH=$(echo ${TARGETPLATFORM} | cut -d / -f2) && \
+  GOARM=$(echo ${TARGETPLATFORM} | cut -d / -f3 | cut -c2-) && \
+  go build -a -o exampleapp main.go
+
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static:nonroot
+
+WORKDIR /
+
+COPY --from=builder /workspace/exampleapp .
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/exampleapp"]
diff --git a/exampleapp/Makefile b/exampleapp/Makefile
@@ -0,0 +1,71 @@
+NAME ?= mumoshu/okra-exampleapp
+VERSION ?= latest
+GO ?= go
+
+# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
+ifeq (,$(shell go env GOBIN))
+GOBIN=$(shell go env GOPATH)/bin
+else
+GOBIN=$(shell go env GOBIN)
+endif
+
+# default list of platforms for which multiarch image is built
+ifeq (${PLATFORMS}, )
+	export PLATFORMS="linux/amd64,linux/arm64"
+endif
+
+# if IMG_RESULT is unspecified, by default the image will be pushed to registry
+ifeq (${IMG_RESULT}, load)
+	export PUSH_ARG="--load"
+    # if load is specified, image will be built only for the build machine architecture.
+    export PLATFORMS="local"
+else ifeq (${IMG_RESULT}, cache)
+	# if cache is specified, image will only be available in the build cache, it won't be pushed or loaded
+	# therefore no PUSH_ARG will be specified
+else
+	export PUSH_ARG="--push"
+endif
+
+# Run go fmt against code
+fmt:
+	$(GO) fmt ./...
+
+# Run go vet against code
+vet:
+	$(GO) vet ./...
+
+build:
+	$(GO) build .
+
+docker-buildx: buildx
+	export DOCKER_CLI_EXPERIMENTAL=enabled
+	@if ! docker buildx ls | grep -q container-builder; then\
+		docker buildx create --platform ${PLATFORMS} --name container-builder --use;\
+	fi
+	docker buildx build --platform ${PLATFORMS} \
+		-t "${NAME}:${VERSION}" \
+		-f Dockerfile \
+		. ${PUSH_ARG}
+
+OS_NAME := $(shell uname -s | tr A-Z a-z)
+
+BUILDX_VERSION ?= 0.7.0
+
+# find or download controller-gen
+# download controller-gen if necessary
+buildx:
+ifeq (, $(shell [ -e ~/.docker/cli-plugins/docker-buildx ] && echo exists))
+	@{ \
+	set -e ;\
+	BUILDX_TMP_DIR=$$(mktemp -d) ;\
+	cd $$BUILDX_TMP_DIR ;\
+	wget https://github.com/docker/buildx/releases/download/v$(BUILDX_VERSION)/buildx-v$(BUILDX_VERSION).$(OS_NAME)-amd64 ;\
+	chmod a+x buildx-v$(BUILDX_VERSION).$(OS_NAME)-amd64 ;\
+	mkdir -p ~/.docker/cli-plugins ;\
+	mv buildx-v$(BUILDX_VERSION).$(OS_NAME)-amd64 ~/.docker/cli-plugins/docker-buildx ;\
+	rm -rf $$BUILDX_TMP_DIR ;\
+	}
+BUILDX_BIN=~/.docker/cli-plugins/docker-buildx
+else
+BUILDX_BIN=~/.docker/cli-plugins/docker-buildx
+endif
diff --git a/exampleapp/go.mod b/exampleapp/go.mod
@@ -0,0 +1,8 @@
+module github.com/mumoshu/okra/exampleapp
+
+go 1.16
+
+require (
+	github.com/prometheus/client_golang v1.11.0
+	golang.org/x/net v0.0.0-20211118161319-6a13c67c3ce4
+)
diff --git a/exampleapp/go.sum b/exampleapp/go.sum
@@ -0,0 +1,145 @@
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diff --git a/exampleapp/main.go b/exampleapp/main.go
@@ -0,0 +1,93 @@
+package main
+
+// MIT License
+// Copyright (c) 2017 Frederic Branczyk
+//
+// This application has been derived from https://github.com/brancz/prometheus-example-app
+
+import (
+	"flag"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
+)
+
+var (
+	appVersion string
+	version    = prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: "version",
+		Help: "Version information about this binary",
+		ConstLabels: map[string]string{
+			"version": appVersion,
+		},
+	})
+
+	httpRequestsTotal = prometheus.NewCounterVec(prometheus.CounterOpts{
+		Name: "http_requests_total",
+		Help: "Count of all HTTP requests",
+	}, []string{"code", "method"})
+
+	httpRequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Name: "http_request_duration_seconds",
+		Help: "Duration of all HTTP requests",
+	}, []string{"code", "handler", "method"})
+)
+
+func main() {
+	version.Set(1)
+	bind := ""
+	enableH2c := false
+	flagset := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+	flagset.StringVar(&bind, "bind", ":8080", "The socket to bind to.")
+	flagset.BoolVar(&enableH2c, "h2c", false, "Enable h2c (http/2 over tcp) protocol.")
+	flagset.Parse(os.Args[1:])
+
+	r := prometheus.NewRegistry()
+	r.MustRegister(httpRequestsTotal)
+	r.MustRegister(httpRequestDuration)
+	r.MustRegister(version)
+
+	foundHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("Hello from okra example application."))
+	})
+
+	notfoundHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+	})
+
+	errHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+	})
+
+	mux := http.NewServeMux()
+
+	mux.Handle("/", promhttp.InstrumentHandlerDuration(
+		httpRequestDuration.MustCurryWith(prometheus.Labels{"handler": "found"}),
+		promhttp.InstrumentHandlerCounter(httpRequestsTotal, foundHandler),
+	))
+	mux.Handle("/404", promhttp.InstrumentHandlerCounter(
+		httpRequestsTotal,
+		notfoundHandler,
+	))
+	mux.Handle("/500", promhttp.InstrumentHandlerCounter(
+		httpRequestsTotal,
+		errHandler,
+	))
+
+	mux.Handle("/metrics", promhttp.HandlerFor(r, promhttp.HandlerOpts{}))
+
+	var srv *http.Server
+	if enableH2c {
+		srv = &http.Server{Addr: bind, Handler: h2c.NewHandler(mux, &http2.Server{})}
+	} else {
+		srv = &http.Server{Addr: bind, Handler: mux}
+	}
+
+	log.Fatal(srv.ListenAndServe())
+}