/
probe.go
199 lines (158 loc) · 4.95 KB
/
probe.go
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package probe
import (
"context"
"flag"
"fmt"
"path/filepath"
"strings"
"time"
"github.com/cprobe/cprobe/lib/fileutil"
"github.com/cprobe/cprobe/lib/logger"
"github.com/pkg/errors"
)
var (
pluginsFilter = flag.String("plugins", "", "Filter plugins, separated by comma, e.g. -plugins=mysql,redis")
)
func listPlugins(configDirectory string) ([]string, error) {
pluginDirs, err := fileutil.DirsUnder(configDirectory)
if err != nil {
return nil, errors.Wrap(err, "cannot list plugin dirs")
}
if *pluginsFilter == "" {
return pluginDirs, nil
}
ret := make([]string, 0, len(pluginDirs))
filters := strings.Split(strings.ReplaceAll(*pluginsFilter, ":", ","), ",")
for i := 0; i < len(pluginDirs); i++ {
for j := 0; j < len(filters); j++ {
if pluginDirs[i] == filters[j] {
ret = append(ret, pluginDirs[i])
}
}
}
return ret, nil
}
// Start starts the probe goroutines.
func Start(ctx context.Context, configDirectory string) error {
pluginDirs, err := listPlugins(configDirectory)
if err != nil {
return err
}
if len(pluginDirs) == 0 {
return fmt.Errorf("no plugin dirs found under %s", configDirectory)
}
for i := 0; i < len(pluginDirs); i++ {
if err := startPlugin(ctx, configDirectory, pluginDirs[i]); err != nil {
return errors.Wrapf(err, "cannot start plugin %s", pluginDirs[i])
}
}
return nil
}
func startPlugin(ctx context.Context, configDirectory, pluginDir string) error {
pluginDirPath := filepath.Join(configDirectory, pluginDir)
entryYamlFilePaths, err := filepath.Glob(filepath.Join(pluginDirPath, "main*.yaml"))
if err != nil {
return errors.Wrapf(err, "cannot glob main*.yaml under %s", pluginDirPath)
}
if len(entryYamlFilePaths) == 0 {
return nil
}
for i := 0; i < len(entryYamlFilePaths); i++ {
if err = startEntry(ctx, pluginDir, entryYamlFilePaths[i]); err != nil {
return errors.Wrapf(err, "cannot start entry %s", entryYamlFilePaths[i])
}
}
return nil
}
var PluginCfgs = make(map[string][]*Config)
func startEntry(ctx context.Context, pluginName, entryYamlFilePath string) error {
cfg, err := loadConfig(entryYamlFilePath)
if err != nil {
return err
}
PluginCfgs[pluginName] = append(PluginCfgs[pluginName], cfg)
pluginJobs, has := Jobs[pluginName]
if !has {
return fmt.Errorf("unsupported plugin %s", pluginName)
}
for i := range cfg.ScrapeConfigs {
if cfg.ScrapeConfigs[i] == nil {
continue
}
jobID := JobID{YamlFile: entryYamlFilePath, JobName: cfg.ScrapeConfigs[i].JobName}
jobGoroutine := NewJobGoroutine(pluginName, cfg.ScrapeConfigs[i])
pluginJobs[jobID] = jobGoroutine
// 启动 goroutine,稍微 sleep 一下,避免所有 goroutine 同时启动
time.Sleep(time.Millisecond * 10)
go jobGoroutine.Start(ctx)
}
return nil
}
// Reload 读取磁盘配置文件,与内存中的配置文件进行比较,增删 JobGoroutine
func Reload(ctx context.Context, configDirectory string) {
newJobs, err := readFiles(configDirectory)
if err != nil {
logger.Errorf("cannot read files: %s", err)
return
}
// 遍历内存中的老 Jobs,如果磁盘上的新 Jobs 中没有,就删除
for pluginName, jobs := range Jobs {
newPluginJobs := newJobs[pluginName]
for jobID, jobGoroutine := range jobs {
_, has := newPluginJobs[jobID]
if !has {
jobGoroutine.Stop()
delete(jobs, jobID)
}
}
}
// 遍历磁盘中的新 Jobs,如果内存中老 Jobs 没有,就新增,有就更新
for pluginName, jobs := range newJobs {
oldPluginJobs := Jobs[pluginName]
for jobID, jobGoroutine := range jobs {
oldJobGoroutine, has := oldPluginJobs[jobID]
if !has {
oldPluginJobs[jobID] = jobGoroutine
time.Sleep(time.Millisecond * 20)
go oldPluginJobs[jobID].Start(ctx)
continue
}
oldJobGoroutine.UpdateConfig(jobGoroutine.scrapeConfig)
}
}
}
func readFiles(configDirectory string) (map[string]map[JobID]*JobGoroutine, error) {
pluginDirs, err := listPlugins(configDirectory)
if err != nil {
return nil, err
}
newJobs := makeJobs()
for i := 0; i < len(pluginDirs); i++ {
pluginDir := pluginDirs[i]
pluginDirPath := filepath.Join(configDirectory, pluginDir)
entryYamlFilePaths, err := filepath.Glob(filepath.Join(pluginDirPath, "main*.yaml"))
if err != nil {
return nil, fmt.Errorf("cannot glob main*.yaml under %s: %s", pluginDirPath, err)
}
for i := 0; i < len(entryYamlFilePaths); i++ {
entryYamlFilePath := entryYamlFilePaths[i]
cfg, err := loadConfig(entryYamlFilePath)
if err != nil {
return nil, fmt.Errorf("cannot load config %s: %s", entryYamlFilePath, err)
}
pluginJobs, has := newJobs[pluginDir]
if !has {
return nil, fmt.Errorf("unsupported plugin %s", pluginDir)
}
for i := range cfg.ScrapeConfigs {
if cfg.ScrapeConfigs[i] == nil {
continue
}
jobID := JobID{YamlFile: entryYamlFilePath, JobName: cfg.ScrapeConfigs[i].JobName}
jobGoroutine := NewJobGoroutine(pluginDir, cfg.ScrapeConfigs[i])
pluginJobs[jobID] = jobGoroutine
}
}
}
return newJobs, nil
}