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88 lines
1.7 KiB
Go
88 lines
1.7 KiB
Go
package serverinfo
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import (
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"log"
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"os"
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"os/exec"
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"path"
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"strings"
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"time"
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)
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type Config struct {
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ScriptsDir string
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CacheTimeout time.Duration
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}
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type cacheEntry struct {
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creationTime time.Time
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output string
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}
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type Service struct {
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Config *Config
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scriptPaths map[string]string
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scriptOutputCache map[string]cacheEntry
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}
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func NewService(config *Config) *Service {
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return &Service{
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Config: config,
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scriptPaths: map[string]string{},
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scriptOutputCache: map[string]cacheEntry{},
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}
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}
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func (s *Service) LoadScripts() error {
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entries, err := os.ReadDir(s.Config.ScriptsDir)
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if err != nil {
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return err
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}
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s.scriptPaths = map[string]string{}
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for _, entry := range entries {
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newScriptPath := path.Join(s.Config.ScriptsDir, entry.Name())
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s.scriptPaths[entry.Name()] = newScriptPath
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}
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return nil
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}
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func (s *Service) InvalidateCache() {
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log.Printf("Invalidating monitor cache")
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s.scriptOutputCache = map[string]cacheEntry{}
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}
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func (s *Service) GetOutput(command string) (string, error) {
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// check if output is present in cache
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if entry, found := s.scriptOutputCache[command]; found {
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// check if cached value is expired
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if time.Now().Before(entry.creationTime.Add(s.Config.CacheTimeout)) {
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log.Printf("Retrieving output of %q from cache", command)
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return entry.output, nil
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}
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}
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args := strings.Fields(command)
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log.Printf("Running script %q with args %v", args[0], args[1:])
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scriptPath := s.scriptPaths[args[0]]
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bytes, err := exec.Command(scriptPath, args[1:]...).Output()
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if err != nil {
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return "", err
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}
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output := string(bytes)
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log.Printf("Caching output of %q", command)
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s.scriptOutputCache[command] = cacheEntry{time.Now(), output}
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return output, nil
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}
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