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grafana_client.go
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grafana_client.go
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package grafanadashboard
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strings"
"time"
"sigs.k8s.io/controller-runtime/pkg/log"
"github.com/grafana-operator/grafana-operator/v4/api/integreatly/v1alpha1"
)
const (
DeleteDashboardByUIDUrl = "%v/api/dashboards/uid/%v"
CreateOrUpdateDashboardUrl = "%v/api/dashboards/db"
CreateOrUpdateFolderUrl = "%v/api/folders"
DeleteFolderByUIDUrl = "%v/api/folders/%v"
GetFolderByIDUrl = "%v/api/folders/id/%v"
)
const (
NonNamespacedFolderName = "Non-Namespaced"
)
type GrafanaRequest struct {
Dashboard json.RawMessage `json:"dashboard"`
FolderId int64 `json:"folderId"`
FolderName string `json:"folderName"`
Overwrite bool `json:"overwrite"`
}
type GrafanaResponse struct {
ID *uint `json:"id"`
OrgID *uint `json:"orgId"`
Message *string `json:"message"`
Slug *string `json:"slug"`
Version *int `json:"version"`
Status *string `json:"resp"`
UID *string `json:"uid"`
URL *string `json:"url"`
FolderId *int64 `json:"folderId"`
FolderName string `json:"folderName"`
}
type GrafanaFolderRequest struct {
Title string `json:"title"`
}
type GrafanaDashboardResponse struct {
Meta *GrafanaDashboardMeta `json:"meta,omitempty"`
Dashboard *GrafanaDashboard `json:"dashboard,omitempty"`
}
type GrafanaDashboard struct {
ID *uint `json:"id"`
UID *string `json:"uid"`
Title *string `json:"title"`
Version *uint `json:"version"`
}
type GrafanaDashboardMeta struct {
FolderID *uint `json:"folderId"`
FolderTitle *string `json:"folderTitle"`
Version *uint `json:"version"`
}
type GrafanaFolderResponse struct {
ID *int64 `json:"id"`
Title string `json:"title"`
UID string `json:"uid"`
}
type GrafanaClient interface {
CreateOrUpdateDashboard(dashboard []byte, folderId int64, folderName string) (GrafanaResponse, error)
DeleteDashboardByUID(UID string) (GrafanaResponse, error)
CreateOrUpdateFolder(folderName string) (GrafanaFolderResponse, error)
DeleteFolder(folderID *int64) error
SafeToDelete(dashboards []*v1alpha1.GrafanaDashboardRef, folderID *int64) bool
GetDashboard(UID string) (GrafanaDashboardResponse, error)
}
type GrafanaClientImpl struct {
url string
user string
password string
client *http.Client
}
func setHeaders(req *http.Request) {
req.Header.Set("Accept", "application/json")
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", "grafana-operator")
}
func NewGrafanaClient(url, user, password string, transport *http.Transport, timeoutSeconds time.Duration) GrafanaClient {
client := &http.Client{
Transport: transport,
Timeout: time.Second * timeoutSeconds,
}
return &GrafanaClientImpl{
url: url,
user: user,
password: password,
client: client,
}
}
func (r *GrafanaClientImpl) GetDashboard(UID string) (GrafanaDashboardResponse, error) {
rawURL := fmt.Sprintf(DeleteDashboardByUIDUrl, r.url, UID)
response := newDashboardResponse()
parsed, err := url.Parse(rawURL)
if err != nil {
return response, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("GET", parsed.String(), nil)
if err != nil {
return response, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
if resp.StatusCode == 404 {
return response, err
} else if resp.StatusCode != 200 {
return response, fmt.Errorf(
"error searching for dashboard, expected status 200 but got %v",
resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return response, err
}
err = json.Unmarshal(data, &response)
return response, err
}
func (r *GrafanaClientImpl) getAllFolders() ([]GrafanaFolderResponse, error) {
rawURL := fmt.Sprintf(CreateOrUpdateFolderUrl, r.url)
parsed, err := url.Parse(rawURL)
if err != nil {
return nil, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("GET", parsed.String(), nil)
if err != nil {
return nil, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
// Grafana might be unavailable, no reason to panic, other checks are in place
if resp.StatusCode == 503 {
return nil, nil
} else {
return nil, fmt.Errorf(
"error getting folders, expected status 200 but got %v",
resp.StatusCode)
}
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
var folders []GrafanaFolderResponse
err = json.Unmarshal(data, &folders)
return folders, err
}
func (r *GrafanaClientImpl) CreateOrUpdateFolder(folderInputName string) (GrafanaFolderResponse, error) {
response := newFolderResponse()
allfolders, err := r.getAllFolders()
if err != nil {
return response, err
}
for _, folder := range allfolders {
if strings.EqualFold(folder.Title, folderInputName) {
return folder, nil
}
}
rawURL := fmt.Sprintf(CreateOrUpdateFolderUrl, r.url)
parsed, err := url.Parse(rawURL)
if err != nil {
return response, err
}
var title = folderInputName
if title == "" {
title = NonNamespacedFolderName
}
raw, err := json.Marshal(GrafanaFolderRequest{
Title: title,
})
if err != nil {
return response, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("POST", parsed.String(), bytes.NewBuffer(raw))
if err != nil {
return response, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
if resp.StatusCode == 503 {
return GrafanaFolderResponse{}, nil
} else {
return response, fmt.Errorf(
"error creating folder, expected status 200 but got %v",
resp.StatusCode)
}
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return response, err
}
err = json.Unmarshal(data, &response)
return response, err
}
// Submit dashboard json to grafana
func (r *GrafanaClientImpl) CreateOrUpdateDashboard(dashboard []byte, folderID int64, folderName string) (GrafanaResponse, error) {
rawURL := fmt.Sprintf(CreateOrUpdateDashboardUrl, r.url)
response := newResponse()
parsed, err := url.Parse(rawURL)
if err != nil {
return response, err
}
// Grafana expects some additional data along with the dashboard
raw, err := json.Marshal(GrafanaRequest{
Dashboard: dashboard,
FolderId: folderID,
FolderName: folderName,
// We always want to set `overwrite` because the uids in the CRs map
// directly to dashboards in grafana
Overwrite: true,
})
if err != nil {
return response, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("POST", parsed.String(), bytes.NewBuffer(raw))
if err != nil {
return response, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 && resp.StatusCode != 503 {
return response, fmt.Errorf(
"error creating dashboard, expected status 200 but got %v",
resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return response, err
}
err = json.Unmarshal(data, &response)
return response, err
}
// Delete a dashboard given by a UID
func (r *GrafanaClientImpl) DeleteDashboardByUID(UID string) (GrafanaResponse, error) {
rawURL := fmt.Sprintf(DeleteDashboardByUIDUrl, r.url, UID)
response := newResponse()
parsed, err := url.Parse(rawURL)
if err != nil {
return response, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("DELETE", parsed.String(), nil)
if err != nil {
return response, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return response, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return response, fmt.Errorf(
"error deleting dashboard, expected status 200 but got %v",
resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return response, err
}
err = json.Unmarshal(data, &response)
return response, err
}
func newFolderResponse() GrafanaFolderResponse {
var id int64 = 0
return GrafanaFolderResponse{
ID: &id,
}
}
func newResponse() GrafanaResponse {
var id uint = 0
var orgID uint = 0
var version int = 0
var status = "(empty)"
var message = "(empty)"
var slug string
var uid string
var url string
return GrafanaResponse{
ID: &id,
OrgID: &orgID,
Message: &message,
Slug: &slug,
Version: &version,
Status: &status,
UID: &uid,
URL: &url,
}
}
func newDashboardResponse() GrafanaDashboardResponse {
var id uint = 0
var version uint = 0
var uid string
var title string
dashboard := GrafanaDashboard{
ID: &id,
UID: &uid,
Version: &version,
Title: &title,
}
return GrafanaDashboardResponse{
Dashboard: &dashboard,
}
}
func (r *GrafanaClientImpl) getFolderUID(IDInput *int64) (*string, error) {
rawURL := fmt.Sprintf(GetFolderByIDUrl, r.url, *IDInput)
response := newFolderResponse()
parsed, err := url.Parse(rawURL)
if err != nil {
return nil, err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("GET", parsed.String(), nil)
if err != nil {
return nil, err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, fmt.Errorf(
"error finding folder %v, expected status 200 but got %v", IDInput,
resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
err = json.Unmarshal(data, &response)
if err != nil {
return nil, err
}
return &response.UID, nil
}
func (r *GrafanaClientImpl) DeleteFolder(deleteID *int64) error {
deleteUID, err := r.getFolderUID(deleteID)
if err != nil {
return err
}
rawURL := fmt.Sprintf(DeleteFolderByUIDUrl, r.url, *deleteUID)
response := newResponse()
parsed, err := url.Parse(rawURL)
if err != nil {
return err
}
parsed.User = url.UserPassword(r.user, r.password)
req, err := http.NewRequest("DELETE", parsed.String(), nil)
if err != nil {
return err
}
setHeaders(req)
resp, err := r.client.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf(
"error deleting folder, expected status 200 but got %v",
resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
err = json.Unmarshal(data, &response)
log.Log.Info(fmt.Sprintf("delete result was %v", *response.Message))
return err
}
func (r *GrafanaClientImpl) SafeToDelete(dashlist []*v1alpha1.GrafanaDashboardRef, id *int64) bool {
for _, dashboard := range dashlist {
if *dashboard.FolderId == *id {
return false
}
}
return true
}