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service, net, cmd/microservice: add microservice example, simplify mi…
…croservice init code, move http request structure to cmd/flatend
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package flatend | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "github.com/lithdew/kademlia" | ||
| "net" | ||
| "os" | ||
| "os/signal" | ||
| ) | ||
|
|
||
| type Service struct { | ||
| Addr string | ||
| BindAddr string | ||
|
|
||
| PrivateKey kademlia.PrivateKey | ||
| Services map[string]Handler | ||
| } | ||
|
|
||
| func (s Service) Start() error { | ||
| addr := s.Addr | ||
| if addr == "" { | ||
| return errors.New("address to flatend hub must be provided") | ||
| } | ||
|
|
||
| bindAddr := s.BindAddr | ||
| if bindAddr == "" { | ||
| bindAddr = ":0" | ||
| } | ||
|
|
||
| var err error | ||
|
|
||
| privateKey := s.PrivateKey | ||
| if privateKey == kademlia.ZeroPrivateKey { | ||
| _, privateKey, err = kademlia.GenerateKeys(nil) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to generate keys: %w", err) | ||
| } | ||
| } | ||
|
|
||
| ln, err := net.Listen("tcp", bindAddr) | ||
| if err != nil { | ||
| return fmt.Errorf("failed to listen on bind addr '%s': %w", bindAddr, err) | ||
| } | ||
|
|
||
| node, err := NewNode(privateKey, ln.Addr().String()) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for service, handler := range s.Services { | ||
| node.Register(service, handler) | ||
| } | ||
|
|
||
| errCh := make(chan error, 1) | ||
| go func() { | ||
| errCh <- node.Serve(ln) | ||
| }() | ||
|
|
||
| if err := node.Dial(addr); err != nil { | ||
| return fmt.Errorf("failed to reach flatend hub: %w", err) | ||
| } | ||
|
|
||
| ch := make(chan os.Signal, 1) | ||
| signal.Notify(ch, os.Interrupt) | ||
| <-ch | ||
|
|
||
| node.Shutdown() | ||
| ln.Close() | ||
|
|
||
| return <-errCh | ||
| } |