112 lines
3 KiB
Go
112 lines
3 KiB
Go
package router
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import (
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"fmt"
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"net"
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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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// FloodAddrFn gets the address to use for a given server when flood-joining. This
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// will return false if it doesn't have one.
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type FloodAddrFn func(*metadata.Server) (string, bool)
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// FloodPortFn gets the port to use for a given server when flood-joining. This
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// will return false if it doesn't have one.
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type FloodPortFn func(*metadata.Server) (int, bool)
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// FloodJoins attempts to make sure all Consul servers in the local Serf
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// instance are joined in the global Serf instance. It assumes names in the
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// local area are of the form <node> and those in the global 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, portFn FloodPortFn,
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localDatacenter string, localSerf *serf.Serf, globalSerf *serf.Serf) {
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// Names in the global Serf have the datacenter suffixed.
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suffix := fmt.Sprintf(".%s", localDatacenter)
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// Index the global side so we can do one pass through the local 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 globalSerf.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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localName := strings.TrimSuffix(server.Name, suffix)
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index[localName] = server
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}
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// Now run through the local side and look for joins.
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for _, m := range localSerf.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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// We can't use the port number from the local Serf, so we just
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// get the host part.
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addr, _, err := net.SplitHostPort(server.Addr.String())
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if err != nil {
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logger.Debug("Failed to flood-join server (bad address)",
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"server", server.Name,
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"address", server.Addr.String(),
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"error", err,
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)
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}
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if addrFn != nil {
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if a, ok := addrFn(server); ok {
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addr = a
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}
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}
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// Let the callback see if it can get the port number, otherwise
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// leave it blank to behave as if we just supplied an address.
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if port, ok := portFn(server); ok {
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addr = net.JoinHostPort(addr, fmt.Sprintf("%d", port))
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} else {
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// If we have an IPv6 address, we should add brackets,
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// single globalSerf.Join expects that.
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if ip := net.ParseIP(addr); ip != nil {
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if ip.To4() == nil {
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addr = fmt.Sprintf("[%s]", addr)
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}
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} else {
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logger.Debug("Failed to parse IP", "ip", addr)
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}
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}
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// Do the join!
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n, err := globalSerf.Join([]string{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", server.Name,
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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", server.Name,
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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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