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nsq.go
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nsq.go
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// The MIT License (MIT)
//
// Copyright (c) 2015 Jeff Nickoloff (jeff@allingeek.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package nsq
import (
"encoding/json"
"fmt"
"net/http"
"net/url"
"strconv"
"sync"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
// Might add Lookupd endpoints for cluster discovery
type NSQ struct {
Endpoints []string
}
var sampleConfig = `
## An array of NSQD HTTP API endpoints
endpoints = ["http://localhost:4151"]
`
const (
requestPattern = `%s/stats?format=json`
)
func init() {
inputs.Add("nsq", func() telegraf.Input {
return &NSQ{}
})
}
func (n *NSQ) SampleConfig() string {
return sampleConfig
}
func (n *NSQ) Description() string {
return "Read NSQ topic and channel statistics."
}
func (n *NSQ) Gather(acc telegraf.Accumulator) error {
var wg sync.WaitGroup
var outerr error
for _, e := range n.Endpoints {
wg.Add(1)
go func(e string) {
defer wg.Done()
outerr = n.gatherEndpoint(e, acc)
}(e)
}
wg.Wait()
return outerr
}
var tr = &http.Transport{
ResponseHeaderTimeout: time.Duration(3 * time.Second),
}
var client = &http.Client{
Transport: tr,
Timeout: time.Duration(4 * time.Second),
}
func (n *NSQ) gatherEndpoint(e string, acc telegraf.Accumulator) error {
u, err := buildURL(e)
if err != nil {
return err
}
r, err := client.Get(u.String())
if err != nil {
return fmt.Errorf("Error while polling %s: %s", u.String(), err)
}
defer r.Body.Close()
if r.StatusCode != http.StatusOK {
return fmt.Errorf("%s returned HTTP status %s", u.String(), r.Status)
}
s := &NSQStats{}
err = json.NewDecoder(r.Body).Decode(s)
if err != nil {
return fmt.Errorf(`Error parsing response: %s`, err)
}
tags := map[string]string{
`server_host`: u.Host,
`server_version`: s.Data.Version,
}
fields := make(map[string]interface{})
if s.Data.Health == `OK` {
fields["server_count"] = int64(1)
} else {
fields["server_count"] = int64(0)
}
fields["topic_count"] = int64(len(s.Data.Topics))
acc.AddFields("nsq_server", fields, tags)
for _, t := range s.Data.Topics {
topicStats(t, acc, u.Host, s.Data.Version)
}
return nil
}
func buildURL(e string) (*url.URL, error) {
u := fmt.Sprintf(requestPattern, e)
addr, err := url.Parse(u)
if err != nil {
return nil, fmt.Errorf("Unable to parse address '%s': %s", u, err)
}
return addr, nil
}
func topicStats(t TopicStats, acc telegraf.Accumulator, host, version string) {
// per topic overall (tag: name, paused, channel count)
tags := map[string]string{
"server_host": host,
"server_version": version,
"topic": t.Name,
}
fields := map[string]interface{}{
"depth": t.Depth,
"backend_depth": t.BackendDepth,
"message_count": t.MessageCount,
"channel_count": int64(len(t.Channels)),
}
acc.AddFields("nsq_topic", fields, tags)
for _, c := range t.Channels {
channelStats(c, acc, host, version, t.Name)
}
}
func channelStats(c ChannelStats, acc telegraf.Accumulator, host, version, topic string) {
tags := map[string]string{
"server_host": host,
"server_version": version,
"topic": topic,
"channel": c.Name,
}
fields := map[string]interface{}{
"depth": c.Depth,
"backend_depth": c.BackendDepth,
"inflight_count": c.InFlightCount,
"deferred_count": c.DeferredCount,
"message_count": c.MessageCount,
"requeue_count": c.RequeueCount,
"timeout_count": c.TimeoutCount,
"client_count": int64(len(c.Clients)),
}
acc.AddFields("nsq_channel", fields, tags)
for _, cl := range c.Clients {
clientStats(cl, acc, host, version, topic, c.Name)
}
}
func clientStats(c ClientStats, acc telegraf.Accumulator, host, version, topic, channel string) {
tags := map[string]string{
"server_host": host,
"server_version": version,
"topic": topic,
"channel": channel,
"client_name": c.Name,
"client_id": c.ID,
"client_hostname": c.Hostname,
"client_version": c.Version,
"client_address": c.RemoteAddress,
"client_user_agent": c.UserAgent,
"client_tls": strconv.FormatBool(c.TLS),
"client_snappy": strconv.FormatBool(c.Snappy),
"client_deflate": strconv.FormatBool(c.Deflate),
}
fields := map[string]interface{}{
"ready_count": c.ReadyCount,
"inflight_count": c.InFlightCount,
"message_count": c.MessageCount,
"finish_count": c.FinishCount,
"requeue_count": c.RequeueCount,
}
acc.AddFields("nsq_client", fields, tags)
}
type NSQStats struct {
Code int64 `json:"status_code"`
Txt string `json:"status_txt"`
Data NSQStatsData `json:"data"`
}
type NSQStatsData struct {
Version string `json:"version"`
Health string `json:"health"`
StartTime int64 `json:"start_time"`
Topics []TopicStats `json:"topics"`
}
// e2e_processing_latency is not modeled
type TopicStats struct {
Name string `json:"topic_name"`
Depth int64 `json:"depth"`
BackendDepth int64 `json:"backend_depth"`
MessageCount int64 `json:"message_count"`
Paused bool `json:"paused"`
Channels []ChannelStats `json:"channels"`
}
// e2e_processing_latency is not modeled
type ChannelStats struct {
Name string `json:"channel_name"`
Depth int64 `json:"depth"`
BackendDepth int64 `json:"backend_depth"`
InFlightCount int64 `json:"in_flight_count"`
DeferredCount int64 `json:"deferred_count"`
MessageCount int64 `json:"message_count"`
RequeueCount int64 `json:"requeue_count"`
TimeoutCount int64 `json:"timeout_count"`
Paused bool `json:"paused"`
Clients []ClientStats `json:"clients"`
}
type ClientStats struct {
Name string `json:"name"`
ID string `json:"client_id"`
Hostname string `json:"hostname"`
Version string `json:"version"`
RemoteAddress string `json:"remote_address"`
State int64 `json:"state"`
ReadyCount int64 `json:"ready_count"`
InFlightCount int64 `json:"in_flight_count"`
MessageCount int64 `json:"message_count"`
FinishCount int64 `json:"finish_count"`
RequeueCount int64 `json:"requeue_count"`
ConnectTime int64 `json:"connect_ts"`
SampleRate int64 `json:"sample_rate"`
Deflate bool `json:"deflate"`
Snappy bool `json:"snappy"`
UserAgent string `json:"user_agent"`
TLS bool `json:"tls"`
TLSCipherSuite string `json:"tls_cipher_suite"`
TLSVersion string `json:"tls_version"`
TLSNegotiatedProtocol string `json:"tls_negotiated_protocol"`
TLSNegotiatedProtocolIsMutual bool `json:"tls_negotiated_protocol_is_mutual"`
}