Add files

Dockerfile

@@ -0,0 +1,7 @@
+FROM golang:alpine
+
+ADD . /go/src/git.netflux.io/rob/simple-http-page-docker/
+RUN go install git.netflux.io/rob/simple-http-page-docker
+ENTRYPOINT /go/bin/simple-http-page-docker
+
+EXPOSE 3000

LICENSE

@@ -1,4 +1,4 @@
-MIT License Copyright (c) <year> <copyright holders>
+MIT License Copyright (c) 2020 Rob Watson
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -1,3 +1,11 @@
 # simple-http-page-docker
 
 A Docker container that runs an HTTP server returning a simple one-line plain text response.
+
+Available at https://hub.docker.com/r/netfluxio/simple-http-page-docker.
+
+Environment variables:
+
+* `RESPONSE_STRING` - the HTTP response body
+* `STATUS_CODE` - the numeric HTTP status code (default: 200)
+* `BIND_ADDR` - bind string (default: `:3000`)

main.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+)
+
+const (
+	defaultBindAddress    = ":3000"
+	defaultResponseString = "Hello world"
+	defaultResponseStatus = http.StatusOK
+)
+
+func main() {
+	addr, ok := os.LookupEnv("BIND_ADDR")
+	if !ok {
+		addr = defaultBindAddress
+	}
+
+	responseString, ok := os.LookupEnv("RESPONSE_STRING")
+	if !ok {
+		responseString = defaultResponseString
+	}
+
+	var statusCode int
+	statusCodeString, ok := os.LookupEnv("STATUS_CODE")
+	if ok {
+		var err error
+		statusCode, err = strconv.Atoi(statusCodeString)
+		if err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		statusCode = defaultResponseStatus
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+		w.Header().Set("Content-Type", "text/plain")
+		w.WriteHeader(statusCode)
+		fmt.Fprintf(w, responseString)
+	})
+
+	fmt.Printf("Listening on %s...\n", addr)
+	log.Fatal(http.ListenAndServe(addr, nil))
+}