telegraf/plugins/inputs/rabbitmq/rabbitmq.go

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package rabbitmq
import (
"encoding/json"
"fmt"
"net/http"
"strconv"
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"time"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
const DefaultUsername = "guest"
const DefaultPassword = "guest"
const DefaultURL = "http://localhost:15672"
type RabbitMQ struct {
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URL string
Name string
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Username string
Password string
Nodes []string
Queues []string
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Client *http.Client
}
type OverviewResponse struct {
MessageStats *MessageStats `json:"message_stats"`
ObjectTotals *ObjectTotals `json:"object_totals"`
QueueTotals *QueueTotals `json:"queue_totals"`
}
type Details struct {
Rate float64
}
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type MessageStats struct {
Ack int64
AckDetails Details `json:"ack_details"`
Deliver int64
DeliverDetails Details `json:"deliver_details"`
DeliverGet int64
DeliverGetDetails Details `json:"deliver_get_details"`
Publish int64
PublishDetails Details `json:"publish_details"`
Redeliver int64
RedeliverDetails Details `json:"redeliver_details"`
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}
type ObjectTotals struct {
Channels int64
Connections int64
Consumers int64
Exchanges int64
Queues int64
}
type QueueTotals struct {
Messages int64
MessagesReady int64 `json:"messages_ready"`
MessagesUnacknowledged int64 `json:"messages_unacknowledged"`
}
type Queue struct {
QueueTotals // just to not repeat the same code
MessageStats `json:"message_stats"`
Memory int64
Consumers int64
ConsumerUtilisation float64 `json:"consumer_utilisation"`
Name string
Node string
Vhost string
Durable bool
AutoDelete bool `json:"auto_delete"`
}
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type Node struct {
Name string
DiskFree int64 `json:"disk_free"`
DiskFreeLimit int64 `json:"disk_free_limit"`
FdTotal int64 `json:"fd_total"`
FdUsed int64 `json:"fd_used"`
MemLimit int64 `json:"mem_limit"`
MemUsed int64 `json:"mem_used"`
ProcTotal int64 `json:"proc_total"`
ProcUsed int64 `json:"proc_used"`
RunQueue int64 `json:"run_queue"`
SocketsTotal int64 `json:"sockets_total"`
SocketsUsed int64 `json:"sockets_used"`
}
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type gatherFunc func(r *RabbitMQ, acc inputs.Accumulator, errChan chan error)
var gatherFunctions = []gatherFunc{gatherOverview, gatherNodes, gatherQueues}
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var sampleConfig = `
url = "http://localhost:15672" # required
# name = "rmq-server-1" # optional tag
# username = "guest"
# password = "guest"
# A list of nodes to pull metrics about. If not specified, metrics for
# all nodes are gathered.
# nodes = ["rabbit@node1", "rabbit@node2"]
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`
func (r *RabbitMQ) SampleConfig() string {
return sampleConfig
}
func (r *RabbitMQ) Description() string {
return "Read metrics from one or many RabbitMQ servers via the management API"
}
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func (r *RabbitMQ) Gather(acc inputs.Accumulator) error {
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if r.Client == nil {
r.Client = &http.Client{}
}
var errChan = make(chan error, len(gatherFunctions))
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for _, f := range gatherFunctions {
go f(r, acc, errChan)
}
for i := 1; i <= len(gatherFunctions); i++ {
err := <-errChan
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if err != nil {
return err
}
}
return nil
}
func (r *RabbitMQ) requestJSON(u string, target interface{}) error {
u = fmt.Sprintf("%s%s", r.URL, u)
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return err
}
username := r.Username
if username == "" {
username = DefaultUsername
}
password := r.Password
if password == "" {
password = DefaultPassword
}
req.SetBasicAuth(username, password)
resp, err := r.Client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
json.NewDecoder(resp.Body).Decode(target)
return nil
}
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func gatherOverview(r *RabbitMQ, acc inputs.Accumulator, errChan chan error) {
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overview := &OverviewResponse{}
err := r.requestJSON("/api/overview", &overview)
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if err != nil {
errChan <- err
return
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}
if overview.QueueTotals == nil || overview.ObjectTotals == nil || overview.MessageStats == nil {
errChan <- fmt.Errorf("Wrong answer from rabbitmq. Probably auth issue")
return
}
tags := map[string]string{"url": r.URL}
if r.Name != "" {
tags["name"] = r.Name
}
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fields := map[string]interface{}{
"messages": overview.QueueTotals.Messages,
"messages_ready": overview.QueueTotals.MessagesReady,
"messages_unacked": overview.QueueTotals.MessagesUnacknowledged,
"channels": overview.ObjectTotals.Channels,
"connections": overview.ObjectTotals.Connections,
"consumers": overview.ObjectTotals.Consumers,
"exchanges": overview.ObjectTotals.Exchanges,
"queues": overview.ObjectTotals.Queues,
"messages_acked": overview.MessageStats.Ack,
"messages_delivered": overview.MessageStats.Deliver,
"messages_published": overview.MessageStats.Publish,
}
acc.AddFields("rabbitmq_overview", fields, tags)
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errChan <- nil
}
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func gatherNodes(r *RabbitMQ, acc inputs.Accumulator, errChan chan error) {
nodes := make([]Node, 0)
// Gather information about nodes
err := r.requestJSON("/api/nodes", &nodes)
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if err != nil {
errChan <- err
return
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}
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now := time.Now()
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for _, node := range nodes {
if !r.shouldGatherNode(node) {
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continue
}
tags := map[string]string{"url": r.URL}
tags["node"] = node.Name
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fields := map[string]interface{}{
"disk_free": node.DiskFree,
"disk_free_limit": node.DiskFreeLimit,
"fd_total": node.FdTotal,
"fd_used": node.FdUsed,
"mem_limit": node.MemLimit,
"mem_used": node.MemUsed,
"proc_total": node.ProcTotal,
"proc_used": node.ProcUsed,
"run_queue": node.RunQueue,
"sockets_total": node.SocketsTotal,
"sockets_used": node.SocketsUsed,
}
acc.AddFields("rabbitmq_node", fields, tags, now)
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}
errChan <- nil
}
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func gatherQueues(r *RabbitMQ, acc inputs.Accumulator, errChan chan error) {
// Gather information about queues
queues := make([]Queue, 0)
err := r.requestJSON("/api/queues", &queues)
if err != nil {
errChan <- err
return
}
for _, queue := range queues {
if !r.shouldGatherQueue(queue) {
continue
}
tags := map[string]string{
"url": r.URL,
"queue": queue.Name,
"vhost": queue.Vhost,
"node": queue.Node,
"durable": strconv.FormatBool(queue.Durable),
"auto_delete": strconv.FormatBool(queue.AutoDelete),
}
acc.AddFields(
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"rabbitmq_queue",
map[string]interface{}{
// common information
"consumers": queue.Consumers,
"consumer_utilisation": queue.ConsumerUtilisation,
"memory": queue.Memory,
// messages information
"messages": queue.Messages,
"messages_ready": queue.MessagesReady,
"messages_unack": queue.MessagesUnacknowledged,
"messages_ack": queue.MessageStats.Ack,
"messages_ack_rate": queue.MessageStats.AckDetails.Rate,
"messages_deliver": queue.MessageStats.Deliver,
"messages_deliver_rate": queue.MessageStats.DeliverDetails.Rate,
"messages_deliver_get": queue.MessageStats.DeliverGet,
"messages_deliver_get_rate": queue.MessageStats.DeliverGetDetails.Rate,
"messages_publish": queue.MessageStats.Publish,
"messages_publish_rate": queue.MessageStats.PublishDetails.Rate,
"messages_redeliver": queue.MessageStats.Redeliver,
"messages_redeliver_rate": queue.MessageStats.RedeliverDetails.Rate,
},
tags,
)
}
errChan <- nil
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}
func (r *RabbitMQ) shouldGatherNode(node Node) bool {
if len(r.Nodes) == 0 {
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return true
}
for _, name := range r.Nodes {
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if name == node.Name {
return true
}
}
return false
}
func (r *RabbitMQ) shouldGatherQueue(queue Queue) bool {
if len(r.Queues) == 0 {
return true
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}
for _, name := range r.Queues {
if name == queue.Name {
return true
}
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}
return false
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}
func init() {
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inputs.Add("rabbitmq", func() inputs.Input {
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return &RabbitMQ{}
})
}