Implement basic CSI driver
Currently can create and remove volumes, but resizing and snapshots is not supported yet
This commit is contained in:
Vitaliy Filippov
@@ -0,0 +1,530 @@
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// Copyright (c) Vitaliy Filippov, 2019+
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// License: VNPL-1.1 or GNU GPL-2.0+ (see README.md for details)
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package vitastor
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import (
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"context"
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"encoding/json"
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"strings"
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"bytes"
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"strconv"
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"time"
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"fmt"
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"os"
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"os/exec"
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"io/ioutil"
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"github.com/kubernetes-csi/csi-lib-utils/protosanitizer"
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"k8s.io/klog"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"go.etcd.io/etcd/clientv3"
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"github.com/container-storage-interface/spec/lib/go/csi"
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)
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const (
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KB int64 = 1024
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MB int64 = 1024 * KB
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GB int64 = 1024 * MB
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TB int64 = 1024 * GB
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ETCD_TIMEOUT time.Duration = 15*time.Second
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)
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type InodeIndex struct
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{
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Id uint64 `json:"id"`
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PoolId uint64 `json:"pool_id"`
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}
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type InodeConfig struct
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{
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Name string `json:"name"`
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Size uint64 `json:"size,omitempty"`
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ParentPool uint64 `json:"parent_pool,omitempty"`
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ParentId uint64 `json:"parent_id,omitempty"`
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Readonly bool `json:"readonly,omitempty"`
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}
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type ControllerServer struct
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{
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*Driver
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}
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// NewControllerServer create new instance controller
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func NewControllerServer(driver *Driver) *ControllerServer
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{
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return &ControllerServer{
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Driver: driver,
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}
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}
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func GetConnectionParams(params map[string]string) (map[string]string, []string, string)
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{
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ctxVars := make(map[string]string)
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configPath := params["configPath"]
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if (configPath == "")
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{
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configPath = "/etc/vitastor/vitastor.conf"
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}
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else
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{
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ctxVars["configPath"] = configPath
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}
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config := make(map[string]interface{})
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if configFD, err := os.Open(configPath); err == nil
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{
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defer configFD.Close()
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data, _ := ioutil.ReadAll(configFD)
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json.Unmarshal(data, &config)
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}
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// Try to load prefix & etcd URL from the config
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var etcdUrl []string
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if (params["etcdUrl"] != "")
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{
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ctxVars["etcdUrl"] = params["etcdUrl"]
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etcdUrl = strings.Split(params["etcdUrl"], ",")
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}
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if (len(etcdUrl) == 0)
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{
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switch config["etcd_address"].(type)
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{
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case string:
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etcdUrl = strings.Split(config["etcd_address"].(string), ",")
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case []string:
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etcdUrl = config["etcd_address"].([]string)
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}
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}
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etcdPrefix := params["etcdPrefix"]
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if (etcdPrefix == "")
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{
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etcdPrefix, _ = config["etcd_prefix"].(string)
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if (etcdPrefix == "")
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{
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etcdPrefix = "/vitastor"
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}
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}
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else
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{
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ctxVars["etcdPrefix"] = etcdPrefix
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}
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return ctxVars, etcdUrl, etcdPrefix
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}
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// Create the volume
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func (cs *ControllerServer) CreateVolume(ctx context.Context, req *csi.CreateVolumeRequest) (*csi.CreateVolumeResponse, error)
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{
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klog.Infof("received controller create volume request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Errorf(codes.InvalidArgument, "request cannot be empty")
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}
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if (req.GetName() == "")
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{
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return nil, status.Error(codes.InvalidArgument, "name is a required field")
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}
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volumeCapabilities := req.GetVolumeCapabilities()
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if (volumeCapabilities == nil)
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{
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return nil, status.Error(codes.InvalidArgument, "volume capabilities is a required field")
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}
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etcdVolumePrefix := req.Parameters["etcdVolumePrefix"]
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poolId, _ := strconv.ParseUint(req.Parameters["poolId"], 10, 64)
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if (poolId == 0)
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{
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return nil, status.Error(codes.InvalidArgument, "poolId is missing in storage class configuration")
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}
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volName := etcdVolumePrefix + req.GetName()
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volSize := 1 * GB
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if capRange := req.GetCapacityRange(); capRange != nil
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{
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volSize = ((capRange.GetRequiredBytes() + MB - 1) / MB) * MB
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}
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// FIXME: The following should PROBABLY be implemented externally in a management tool
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ctxVars, etcdUrl, etcdPrefix := GetConnectionParams(req.Parameters)
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if (len(etcdUrl) == 0)
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{
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return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
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}
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// Connect to etcd
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cli, err := clientv3.New(clientv3.Config{
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DialTimeout: ETCD_TIMEOUT,
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Endpoints: etcdUrl,
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})
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to connect to etcd at "+strings.Join(etcdUrl, ",")+": "+err.Error())
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}
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defer cli.Close()
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var imageId uint64 = 0
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for
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{
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// Check if the image exists
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ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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resp, err := cli.Get(ctx, etcdPrefix+"/index/image/"+volName)
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
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}
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if (len(resp.Kvs) > 0)
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{
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kv := resp.Kvs[0]
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var v InodeIndex
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err := json.Unmarshal(kv.Value, &v)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "invalid /index/image/"+volName+" key in etcd: "+err.Error())
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}
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poolId = v.PoolId
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imageId = v.Id
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inodeCfgKey := fmt.Sprintf("/config/inode/%d/%d", poolId, imageId)
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ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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resp, err := cli.Get(ctx, etcdPrefix+inodeCfgKey)
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
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}
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if (len(resp.Kvs) == 0)
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{
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return nil, status.Error(codes.Internal, "missing "+inodeCfgKey+" key in etcd")
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}
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var inodeCfg InodeConfig
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err = json.Unmarshal(resp.Kvs[0].Value, &inodeCfg)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "invalid "+inodeCfgKey+" key in etcd: "+err.Error())
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}
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if (inodeCfg.Size < uint64(volSize))
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{
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return nil, status.Error(codes.Internal, "image "+volName+" is already created, but size is less than expected")
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}
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}
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else
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{
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// Find a free ID
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// Create image metadata in a transaction verifying that the image doesn't exist yet AND ID is still free
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maxIdKey := fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId)
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ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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resp, err := cli.Get(ctx, maxIdKey)
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
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}
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var modRev int64
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var nextId uint64
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if (len(resp.Kvs) > 0)
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{
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var err error
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nextId, err = strconv.ParseUint(string(resp.Kvs[0].Value), 10, 64)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, maxIdKey+" contains invalid ID")
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}
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modRev = resp.Kvs[0].ModRevision
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nextId++
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}
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else
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{
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nextId = 1
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}
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inodeIdxJson, _ := json.Marshal(InodeIndex{
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Id: nextId,
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PoolId: poolId,
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})
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inodeCfgJson, _ := json.Marshal(InodeConfig{
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Name: volName,
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Size: uint64(volSize),
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})
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ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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txnResp, err := cli.Txn(ctx).If(
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clientv3.Compare(clientv3.ModRevision(fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId)), "=", modRev),
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clientv3.Compare(clientv3.CreateRevision(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName)), "=", 0),
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clientv3.Compare(clientv3.CreateRevision(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, poolId, nextId)), "=", 0),
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).Then(
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clientv3.OpPut(fmt.Sprintf("%s/index/maxid/%d", etcdPrefix, poolId), fmt.Sprintf("%d", nextId)),
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clientv3.OpPut(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName), string(inodeIdxJson)),
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clientv3.OpPut(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, poolId, nextId), string(inodeCfgJson)),
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).Commit()
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to commit transaction in etcd: "+err.Error())
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}
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if (txnResp.Succeeded)
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{
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imageId = nextId
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break
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}
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// Start over if the transaction fails
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}
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}
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ctxVars["name"] = volName
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volumeIdJson, _ := json.Marshal(ctxVars)
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return &csi.CreateVolumeResponse{
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Volume: &csi.Volume{
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// Ugly, but VolumeContext isn't passed to DeleteVolume :-(
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VolumeId: string(volumeIdJson),
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CapacityBytes: volSize,
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},
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}, nil
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}
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// DeleteVolume deletes the given volume
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func (cs *ControllerServer) DeleteVolume(ctx context.Context, req *csi.DeleteVolumeRequest) (*csi.DeleteVolumeResponse, error)
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{
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klog.Infof("received controller delete volume request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Error(codes.InvalidArgument, "request cannot be empty")
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}
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ctxVars := make(map[string]string)
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err := json.Unmarshal([]byte(req.VolumeId), &ctxVars)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "volume ID not in JSON format")
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}
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volName := ctxVars["name"]
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_, etcdUrl, etcdPrefix := GetConnectionParams(ctxVars)
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if (len(etcdUrl) == 0)
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{
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return nil, status.Error(codes.InvalidArgument, "no etcdUrl in storage class configuration and no etcd_address in vitastor.conf")
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}
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cli, err := clientv3.New(clientv3.Config{
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DialTimeout: ETCD_TIMEOUT,
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Endpoints: etcdUrl,
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})
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to connect to etcd at "+strings.Join(etcdUrl, ",")+": "+err.Error())
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}
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defer cli.Close()
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// Find inode by name
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ctx, cancel := context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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resp, err := cli.Get(ctx, etcdPrefix+"/index/image/"+volName)
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
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}
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if (len(resp.Kvs) == 0)
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{
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return nil, status.Error(codes.NotFound, "volume "+volName+" does not exist")
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}
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var idx InodeIndex
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err = json.Unmarshal(resp.Kvs[0].Value, &idx)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "invalid /index/image/"+volName+" key in etcd: "+err.Error())
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}
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// Get inode config
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inodeCfgKey := fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, idx.PoolId, idx.Id)
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ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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resp, err = cli.Get(ctx, inodeCfgKey)
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to read key from etcd: "+err.Error())
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}
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if (len(resp.Kvs) == 0)
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{
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return nil, status.Error(codes.NotFound, "volume "+volName+" does not exist")
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}
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var inodeCfg InodeConfig
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err = json.Unmarshal(resp.Kvs[0].Value, &inodeCfg)
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "invalid "+inodeCfgKey+" key in etcd: "+err.Error())
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}
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// Delete inode data by invoking vitastor-rm
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args := []string{
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"--etcd_address", strings.Join(etcdUrl, ","),
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"--pool", fmt.Sprintf("%d", idx.PoolId),
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"--inode", fmt.Sprintf("%d", idx.Id),
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}
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if (ctxVars["configPath"] != "")
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{
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args = append(args, "--config_path", ctxVars["configPath"])
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}
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c := exec.Command("/usr/bin/vitastor-rm", args...)
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var stderr bytes.Buffer
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c.Stdout = nil
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c.Stderr = &stderr
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err = c.Run()
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stderrStr := string(stderr.Bytes())
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if (err != nil)
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{
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klog.Errorf("vitastor-rm failed: %s, status %s\n", stderrStr, err)
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return nil, status.Error(codes.Internal, stderrStr+" (status "+err.Error()+")")
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}
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// Delete inode config in etcd
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ctx, cancel = context.WithTimeout(context.Background(), ETCD_TIMEOUT)
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txnResp, err := cli.Txn(ctx).Then(
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clientv3.OpDelete(fmt.Sprintf("%s/index/image/%s", etcdPrefix, volName)),
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clientv3.OpDelete(fmt.Sprintf("%s/config/inode/%d/%d", etcdPrefix, idx.PoolId, idx.Id)),
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).Commit()
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cancel()
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if (err != nil)
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{
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return nil, status.Error(codes.Internal, "failed to delete keys in etcd: "+err.Error())
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}
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if (!txnResp.Succeeded)
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{
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return nil, status.Error(codes.Internal, "failed to delete keys in etcd: transaction failed")
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}
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return &csi.DeleteVolumeResponse{}, nil
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}
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// ControllerPublishVolume return Unimplemented error
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func (cs *ControllerServer) ControllerPublishVolume(ctx context.Context, req *csi.ControllerPublishVolumeRequest) (*csi.ControllerPublishVolumeResponse, error)
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{
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return nil, status.Error(codes.Unimplemented, "")
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}
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// ControllerUnpublishVolume return Unimplemented error
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func (cs *ControllerServer) ControllerUnpublishVolume(ctx context.Context, req *csi.ControllerUnpublishVolumeRequest) (*csi.ControllerUnpublishVolumeResponse, error)
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{
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return nil, status.Error(codes.Unimplemented, "")
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}
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// ValidateVolumeCapabilities checks whether the volume capabilities requested are supported.
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func (cs *ControllerServer) ValidateVolumeCapabilities(ctx context.Context, req *csi.ValidateVolumeCapabilitiesRequest) (*csi.ValidateVolumeCapabilitiesResponse, error)
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{
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klog.Infof("received controller validate volume capability request %+v", protosanitizer.StripSecrets(req))
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if (req == nil)
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{
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return nil, status.Errorf(codes.InvalidArgument, "request is nil")
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}
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volumeID := req.GetVolumeId()
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if (volumeID == "")
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{
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return nil, status.Error(codes.InvalidArgument, "volumeId is nil")
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}
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volumeCapabilities := req.GetVolumeCapabilities()
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if (volumeCapabilities == nil)
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{
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return nil, status.Error(codes.InvalidArgument, "volumeCapabilities is nil")
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}
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var volumeCapabilityAccessModes []*csi.VolumeCapability_AccessMode
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for _, mode := range []csi.VolumeCapability_AccessMode_Mode{
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csi.VolumeCapability_AccessMode_SINGLE_NODE_WRITER,
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csi.VolumeCapability_AccessMode_MULTI_NODE_MULTI_WRITER,
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} {
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volumeCapabilityAccessModes = append(volumeCapabilityAccessModes, &csi.VolumeCapability_AccessMode{Mode: mode})
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}
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capabilitySupport := false
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for _, capability := range volumeCapabilities
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{
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for _, volumeCapabilityAccessMode := range volumeCapabilityAccessModes
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{
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if (volumeCapabilityAccessMode.Mode == capability.AccessMode.Mode)
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{
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capabilitySupport = true
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}
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}
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}
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if (!capabilitySupport)
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{
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return nil, status.Errorf(codes.NotFound, "%v not supported", req.GetVolumeCapabilities())
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}
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return &csi.ValidateVolumeCapabilitiesResponse{
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Confirmed: &csi.ValidateVolumeCapabilitiesResponse_Confirmed{
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VolumeCapabilities: req.VolumeCapabilities,
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},
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}, nil
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||||
}
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// ListVolumes returns a list of volumes
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func (cs *ControllerServer) ListVolumes(ctx context.Context, req *csi.ListVolumesRequest) (*csi.ListVolumesResponse, error)
|
||||
{
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||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
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||||
// GetCapacity returns the capacity of the storage pool
|
||||
func (cs *ControllerServer) GetCapacity(ctx context.Context, req *csi.GetCapacityRequest) (*csi.GetCapacityResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
|
||||
// ControllerGetCapabilities returns the capabilities of the controller service.
|
||||
func (cs *ControllerServer) ControllerGetCapabilities(ctx context.Context, req *csi.ControllerGetCapabilitiesRequest) (*csi.ControllerGetCapabilitiesResponse, error)
|
||||
{
|
||||
functionControllerServerCapabilities := func(cap csi.ControllerServiceCapability_RPC_Type) *csi.ControllerServiceCapability
|
||||
{
|
||||
return &csi.ControllerServiceCapability{
|
||||
Type: &csi.ControllerServiceCapability_Rpc{
|
||||
Rpc: &csi.ControllerServiceCapability_RPC{
|
||||
Type: cap,
|
||||
},
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
var controllerServerCapabilities []*csi.ControllerServiceCapability
|
||||
for _, capability := range []csi.ControllerServiceCapability_RPC_Type{
|
||||
csi.ControllerServiceCapability_RPC_CREATE_DELETE_VOLUME,
|
||||
csi.ControllerServiceCapability_RPC_LIST_VOLUMES,
|
||||
csi.ControllerServiceCapability_RPC_EXPAND_VOLUME,
|
||||
csi.ControllerServiceCapability_RPC_CREATE_DELETE_SNAPSHOT,
|
||||
} {
|
||||
controllerServerCapabilities = append(controllerServerCapabilities, functionControllerServerCapabilities(capability))
|
||||
}
|
||||
|
||||
return &csi.ControllerGetCapabilitiesResponse{
|
||||
Capabilities: controllerServerCapabilities,
|
||||
}, nil
|
||||
}
|
||||
|
||||
// CreateSnapshot create snapshot of an existing PV
|
||||
func (cs *ControllerServer) CreateSnapshot(ctx context.Context, req *csi.CreateSnapshotRequest) (*csi.CreateSnapshotResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
|
||||
// DeleteSnapshot delete provided snapshot of a PV
|
||||
func (cs *ControllerServer) DeleteSnapshot(ctx context.Context, req *csi.DeleteSnapshotRequest) (*csi.DeleteSnapshotResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
|
||||
// ListSnapshots list the snapshots of a PV
|
||||
func (cs *ControllerServer) ListSnapshots(ctx context.Context, req *csi.ListSnapshotsRequest) (*csi.ListSnapshotsResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
|
||||
// ControllerExpandVolume resizes a volume
|
||||
func (cs *ControllerServer) ControllerExpandVolume(ctx context.Context, req *csi.ControllerExpandVolumeRequest) (*csi.ControllerExpandVolumeResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
|
||||
// ControllerGetVolume get volume info
|
||||
func (cs *ControllerServer) ControllerGetVolume(ctx context.Context, req *csi.ControllerGetVolumeRequest) (*csi.ControllerGetVolumeResponse, error)
|
||||
{
|
||||
return nil, status.Error(codes.Unimplemented, "")
|
||||
}
|
||||
Reference in New Issue
Block a user