rebase: vendor dependencies for Vault API

Uses github.com/libopenstorage/secrets to communicate with Vault. This
removes the need for maintaining our own limited Vault APIs.

By adding the new dependency, several other packages got updated in the
process. Unused indirect dependencies have been removed from go.mod.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

vendor/github.com/prometheus/procfs/net_softnet.go

@@ -14,89 +14,78 @@
 package procfs
 
 import (
-	"bufio"
-	"bytes"
 	"fmt"
-	"io"
+	"io/ioutil"
 	"strconv"
 	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
 )
 
 // For the proc file format details,
-// See:
-// * Linux 2.6.23 https://elixir.bootlin.com/linux/v2.6.23/source/net/core/dev.c#L2343
-// * Linux 4.17 https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
+// see https://elixir.bootlin.com/linux/v4.17/source/net/core/net-procfs.c#L162
 // and https://elixir.bootlin.com/linux/v4.17/source/include/linux/netdevice.h#L2810.
 
-// SoftnetStat contains a single row of data from /proc/net/softnet_stat
-type SoftnetStat struct {
+// SoftnetEntry contains a single row of data from /proc/net/softnet_stat
+type SoftnetEntry struct {
 	// Number of processed packets
-	Processed uint32
+	Processed uint
 	// Number of dropped packets
-	Dropped uint32
+	Dropped uint
 	// Number of times processing packets ran out of quota
-	TimeSqueezed uint32
+	TimeSqueezed uint
 }
 
-var softNetProcFile = "net/softnet_stat"
-
-// NetSoftnetStat reads data from /proc/net/softnet_stat.
-func (fs FS) NetSoftnetStat() ([]SoftnetStat, error) {
-	b, err := util.ReadFileNoStat(fs.proc.Path(softNetProcFile))
+// GatherSoftnetStats reads /proc/net/softnet_stat, parse the relevant columns,
+// and then return a slice of SoftnetEntry's.
+func (fs FS) GatherSoftnetStats() ([]SoftnetEntry, error) {
+	data, err := ioutil.ReadFile(fs.proc.Path("net/softnet_stat"))
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("error reading softnet %s: %s", fs.proc.Path("net/softnet_stat"), err)
 	}
 
-	entries, err := parseSoftnet(bytes.NewReader(b))
-	if err != nil {
-		return nil, fmt.Errorf("failed to parse /proc/net/softnet_stat: %v", err)
+	return parseSoftnetEntries(data)
+}
+
+func parseSoftnetEntries(data []byte) ([]SoftnetEntry, error) {
+	lines := strings.Split(string(data), "\n")
+	entries := make([]SoftnetEntry, 0)
+	var err error
+	const (
+		expectedColumns = 11
+	)
+	for _, line := range lines {
+		columns := strings.Fields(line)
+		width := len(columns)
+		if width == 0 {
+			continue
+		}
+		if width != expectedColumns {
+			return []SoftnetEntry{}, fmt.Errorf("%d columns were detected, but %d were expected", width, expectedColumns)
+		}
+		var entry SoftnetEntry
+		if entry, err = parseSoftnetEntry(columns); err != nil {
+			return []SoftnetEntry{}, err
+		}
+		entries = append(entries, entry)
 	}
 
 	return entries, nil
 }
 
-func parseSoftnet(r io.Reader) ([]SoftnetStat, error) {
-	const minColumns = 9
-
-	s := bufio.NewScanner(r)
-
-	var stats []SoftnetStat
-	for s.Scan() {
-		columns := strings.Fields(s.Text())
-		width := len(columns)
-
-		if width < minColumns {
-			return nil, fmt.Errorf("%d columns were detected, but at least %d were expected", width, minColumns)
-		}
-
-		// We only parse the first three columns at the moment.
-		us, err := parseHexUint32s(columns[0:3])
-		if err != nil {
-			return nil, err
-		}
-
-		stats = append(stats, SoftnetStat{
-			Processed:    us[0],
-			Dropped:      us[1],
-			TimeSqueezed: us[2],
-		})
+func parseSoftnetEntry(columns []string) (SoftnetEntry, error) {
+	var err error
+	var processed, dropped, timeSqueezed uint64
+	if processed, err = strconv.ParseUint(columns[0], 16, 32); err != nil {
+		return SoftnetEntry{}, fmt.Errorf("Unable to parse column 0: %s", err)
 	}
-
-	return stats, nil
-}
-
-func parseHexUint32s(ss []string) ([]uint32, error) {
-	us := make([]uint32, 0, len(ss))
-	for _, s := range ss {
-		u, err := strconv.ParseUint(s, 16, 32)
-		if err != nil {
-			return nil, err
-		}
-
-		us = append(us, uint32(u))
+	if dropped, err = strconv.ParseUint(columns[1], 16, 32); err != nil {
+		return SoftnetEntry{}, fmt.Errorf("Unable to parse column 1: %s", err)
 	}
-
-	return us, nil
+	if timeSqueezed, err = strconv.ParseUint(columns[2], 16, 32); err != nil {
+		return SoftnetEntry{}, fmt.Errorf("Unable to parse column 2: %s", err)
+	}
+	return SoftnetEntry{
+		Processed:    uint(processed),
+		Dropped:      uint(dropped),
+		TimeSqueezed: uint(timeSqueezed),
+	}, nil
 }