zt/zttest/simple-sim/simple-sim.go

/*
	Copyright NetFoundry Inc.

	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

	https://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.
*/

package main

import (
	"fmt"
	"math/rand"
	"os"
	"path/filepath"
	"slices"
	"time"

	"github.com/hanzozt/edge-api/rest_model"
	"github.com/hanzozt/sdk-golang/zt"
	"github.com/hanzozt/zt/v2/common/eid"
	"github.com/michaelquigley/pfxlog"
	cmap "github.com/orcaman/concurrent-map/v2"
	"github.com/sirupsen/logrus"
	"github.com/spf13/cobra"
)

type simpleSimAction struct {
	verbose      bool
	logFormatter string
	configFile   string

	authenticated cmap.ConcurrentMap[string, time.Time]
}

func newSimpleSimCmd() *cobra.Command {
	action := &simpleSimAction{
		authenticated: cmap.New[time.Time](),
	}

	cmd := &cobra.Command{
		Use:   "simple-sim <config file or directory>",
		Short: "Generates traffic to one more zt identities",
		Args:  cobra.ExactArgs(1),
		Run:   action.run,
	}

	// allow interspersing positional args and flags
	cmd.Flags().SetInterspersed(true)
	cmd.Flags().BoolVarP(&action.verbose, "verbose", "v", false, "Enable verbose logging")
	cmd.Flags().StringVar(&action.logFormatter, "log-formatter", "", "Specify log formatter [json|pfxlog|text]")
	cmd.Flags().StringVarP(&action.configFile, "identity", "i", "", "Specify the ZT identity to use. If not specified the ZT listener won't be started")
	cmd.Flags().SetInterspersed(true)

	return cmd
}

func (self *simpleSimAction) initLogging() {
	logLevel := logrus.InfoLevel
	if self.verbose {
		logLevel = logrus.DebugLevel
	}

	options := pfxlog.DefaultOptions().SetTrimPrefix("github.com/hanzozt/").NoColor()
	pfxlog.GlobalInit(logLevel, options)

	switch self.logFormatter {
	case "pfxlog":
		pfxlog.SetFormatter(pfxlog.NewFormatter(pfxlog.DefaultOptions().SetTrimPrefix("github.com/hanzozt/").StartingToday()))
	case "json":
		pfxlog.SetFormatter(&logrus.JSONFormatter{TimestampFormat: "2006-01-02T15:04:05.000Z"})
	case "text":
		pfxlog.SetFormatter(&logrus.TextFormatter{})
	default:
		// let logrus do its own thing
	}
}

func (self *simpleSimAction) run(_ *cobra.Command, args []string) {
	self.initLogging()

	log := pfxlog.Logger()

	fsInfo, err := os.Stat(args[0])
	if err != nil {
		log.WithError(err).Fatalf("unable to stat config file/dir %s", args[0])
		return
	}

	simCount := 0
	if fsInfo.IsDir() {
		files, err := os.ReadDir(args[0])
		if err != nil {
			log.WithError(err).Fatalf("failed to scan directory %s:", args[0])
			return
		}

		for _, file := range files {
			if filepath.Ext(file.Name()) == ".json" {
				fn, err := filepath.Abs(filepath.Join(args[0], file.Name()))
				if err != nil {
					log.Fatalf("failed to listing file %s: %v", file.Name(), err)
				}
				self.startSimForIdentity(fn)
				simCount++
			}
		}
	}

	for {
		time.Sleep(time.Second * 5)
		pfxlog.Logger().Infof("%d/%d identities authenticated", self.authenticated.Count(), simCount)
	}
}

func (self *simpleSimAction) startSimForIdentity(path string) {
	log := pfxlog.Logger().WithField("config", path)

	ztConfig, err := zt.NewConfigFromFile(path)
	if err != nil {
		log.WithError(err).Fatal("unable to load zt identity")
		return
	}

	ztContext, err := zt.NewContext(ztConfig)
	if err != nil {
		log.WithError(err).Fatal("could not create sdk context from config")
	}

	go self.runSim(path, ztContext)
}

func (self *simpleSimAction) runSim(path string, ctx zt.Context) {
	log := pfxlog.Logger().WithField("config", path)

	var lastLog time.Time
	cycle := 0

	for {
		cycle++
		validServices := 0
		dialSuccesses := 0
		services, err := ctx.GetServices()
		if err != nil {
			self.authenticated.Remove(ctx.GetId())
			log.WithField("cycle", cycle).WithError(err).Error("unable to list services")
			time.Sleep(time.Second * 5)
			continue
		} else {
			self.authenticated.Set(ctx.GetId(), time.Now())
		}

		for _, service := range services {
			if !slices.Contains(service.Permissions, rest_model.DialBindDial) {
				continue
			}
			validServices++

			svcLog := log.WithField("svc", *service.Name).WithField("cycle", cycle)
			conn, err := ctx.Dial(*service.Name)
			if err != nil {
				svcLog.WithError(err).Error("unable to dial service")
			} else {
				randomString := eid.New()
				if _, err = conn.Write([]byte(randomString)); err != nil {
					svcLog.WithError(err).Error("unable to write")
				} else {
					result := make([]byte, len(randomString))
					n, err := conn.Read(result)
					if err != nil {
						svcLog.WithError(err).Error("unable to read")
					} else {
						result = result[:n]
						if string(result) != randomString {
							svcLog.WithError(err).Errorf("%s != %s", randomString, result)
						} else {
							dialSuccesses++
						}
					}
				}
			}

			if conn != nil {
				if err = conn.Close(); err != nil {
					svcLog.WithError(err).Error("error closing conn")
				}
				time.Sleep(time.Millisecond * 250)
			}
		}

		if time.Since(lastLog) > time.Minute {
			log.WithField("serviceCount", len(services)).
				WithField("cycle", cycle).
				WithField("successfulDials", fmt.Sprintf("%d/%d", dialSuccesses, validServices)).
				Info("completed")
			lastLog = time.Now()
		}

		time.Sleep(time.Duration(500+rand.Intn(1000)) * time.Second)
	}
}

func main() {
	cli := newSimpleSimCmd()
	if err := cli.Execute(); err != nil {
		pfxlog.Logger().Fatal(err.Error())
	}
}