Add temp input plugin (#4411)

plugins/inputs/temp/README.md

@@ -0,0 +1,32 @@
+# Temp Input plugin
+
+This input plugin collect temperature.
+
+### Configuration:
+
+```
+[[inputs.temp]]
+```
+
+### Measurements & Fields:
+
+All fields are float64.
+
+- temp ( unit: °Celsius)
+
+### Tags:
+
+- All measurements have the following tags:
+    - host
+    - sensor
+
+### Example Output:
+
+```
+$ ./telegraf --config telegraf.conf --input-filter temp --test
+* Plugin: temp, Collection 1
+> temp,host=localhost,sensor=coretemp_physicalid0_crit temp=100 1531298763000000000
+> temp,host=localhost,sensor=coretemp_physicalid0_critalarm temp=0 1531298763000000000
+> temp,host=localhost,sensor=coretemp_physicalid0_input temp=100 1531298763000000000
+> temp,host=localhost,sensor=coretemp_physicalid0_max temp=100 1531298763000000000
+```

plugins/inputs/temp/temp.go

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+package temp
+
+import (
+	"fmt"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/system"
+)
+
+type Temperature struct {
+	ps system.PS
+}
+
+func (t *Temperature) Description() string {
+	return "Read metrics about temperature"
+}
+
+const sampleConfig = ""
+
+func (t *Temperature) SampleConfig() string {
+	return sampleConfig
+}
+
+func (t *Temperature) Gather(acc telegraf.Accumulator) error {
+	temps, err := t.ps.Temperature()
+	if err != nil {
+		return fmt.Errorf("error getting temperatures info: %s", err)
+	}
+	for _, temp := range temps {
+		tags := map[string]string{
+			"sensor": temp.SensorKey,
+		}
+		fields := map[string]interface{}{
+			"temp": temp.Temperature,
+		}
+		acc.AddFields("temp", fields, tags)
+	}
+	return nil
+}
+
+func init() {
+	inputs.Add("temp", func() telegraf.Input {
+		return &Temperature{ps: system.NewSystemPS()}
+	})
+}

plugins/inputs/temp/temp_test.go

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+package temp
+
+import (
+	"testing"
+
+	"github.com/shirou/gopsutil/host"
+	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/plugins/inputs/system"
+	"github.com/influxdata/telegraf/testutil"
+)
+
+func TestTemperature(t *testing.T) {
+	var mps system.MockPS
+	var err error
+	defer mps.AssertExpectations(t)
+	var acc testutil.Accumulator
+
+	ts := host.TemperatureStat{
+		SensorKey:   "coretemp_sensor1_crit",
+		Temperature: 60.5,
+	}
+
+	mps.On("Temperature").Return([]host.TemperatureStat{ts}, nil)
+
+	err = (&Temperature{ps: &mps}).Gather(&acc)
+	require.NoError(t, err)
+
+	expectedFields := map[string]interface{}{
+		"temp": float64(60.5),
+	}
+
+	expectedTags := map[string]string{
+		"sensor": "coretemp_sensor1_crit",
+	}
+	acc.AssertContainsTaggedFields(t, "temp", expectedFields, expectedTags)
+
+}