Add cdp support for xpath scrapers (#625)

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

vendor/github.com/knq/sysutil/.travis.yml

@@ -0,0 +1,6 @@
+dist: bionic
+language: go
+go:
+  - 1.13.x
+script:
+  - go test -v -coverprofile=coverage.out

vendor/github.com/knq/sysutil/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2016-2017 Kenneth Shaw
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/knq/sysutil/README.md

@@ -0,0 +1,6 @@
+# About sysutil
+
+Package sysutil provides some utilities for working with cross platform
+systems.
+
+Inspired by the Go version of Sigar, but written to be "idiomatic" Go.

vendor/github.com/knq/sysutil/go.mod

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+module github.com/knq/sysutil
+
+go 1.13

vendor/github.com/knq/sysutil/sysutil.go

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+package sysutil
+
+import "time"
+
+var btime time.Time
+
+// BootTime returns the time the system was started.
+func BootTime() time.Time {
+	return btime
+}
+
+// Uptime returns the duration the system has been up.
+func Uptime() time.Duration {
+	return time.Now().Sub(btime)
+}

vendor/github.com/knq/sysutil/sysutil_bsd.go

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+// +build darwin freebsd openbsd netbsd
+
+package sysutil
+
+import (
+	"bytes"
+	"encoding/binary"
+	"syscall"
+	"time"
+)
+
+func init() {
+	var err error
+
+	// get boot time
+	res, err := syscall.Sysctl("kern.boottime")
+	if err != nil {
+		btime = time.Now()
+		return
+	}
+
+	// decode
+	var t timeval
+	err = binary.Read(bytes.NewBuffer([]byte(res)), binary.LittleEndian, &t)
+	if err != nil {
+		btime = time.Now()
+		return
+	}
+
+	btime = time.Unix(int64(t.Sec), int64(t.Usec))
+}

vendor/github.com/knq/sysutil/sysutil_linux.go

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+// +build linux
+
+package sysutil
+
+import (
+	"bytes"
+	"io/ioutil"
+	"strconv"
+	"time"
+)
+
+var (
+	btimePrefix = []byte("btime ")
+	lineEnd     = []byte("\n")
+)
+
+func init() {
+	buf, err := ioutil.ReadFile("/proc/stat")
+	if err != nil {
+		btime = time.Now()
+		return
+	}
+
+	for _, line := range bytes.SplitN(buf, lineEnd, -1) {
+		if bytes.HasPrefix(line, btimePrefix) {
+			t, err := strconv.ParseInt(string(line[len(btimePrefix):]), 10, 64)
+			if err != nil {
+				btime = time.Now()
+				return
+			}
+
+			btime = time.Unix(t, 0)
+			break
+		}
+	}
+}

vendor/github.com/knq/sysutil/sysutil_other.go

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+// +build !linux,!windows,!darwin,!freebsd,!openbsd,!netbsd
+
+package sysutil
+
+import "time"
+
+func init() {
+	btime = time.Now()
+}

vendor/github.com/knq/sysutil/sysutil_windows.go

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+// +build windows
+
+package sysutil
+
+import (
+	"syscall"
+	"time"
+)
+
+var (
+	kernel32DLL        = syscall.MustLoadDLL("kernel32")
+	procGetTickCount64 = kernel32DLL.MustFindProc("GetTickCount64")
+)
+
+func init() {
+	res, _, err := syscall.Syscall(procGetTickCount64.Addr(), 0, 0, 0, 0)
+	if err != 0 {
+		btime = time.Now()
+		return
+	}
+
+	btime = time.Now().Add(time.Duration(-res) * time.Millisecond)
+}

vendor/github.com/knq/sysutil/timeval.go

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+// +build openbsd netbsd
+
+package sysutil
+
+import (
+	"syscall"
+)
+
+type timeval syscall.Timeval

vendor/github.com/knq/sysutil/timeval32.go

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+// +build darwin freebsd
+
+package sysutil
+
+type timeval struct {
+	Sec  int32
+	Usec int32
+}