// See the License for the specific language governing permissions and
// limitations under the License.
+// Package statsclient is pure Go implementation of VPP stats API client.
package statsclient
import (
"bytes"
"fmt"
- "net"
"os"
"regexp"
- "sync/atomic"
- "syscall"
- "time"
"unsafe"
- "github.com/ftrvxmtrx/fd"
logger "github.com/sirupsen/logrus"
"git.fd.io/govpp.git/adapter"
type StatsClient struct {
sockAddr string
- currentEpoch int64
- sharedHeader []byte
- directoryVector uintptr
- memorySize int
+ currentEpoch int64
+ statSegment
}
// NewStatsClient returns new VPP stats API client.
-func NewStatsClient(socketName string) *StatsClient {
- return &StatsClient{
- sockAddr: socketName,
- }
-}
-
-func (c *StatsClient) Connect() error {
- var sockName string
- if c.sockAddr == "" {
- sockName = adapter.DefaultStatsSocket
- } else {
- sockName = c.sockAddr
+func NewStatsClient(sockAddr string) *StatsClient {
+ if sockAddr == "" {
+ sockAddr = adapter.DefaultStatsSocket
}
-
- if _, err := os.Stat(sockName); err != nil {
- if os.IsNotExist(err) {
- return fmt.Errorf("stats socket file %q does not exists, ensure that VPP is running with `statseg { ... }` section in config", sockName)
- }
- return fmt.Errorf("stats socket file error: %v", err)
- }
-
- if err := c.statSegmentConnect(sockName); err != nil {
- return err
+ return &StatsClient{
+ sockAddr: sockAddr,
}
-
- return nil
}
-const statshmFilename = "statshm"
+const sockNotFoundWarn = `VPP stats socket not found at: %s!
+ Check if VPP is running with stats segment enabled.
+ To enable it include following section in VPP config:
+ statseg {
+ default
+ }
+`
-func (c *StatsClient) statSegmentConnect(sockName string) error {
- addr := &net.UnixAddr{
- Net: "unixpacket",
- Name: sockName,
+func (c *StatsClient) Connect() error {
+ // check if socket exists
+ if _, err := os.Stat(c.sockAddr); os.IsNotExist(err) {
+ Log.Warnf(sockNotFoundWarn, c.sockAddr)
+ return fmt.Errorf("stats socket file %s does not exist", c.sockAddr)
+ } else if err != nil {
+ return fmt.Errorf("stats socket error: %v", err)
}
- Log.Debugf("connecting to: %v", addr)
-
- conn, err := net.DialUnix(addr.Net, nil, addr)
- if err != nil {
- Log.Warnf("connecting to socket %s failed: %s", addr, err)
+ if err := c.statSegment.connect(c.sockAddr); err != nil {
return err
}
- defer func() {
- if err := conn.Close(); err != nil {
- Log.Warnf("closing socket failed: %v", err)
- }
- }()
-
- Log.Debugf("connected to socket: %v", addr)
-
- files, err := fd.Get(conn, 1, []string{statshmFilename})
- if err != nil {
- return fmt.Errorf("getting file descriptor over socket failed: %v", err)
- } else if len(files) == 0 {
- return fmt.Errorf("no files received over socket")
- }
- defer func() {
- for _, f := range files {
- if err := f.Close(); err != nil {
- Log.Warnf("closing file %s failed: %v", f.Name(), err)
- }
- }
- }()
-
- Log.Debugf("received %d files over socket", len(files))
- f := files[0]
+ ver := c.readVersion()
+ Log.Debugf("stat segment version: %v", ver)
- info, err := f.Stat()
- if err != nil {
+ if err := checkVersion(ver); err != nil {
return err
}
- size := int(info.Size())
-
- Log.Debugf("fd: name=%v size=%v", info.Name(), size)
-
- data, err := syscall.Mmap(int(f.Fd()), 0, size, syscall.PROT_READ, syscall.MAP_SHARED)
- if err != nil {
- Log.Warnf("mapping shared memory failed: %v", err)
- return fmt.Errorf("mapping shared memory failed: %v", err)
- }
-
- Log.Debugf("successfuly mapped shared memory")
-
- c.sharedHeader = data
- c.memorySize = size
-
return nil
}
func (c *StatsClient) Disconnect() error {
- err := syscall.Munmap(c.sharedHeader)
- if err != nil {
- Log.Warnf("unmapping shared memory failed: %v", err)
- return fmt.Errorf("unmapping shared memory failed: %v", err)
+ if err := c.statSegment.disconnect(); err != nil {
+ return err
}
- Log.Debugf("successfuly unmapped shared memory")
-
return nil
}
-func nameMatches(name string, patterns []string) bool {
- if len(patterns) == 0 {
- return true
- }
- for _, pattern := range patterns {
- matched, err := regexp.MatchString(pattern, name)
- if err == nil && matched {
- return true
- }
- }
- return false
-}
-
func (c *StatsClient) ListStats(patterns ...string) (statNames []string, err error) {
sa := c.accessStart()
if sa == nil {
nameVector := unsafe.Pointer(&c.sharedHeader[dirEntry.unionData]) // offset
vecLen := vectorLen(nameVector)
offsetVector := add(unsafe.Pointer(&c.sharedHeader[0]), uintptr(dirEntry.offsetVector))
+ fmt.Printf("vecLen: %v\n", vecLen)
data := make([]adapter.Name, vecLen)
for i := uint64(0); i < vecLen; i++ {
cb := *(*uint64)(add(offsetVector, uintptr(i)*unsafe.Sizeof(uint64(0))))
- nameVec := unsafe.Pointer(&c.sharedHeader[uintptr(cb)])
+ if cb == 0 {
+ Log.Debugf("\tname vector cb out of range")
+ continue
+ }
+ nameVec := unsafe.Pointer(&c.sharedHeader[cb])
+ fmt.Printf("offsetVector: %v, cb: %v\n", offsetVector, cb)
vecLen2 := vectorLen(nameVec)
var nameStr []byte
return statEntry
}
-type statDirectoryType int32
-
-func (t statDirectoryType) String() string {
- return adapter.StatType(t).String()
-}
-
-type statSegDirectoryEntry struct {
- directoryType statDirectoryType
- // unionData can represent: offset, index or value
- unionData uint64
- offsetVector uint64
- name [128]byte
-}
-
-type statSegSharedHeader struct {
- version uint64
- epoch int64
- inProgress int64
- directoryOffset int64
- errorOffset int64
- statsOffset int64
-}
-
-func (c *StatsClient) readVersion() uint64 {
- header := *(*statSegSharedHeader)(unsafe.Pointer(&c.sharedHeader[0]))
- version := atomic.LoadUint64(&header.version)
- return version
-}
-
-func (c *StatsClient) readEpoch() (int64, bool) {
- header := *(*statSegSharedHeader)(unsafe.Pointer(&c.sharedHeader[0]))
- epoch := atomic.LoadInt64(&header.epoch)
- inprog := atomic.LoadInt64(&header.inProgress)
- return epoch, inprog != 0
-}
-
-func (c *StatsClient) readOffsets() (dir, err, stat int64) {
- header := *(*statSegSharedHeader)(unsafe.Pointer(&c.sharedHeader[0]))
- dirOffset := atomic.LoadInt64(&header.directoryOffset)
- errOffset := atomic.LoadInt64(&header.errorOffset)
- statOffset := atomic.LoadInt64(&header.statsOffset)
- return dirOffset, errOffset, statOffset
-}
-
-type statSegAccess struct {
- epoch int64
-}
-
-var maxWaitInProgress = 1 * time.Second
-
-func (c *StatsClient) accessStart() *statSegAccess {
- epoch, inprog := c.readEpoch()
- t := time.Now()
- for inprog {
- if time.Since(t) > maxWaitInProgress {
- return nil
- }
- epoch, inprog = c.readEpoch()
- }
- return &statSegAccess{
- epoch: epoch,
+func nameMatches(name string, patterns []string) bool {
+ if len(patterns) == 0 {
+ return true
}
-}
-
-func (c *StatsClient) accessEnd(acc *statSegAccess) bool {
- epoch, inprog := c.readEpoch()
- if acc.epoch != epoch || inprog {
- return false
+ for _, pattern := range patterns {
+ matched, err := regexp.MatchString(pattern, name)
+ if err == nil && matched {
+ return true
+ }
}
- return true
-}
-
-type vecHeader struct {
- length uint64
- vectorData [0]uint8
-}
-
-func vectorLen(v unsafe.Pointer) uint64 {
- vec := *(*vecHeader)(unsafe.Pointer(uintptr(v) - unsafe.Sizeof(uintptr(0))))
- return vec.length
-}
-
-//go:nosplit
-func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
- return unsafe.Pointer(uintptr(p) + x)
+ return false
}
Code Review / govpp.git / blobdiff