Add proxy info to './weave status' output

proxy/proxy.go

@@ -1,6 +1,8 @@
 package proxy
 
 import (
+	"bytes"
+	"fmt"
 	"net"
 	"net/http"
 	"net/url"
@@ -19,14 +21,17 @@ var (
 
 type Proxy struct {
 	Dial           func() (net.Conn, error)
+	version        string
 	client         *docker.Client
+	dockerAddr     string
+	listenAddr     string
 	withDNS        bool
 	dockerBridgeIP string
 	withIPAM       bool
 }
 
-func NewProxy(targetURL string, withDNS, withIPAM bool) (*Proxy, error) {
-	u, err := url.Parse(targetURL)
+func NewProxy(version, dockerAddr, listenAddr string, withDNS, withIPAM bool) (*Proxy, error) {
+	u, err := url.Parse(dockerAddr)
 	if err != nil {
 		return nil, err
 	}
@@ -39,7 +44,7 @@ func NewProxy(targetURL string, withDNS, withIPAM bool) (*Proxy, error) {
 		}
 	}
 
-	client, err := docker.NewClient(targetURL)
+	client, err := docker.NewClient(dockerAddr)
 	if err != nil {
 		return nil, err
 	}
@@ -56,7 +61,10 @@ func NewProxy(targetURL string, withDNS, withIPAM bool) (*Proxy, error) {
 		Dial: func() (net.Conn, error) {
 			return net.Dial(u.Scheme, targetAddr)
 		},
+		version:        version,
 		client:         client,
+		dockerAddr:     dockerAddr,
+		listenAddr:     listenAddr,
 		withDNS:        withDNS,
 		dockerBridgeIP: string(dockerBridgeIP),
 		withIPAM:       withIPAM,
@@ -74,7 +82,8 @@ func (proxy *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case execCreateRegexp.MatchString(path):
 		proxy.serveWithInterceptor(&createExecInterceptor{proxy.client, proxy.withIPAM}, w, r)
 	case strings.HasPrefix(path, "/status"):
-		w.WriteHeader(http.StatusOK)
+		fmt.Fprintln(w, "weave proxy", proxy.version)
+		fmt.Fprintln(w, proxy.Status())
 	default:
 		proxy.serveWithInterceptor(&nullInterceptor{}, w, r)
 	}
@@ -83,3 +92,28 @@ func (proxy *Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 func (proxy *Proxy) serveWithInterceptor(i interceptor, w http.ResponseWriter, r *http.Request) {
 	newClient(proxy.Dial, i).ServeHTTP(w, r)
 }
+
+// Return status string
+func (proxy *Proxy) Status() string {
+	var buf bytes.Buffer
+	fmt.Fprintln(&buf, "Listen address is", proxy.listenAddr)
+	fmt.Fprintln(&buf, "Docker address is", proxy.dockerAddr)
+	if proxy.withDNS {
+		fmt.Fprintln(&buf, "DNS on")
+	} else {
+		fmt.Fprintln(&buf, "DNS off")
+	}
+	if proxy.withIPAM {
+		fmt.Fprintln(&buf, "IPAM on")
+	} else {
+		fmt.Fprintln(&buf, "IPAM off")
+	}
+	return buf.String()
+}
+
+func (proxy *Proxy) ListenAndServe() error {
+	return (&http.Server{
+		Addr:    proxy.listenAddr,
+		Handler: proxy,
+	}).ListenAndServe()
+}