86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package router
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/consul/agent/metadata"
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"github.com/hashicorp/go-hclog"
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"github.com/hashicorp/serf/serf"
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)
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// FloodAddrPortFn gets the address and port to use for a given server when
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// flood-joining. This will return false if it doesn't have one.
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type FloodAddrFn func(*metadata.Server) (string, error)
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// FloodJoins attempts to make sure all Consul servers in the src Serf
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// instance are joined in the dst Serf instance. It assumes names in the
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// src area are of the form <node> and those in the dst area are of the
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// form <node>.<dc> as is done for WAN and general network areas in Consul
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// Enterprise.
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func FloodJoins(logger hclog.Logger, addrFn FloodAddrFn,
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localDatacenter string, srcSerf *serf.Serf, dstSerf *serf.Serf) {
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// Names in the dst Serf have the datacenter suffixed.
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suffix := fmt.Sprintf(".%s", localDatacenter)
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// Index the dst side so we can do one pass through the src side
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// with cheap lookups.
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index := make(map[string]*metadata.Server)
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for _, m := range dstSerf.Members() {
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ok, server := metadata.IsConsulServer(m)
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if !ok {
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continue
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}
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if server.Datacenter != localDatacenter {
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continue
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}
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srcName := strings.TrimSuffix(server.Name, suffix)
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index[srcName] = server
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}
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// Now run through the src side and look for joins.
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for _, m := range srcSerf.Members() {
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if m.Status != serf.StatusAlive {
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continue
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}
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ok, server := metadata.IsConsulServer(m)
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if !ok {
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continue
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}
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if _, ok := index[server.Name]; ok {
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continue
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}
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addr, err := addrFn(server)
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if err != nil {
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logger.Debug("Failed to flood-join server", "server",
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server.Name, "address", server.Addr.String(),
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"error", err,
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)
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continue
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}
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dstServerName := fmt.Sprintf("%s.%s", server.Name, server.Datacenter)
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// Do the join!
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n, err := dstSerf.Join([]string{dstServerName + "/" + addr}, true)
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if err != nil {
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logger.Debug("Failed to flood-join server at address",
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"server", dstServerName,
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"address", addr,
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"error", err,
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)
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} else if n > 0 {
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logger.Debug("Successfully performed flood-join for server at address",
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"server", dstServerName,
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"address", addr,
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)
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}
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}
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}
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