chore(dashboard): move dashboard server & fix routing.

mod/dashboard/build

@@ -0,0 +1,18 @@
+#!/bin/bash -e
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd ${DIR}
+git clean -x -f dist
+
+npm install
+bower install
+grunt build
+
+go get github.com/jteeuwen/go-bindata/...
+
+dirs=
+for i in `find dist -type d`; do
+	dirs="${dirs} ${i}"
+done
+
+${GOPATH}/bin/go-bindata -nomemcopy -pkg "resources" -o resources/resources.go -prefix dist ${dirs}

mod/dashboard/dashboard.go

@@ -0,0 +1,61 @@
+package dashboard
+
+import (
+	"bytes"
+	"net/http"
+	"os"
+	"path"
+	"time"
+
+	"github.com/coreos/etcd/log"
+	"github.com/coreos/etcd/mod/dashboard/resources"
+)
+
+func memoryFileServer(w http.ResponseWriter, req *http.Request) {
+	log.Debugf("[recv] %s %s [%s]", req.Method, req.URL.Path, req.RemoteAddr)
+	upath := req.URL.Path
+
+	b, err := resources.Asset(req.URL.Path)
+
+	if err != nil {
+		http.Error(w, upath+": File not found", http.StatusNotFound)
+		return
+	}
+
+	http.ServeContent(w, req, upath, time.Time{}, bytes.NewReader(b))
+	return
+}
+
+func getDashDir() string {
+	return os.Getenv("ETCD_DASHBOARD_DIR")
+}
+
+// DashboardHttpHandler either uses the compiled in virtual filesystem for the
+// dashboard assets or if ETCD_DASHBOARD_DIR is set uses that as the source of
+// assets.
+func HttpHandler() (handler http.Handler) {
+	handler = http.HandlerFunc(memoryFileServer)
+
+	// Serve the dashboard from a filesystem if the magic env variable is enabled
+	dashDir := getDashDir()
+	if len(dashDir) != 0 {
+		log.Debugf("Using dashboard directory %s", dashDir)
+		handler = http.FileServer(http.Dir(dashDir))
+	}
+
+	return handler
+}
+
+// Always returns the index.html page.
+func IndexPage(w http.ResponseWriter, req *http.Request) {
+	dashDir := getDashDir()
+	if len(dashDir) != 0 {
+		// Serve the index page from disk if the env variable is set.
+		http.ServeFile(w, req, path.Join(dashDir, "index.html"))
+	} else {
+		// Otherwise serve it from the compiled resources.
+		b, _ := resources.Asset("index.html")
+		http.ServeContent(w, req, "index.html", time.Time{}, bytes.NewReader(b))
+	}
+	return
+}