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package driver
import (
"fmt"
"os"
"path/filepath"
"strconv"
"strings"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/util"
)
// Implements Mounter
type seaweedFsMounter struct {
volumeID string
path string
collection string
readOnly bool
driver *SeaweedFsDriver
volContext map[string]string
}
type seaweedFsUnmounter struct {
unmounter Unmounter
cacheDir string
}
const (
seaweedFsCmd = "weed"
)
func newSeaweedFsMounter(volumeID string, path string, collection string, readOnly bool, driver *SeaweedFsDriver, volContext map[string]string) (Mounter, error) {
return &seaweedFsMounter{
volumeID: volumeID,
path: path,
collection: collection,
readOnly: readOnly,
driver: driver,
volContext: volContext,
}, nil
}
func (seaweedFs *seaweedFsMounter) Mount(target string) (Unmounter, error) {
glog.V(0).Infof("mounting %v %s to %s", seaweedFs.driver.filers, seaweedFs.path, target)
var filers []string
for _, address := range seaweedFs.driver.filers {
filers = append(filers, string(address))
}
// CacheDir should be always defined - we use temp dir in case it is not defined
// we need to use predictable cache path, because we need to clean it up on unstage
cacheDir := filepath.Join(seaweedFs.driver.CacheDir, seaweedFs.volumeID)
// Final args
args := []string{
"-logtostderr=true",
"mount",
"-dirAutoCreate=true",
"-umask=000",
fmt.Sprintf("-dir=%s", target),
fmt.Sprintf("-localSocket=%s", GetLocalSocket(seaweedFs.volumeID)),
fmt.Sprintf("-cacheDir=%s", cacheDir),
}
if seaweedFs.readOnly {
args = append(args, "-readOnly")
}
// Handle volumeCapacity from controllerserver.go:51
if value, ok := seaweedFs.volContext["volumeCapacity"]; ok{
capacityMB := parseVolumeCapacity(value)
args = append(args, fmt.Sprintf("-collectionQuotaMB=%d", capacityMB))
}
// Initial values for override-able args
argsMap := map[string]string {
"collection": seaweedFs.collection,
"filer": strings.Join(filers, ","),
"filer.path": seaweedFs.path,
"cacheCapacityMB": fmt.Sprint(seaweedFs.driver.CacheCapacityMB),
"concurrentWriters": fmt.Sprint(seaweedFs.driver.ConcurrentWriters),
"map.uid": seaweedFs.driver.UidMap,
"map.gid": seaweedFs.driver.GidMap,
}
// volContext-parameter -> mount-arg
parameterArgMap := map[string]string{
"uidMap": "map.uid",
"gidMap": "map.gid",
"filerPath": "filer.path",
// volumeContext has "diskType", but mount-option is "disk", converting for backwards compatability
"diskType": "disk",
}
// Merge volContext into argsMap with key-mapping
for arg, value := range seaweedFs.volContext {
if(arg == "volumeCapacity"){ // Ignore volumeCapacity, not the nicest solution like this :/
continue
}
// Check if key-mapping exists
newArg, ok := parameterArgMap[arg]
if(ok){
arg = newArg
}
// Write to args-map
argsMap[arg] = value
}
// Convert Args-Map to args
for arg, value := range argsMap{
if(value != ""){ // ignore empty values
args = append(args, fmt.Sprintf("-%s=%s", arg, value))
}
}
u, err := fuseMount(target, seaweedFsCmd, args)
if err != nil {
glog.Errorf("mount %v %s to %s: %s", seaweedFs.driver.filers, seaweedFs.path, target, err)
}
return &seaweedFsUnmounter{unmounter: u, cacheDir: cacheDir}, err
}
func (su *seaweedFsUnmounter) Unmount() error {
err := su.unmounter.Unmount()
_ = os.RemoveAll(su.cacheDir)
return err
}
func GetLocalSocket(volumeID string) string {
montDirHash := util.HashToInt32([]byte(volumeID))
if montDirHash < 0 {
montDirHash = -montDirHash
}
socket := fmt.Sprintf("/tmp/seaweedfs-mount-%d.sock", montDirHash)
return socket
}
func parseVolumeCapacity(volumeCapacity string) int64 {
var capacity int64
if vCap, err := strconv.ParseInt(volumeCapacity, 10, 64); err != nil {
glog.Errorf("volumeCapacity %s can not be parsed to Int64, err is: %v", volumeCapacity, err)
} else {
capacity = vCap
}
capacityMB := capacity / 1024 / 1024
return capacityMB
}
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