[VOL-4291] Rw-core updates for gRPC migration
Change-Id: I8d5a554409115b29318089671ca4e1ab3fa98810
diff --git a/vendor/github.com/prometheus/procfs/net_sockstat.go b/vendor/github.com/prometheus/procfs/net_sockstat.go
new file mode 100644
index 0000000..e36f487
--- /dev/null
+++ b/vendor/github.com/prometheus/procfs/net_sockstat.go
@@ -0,0 +1,163 @@
+// 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"
+ "errors"
+ "fmt"
+ "io"
+ "strings"
+
+ "github.com/prometheus/procfs/internal/util"
+)
+
+// A NetSockstat contains the output of /proc/net/sockstat{,6} for IPv4 or IPv6,
+// respectively.
+type NetSockstat struct {
+ // Used is non-nil for IPv4 sockstat results, but nil for IPv6.
+ Used *int
+ Protocols []NetSockstatProtocol
+}
+
+// A NetSockstatProtocol contains statistics about a given socket protocol.
+// Pointer fields indicate that the value may or may not be present on any
+// given protocol.
+type NetSockstatProtocol struct {
+ Protocol string
+ InUse int
+ Orphan *int
+ TW *int
+ Alloc *int
+ Mem *int
+ Memory *int
+}
+
+// NetSockstat retrieves IPv4 socket statistics.
+func (fs FS) NetSockstat() (*NetSockstat, error) {
+ return readSockstat(fs.proc.Path("net", "sockstat"))
+}
+
+// NetSockstat6 retrieves IPv6 socket statistics.
+//
+// If IPv6 is disabled on this kernel, the returned error can be checked with
+// os.IsNotExist.
+func (fs FS) NetSockstat6() (*NetSockstat, error) {
+ return readSockstat(fs.proc.Path("net", "sockstat6"))
+}
+
+// readSockstat opens and parses a NetSockstat from the input file.
+func readSockstat(name string) (*NetSockstat, error) {
+ // This file is small and can be read with one syscall.
+ b, err := util.ReadFileNoStat(name)
+ if err != nil {
+ // Do not wrap this error so the caller can detect os.IsNotExist and
+ // similar conditions.
+ return nil, err
+ }
+
+ stat, err := parseSockstat(bytes.NewReader(b))
+ if err != nil {
+ return nil, fmt.Errorf("failed to read sockstats from %q: %w", name, err)
+ }
+
+ return stat, nil
+}
+
+// parseSockstat reads the contents of a sockstat file and parses a NetSockstat.
+func parseSockstat(r io.Reader) (*NetSockstat, error) {
+ var stat NetSockstat
+ s := bufio.NewScanner(r)
+ for s.Scan() {
+ // Expect a minimum of a protocol and one key/value pair.
+ fields := strings.Split(s.Text(), " ")
+ if len(fields) < 3 {
+ return nil, fmt.Errorf("malformed sockstat line: %q", s.Text())
+ }
+
+ // The remaining fields are key/value pairs.
+ kvs, err := parseSockstatKVs(fields[1:])
+ if err != nil {
+ return nil, fmt.Errorf("error parsing sockstat key/value pairs from %q: %w", s.Text(), err)
+ }
+
+ // The first field is the protocol. We must trim its colon suffix.
+ proto := strings.TrimSuffix(fields[0], ":")
+ switch proto {
+ case "sockets":
+ // Special case: IPv4 has a sockets "used" key/value pair that we
+ // embed at the top level of the structure.
+ used := kvs["used"]
+ stat.Used = &used
+ default:
+ // Parse all other lines as individual protocols.
+ nsp := parseSockstatProtocol(kvs)
+ nsp.Protocol = proto
+ stat.Protocols = append(stat.Protocols, nsp)
+ }
+ }
+
+ if err := s.Err(); err != nil {
+ return nil, err
+ }
+
+ return &stat, nil
+}
+
+// parseSockstatKVs parses a string slice into a map of key/value pairs.
+func parseSockstatKVs(kvs []string) (map[string]int, error) {
+ if len(kvs)%2 != 0 {
+ return nil, errors.New("odd number of fields in key/value pairs")
+ }
+
+ // Iterate two values at a time to gather key/value pairs.
+ out := make(map[string]int, len(kvs)/2)
+ for i := 0; i < len(kvs); i += 2 {
+ vp := util.NewValueParser(kvs[i+1])
+ out[kvs[i]] = vp.Int()
+
+ if err := vp.Err(); err != nil {
+ return nil, err
+ }
+ }
+
+ return out, nil
+}
+
+// parseSockstatProtocol parses a NetSockstatProtocol from the input kvs map.
+func parseSockstatProtocol(kvs map[string]int) NetSockstatProtocol {
+ var nsp NetSockstatProtocol
+ for k, v := range kvs {
+ // Capture the range variable to ensure we get unique pointers for
+ // each of the optional fields.
+ v := v
+ switch k {
+ case "inuse":
+ nsp.InUse = v
+ case "orphan":
+ nsp.Orphan = &v
+ case "tw":
+ nsp.TW = &v
+ case "alloc":
+ nsp.Alloc = &v
+ case "mem":
+ nsp.Mem = &v
+ case "memory":
+ nsp.Memory = &v
+ }
+ }
+
+ return nsp
+}