423 lines
11 KiB
Go
423 lines
11 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package collectors
|
|
|
|
import (
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
|
|
"github.com/golang/glog"
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"k8s.io/apimachinery/pkg/util/sets"
|
|
)
|
|
|
|
type upstream struct {
|
|
Endpoint string `json:"endpoint"`
|
|
Latency float64 `json:"upstreamLatency"`
|
|
ResponseLength float64 `json:"upstreamResponseLength"`
|
|
ResponseTime float64 `json:"upstreamResponseTime"`
|
|
Status string `json:"upstreamStatus"`
|
|
}
|
|
|
|
type socketData struct {
|
|
Host string `json:"host"`
|
|
Status string `json:"status"`
|
|
|
|
ResponseLength float64 `json:"responseLength"`
|
|
|
|
Method string `json:"method"`
|
|
|
|
RequestLength float64 `json:"requestLength"`
|
|
RequestTime float64 `json:"requestTime"`
|
|
|
|
upstream
|
|
|
|
Namespace string `json:"namespace"`
|
|
Ingress string `json:"ingress"`
|
|
Service string `json:"service"`
|
|
Path string `json:"path"`
|
|
}
|
|
|
|
// SocketCollector stores prometheus metrics and ingress meta-data
|
|
type SocketCollector struct {
|
|
prometheus.Collector
|
|
|
|
requestTime *prometheus.HistogramVec
|
|
requestLength *prometheus.HistogramVec
|
|
|
|
responseTime *prometheus.HistogramVec
|
|
responseLength *prometheus.HistogramVec
|
|
|
|
upstreamLatency *prometheus.SummaryVec
|
|
|
|
bytesSent *prometheus.HistogramVec
|
|
|
|
requests *prometheus.CounterVec
|
|
|
|
listener net.Listener
|
|
|
|
metricMapping map[string]interface{}
|
|
}
|
|
|
|
var (
|
|
requestTags = []string{
|
|
"host",
|
|
|
|
"status",
|
|
|
|
"method",
|
|
"path",
|
|
|
|
// "endpoint",
|
|
|
|
"namespace",
|
|
"ingress",
|
|
"service",
|
|
}
|
|
)
|
|
|
|
// NewSocketCollector creates a new SocketCollector instance using
|
|
// the ingresss watch namespace and class used by the controller
|
|
func NewSocketCollector(pod, namespace, class string) (*SocketCollector, error) {
|
|
listener, err := net.Listen("unix", "/tmp/prometheus-nginx.socket")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
constLabels := prometheus.Labels{
|
|
"controller_namespace": namespace,
|
|
"controller_class": class,
|
|
"controller_pod": pod,
|
|
}
|
|
|
|
sc := &SocketCollector{
|
|
listener: listener,
|
|
|
|
responseTime: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "response_duration_seconds",
|
|
Help: "The time spent on receiving the response from the upstream server",
|
|
Namespace: PrometheusNamespace,
|
|
ConstLabels: constLabels,
|
|
},
|
|
requestTags,
|
|
),
|
|
responseLength: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "response_size",
|
|
Help: "The response length (including request line, header, and request body)",
|
|
Namespace: PrometheusNamespace,
|
|
ConstLabels: constLabels,
|
|
},
|
|
requestTags,
|
|
),
|
|
|
|
requestTime: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "request_duration_seconds",
|
|
Help: "The request processing time in milliseconds",
|
|
Namespace: PrometheusNamespace,
|
|
ConstLabels: constLabels,
|
|
},
|
|
requestTags,
|
|
),
|
|
requestLength: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "request_size",
|
|
Help: "The request length (including request line, header, and request body)",
|
|
Namespace: PrometheusNamespace,
|
|
Buckets: prometheus.LinearBuckets(10, 10, 10), // 10 buckets, each 10 bytes wide.
|
|
ConstLabels: constLabels,
|
|
},
|
|
requestTags,
|
|
),
|
|
|
|
requests: prometheus.NewCounterVec(
|
|
prometheus.CounterOpts{
|
|
Name: "requests",
|
|
Help: "The total number of client requests.",
|
|
Namespace: PrometheusNamespace,
|
|
ConstLabels: constLabels,
|
|
},
|
|
[]string{"ingress", "namespace", "status"},
|
|
),
|
|
|
|
bytesSent: prometheus.NewHistogramVec(
|
|
prometheus.HistogramOpts{
|
|
Name: "bytes_sent",
|
|
Help: "The the number of bytes sent to a client",
|
|
Namespace: PrometheusNamespace,
|
|
Buckets: prometheus.ExponentialBuckets(10, 10, 7), // 7 buckets, exponential factor of 10.
|
|
ConstLabels: constLabels,
|
|
},
|
|
requestTags,
|
|
),
|
|
|
|
upstreamLatency: prometheus.NewSummaryVec(
|
|
prometheus.SummaryOpts{
|
|
Name: "ingress_upstream_latency_seconds",
|
|
Help: "Upstream service latency per Ingress",
|
|
Namespace: PrometheusNamespace,
|
|
ConstLabels: constLabels,
|
|
},
|
|
[]string{"ingress", "namespace", "service"},
|
|
),
|
|
}
|
|
|
|
sc.metricMapping = map[string]interface{}{
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "request_duration_seconds"): sc.requestTime,
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "request_size"): sc.requestLength,
|
|
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "response_duration_seconds"): sc.responseTime,
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "response_size"): sc.responseLength,
|
|
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "bytes_sent"): sc.bytesSent,
|
|
|
|
prometheus.BuildFQName(PrometheusNamespace, "", "ingress_upstream_latency_seconds"): sc.upstreamLatency,
|
|
}
|
|
|
|
return sc, nil
|
|
}
|
|
|
|
func (sc *SocketCollector) handleMessage(msg []byte) {
|
|
glog.V(5).Infof("msg: %v", string(msg))
|
|
|
|
// Unmarshall bytes
|
|
var stats socketData
|
|
err := json.Unmarshal(msg, &stats)
|
|
if err != nil {
|
|
glog.Errorf("Unexpected error deserializing JSON paylod: %v", err)
|
|
return
|
|
}
|
|
|
|
requestLabels := prometheus.Labels{
|
|
"host": stats.Host,
|
|
"status": stats.Status,
|
|
"method": stats.Method,
|
|
"path": stats.Path,
|
|
//"endpoint": stats.Endpoint,
|
|
"namespace": stats.Namespace,
|
|
"ingress": stats.Ingress,
|
|
"service": stats.Service,
|
|
}
|
|
|
|
collectorLabels := prometheus.Labels{
|
|
"namespace": stats.Namespace,
|
|
"ingress": stats.Ingress,
|
|
"status": stats.Status,
|
|
}
|
|
|
|
latencyLabels := prometheus.Labels{
|
|
"namespace": stats.Namespace,
|
|
"ingress": stats.Ingress,
|
|
"service": stats.Service,
|
|
}
|
|
|
|
requestsMetric, err := sc.requests.GetMetricWith(collectorLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching requests metric: %v", err)
|
|
} else {
|
|
requestsMetric.Inc()
|
|
}
|
|
|
|
if stats.Latency != -1 {
|
|
latencyMetric, err := sc.upstreamLatency.GetMetricWith(latencyLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching latency metric: %v", err)
|
|
} else {
|
|
latencyMetric.Observe(stats.Latency)
|
|
}
|
|
}
|
|
|
|
if stats.RequestTime != -1 {
|
|
requestTimeMetric, err := sc.requestTime.GetMetricWith(requestLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching request duration metric: %v", err)
|
|
} else {
|
|
requestTimeMetric.Observe(stats.RequestTime)
|
|
}
|
|
}
|
|
|
|
if stats.RequestLength != -1 {
|
|
requestLengthMetric, err := sc.requestLength.GetMetricWith(requestLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching request length metric: %v", err)
|
|
} else {
|
|
requestLengthMetric.Observe(stats.RequestLength)
|
|
}
|
|
}
|
|
|
|
if stats.ResponseTime != -1 {
|
|
responseTimeMetric, err := sc.responseTime.GetMetricWith(requestLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching upstream response time metric: %v", err)
|
|
} else {
|
|
responseTimeMetric.Observe(stats.ResponseTime)
|
|
}
|
|
}
|
|
|
|
if stats.ResponseLength != -1 {
|
|
bytesSentMetric, err := sc.bytesSent.GetMetricWith(requestLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching bytes sent metric: %v", err)
|
|
} else {
|
|
bytesSentMetric.Observe(stats.ResponseLength)
|
|
}
|
|
|
|
responseSizeMetric, err := sc.responseLength.GetMetricWith(requestLabels)
|
|
if err != nil {
|
|
glog.Errorf("Error fetching bytes sent metric: %v", err)
|
|
} else {
|
|
responseSizeMetric.Observe(stats.ResponseLength)
|
|
}
|
|
}
|
|
}
|
|
|
|
// Start listen for connections in the unix socket and spawns a goroutine to process the content
|
|
func (sc *SocketCollector) Start() {
|
|
for {
|
|
conn, err := sc.listener.Accept()
|
|
if err != nil {
|
|
continue
|
|
}
|
|
|
|
go handleMessages(conn, sc.handleMessage)
|
|
}
|
|
}
|
|
|
|
// Stop stops unix listener
|
|
func (sc *SocketCollector) Stop() {
|
|
sc.listener.Close()
|
|
}
|
|
|
|
// RemoveMetrics deletes prometheus metrics from prometheus for ingresses and
|
|
// host that are not available anymore.
|
|
// Ref: https://godoc.org/github.com/prometheus/client_golang/prometheus#CounterVec.Delete
|
|
func (sc *SocketCollector) RemoveMetrics(ingresses []string, registry prometheus.Gatherer) {
|
|
mfs, err := registry.Gather()
|
|
if err != nil {
|
|
glog.Errorf("Error gathering metrics: %v", err)
|
|
return
|
|
}
|
|
|
|
// 1. remove metrics of removed ingresses
|
|
glog.V(2).Infof("removing ingresses %v from metrics", ingresses)
|
|
for _, mf := range mfs {
|
|
metricName := mf.GetName()
|
|
metric, ok := sc.metricMapping[metricName]
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
toRemove := sets.NewString(ingresses...)
|
|
for _, m := range mf.GetMetric() {
|
|
labels := make(map[string]string, len(m.GetLabel()))
|
|
for _, labelPair := range m.GetLabel() {
|
|
labels[*labelPair.Name] = *labelPair.Value
|
|
}
|
|
|
|
// remove labels that are constant
|
|
deleteConstants(labels)
|
|
|
|
ns, ok := labels["namespace"]
|
|
if !ok {
|
|
continue
|
|
}
|
|
ing, ok := labels["ingress"]
|
|
if !ok {
|
|
continue
|
|
}
|
|
|
|
ingKey := fmt.Sprintf("%v/%v", ns, ing)
|
|
if !toRemove.Has(ingKey) {
|
|
continue
|
|
}
|
|
|
|
glog.V(2).Infof("Removing prometheus metric from histogram %v for ingress %v", metricName, ingKey)
|
|
|
|
h, ok := metric.(*prometheus.HistogramVec)
|
|
if ok {
|
|
removed := h.Delete(labels)
|
|
if !removed {
|
|
glog.V(2).Infof("metric %v for ingress %v with labels not removed: %v", metricName, ingKey, labels)
|
|
}
|
|
}
|
|
|
|
s, ok := metric.(*prometheus.SummaryVec)
|
|
if ok {
|
|
removed := s.Delete(labels)
|
|
if !removed {
|
|
glog.V(2).Infof("metric %v for ingress %v with labels not removed: %v", metricName, ingKey, labels)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// Describe implements prometheus.Collector
|
|
func (sc SocketCollector) Describe(ch chan<- *prometheus.Desc) {
|
|
sc.requestTime.Describe(ch)
|
|
sc.requestLength.Describe(ch)
|
|
|
|
sc.requests.Describe(ch)
|
|
|
|
sc.upstreamLatency.Describe(ch)
|
|
|
|
sc.responseTime.Describe(ch)
|
|
sc.responseLength.Describe(ch)
|
|
|
|
sc.bytesSent.Describe(ch)
|
|
}
|
|
|
|
// Collect implements the prometheus.Collector interface.
|
|
func (sc SocketCollector) Collect(ch chan<- prometheus.Metric) {
|
|
sc.requestTime.Collect(ch)
|
|
sc.requestLength.Collect(ch)
|
|
|
|
sc.requests.Collect(ch)
|
|
|
|
sc.upstreamLatency.Collect(ch)
|
|
|
|
sc.responseTime.Collect(ch)
|
|
sc.responseLength.Collect(ch)
|
|
|
|
sc.bytesSent.Collect(ch)
|
|
}
|
|
|
|
const packetSize = 1024 * 65
|
|
|
|
// handleMessages process the content received in a network connection
|
|
func handleMessages(conn io.ReadCloser, fn func([]byte)) {
|
|
defer conn.Close()
|
|
|
|
msg := make([]byte, packetSize)
|
|
s, err := conn.Read(msg[0:])
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
fn(msg[0:s])
|
|
}
|
|
|
|
func deleteConstants(labels prometheus.Labels) {
|
|
delete(labels, "controller_namespace")
|
|
delete(labels, "controller_class")
|
|
delete(labels, "controller_pod")
|
|
}
|