Collect JSON values recursively

plugins/inputs/jolokia/jolokia.go

@@ -220,6 +220,16 @@ func (j *Jolokia) prepareRequest(server Server, metric Metric) (*http.Request, e
 	return req, nil
 }
 
+func extractValues(measurement string, value interface{}, fields map[string]interface{}) {
+	if mapValues, ok := value.(map[string]interface{}); ok {
+		for k2, v2 := range mapValues {
+			extractValues(measurement+"_"+k2, v2, fields)
+		}
+	} else {
+		fields[measurement] = value
+	}
+}
+
 func (j *Jolokia) Gather(acc telegraf.Accumulator) error {
 	servers := j.Servers
 	metrics := j.Metrics
@@ -244,23 +254,8 @@ func (j *Jolokia) Gather(acc telegraf.Accumulator) error {
 			if err != nil {
 				fmt.Printf("Error handling response: %s\n", err)
 			} else {
-
 				if values, ok := out["value"]; ok {
-					switch t := values.(type) {
+					extractValues(measurement, values, fields)
-					case map[string]interface{}:
-						for k, v := range t {
-							switch t2 := v.(type) {
-							case map[string]interface{}:
-								for k2, v2 := range t2 {
-									fields[measurement+"_"+k+"_"+k2] = v2
-								}
-							case interface{}:
-								fields[measurement+"_"+k] = t2
-							}
-						}
-					case interface{}:
-						fields[measurement] = t
-					}
 				} else {
 					fmt.Printf("Missing key 'value' in output response\n")
 				}

plugins/inputs/jolokia/jolokia_test.go

@@ -12,6 +12,37 @@ import (
 	_ "github.com/stretchr/testify/require"
 )
 
+const validThreeLevelMultiValueJSON = `
+{
+  "request":{
+    "mbean":"java.lang:type=*",
+    "type":"read"
+  },
+  "value":{
+		"java.lang:type=Memory":{
+			"ObjectPendingFinalizationCount":0,
+			"Verbose":false,
+			"HeapMemoryUsage":{
+				"init":134217728,
+				"committed":173015040,
+				"max":1908932608,
+				"used":16840016
+			},
+			"NonHeapMemoryUsage":{
+				"init":2555904,
+				"committed":51380224,
+				"max":-1,
+				"used":49944048
+			},
+			"ObjectName":{
+				"objectName":"java.lang:type=Memory"
+			}
+		}
+  },
+  "timestamp":1446129191,
+  "status":200
+}`
+
 const validMultiValueJSON = `
 {
   "request":{
@@ -103,6 +134,38 @@ func TestHttpJsonMultiValue(t *testing.T) {
 	acc.AssertContainsTaggedFields(t, "jolokia", fields, tags)
 }
 
+// Test that the proper values are ignored or collected
+func TestHttpJsonThreeLevelMultiValue(t *testing.T) {
+	jolokia := genJolokiaClientStub(validThreeLevelMultiValueJSON, 200, Servers, []Metric{HeapMetric})
+
+	var acc testutil.Accumulator
+	err := jolokia.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 1, len(acc.Metrics))
+
+	fields := map[string]interface{}{
+		"heap_memory_usage_java.lang:type=Memory_ObjectPendingFinalizationCount": 0.0,
+		"heap_memory_usage_java.lang:type=Memory_Verbose":                        false,
+		"heap_memory_usage_java.lang:type=Memory_HeapMemoryUsage_init":           134217728.0,
+		"heap_memory_usage_java.lang:type=Memory_HeapMemoryUsage_max":            1908932608.0,
+		"heap_memory_usage_java.lang:type=Memory_HeapMemoryUsage_used":           16840016.0,
+		"heap_memory_usage_java.lang:type=Memory_HeapMemoryUsage_committed":      173015040.0,
+		"heap_memory_usage_java.lang:type=Memory_NonHeapMemoryUsage_init":        2555904.0,
+		"heap_memory_usage_java.lang:type=Memory_NonHeapMemoryUsage_committed":   51380224.0,
+		"heap_memory_usage_java.lang:type=Memory_NonHeapMemoryUsage_max":         -1.0,
+		"heap_memory_usage_java.lang:type=Memory_NonHeapMemoryUsage_used":        49944048.0,
+		"heap_memory_usage_java.lang:type=Memory_ObjectName_objectName":          "java.lang:type=Memory",
+	}
+
+	tags := map[string]string{
+		"jolokia_host": "127.0.0.1",
+		"jolokia_port": "8080",
+		"jolokia_name": "as1",
+	}
+	acc.AssertContainsTaggedFields(t, "jolokia", fields, tags)
+}
+
 // Test that the proper values are ignored or collected
 func TestHttpJsonOn404(t *testing.T) {