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extender.go
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extender.go
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/*
Copyright 2015 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package scheduler
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"time"
"k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/client/restclient"
utilnet "k8s.io/kubernetes/pkg/util/net"
"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
schedulerapi "k8s.io/kubernetes/plugin/pkg/scheduler/api"
)
const (
DefaultExtenderTimeout = 5 * time.Second
)
// HTTPExtender implements the algorithm.SchedulerExtender interface.
type HTTPExtender struct {
extenderURL string
filterVerb string
prioritizeVerb string
weight int
apiVersion string
client *http.Client
}
func makeTransport(config *schedulerapi.ExtenderConfig) (http.RoundTripper, error) {
var cfg restclient.Config
if config.TLSConfig != nil {
cfg.TLSClientConfig = *config.TLSConfig
}
if config.EnableHttps {
hasCA := len(cfg.CAFile) > 0 || len(cfg.CAData) > 0
if !hasCA {
cfg.Insecure = true
}
}
tlsConfig, err := restclient.TLSConfigFor(&cfg)
if err != nil {
return nil, err
}
if tlsConfig != nil {
return utilnet.SetTransportDefaults(&http.Transport{
TLSClientConfig: tlsConfig,
}), nil
}
return utilnet.SetTransportDefaults(&http.Transport{}), nil
}
func NewHTTPExtender(config *schedulerapi.ExtenderConfig, apiVersion string) (algorithm.SchedulerExtender, error) {
if config.HTTPTimeout.Nanoseconds() == 0 {
config.HTTPTimeout = time.Duration(DefaultExtenderTimeout)
}
transport, err := makeTransport(config)
if err != nil {
return nil, err
}
client := &http.Client{
Transport: transport,
Timeout: config.HTTPTimeout,
}
return &HTTPExtender{
extenderURL: config.URLPrefix,
apiVersion: apiVersion,
filterVerb: config.FilterVerb,
prioritizeVerb: config.PrioritizeVerb,
weight: config.Weight,
client: client,
}, nil
}
// Filter based on extender implemented predicate functions. The filtered list is
// expected to be a subset of the supplied list. failedNodesMap optionally contains
// the list of failed nodes and failure reasons.
func (h *HTTPExtender) Filter(pod *api.Pod, nodes []*api.Node) ([]*api.Node, schedulerapi.FailedNodesMap, error) {
var result schedulerapi.ExtenderFilterResult
if h.filterVerb == "" {
return nodes, schedulerapi.FailedNodesMap{}, nil
}
nodeItems := make([]api.Node, 0, len(nodes))
for _, node := range nodes {
nodeItems = append(nodeItems, *node)
}
args := schedulerapi.ExtenderArgs{
Pod: *pod,
Nodes: api.NodeList{Items: nodeItems},
}
if err := h.send(h.filterVerb, &args, &result); err != nil {
return nil, nil, err
}
if result.Error != "" {
return nil, nil, fmt.Errorf(result.Error)
}
nodeResult := make([]*api.Node, 0, len(result.Nodes.Items))
for i := range result.Nodes.Items {
nodeResult = append(nodeResult, &result.Nodes.Items[i])
}
return nodeResult, result.FailedNodes, nil
}
// Prioritize based on extender implemented priority functions. Weight*priority is added
// up for each such priority function. The returned score is added to the score computed
// by Kubernetes scheduler. The total score is used to do the host selection.
func (h *HTTPExtender) Prioritize(pod *api.Pod, nodes []*api.Node) (*schedulerapi.HostPriorityList, int, error) {
var result schedulerapi.HostPriorityList
if h.prioritizeVerb == "" {
result := schedulerapi.HostPriorityList{}
for _, node := range nodes {
result = append(result, schedulerapi.HostPriority{Host: node.Name, Score: 0})
}
return &result, 0, nil
}
nodeItems := make([]api.Node, 0, len(nodes))
for _, node := range nodes {
nodeItems = append(nodeItems, *node)
}
args := schedulerapi.ExtenderArgs{
Pod: *pod,
Nodes: api.NodeList{Items: nodeItems},
}
if err := h.send(h.prioritizeVerb, &args, &result); err != nil {
return nil, 0, err
}
return &result, h.weight, nil
}
// Helper function to send messages to the extender
func (h *HTTPExtender) send(action string, args interface{}, result interface{}) error {
out, err := json.Marshal(args)
if err != nil {
return err
}
url := h.extenderURL + "/" + h.apiVersion + "/" + action
req, err := http.NewRequest("POST", url, bytes.NewReader(out))
if err != nil {
return err
}
req.Header.Set("Content-Type", "application/json")
resp, err := h.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
if err := json.Unmarshal(body, result); err != nil {
return err
}
return nil
}