107 lines
3.1 KiB
Go
107 lines
3.1 KiB
Go
package consul
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import (
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"fmt"
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"github.com/hashicorp/go-version"
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"github.com/hashicorp/serf/serf"
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"github.com/hashicorp/consul/agent/metadata"
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"github.com/hashicorp/consul/types"
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)
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// lanMergeDelegate is used to handle a cluster merge on the LAN gossip
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// ring. We check that the peers are in the same datacenter and abort the
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// merge if there is a mis-match.
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type lanMergeDelegate struct {
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dc string
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nodeID types.NodeID
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nodeName string
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segment string
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// TODO(partitions): use server and partition to reject gossip messages
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// from nodes in the wrong partition depending upon the role the node is
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// playing. For example servers will always be in the default partition,
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// but all clients in all partitions should be aware of the servers so that
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// general RPC routing works.
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server bool
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partition string
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}
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// uniqueIDMinVersion is the lowest version where we insist that nodes
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// have a unique ID.
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var uniqueIDMinVersion = version.Must(version.NewVersion("0.8.5"))
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func (md *lanMergeDelegate) NotifyMerge(members []*serf.Member) error {
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nodeMap := make(map[types.NodeID]string)
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for _, m := range members {
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if rawID, ok := m.Tags["id"]; ok && rawID != "" {
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if m.Status == serf.StatusLeft {
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continue
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}
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nodeID := types.NodeID(rawID)
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// See if there's another node that conflicts with us.
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if (nodeID == md.nodeID) && (m.Name != md.nodeName) {
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return fmt.Errorf("Member '%s' has conflicting node ID '%s' with this agent's ID",
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m.Name, nodeID)
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}
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// See if there are any two nodes that conflict with each
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// other. This lets us only do joins into a hygienic
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// cluster now that node IDs are critical for operation.
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if other, ok := nodeMap[nodeID]; ok {
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return fmt.Errorf("Member '%s' has conflicting node ID '%s' with member '%s'",
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m.Name, nodeID, other)
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}
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// Only map nodes with a version that's >= than when
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// we made host-based IDs opt-in, which helps prevent
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// chaos when upgrading older clusters. See #3070 for
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// more details.
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if ver, err := metadata.Build(m); err == nil {
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if ver.Compare(uniqueIDMinVersion) >= 0 {
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nodeMap[nodeID] = m.Name
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}
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}
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}
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if ok, dc := isConsulNode(*m); ok {
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if dc != md.dc {
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return fmt.Errorf("Member '%s' part of wrong datacenter '%s'",
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m.Name, dc)
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}
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}
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if ok, parts := metadata.IsConsulServer(*m); ok {
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if parts.Datacenter != md.dc {
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return fmt.Errorf("Member '%s' part of wrong datacenter '%s'",
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m.Name, parts.Datacenter)
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}
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}
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if segment := m.Tags["segment"]; segment != md.segment {
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return fmt.Errorf("Member '%s' part of wrong segment '%s' (expected '%s')",
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m.Name, segment, md.segment)
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}
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}
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return nil
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}
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// wanMergeDelegate is used to handle a cluster merge on the WAN gossip
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// ring. We check that the peers are server nodes and abort the merge
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// otherwise.
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type wanMergeDelegate struct {
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}
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func (md *wanMergeDelegate) NotifyMerge(members []*serf.Member) error {
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for _, m := range members {
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ok, _ := metadata.IsConsulServer(*m)
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if !ok {
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return fmt.Errorf("Member '%s' is not a server", m.Name)
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}
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}
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return nil
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}
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