Update to go1.12 (#21)

This is useful information to return when (for example) testing a
reverse proxy.

.gitignore

@@ -1 +1,3 @@
-/whoamI
+.idea
+vendor/
+/whoami

Dockerfile

@@ -1,5 +1,10 @@
+FROM golang:1.12 as builder
+WORKDIR /go/whoami
+COPY . .
+RUN make build
+
 # Create a minimal container to run a Golang static binary
 FROM scratch
-COPY whoamI /
+COPY --from=builder /go/whoami/whoami .
-ENTRYPOINT ["/whoamI"]
+ENTRYPOINT ["/whoami"]
 EXPOSE 80

LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
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+      the copyright owner that is granting the License.
+
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+      direction or management of such entity, whether by contract or
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+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
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+      "Derivative Works" shall mean any work, whether in Source or Object
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+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [2015-2018] [Containous]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

Makefile

@@ -0,0 +1,12 @@
+.PHONY: default build dependencies image
+
+default: build
+
+build:
+	CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-s" -o whoami
+
+dependencies:
+	go mod download
+
+image:
+	docker build -t containous/whoami .

README.md

@@ -1,9 +1,11 @@
-# whoamI
+# whoami
+
+[![Docker Pulls](https://img.shields.io/docker/pulls/containous/whoami.svg)](https://hub.docker.com/r/containous/whoami/)
 
 Tiny Go webserver that prints os information and HTTP request to output
 
-```sh
+```console
-$ docker run -d -P --name iamfoo emilevauge/whoami
+$ docker run -d -P --name iamfoo containous/whoami
 $ docker inspect --format '{{ .NetworkSettings.Ports }}'  iamfoo
 map[80/tcp:[{0.0.0.0 32769}]]
 $ curl "http://0.0.0.0:32769"

app.go

@@ -1,28 +1,157 @@
 package main
 
 import (
+	"bytes"
+	"encoding/json"
+	"flag"
 	"fmt"
-	"github.com/gorilla/mux"
+	"io"
 	"log"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
 )
 
-func main() {
+const (
+	_        = iota
+	KB int64 = 1 << (10 * iota)
+	MB
+	GB
+	TB
+)
 
-	r := mux.NewRouter()
+var cert string
-	r.HandleFunc("/", whoamI)
+var key string
-	http.Handle("/", r)
+var port string
-	fmt.Println("Starting up on 80")
+
-	log.Fatal(http.ListenAndServe(":80", nil))
+func init() {
+	flag.StringVar(&cert, "cert", "", "give me a certificate")
+	flag.StringVar(&key, "key", "", "give me a key")
+	flag.StringVar(&port, "port", "80", "give me a port number")
+}
+
+var upgrader = websocket.Upgrader{
+	ReadBufferSize:  1024,
+	WriteBufferSize: 1024,
+}
+
+func main() {
+	flag.Parse()
+
+	http.HandleFunc("/data", dataHandler)
+	http.HandleFunc("/echo", echoHandler)
+	http.HandleFunc("/bench", benchHandler)
+	http.HandleFunc("/", whoamiHandler)
+	http.HandleFunc("/api", apiHandler)
+	http.HandleFunc("/health", healthHandler)
+
+	fmt.Println("Starting up on port " + port)
+
+	if len(cert) > 0 && len(key) > 0 {
+		log.Fatal(http.ListenAndServeTLS(":"+port, cert, key, nil))
+	}
+	log.Fatal(http.ListenAndServe(":"+port, nil))
+}
+
+func benchHandler(w http.ResponseWriter, _ *http.Request) {
+	w.Header().Set("Connection", "keep-alive")
+	w.Header().Set("Content-Type", "text/plain")
+	_, _ = fmt.Fprint(w, "1")
+}
+
+func echoHandler(w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	for {
+		messageType, p, err := conn.ReadMessage()
+		if err != nil {
+			return
+		}
+
+		printBinary(p)
+		err = conn.WriteMessage(messageType, p)
+		if err != nil {
+			return
+		}
+	}
+}
+
+func printBinary(s []byte) {
+	fmt.Printf("Received b:")
+	for n := 0; n < len(s); n++ {
+		fmt.Printf("%d,", s[n])
+	}
+	fmt.Printf("\n")
+}
+
+func dataHandler(w http.ResponseWriter, r *http.Request) {
+	u, _ := url.Parse(r.URL.String())
+	queryParams := u.Query()
+
+	size, err := strconv.ParseInt(queryParams.Get("size"), 10, 64)
+	if err != nil {
+		size = 1
+	}
+	if size < 0 {
+		size = 0
+	}
+
+	unit := queryParams.Get("unit")
+	switch strings.ToLower(unit) {
+	case "kb":
+		size = size * KB
+	case "mb":
+		size = size * MB
+	case "gb":
+		size = size * GB
+	case "tb":
+		size = size * TB
+	}
+
+	attachment, err := strconv.ParseBool(queryParams.Get("attachment"))
+	if err != nil {
+		attachment = false
+	}
+
+	content := fillContent(size)
+
+	if attachment {
+		w.Header().Add("Content-Disposition", "Attachment")
+		http.ServeContent(w, r, "data.txt", time.Now(), content)
+		return
+	}
+
+	if _, err := io.Copy(w, content); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func whoamiHandler(w http.ResponseWriter, req *http.Request) {
+	u, _ := url.Parse(req.URL.String())
+	wait := u.Query().Get("wait")
+	if len(wait) > 0 {
+		duration, err := time.ParseDuration(wait)
+		if err == nil {
+			time.Sleep(duration)
+		}
 	}
 
-func whoamI(w http.ResponseWriter, req *http.Request) {
 	hostname, _ := os.Hostname()
-	fmt.Fprintln(w, "Hostname : ", hostname)
+	_, _ = fmt.Fprintln(w, "Hostname:", hostname)
+
 	ifaces, _ := net.Interfaces()
-	// handle err
 	for _, i := range ifaces {
 		addrs, _ := i.Addrs()
 		// handle err
@@ -34,8 +163,100 @@ func whoamI(w http.ResponseWriter, req *http.Request) {
 			case *net.IPAddr:
 				ip = v.IP
 			}
-			fmt.Fprintln(w, "IP : ", ip)
+			_, _ = fmt.Fprintln(w, "IP:", ip)
 		}
 	}
-	req.Write(w)
+
+	_, _ = fmt.Fprintln(w, "RemoteAddr:", req.RemoteAddr)
+	if err := req.Write(w); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+func apiHandler(w http.ResponseWriter, req *http.Request) {
+	hostname, _ := os.Hostname()
+
+	data := struct {
+		Hostname string      `json:"hostname,omitempty"`
+		IP       []string    `json:"ip,omitempty"`
+		Headers  http.Header `json:"headers,omitempty"`
+		URL      string      `json:"url,omitempty"`
+		Host     string      `json:"host,omitempty"`
+		Method   string      `json:"method,omitempty"`
+	}{
+		Hostname: hostname,
+		IP:       []string{},
+		Headers:  req.Header,
+		URL:      req.URL.RequestURI(),
+		Host:     req.Host,
+		Method:   req.Method,
+	}
+
+	ifaces, _ := net.Interfaces()
+	for _, i := range ifaces {
+		addrs, _ := i.Addrs()
+		// handle err
+		for _, addr := range addrs {
+			var ip net.IP
+			switch v := addr.(type) {
+			case *net.IPNet:
+				ip = v.IP
+			case *net.IPAddr:
+				ip = v.IP
+			}
+			if ip != nil {
+				data.IP = append(data.IP, ip.String())
+			}
+		}
+	}
+
+	if err := json.NewEncoder(w).Encode(data); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+}
+
+type healthState struct {
+	StatusCode int
+}
+
+var currentHealthState = healthState{http.StatusOK}
+var mutexHealthState = &sync.RWMutex{}
+
+func healthHandler(w http.ResponseWriter, req *http.Request) {
+	if req.Method == http.MethodPost {
+		var statusCode int
+
+		if err := json.NewDecoder(req.Body).Decode(&statusCode); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		fmt.Printf("Update health check status code [%d]\n", statusCode)
+
+		mutexHealthState.Lock()
+		defer mutexHealthState.Unlock()
+		currentHealthState.StatusCode = statusCode
+	} else {
+		mutexHealthState.RLock()
+		defer mutexHealthState.RUnlock()
+		w.WriteHeader(currentHealthState.StatusCode)
+	}
+}
+
+func fillContent(length int64) io.ReadSeeker {
+	charset := "-ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	b := make([]byte, length, length)
+
+	for i := range b {
+		b[i] = charset[i%len(charset)]
+	}
+
+	if length > 0 {
+		b[0] = '|'
+		b[length-1] = '|'
+	}
+
+	return bytes.NewReader(b)
 }

build.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-CGO_ENABLED=0 go build -a --installsuffix cgo --ldflags="-s" -o whoamI
-docker build -t emilevauge/whoami .

go.mod

@@ -0,0 +1,5 @@
+module github.com/containous/whoami
+
+go 1.12
+
+require github.com/gorilla/websocket v1.2.0

go.sum

@@ -0,0 +1,2 @@
+github.com/gorilla/websocket v1.2.0 h1:VJtLvh6VQym50czpZzx07z/kw9EgAxI3x1ZB8taTMQQ=
+github.com/gorilla/websocket v1.2.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=