Temp collector from sysfs hwmon (#8)

* Add collector for hwmon temperature

* Comment out local tag overrides

* Add temperature collector to README

* Update temperature collector with own config parser

collectors/tempMetric.go

@@ -0,0 +1,110 @@
+package collectors
+
+import (
+	"fmt"
+	lp "github.com/influxdata/line-protocol"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+	"encoding/json"
+)
+
+const HWMON_PATH = `/sys/class/hwmon`
+
+
+type TempCollectorConfig struct {
+	ExcludeMetrics []string `json:"exclude_metrics"`
+	TagOverride map[string]map[string]string `json:"tag_override"`
+}
+
+type TempCollector struct {
+	MetricCollector
+	config TempCollectorConfig
+}
+
+func (m *TempCollector) Init(config []byte) error {
+	m.name = "TempCollector"
+	m.setup()
+	m.init = true
+	if len(config) > 0 {
+		err := json.Unmarshal(config, &m.config)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func get_hwmon_sensors() (map[string]map[string]string, error) {
+	var folders []string
+	var sensors map[string]map[string]string
+	sensors = make(map[string]map[string]string)
+	err := filepath.Walk(HWMON_PATH, func(p string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			return nil
+		}
+		folders = append(folders, p)
+		return nil
+	})
+	if err != nil {
+		return sensors, err
+	}
+
+	for _, f := range folders {
+		sensors[f] = make(map[string]string)
+		myp := fmt.Sprintf("%s/", f)
+		err := filepath.Walk(myp, func(path string, info os.FileInfo, err error) error {
+			dir, fname := filepath.Split(path)
+			if strings.Contains(fname, "temp") && strings.Contains(fname, "_input") {
+				namefile := fmt.Sprintf("%s/%s", dir, strings.Replace(fname, "_input", "_label", -1))
+				name, ierr := ioutil.ReadFile(namefile)
+				if ierr == nil {
+					sensors[f][strings.Replace(string(name), "\n", "", -1)] = path
+				}
+			}
+			return nil
+		})
+		if err != nil {
+			continue
+		}
+	}
+	return sensors, nil
+}
+
+func (m *TempCollector) Read(interval time.Duration, out *[]lp.MutableMetric) {
+
+	sensors, err := get_hwmon_sensors()
+	if err != nil {
+		return
+	}
+	for _, files := range sensors {
+		for name, file := range files {
+			tags := map[string]string{"type": "node"}
+			for key, newtags := range m.config.TagOverride {
+				if strings.Contains(file, key) {
+					tags = newtags
+					break
+				}
+			}
+			buffer, err := ioutil.ReadFile(string(file))
+			if err != nil {
+				continue
+			}
+			x, err := strconv.ParseInt(strings.Replace(string(buffer), "\n", "", -1), 0, 64)
+			if err == nil {
+				y, err := lp.New(strings.ToLower(name), tags, map[string]interface{}{"value": float64(x) / 1000}, time.Now())
+				if err == nil {
+					*out = append(*out, y)
+				}
+			}
+		}
+	}
+}
+
+func (m *TempCollector) Close() {
+	m.init = false
+	return
+}