package jolokia import ( "bytes" "encoding/json" "errors" "fmt" "io/ioutil" "net/http" "net/url" "time" "github.com/influxdata/telegraf" "github.com/influxdata/telegraf/plugins/inputs" ) type Server struct { Name string Host string Username string Password string Port string } type Metric struct { Name string Mbean string Attribute string Path string } type JolokiaClient interface { MakeRequest(req *http.Request) (*http.Response, error) } type JolokiaClientImpl struct { client *http.Client } func (c JolokiaClientImpl) MakeRequest(req *http.Request) (*http.Response, error) { return c.client.Do(req) } type Jolokia struct { jClient JolokiaClient Context string Mode string Servers []Server Metrics []Metric Proxy Server } const sampleConfig = ` ## This is the context root used to compose the jolokia url context = "/jolokia" ## This specifies the mode used # mode = "proxy" # ## When in proxy mode this section is used to specify further ## proxy address configurations. ## Remember to change host address to fit your environment. # [inputs.jolokia.proxy] # host = "127.0.0.1" # port = "8080" ## List of servers exposing jolokia read service [[inputs.jolokia.servers]] name = "as-server-01" host = "127.0.0.1" port = "8080" # username = "myuser" # password = "mypassword" ## List of metrics collected on above servers ## Each metric consists in a name, a jmx path and either ## a pass or drop slice attribute. ## This collect all heap memory usage metrics. [[inputs.jolokia.metrics]] name = "heap_memory_usage" mbean = "java.lang:type=Memory" attribute = "HeapMemoryUsage" ## This collect thread counts metrics. [[inputs.jolokia.metrics]] name = "thread_count" mbean = "java.lang:type=Threading" attribute = "TotalStartedThreadCount,ThreadCount,DaemonThreadCount,PeakThreadCount" ## This collect number of class loaded/unloaded counts metrics. [[inputs.jolokia.metrics]] name = "class_count" mbean = "java.lang:type=ClassLoading" attribute = "LoadedClassCount,UnloadedClassCount,TotalLoadedClassCount" ` func (j *Jolokia) SampleConfig() string { return sampleConfig } func (j *Jolokia) Description() string { return "Read JMX metrics through Jolokia" } func (j *Jolokia) doRequest(req *http.Request) (map[string]interface{}, error) { resp, err := j.jClient.MakeRequest(req) if err != nil { return nil, err } defer resp.Body.Close() // Process response if resp.StatusCode != http.StatusOK { err = fmt.Errorf("Response from url \"%s\" has status code %d (%s), expected %d (%s)", req.RequestURI, resp.StatusCode, http.StatusText(resp.StatusCode), http.StatusOK, http.StatusText(http.StatusOK)) return nil, err } // read body body, err := ioutil.ReadAll(resp.Body) if err != nil { return nil, err } // Unmarshal json 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 jsonOut, nil } func (j *Jolokia) prepareRequest(server Server, metric Metric) (*http.Request, error) { var jolokiaUrl *url.URL context := j.Context // Usually "/jolokia" // 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 } } // 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, } if server.Username != "" { target["user"] = server.Username } if server.Password != "" { target["password"] = server.Password } bodyContent["target"] = target 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) } 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) } jolokiaUrl = serverUrl } requestBody, err := json.Marshal(bodyContent) req, err := http.NewRequest("POST", jolokiaUrl.String(), bytes.NewBuffer(requestBody)) if err != nil { return nil, err } req.Header.Add("Content-type", "application/json") return req, nil } func (j *Jolokia) Gather(acc telegraf.Accumulator) error { servers := j.Servers metrics := j.Metrics tags := make(map[string]string) for _, server := range servers { tags["jolokia_name"] = server.Name tags["jolokia_port"] = server.Port tags["jolokia_host"] = server.Host fields := make(map[string]interface{}) for _, metric := range metrics { measurement := metric.Name req, err := j.prepareRequest(server, metric) if err != nil { return err } out, err := j.doRequest(req) if err != nil { fmt.Printf("Error handling response: %s\n", err) } else { if values, ok := out["value"]; ok { switch t := values.(type) { case map[string]interface{}: for k, v := range t { fields[measurement+"_"+k] = v } case interface{}: fields[measurement] = t } } else { fmt.Printf("Missing key 'value' in output response\n") } } } acc.AddFields("jolokia", fields, tags) } return nil } func init() { inputs.Add("jolokia", func() telegraf.Input { tr := &http.Transport{ResponseHeaderTimeout: time.Duration(3 * time.Second)} client := &http.Client{ Transport: tr, Timeout: time.Duration(4 * time.Second), } return &Jolokia{jClient: &JolokiaClientImpl{client: client}} }) }