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grafana.go
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grafana.go
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package business
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strings"
"time"
"k8s.io/client-go/tools/clientcmd/api"
"github.com/kiali/kiali/config"
"github.com/kiali/kiali/config/dashboards"
"github.com/kiali/kiali/log"
"github.com/kiali/kiali/models"
"github.com/kiali/kiali/status"
"github.com/kiali/kiali/util/httputil"
)
type dashboardSupplier func(string, string, *config.Auth) ([]byte, int, error)
var GrafanaDashboardSupplier = findDashboard
// GetGrafanaInfo returns the Grafana URL and other info, the HTTP status code (int) and eventually an error
func GetGrafanaInfo(authInfo *api.AuthInfo, dashboardSupplier dashboardSupplier) (*models.GrafanaInfo, int, error) {
grafanaConfig := config.Get().ExternalServices.Grafana
if !grafanaConfig.Enabled {
return nil, http.StatusNoContent, nil
}
conn, code, err := getGrafanaConnectionInfo(authInfo, &grafanaConfig)
if err != nil {
return nil, code, err
}
// Call Grafana REST API to get dashboard urls
links := []models.ExternalLink{}
for _, dashboardConfig := range grafanaConfig.Dashboards {
dashboardPath, err := getDashboardPath(dashboardConfig.Name, conn, dashboardSupplier)
if err != nil {
return nil, http.StatusServiceUnavailable, err
}
if dashboardPath != "" {
externalLink := models.ExternalLink{
URL: dashboardPath,
Name: dashboardConfig.Name,
Variables: dashboards.MonitoringDashboardExternalLinkVariables{
App: dashboardConfig.Variables.App,
Namespace: dashboardConfig.Variables.Namespace,
Service: dashboardConfig.Variables.Service,
Version: dashboardConfig.Variables.Version,
Workload: dashboardConfig.Variables.Workload,
},
}
links = append(links, externalLink)
}
}
grafanaInfo := models.GrafanaInfo{
ExternalLinks: links,
}
return &grafanaInfo, http.StatusOK, nil
}
// GetGrafanaLinks returns the links to Grafana dashboards and other info, the HTTP status code (int) and eventually an error
func GetGrafanaLinks(authInfo *api.AuthInfo, linksSpec []dashboards.MonitoringDashboardExternalLink) ([]models.ExternalLink, int, error) {
grafanaConfig := config.Get().ExternalServices.Grafana
if !grafanaConfig.Enabled {
return nil, 0, nil
}
connectionInfo, code, err := getGrafanaConnectionInfo(authInfo, &grafanaConfig)
if err != nil {
return nil, code, err
}
if connectionInfo.baseExternalURL == "" {
log.Tracef("Skip checking Grafana links as Grafana is not configured")
return nil, 0, nil
}
return getGrafanaLinks(connectionInfo, linksSpec, GrafanaDashboardSupplier)
}
func getGrafanaLinks(conn grafanaConnectionInfo, linksSpec []dashboards.MonitoringDashboardExternalLink, dashboardSupplier dashboardSupplier) ([]models.ExternalLink, int, error) {
// Call Grafana REST API to get dashboard urls
linksOut := []models.ExternalLink{}
for _, linkSpec := range linksSpec {
if linkSpec.Type == "grafana" {
dashboardPath, err := getDashboardPath(linkSpec.Name, conn, dashboardSupplier)
if err != nil {
return nil, http.StatusServiceUnavailable, err
}
if dashboardPath != "" {
linkOut := models.ExternalLink{
URL: dashboardPath,
Name: linkSpec.Name,
Variables: linkSpec.Variables,
}
linksOut = append(linksOut, linkOut)
}
}
}
return linksOut, http.StatusOK, nil
}
type grafanaConnectionInfo struct {
baseExternalURL string
externalURLParams string
inClusterURL string
auth *config.Auth
}
func getGrafanaConnectionInfo(authInfo *api.AuthInfo, cfg *config.GrafanaConfig) (grafanaConnectionInfo, int, error) {
externalURL := status.DiscoverGrafana()
if externalURL == "" {
return grafanaConnectionInfo{}, http.StatusServiceUnavailable, errors.New("grafana URL is not set in Kiali configuration")
}
// Check if URL is valid
_, err := url.ParseRequestURI(externalURL)
if err != nil {
return grafanaConnectionInfo{}, http.StatusServiceUnavailable, errors.New("wrong format for Grafana URL: " + err.Error())
}
apiURL := externalURL
// Find the in-cluster URL to reach Grafana's REST API if properties demand so
if cfg.InClusterURL != "" {
apiURL = cfg.InClusterURL
}
urlParts := strings.Split(externalURL, "?")
externalURLParams := ""
// E.g.: http://localhost:3000?orgId=1 transformed into http://localhost:3000/d/LJ_uJAvmk/istio-service-dashboard?orgId=1
externalURL = urlParts[0]
if len(urlParts) > 1 {
externalURLParams = "?" + urlParts[1]
}
return grafanaConnectionInfo{
baseExternalURL: externalURL,
externalURLParams: externalURLParams,
inClusterURL: apiURL,
auth: &cfg.Auth,
}, 0, nil
}
func getDashboardPath(name string, conn grafanaConnectionInfo, dashboardSupplier dashboardSupplier) (string, error) {
body, code, err := dashboardSupplier(conn.inClusterURL, url.PathEscape(name), conn.auth)
if err != nil {
return "", err
}
if code != http.StatusOK {
// Get error message
var f map[string]string
err = json.Unmarshal(body, &f)
if err != nil {
return "", fmt.Errorf("unknown error from Grafana (%d)", code)
}
message, ok := f["message"]
if !ok {
return "", fmt.Errorf("unknown error from Grafana (%d)", code)
}
return "", fmt.Errorf("error from Grafana (%d): %s", code, message)
}
// Status OK, read dashboards info
var dashboards []map[string]interface{}
err = json.Unmarshal(body, &dashboards)
if err != nil {
return "", err
}
if len(dashboards) == 0 {
log.Warningf("No Grafana dashboard found for pattern '%s'", name)
return "", nil
}
if len(dashboards) > 1 {
log.Infof("Several Grafana dashboards found for pattern '%s', picking the first one", name)
}
dashPath, ok := dashboards[0]["url"]
if !ok {
log.Warningf("URL field not found in Grafana dashboard for search pattern '%s'", name)
return "", nil
}
fullPath := dashPath.(string)
if fullPath != "" {
// Dashboard path might be an absolute URL (hence starting with cfg.URL) or a relative one, depending on grafana's "GF_SERVER_SERVE_FROM_SUB_PATH"
if !strings.HasPrefix(fullPath, conn.baseExternalURL) {
fullPath = strings.TrimSuffix(conn.baseExternalURL, "/") + "/" + strings.TrimPrefix(fullPath, "/")
}
}
return fullPath + conn.externalURLParams, nil
}
func findDashboard(url, searchPattern string, auth *config.Auth) ([]byte, int, error) {
urlParts := strings.Split(url, "?")
query := strings.TrimSuffix(urlParts[0], "/") + "/api/search?query=" + searchPattern
if len(urlParts) > 1 {
query = query + "&" + urlParts[1]
}
resp, code, _, err := httputil.HttpGet(query, auth, time.Second*10, nil, nil)
return resp, code, err
}