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Implement multi-port endpoints

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Instead of endpoints being a flat list, it is now a list of "subsets"
where each is a struct of {Addresses, Ports}.  To generate the list of
endpoints you need to take union of the Cartesian products of the
subsets.  This is compact in the vast majority of cases, yet still
represents named ports and corner cases (e.g. each pod has a different
port number).

This also stores subsets in a deterministic order (sorted by hash) to
avoid spurious updates and comparison problems.

This is a fully compatible change - old objects and clients will
keepworking as long as they don't need the new functionality.

This is the prep for multi-port Services, which will add API to produce
endpoints in this new structure.
This commit is contained in:
Tim Hockin
2015-03-20 14:24:43 -07:00
parent 3eda80b3c5
commit 8ae203825b
43 changed files with 2090 additions and 1030 deletions
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43
pkg/registry/service/rest.go
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@@ -23,6 +23,7 @@ import (
"net/http"
"net/url"
"strconv"
"strings"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/api/errors"
@@ -233,19 +234,43 @@ var _ = rest.Redirector(&REST{})
// ResourceLocation returns a URL to which one can send traffic for the specified service.
func (rs *REST) ResourceLocation(ctx api.Context, id string) (*url.URL, http.RoundTripper, error) {
eps, err := rs.endpoints.GetEndpoints(ctx, id)
// Allow ID as "svcname" or "svcname:port".
parts := strings.Split(id, ":")
if len(parts) > 2 {
return nil, nil, errors.NewBadRequest(fmt.Sprintf("invalid service request %q", id))
}
svcName := parts[0]
portStr := ""
if len(parts) == 2 {
portStr = parts[1]
}
eps, err := rs.endpoints.GetEndpoints(ctx, svcName)
if err != nil {
return nil, nil, err
}
if len(eps.Endpoints) == 0 {
return nil, nil, fmt.Errorf("no endpoints available for %v", id)
if len(eps.Subsets) == 0 {
return nil, nil, fmt.Errorf("no endpoints available for %q", svcName)
}
// We leave off the scheme ('http://') because we have no idea what sort of server
// is listening at this endpoint.
ep := &eps.Endpoints[rand.Intn(len(eps.Endpoints))]
return &url.URL{
Host: net.JoinHostPort(ep.IP, strconv.Itoa(ep.Port)),
}, nil, nil
// Pick a random Subset to start searching from.
ssSeed := rand.Intn(len(eps.Subsets))
// Find a Subset that has the port.
for ssi := 0; ssi < len(eps.Subsets); ssi++ {
ss := &eps.Subsets[(ssSeed+ssi)%len(eps.Subsets)]
for i := range ss.Ports {
if ss.Ports[i].Name == portStr {
// Pick a random address.
ip := ss.Addresses[rand.Intn(len(ss.Addresses))].IP
port := ss.Ports[i].Port
// We leave off the scheme ('http://') because we have no idea what sort of server
// is listening at this endpoint.
return &url.URL{
Host: net.JoinHostPort(ip, strconv.Itoa(port)),
}, nil, nil
}
}
}
return nil, nil, fmt.Errorf("no endpoints available for %q", id)
}
func (rs *REST) getLoadbalancerName(ctx api.Context, service *api.Service) string {