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package metrics
import (
"fmt"
"net/http"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
// TODO: These should not be global vars with this package
var epm *EndpointMetrics
var apm *ApplicationMetrics
var cpm *ClientMetrics
// EndpointMetrics stores metrics for registry endpoints
type EndpointMetrics struct {
requestsTotal *prometheus.CounterVec
requestsFailed *prometheus.CounterVec
}
// ApplicationMetrics stores metrics for applications
type ApplicationMetrics struct {
applicationsTotal prometheus.Gauge
imagesWatchedTotal *prometheus.GaugeVec
imagesUpdatedTotal *prometheus.CounterVec
imagesUpdatedErrorsTotal *prometheus.CounterVec
}
// ClientMetrics stores metrics for K8s and ArgoCD clients
type ClientMetrics struct {
argoCDRequestsTotal *prometheus.CounterVec
argoCDRequestsErrorsTotal *prometheus.CounterVec
kubeAPIRequestsTotal prometheus.Counter
kubeAPIRequestsErrorsTotal prometheus.Counter
}
// StartMetricsServer starts a new HTTP server for metrics on given port
func StartMetricsServer(port int) chan error {
errCh := make(chan error)
go func() {
sm := http.NewServeMux()
sm.Handle("/metrics", promhttp.Handler())
errCh <- http.ListenAndServe(fmt.Sprintf(":%d", port), sm)
}()
return errCh
}
// NewEndpointMetrics returns a new endpoint metrics object
func NewEndpointMetrics() *EndpointMetrics {
metrics := &EndpointMetrics{}
metrics.requestsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_registry_requests_total",
Help: "The total number of requests to this endpoint",
}, []string{"registry"})
metrics.requestsFailed = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_registry_requests_failed_total",
Help: "The number of failed requests to this endpoint",
}, []string{"registry"})
return metrics
}
// NewApplicationsMetrics returns a new application metrics object
func NewApplicationsMetrics() *ApplicationMetrics {
metrics := &ApplicationMetrics{}
metrics.applicationsTotal = promauto.NewGauge(prometheus.GaugeOpts{
Name: "argocd_image_updater_applications_watched_total",
Help: "The total number of applications watched by Argo CD Image Updater",
})
metrics.imagesWatchedTotal = promauto.NewGaugeVec(prometheus.GaugeOpts{
Name: "argocd_image_updater_images_watched_total",
Help: "Number of images watched by Argo CD Image Updater",
}, []string{"application"})
metrics.imagesUpdatedTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_images_updated_total",
Help: "Number of images updates by Argo CD Image Updater",
}, []string{"application"})
metrics.imagesUpdatedErrorsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_images_errors_total",
Help: "Number of errors reported by Argo CD Image Updater",
}, []string{"application"})
return metrics
}
// NewClientMetrics returns a new client metrics object
func NewClientMetrics() *ClientMetrics {
metrics := &ClientMetrics{}
metrics.argoCDRequestsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_argocd_api_requests_total",
Help: "The total number of Argo CD API requests performed by the Argo CD Image Updater",
}, []string{"argocd_server"})
metrics.argoCDRequestsErrorsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
Name: "argocd_image_updater_argocd_api_errors_total",
Help: "The total number of Argo CD API requests resulting in error",
}, []string{"argocd_server"})
metrics.kubeAPIRequestsTotal = promauto.NewCounter(prometheus.CounterOpts{
Name: "argocd_image_updater_k8s_api_requests_total",
Help: "The total number of Argo CD API requests resulting in error",
})
metrics.kubeAPIRequestsErrorsTotal = promauto.NewCounter(prometheus.CounterOpts{
Name: "argocd_image_updater_k8s_api_errors_total",
Help: "The total number of Argo CD API requests resulting in error",
})
return metrics
}
// Endpoint returns the global EndpointMetrics object
func Endpoint() *EndpointMetrics {
return epm
}
// Applications returns the global ApplicationMetrics object
func Applications() *ApplicationMetrics {
return apm
}
// Clients returns the global ClientMetrics object
func Clients() *ClientMetrics {
return cpm
}
// IncreaseRequest increases the request counter of EndpointMetrics object
func (epm *EndpointMetrics) IncreaseRequest(registryURL string, isFailed bool) {
epm.requestsTotal.WithLabelValues(registryURL).Inc()
if isFailed {
epm.requestsFailed.WithLabelValues(registryURL).Inc()
}
}
// SetNumberOfApplications sets the total number of currently watched applications
func (apm *ApplicationMetrics) SetNumberOfApplications(num int) {
apm.applicationsTotal.Set(float64(num))
}
// SetNumberOfImagesWatched sets the total number of currently watched images for given application
func (apm *ApplicationMetrics) SetNumberOfImagesWatched(application string, num int) {
apm.imagesWatchedTotal.WithLabelValues(application).Set(float64(num))
}
// IncreaseImageUpdate increases the number of image updates for given application
func (apm *ApplicationMetrics) IncreaseImageUpdate(application string, by int) {
apm.imagesUpdatedTotal.WithLabelValues(application).Add(float64(by))
}
// IncreaseUpdateErrors increases the number of errors for given application occurred during update process
func (apm *ApplicationMetrics) IncreaseUpdateErrors(application string, by int) {
apm.imagesUpdatedErrorsTotal.WithLabelValues(application).Add(float64(by))
}
// IncreaseArgoCDClientRequest increases the number of Argo CD API requests for given server
func (cpm *ClientMetrics) IncreaseArgoCDClientRequest(server string, by int) {
cpm.argoCDRequestsTotal.WithLabelValues(server).Add(float64(by))
}
// IncreaseArgoCDClientError increases the number of failed Argo CD API requests for given server
func (cpm *ClientMetrics) IncreaseArgoCDClientError(server string, by int) {
cpm.argoCDRequestsErrorsTotal.WithLabelValues(server).Add(float64(by))
}
// IncreaseK8sClientRequest increases the number of K8s API requests
func (cpm *ClientMetrics) IncreaseK8sClientRequest(by int) {
cpm.kubeAPIRequestsTotal.Add(float64(by))
}
// IncreaseK8sClientRequest increases the number of failed K8s API requests
func (cpm *ClientMetrics) IncreaseK8sClientError(by int) {
cpm.kubeAPIRequestsErrorsTotal.Add(float64(by))
}
// TODO: This is a lazy workaround, better initialize it somehwere else
func init() {
epm = NewEndpointMetrics()
apm = NewApplicationsMetrics()
cpm = NewClientMetrics()
}
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