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admin-prometheus-generate.go
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admin-prometheus-generate.go
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// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"fmt"
"net/url"
"time"
"github.com/fatih/color"
"github.com/minio/cli"
"github.com/minio/mc/pkg/probe"
"github.com/minio/pkg/console"
json "github.com/minio/colorjson"
yaml "gopkg.in/yaml.v2"
)
const (
defaultJobName = "minio-job"
defaultMetricsPath = "/minio/v2/metrics/cluster"
)
var prometheusFlags = []cli.Flag{
cli.BoolFlag{
Name: "public",
Usage: "disable bearer token generation for scrape_configs",
},
}
var adminPrometheusGenerateCmd = cli.Command{
Name: "generate",
Usage: "generates prometheus config",
Action: mainAdminPrometheusGenerate,
OnUsageError: onUsageError,
Before: setGlobalsFromContext,
Flags: append(prometheusFlags, globalFlags...),
HideHelpCommand: true,
CustomHelpTemplate: `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} TARGET
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}
EXAMPLES:
1. Generate a default prometheus config.
{{.Prompt}} {{.HelpName}} myminio
`,
}
// PrometheusConfig - container to hold the top level scrape config.
type PrometheusConfig struct {
ScrapeConfigs []ScrapeConfig `yaml:"scrape_configs,omitempty"`
}
// String colorized prometheus config yaml.
func (c PrometheusConfig) String() string {
b, err := yaml.Marshal(c)
if err != nil {
return fmt.Sprintf("error creating config string: %s", err)
}
return console.Colorize("yaml", string(b))
}
// JSON jsonified prometheus config.
func (c PrometheusConfig) JSON() string {
jsonMessageBytes, e := json.MarshalIndent(c.ScrapeConfigs[0], "", " ")
fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
return string(jsonMessageBytes)
}
// StatConfig - container to hold the targets config.
type StatConfig struct {
Targets []string `yaml:",flow" json:"targets"`
}
// String colorized stat config yaml.
func (t StatConfig) String() string {
b, err := yaml.Marshal(t)
if err != nil {
return fmt.Sprintf("error creating config string: %s", err)
}
return console.Colorize("yaml", string(b))
}
// JSON jsonified stat config.
func (t StatConfig) JSON() string {
jsonMessageBytes, e := json.MarshalIndent(t.Targets, "", " ")
fatalIf(probe.NewError(e), "Unable to marshal into JSON.")
return string(jsonMessageBytes)
}
// ScrapeConfig configures a scraping unit for Prometheus.
type ScrapeConfig struct {
JobName string `yaml:"job_name" json:"jobName"`
BearerToken string `yaml:"bearer_token,omitempty" json:"bearerToken,omitempty"`
MetricsPath string `yaml:"metrics_path,omitempty" json:"metricsPath"`
Scheme string `yaml:"scheme,omitempty" json:"scheme"`
StaticConfigs []StatConfig `yaml:"static_configs,omitempty" json:"staticConfigs"`
}
const (
defaultPrometheusJWTExpiry = 100 * 365 * 24 * time.Hour
)
var defaultConfig = PrometheusConfig{
ScrapeConfigs: []ScrapeConfig{
{
JobName: defaultJobName,
MetricsPath: defaultMetricsPath,
StaticConfigs: []StatConfig{
{
Targets: []string{""},
},
},
},
},
}
// checkAdminPrometheusSyntax - validate all the passed arguments
func checkAdminPrometheusSyntax(ctx *cli.Context) {
if len(ctx.Args()) != 1 {
cli.ShowCommandHelpAndExit(ctx, "generate", 1) // last argument is exit code
}
}
func generatePrometheusConfig(ctx *cli.Context) error {
// Get the alias parameter from cli
args := ctx.Args()
alias := cleanAlias(args.Get(0))
if !isValidAlias(alias) {
fatalIf(errInvalidAlias(alias), "Invalid alias.")
}
hostConfig := mustGetHostConfig(alias)
if hostConfig == nil {
fatalIf(errInvalidAliasedURL(alias), "No such alias `"+alias+"` found.")
return nil
}
u, e := url.Parse(hostConfig.URL)
if e != nil {
return e
}
if !ctx.Bool("public") {
token, e := getPrometheusToken(hostConfig)
if e != nil {
return e
}
// Setting the values
defaultConfig.ScrapeConfigs[0].BearerToken = token
}
defaultConfig.ScrapeConfigs[0].Scheme = u.Scheme
defaultConfig.ScrapeConfigs[0].StaticConfigs[0].Targets[0] = u.Host
printMsg(defaultConfig)
return nil
}
// mainAdminPrometheus is the handle for "mc admin prometheus generate" sub-command.
func mainAdminPrometheusGenerate(ctx *cli.Context) error {
console.SetColor("yaml", color.New(color.FgGreen))
checkAdminPrometheusSyntax(ctx)
if err := generatePrometheusConfig(ctx); err != nil {
return nil
}
return nil
}