/
driver.go
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/
driver.go
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/*
Copyright 2019 Hammerspace
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 driver
import (
"context"
"encoding/json"
"fmt"
"net"
"os"
"strconv"
"sync"
"time"
"github.com/hammer-space/csi-plugin/pkg/common"
log "github.com/sirupsen/logrus"
"github.com/container-storage-interface/spec/lib/go/csi"
client "github.com/hammer-space/csi-plugin/pkg/client"
"google.golang.org/grpc"
"google.golang.org/grpc/keepalive"
"google.golang.org/grpc/reflection"
)
type CSIDriver struct {
listener net.Listener
server *grpc.Server
wg sync.WaitGroup
running bool
lock sync.Mutex
volumeLocks map[string]*sync.Mutex //This only grows and may be a memory issue
snapshotLocks map[string]*sync.Mutex
hsclient *client.HammerspaceClient
NodeID string
}
func NewCSIDriver(endpoint, username, password, tlsVerifyStr string) *CSIDriver {
tlsVerify := false
if os.Getenv("HS_TLS_VERIFY") != "" {
tlsVerify, _ = strconv.ParseBool(tlsVerifyStr)
} else {
tlsVerify = false
}
client, err := client.NewHammerspaceClient(endpoint, username, password, tlsVerify)
if err != nil {
log.Error(err)
os.Exit(1)
}
// We now require mounting through a DSX server
common.UseAnvil = false
return &CSIDriver{
hsclient: client,
volumeLocks: make(map[string]*sync.Mutex),
snapshotLocks: make(map[string]*sync.Mutex),
NodeID: os.Getenv("CSI_NODE_NAME"),
}
}
func (c *CSIDriver) getVolumeLock(volName string) {
if _, exists := c.volumeLocks[volName]; !exists {
c.volumeLocks[volName] = &sync.Mutex{}
}
c.volumeLocks[volName].Lock()
}
func (c *CSIDriver) releaseVolumeLock(volName string) {
if _, exists := c.volumeLocks[volName]; exists {
if exists {
c.volumeLocks[volName].Unlock()
}
}
}
func (c *CSIDriver) getSnapshotLock(volName string) {
if _, exists := c.snapshotLocks[volName]; !exists {
c.snapshotLocks[volName] = &sync.Mutex{}
}
c.snapshotLocks[volName].Lock()
}
func (c *CSIDriver) releaseSnapshotLock(volName string) {
if _, exists := c.snapshotLocks[volName]; exists {
if exists {
c.snapshotLocks[volName].Unlock()
}
}
}
func (c *CSIDriver) goServe(started chan<- bool) {
c.wg.Add(1)
go func() {
defer c.wg.Done()
started <- true
err := c.server.Serve(c.listener)
if err != nil {
panic(err.Error())
}
}()
}
func (c *CSIDriver) Address() string {
return c.listener.Addr().String()
}
func (c *CSIDriver) Start(l net.Listener) error {
c.lock.Lock()
defer c.lock.Unlock()
// Set listener
c.listener = l
// Create a new grpc server
c.server = grpc.NewServer(
grpc.UnaryInterceptor(c.callInterceptor),
grpc.KeepaliveParams(keepalive.ServerParameters{
Time: 5 * time.Minute,
}),
)
csi.RegisterControllerServer(c.server, c)
csi.RegisterIdentityServer(c.server, c)
csi.RegisterNodeServer(c.server, c)
reflection.Register(c.server)
// Start listening for requests
waitForServer := make(chan bool)
c.goServe(waitForServer)
<-waitForServer
c.running = true
return nil
}
func (c *CSIDriver) Stop() {
c.lock.Lock()
defer c.lock.Unlock()
if !c.running {
return
}
c.server.Stop()
c.wg.Wait()
}
func (c *CSIDriver) Close() {
c.server.Stop()
}
func (c *CSIDriver) IsRunning() bool {
c.lock.Lock()
defer c.lock.Unlock()
return c.running
}
func (c *CSIDriver) GetHammerspaceClient() *client.HammerspaceClient {
return c.hsclient
}
func (c *CSIDriver) callInterceptor(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler) (interface{}, error) {
rsp, err := handler(ctx, req)
logGRPC(info.FullMethod, req, rsp, err)
return rsp, err
}
func logGRPC(method string, request, reply interface{}, err error) {
// Log JSON with the request and response for easier parsing
logMessage := struct {
Method string
Request interface{}
Response interface{}
Error string
}{
Method: method,
Request: request,
Response: reply,
}
if err != nil {
logMessage.Error = err.Error()
}
msg, _ := json.Marshal(logMessage)
fmt.Printf("gRPCCall: %s\n", msg)
}