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Diffstat (limited to 'vendor/github.com/prometheus/procfs/mountstats.go')
| -rw-r--r-- | vendor/github.com/prometheus/procfs/mountstats.go | 556 |
1 files changed, 0 insertions, 556 deletions
diff --git a/vendor/github.com/prometheus/procfs/mountstats.go b/vendor/github.com/prometheus/procfs/mountstats.go deleted file mode 100644 index 6b2b0ba9d..000000000 --- a/vendor/github.com/prometheus/procfs/mountstats.go +++ /dev/null @@ -1,556 +0,0 @@ -package procfs - -// While implementing parsing of /proc/[pid]/mountstats, this blog was used -// heavily as a reference: -// https://utcc.utoronto.ca/~cks/space/blog/linux/NFSMountstatsIndex -// -// Special thanks to Chris Siebenmann for all of his posts explaining the -// various statistics available for NFS. - -import ( - "bufio" - "fmt" - "io" - "strconv" - "strings" - "time" -) - -// Constants shared between multiple functions. -const ( - deviceEntryLen = 8 - - fieldBytesLen = 8 - fieldEventsLen = 27 - - statVersion10 = "1.0" - statVersion11 = "1.1" - - fieldTransport10Len = 10 - fieldTransport11Len = 13 -) - -// A Mount is a device mount parsed from /proc/[pid]/mountstats. -type Mount struct { - // Name of the device. - Device string - // The mount point of the device. - Mount string - // The filesystem type used by the device. - Type string - // If available additional statistics related to this Mount. - // Use a type assertion to determine if additional statistics are available. - Stats MountStats -} - -// A MountStats is a type which contains detailed statistics for a specific -// type of Mount. -type MountStats interface { - mountStats() -} - -// A MountStatsNFS is a MountStats implementation for NFSv3 and v4 mounts. -type MountStatsNFS struct { - // The version of statistics provided. - StatVersion string - // The age of the NFS mount. - Age time.Duration - // Statistics related to byte counters for various operations. - Bytes NFSBytesStats - // Statistics related to various NFS event occurrences. - Events NFSEventsStats - // Statistics broken down by filesystem operation. - Operations []NFSOperationStats - // Statistics about the NFS RPC transport. - Transport NFSTransportStats -} - -// mountStats implements MountStats. -func (m MountStatsNFS) mountStats() {} - -// A NFSBytesStats contains statistics about the number of bytes read and written -// by an NFS client to and from an NFS server. -type NFSBytesStats struct { - // Number of bytes read using the read() syscall. - Read uint64 - // Number of bytes written using the write() syscall. - Write uint64 - // Number of bytes read using the read() syscall in O_DIRECT mode. - DirectRead uint64 - // Number of bytes written using the write() syscall in O_DIRECT mode. - DirectWrite uint64 - // Number of bytes read from the NFS server, in total. - ReadTotal uint64 - // Number of bytes written to the NFS server, in total. - WriteTotal uint64 - // Number of pages read directly via mmap()'d files. - ReadPages uint64 - // Number of pages written directly via mmap()'d files. - WritePages uint64 -} - -// A NFSEventsStats contains statistics about NFS event occurrences. -type NFSEventsStats struct { - // Number of times cached inode attributes are re-validated from the server. - InodeRevalidate uint64 - // Number of times cached dentry nodes are re-validated from the server. - DnodeRevalidate uint64 - // Number of times an inode cache is cleared. - DataInvalidate uint64 - // Number of times cached inode attributes are invalidated. - AttributeInvalidate uint64 - // Number of times files or directories have been open()'d. - VFSOpen uint64 - // Number of times a directory lookup has occurred. - VFSLookup uint64 - // Number of times permissions have been checked. - VFSAccess uint64 - // Number of updates (and potential writes) to pages. - VFSUpdatePage uint64 - // Number of pages read directly via mmap()'d files. - VFSReadPage uint64 - // Number of times a group of pages have been read. - VFSReadPages uint64 - // Number of pages written directly via mmap()'d files. - VFSWritePage uint64 - // Number of times a group of pages have been written. - VFSWritePages uint64 - // Number of times directory entries have been read with getdents(). - VFSGetdents uint64 - // Number of times attributes have been set on inodes. - VFSSetattr uint64 - // Number of pending writes that have been forcefully flushed to the server. - VFSFlush uint64 - // Number of times fsync() has been called on directories and files. - VFSFsync uint64 - // Number of times locking has been attempted on a file. - VFSLock uint64 - // Number of times files have been closed and released. - VFSFileRelease uint64 - // Unknown. Possibly unused. - CongestionWait uint64 - // Number of times files have been truncated. - Truncation uint64 - // Number of times a file has been grown due to writes beyond its existing end. - WriteExtension uint64 - // Number of times a file was removed while still open by another process. - SillyRename uint64 - // Number of times the NFS server gave less data than expected while reading. - ShortRead uint64 - // Number of times the NFS server wrote less data than expected while writing. - ShortWrite uint64 - // Number of times the NFS server indicated EJUKEBOX; retrieving data from - // offline storage. - JukeboxDelay uint64 - // Number of NFS v4.1+ pNFS reads. - PNFSRead uint64 - // Number of NFS v4.1+ pNFS writes. - PNFSWrite uint64 -} - -// A NFSOperationStats contains statistics for a single operation. -type NFSOperationStats struct { - // The name of the operation. - Operation string - // Number of requests performed for this operation. - Requests uint64 - // Number of times an actual RPC request has been transmitted for this operation. - Transmissions uint64 - // Number of times a request has had a major timeout. - MajorTimeouts uint64 - // Number of bytes sent for this operation, including RPC headers and payload. - BytesSent uint64 - // Number of bytes received for this operation, including RPC headers and payload. - BytesReceived uint64 - // Duration all requests spent queued for transmission before they were sent. - CumulativeQueueTime time.Duration - // Duration it took to get a reply back after the request was transmitted. - CumulativeTotalResponseTime time.Duration - // Duration from when a request was enqueued to when it was completely handled. - CumulativeTotalRequestTime time.Duration -} - -// A NFSTransportStats contains statistics for the NFS mount RPC requests and -// responses. -type NFSTransportStats struct { - // The local port used for the NFS mount. - Port uint64 - // Number of times the client has had to establish a connection from scratch - // to the NFS server. - Bind uint64 - // Number of times the client has made a TCP connection to the NFS server. - Connect uint64 - // Duration (in jiffies, a kernel internal unit of time) the NFS mount has - // spent waiting for connections to the server to be established. - ConnectIdleTime uint64 - // Duration since the NFS mount last saw any RPC traffic. - IdleTime time.Duration - // Number of RPC requests for this mount sent to the NFS server. - Sends uint64 - // Number of RPC responses for this mount received from the NFS server. - Receives uint64 - // Number of times the NFS server sent a response with a transaction ID - // unknown to this client. - BadTransactionIDs uint64 - // A running counter, incremented on each request as the current difference - // ebetween sends and receives. - CumulativeActiveRequests uint64 - // A running counter, incremented on each request by the current backlog - // queue size. - CumulativeBacklog uint64 - - // Stats below only available with stat version 1.1. - - // Maximum number of simultaneously active RPC requests ever used. - MaximumRPCSlotsUsed uint64 - // A running counter, incremented on each request as the current size of the - // sending queue. - CumulativeSendingQueue uint64 - // A running counter, incremented on each request as the current size of the - // pending queue. - CumulativePendingQueue uint64 -} - -// parseMountStats parses a /proc/[pid]/mountstats file and returns a slice -// of Mount structures containing detailed information about each mount. -// If available, statistics for each mount are parsed as well. -func parseMountStats(r io.Reader) ([]*Mount, error) { - const ( - device = "device" - statVersionPrefix = "statvers=" - - nfs3Type = "nfs" - nfs4Type = "nfs4" - ) - - var mounts []*Mount - - s := bufio.NewScanner(r) - for s.Scan() { - // Only look for device entries in this function - ss := strings.Fields(string(s.Bytes())) - if len(ss) == 0 || ss[0] != device { - continue - } - - m, err := parseMount(ss) - if err != nil { - return nil, err - } - - // Does this mount also possess statistics information? - if len(ss) > deviceEntryLen { - // Only NFSv3 and v4 are supported for parsing statistics - if m.Type != nfs3Type && m.Type != nfs4Type { - return nil, fmt.Errorf("cannot parse MountStats for fstype %q", m.Type) - } - - statVersion := strings.TrimPrefix(ss[8], statVersionPrefix) - - stats, err := parseMountStatsNFS(s, statVersion) - if err != nil { - return nil, err - } - - m.Stats = stats - } - - mounts = append(mounts, m) - } - - return mounts, s.Err() -} - -// parseMount parses an entry in /proc/[pid]/mountstats in the format: -// device [device] mounted on [mount] with fstype [type] -func parseMount(ss []string) (*Mount, error) { - if len(ss) < deviceEntryLen { - return nil, fmt.Errorf("invalid device entry: %v", ss) - } - - // Check for specific words appearing at specific indices to ensure - // the format is consistent with what we expect - format := []struct { - i int - s string - }{ - {i: 0, s: "device"}, - {i: 2, s: "mounted"}, - {i: 3, s: "on"}, - {i: 5, s: "with"}, - {i: 6, s: "fstype"}, - } - - for _, f := range format { - if ss[f.i] != f.s { - return nil, fmt.Errorf("invalid device entry: %v", ss) - } - } - - return &Mount{ - Device: ss[1], - Mount: ss[4], - Type: ss[7], - }, nil -} - -// parseMountStatsNFS parses a MountStatsNFS by scanning additional information -// related to NFS statistics. -func parseMountStatsNFS(s *bufio.Scanner, statVersion string) (*MountStatsNFS, error) { - // Field indicators for parsing specific types of data - const ( - fieldAge = "age:" - fieldBytes = "bytes:" - fieldEvents = "events:" - fieldPerOpStats = "per-op" - fieldTransport = "xprt:" - ) - - stats := &MountStatsNFS{ - StatVersion: statVersion, - } - - for s.Scan() { - ss := strings.Fields(string(s.Bytes())) - if len(ss) == 0 { - break - } - if len(ss) < 2 { - return nil, fmt.Errorf("not enough information for NFS stats: %v", ss) - } - - switch ss[0] { - case fieldAge: - // Age integer is in seconds - d, err := time.ParseDuration(ss[1] + "s") - if err != nil { - return nil, err - } - - stats.Age = d - case fieldBytes: - bstats, err := parseNFSBytesStats(ss[1:]) - if err != nil { - return nil, err - } - - stats.Bytes = *bstats - case fieldEvents: - estats, err := parseNFSEventsStats(ss[1:]) - if err != nil { - return nil, err - } - - stats.Events = *estats - case fieldTransport: - if len(ss) < 3 { - return nil, fmt.Errorf("not enough information for NFS transport stats: %v", ss) - } - - tstats, err := parseNFSTransportStats(ss[2:], statVersion) - if err != nil { - return nil, err - } - - stats.Transport = *tstats - } - - // When encountering "per-operation statistics", we must break this - // loop and parse them separately to ensure we can terminate parsing - // before reaching another device entry; hence why this 'if' statement - // is not just another switch case - if ss[0] == fieldPerOpStats { - break - } - } - - if err := s.Err(); err != nil { - return nil, err - } - - // NFS per-operation stats appear last before the next device entry - perOpStats, err := parseNFSOperationStats(s) - if err != nil { - return nil, err - } - - stats.Operations = perOpStats - - return stats, nil -} - -// parseNFSBytesStats parses a NFSBytesStats line using an input set of -// integer fields. -func parseNFSBytesStats(ss []string) (*NFSBytesStats, error) { - if len(ss) != fieldBytesLen { - return nil, fmt.Errorf("invalid NFS bytes stats: %v", ss) - } - - ns := make([]uint64, 0, fieldBytesLen) - for _, s := range ss { - n, err := strconv.ParseUint(s, 10, 64) - if err != nil { - return nil, err - } - - ns = append(ns, n) - } - - return &NFSBytesStats{ - Read: ns[0], - Write: ns[1], - DirectRead: ns[2], - DirectWrite: ns[3], - ReadTotal: ns[4], - WriteTotal: ns[5], - ReadPages: ns[6], - WritePages: ns[7], - }, nil -} - -// parseNFSEventsStats parses a NFSEventsStats line using an input set of -// integer fields. -func parseNFSEventsStats(ss []string) (*NFSEventsStats, error) { - if len(ss) != fieldEventsLen { - return nil, fmt.Errorf("invalid NFS events stats: %v", ss) - } - - ns := make([]uint64, 0, fieldEventsLen) - for _, s := range ss { - n, err := strconv.ParseUint(s, 10, 64) - if err != nil { - return nil, err - } - - ns = append(ns, n) - } - - return &NFSEventsStats{ - InodeRevalidate: ns[0], - DnodeRevalidate: ns[1], - DataInvalidate: ns[2], - AttributeInvalidate: ns[3], - VFSOpen: ns[4], - VFSLookup: ns[5], - VFSAccess: ns[6], - VFSUpdatePage: ns[7], - VFSReadPage: ns[8], - VFSReadPages: ns[9], - VFSWritePage: ns[10], - VFSWritePages: ns[11], - VFSGetdents: ns[12], - VFSSetattr: ns[13], - VFSFlush: ns[14], - VFSFsync: ns[15], - VFSLock: ns[16], - VFSFileRelease: ns[17], - CongestionWait: ns[18], - Truncation: ns[19], - WriteExtension: ns[20], - SillyRename: ns[21], - ShortRead: ns[22], - ShortWrite: ns[23], - JukeboxDelay: ns[24], - PNFSRead: ns[25], - PNFSWrite: ns[26], - }, nil -} - -// parseNFSOperationStats parses a slice of NFSOperationStats by scanning -// additional information about per-operation statistics until an empty -// line is reached. -func parseNFSOperationStats(s *bufio.Scanner) ([]NFSOperationStats, error) { - const ( - // Number of expected fields in each per-operation statistics set - numFields = 9 - ) - - var ops []NFSOperationStats - - for s.Scan() { - ss := strings.Fields(string(s.Bytes())) - if len(ss) == 0 { - // Must break when reading a blank line after per-operation stats to - // enable top-level function to parse the next device entry - break - } - - if len(ss) != numFields { - return nil, fmt.Errorf("invalid NFS per-operations stats: %v", ss) - } - - // Skip string operation name for integers - ns := make([]uint64, 0, numFields-1) - for _, st := range ss[1:] { - n, err := strconv.ParseUint(st, 10, 64) - if err != nil { - return nil, err - } - - ns = append(ns, n) - } - - ops = append(ops, NFSOperationStats{ - Operation: strings.TrimSuffix(ss[0], ":"), - Requests: ns[0], - Transmissions: ns[1], - MajorTimeouts: ns[2], - BytesSent: ns[3], - BytesReceived: ns[4], - CumulativeQueueTime: time.Duration(ns[5]) * time.Millisecond, - CumulativeTotalResponseTime: time.Duration(ns[6]) * time.Millisecond, - CumulativeTotalRequestTime: time.Duration(ns[7]) * time.Millisecond, - }) - } - - return ops, s.Err() -} - -// parseNFSTransportStats parses a NFSTransportStats line using an input set of -// integer fields matched to a specific stats version. -func parseNFSTransportStats(ss []string, statVersion string) (*NFSTransportStats, error) { - switch statVersion { - case statVersion10: - if len(ss) != fieldTransport10Len { - return nil, fmt.Errorf("invalid NFS transport stats 1.0 statement: %v", ss) - } - case statVersion11: - if len(ss) != fieldTransport11Len { - return nil, fmt.Errorf("invalid NFS transport stats 1.1 statement: %v", ss) - } - default: - return nil, fmt.Errorf("unrecognized NFS transport stats version: %q", statVersion) - } - - // Allocate enough for v1.1 stats since zero value for v1.1 stats will be okay - // in a v1.0 response. - // - // Note: slice length must be set to length of v1.1 stats to avoid a panic when - // only v1.0 stats are present. - // See: https://github.com/prometheus/node_exporter/issues/571. - ns := make([]uint64, fieldTransport11Len) - for i, s := range ss { - n, err := strconv.ParseUint(s, 10, 64) - if err != nil { - return nil, err - } - - ns[i] = n - } - - return &NFSTransportStats{ - Port: ns[0], - Bind: ns[1], - Connect: ns[2], - ConnectIdleTime: ns[3], - IdleTime: time.Duration(ns[4]) * time.Second, - Sends: ns[5], - Receives: ns[6], - BadTransactionIDs: ns[7], - CumulativeActiveRequests: ns[8], - CumulativeBacklog: ns[9], - MaximumRPCSlotsUsed: ns[10], - CumulativeSendingQueue: ns[11], - CumulativePendingQueue: ns[12], - }, nil -} |