/
main.go
217 lines (186 loc) · 6.36 KB
/
main.go
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package main
import (
"encoding/json"
"github.com/caitlinelfring/go-env-default"
"github.com/daloman/nginx_unit_exporter/connector"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
"io"
"net/http"
)
type UnitStats struct {
Connections *ConnectionsState `json:"connections,omitempty"`
Requests *InstanceRequests `json:"requests,omitempty"`
Applications map[string]*AppName `json:"applications,omitempty"`
}
type ConnectionsState struct {
Accepted int `json:"accepted,omitempty"`
Active int `json:"active,omitempty"`
Idle int `json:"idle,omitempty"`
Closed int `json:"closed,omitempty"`
}
type InstanceRequests struct {
Total int `json:"total,omitempty"`
}
type AppName struct {
Processes map[string]int `json:"processes,omitempty"`
Requests *AppRequests `json:"requests,omitempty"`
}
type AppRequests struct {
Active int `json:"active,omitempty"`
}
// Descriptors used by the UnitCollector below.
var (
unitInstanceRequestsTotalDesc = prometheus.NewDesc(
"unit_instance_requests_total",
"Total non-API requests during the instance’s lifetime.",
[]string{"instance", "application"}, nil,
)
unitInstanceConnectionsAcceptedDesc = prometheus.NewDesc(
"unit_instance_connections_accepted_total",
"Total accepted connections during the instance’s lifetime.",
[]string{"instance", "application"}, nil,
)
unitInstanceConnectionsActiveDesc = prometheus.NewDesc(
"unit_instance_connections_active",
"Current active connections for the instance",
[]string{"instance", "application"}, nil,
)
unitInstanceConnectionsIdleDesc = prometheus.NewDesc(
"unit_instance_connections_idle",
"Current idle connections for the instance",
[]string{"instance", "application"}, nil,
)
unitInstanceConnectionsClosedDesc = prometheus.NewDesc(
"unit_instance_connections_closed_total",
"Total closed connections during the instance’s lifetime",
[]string{"instance", "application"}, nil,
)
unitApplicationRequestsActiveDesc = prometheus.NewDesc(
"unit_application_requests_active",
"Similar to /status/requests, but includes only the data for a specific app.",
[]string{"instance", "application"}, nil,
)
unitApplicationProcessesDesc = prometheus.NewDesc(
"unit_application_processes",
"Current app processes.",
[]string{"instance", "application", "state"}, nil,
)
)
// UnitStatsCollector implements the Collector interface.
type UnitStatsCollector struct {
UnitStats *UnitStats
}
func (sc UnitStatsCollector) Describe(ch chan<- *prometheus.Desc) {
prometheus.DescribeByCollect(sc, ch)
}
func (sc UnitStatsCollector) Collect(ch chan<- prometheus.Metric) {
resUnitMetrics, _ := sc.UnitStats.collectMetrics()
unitInstanceRequestsTotal := resUnitMetrics.Requests.Total
ch <- prometheus.MustNewConstMetric(
unitInstanceRequestsTotalDesc,
prometheus.CounterValue,
float64(unitInstanceRequestsTotal),
"unit", "",
)
unitInstanceConnectionsAccepted := resUnitMetrics.Connections.Accepted
ch <- prometheus.MustNewConstMetric(
unitInstanceConnectionsAcceptedDesc,
prometheus.CounterValue,
float64(unitInstanceConnectionsAccepted),
"unit", "",
)
unitInstanceConnectionsActive := resUnitMetrics.Connections.Active
ch <- prometheus.MustNewConstMetric(
unitInstanceConnectionsActiveDesc,
prometheus.GaugeValue,
float64(unitInstanceConnectionsActive),
"unit", "",
)
unitInstanceConnectionsIdle := resUnitMetrics.Connections.Idle
ch <- prometheus.MustNewConstMetric(
unitInstanceConnectionsIdleDesc,
prometheus.GaugeValue,
float64(unitInstanceConnectionsIdle),
"unit", "",
)
unitInstanceConnectionsClosed := resUnitMetrics.Connections.Closed
ch <- prometheus.MustNewConstMetric(
unitInstanceConnectionsClosedDesc,
prometheus.CounterValue,
float64(unitInstanceConnectionsClosed),
"unit", "",
)
unitApplicationRequestsActive := resUnitMetrics.Applications
for application := range unitApplicationRequestsActive {
ch <- prometheus.MustNewConstMetric(
unitApplicationRequestsActiveDesc,
prometheus.GaugeValue,
float64(unitApplicationRequestsActive[application].Requests.Active),
"unit", application,
)
}
unitApplicationProcesses := resUnitMetrics.Applications
for application := range unitApplicationProcesses {
for state := range unitApplicationProcesses[application].Processes {
ch <- prometheus.MustNewConstMetric(
unitApplicationProcessesDesc,
prometheus.GaugeValue,
float64(unitApplicationProcesses[application].Processes[state]),
"unit", application, state,
)
}
}
}
// NewUnitStats first creates a Prometheus-ignorant UnitStats
// instance. Then, it creates a UnitStatsCollector for the just created
// UnitStats. Finally, it registers the UnitStatsCollector with a
// wrapping Registerer.
func NewUnitStats(reg prometheus.Registerer) *UnitStats {
c := &UnitStats{}
sc := UnitStatsCollector{UnitStats: c}
prometheus.WrapRegistererWith(nil, reg).MustRegister(sc)
return c
}
func main() {
//#############################
// Since we are dealing with custom Collector implementations, it might
// be a good idea to try it out with a pedantic registry.
reg := prometheus.NewPedanticRegistry()
NewUnitStats(reg)
// Add the standard process and Go metrics to the custom registry.
reg.MustRegister(
prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
// prometheus.NewGoCollector(),
)
http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
var metricsAddress = env.GetDefault("METRICS_LISTEN_ADDRESS", ":9095")
log.Fatal(http.ListenAndServe(metricsAddress, nil))
}
func (stats *UnitStats) collectMetrics() (metrics *UnitStats, err error) {
//############################
// Here should be configured with flags or env
// var network = "unix"
// var address = "/tmp/unit-sock/control.unit.sock"
var network = env.GetDefault("UNITD_CONTROL_NETWORK", "tcp")
var address = env.GetDefault("UNITD_CONTROL_ADDRESS", ":8081")
c := connector.NewConnection(network, address)
res, err := c.Get("http://" + network + "/status")
if err != nil {
return metrics, err
}
body, err := io.ReadAll(res.Body)
res.Body.Close()
if res.StatusCode > 299 {
log.Warnf("Response failed with status code: %d and\nbody: %s\n", res.StatusCode, body)
}
if err != nil {
return metrics, err
}
err = json.Unmarshal(body, &metrics)
if err != nil {
return metrics, err
}
return metrics, nil
}