vhive.go

// MIT License
//
// Copyright (c) 2020 Dmitrii Ustiugov, Plamen Petrov and EASE lab
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package main

import (
	"context"
	"flag"
	"fmt"

	"math/rand"
	"net"
	"os"
	"runtime"

	ctrdlog "github.com/containerd/containerd/log"
	log "github.com/sirupsen/logrus"
	"github.com/vhive-serverless/vhive/cri"
	fccri "github.com/vhive-serverless/vhive/cri/firecracker"
	gvcri "github.com/vhive-serverless/vhive/cri/gvisor"
	ctriface "github.com/vhive-serverless/vhive/ctriface"
	hpb "github.com/vhive-serverless/vhive/examples/protobuf/helloworld"
	pb "github.com/vhive-serverless/vhive/proto"
	"google.golang.org/grpc"
)

const (
	port    = ":3333"
	fwdPort = ":3334"

	testImageName = "ghcr.io/ease-lab/helloworld:var_workload"
)

var (
	flog     *os.File
	orch     *ctriface.Orchestrator
	funcPool *FuncPool

	isSaveMemory       *bool
	isSnapshotsEnabled *bool
	isUPFEnabled       *bool
	isLazyMode         *bool
	isMetricsMode      *bool
	servedThreshold    *uint64
	pinnedFuncNum      *int
	criSock            *string
	hostIface          *string
)

func main() {
	var err error
	runtime.GOMAXPROCS(16)

	rand.Seed(42)
	snapshotter := flag.String("ss", "devmapper", "snapshotter name")
	debug := flag.Bool("dbg", false, "Enable debug logging")

	isSaveMemory = flag.Bool("ms", false, "Enable memory saving")
	isSnapshotsEnabled = flag.Bool("snapshots", false, "Use VM snapshots when adding function instances")
	isUPFEnabled = flag.Bool("upf", false, "Enable user-level page faults guest memory management")
	isMetricsMode = flag.Bool("metrics", false, "Calculate UPF metrics")
	servedThreshold = flag.Uint64("st", 1000*1000, "Functions serves X RPCs before it shuts down (if saveMemory=true)")
	pinnedFuncNum = flag.Int("hn", 0, "Number of functions pinned in memory (IDs from 0 to X)")
	isLazyMode = flag.Bool("lazy", false, "Enable lazy serving mode when UPFs are enabled")
	criSock = flag.String("criSock", "/etc/vhive-cri/vhive-cri.sock", "Socket address for CRI service")
	hostIface = flag.String("hostIface", "", "Host net-interface for the VMs to bind to for internet access")
	sandbox := flag.String("sandbox", "firecracker", "Sandbox tech to use, valid options: firecracker, gvisor")
	flag.Parse()

	if *sandbox != "firecracker" && *sandbox != "gvisor" {
		log.Fatalln("Only \"gvisor\" or \"firecracker\" are supported as sandboxing-techniques")
		return
	}

	if *isUPFEnabled && !*isSnapshotsEnabled {
		log.Error("User-level page faults are not supported without snapshots")
		return
	}

	if !*isUPFEnabled && *isLazyMode {
		log.Error("Lazy page fault serving mode is not supported without user-level page faults")
		return
	}

	if flog, err = os.Create("/tmp/fccd.log"); err != nil {
		panic(err)
	}
	defer flog.Close()

	log.SetFormatter(&log.TextFormatter{
		TimestampFormat: ctrdlog.RFC3339NanoFixed,
		FullTimestamp:   true,
	})
	//log.SetReportCaller(true) // FIXME: make sure it's false unless debugging

	log.SetOutput(os.Stdout)

	if *debug {
		log.SetLevel(log.DebugLevel)
		log.Debug("Debug logging is enabled")
	} else {
		log.SetLevel(log.InfoLevel)
	}

	if *isSaveMemory {
		log.Info(fmt.Sprintf("Creating orchestrator for pinned=%d functions", *pinnedFuncNum))
	}

	switch *sandbox {
	case "firecracker":
		testModeOn := false
		orch = ctriface.NewOrchestrator(
			*snapshotter,
			*hostIface,
			ctriface.WithTestModeOn(testModeOn),
			ctriface.WithSnapshots(*isSnapshotsEnabled),
			ctriface.WithUPF(*isUPFEnabled),
			ctriface.WithMetricsMode(*isMetricsMode),
			ctriface.WithLazyMode(*isLazyMode),
		)
		funcPool = NewFuncPool(*isSaveMemory, *servedThreshold, *pinnedFuncNum, testModeOn)
		go setupFirecrackerCRI()
		go orchServe()
		fwdServe()
	case "gvisor":
		setupGVisorCRI()
	}
}

type server struct {
	pb.UnimplementedOrchestratorServer
}

type fwdServer struct {
	hpb.UnimplementedFwdGreeterServer
}

func setupFirecrackerCRI() {
	lis, err := net.Listen("unix", *criSock)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}

	s := grpc.NewServer()

	fcService, err := fccri.NewFirecrackerService(orch)
	if err != nil {
		log.Fatalf("failed to create firecracker service %v", err)
	}

	criService, err := cri.NewService(fcService)
	if err != nil {
		log.Fatalf("failed to create CRI service %v", err)
	}

	criService.Register(s)

	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

func orchServe() {
	lis, err := net.Listen("tcp", port)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	pb.RegisterOrchestratorServer(s, &server{})

	log.Println("Listening on port" + port)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

func fwdServe() {
	lis, err := net.Listen("tcp", fwdPort)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}
	s := grpc.NewServer()
	hpb.RegisterFwdGreeterServer(s, &fwdServer{})

	log.Println("Listening on port" + fwdPort)
	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}

// StartVM, StopSingleVM and StopVMs are legacy functions that manage functions and VMs
// Should be used only to bootstrap an experiment (e.g., quick parallel start of many functions)
func (s *server) StartVM(ctx context.Context, in *pb.StartVMReq) (*pb.StartVMResp, error) {
	fID := in.GetId()
	imageName := in.GetImage()
	log.WithFields(log.Fields{"fID": fID, "image": imageName}).Info("Received direct StartVM")

	tProfile := "not supported anymore"

	_, _, err := funcPool.Serve(ctx, fID, imageName, "record")
	if err != nil {
		return &pb.StartVMResp{Message: "First serve failed", Profile: tProfile}, err
	}

	return &pb.StartVMResp{Message: "started VM instance for a function " + fID, Profile: tProfile}, nil
}

func (s *server) StopSingleVM(ctx context.Context, in *pb.StopSingleVMReq) (*pb.Status, error) {
	fID := in.GetId()
	isSync := true
	log.WithFields(log.Fields{"fID": fID}).Info("Received direct StopVM")
	message, err := funcPool.RemoveInstance(fID, "bogus imageName", isSync)
	if err != nil {
		log.Warn(message, err)
	}

	return &pb.Status{Message: message}, err
}

// Note: this function is to be used only before tearing down the whole orchestrator
func (s *server) StopVMs(ctx context.Context, in *pb.StopVMsReq) (*pb.Status, error) {
	log.Info("Received StopVMs")
	err := orch.StopActiveVMs()
	if err != nil {
		log.Printf("Failed to stop VMs, err: %v\n", err)
		return &pb.Status{Message: "Failed to stop VMs"}, err
	}
	os.Exit(0)
	return &pb.Status{Message: "Stopped VMs"}, nil
}

func (s *fwdServer) FwdHello(ctx context.Context, in *hpb.FwdHelloReq) (*hpb.FwdHelloResp, error) {
	fID := in.GetId()
	imageName := in.GetImage()
	payload := in.GetPayload()

	logger := log.WithFields(log.Fields{"fID": fID, "image": imageName, "payload": payload})
	logger.Debug("Received FwdHelloVM")

	resp, _, err := funcPool.Serve(ctx, fID, imageName, payload)
	return resp, err
}

func setupGVisorCRI() {
	lis, err := net.Listen("unix", *criSock)
	if err != nil {
		log.Fatalf("failed to listen: %v", err)
	}

	s := grpc.NewServer()

	gvService, err := gvcri.NewGVisorService()
	if err != nil {
		log.Fatalf("failed to create gVisor service %v", err)
	}

	criService, err := cri.NewService(gvService)
	if err != nil {
		log.Fatalf("failed to create CRI service %v", err)
	}

	criService.Register(s)

	if err := s.Serve(lis); err != nil {
		log.Fatalf("failed to serve: %v", err)
	}
}