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client.go
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client.go
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package prometheus
import (
"context"
"fmt"
"net/http"
"time"
"github.com/prometheus/client_golang/api"
prom_v1 "github.com/prometheus/client_golang/api/prometheus/v1"
"github.com/prometheus/common/model"
"github.com/kiali/kiali/config"
"github.com/kiali/kiali/kubernetes"
"github.com/kiali/kiali/log"
"github.com/kiali/kiali/util/httputil"
)
// ClientInterface for mocks (only mocked function are necessary here)
type ClientInterface interface {
FetchHistogramRange(metricName, labels, grouping string, q *BaseMetricsQuery) Histogram
FetchRange(metricName, labels, grouping, aggregator string, q *BaseMetricsQuery) *Metric
FetchRateRange(metricName, labels, grouping string, q *BaseMetricsQuery) *Metric
GetAllRequestRates(namespace, ratesInterval string, queryTime time.Time) (model.Vector, error)
GetAppRequestRates(namespace, app, ratesInterval string, queryTime time.Time) (model.Vector, model.Vector, error)
GetConfiguration() (prom_v1.ConfigResult, error)
GetFlags() (prom_v1.FlagsResult, error)
GetMetrics(query *IstioMetricsQuery) Metrics
GetNamespaceServicesRequestRates(namespace, ratesInterval string, queryTime time.Time) (model.Vector, error)
GetServiceRequestRates(namespace, service, ratesInterval string, queryTime time.Time) (model.Vector, error)
GetWorkloadRequestRates(namespace, workload, ratesInterval string, queryTime time.Time) (model.Vector, model.Vector, error)
}
// Client for Prometheus API.
// It hides the way we query Prometheus offering a layer with a high level defined API.
type Client struct {
ClientInterface
p8s api.Client
api prom_v1.API
}
// NewClient creates a new client to the Prometheus API.
// It returns an error on any problem.
func NewClient() (*Client, error) {
cfg := config.Get().ExternalServices.Prometheus
clientConfig := api.Config{Address: cfg.URL}
// Be sure to copy config.Auth and not modify the existing
auth := cfg.Auth
if auth.UseKialiToken {
// Note: if we are using the 'bearer' authentication method then we want to use the Kiali
// service account token and not the user's token. This is because Kiali does filtering based
// on the user's token and prevents people who shouldn't have access to particular metrics.
token, err := kubernetes.GetKialiToken()
if err != nil {
log.Errorf("Could not read the Kiali Service Account token: %v", err)
return nil, err
}
auth.Token = token
}
transportConfig, err := httputil.AuthTransport(&auth, api.DefaultRoundTripper.(*http.Transport))
if err != nil {
return nil, err
}
clientConfig.RoundTripper = transportConfig
p8s, err := api.NewClient(clientConfig)
if err != nil {
return nil, err
}
client := Client{p8s: p8s, api: prom_v1.NewAPI(p8s)}
return &client, nil
}
// Inject allows for replacing the API with a mock For testing
func (in *Client) Inject(api prom_v1.API) {
in.api = api
}
// GetMetrics returns the Metrics related to the provided query options.
func (in *Client) GetMetrics(query *IstioMetricsQuery) Metrics {
return getMetrics(in.api, query)
}
// GetAllRequestRates queries Prometheus to fetch request counter rates, over a time interval, for requests
// into, internal to, or out of the namespace.
// Returns (rates, error)
func (in *Client) GetAllRequestRates(namespace string, ratesInterval string, queryTime time.Time) (model.Vector, error) {
return getAllRequestRates(in.api, namespace, queryTime, ratesInterval)
}
// GetNamespaceServicesRequestRates queries Prometheus to fetch request counter rates, over a time interval, limited to
// requests for services in the namespace.
// Returns (rates, error)
func (in *Client) GetNamespaceServicesRequestRates(namespace string, ratesInterval string, queryTime time.Time) (model.Vector, error) {
return getNamespaceServicesRequestRates(in.api, namespace, queryTime, ratesInterval)
}
// GetServiceRequestRates queries Prometheus to fetch request counters rates over a time interval
// for a given service (hence only inbound).
// Returns (in, error)
func (in *Client) GetServiceRequestRates(namespace, service, ratesInterval string, queryTime time.Time) (model.Vector, error) {
return getServiceRequestRates(in.api, namespace, service, queryTime, ratesInterval)
}
// GetAppRequestRates queries Prometheus to fetch request counters rates over a time interval
// for a given app, both in and out.
// Returns (in, out, error)
func (in *Client) GetAppRequestRates(namespace, app, ratesInterval string, queryTime time.Time) (model.Vector, model.Vector, error) {
return getItemRequestRates(in.api, namespace, app, "app", queryTime, ratesInterval)
}
// GetWorkloadRequestRates queries Prometheus to fetch request counters rates over a time interval
// for a given workload, both in and out.
// Returns (in, out, error)
func (in *Client) GetWorkloadRequestRates(namespace, workload, ratesInterval string, queryTime time.Time) (model.Vector, model.Vector, error) {
return getItemRequestRates(in.api, namespace, workload, "workload", queryTime, ratesInterval)
}
// FetchRange fetches a simple metric (gauge or counter) in given range
func (in *Client) FetchRange(metricName, labels, grouping, aggregator string, q *BaseMetricsQuery) *Metric {
query := fmt.Sprintf("%s(%s%s)", aggregator, metricName, labels)
if grouping != "" {
query += fmt.Sprintf(" by (%s)", grouping)
}
query = roundSignificant(query, 0.001)
return fetchRange(in.api, query, q.Range)
}
// FetchRateRange fetches a counter's rate in given range
func (in *Client) FetchRateRange(metricName, labels, grouping string, q *BaseMetricsQuery) *Metric {
return fetchRateRange(in.api, metricName, []string{labels}, grouping, q)
}
// FetchHistogramRange fetches bucketed metric as histogram in given range
func (in *Client) FetchHistogramRange(metricName, labels, grouping string, q *BaseMetricsQuery) Histogram {
return fetchHistogramRange(in.api, metricName, labels, grouping, q)
}
// API returns the Prometheus V1 HTTP API for performing calls not supported natively by this client
func (in *Client) API() prom_v1.API {
return in.api
}
// Address return the configured Prometheus service URL
func (in *Client) Address() string {
return config.Get().ExternalServices.Prometheus.URL
}
func (in *Client) GetConfiguration() (prom_v1.ConfigResult, error) {
config, err := in.API().Config(context.Background())
if err != nil {
return prom_v1.ConfigResult{}, err
}
return config, nil
}
func (in *Client) GetFlags() (prom_v1.FlagsResult, error) {
flags, err := in.API().Flags(context.Background())
if err != nil {
return nil, err
}
return flags, nil
}