change jolokia input to use bulk requests (influxdata#2253)

vlamug · May 30, 2017 · 756b7e4 · 756b7e4
1 parent ff511a1
commit 756b7e4
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Showing 3 changed files with 202 additions and 126 deletions.
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -73,6 +73,7 @@ be deprecated eventually.
 - [#1820](https://github.com/influxdata/telegraf/issues/1820): easier plugin testing without outputs
 - [#2493](https://github.com/influxdata/telegraf/pull/2493): Check signature in the GitHub webhook plugin
 - [#2038](https://github.com/influxdata/telegraf/issues/2038): Add papertrail support to webhooks
+- [#2253](https://github.com/influxdata/telegraf/pull/2253): Change jolokia plugin to use bulk requests.
 
 ### Bugfixes
 

diff --git a/plugins/inputs/jolokia/jolokia.go b/plugins/inputs/jolokia/jolokia.go
@@ -3,7 +3,6 @@ package jolokia
 import (
 	"bytes"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -130,7 +129,7 @@ func (j *Jolokia) Description() string {
 	return "Read JMX metrics through Jolokia"
 }
 
-func (j *Jolokia) doRequest(req *http.Request) (map[string]interface{}, error) {
+func (j *Jolokia) doRequest(req *http.Request) ([]map[string]interface{}, error) {
 	resp, err := j.jClient.MakeRequest(req)
 	if err != nil {
 		return nil, err
@@ -155,85 +154,81 @@ func (j *Jolokia) doRequest(req *http.Request) (map[string]interface{}, error) {
 	}
 
 	// Unmarshal json
-	var jsonOut map[string]interface{}
+	var jsonOut []map[string]interface{}
 	if err = json.Unmarshal([]byte(body), &jsonOut); err != nil {
-		return nil, errors.New("Error decoding JSON response")
-	}
-
-	if status, ok := jsonOut["status"]; ok {
-		if status != float64(200) {
-			return nil, fmt.Errorf("Not expected status value in response body: %3.f",
-				status)
-		}
-	} else {
-		return nil, fmt.Errorf("Missing status in response body")
+		return nil, fmt.Errorf("Error decoding JSON response: %s: %s", err, body)
 	}
 
 	return jsonOut, nil
 }
 
-func (j *Jolokia) prepareRequest(server Server, metric Metric) (*http.Request, error) {
+func (j *Jolokia) prepareRequest(server Server, metrics []Metric) (*http.Request, error) {
 	var jolokiaUrl *url.URL
 	context := j.Context // Usually "/jolokia/"
 
-	// Create bodyContent
-	bodyContent := map[string]interface{}{
-		"type":  "read",
-		"mbean": metric.Mbean,
-	}
+	var bulkBodyContent []map[string]interface{}
+	for _, metric := range metrics {
+		// Create bodyContent
+		bodyContent := map[string]interface{}{
+			"type":  "read",
+			"mbean": metric.Mbean,
+		}
 
-	if metric.Attribute != "" {
-		bodyContent["attribute"] = metric.Attribute
-		if metric.Path != "" {
-			bodyContent["path"] = metric.Path
+		if metric.Attribute != "" {
+			bodyContent["attribute"] = metric.Attribute
+			if metric.Path != "" {
+				bodyContent["path"] = metric.Path
+			}
 		}
-	}
 
-	// Add target, only in proxy mode
-	if j.Mode == "proxy" {
-		serviceUrl := fmt.Sprintf("service:jmx:rmi:///jndi/rmi://%s:%s/jmxrmi",
-			server.Host, server.Port)
+		// Add target, only in proxy mode
+		if j.Mode == "proxy" {
+			serviceUrl := fmt.Sprintf("service:jmx:rmi:///jndi/rmi://%s:%s/jmxrmi",
+				server.Host, server.Port)
 
-		target := map[string]string{
-			"url": serviceUrl,
-		}
+			target := map[string]string{
+				"url": serviceUrl,
+			}
 
-		if server.Username != "" {
-			target["user"] = server.Username
-		}
+			if server.Username != "" {
+				target["user"] = server.Username
+			}
 
-		if server.Password != "" {
-			target["password"] = server.Password
-		}
+			if server.Password != "" {
+				target["password"] = server.Password
+			}
 
-		bodyContent["target"] = target
+			bodyContent["target"] = target
 
-		proxy := j.Proxy
+			proxy := j.Proxy
 
-		// Prepare ProxyURL
-		proxyUrl, err := url.Parse("http://" + proxy.Host + ":" + proxy.Port + context)
-		if err != nil {
-			return nil, err
-		}
-		if proxy.Username != "" || proxy.Password != "" {
-			proxyUrl.User = url.UserPassword(proxy.Username, proxy.Password)
-		}
+			// Prepare ProxyURL
+			proxyUrl, err := url.Parse("http://" + proxy.Host + ":" + proxy.Port + context)
+			if err != nil {
+				return nil, err
+			}
+			if proxy.Username != "" || proxy.Password != "" {
+				proxyUrl.User = url.UserPassword(proxy.Username, proxy.Password)
+			}
 
-		jolokiaUrl = proxyUrl
+			jolokiaUrl = proxyUrl
 
-	} else {
-		serverUrl, err := url.Parse("http://" + server.Host + ":" + server.Port + context)
-		if err != nil {
-			return nil, err
-		}
-		if server.Username != "" || server.Password != "" {
-			serverUrl.User = url.UserPassword(server.Username, server.Password)
+		} else {
+			serverUrl, err := url.Parse("http://" + server.Host + ":" + server.Port + context)
+			if err != nil {
+				return nil, err
+			}
+			if server.Username != "" || server.Password != "" {
+				serverUrl.User = url.UserPassword(server.Username, server.Password)
+			}
+
+			jolokiaUrl = serverUrl
 		}
 
-		jolokiaUrl = serverUrl
+		bulkBodyContent = append(bulkBodyContent, bodyContent)
 	}
 
-	requestBody, err := json.Marshal(bodyContent)
+	requestBody, err := json.Marshal(bulkBodyContent)
 
 	req, err := http.NewRequest("POST", jolokiaUrl.String(), bytes.NewBuffer(requestBody))
 
@@ -276,25 +271,35 @@ func (j *Jolokia) Gather(acc telegraf.Accumulator) error {
 		tags["jolokia_host"] = server.Host
 		fields := make(map[string]interface{})
 
-		for _, metric := range metrics {
-			measurement := metric.Name
+		req, err := j.prepareRequest(server, metrics)
+		if err != nil {
+			acc.AddError(fmt.Errorf("unable to create request: %s", err))
+			continue
+		}
+		out, err := j.doRequest(req)
+		if err != nil {
+			acc.AddError(fmt.Errorf("error performing request: %s", err))
+			continue
+		}
 
-			req, err := j.prepareRequest(server, metric)
-			if err != nil {
-				return err
+		if len(out) != len(metrics) {
+			acc.AddError(fmt.Errorf("did not receive the correct number of metrics in response. expected %d, received %d", len(metrics), len(out)))
+			continue
+		}
+		for i, resp := range out {
+			if status, ok := resp["status"]; ok && status != float64(200) {
+				acc.AddError(fmt.Errorf("Not expected status value in response body (%s:%s mbean=\"%s\" attribute=\"%s\"): %3.f",
+					server.Host, server.Port, metrics[i].Mbean, metrics[i].Attribute, status))
+				continue
+			} else if !ok {
+				acc.AddError(fmt.Errorf("Missing status in response body"))
+				continue
 			}
 
-			out, err := j.doRequest(req)
-
-			if err != nil {
-				fmt.Printf("Error handling response: %s\n", err)
+			if values, ok := resp["value"]; ok {
+				j.extractValues(metrics[i].Name, values, fields)
 			} else {
-				if values, ok := out["value"]; ok {
-					j.extractValues(measurement, values, fields)
-				} else {
-					fmt.Printf("Missing key 'value' in output response\n")
-				}
-
+				acc.AddError(fmt.Errorf("Missing key 'value' in output response\n"))
 			}
 		}