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// Copyright 2020 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"context"
"encoding/json"
"fmt"
"os"
"os/exec"
"path/filepath"
"sync"
"github.com/pingcap/errors"
"github.com/pingcap/tiup/components/playground/instance"
tiupexec "github.com/pingcap/tiup/pkg/exec"
"github.com/pingcap/tiup/pkg/utils"
)
// ref: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#file_sd_config
func (m *monitor) renderSDFile(cid2targets map[string]instance.MetricAddr) error {
cid2targets["prometheus"] = instance.MetricAddr{Targets: []string{utils.JoinHostPort(m.host, m.port)}}
var items []instance.MetricAddr
for id, t := range cid2targets {
it := instance.MetricAddr{
Targets: t.Targets,
Labels: map[string]string{"job": id},
}
for k, v := range t.Labels {
it.Labels[k] = v
}
items = append(items, it)
}
data, err := json.MarshalIndent(&items, "", "\t")
if err != nil {
return errors.AddStack(err)
}
err = utils.WriteFile(m.sdFname, data, 0644)
if err != nil {
return errors.AddStack(err)
}
return nil
}
type monitor struct {
host string
port int
cmd *exec.Cmd
sdFname string
waitErr error
waitOnce sync.Once
}
func (m *monitor) wait() error {
m.waitOnce.Do(func() {
m.waitErr = m.cmd.Wait()
})
return m.waitErr
}
// the cmd is not started after return
func newMonitor(ctx context.Context, shOpt instance.SharedOptions, version string, host, dir string) (*monitor, error) {
if err := utils.MkdirAll(dir, 0755); err != nil {
return nil, errors.AddStack(err)
}
port := utils.MustGetFreePort(host, 9090, shOpt.PortOffset)
addr := utils.JoinHostPort(host, port)
tmpl := `
global:
scrape_interval: 15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
# scrape_timeout is set to the global default (10s).
# Alertmanager configuration
alerting:
alertmanagers:
- static_configs:
- targets:
# - alertmanager:9093
# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
rule_files:
# - "first_rules.yml"
# - "second_rules.yml"
# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
- job_name: 'cluster'
file_sd_configs:
- files:
- targets.json
`
m := new(monitor)
m.sdFname = filepath.Join(dir, "targets.json")
if err := utils.WriteFile(filepath.Join(dir, "prometheus.yml"), []byte(tmpl), os.ModePerm); err != nil {
return nil, errors.AddStack(err)
}
args := []string{
fmt.Sprintf("--config.file=%s", filepath.Join(dir, "prometheus.yml")),
fmt.Sprintf("--web.external-url=http://%s", addr),
fmt.Sprintf("--web.listen-address=%s", utils.JoinHostPort(host, port)),
fmt.Sprintf("--storage.tsdb.path=%s", filepath.Join(dir, "data")),
}
var binPath string
var err error
if binPath, err = tiupexec.PrepareBinary("prometheus", utils.Version(version), binPath); err != nil {
return nil, err
}
cmd := instance.PrepareCommand(ctx, binPath, args, nil, dir)
m.port = port
m.cmd = cmd
m.host = host
return m, nil
}
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