sslobodr | d046be8 | 2019-01-16 10:02:22 -0500 | [diff] [blame] | 1 | // Copyright 2018 The Prometheus Authors |
| 2 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 3 | // you may not use this file except in compliance with the License. |
| 4 | // You may obtain a copy of the License at |
| 5 | // |
| 6 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | // |
| 8 | // Unless required by applicable law or agreed to in writing, software |
| 9 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | // See the License for the specific language governing permissions and |
| 12 | // limitations under the License. |
| 13 | |
| 14 | package procfs |
| 15 | |
| 16 | // While implementing parsing of /proc/[pid]/mountstats, this blog was used |
| 17 | // heavily as a reference: |
| 18 | // https://utcc.utoronto.ca/~cks/space/blog/linux/NFSMountstatsIndex |
| 19 | // |
| 20 | // Special thanks to Chris Siebenmann for all of his posts explaining the |
| 21 | // various statistics available for NFS. |
| 22 | |
| 23 | import ( |
| 24 | "bufio" |
| 25 | "fmt" |
| 26 | "io" |
| 27 | "strconv" |
| 28 | "strings" |
| 29 | "time" |
| 30 | ) |
| 31 | |
| 32 | // Constants shared between multiple functions. |
| 33 | const ( |
| 34 | deviceEntryLen = 8 |
| 35 | |
| 36 | fieldBytesLen = 8 |
| 37 | fieldEventsLen = 27 |
| 38 | |
| 39 | statVersion10 = "1.0" |
| 40 | statVersion11 = "1.1" |
| 41 | |
| 42 | fieldTransport10TCPLen = 10 |
| 43 | fieldTransport10UDPLen = 7 |
| 44 | |
| 45 | fieldTransport11TCPLen = 13 |
| 46 | fieldTransport11UDPLen = 10 |
| 47 | ) |
| 48 | |
| 49 | // A Mount is a device mount parsed from /proc/[pid]/mountstats. |
| 50 | type Mount struct { |
| 51 | // Name of the device. |
| 52 | Device string |
| 53 | // The mount point of the device. |
| 54 | Mount string |
| 55 | // The filesystem type used by the device. |
| 56 | Type string |
| 57 | // If available additional statistics related to this Mount. |
| 58 | // Use a type assertion to determine if additional statistics are available. |
| 59 | Stats MountStats |
| 60 | } |
| 61 | |
| 62 | // A MountStats is a type which contains detailed statistics for a specific |
| 63 | // type of Mount. |
| 64 | type MountStats interface { |
| 65 | mountStats() |
| 66 | } |
| 67 | |
| 68 | // A MountStatsNFS is a MountStats implementation for NFSv3 and v4 mounts. |
| 69 | type MountStatsNFS struct { |
| 70 | // The version of statistics provided. |
| 71 | StatVersion string |
| 72 | // The age of the NFS mount. |
| 73 | Age time.Duration |
| 74 | // Statistics related to byte counters for various operations. |
| 75 | Bytes NFSBytesStats |
| 76 | // Statistics related to various NFS event occurrences. |
| 77 | Events NFSEventsStats |
| 78 | // Statistics broken down by filesystem operation. |
| 79 | Operations []NFSOperationStats |
| 80 | // Statistics about the NFS RPC transport. |
| 81 | Transport NFSTransportStats |
| 82 | } |
| 83 | |
| 84 | // mountStats implements MountStats. |
| 85 | func (m MountStatsNFS) mountStats() {} |
| 86 | |
| 87 | // A NFSBytesStats contains statistics about the number of bytes read and written |
| 88 | // by an NFS client to and from an NFS server. |
| 89 | type NFSBytesStats struct { |
| 90 | // Number of bytes read using the read() syscall. |
| 91 | Read uint64 |
| 92 | // Number of bytes written using the write() syscall. |
| 93 | Write uint64 |
| 94 | // Number of bytes read using the read() syscall in O_DIRECT mode. |
| 95 | DirectRead uint64 |
| 96 | // Number of bytes written using the write() syscall in O_DIRECT mode. |
| 97 | DirectWrite uint64 |
| 98 | // Number of bytes read from the NFS server, in total. |
| 99 | ReadTotal uint64 |
| 100 | // Number of bytes written to the NFS server, in total. |
| 101 | WriteTotal uint64 |
| 102 | // Number of pages read directly via mmap()'d files. |
| 103 | ReadPages uint64 |
| 104 | // Number of pages written directly via mmap()'d files. |
| 105 | WritePages uint64 |
| 106 | } |
| 107 | |
| 108 | // A NFSEventsStats contains statistics about NFS event occurrences. |
| 109 | type NFSEventsStats struct { |
| 110 | // Number of times cached inode attributes are re-validated from the server. |
| 111 | InodeRevalidate uint64 |
| 112 | // Number of times cached dentry nodes are re-validated from the server. |
| 113 | DnodeRevalidate uint64 |
| 114 | // Number of times an inode cache is cleared. |
| 115 | DataInvalidate uint64 |
| 116 | // Number of times cached inode attributes are invalidated. |
| 117 | AttributeInvalidate uint64 |
| 118 | // Number of times files or directories have been open()'d. |
| 119 | VFSOpen uint64 |
| 120 | // Number of times a directory lookup has occurred. |
| 121 | VFSLookup uint64 |
| 122 | // Number of times permissions have been checked. |
| 123 | VFSAccess uint64 |
| 124 | // Number of updates (and potential writes) to pages. |
| 125 | VFSUpdatePage uint64 |
| 126 | // Number of pages read directly via mmap()'d files. |
| 127 | VFSReadPage uint64 |
| 128 | // Number of times a group of pages have been read. |
| 129 | VFSReadPages uint64 |
| 130 | // Number of pages written directly via mmap()'d files. |
| 131 | VFSWritePage uint64 |
| 132 | // Number of times a group of pages have been written. |
| 133 | VFSWritePages uint64 |
| 134 | // Number of times directory entries have been read with getdents(). |
| 135 | VFSGetdents uint64 |
| 136 | // Number of times attributes have been set on inodes. |
| 137 | VFSSetattr uint64 |
| 138 | // Number of pending writes that have been forcefully flushed to the server. |
| 139 | VFSFlush uint64 |
| 140 | // Number of times fsync() has been called on directories and files. |
| 141 | VFSFsync uint64 |
| 142 | // Number of times locking has been attempted on a file. |
| 143 | VFSLock uint64 |
| 144 | // Number of times files have been closed and released. |
| 145 | VFSFileRelease uint64 |
| 146 | // Unknown. Possibly unused. |
| 147 | CongestionWait uint64 |
| 148 | // Number of times files have been truncated. |
| 149 | Truncation uint64 |
| 150 | // Number of times a file has been grown due to writes beyond its existing end. |
| 151 | WriteExtension uint64 |
| 152 | // Number of times a file was removed while still open by another process. |
| 153 | SillyRename uint64 |
| 154 | // Number of times the NFS server gave less data than expected while reading. |
| 155 | ShortRead uint64 |
| 156 | // Number of times the NFS server wrote less data than expected while writing. |
| 157 | ShortWrite uint64 |
| 158 | // Number of times the NFS server indicated EJUKEBOX; retrieving data from |
| 159 | // offline storage. |
| 160 | JukeboxDelay uint64 |
| 161 | // Number of NFS v4.1+ pNFS reads. |
| 162 | PNFSRead uint64 |
| 163 | // Number of NFS v4.1+ pNFS writes. |
| 164 | PNFSWrite uint64 |
| 165 | } |
| 166 | |
| 167 | // A NFSOperationStats contains statistics for a single operation. |
| 168 | type NFSOperationStats struct { |
| 169 | // The name of the operation. |
| 170 | Operation string |
| 171 | // Number of requests performed for this operation. |
| 172 | Requests uint64 |
| 173 | // Number of times an actual RPC request has been transmitted for this operation. |
| 174 | Transmissions uint64 |
| 175 | // Number of times a request has had a major timeout. |
| 176 | MajorTimeouts uint64 |
| 177 | // Number of bytes sent for this operation, including RPC headers and payload. |
| 178 | BytesSent uint64 |
| 179 | // Number of bytes received for this operation, including RPC headers and payload. |
| 180 | BytesReceived uint64 |
| 181 | // Duration all requests spent queued for transmission before they were sent. |
| 182 | CumulativeQueueTime time.Duration |
| 183 | // Duration it took to get a reply back after the request was transmitted. |
| 184 | CumulativeTotalResponseTime time.Duration |
| 185 | // Duration from when a request was enqueued to when it was completely handled. |
| 186 | CumulativeTotalRequestTime time.Duration |
| 187 | } |
| 188 | |
| 189 | // A NFSTransportStats contains statistics for the NFS mount RPC requests and |
| 190 | // responses. |
| 191 | type NFSTransportStats struct { |
| 192 | // The transport protocol used for the NFS mount. |
| 193 | Protocol string |
| 194 | // The local port used for the NFS mount. |
| 195 | Port uint64 |
| 196 | // Number of times the client has had to establish a connection from scratch |
| 197 | // to the NFS server. |
| 198 | Bind uint64 |
| 199 | // Number of times the client has made a TCP connection to the NFS server. |
| 200 | Connect uint64 |
| 201 | // Duration (in jiffies, a kernel internal unit of time) the NFS mount has |
| 202 | // spent waiting for connections to the server to be established. |
| 203 | ConnectIdleTime uint64 |
| 204 | // Duration since the NFS mount last saw any RPC traffic. |
| 205 | IdleTime time.Duration |
| 206 | // Number of RPC requests for this mount sent to the NFS server. |
| 207 | Sends uint64 |
| 208 | // Number of RPC responses for this mount received from the NFS server. |
| 209 | Receives uint64 |
| 210 | // Number of times the NFS server sent a response with a transaction ID |
| 211 | // unknown to this client. |
| 212 | BadTransactionIDs uint64 |
| 213 | // A running counter, incremented on each request as the current difference |
| 214 | // ebetween sends and receives. |
| 215 | CumulativeActiveRequests uint64 |
| 216 | // A running counter, incremented on each request by the current backlog |
| 217 | // queue size. |
| 218 | CumulativeBacklog uint64 |
| 219 | |
| 220 | // Stats below only available with stat version 1.1. |
| 221 | |
| 222 | // Maximum number of simultaneously active RPC requests ever used. |
| 223 | MaximumRPCSlotsUsed uint64 |
| 224 | // A running counter, incremented on each request as the current size of the |
| 225 | // sending queue. |
| 226 | CumulativeSendingQueue uint64 |
| 227 | // A running counter, incremented on each request as the current size of the |
| 228 | // pending queue. |
| 229 | CumulativePendingQueue uint64 |
| 230 | } |
| 231 | |
| 232 | // parseMountStats parses a /proc/[pid]/mountstats file and returns a slice |
| 233 | // of Mount structures containing detailed information about each mount. |
| 234 | // If available, statistics for each mount are parsed as well. |
| 235 | func parseMountStats(r io.Reader) ([]*Mount, error) { |
| 236 | const ( |
| 237 | device = "device" |
| 238 | statVersionPrefix = "statvers=" |
| 239 | |
| 240 | nfs3Type = "nfs" |
| 241 | nfs4Type = "nfs4" |
| 242 | ) |
| 243 | |
| 244 | var mounts []*Mount |
| 245 | |
| 246 | s := bufio.NewScanner(r) |
| 247 | for s.Scan() { |
| 248 | // Only look for device entries in this function |
| 249 | ss := strings.Fields(string(s.Bytes())) |
| 250 | if len(ss) == 0 || ss[0] != device { |
| 251 | continue |
| 252 | } |
| 253 | |
| 254 | m, err := parseMount(ss) |
| 255 | if err != nil { |
| 256 | return nil, err |
| 257 | } |
| 258 | |
| 259 | // Does this mount also possess statistics information? |
| 260 | if len(ss) > deviceEntryLen { |
| 261 | // Only NFSv3 and v4 are supported for parsing statistics |
| 262 | if m.Type != nfs3Type && m.Type != nfs4Type { |
| 263 | return nil, fmt.Errorf("cannot parse MountStats for fstype %q", m.Type) |
| 264 | } |
| 265 | |
| 266 | statVersion := strings.TrimPrefix(ss[8], statVersionPrefix) |
| 267 | |
| 268 | stats, err := parseMountStatsNFS(s, statVersion) |
| 269 | if err != nil { |
| 270 | return nil, err |
| 271 | } |
| 272 | |
| 273 | m.Stats = stats |
| 274 | } |
| 275 | |
| 276 | mounts = append(mounts, m) |
| 277 | } |
| 278 | |
| 279 | return mounts, s.Err() |
| 280 | } |
| 281 | |
| 282 | // parseMount parses an entry in /proc/[pid]/mountstats in the format: |
| 283 | // device [device] mounted on [mount] with fstype [type] |
| 284 | func parseMount(ss []string) (*Mount, error) { |
| 285 | if len(ss) < deviceEntryLen { |
| 286 | return nil, fmt.Errorf("invalid device entry: %v", ss) |
| 287 | } |
| 288 | |
| 289 | // Check for specific words appearing at specific indices to ensure |
| 290 | // the format is consistent with what we expect |
| 291 | format := []struct { |
| 292 | i int |
| 293 | s string |
| 294 | }{ |
| 295 | {i: 0, s: "device"}, |
| 296 | {i: 2, s: "mounted"}, |
| 297 | {i: 3, s: "on"}, |
| 298 | {i: 5, s: "with"}, |
| 299 | {i: 6, s: "fstype"}, |
| 300 | } |
| 301 | |
| 302 | for _, f := range format { |
| 303 | if ss[f.i] != f.s { |
| 304 | return nil, fmt.Errorf("invalid device entry: %v", ss) |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | return &Mount{ |
| 309 | Device: ss[1], |
| 310 | Mount: ss[4], |
| 311 | Type: ss[7], |
| 312 | }, nil |
| 313 | } |
| 314 | |
| 315 | // parseMountStatsNFS parses a MountStatsNFS by scanning additional information |
| 316 | // related to NFS statistics. |
| 317 | func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, error) { |
| 318 | // Field indicators for parsing specific types of data |
| 319 | const ( |
| 320 | fieldAge = "age:" |
| 321 | fieldBytes = "bytes:" |
| 322 | fieldEvents = "events:" |
| 323 | fieldPerOpStats = "per-op" |
| 324 | fieldTransport = "xprt:" |
| 325 | ) |
| 326 | |
| 327 | stats := &MountStatsNFS{ |
| 328 | StatVersion: statVersion, |
| 329 | } |
| 330 | |
| 331 | for s.Scan() { |
| 332 | ss := strings.Fields(string(s.Bytes())) |
| 333 | if len(ss) == 0 { |
| 334 | break |
| 335 | } |
| 336 | if len(ss) < 2 { |
| 337 | return nil, fmt.Errorf("not enough information for NFS stats: %v", ss) |
| 338 | } |
| 339 | |
| 340 | switch ss[0] { |
| 341 | case fieldAge: |
| 342 | // Age integer is in seconds |
| 343 | d, err := time.ParseDuration(ss[1] + "s") |
| 344 | if err != nil { |
| 345 | return nil, err |
| 346 | } |
| 347 | |
| 348 | stats.Age = d |
| 349 | case fieldBytes: |
| 350 | bstats, err := parseNFSBytesStats(ss[1:]) |
| 351 | if err != nil { |
| 352 | return nil, err |
| 353 | } |
| 354 | |
| 355 | stats.Bytes = *bstats |
| 356 | case fieldEvents: |
| 357 | estats, err := parseNFSEventsStats(ss[1:]) |
| 358 | if err != nil { |
| 359 | return nil, err |
| 360 | } |
| 361 | |
| 362 | stats.Events = *estats |
| 363 | case fieldTransport: |
| 364 | if len(ss) < 3 { |
| 365 | return nil, fmt.Errorf("not enough information for NFS transport stats: %v", ss) |
| 366 | } |
| 367 | |
| 368 | tstats, err := parseNFSTransportStats(ss[1:], statVersion) |
| 369 | if err != nil { |
| 370 | return nil, err |
| 371 | } |
| 372 | |
| 373 | stats.Transport = *tstats |
| 374 | } |
| 375 | |
| 376 | // When encountering "per-operation statistics", we must break this |
| 377 | // loop and parse them separately to ensure we can terminate parsing |
| 378 | // before reaching another device entry; hence why this 'if' statement |
| 379 | // is not just another switch case |
| 380 | if ss[0] == fieldPerOpStats { |
| 381 | break |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | if err := s.Err(); err != nil { |
| 386 | return nil, err |
| 387 | } |
| 388 | |
| 389 | // NFS per-operation stats appear last before the next device entry |
| 390 | perOpStats, err := parseNFSOperationStats(s) |
| 391 | if err != nil { |
| 392 | return nil, err |
| 393 | } |
| 394 | |
| 395 | stats.Operations = perOpStats |
| 396 | |
| 397 | return stats, nil |
| 398 | } |
| 399 | |
| 400 | // parseNFSBytesStats parses a NFSBytesStats line using an input set of |
| 401 | // integer fields. |
| 402 | func parseNFSBytesStats(ss []string) (*NFSBytesStats, error) { |
| 403 | if len(ss) != fieldBytesLen { |
| 404 | return nil, fmt.Errorf("invalid NFS bytes stats: %v", ss) |
| 405 | } |
| 406 | |
| 407 | ns := make([]uint64, 0, fieldBytesLen) |
| 408 | for _, s := range ss { |
| 409 | n, err := strconv.ParseUint(s, 10, 64) |
| 410 | if err != nil { |
| 411 | return nil, err |
| 412 | } |
| 413 | |
| 414 | ns = append(ns, n) |
| 415 | } |
| 416 | |
| 417 | return &NFSBytesStats{ |
| 418 | Read: ns[0], |
| 419 | Write: ns[1], |
| 420 | DirectRead: ns[2], |
| 421 | DirectWrite: ns[3], |
| 422 | ReadTotal: ns[4], |
| 423 | WriteTotal: ns[5], |
| 424 | ReadPages: ns[6], |
| 425 | WritePages: ns[7], |
| 426 | }, nil |
| 427 | } |
| 428 | |
| 429 | // parseNFSEventsStats parses a NFSEventsStats line using an input set of |
| 430 | // integer fields. |
| 431 | func parseNFSEventsStats(ss []string) (*NFSEventsStats, error) { |
| 432 | if len(ss) != fieldEventsLen { |
| 433 | return nil, fmt.Errorf("invalid NFS events stats: %v", ss) |
| 434 | } |
| 435 | |
| 436 | ns := make([]uint64, 0, fieldEventsLen) |
| 437 | for _, s := range ss { |
| 438 | n, err := strconv.ParseUint(s, 10, 64) |
| 439 | if err != nil { |
| 440 | return nil, err |
| 441 | } |
| 442 | |
| 443 | ns = append(ns, n) |
| 444 | } |
| 445 | |
| 446 | return &NFSEventsStats{ |
| 447 | InodeRevalidate: ns[0], |
| 448 | DnodeRevalidate: ns[1], |
| 449 | DataInvalidate: ns[2], |
| 450 | AttributeInvalidate: ns[3], |
| 451 | VFSOpen: ns[4], |
| 452 | VFSLookup: ns[5], |
| 453 | VFSAccess: ns[6], |
| 454 | VFSUpdatePage: ns[7], |
| 455 | VFSReadPage: ns[8], |
| 456 | VFSReadPages: ns[9], |
| 457 | VFSWritePage: ns[10], |
| 458 | VFSWritePages: ns[11], |
| 459 | VFSGetdents: ns[12], |
| 460 | VFSSetattr: ns[13], |
| 461 | VFSFlush: ns[14], |
| 462 | VFSFsync: ns[15], |
| 463 | VFSLock: ns[16], |
| 464 | VFSFileRelease: ns[17], |
| 465 | CongestionWait: ns[18], |
| 466 | Truncation: ns[19], |
| 467 | WriteExtension: ns[20], |
| 468 | SillyRename: ns[21], |
| 469 | ShortRead: ns[22], |
| 470 | ShortWrite: ns[23], |
| 471 | JukeboxDelay: ns[24], |
| 472 | PNFSRead: ns[25], |
| 473 | PNFSWrite: ns[26], |
| 474 | }, nil |
| 475 | } |
| 476 | |
| 477 | // parseNFSOperationStats parses a slice of NFSOperationStats by scanning |
| 478 | // additional information about per-operation statistics until an empty |
| 479 | // line is reached. |
| 480 | func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) { |
| 481 | const ( |
| 482 | // Number of expected fields in each per-operation statistics set |
| 483 | numFields = 9 |
| 484 | ) |
| 485 | |
| 486 | var ops []NFSOperationStats |
| 487 | |
| 488 | for s.Scan() { |
| 489 | ss := strings.Fields(string(s.Bytes())) |
| 490 | if len(ss) == 0 { |
| 491 | // Must break when reading a blank line after per-operation stats to |
| 492 | // enable top-level function to parse the next device entry |
| 493 | break |
| 494 | } |
| 495 | |
| 496 | if len(ss) != numFields { |
| 497 | return nil, fmt.Errorf("invalid NFS per-operations stats: %v", ss) |
| 498 | } |
| 499 | |
| 500 | // Skip string operation name for integers |
| 501 | ns := make([]uint64, 0, numFields-1) |
| 502 | for _, st := range ss[1:] { |
| 503 | n, err := strconv.ParseUint(st, 10, 64) |
| 504 | if err != nil { |
| 505 | return nil, err |
| 506 | } |
| 507 | |
| 508 | ns = append(ns, n) |
| 509 | } |
| 510 | |
| 511 | ops = append(ops, NFSOperationStats{ |
| 512 | Operation: strings.TrimSuffix(ss[0], ":"), |
| 513 | Requests: ns[0], |
| 514 | Transmissions: ns[1], |
| 515 | MajorTimeouts: ns[2], |
| 516 | BytesSent: ns[3], |
| 517 | BytesReceived: ns[4], |
| 518 | CumulativeQueueTime: time.Duration(ns[5]) * time.Millisecond, |
| 519 | CumulativeTotalResponseTime: time.Duration(ns[6]) * time.Millisecond, |
| 520 | CumulativeTotalRequestTime: time.Duration(ns[7]) * time.Millisecond, |
| 521 | }) |
| 522 | } |
| 523 | |
| 524 | return ops, s.Err() |
| 525 | } |
| 526 | |
| 527 | // parseNFSTransportStats parses a NFSTransportStats line using an input set of |
| 528 | // integer fields matched to a specific stats version. |
| 529 | func parseNFSTransportStats(ss []string, statVersion string) (*NFSTransportStats, error) { |
| 530 | // Extract the protocol field. It is the only string value in the line |
| 531 | protocol := ss[0] |
| 532 | ss = ss[1:] |
| 533 | |
| 534 | switch statVersion { |
| 535 | case statVersion10: |
| 536 | var expectedLength int |
| 537 | if protocol == "tcp" { |
| 538 | expectedLength = fieldTransport10TCPLen |
| 539 | } else if protocol == "udp" { |
| 540 | expectedLength = fieldTransport10UDPLen |
| 541 | } else { |
| 542 | return nil, fmt.Errorf("invalid NFS protocol \"%s\" in stats 1.0 statement: %v", protocol, ss) |
| 543 | } |
| 544 | if len(ss) != expectedLength { |
| 545 | return nil, fmt.Errorf("invalid NFS transport stats 1.0 statement: %v", ss) |
| 546 | } |
| 547 | case statVersion11: |
| 548 | var expectedLength int |
| 549 | if protocol == "tcp" { |
| 550 | expectedLength = fieldTransport11TCPLen |
| 551 | } else if protocol == "udp" { |
| 552 | expectedLength = fieldTransport11UDPLen |
| 553 | } else { |
| 554 | return nil, fmt.Errorf("invalid NFS protocol \"%s\" in stats 1.1 statement: %v", protocol, ss) |
| 555 | } |
| 556 | if len(ss) != expectedLength { |
| 557 | return nil, fmt.Errorf("invalid NFS transport stats 1.1 statement: %v", ss) |
| 558 | } |
| 559 | default: |
| 560 | return nil, fmt.Errorf("unrecognized NFS transport stats version: %q", statVersion) |
| 561 | } |
| 562 | |
| 563 | // Allocate enough for v1.1 stats since zero value for v1.1 stats will be okay |
| 564 | // in a v1.0 response. Since the stat length is bigger for TCP stats, we use |
| 565 | // the TCP length here. |
| 566 | // |
| 567 | // Note: slice length must be set to length of v1.1 stats to avoid a panic when |
| 568 | // only v1.0 stats are present. |
| 569 | // See: https://github.com/prometheus/node_exporter/issues/571. |
| 570 | ns := make([]uint64, fieldTransport11TCPLen) |
| 571 | for i, s := range ss { |
| 572 | n, err := strconv.ParseUint(s, 10, 64) |
| 573 | if err != nil { |
| 574 | return nil, err |
| 575 | } |
| 576 | |
| 577 | ns[i] = n |
| 578 | } |
| 579 | |
| 580 | // The fields differ depending on the transport protocol (TCP or UDP) |
| 581 | // From https://utcc.utoronto.ca/%7Ecks/space/blog/linux/NFSMountstatsXprt |
| 582 | // |
| 583 | // For the udp RPC transport there is no connection count, connect idle time, |
| 584 | // or idle time (fields #3, #4, and #5); all other fields are the same. So |
| 585 | // we set them to 0 here. |
| 586 | if protocol == "udp" { |
| 587 | ns = append(ns[:2], append(make([]uint64, 3), ns[2:]...)...) |
| 588 | } |
| 589 | |
| 590 | return &NFSTransportStats{ |
| 591 | Protocol: protocol, |
| 592 | Port: ns[0], |
| 593 | Bind: ns[1], |
| 594 | Connect: ns[2], |
| 595 | ConnectIdleTime: ns[3], |
| 596 | IdleTime: time.Duration(ns[4]) * time.Second, |
| 597 | Sends: ns[5], |
| 598 | Receives: ns[6], |
| 599 | BadTransactionIDs: ns[7], |
| 600 | CumulativeActiveRequests: ns[8], |
| 601 | CumulativeBacklog: ns[9], |
| 602 | MaximumRPCSlotsUsed: ns[10], |
| 603 | CumulativeSendingQueue: ns[11], |
| 604 | CumulativePendingQueue: ns[12], |
| 605 | }, nil |
| 606 | } |