From 6cdcdc77871f9c08be4f4f50d52cb178c429d203 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Tue, 17 Apr 2018 16:21:34 -0400
Subject: add ping

---
 main.go | 44 +++++++++++++++++++++++++++++++++++++-------
 ping.go | 30 ++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+), 7 deletions(-)
 create mode 100644 ping.go

diff --git a/main.go b/main.go
index 9717040..eba5024 100644
--- a/main.go
+++ b/main.go
@@ -63,21 +63,51 @@ func DoAddress(host, network, address string) Point {
 		}
 		return NewPoint("public", tags, map[string]interface{}{"error": err.Error()})
 	}
-	conn, err := net.DialTCP(network, nil, addr)
+
+	var _wg sync.WaitGroup
+	_wg.Add(2)
+	var result_name string
+	var result_version string
+	var result_error error
+	go func() {
+		defer _wg.Done()
+		result_name, result_version, result_error = Hello(addr)
+	}()
+	var result_ping float64
+	go func() {
+		defer _wg.Done()
+		result_ping = Ping(addr.IP)
+	}()
+	_wg.Wait()
+
+	result := map[string]interface{}{}
+	if result_error == nil {
+		result["name"] = result_name
+		result["version"] = result_version
+	} else {
+		result["error"] = result_error
+	}
+	if result_ping >= 0 {
+		result["ping"] = result_ping
+	}
+
+	return NewPoint("public", tags, result)
+}
+
+func Hello(addr *net.TCPAddr) (name, version string, err error) {
+	conn, err := net.DialTCP(addr.Network(), nil, addr)
 	if err != nil {
-		return NewPoint("public", tags, map[string]interface{}{"error": err.Error()})
+		return "", "", err
 	}
+	defer conn.Close()
 	conn.CloseWrite()
 	all, _ := ioutil.ReadAll(conn)
 	line := strings.TrimRight(string(all), "\n")
 	parts := strings.Split(line, " ")
 	if len(parts) != 3 {
-		return NewPoint("public", tags, map[string]interface{}{"error": fmt.Sprintf("malformed ID line: %q", line)})
+		return "", "", fmt.Errorf("malformed ID line: %q", line)
 	}
-	return NewPoint("public", tags, map[string]interface{}{
-		"name":    parts[1],
-		"version": parts[2],
-	})
+	return parts[1], parts[2], nil
 }
 
 func main() {
diff --git a/ping.go b/ping.go
new file mode 100644
index 0000000..a41b4ab
--- /dev/null
+++ b/ping.go
@@ -0,0 +1,30 @@
+package main
+
+import (
+	"net"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+func Ping(ip net.IP) float64 {
+	cmd := exec.Command("ping",
+		"-n", // numeric
+		"-q", // quiet
+		"-c", "1",
+		ip.String())
+	_output, _ := cmd.CombinedOutput()
+	output := string(_output)
+	for _, line := range strings.Split(output, "\n") {
+		if !strings.HasPrefix(line, "rtt min/avg/max/mdev = ") {
+			continue
+		}
+		values := strings.TrimPrefix(line, "rtt min/avg/max/mdev = ")
+		value, err := strconv.ParseFloat(strings.Split(values, "/")[0], 64)
+		if err != nil {
+			continue
+		}
+		return value
+	}
+	return -1
+}
-- 
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