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queryserver.go
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queryserver.go
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package agent
import (
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"path/filepath"
"strings"
"github.com/kubernetes-sigs/alibaba-cloud-csi-driver/pkg/options"
"github.com/kubernetes-sigs/alibaba-cloud-csi-driver/pkg/utils"
log "github.com/sirupsen/logrus"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
const (
// QueryServerSocket tag, used for queryserver socket
QueryServerSocket = "/var/run/node-extender-server/volume-query-server.sock"
)
// QueryRequest struct
// Identity: for volumeInfo Request
// PodName/PodNameSpace: PodRunTime Request
type QueryRequest struct {
Identity string `json:"identity"`
PodName string `json:"podName"`
PodNameSpace string `json:"podNameSpace"`
}
// QueryServer Kata Server
type QueryServer struct {
client kubernetes.Interface
}
// NewQueryServer new server
func NewQueryServer() *QueryServer {
cfg, err := clientcmd.BuildConfigFromFlags(options.MasterURL, options.Kubeconfig)
if err != nil {
log.Fatalf("Error building kubeconfig: %s", err.Error())
}
kubeClient, err := kubernetes.NewForConfig(cfg)
if err != nil {
log.Fatalf("Error building kubernetes clientset: %s", err.Error())
}
return &QueryServer{
client: kubeClient,
}
}
// RunQueryServer Routers
func (ks *QueryServer) RunQueryServer() {
socketAddr := &net.UnixAddr{Name: QueryServerSocket, Net: "unix"}
os.Remove(socketAddr.Name)
lis, err := net.ListenUnix("unix", socketAddr)
if err != nil {
log.Errorf("Listen Unix error: %s", err.Error())
return
}
// set router
log.Infof("Started Query Server with unix socket: %s", QueryServerSocket)
http.HandleFunc("/api/v1/volumeinfo", ks.volumeInfoHandler)
// http.HandleFunc("/api/v1/podruntime", ks.podRunTimeHander)
http.HandleFunc("/api/v1/ping", ks.pingHandler)
// Server Listen
svr := &http.Server{Handler: http.DefaultServeMux}
err = svr.Serve(lis)
if err != nil {
log.Errorf("Query Server Starting error: %s", err.Error())
}
log.Infof("Query Server Ending ....")
}
// volumeInfoHandler reply with volume options.
func (ks *QueryServer) volumeInfoHandler(w http.ResponseWriter, r *http.Request) {
reqInfo := QueryRequest{}
content, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Errorf("Request volumeInfo: Receive request read body error: %s", err.Error())
fmt.Fprintf(w, "null")
return
}
if err := json.Unmarshal(content, &reqInfo); err != nil {
log.Errorf("Request volumeInfo: Unmarshal request body(%s) error: %s", string(content), err.Error())
fmt.Fprintf(w, "null")
return
}
log.Infof("Request volumeInfo: Receive Request with identity: %s", reqInfo.Identity)
if reqInfo.Identity == "" {
fmt.Fprintf(w, "null")
return
}
// Response with file content
fileName := filepath.Join(reqInfo.Identity, utils.CsiPluginRunTimeFlagFile)
if utils.IsFileExisting(fileName) {
// Unmarshal file content to map
fileContent := utils.GetFileContent(fileName)
fileContent = strings.ToLower(fileContent)
volInfoMapFrom := map[string]string{}
if err := json.Unmarshal([]byte(fileContent), &volInfoMapFrom); err != nil {
log.Errorf("Request volumeInfo: Unmarshal fileContent (%s) error: %s", fileContent, err.Error())
fmt.Fprintf(w, "null")
return
}
volumeType := ""
if value, ok := volInfoMapFrom["volumetype"]; ok {
volumeType = value
}
// copy parts of items to new map
volInfoMapResponse := map[string]string{}
// for disk volume type
if volumeType == "block" {
if value, ok := volInfoMapFrom["device"]; ok {
volInfoMapResponse["path"] = value
}
if value, ok := volInfoMapFrom["identity"]; ok {
volInfoMapResponse["identity"] = value
}
volInfoMapResponse["volumeType"] = "block"
// for nas volume type
} else if volumeType == "nfs" {
if value, ok := volInfoMapFrom["server"]; ok {
volInfoMapResponse["server"] = value
}
if value, ok := volInfoMapFrom["path"]; ok {
volInfoMapResponse["path"] = value
}
if value, ok := volInfoMapFrom["vers"]; ok {
volInfoMapResponse["vers"] = value
} else {
volInfoMapResponse["vers"] = "3"
}
if value, ok := volInfoMapFrom["mode"]; ok {
volInfoMapResponse["mode"] = value
} else {
volInfoMapResponse["mode"] = ""
}
if value, ok := volInfoMapFrom["options"]; ok {
volInfoMapResponse["options"] = value
} else {
volInfoMapResponse["options"] = "noresvport,nolock,tcp"
}
volInfoMapResponse["volumeType"] = "nfs"
} else {
log.Errorf("Request volumeInfo: get error volumeType: %s for identity: %s", volumeType, reqInfo.Identity)
fmt.Fprintf(w, "null")
return
}
responseStr, err := json.Marshal(volInfoMapResponse)
if err != nil {
log.Errorf("Request volumeInfo: Marshal volInfoResp error: %s", err.Error())
fmt.Fprintf(w, "null")
return
}
// Send response
fmt.Fprintf(w, string(responseStr))
log.Infof("Request volumeInfo: Send Successful Response with: %s", responseStr)
return
}
// no found volume
log.Warnf("Request volumeInfo: Send Fail Response with: no found volume, %s", fileName)
fmt.Fprintf(w, "no found volume: %s", fileName)
return
}
// pingHandler ping test
func (ks *QueryServer) pingHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Ping successful")
}