89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
|
|
// SPDX-License-Identifier: MPL-2.0
|
|
|
|
package router
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/hashicorp/consul/agent/metadata"
|
|
"github.com/hashicorp/go-hclog"
|
|
"github.com/hashicorp/serf/serf"
|
|
)
|
|
|
|
// FloodAddrFn gets the address and port to use for a given server when
|
|
// flood-joining. This will return false if it doesn't have one.
|
|
type FloodAddrFn func(*metadata.Server) (string, error)
|
|
|
|
// FloodJoins attempts to make sure all Consul servers in the src Serf
|
|
// instance are joined in the dst Serf instance. It assumes names in the
|
|
// src area are of the form <node> and those in the dst area are of the
|
|
// form <node>.<dc> as is done for WAN and general network areas in Consul
|
|
// Enterprise.
|
|
func FloodJoins(logger hclog.Logger, addrFn FloodAddrFn,
|
|
localDatacenter string, srcSerf *serf.Serf, dstSerf *serf.Serf) {
|
|
|
|
// Names in the dst Serf have the datacenter suffixed.
|
|
suffix := fmt.Sprintf(".%s", localDatacenter)
|
|
|
|
// Index the dst side so we can do one pass through the src side
|
|
// with cheap lookups.
|
|
index := make(map[string]*metadata.Server)
|
|
for _, m := range dstSerf.Members() {
|
|
ok, server := metadata.IsConsulServer(m)
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
if server.Datacenter != localDatacenter {
|
|
continue
|
|
}
|
|
|
|
srcName := strings.TrimSuffix(server.Name, suffix)
|
|
index[srcName] = server
|
|
}
|
|
|
|
// Now run through the src side and look for joins.
|
|
for _, m := range srcSerf.Members() {
|
|
if m.Status != serf.StatusAlive {
|
|
continue
|
|
}
|
|
|
|
ok, server := metadata.IsConsulServer(m)
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
if _, ok := index[server.Name]; ok {
|
|
continue
|
|
}
|
|
|
|
addr, err := addrFn(server)
|
|
if err != nil {
|
|
logger.Debug("Failed to flood-join server", "server",
|
|
server.Name, "address", server.Addr.String(),
|
|
"error", err,
|
|
)
|
|
continue
|
|
}
|
|
|
|
dstServerName := fmt.Sprintf("%s.%s", server.Name, server.Datacenter)
|
|
|
|
// Do the join!
|
|
n, err := dstSerf.Join([]string{dstServerName + "/" + addr}, true)
|
|
if err != nil {
|
|
logger.Debug("Failed to flood-join server at address",
|
|
"server", dstServerName,
|
|
"address", addr,
|
|
"error", err,
|
|
)
|
|
} else if n > 0 {
|
|
logger.Debug("Successfully performed flood-join for server at address",
|
|
"server", dstServerName,
|
|
"address", addr,
|
|
)
|
|
}
|
|
}
|
|
}
|