forked from flashcat/categraf
78 lines
2.0 KiB
Go
78 lines
2.0 KiB
Go
//go:build linux
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package netstat
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import (
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"bufio"
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"bytes"
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"fmt"
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"io"
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"strconv"
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"strings"
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"github.com/toolkits/pkg/file"
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)
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// Copyright 2022 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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func (p Proc) Netstat() (*ProcNetstat, error) {
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filename := p.path("net/netstat")
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data, err := file.ReadBytes(filename)
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if err != nil {
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return nil, err
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}
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procNetstat, err := parseNetstat(bytes.NewReader(data), filename)
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procNetstat.PID = p.PID
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return &procNetstat, err
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}
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// parseNetstat parses the metrics from proc/<pid>/net/netstat file
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// and returns a ProcNetstat structure.
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func parseNetstat(r io.Reader, fileName string) (ProcNetstat, error) {
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var (
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scanner = bufio.NewScanner(r)
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procNetstat = ProcNetstat{
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TcpExt: make(map[string]interface{}),
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IpExt: make(map[string]interface{}),
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}
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)
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for scanner.Scan() {
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nameParts := strings.Split(scanner.Text(), " ")
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scanner.Scan()
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valueParts := strings.Split(scanner.Text(), " ")
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// Remove trailing :.
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protocol := strings.TrimSuffix(nameParts[0], ":")
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if len(nameParts) != len(valueParts) {
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return procNetstat, fmt.Errorf("mismatch field count mismatch in %s: %s",
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fileName, protocol)
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}
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for i := 1; i < len(nameParts); i++ {
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value, err := strconv.ParseFloat(valueParts[i], 64)
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if err != nil {
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return procNetstat, err
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}
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key := nameParts[i]
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switch protocol {
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case "TcpExt":
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procNetstat.TcpExt[key] = &value
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case "IpExt":
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procNetstat.IpExt[key] = &value
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}
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}
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}
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return procNetstat, scanner.Err()
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}
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