Fix backend update racing problem with dpvs-agent and healthcheck.

src/VERSION

@@ -1,44 +1,14 @@
 #!/bin/sh
 # program: dpvs
-# Dec 19, 2023 #
+# Mar 12, 2024 #
 ##
-# Features
-# - New tool: **dpvs-agent**, a management daemon tool for dpvs based on OpenAPI.
-# - New tool: **healthcheck**, a service health check daemon tool cooperating with dpvs-agent.
-# - Dpvs: Develop **passive health check** methods for tcp and bidirectional udp backends.
-# - Dpvs: Add supports for **Proxy Protocol** with both v1 and v2 versions.
-# - Dpvs: Add supports for extended statistics of ethernet devices.
-# - Dpvs: Add configuration file and dpip supports for allmulticast setting switch.
-# - Build: Transfer all build configurations to a top-level file `config.mk`.
-# - Containerization: Draft a Dockerfile and a tutorial document to build and run dpvs in container.
-#
 # Bugfixes
-# - Dpvs: Protect toa from source address spoofing attack and increase success ratio for source address delievery via toa.
-# - Dpvs: Adjust tcp window scale in outbound direction for synproxy to improve throughput in bulk upload cases.
-# - Dpvs: Fix timer inaccuracy problem when timing over 524s.
-# - Dpvs: Fix the crash problem caused by ether address list buffer overflow.
-# - Dpvs: Fix the crash problem caused by dividing by zero when bonding slaves attempt to send packets out.
-# - Dpvs: Fix the crash problem caused by inconsistent data structures of `dp_vs_dest_compat` between dpvs and keepalived.
-# - Dpvs: Correct ipo option length for judgement of branching to standalone uoa.
-# - Dpvs: Inhibit setting multicast ether address from slave lcores.
-# - Dpvs: Fix service flag conflicts of synproxy and expire-quiescent.
-# - Dpvs: Fix the chaos use of flag, flags and fwdmode in dest and service structures.
-# - Dpvs: Fix service flush function not usable problem.
-# - Dpvs: Fix invalid port problem when getting verbose information of netif devices.
-# - Dpvs: Use atomic operation to generate packet id for ipv4 header.
-# - Dpvs: Remove fragile implementations of strategy routing for snat.
-# - Dpvs: Remove the stale config item "ipc_msg/unix_domain".
-# - Keepalived: Do not delete and re-add vs/rs to eliminate service disturbances at reload.
-# - Keepalived: Fix a carsh problem caused by missing definition of allowlist/denylist config items.
-# - Ipvsadm: Add `conn-timeout` configuration option for service.
-# - Ipvsadm: Fix the ambiguous use of '-Y' configuration option.
-# - Ipvsadm: Fix icmpv6 configuration option `-1` lost problem..
-# - Ipvsadm: Update help text, including supported schedulers, laddr and allow/deny ip list.
-# - Dpip: Fix line break problem in help message.
-# - Uoa: Enable ipv6 with a macro for uoa example server.
+# - tools: Fix concurrency problem between dpvs-agent and healthcheck in editing realserver .
+# - tools/dpvs-agent: Add the snapshot cache.
+# - tools/healthchech: Fix occasionally arising bad icmp checksum problem for udp and udpping checkers.
 #
 
 export VERSION=1.9
-export RELEASE=6
+export RELEASE=7
 
 echo $VERSION-$RELEASE

src/ipvs/ip_vs_dest.c

@@ -74,6 +74,10 @@ static void __dp_vs_dest_update(struct dp_vs_service *svc,
     int conn_flags;
 
     rte_atomic16_set(&dest->weight, udest->weight);
+    if (udest->flags & DPVS_DEST_F_INHIBITED)
+        dp_vs_dest_set_inhibited(dest);
+    else
+        dp_vs_dest_clear_inhibited(dest);
     conn_flags = udest->conn_flags | DPVS_CONN_F_INACTIVE;
     dest->fwdmode = udest->fwdmode;
     rte_atomic16_set(&dest->conn_flags, conn_flags);

tools/dpvs-agent/cmd/dpvs-agent-server/local_init.go

@@ -32,15 +32,16 @@ func (agent *DpvsAgentServer) LocalLoad(cp *pool.ConnPool, parentLogger hclog.Lo
 		logger = parentLogger.Named("LoadConfigFile")
 	}
 
-	snapshot := settings.ShareSnapshot()
-	if err := snapshot.LoadFrom(settings.LocalConfigFile(), logger); err != nil {
+	nodeSnap := settings.ShareSnapshot()
+	if err := nodeSnap.LoadFrom(settings.LocalConfigFile(), logger); err != nil {
 		return err
 	}
 
-	announcePort := snapshot.NodeSpec.AnnouncePort
-	laddrs := snapshot.NodeSpec.Laddrs
+	announcePort := nodeSnap.NodeSpec.AnnouncePort
+	laddrs := nodeSnap.NodeSpec.Laddrs
 
-	for _, service := range snapshot.Services {
+	for _, snap := range nodeSnap.Snapshot {
+		service := snap.Service
 		// 1> ipvsadm -A vip:port -s wrr
 		vs := types.NewVirtualServerSpec()
 		vs.SetAddr(service.Addr)

tools/dpvs-agent/cmd/ipvs/delete_vs_vip_port.go

@@ -45,14 +45,21 @@ func (h *delVsItem) Handle(params apiVs.DeleteVsVipPortParams) middleware.Respon
 		return apiVs.NewDeleteVsVipPortFailure()
 	}
 
+	shareSnapshot := settings.ShareSnapshot()
+	snapshot := shareSnapshot.SnapshotGet(params.VipPort)
+	if snapshot != nil {
+		snapshot.Lock()
+		defer snapshot.Unlock()
+	}
+
 	result := vs.Del(h.connPool, h.logger)
 	switch result {
 	case types.EDPVS_OK:
-		settings.ShareSnapshot().ServiceDel(params.VipPort)
+		shareSnapshot.ServiceDel(params.VipPort)
 		h.logger.Info("Del virtual server success.", "VipPort", params.VipPort)
 		return apiVs.NewDeleteVsVipPortOK()
 	case types.EDPVS_NOTEXIST:
-		settings.ShareSnapshot().ServiceDel(params.VipPort)
+		shareSnapshot.ServiceDel(params.VipPort)
 		h.logger.Warn("Del a not exist virtual server done.", "VipPort", params.VipPort, "result", result.String())
 		return apiVs.NewDeleteVsVipPortNotFound()
 	default:

tools/dpvs-agent/cmd/ipvs/get_vs.go

@@ -40,18 +40,28 @@ func NewGetVs(cp *pool.ConnPool, parentLogger hclog.Logger) *getVs {
 }
 
 func (h *getVs) Handle(params apiVs.GetVsParams) middleware.Responder {
+	shareSnapshot := settings.ShareSnapshot()
+	if params.Healthcheck != nil && !*params.Healthcheck {
+		return apiVs.NewGetVsOK().WithPayload(shareSnapshot.GetModels(h.logger))
+	}
+
+	// if params.Snapshot != nil && *params.Snapshot {
+	//	shareSnapshot.DumpTo(settings.LocalConfigFile(), h.logger)
+	// }
+
 	front := types.NewVirtualServerFront()
 	vss, err := front.Get(h.connPool, h.logger)
 	if err != nil {
 		h.logger.Error("Get virtual server list failed.", "Error", err.Error())
-		// FIXME: Invalid
-		return apiVs.NewGetVsOK()
+		return apiVs.NewGetVsNoContent()
 	}
 
-	shareSnapshot := settings.ShareSnapshot()
+	vsModels := models.VirtualServerList{
+		Items: make([]*models.VirtualServerSpecExpand, len(vss)),
+	}
 
 	h.logger.Info("Get all virtual server done.", "vss", vss)
-	for _, vs := range vss {
+	for i, vs := range vss {
 		front := types.NewRealServerFront()
 
 		err := front.ParseVipPortProto(vs.ID())
@@ -69,45 +79,18 @@ func (h *getVs) Handle(params apiVs.GetVsParams) middleware.Responder {
 
 		h.logger.Info("Get real server list of virtual server success.", "ID", vs.ID(), "rss", rss)
 
-		vsModel := vs.GetModel()
-		vsStats := (*types.ServerStats)(vsModel.Stats)
-		vsModel.RSs = new(models.RealServerExpandList)
-		vsModel.RSs.Items = make([]*models.RealServerSpecExpand, len(rss))
+		vsModels.Items[i] = vs.GetModel()
+		vsStats := (*types.ServerStats)(vsModels.Items[i].Stats)
+		vsModels.Items[i].RSs = new(models.RealServerExpandList)
+		vsModels.Items[i].RSs.Items = make([]*models.RealServerSpecExpand, len(rss))
 
 		for j, rs := range rss {
 			rsModel := rs.GetModel()
 			rsStats := (*types.ServerStats)(rsModel.Stats)
-			vsModel.RSs.Items[j] = rsModel
+			vsModels.Items[i].RSs.Items[j] = rsModel
 			vsStats.Increase(rsStats)
 		}
-
-		if shareSnapshot.NodeSpec.Laddrs == nil {
-			laddr := types.NewLocalAddrFront()
-			if err := laddr.ParseVipPortProto(vs.ID()); err != nil {
-				// FIXME: Invalid
-				return apiVs.NewGetVsOK()
-			}
-
-			laddrs, err := laddr.Get(h.connPool, h.logger)
-			if err != nil {
-				// FIXME: Invalid
-				return apiVs.NewGetVsOK()
-			}
-
-			shareSnapshot.NodeSpec.Laddrs = new(models.LocalAddressExpandList)
-			laddrModels := shareSnapshot.NodeSpec.Laddrs
-			laddrModels.Items = make([]*models.LocalAddressSpecExpand, len(laddrs))
-			for k, lip := range laddrs {
-				laddrModels.Items[k] = lip.GetModel()
-			}
-		}
-
-		shareSnapshot.ServiceUpsert(vsModel)
-	}
-
-	if params.Snapshot != nil && *params.Snapshot {
-		shareSnapshot.DumpTo(settings.LocalConfigFile(), h.logger)
 	}
 
-	return apiVs.NewGetVsOK().WithPayload(shareSnapshot.GetModels(h.logger))
+	return apiVs.NewGetVsOK().WithPayload(&vsModels)
 }

tools/dpvs-agent/cmd/ipvs/get_vs_vip_port.go

@@ -15,6 +15,8 @@
 package ipvs
 
 import (
+	"strings"
+
 	"github.com/dpvs-agent/models"
 	"github.com/dpvs-agent/pkg/ipc/pool"
 	"github.com/dpvs-agent/pkg/ipc/types"
@@ -40,10 +42,33 @@ func NewGetVsVipPort(cp *pool.ConnPool, parentLogger hclog.Logger) *getVsVipPort
 }
 
 func (h *getVsVipPort) Handle(params apiVs.GetVsVipPortParams) middleware.Responder {
+	shareSnapshot := settings.ShareSnapshot()
+	if params.Healthcheck != nil && !*params.Healthcheck {
+		vsModel := shareSnapshot.ServiceGet(params.VipPort)
+		if vsModel != nil {
+			vsModels := new(models.VirtualServerList)
+			vsModels.Items = make([]*models.VirtualServerSpecExpand, 1)
+			vsModels.Items[0] = vsModel
+			return apiVs.NewGetVsVipPortOK().WithPayload(vsModels)
+		}
+	}
+
+	vaild := true
 	var vss []*types.VirtualServerSpec
 	spec := types.NewVirtualServerSpec()
 	err := spec.ParseVipPortProto(params.VipPort)
 	if err != nil {
+		vaild = false
+		if params.Healthcheck != nil && !*params.Healthcheck {
+			// invalid VipPort string
+			// respond full cache info
+			vsModels := shareSnapshot.GetModels(h.logger)
+			if len(vsModels.Items) != 0 {
+				return apiVs.NewGetVsVipPortOK().WithPayload(vsModels)
+			}
+			// read from dpvs memory
+		}
+
 		h.logger.Warn("Convert to virtual server failed. Get All virtual server.", "VipPort", params.VipPort, "Error", err.Error())
 		front := types.NewVirtualServerFront()
 		vss, err = front.Get(h.connPool, h.logger)
@@ -56,10 +81,9 @@ func (h *getVsVipPort) Handle(params apiVs.GetVsVipPortParams) middleware.Respon
 		return apiVs.NewGetVsVipPortNotFound()
 	}
 
-	shareSnapshot := settings.ShareSnapshot()
-
-	vsModels := new(models.VirtualServerList)
-	vsModels.Items = make([]*models.VirtualServerSpecExpand, len(vss))
+	vsModels := &models.VirtualServerList{
+		Items: make([]*models.VirtualServerSpecExpand, len(vss)),
+	}
 
 	for i, vs := range vss {
 		front := types.NewRealServerFront()
@@ -80,20 +104,32 @@ func (h *getVsVipPort) Handle(params apiVs.GetVsVipPortParams) middleware.Respon
 		h.logger.Info("Get real server list of virtual server success.", "ID", vs.ID(), "rss", rss)
 
 		vsModel := vs.GetModel()
-		shareSnapshot.ServiceUpsert(vsModel)
-		// vsModel.Version = shareSnapshot.ServiceVersion(vs.ID())
 		vsModels.Items[i] = vsModel
-		vsStats := (*types.ServerStats)(vsModels.Items[i].Stats)
-		vsModels.Items[i].RSs = new(models.RealServerExpandList)
-		vsModels.Items[i].RSs.Items = make([]*models.RealServerSpecExpand, len(rss))
+		vsStats := (*types.ServerStats)(vsModel.Stats)
+		vsModel.RSs = new(models.RealServerExpandList)
+		vsModel.RSs.Items = make([]*models.RealServerSpecExpand, len(rss))
 
 		for j, rs := range rss {
 			rsModel := rs.GetModel()
 			rsStats := (*types.ServerStats)(rsModel.Stats)
-			vsModels.Items[i].RSs.Items[j] = rsModel
+			vsModel.RSs.Items[j] = rsModel
 			vsStats.Increase(rsStats)
 		}
 	}
 
+	if vaild {
+		targetModels := &models.VirtualServerList{
+			Items: make([]*models.VirtualServerSpecExpand, 1),
+		}
+
+		for _, vsModel := range vsModels.Items {
+			typesVsModel := (*types.VirtualServerSpecExpandModel)(vsModel)
+			if strings.EqualFold(spec.ID(), typesVsModel.ID()) {
+				targetModels.Items[0] = vsModel
+				return apiVs.NewGetVsVipPortOK().WithPayload(targetModels)
+			}
+		}
+	}
+
 	return apiVs.NewGetVsVipPortOK().WithPayload(vsModels)
 }

tools/dpvs-agent/cmd/ipvs/post_vs_vip_port_rs.go

@@ -15,7 +15,9 @@
 package ipvs
 
 import (
-	// "github.com/dpvs-agent/models"
+	"strings"
+
+	"github.com/dpvs-agent/models"
 	"github.com/dpvs-agent/pkg/ipc/pool"
 	"github.com/dpvs-agent/pkg/ipc/types"
 	"github.com/dpvs-agent/pkg/settings"
@@ -46,6 +48,10 @@ func (h *postVsRs) Handle(params apiVs.PostVsVipPortRsParams) middleware.Respond
 		return apiVs.NewPostVsVipPortRsInvalidFrontend()
 	}
 
+	if params.Rss == nil || params.Rss.Items == nil {
+		return apiVs.NewPostVsVipPortRsInvalidFrontend()
+	}
+
 	rss := make([]*types.RealServerSpec, len(params.Rss.Items))
 	for i, rs := range params.Rss.Items {
 		var fwdmode types.DpvsFwdMode
@@ -56,15 +62,58 @@ func (h *postVsRs) Handle(params apiVs.PostVsVipPortRsParams) middleware.Respond
 		rss[i].SetWeight(uint32(rs.Weight))
 		rss[i].SetProto(front.GetProto())
 		rss[i].SetAddr(rs.IP)
-		rss[i].SetInhibited(rs.Inhibited)
 		rss[i].SetOverloaded(rs.Overloaded)
 		rss[i].SetFwdMode(fwdmode)
+		// NOTE: inhibited set by healthcheck module with API /vs/${ID}/rs/health only
+		// we clear it default
+		inhibited := false
+		if rs.Inhibited != nil {
+			inhibited = *rs.Inhibited
+		}
+		rss[i].SetInhibited(&inhibited)
+	}
+
+	shareSnapshot := settings.ShareSnapshot()
+	if shareSnapshot.ServiceLock(params.VipPort) {
+		defer shareSnapshot.ServiceUnlock(params.VipPort)
 	}
 
 	result := front.Update(rss, h.connPool, h.logger)
 	switch result {
 	case types.EDPVS_EXIST, types.EDPVS_OK:
-		settings.ShareSnapshot().ServiceVersionUpdate(params.VipPort, h.logger)
+		// Update Snapshot
+		vsModel := shareSnapshot.ServiceGet(params.VipPort)
+		if vsModel == nil {
+			spec := types.NewVirtualServerSpec()
+			err := spec.ParseVipPortProto(params.VipPort)
+			if err != nil {
+				h.logger.Warn("Convert to virtual server failed.", "VipPort", params.VipPort, "Error", err.Error())
+				// FIXME return
+			}
+			vss, err := spec.Get(h.connPool, h.logger)
+			if err != nil {
+				h.logger.Error("Get virtual server failed.", "svc VipPort", params.VipPort, "Error", err.Error())
+				// FIXME return
+			}
+
+			for _, vs := range vss {
+				if strings.EqualFold(vs.ID(), spec.ID()) {
+					shareSnapshot.ServiceAdd(vs)
+					break
+				}
+			}
+		} else {
+			vsModel.RSs = &models.RealServerExpandList{
+				Items: make([]*models.RealServerSpecExpand, len(rss)),
+			}
+
+			for i, rs := range rss {
+				vsModel.RSs.Items[i] = rs.GetModel()
+			}
+		}
+
+		shareSnapshot.ServiceVersionUpdate(params.VipPort, h.logger)
+
 		h.logger.Info("Set real server to virtual server success.", "VipPort", params.VipPort, "rss", rss, "result", result.String())
 		return apiVs.NewPostVsVipPortRsOK()
 	default: