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nodeinfoclient.go
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nodeinfoclient.go
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package swarm
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
log "github.com/sirupsen/logrus"
)
type nodeInfoClient interface {
// GetNodeInfo returns a list of peers to join from an
// external service discovery source.
GetNodeInfo() ([]*NodeInfo, error)
// Self returns NodeInfo about itself
Self() *NodeInfo
}
func NewNodeInfoClient(o Options) (nodeInfoClient, func()) {
log.Infof("swarm type: %s", o.swarm)
switch o.swarm {
case swarmKubernetes:
cli := NewNodeInfoClientKubernetes(o)
return cli, cli.client.Stop
case swarmStatic:
return o.StaticSwarm, func() {
log.Infof("%s left swarm", o.StaticSwarm.Self())
}
case swarmFake:
return NewNodeInfoClientFake(o), func() {
// reset fakePeers to cleanup swarm nodes for tests
fakePeers = make([]*NodeInfo, 0)
}
default:
log.Errorf("unknown swarm type: %s", o.swarm)
return nil, func() {}
}
}
var fakePeers []*NodeInfo = make([]*NodeInfo, 0)
type nodeInfoClientFake struct {
self *NodeInfo
peers map[string]*NodeInfo
}
func NewNodeInfoClientFake(o Options) *nodeInfoClientFake {
ni := NewFakeNodeInfo(o.FakeSwarmLocalNode, []byte{127, 0, 0, 1}, o.SwarmPort)
nic := &nodeInfoClientFake{
self: ni,
peers: map[string]*NodeInfo{
o.FakeSwarmLocalNode: ni,
},
}
for _, peer := range fakePeers {
nic.peers[peer.Name] = peer
}
fakePeers = append(fakePeers, ni)
return nic
}
func (nic *nodeInfoClientFake) GetNodeInfo() ([]*NodeInfo, error) {
allKnown := []*NodeInfo{}
for _, v := range nic.peers {
allKnown = append(allKnown, v)
}
return allKnown, nil
}
func (nic *nodeInfoClientFake) Self() *NodeInfo {
return nic.self
}
type nodeInfoClientKubernetes struct {
kubernetesInCluster bool
kubeAPIBaseURL string
client *ClientKubernetes
namespace string
labelKey string
labelVal string
port uint16
}
func NewNodeInfoClientKubernetes(o Options) *nodeInfoClientKubernetes {
log.Debug("SWARM: NewnodeInfoClient")
cli, err := NewClientKubernetes(o.KubernetesOptions.KubernetesInCluster, o.KubernetesOptions.KubernetesAPIBaseURL)
if err != nil {
log.Fatalf("SWARM: failed to create kubernetes client: %v", err)
}
return &nodeInfoClientKubernetes{
client: cli,
kubernetesInCluster: o.KubernetesOptions.KubernetesInCluster,
kubeAPIBaseURL: o.KubernetesOptions.KubernetesAPIBaseURL,
namespace: o.KubernetesOptions.Namespace,
labelKey: o.KubernetesOptions.LabelSelectorKey,
labelVal: o.KubernetesOptions.LabelSelectorValue,
port: o.SwarmPort,
}
}
func (c *nodeInfoClientKubernetes) Self() *NodeInfo {
nodes, err := c.GetNodeInfo()
if err != nil {
log.Errorf("Failed to get self: %v", err)
return nil
}
return getSelf(nodes)
}
// GetNodeInfo returns a list of peers to join from Kubernetes API
// server.
func (c *nodeInfoClientKubernetes) GetNodeInfo() ([]*NodeInfo, error) {
s, err := c.nodeInfoURL()
if err != nil {
log.Debugf("SWARM: failed to build request url for %s %s=%s: %s", c.namespace, c.labelKey, c.labelVal, err)
return nil, err
}
rsp, err := c.client.Get(s)
if err != nil {
log.Debugf("SWARM: request to %s %s=%s failed: %v", c.namespace, c.labelKey, c.labelVal, err)
return nil, err
}
defer rsp.Body.Close()
if rsp.StatusCode > http.StatusBadRequest {
log.Debugf("SWARM: request failed, status: %d, %s", rsp.StatusCode, rsp.Status)
return nil, fmt.Errorf("request failed, status: %d, %s", rsp.StatusCode, rsp.Status)
}
b := bytes.NewBuffer(nil)
if _, err := io.Copy(b, rsp.Body); err != nil {
log.Debugf("SWARM: reading response body failed: %v", err)
return nil, err
}
var il itemList
err = json.Unmarshal(b.Bytes(), &il)
if err != nil {
return nil, err
}
nodes := make([]*NodeInfo, 0)
for _, i := range il.Items {
addr := net.ParseIP(i.Status.PodIP)
if addr == nil {
log.Errorf("SWARM: failed to parse the ip %s", i.Status.PodIP)
continue
}
nodes = append(nodes, &NodeInfo{Name: i.Metadata.Name, Addr: addr, Port: c.port})
}
log.Debugf("SWARM: got nodeinfo %d", len(nodes))
return nodes, nil
}
type metadata struct {
Name string `json:"name"`
}
type status struct {
PodIP string `json:"podIP"`
}
type item struct {
Metadata metadata `json:"metadata"`
Status status `json:"status"`
}
type itemList struct {
Items []*item `json:"items"`
}
func (c *nodeInfoClientKubernetes) nodeInfoURL() (string, error) {
u, err := url.Parse(c.kubeAPIBaseURL)
if err != nil {
return "", err
}
u.Path = "/api/v1/namespaces/" + url.PathEscape(c.namespace) + "/pods"
a := make(url.Values)
a.Add(c.labelKey, c.labelVal)
ls := make(url.Values)
ls.Add("labelSelector", a.Encode())
u.RawQuery = ls.Encode()
return u.String(), nil
}