Sergiusz Bazanski | ff5af69 | 2018-08-29 19:20:46 +0100 | [diff] [blame^] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "flag" |
| 6 | "net" |
| 7 | "net/http" |
| 8 | |
| 9 | "code.hackerspace.pl/q3k/hspki" |
| 10 | "github.com/golang/glog" |
| 11 | "github.com/q3k/statusz" |
| 12 | "github.com/ziutek/telnet" |
| 13 | "golang.org/x/net/trace" |
| 14 | "google.golang.org/grpc" |
| 15 | "google.golang.org/grpc/codes" |
| 16 | "google.golang.org/grpc/reflection" |
| 17 | "google.golang.org/grpc/status" |
| 18 | |
| 19 | pb "code.hackerspace.pl/q3k/m6220-proxy/proto" |
| 20 | ) |
| 21 | |
| 22 | var ( |
| 23 | flagListenAddress string |
| 24 | flagDebugAddress string |
| 25 | flagSwitchAddress string |
| 26 | flagSwitchUsername string |
| 27 | flagSwitchPassword string |
| 28 | ) |
| 29 | |
| 30 | func init() { |
| 31 | flag.Set("logtostderr", "true") |
| 32 | } |
| 33 | |
| 34 | type service struct { |
| 35 | connectionSemaphore chan int |
| 36 | } |
| 37 | |
| 38 | func (s *service) connect() (*cliClient, error) { |
| 39 | s.connectionSemaphore <- 1 |
| 40 | conn, err := telnet.Dial("tcp", flagSwitchAddress) |
| 41 | if err != nil { |
| 42 | <-s.connectionSemaphore |
| 43 | return nil, err |
| 44 | } |
| 45 | |
| 46 | cli := newCliClient(conn, flagSwitchUsername, flagSwitchPassword) |
| 47 | return cli, nil |
| 48 | } |
| 49 | |
| 50 | func (s *service) disconnect() { |
| 51 | <-s.connectionSemaphore |
| 52 | } |
| 53 | |
| 54 | func (s *service) RunCommand(ctx context.Context, req *pb.RunCommandRequest) (*pb.RunCommandResponse, error) { |
| 55 | if req.Command == "" { |
| 56 | return nil, status.Error(codes.InvalidArgument, "command cannot be null") |
| 57 | } |
| 58 | |
| 59 | cli, err := s.connect() |
| 60 | if err != nil { |
| 61 | return nil, status.Error(codes.Unavailable, "could not connect to backend") |
| 62 | } |
| 63 | defer s.disconnect() |
| 64 | |
| 65 | lines, effective, err := cli.runCommand(ctx, req.Command) |
| 66 | if err != nil { |
| 67 | return nil, err |
| 68 | } |
| 69 | res := &pb.RunCommandResponse{ |
| 70 | EffectiveCommand: effective, |
| 71 | Lines: lines, |
| 72 | } |
| 73 | return res, nil |
| 74 | } |
| 75 | |
| 76 | func main() { |
| 77 | flag.StringVar(&flagListenAddress, "listen_address", "127.0.0.1:42000", "Address to listen on for gRPC") |
| 78 | flag.StringVar(&flagDebugAddress, "debug_address", "127.0.0.1:42001", "Address to listen on for Debug HTTP") |
| 79 | flag.StringVar(&flagSwitchAddress, "switch_address", "127.0.0.1:23", "Telnet address of M6220") |
| 80 | flag.StringVar(&flagSwitchUsername, "switch_username", "admin", "Switch login username") |
| 81 | flag.StringVar(&flagSwitchPassword, "switch_password", "admin", "Switch login password") |
| 82 | flag.Parse() |
| 83 | |
| 84 | s := &service{ |
| 85 | connectionSemaphore: make(chan int, 1), |
| 86 | } |
| 87 | |
| 88 | grpc.EnableTracing = true |
| 89 | grpcLis, err := net.Listen("tcp", flagListenAddress) |
| 90 | if err != nil { |
| 91 | glog.Exitf("Could not listen on %v: %v", flagListenAddress, err) |
| 92 | } |
| 93 | grpcSrv := grpc.NewServer(hspki.WithServerHSPKI()...) |
| 94 | pb.RegisterM6220ProxyServer(grpcSrv, s) |
| 95 | reflection.Register(grpcSrv) |
| 96 | |
| 97 | glog.Infof("Starting gRPC on %v", flagListenAddress) |
| 98 | go func() { |
| 99 | if err := grpcSrv.Serve(grpcLis); err != nil { |
| 100 | glog.Exitf("Could not start gRPC: %v", err) |
| 101 | } |
| 102 | }() |
| 103 | |
| 104 | if flagDebugAddress != "" { |
| 105 | glog.Infof("Starting debug on %v", flagDebugAddress) |
| 106 | httpMux := http.NewServeMux() |
| 107 | httpMux.HandleFunc("/debug/status", statusz.StatusHandler) |
| 108 | httpMux.HandleFunc("/debug/requests", trace.Traces) |
| 109 | httpMux.HandleFunc("/", statusz.StatusHandler) |
| 110 | |
| 111 | httpLis, err := net.Listen("tcp", flagDebugAddress) |
| 112 | if err != nil { |
| 113 | glog.Exitf("Could not listen on %v: %v", flagDebugAddress, err) |
| 114 | } |
| 115 | httpSrv := &http.Server{ |
| 116 | Addr: flagDebugAddress, |
| 117 | Handler: httpMux, |
| 118 | } |
| 119 | |
| 120 | go func() { |
| 121 | if err := httpSrv.Serve(httpLis); err != nil { |
| 122 | glog.Exitf("Could not start HTTP server: %v", err) |
| 123 | } |
| 124 | }() |
| 125 | |
| 126 | } |
| 127 | |
| 128 | glog.Infof("Running!") |
| 129 | |
| 130 | select {} |
| 131 | } |