[VOL-4290] Voltha go library updates for gRPC migration
Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/prometheus/procfs/proc_fdinfo.go b/vendor/github.com/prometheus/procfs/proc_fdinfo.go
new file mode 100644
index 0000000..cf63227
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/proc_fdinfo.go
@@ -0,0 +1,133 @@
+// Copyright 2019 The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package procfs
+
+import (
+ "bufio"
+ "bytes"
+ "fmt"
+ "regexp"
+
+ "github.com/prometheus/procfs/internal/util"
+)
+
+// Regexp variables
+var (
+ rPos = regexp.MustCompile(`^pos:\s+(\d+)$`)
+ rFlags = regexp.MustCompile(`^flags:\s+(\d+)$`)
+ rMntID = regexp.MustCompile(`^mnt_id:\s+(\d+)$`)
+ rInotify = regexp.MustCompile(`^inotify`)
+ rInotifyParts = regexp.MustCompile(`^inotify\s+wd:([0-9a-f]+)\s+ino:([0-9a-f]+)\s+sdev:([0-9a-f]+)(?:\s+mask:([0-9a-f]+))?`)
+)
+
+// ProcFDInfo contains represents file descriptor information.
+type ProcFDInfo struct {
+ // File descriptor
+ FD string
+ // File offset
+ Pos string
+ // File access mode and status flags
+ Flags string
+ // Mount point ID
+ MntID string
+ // List of inotify lines (structured) in the fdinfo file (kernel 3.8+ only)
+ InotifyInfos []InotifyInfo
+}
+
+// FDInfo constructor. On kernels older than 3.8, InotifyInfos will always be empty.
+func (p Proc) FDInfo(fd string) (*ProcFDInfo, error) {
+ data, err := util.ReadFileNoStat(p.path("fdinfo", fd))
+ if err != nil {
+ return nil, err
+ }
+
+ var text, pos, flags, mntid string
+ var inotify []InotifyInfo
+
+ scanner := bufio.NewScanner(bytes.NewReader(data))
+ for scanner.Scan() {
+ text = scanner.Text()
+ if rPos.MatchString(text) {
+ pos = rPos.FindStringSubmatch(text)[1]
+ } else if rFlags.MatchString(text) {
+ flags = rFlags.FindStringSubmatch(text)[1]
+ } else if rMntID.MatchString(text) {
+ mntid = rMntID.FindStringSubmatch(text)[1]
+ } else if rInotify.MatchString(text) {
+ newInotify, err := parseInotifyInfo(text)
+ if err != nil {
+ return nil, err
+ }
+ inotify = append(inotify, *newInotify)
+ }
+ }
+
+ i := &ProcFDInfo{
+ FD: fd,
+ Pos: pos,
+ Flags: flags,
+ MntID: mntid,
+ InotifyInfos: inotify,
+ }
+
+ return i, nil
+}
+
+// InotifyInfo represents a single inotify line in the fdinfo file.
+type InotifyInfo struct {
+ // Watch descriptor number
+ WD string
+ // Inode number
+ Ino string
+ // Device ID
+ Sdev string
+ // Mask of events being monitored
+ Mask string
+}
+
+// InotifyInfo constructor. Only available on kernel 3.8+.
+func parseInotifyInfo(line string) (*InotifyInfo, error) {
+ m := rInotifyParts.FindStringSubmatch(line)
+ if len(m) >= 4 {
+ var mask string
+ if len(m) == 5 {
+ mask = m[4]
+ }
+ i := &InotifyInfo{
+ WD: m[1],
+ Ino: m[2],
+ Sdev: m[3],
+ Mask: mask,
+ }
+ return i, nil
+ }
+ return nil, fmt.Errorf("invalid inode entry: %q", line)
+}
+
+// ProcFDInfos represents a list of ProcFDInfo structs.
+type ProcFDInfos []ProcFDInfo
+
+func (p ProcFDInfos) Len() int { return len(p) }
+func (p ProcFDInfos) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
+func (p ProcFDInfos) Less(i, j int) bool { return p[i].FD < p[j].FD }
+
+// InotifyWatchLen returns the total number of inotify watches
+func (p ProcFDInfos) InotifyWatchLen() (int, error) {
+ length := 0
+ for _, f := range p {
+ length += len(f.InotifyInfos)
+ }
+
+ return length, nil
+}