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new.go
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new.go
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// Copyright 2018 mixtool 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 main
import (
"fmt"
"os"
"github.com/monitoring-mixins/mixtool/pkg/mixer"
"github.com/urfave/cli"
)
func newCommand() cli.Command {
return cli.Command{
Name: "new",
Usage: "Create new jsonnet mixin files",
Description: "Create new files for Prometheus alerts & rules and Grafana dashboards as jsonnet mixin",
Subcommands: cli.Commands{
cli.Command{
Name: "grafana-dashboard",
Usage: "Create a new file with a Grafana dashboard mixin inside",
Action: newGrafanaDashboard,
},
cli.Command{
Name: "prometheus-alerts",
Usage: "Create a new file with Prometheus alert mixins inside",
Action: newPrometheusAlerts,
},
cli.Command{
Name: "prometheus-rules",
Usage: "Create a new file with Prometheus rule mixins inside",
Action: newPrometheusRules,
},
},
}
}
func newGrafanaDashboard(c *cli.Context) error {
if len(c.Args()) != 1 {
return fmt.Errorf("expected filename as only argument")
}
filename := c.Args().First()
if fileExists(filename) {
return fmt.Errorf("file already exists. not overwriting")
}
return writeFileToDisk(filename, mixer.NewGrafanaDashboard)
}
func newPrometheusAlerts(c *cli.Context) error {
if len(c.Args()) != 1 {
return fmt.Errorf("expected filename as only argument")
}
filename := c.Args().First()
if fileExists(filename) {
return fmt.Errorf("file already exists. not overwriting")
}
return writeFileToDisk(filename, mixer.NewPrometheusAlerts)
}
func newPrometheusRules(c *cli.Context) error {
if len(c.Args()) != 1 {
return fmt.Errorf("expected filename as only argument")
}
filename := c.Args().First()
if fileExists(filename) {
return fmt.Errorf("file already exists. not overwriting")
}
return writeFileToDisk(filename, mixer.NewPrometheusRules)
}
func fileExists(filename string) bool {
_, err := os.Stat(filename)
if os.IsNotExist(err) {
return false
}
if err != nil {
return false
}
return true
}
func writeFileToDisk(filename string, creator func() ([]byte, error)) error {
f, err := os.Create(filename)
if err != nil {
return fmt.Errorf("failed to create file %s: %v", filename, err)
}
defer f.Close()
out, err := creator()
if err != nil {
return fmt.Errorf("failed to create new rules: %v", err)
}
if _, err := f.Write(out); err != nil {
return err
}
if err := f.Sync(); err != nil {
return fmt.Errorf("failed to sync file to disk %s: %v", filename, err)
}
return nil
}