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service.go
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service.go
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package udf
import (
"fmt"
"log"
"os"
"sync"
"time"
"github.com/influxdata/kapacitor"
"github.com/influxdata/kapacitor/command"
)
type Service struct {
functionConfig map[string]FunctionConfig
functions map[string]kapacitor.UDFProcessInfo
logger *log.Logger
mu sync.RWMutex
}
func NewService(c Config, l *log.Logger) *Service {
return &Service{
functionConfig: c.Functions,
functions: make(map[string]kapacitor.UDFProcessInfo),
logger: l,
}
}
func (s *Service) Open() error {
for name := range s.functionConfig {
err := s.RefreshFunction(name)
if err != nil {
return err
}
}
return nil
}
func (s *Service) Close() error {
return nil
}
func (s *Service) FunctionList() []string {
s.mu.RLock()
defer s.mu.RUnlock()
functions := make([]string, 0, len(s.functions))
for name := range s.functions {
functions = append(functions, name)
}
return functions
}
func (s *Service) FunctionInfo(name string) (kapacitor.UDFProcessInfo, bool) {
s.mu.RLock()
defer s.mu.RUnlock()
info, ok := s.functions[name]
return info, ok
}
func (s *Service) RefreshFunction(name string) error {
s.mu.Lock()
defer s.mu.Unlock()
fc, ok := s.functionConfig[name]
if ok {
info, err := s.loadProcessInfo(fc)
if err != nil {
return fmt.Errorf("failed to load process info for %q: %v", name, err)
}
s.functions[name] = info
s.logger.Printf("D! loaded UDF %q", name)
return nil
}
return fmt.Errorf("no function %s configured", name)
}
func (s *Service) loadProcessInfo(f FunctionConfig) (kapacitor.UDFProcessInfo, error) {
env := os.Environ()
for k, v := range f.Env {
env = append(env, fmt.Sprintf("%s=%s", k, v))
}
commander := command.CommandInfo{
Prog: f.Prog,
Args: f.Args,
Env: env,
}
p := kapacitor.NewUDFProcess(commander, s.logger, time.Duration(f.Timeout), nil)
err := p.Start()
if err != nil {
return kapacitor.UDFProcessInfo{}, err
}
defer p.Stop()
return p.Info()
}