1 // Copyright (c) 2019 Cisco and/or its affiliates.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at:
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
15 // Package statsclient is pure Go implementation of VPP stats API client.
29 "git.fd.io/govpp.git/adapter"
30 "github.com/fsnotify/fsnotify"
31 "github.com/ftrvxmtrx/fd"
32 logger "github.com/sirupsen/logrus"
36 // DefaultSocketName is default VPP stats socket file path.
37 DefaultSocketName = adapter.DefaultStatsSocket
39 // DefaultSocketRetryPeriod is the time period after the socket availability
41 DefaultSocketRetryPeriod = 50 * time.Millisecond
43 // DefaultSocketRetryTimeout is the maximum time for the stats socket
44 DefaultSocketRetryTimeout = 3 * time.Second
48 // Debug is global variable that determines debug mode
49 Debug = os.Getenv("DEBUG_GOVPP_STATS") != ""
51 // Log is global logger
55 // init initializes global logger, which logs debug level messages to stdout.
59 Log.Level = logger.DebugLevel
60 Log.Debug("govpp/statsclient: enabled debug mode")
64 func debugf(f string, a ...interface{}) {
70 // implements StatsAPI
71 var _ adapter.StatsAPI = (*StatsClient)(nil)
73 // StatsClient is the pure Go implementation for VPP stats API.
74 type StatsClient struct {
76 retryPeriod time.Duration
77 retryTimeout time.Duration
81 // defines the adapter connection state
84 // to quit socket monitor
90 // Option is a StatsClient option
91 type Option func(*StatsClient)
93 // SetSocketRetryPeriod is and optional parameter to define a custom
94 // retry period while waiting for the VPP socket
95 func SetSocketRetryPeriod(t time.Duration) Option {
96 return func(c *StatsClient) {
101 // SetSocketRetryTimeout is and optional parameter to define a custom
102 // timeout while waiting for the VPP socket
103 func SetSocketRetryTimeout(t time.Duration) Option {
104 return func(c *StatsClient) {
109 // NewStatsClient returns a new StatsClient using socket.
110 // If socket is empty string DefaultSocketName is used.
111 func NewStatsClient(socket string, options ...Option) *StatsClient {
113 socket = DefaultSocketName
118 for _, option := range options {
121 if s.retryPeriod == 0 {
122 s.retryPeriod = DefaultSocketRetryPeriod
124 if s.retryTimeout == 0 {
125 s.retryTimeout = DefaultSocketRetryTimeout
130 // Connect to validated VPP stats socket and start monitoring
131 // socket file changes
132 func (sc *StatsClient) Connect() (err error) {
133 if err := sc.waitForSocket(); err != nil {
136 sc.done = make(chan struct{})
137 if sc.statSegment, err = sc.connect(); err != nil {
144 // Disconnect from the socket, unmap shared memory and terminate
146 func (sc *StatsClient) Disconnect() error {
147 if sc.headerData == nil {
150 if err := syscall.Munmap(sc.headerData); err != nil {
151 Log.Debugf("unmapping shared memory failed: %v", err)
152 return fmt.Errorf("unmapping shared memory failed: %v", err)
156 Log.Debugf("successfully unmapped shared memory")
160 func (sc *StatsClient) ListStats(patterns ...string) ([]string, error) {
161 if !sc.isConnected() {
162 return nil, adapter.ErrStatsDisconnected
164 accessEpoch := sc.accessStart()
165 if accessEpoch == 0 {
166 return nil, adapter.ErrStatsAccessFailed
169 indexes, err := sc.listIndexes(patterns...)
174 dirVector := sc.GetDirectoryVector()
175 if dirVector == nil {
176 return nil, fmt.Errorf("failed to list stats: %v", err)
178 vecLen := *(*uint32)(vectorLen(dirVector))
181 for _, index := range indexes {
183 return nil, fmt.Errorf("stat entry index %d out of dir vector len (%d)", index, vecLen)
185 _, dirName, _ := sc.GetStatDirOnIndex(dirVector, index)
186 names = append(names, string(dirName))
189 if !sc.accessEnd(accessEpoch) {
190 return nil, adapter.ErrStatsDataBusy
196 func (sc *StatsClient) DumpStats(patterns ...string) (entries []adapter.StatEntry, err error) {
197 if !sc.isConnected() {
198 return nil, adapter.ErrStatsDisconnected
200 accessEpoch := sc.accessStart()
201 if accessEpoch == 0 {
202 return nil, adapter.ErrStatsAccessFailed
205 indexes, err := sc.listIndexes(patterns...)
210 dirVector := sc.GetDirectoryVector()
211 if dirVector == nil {
214 dirLen := *(*uint32)(vectorLen(dirVector))
216 debugf("dumping entries for %d indexes", len(indexes))
218 entries = make([]adapter.StatEntry, 0, len(indexes))
219 for _, index := range indexes {
221 return nil, fmt.Errorf("stat entry index %d out of dir vector length (%d)", index, dirLen)
223 dirPtr, dirName, dirType := sc.GetStatDirOnIndex(dirVector, index)
224 if len(dirName) == 0 {
227 entry := adapter.StatEntry{
228 Name: append([]byte(nil), dirName...),
229 Type: adapter.StatType(dirType),
230 Data: sc.CopyEntryData(dirPtr),
232 entries = append(entries, entry)
235 if !sc.accessEnd(accessEpoch) {
236 return nil, adapter.ErrStatsDataBusy
242 func (sc *StatsClient) PrepareDir(patterns ...string) (*adapter.StatDir, error) {
243 if !sc.isConnected() {
244 return nil, adapter.ErrStatsDisconnected
246 dir := new(adapter.StatDir)
248 accessEpoch := sc.accessStart()
249 if accessEpoch == 0 {
250 return nil, adapter.ErrStatsAccessFailed
253 indexes, err := sc.listIndexes(patterns...)
257 dir.Indexes = indexes
259 dirVector := sc.GetDirectoryVector()
260 if dirVector == nil {
263 dirLen := *(*uint32)(vectorLen(dirVector))
265 debugf("dumping entries for %d indexes", len(indexes))
267 entries := make([]adapter.StatEntry, 0, len(indexes))
268 for _, index := range indexes {
270 return nil, fmt.Errorf("stat entry index %d out of dir vector length (%d)", index, dirLen)
272 dirPtr, dirName, dirType := sc.GetStatDirOnIndex(dirVector, index)
273 if len(dirName) == 0 {
276 entry := adapter.StatEntry{
277 Name: append([]byte(nil), dirName...),
278 Type: adapter.StatType(dirType),
279 Data: sc.CopyEntryData(dirPtr),
281 entries = append(entries, entry)
283 dir.Entries = entries
285 if !sc.accessEnd(accessEpoch) {
286 return nil, adapter.ErrStatsDataBusy
288 dir.Epoch = accessEpoch
293 // UpdateDir refreshes directory data for all counters
294 func (sc *StatsClient) UpdateDir(dir *adapter.StatDir) (err error) {
295 if !sc.isConnected() {
296 return adapter.ErrStatsDisconnected
298 epoch, _ := sc.GetEpoch()
299 if dir.Epoch != epoch {
300 return adapter.ErrStatsDirStale
303 accessEpoch := sc.accessStart()
304 if accessEpoch == 0 {
305 return adapter.ErrStatsAccessFailed
308 dirVector := sc.GetDirectoryVector()
309 if dirVector == nil {
312 for i, index := range dir.Indexes {
313 statSegDir, dirName, dirType := sc.GetStatDirOnIndex(dirVector, index)
314 if len(dirName) == 0 {
317 entry := &dir.Entries[i]
318 if !bytes.Equal(dirName, entry.Name) {
321 if adapter.StatType(dirType) != entry.Type {
324 if entry.Data == nil {
327 if err := sc.UpdateEntryData(statSegDir, &entry.Data); err != nil {
328 return fmt.Errorf("updating stat data for entry %s failed: %v", dirName, err)
331 if !sc.accessEnd(accessEpoch) {
332 return adapter.ErrStatsDataBusy
338 // checks the socket existence and waits for it for the designated
339 // time if it is not available immediately
340 func (sc *StatsClient) waitForSocket() error {
341 if _, err := os.Stat(sc.socket); err != nil {
342 if os.IsNotExist(err) {
344 ticker := time.NewTicker(sc.retryPeriod)
345 timeout := time.After(sc.retryTimeout)
349 if _, err := os.Stat(sc.socket); err == nil {
353 return fmt.Errorf("stats socket file %s is not ready within timeout (after %.2f s) ",
354 sc.socket, time.Since(n).Seconds())
358 return fmt.Errorf("stats socket error: %v", err)
364 // connect to the socket and map it into the memory. According to the
365 // header version info, an appropriate segment handler is returned
366 func (sc *StatsClient) connect() (ss statSegment, err error) {
367 addr := net.UnixAddr{
371 Log.Debugf("connecting to: %v", addr)
373 conn, err := net.DialUnix(addr.Net, nil, &addr)
375 Log.Warnf("connecting to socket %s failed: %s", addr, err)
379 if err := conn.Close(); err != nil {
380 Log.Warnf("closing socket failed: %v", err)
383 Log.Debugf("connected to socket")
385 files, err := fd.Get(conn, 1, nil)
387 return nil, fmt.Errorf("getting file descriptor over socket failed: %v", err)
390 return nil, fmt.Errorf("no files received over socket")
395 if err := file.Close(); err != nil {
396 Log.Warnf("closing file failed: %v", err)
400 info, err := file.Stat()
406 sc.headerData, err = syscall.Mmap(int(file.Fd()), 0, int(size), syscall.PROT_READ, syscall.MAP_SHARED)
408 Log.Debugf("mapping shared memory failed: %v", err)
409 return nil, fmt.Errorf("mapping shared memory failed: %v", err)
411 Log.Debugf("successfully mmapped shared memory segment (size: %v) %v", size, len(sc.headerData))
413 version := getVersion(sc.headerData)
416 ss = newStatSegmentV1(sc.headerData, size)
418 ss = newStatSegmentV2(sc.headerData, size)
420 return nil, fmt.Errorf("stat segment version is not supported: %v (min: %v, max: %v)",
421 version, minVersion, maxVersion)
425 atomic.CompareAndSwapUint32(&sc.connected, 0, 1)
430 // reconnect disconnects from the socket, re-validates it and
432 func (sc *StatsClient) reconnect() (err error) {
433 if err = sc.disconnect(); err != nil {
434 return fmt.Errorf("error disconnecting socket: %v", err)
436 if err = sc.waitForSocket(); err != nil {
437 return fmt.Errorf("error while waiting on socket: %v", err)
439 if sc.statSegment, err = sc.connect(); err != nil {
440 return fmt.Errorf("error connecting socket: %v", err)
445 // disconnect unmaps socket data from the memory and resets the header
446 func (sc *StatsClient) disconnect() error {
447 if !atomic.CompareAndSwapUint32(&sc.connected, 1, 0) {
448 return fmt.Errorf("stats client is already disconnected")
450 if sc.headerData == nil {
453 if err := syscall.Munmap(sc.headerData); err != nil {
454 Log.Debugf("unmapping shared memory failed: %v", err)
455 return fmt.Errorf("unmapping shared memory failed: %v", err)
459 Log.Debugf("successfully unmapped shared memory")
463 func (sc *StatsClient) monitorSocket() {
464 watcher, err := fsnotify.NewWatcher()
466 Log.Errorf("error starting socket monitor: %v", err)
473 case event := <-watcher.Events:
474 if event.Op == fsnotify.Remove && event.Name == sc.socket {
475 if err := sc.reconnect(); err != nil {
476 Log.Errorf("error occurred during socket reconnect: %v", err)
479 case err := <-watcher.Errors:
480 Log.Errorf("socket monitor delivered error event: %v", err)
482 err := watcher.Close()
483 Log.Debugf("socket monitor closed (error: %v)", err)
489 if err := watcher.Add(filepath.Dir(sc.socket)); err != nil {
490 Log.Errorf("failed to add socket address to the watcher: %v", err)
494 // Starts monitoring 'inProgress' field. Returns stats segment
495 // access epoch when completed, or zero value if not finished
496 // within MaxWaitInProgress
497 func (sc *StatsClient) accessStart() (epoch int64) {
500 epoch, inProg := sc.GetEpoch()
502 if time.Since(t) > MaxWaitInProgress {
505 time.Sleep(CheckDelayInProgress)
506 epoch, inProg = sc.GetEpoch()
511 // AccessEnd returns true if stats data reading was finished, false
513 func (sc *StatsClient) accessEnd(accessEpoch int64) bool {
514 epoch, inProgress := sc.GetEpoch()
515 if accessEpoch != epoch || inProgress {
521 // listIndexes lists indexes for all stat entries that match any of the regex patterns.
522 func (sc *StatsClient) listIndexes(patterns ...string) (indexes []uint32, err error) {
523 if len(patterns) == 0 {
524 return sc.listIndexesFunc(nil)
526 var regexes = make([]*regexp.Regexp, len(patterns))
527 for i, pattern := range patterns {
528 r, err := regexp.Compile(pattern)
530 return nil, fmt.Errorf("compiling regexp failed: %v", err)
534 nameMatches := func(name []byte) bool {
535 for _, r := range regexes {
542 return sc.listIndexesFunc(nameMatches)
545 // listIndexesFunc lists stats indexes. The optional function
546 // argument filters returned values or returns all if empty
547 func (sc *StatsClient) listIndexesFunc(f func(name []byte) bool) (indexes []uint32, err error) {
549 // there is around ~3157 stats, so to avoid too many allocations
550 // we set capacity to 3200 when listing all stats
551 indexes = make([]uint32, 0, 3200)
554 dirVector := sc.GetDirectoryVector()
555 if dirVector == nil {
558 vecLen := *(*uint32)(vectorLen(dirVector))
560 for i := uint32(0); i < vecLen; i++ {
561 _, dirName, _ := sc.GetStatDirOnIndex(dirVector, i)
563 if len(dirName) == 0 || !f(dirName) {
567 indexes = append(indexes, i)
573 func (sc *StatsClient) isConnected() bool {
574 return atomic.LoadUint32(&sc.connected) == 1