/
jolokia.go
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/
jolokia.go
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//go:generate ../../../tools/readme_config_includer/generator
package jolokia
import (
"bytes"
_ "embed"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/config"
"github.com/influxdata/telegraf/plugins/inputs"
)
// DO NOT REMOVE THE NEXT TWO LINES! This is required to embed the sampleConfig data.
//go:embed sample.conf
var sampleConfig string
// Default http timeouts
var DefaultResponseHeaderTimeout = config.Duration(3 * time.Second)
var DefaultClientTimeout = config.Duration(4 * time.Second)
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
Delimiter string
ResponseHeaderTimeout config.Duration `toml:"response_header_timeout"`
ClientTimeout config.Duration `toml:"client_timeout"`
Log telegraf.Logger `toml:"-"`
}
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 := io.ReadAll(resp.Body)
if err != nil {
return nil, err
}
// Unmarshal json
var jsonOut []map[string]interface{}
if err = json.Unmarshal(body, &jsonOut); err != nil {
return nil, fmt.Errorf("error decoding JSON response: %s: %s", err, body)
}
return jsonOut, nil
}
func (j *Jolokia) prepareRequest(server Server, metrics []Metric) (*http.Request, error) {
var jolokiaURL *url.URL
context := j.Context // Usually "/jolokia/"
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
}
}
// 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
}
bulkBodyContent = append(bulkBodyContent, bodyContent)
}
requestBody, err := json.Marshal(bulkBodyContent)
if err != nil {
return nil, err
}
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) extractValues(measurement string, value interface{}, fields map[string]interface{}) {
if mapValues, ok := value.(map[string]interface{}); ok {
for k2, v2 := range mapValues {
j.extractValues(measurement+j.Delimiter+k2, v2, fields)
}
} else {
fields[measurement] = value
}
}
func (*Jolokia) SampleConfig() string {
return sampleConfig
}
func (j *Jolokia) Gather(acc telegraf.Accumulator) error {
if j.jClient == nil {
j.Log.Warn("DEPRECATED: the jolokia plugin has been deprecated " +
"in favor of the jolokia2 plugin " +
"(https://github.com/influxdata/telegraf/tree/master/plugins/inputs/jolokia2)")
tr := &http.Transport{ResponseHeaderTimeout: time.Duration(j.ResponseHeaderTimeout)}
j.jClient = &JolokiaClientImpl{&http.Client{
Transport: tr,
Timeout: time.Duration(j.ClientTimeout),
}}
}
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{})
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
}
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
}
if values, ok := resp["value"]; ok {
j.extractValues(metrics[i].Name, values, fields)
} else {
acc.AddError(fmt.Errorf("missing key 'value' in output response"))
}
}
acc.AddFields("jolokia", fields, tags)
}
return nil
}
func init() {
inputs.Add("jolokia", func() telegraf.Input {
return &Jolokia{
ResponseHeaderTimeout: DefaultResponseHeaderTimeout,
ClientTimeout: DefaultClientTimeout,
Delimiter: "_",
}
})
}