virtigod/http.go

package main

import (
	"errors"
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"strings"

	"libvirt.org/go/libvirtxml"

	"go.wit.com/lib/gui/shell"
	pb "go.wit.com/lib/protobuf/virtbuf"
	"go.wit.com/log"
	"go.wit.com/lib/virtigolib"
)

// remove '?' part and trailing '/'
func cleanURL(url string) string {
	url = "/" + strings.Trim(url, "/")
	return url
}

func okHandler(w http.ResponseWriter, r *http.Request) {
	log.Info("Got URL Path: ", r.URL.Path)
	route := cleanURL(r.URL.Path)

	msg, err := ioutil.ReadAll(r.Body) // Read the body as []byte
	if err != nil {
		fmt.Fprintln(w, "ReadAll() error =", err)
		return
	}

	log.Info("Got URL msg:", string(msg))
	if route == "/" {
		fmt.Fprintln(w, "OK")
		return
	}

	// curl http://localhost:2520/dumpdomain?domain=foo.bar.com
	if route == "/dumpdomain" {
		domname := r.URL.Query().Get("domain")
		fmt.Fprint(w, "import domain:", domname)

		xmldoc, err := virshDumpXML(domname)

		domcfg := &libvirtxml.Domain{}
		fmt.Fprintln(w, "domcfg.Unmarshal()")
		fmt.Fprintln(w, "domcfg.Unmarshal()")
		fmt.Fprintln(w, "domcfg.Unmarshal()")
		log.Warn("domcfg.Unmarshal()")
		err = domcfg.Unmarshal(xmldoc)
		if err != nil {
			fmt.Fprintln(w, "domain.Unmarshal XML failed")
			fmt.Fprintln(w, "error =", err)
			return
		}
		d, err := virtigolib.TestLibvirtDomain(domcfg)
		if err != nil {
			fmt.Fprintln(w, "ImportXML failed for", domname, err)
			return
		}
		if d == nil {
			fmt.Fprintln(w, "ImportXML failed d == nil", err)
			return
		}
		fmt.Fprintln(w, "ImportXML worked for", domname)
		fmt.Fprintln(w, "should send the protobuf to virtigo here", domname)
		log.Warn("About to DumpDroplet()")
		d.DumpDroplet(w, r)
		fmt.Fprintln(w, "DUMP DOMAIN DONE OK FOR", domname)
		return
	}

	if route == "/vms" {
		s := pollHypervisor(me.hv)
		fmt.Fprint(w, s)
		return
	}

	// exit the virtigo daemon & have systemd restart it
	// this can happen & when it does, access to
	// to libvirtd will hang (aka: virsh list will hang)
	// One way to trigger this is to not properly close
	// domain sockets opened from go-qemu/hypervisor
	// it's a good idea in any case so leave it here
	if route == "/kill" {
		log.Warn("KILLED")
		fmt.Fprintln(w, "KILLED")
		os.Exit(-1)
		return
	}

	// curl http://localhost:2520/import?domain=foo.bar.com
	if route == "/import" {
		domname := r.URL.Query().Get("domain")
		// fmt.Fprint(w, "import domain:", domname)

		xmldoc, err := virshDumpXML(domname)
		if err != nil {
			fmt.Fprintln(w, err)
			return
		}
		fmt.Fprintln(w, xmldoc)
		return

		/*
			domcfg := &libvirtxml.Domain{}
			err = domcfg.Unmarshal(xmldoc)
			if err != nil {
				fmt.Fprintln(w, "domain.Unmarshal XML failed")
				fmt.Fprintln(w, "error =", err)
				return
			}
			// importDomain(w, r, domcfg)
			// importDomain(w http.ResponseWriter, r *http.Request, dom *libvirtxml.Domain) {
			xml, _, err := virtigolib.ImportXML(domcfg)
			if err != nil {
				fmt.Fprintln(w, "ImportXML failed for", domname, err)
				return
			}
			log.Warn("ImportXML worked for", domname)
			fmt.Fprintln(w, xml)
			// d.Current.FullXml = xmldoc
		*/
		return
	}

	if route == "/start" {
		log.Info("/start jcarr actually doing START", me.Hostname)
		fmt.Fprintln(w, "/start jcarr actually doing START", me.Hostname)
		start := r.URL.Query().Get("start")
		xml := "/tmp/" + start + ".xml"
		if shell.Unlink(xml) {
			fmt.Fprintln(w, "START FAILED", me.Hostname)
			fmt.Fprintln(w, "error =", "could not remove existing xml file", xml)
			fmt.Fprintln(w, "error =", "file still exists after unlink")
			return
		}
		// fmt.Fprintln(w, "HTTP:", r.Body)
		var d *pb.Droplet
		d = new(pb.Droplet)
		// msg, err := ioutil.ReadAll(r.Body) // Read the body as []byte
		fmt.Fprintln(w, "/start ReadAll() START")
		fmt.Fprintln(w, "msg =", string(msg))
		fmt.Fprintln(w, "/start ReadAll() END")
		if err != nil {
			fmt.Fprintln(w, "START FAILED", me.Hostname)
			fmt.Fprintln(w, "error =", err)
			return
		}
		fmt.Fprintln(w, "START len(msg) =", len(msg))
		err = d.UnmarshalJSON(msg)
		if d.Hostname == "" {
			fmt.Fprintln(w, "START hostname is blank", me.Hostname)
			log.Info("START hostname is blank")
			return
		}

		if err != nil {
			fmt.Fprintln(w, "START FAILED", me.Hostname)
			fmt.Fprintln(w, "error =", err)
		}

		if err := newStart(start, d); err != nil {
			fmt.Fprintln(w, "START FAILED", me.Hostname)
			fmt.Fprintln(w, "error =", err)
			return
		}
		cmd := []string{"virsh", "create", xml}

		log.Warn("cmd :", cmd)
		fmt.Fprintln(w, "Handling start droplet", cmd)

		err, ok, output := shell.RunCmd("/home/", cmd)
		shell.Run(cmd)
		if ok {
			fmt.Fprintln(w, "START OK", me.Hostname)
			fmt.Fprintln(w, output)
		} else {
			fmt.Fprintln(w, "START FAILED", me.Hostname)
			fmt.Fprintln(w, "error =", err)
			fmt.Fprintln(w, "output =", output)
		}
		return
	}

	if route == "/favicon.ico" {
		writeFile(w, "ipv6.png")
		return
	}

	log.Warn("BAD URL =", route)
	fmt.Fprintln(w, "BAD URL =", route)
}

func writeFile(w http.ResponseWriter, filename string) {
	// fmt.Fprintln(w, "GOT TEST?")
	fullname := "resources/" + filename
	pfile, err := resources.ReadFile(fullname)
	if err != nil {
		log.Println("ERROR:", err)
		// w.Write(pfile)
		return
	}

	var repohtml string
	repohtml = string(pfile)
	if filename == "goReference.svg" {
		w.Header().Set("Content-Type", "image/svg+xml")
	}
	fmt.Fprintln(w, repohtml)
	log.Println("writeFile() found internal file:", filename)
}

// starts and sits waiting for HTTP requests
func startHTTP() {
	http.HandleFunc("/", okHandler)

	p := fmt.Sprintf(":%d", argv.Port)
	log.Println("Running on port", p)

	err := http.ListenAndServe(p, nil)
	if err != nil {
		log.Println("Error starting server:", err)
	}
}

func virshDumpXML(name string) (string, error) {
	cmd := []string{"virsh", "dumpxml", "--security-info", name}

	log.Warn("Running:", cmd)
	err, ok, output := shell.RunCmd("/home/", cmd)
	shell.Run(cmd)
	if !ok {
		result := fmt.Sprintln(cmd, "failed:", err)
		log.Warn(result)
		return output, errors.New(result)
	}
	log.Warn(cmd, "OK")
	return output, nil
}