telegraf/plugins/inputs/jolokia/jolokia.go

330 lines
8.6 KiB
Go
Raw Blame History

This file contains invisible Unicode characters

This file contains invisible Unicode characters that are indistinguishable to humans but may be processed differently by a computer. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

package jolokia
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"net/url"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
// Default http timeouts
var DefaultResponseHeaderTimeout = internal.Duration{Duration: 3 * time.Second}
var DefaultClientTimeout = internal.Duration{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 internal.Duration `toml:"response_header_timeout"`
ClientTimeout internal.Duration `toml:"client_timeout"`
}
const sampleConfig = `
# DEPRECATED: the jolokia plugin has been deprecated in favor of the
# jolokia2 plugin
# see https://github.com/influxdata/telegraf/tree/master/plugins/inputs/jolokia2
## This is the context root used to compose the jolokia url
## NOTE that Jolokia requires a trailing slash at the end of the context root
## NOTE that your jolokia security policy must allow for POST requests.
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"
## Optional http timeouts
##
## response_header_timeout, if non-zero, specifies the amount of time to wait
## for a server's response headers after fully writing the request.
# response_header_timeout = "3s"
##
## client_timeout specifies a time limit for requests made by this client.
## Includes connection time, any redirects, and reading the response body.
# client_timeout = "4s"
## Attribute delimiter
##
## When multiple attributes are returned for a single
## [inputs.jolokia.metrics], the field name is a concatenation of the metric
## name, and the attribute name, separated by the given delimiter.
# delimiter = "_"
## 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, 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)
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 (j *Jolokia) Gather(acc telegraf.Accumulator) error {
if j.jClient == nil {
log.Println("W! 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: j.ResponseHeaderTimeout.Duration}
j.jClient = &JolokiaClientImpl{&http.Client{
Transport: tr,
Timeout: j.ClientTimeout.Duration,
}}
}
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\n"))
}
}
acc.AddFields("jolokia", fields, tags)
}
return nil
}
func init() {
inputs.Add("jolokia", func() telegraf.Input {
return &Jolokia{
ResponseHeaderTimeout: DefaultResponseHeaderTimeout,
ClientTimeout: DefaultClientTimeout,
Delimiter: "_",
}
})
}