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watcher.go
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watcher.go
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package main
import (
"bufio"
"context"
"encoding/binary"
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"os"
"strings"
"time"
"github.com/costinm/ugate"
"github.com/costinm/meshauth"
msgs "github.com/costinm/ugate/webpush"
)
// TODO: rewrite using K8s API style
var (
addr = flag.String("addr", "127.0.0.1:15007", "address:port for the node")
watch = flag.Bool("watch", false, "Watch")
recurse = flag.Bool("r", false, "Crawl and watch all possible nodes")
)
var (
verbose = flag.Bool("v", false, "Verbose messages")
)
var hc *http.Client
// Create a HBONE tunnel to a given URL.
//
// Current client is authenticated using local credentials, or a kube.json file. If no kube.json is found, one
// will be generated.
//
// Example:
// ssh -v -o ProxyCommand='wp -nc https://c1.webinf.info:443/dm/PZ5LWHIYFLSUZB7VHNAMGJICH7YVRU2CNFRT4TXFFQSXEITCJUCQ:22' root@PZ5LWHIYFLSUZB7VHNAMGJICH7YVRU2CNFRT4TXFFQSXEITCJUCQ
func main() {
flag.Parse()
//config := meshauth.NewConf("./", "./var/lib/dmesh/")
authz := meshauth.NewMeshAuth(nil).InitSelfSigned("")
ug := ugate.New(authz, nil)
hc = &http.Client{
Transport: ug,
}
watchNodes(ug)
}
// Known nodes and watchers
var watchers = map[uint64]*watcher{}
// Track a single node
type watcher struct {
Node *ugate.MeshCluster
Path []string
// For crawling
dirty bool
base string
ip6 *net.IPAddr
idhex string
New bool
watching bool
}
// Connect to all known nodes and watch them.
// Uses the internal debug endpoint for getting connected nodes,
// and crawls the mesh.
func watchNodes(ug *ugate.UGate) {
ctx := context.Background()
if *recurse {
// Recursive list of all devices in the mesh.
for {
crawl() // Get nodes connected to our parent ( all directions )
if !*watch {
return // Just crawl.
} else {
//if *dev == "*" || *dev == "" {
// go msgs.DefaultMux.MonitorNode(hc, nil, nil)
//}
for _, w := range watchers {
//if w.idhex == *dev || *dev == "*" {
if !w.watching {
w.watching = true
go func() {
log.Println("Watch: ", w.ip6)
ug.DialMUX(ctx, "quic", w.Node, nil)
w.watching = false
log.Println("Watch close: ", w.ip6)
}()
}
}
}
time.Sleep(10 * time.Second)
//select {}
}
return
}
n0 := &ugate.MeshCluster{
Dest: meshauth.Dest{
Addr: *addr,
},
}
ug.DialMUX(ctx, "quic", n0, nil)
}
// Get neighbors from a node. Side effect: updates the watchers table.
func neighbors(url string, path []string) map[uint64]*ugate.MeshCluster {
req, err := http.NewRequest("GET", url, nil)
if err != nil {
log.Print("HTTP_ERROR1", url, err)
return nil
}
ctx, _ := context.WithTimeout(context.Background(), 5*time.Second)
req = req.WithContext(ctx)
hcc := hc
if strings.HasPrefix(url, "http://127") {
hcc = http.DefaultClient
}
res, err := hcc.Do(req)
if err != nil || res.StatusCode != 200 {
log.Println("HTTP_ERROR2", url, err)
return nil
}
cnodes, _ := ioutil.ReadAll(res.Body)
connectedNodes := map[uint64]*ugate.MeshCluster{}
err = json.Unmarshal(cnodes, &connectedNodes)
if err != nil {
log.Println("HTTP_ERROR_RES", url, err, string(cnodes))
return nil
}
if watchers != nil {
peers := []string{}
// Any node that is new, not yet found in the current watched list.
newConnectedNodes := map[uint64]*watcher{}
// Nodes already connected
oldmap := map[uint64]*watcher{}
for k, v := range connectedNodes {
w, f := watchers[k]
if !f {
ip6 := toIP6(k)
w = &watcher{Node: v, dirty: true, ip6: ip6,
idhex: fmt.Sprintf("%x", k),
Path: path}
w.New = true
watchers[k] = w
newConnectedNodes[k] = w
} else {
oldmap[k] = w
}
peers = append(peers, w.idhex)
}
if *verbose {
log.Println("GET", url, len(connectedNodes), peers)
}
}
return connectedNodes
}
// Scan all nodes for neighbors. Watch them if not watched already.
//
// - Will first mark all currently known nodes as 'dirty' and 'old'.
// - For each known node, get a list of connected nodes.
// - For each connected node, if still connected update and set dirty=false
// - If new nodes is found, add it as 'New' and 'dirty'.
//
// - repeat until all nodes are !dirty
// - at the end, the set of nodes that are new will be marked as New.
// -
func crawl() {
for _, v := range watchers {
v.dirty = true
v.New = false
}
// Will update watchers
neighbors("http://127.0.0.1:5227/dmesh/ip6", nil)
more := true
for more {
more = false
for _, v := range watchers {
if !v.dirty {
continue
}
more = true
p := "/"
for _, pp := range v.Path {
p = p + pp + "/"
}
p = p + v.idhex + "/"
//neighbors("http://127.0.0.1:5227/dm"+p+"/c/dmesh/ip6", append(v.Path, v.idhex))
neighbors("http://"+net.JoinHostPort(v.ip6.String(), "5227")+"/dmesh/ip6", append(v.Path, v.idhex))
v.dirty = false
}
}
for _, v := range watchers {
if v.New {
log.Println("Node", v.idhex, v.Path, v.Node.Hosts)
}
}
}
func stdinClient(mux *msgs.Mux) {
stdin := &msgs.MsgConnection{
Name: "",
SubscriptionsToSend: []string{"*"},
SendMessageToRemote: func(ev *msgs.Message) error {
ba := ev.MarshalJSON()
os.Stdout.Write(ba)
os.Stdout.Write([]byte{'\n'})
return nil
},
}
mux.AddConnection("stdin", stdin)
go func() {
br := bufio.NewReader(os.Stdin)
for {
line, _, err := br.ReadLine()
if err != nil {
break
}
if len(line) > 0 && line[0] == '{' {
ev := msgs.ParseJSON(line)
mux.SendMessage(ev)
}
}
}()
}
func toIP6(k uint64) *net.IPAddr {
ip6, _ := net.ResolveIPAddr("ip6", "fd00::")
binary.BigEndian.PutUint64(ip6.IP[8:], k)
return ip6
}
func (w *watcher) monitor(ug *ugate.UGate, addr *net.IPAddr) {
req, err := http.NewRequest("GET", "http://["+addr.String()+"]:5227/debug/events", nil)
if err != nil {
return
}
res, err := hc.Do(req)
if err != nil {
println(addr, "HTTP_ERROR", err)
return
}
rd := bufio.NewReader(res.Body)
for {
l, _, err := rd.ReadLine()
if err != nil {
if err.Error() != "EOF" {
log.Println(addr, "READ ERR", err)
}
break
}
ls := string(l)
if ls == "" || ls == "event: message" {
continue
}
log.Println(addr, ls)
}
}