tasks/common/ringpop/ringpop.go

// The MIT License
//
// Copyright (c) 2020 Temporal Technologies Inc.  All rights reserved.
//
// Copyright (c) 2020 Uber Technologies, Inc.
//
// 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 ringpop

import (
	"crypto/tls"
	"fmt"
	"net"
	"sync"
	"time"

	"github.com/temporalio/ringpop-go"
	"github.com/uber/tchannel-go"

	"go.temporal.io/server/common/config"
	"go.temporal.io/server/common/convert"
	"go.temporal.io/server/common/dynamicconfig"
	"go.temporal.io/server/common/log"
	"go.temporal.io/server/common/log/tag"
	"go.temporal.io/server/common/membership"
	"go.temporal.io/server/common/persistence"
	"go.temporal.io/server/common/rpc/encryption"
)

const (
	defaultMaxJoinDuration = 10 * time.Second
)

var (
	IPV4Localhost = net.IPv4(127, 0, 0, 1)
)

// RingpopFactory implements the RingpopFactory interface
type ringpopFactory struct {
	config         *config.Membership
	channel        *tchannel.Channel
	serviceName    string
	servicePortMap map[string]int
	logger         log.Logger

	membershipMonitor membership.Monitor
	metadataManager   persistence.ClusterMetadataManager
	rpcConfig         *config.RPC
	tlsFactory        encryption.TLSConfigProvider
	dc                *dynamicconfig.Collection

	chOnce  sync.Once
	monOnce sync.Once
}

// NewRingpopFactory builds a ringpop factory conforming
// to the underlying configuration
func NewRingpopFactory(
	rpConfig *config.Membership,
	serviceName string,
	servicePortMap map[string]int,
	logger log.Logger,
	metadataManager persistence.ClusterMetadataManager,
	rpcConfig *config.RPC,
	tlsProvider encryption.TLSConfigProvider,
	dc *dynamicconfig.Collection,
) (*ringpopFactory, error) {
	if err := ValidateRingpopConfig(rpConfig); err != nil {
		return nil, err
	}
	if rpConfig.MaxJoinDuration == 0 {
		rpConfig.MaxJoinDuration = defaultMaxJoinDuration
	}
	return &ringpopFactory{
		config:          rpConfig,
		serviceName:     serviceName,
		servicePortMap:  servicePortMap,
		logger:          logger,
		metadataManager: metadataManager,
		rpcConfig:       rpcConfig,
		tlsFactory:      tlsProvider,
		dc:              dc,
	}, nil
}

// ValidateRingpopConfig validates that ringpop config is parseable and valid
func ValidateRingpopConfig(rpConfig *config.Membership) error {
	if rpConfig.BroadcastAddress != "" && net.ParseIP(rpConfig.BroadcastAddress) == nil {
		return fmt.Errorf("ringpop config malformed `broadcastAddress` param")
	}
	return nil
}

// GetMembershipMonitor return a membership monitor
func (factory *ringpopFactory) GetMembershipMonitor() (membership.Monitor, error) {
	return factory.getMembership()
}

func (factory *ringpopFactory) getMembership() (membership.Monitor, error) {
	var err error
	factory.monOnce.Do(func() {
		if rp, err := ringpop.New("temporal", ringpop.Channel(factory.getTChannel()), ringpop.AddressResolverFunc(factory.broadcastAddressResolver)); err != nil {
			factory.logger.Fatal("Failed to get new ringpop", tag.Error(err))
		} else {
			mrp := membership.NewRingPop(rp, factory.config.MaxJoinDuration, factory.logger)

			factory.membershipMonitor = membership.NewRingpopMonitor(
				factory.serviceName,
				factory.servicePortMap,
				mrp,
				factory.logger,
				factory.metadataManager,
				factory.broadcastAddressResolver,
			)
		}
	})

	return factory.membershipMonitor, err
}

func (factory *ringpopFactory) broadcastAddressResolver() (string, error) {
	return membership.BuildBroadcastHostPort(factory.getTChannel().PeerInfo(), factory.config.BroadcastAddress)
}

func (factory *ringpopFactory) getTChannel() *tchannel.Channel {
	factory.chOnce.Do(func() {
		ringpopServiceName := fmt.Sprintf("%v-ringpop", factory.serviceName)
		ringpopHostAddress := net.JoinHostPort(factory.getListenIP().String(), convert.IntToString(factory.rpcConfig.MembershipPort))
		enableTLS := factory.dc.GetBoolProperty(dynamicconfig.EnableRingpopTLS, false)()

		if enableTLS {
			clientTLSConfig, err := factory.tlsFactory.GetInternodeClientConfig()
			if err != nil {
				factory.logger.Fatal("Failed to get internode TLS client config", tag.Error(err))
			}

			serverTLSConfig, err := factory.tlsFactory.GetInternodeServerConfig()
			if err != nil {
				factory.logger.Fatal("Failed to get internode TLS server config", tag.Error(err))
			}

			listener, err := tls.Listen("tcp", ringpopHostAddress, serverTLSConfig)
			if err != nil {
				factory.logger.Fatal("Failed to start ringpop TLS listener", tag.Error(err), tag.Address(ringpopHostAddress))
			}

			dialer := tls.Dialer{Config: clientTLSConfig}
			tChannel, err := tchannel.NewChannel(ringpopServiceName, &tchannel.ChannelOptions{Dialer: dialer.DialContext})
			if err != nil {
				factory.logger.Fatal("Failed to create ringpop TChannel", tag.Error(err))
			}

			if err := tChannel.Serve(listener); err != nil {
				factory.logger.Fatal("Failed to serve ringpop listener", tag.Error(err), tag.Address(ringpopHostAddress))
			}

			factory.channel = tChannel
		} else {
			listener, err := net.Listen("tcp", ringpopHostAddress)
			if err != nil {
				factory.logger.Fatal("Failed to start ringpop listener", tag.Error(err), tag.Address(ringpopHostAddress))
			}

			tChannel, err := tchannel.NewChannel(ringpopServiceName, &tchannel.ChannelOptions{})
			if err != nil {
				factory.logger.Fatal("Failed to create ringpop TChannel", tag.Error(err))
			}

			if err := tChannel.Serve(listener); err != nil {
				factory.logger.Fatal("Failed to serve ringpop listener", tag.Error(err), tag.Address(ringpopHostAddress))
			}

			factory.channel = tChannel
		}
	})

	return factory.channel
}

func (factory *ringpopFactory) getListenIP() net.IP {
	if factory.rpcConfig.BindOnLocalHost && len(factory.rpcConfig.BindOnIP) > 0 {
		factory.logger.Fatal("ListenIP failed, bindOnLocalHost and bindOnIP are mutually exclusive")
		return nil
	}

	if factory.rpcConfig.BindOnLocalHost {
		return IPV4Localhost
	}

	if len(factory.rpcConfig.BindOnIP) > 0 {
		ip := net.ParseIP(factory.rpcConfig.BindOnIP)
		if ip != nil {
			return ip
		}
		factory.logger.Fatal("ListenIP failed, unable to parse bindOnIP value", tag.Address(factory.rpcConfig.BindOnIP))
		return nil
	}
	ip, err := config.ListenIP()
	if err != nil {
		factory.logger.Fatal("ListenIP failed", tag.Error(err))
		return nil
	}
	return ip
}

// CloseTChannel allows fx Stop hook to close channel
func (factory *ringpopFactory) CloseTChannel() {
	if factory.channel != nil {
		factory.getTChannel().Close()
		factory.channel = nil
	}
}