Golang Database.Remove方法代碼示例

func updatePlacements(view db.Database, spec stitch.Stitch) {
	var placements db.PlacementSlice
	for _, sp := range spec.Placements {
		placements = append(placements, db.Placement{
			TargetLabel: sp.TargetLabel,
			Exclusive:   sp.Exclusive,
			OtherLabel:  sp.OtherLabel,
			Provider:    sp.Provider,
			Size:        sp.Size,
			Region:      sp.Region,
		})
	}

	key := func(val interface{}) interface{} {
		p := val.(db.Placement)
		p.ID = 0
		return p
	}

	dbPlacements := db.PlacementSlice(view.SelectFromPlacement(nil))
	_, addSet, removeSet := join.HashJoin(placements, dbPlacements, key, key)

	for _, toAddIntf := range addSet {
		toAdd := toAddIntf.(db.Placement)

		id := view.InsertPlacement().ID
		toAdd.ID = id
		view.Commit(toAdd)
	}

	for _, toRemove := range removeSet {
		view.Remove(toRemove.(db.Placement))
	}
}

func updateConnections(view db.Database, spec stitch.Stitch) {
	scs, vcs := stitch.ConnectionSlice(spec.Connections),
		view.SelectFromConnection(nil)

	dbcKey := func(val interface{}) interface{} {
		c := val.(db.Connection)
		return stitch.Connection{
			From:    c.From,
			To:      c.To,
			MinPort: c.MinPort,
			MaxPort: c.MaxPort,
		}
	}

	pairs, stitches, dbcs := join.HashJoin(scs, db.ConnectionSlice(vcs), nil, dbcKey)

	for _, dbc := range dbcs {
		view.Remove(dbc.(db.Connection))
	}

	for _, stitchc := range stitches {
		pairs = append(pairs, join.Pair{L: stitchc, R: view.InsertConnection()})
	}

	for _, pair := range pairs {
		stitchc := pair.L.(stitch.Connection)
		dbc := pair.R.(db.Connection)

		dbc.From = stitchc.From
		dbc.To = stitchc.To
		dbc.MinPort = stitchc.MinPort
		dbc.MaxPort = stitchc.MaxPort
		view.Commit(dbc)
	}
}

func updatePlacements(view db.Database, spec stitch.Stitch) {
	stitchPlacements := toDBPlacements(spec.QueryPlacements())
	key := func(val interface{}) interface{} {
		pVal := val.(db.Placement)
		return struct {
			tl   string
			rule db.PlacementRule
		}{pVal.TargetLabel, pVal.Rule}
	}

	_, addSet, removeSet := join.HashJoin(stitchPlacements,
		db.PlacementSlice(view.SelectFromPlacement(nil)), key, key)

	for _, toAddIntf := range addSet {
		toAdd := toAddIntf.(db.Placement)

		newPlacement := view.InsertPlacement()
		newPlacement.TargetLabel = toAdd.TargetLabel
		newPlacement.Rule = toAdd.Rule
		view.Commit(newPlacement)
	}

	for _, toRemove := range removeSet {
		view.Remove(toRemove.(db.Placement))
	}
}

func machineTxn(view db.Database, stitch stitch.Stitch) error {
	// XXX: How best to deal with machines that don't specify enough information?
	maxPrice, _ := stitch.QueryFloat("MaxPrice")
	stitchMachines := toDBMachine(stitch.QueryMachines(), maxPrice)

	dbMachines := view.SelectFromMachine(nil)

	scoreFun := func(left, right interface{}) int {
		stitchMachine := left.(db.Machine)
		dbMachine := right.(db.Machine)

		switch {
		case dbMachine.Provider != stitchMachine.Provider:
			return -1
		case dbMachine.Region != stitchMachine.Region:
			return -1
		case dbMachine.Size != "" && stitchMachine.Size != dbMachine.Size:
			return -1
		case dbMachine.Role != db.None && dbMachine.Role != stitchMachine.Role:
			return -1
		case dbMachine.DiskSize != stitchMachine.DiskSize:
			return -1
		case dbMachine.PrivateIP == "":
			return 2
		case dbMachine.PublicIP == "":
			return 1
		default:
			return 0
		}
	}

	pairs, bootList, terminateList := join.Join(stitchMachines, dbMachines, scoreFun)

	for _, toTerminate := range terminateList {
		toTerminate := toTerminate.(db.Machine)
		view.Remove(toTerminate)
	}

	for _, bootSet := range bootList {
		bootSet := bootSet.(db.Machine)

		pairs = append(pairs, join.Pair{L: bootSet, R: view.InsertMachine()})
	}

	for _, pair := range pairs {
		stitchMachine := pair.L.(db.Machine)
		dbMachine := pair.R.(db.Machine)

		dbMachine.Role = stitchMachine.Role
		dbMachine.Size = stitchMachine.Size
		dbMachine.DiskSize = stitchMachine.DiskSize
		dbMachine.Provider = stitchMachine.Provider
		dbMachine.Region = stitchMachine.Region
		dbMachine.SSHKeys = stitchMachine.SSHKeys
		view.Commit(dbMachine)
	}

	return nil
}

func updateDBLabels(view db.Database, etcdData storeData, ipMap map[string]string) {
	// Gather all of the label keys and IPs for single host labels, and IPs of
	// the containers in a given label.
	containerIPs := map[string][]string{}
	labelIPs := map[string]string{}
	labelKeys := map[string]struct{}{}
	for _, c := range etcdData.containers {
		for _, l := range c.Labels {
			labelKeys[l] = struct{}{}
			cIP := ipMap[strconv.Itoa(c.StitchID)]
			if _, ok := etcdData.multiHost[l]; !ok {
				labelIPs[l] = cIP
			}

			// The ordering of IPs between function calls will be consistent
			// because the containers are sorted by their StitchIDs when
			// inserted into etcd.
			containerIPs[l] = append(containerIPs[l], cIP)
		}
	}

	labelKeyFunc := func(val interface{}) interface{} {
		return val.(db.Label).Label
	}

	labelKeySlice := join.StringSlice{}
	for l := range labelKeys {
		labelKeySlice = append(labelKeySlice, l)
	}

	pairs, dbls, dirKeys := join.HashJoin(db.LabelSlice(view.SelectFromLabel(nil)),
		labelKeySlice, labelKeyFunc, nil)

	for _, dbl := range dbls {
		view.Remove(dbl.(db.Label))
	}

	for _, key := range dirKeys {
		pairs = append(pairs, join.Pair{L: view.InsertLabel(), R: key})
	}

	for _, pair := range pairs {
		dbl := pair.L.(db.Label)
		dbl.Label = pair.R.(string)
		if _, ok := etcdData.multiHost[dbl.Label]; ok {
			dbl.IP = etcdData.multiHost[dbl.Label]
			dbl.MultiHost = true
		} else {
			dbl.IP = labelIPs[dbl.Label]
			dbl.MultiHost = false
		}
		dbl.ContainerIPs = containerIPs[dbl.Label]

		view.Commit(dbl)
	}
}

func updateWorker(view db.Database, self db.Minion, store Store,
	etcdData storeData) {

	var containers []storeContainer
	for _, etcdc := range etcdData.containers {
		if etcdc.Minion == self.PrivateIP {
			containers = append(containers, etcdc)
		}
	}

	pairs, dbcs, etcdcs := join.Join(view.SelectFromContainer(nil), containers,
		func(left, right interface{}) int {
			dbc := left.(db.Container)
			l := storeContainer{
				StitchID: dbc.StitchID,
				Minion:   dbc.Minion,
				Image:    dbc.Image,
				Command:  dbc.Command,
				Env:      dbc.Env,
				Labels:   dbc.Labels,
			}
			return containerJoinScore(l, right.(storeContainer))
		})

	for _, i := range dbcs {
		dbc := i.(db.Container)
		view.Remove(dbc)
	}

	for _, etcdc := range etcdcs {
		pairs = append(pairs, join.Pair{
			L: view.InsertContainer(),
			R: etcdc,
		})
	}

	for _, pair := range pairs {
		dbc := pair.L.(db.Container)
		etcdc := pair.R.(storeContainer)

		dbc.StitchID = etcdc.StitchID
		dbc.Minion = etcdc.Minion
		dbc.Image = etcdc.Image
		dbc.Command = etcdc.Command
		dbc.Env = etcdc.Env
		dbc.Labels = etcdc.Labels

		view.Commit(dbc)
	}

	updateContainerIP(view.SelectFromContainer(nil), self.PrivateIP, store)
}

func updateContainers(view db.Database, spec stitch.Stitch) {
	score := func(l, r interface{}) int {
		left := l.(db.Container)
		right := r.(db.Container)

		if left.Image != right.Image ||
			!util.StrSliceEqual(left.Command, right.Command) ||
			!util.StrStrMapEqual(left.Env, right.Env) {
			return -1
		}

		score := util.EditDistance(left.Labels, right.Labels)
		if left.StitchID != right.StitchID {
			score++
		}
		return score
	}

	pairs, news, dbcs := join.Join(queryContainers(spec),
		view.SelectFromContainer(nil), score)

	for _, dbc := range dbcs {
		view.Remove(dbc.(db.Container))
	}

	for _, new := range news {
		pairs = append(pairs, join.Pair{L: new, R: view.InsertContainer()})
	}

	for _, pair := range pairs {
		newc := pair.L.(db.Container)
		dbc := pair.R.(db.Container)

		// By sorting the labels we prevent the database from getting confused
		// when their order is non deterministic.
		dbc.Labels = newc.Labels
		sort.Sort(sort.StringSlice(dbc.Labels))

		dbc.Command = newc.Command
		dbc.Image = newc.Image
		dbc.Env = newc.Env
		dbc.StitchID = newc.StitchID
		view.Commit(dbc)
	}
}

func (sv *supervisor) runAppTransact(view db.Database,
	dkcsArgs []docker.Container) []string {

	var tearDowns []string

	dbKey := func(val interface{}) interface{} {
		return val.(db.Container).DockerID
	}
	dkKey := func(val interface{}) interface{} {
		return val.(docker.Container).ID
	}

	pairs, dbcs, dkcs := join.HashJoin(db.ContainerSlice(
		view.SelectFromContainer(nil)),
		docker.ContainerSlice(dkcsArgs), dbKey, dkKey)

	for _, iface := range dbcs {
		dbc := iface.(db.Container)

		tearDowns = append(tearDowns, dbc.DockerID)
		view.Remove(dbc)
	}

	for _, dkc := range dkcs {
		pairs = append(pairs, join.Pair{L: view.InsertContainer(), R: dkc})
	}

	for _, pair := range pairs {
		dbc := pair.L.(db.Container)
		dkc := pair.R.(docker.Container)

		dbc.DockerID = dkc.ID
		dbc.Pid = dkc.Pid
		dbc.Image = dkc.Image
		dbc.Command = append([]string{dkc.Path}, dkc.Args...)
		view.Commit(dbc)
	}

	return tearDowns
}

func readLabelTransact(view db.Database, dir directory) {
	lKey := func(val interface{}) interface{} {
		return val.(db.Label).Label
	}
	pairs, dbls, dirKeys := join.HashJoin(db.LabelSlice(view.SelectFromLabel(nil)),
		join.StringSlice(dir.keys()), lKey, nil)

	for _, dbl := range dbls {
		view.Remove(dbl.(db.Label))
	}

	for _, key := range dirKeys {
		pairs = append(pairs, join.Pair{L: view.InsertLabel(), R: key})
	}

	for _, pair := range pairs {
		dbl := pair.L.(db.Label)
		dbl.Label = pair.R.(string)
		dbl.IP = dir[dbl.Label]["IP"]
		_, dbl.MultiHost = dir[dbl.Label]["MultiHost"]
		view.Commit(dbl)
	}
}