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dashboard.go
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dashboard.go
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// Copyright 2016 The prometheus-operator Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package updater
import (
"log"
"os"
"path/filepath"
"github.com/coreos/prometheus-operator/contrib/grafana-watcher/grafana"
)
type Updater interface {
Init() error
OnModify() error
}
type GrafanaDashboardUpdater struct {
client grafana.DashboardsInterface
globs []string
}
func NewGrafanaDashboardUpdater(c grafana.DashboardsInterface, g []string) Updater {
return &GrafanaDashboardUpdater{
client: c,
globs: g,
}
}
func (u *GrafanaDashboardUpdater) Init() error {
return u.updateDashboards()
}
func (u *GrafanaDashboardUpdater) OnModify() error {
return u.updateDashboards()
}
func (u *GrafanaDashboardUpdater) updateDashboards() error {
err := u.deleteAllDashboards()
if err != nil {
return err
}
err = u.createDashboardsFromFiles()
if err != nil {
return err
}
return nil
}
func (u *GrafanaDashboardUpdater) deleteAllDashboards() error {
log.Println("Retrieving existing dashboards")
searchResults, err := u.client.Search()
if err != nil {
return err
}
log.Printf("Deleting %d dashboards\n", len(searchResults))
for _, d := range searchResults {
log.Println("Deleting dashboard:", d.Slug())
err := u.client.Delete(d.Slug())
if err != nil {
return err
}
}
return nil
}
func (u *GrafanaDashboardUpdater) createDashboardsFromFiles() error {
for _, glob := range u.globs {
filePaths, err := filepath.Glob(filepath.Join(glob, "*-dashboard.json"))
if err != nil {
return err
}
for _, fp := range filePaths {
err = u.createDashboardFromFile(fp)
if err != nil {
return err
}
}
}
return nil
}
func (u *GrafanaDashboardUpdater) createDashboardFromFile(filePath string) error {
log.Println("Creating dashboard from:", filePath)
f, err := os.Open(filePath)
if err != nil {
return err
}
defer f.Close()
return u.client.Create(f)
}