forgejo-runner/cmd/damon.go

package cmd

import (
	"context"
	"encoding/json"
	"errors"
	"os"
	"os/signal"
	"strings"
	"syscall"
	"time"

	"github.com/gorilla/websocket"
	"github.com/rs/zerolog/log"
	"github.com/spf13/cobra"
)

type Message struct {
	Version      int    //
	Type         int    // message type, 1 register 2 error
	RunnerUUID   string // runner uuid
	BuildUUID    string // build uuid
	ErrCode      int    // error code
	ErrContent   string // errors message
	EventName    string
	EventPayload string
	JobID        string // only run the special job, empty means run all the jobs
}

const (
	MsgTypeRegister     = iota + 1 // register
	MsgTypeError                   // error
	MsgTypeRequestBuild            // request build task
	MsgTypeIdle                    // no task
	MsgTypeBuildResult             // build result
)

func runDaemon(ctx context.Context, input *Input) func(cmd *cobra.Command, args []string) error {
	log.Info().Msgf("Starting runner daemon")

	return func(cmd *cobra.Command, args []string) error {
		var conn *websocket.Conn
		var err error
		ticker := time.NewTicker(time.Second)
		defer ticker.Stop()
		var failedCnt int
		for {
			select {
			case <-ctx.Done():
				if conn != nil {
					err = conn.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
					if err != nil {
						log.Error().Msgf("write close: %v", err)
					}
				}
				if errors.Is(ctx.Err(), context.Canceled) {
					return nil
				}
				return ctx.Err()
			case <-ticker.C:
				if conn == nil {
					log.Trace().Msgf("trying connect %v", "ws://localhost:3000/api/actions")
					conn, _, err = websocket.DefaultDialer.DialContext(ctx, "ws://localhost:3000/api/actions", nil)
					if err != nil {
						log.Error().Msgf("dial: %v", err)
						break
					}

					// register the client
					msg := Message{
						Version:    1,
						Type:       MsgTypeRegister,
						RunnerUUID: "111111",
					}
					bs, err := json.Marshal(&msg)
					if err != nil {
						log.Error().Msgf("Marshal: %v", err)
						break
					}

					if err = conn.WriteMessage(websocket.TextMessage, bs); err != nil {
						log.Error().Msgf("register failed: %v", err)
						conn.Close()
						conn = nil
						break
					}
				}

				const timeout = time.Second * 10

				for {
					conn.SetReadDeadline(time.Now().Add(timeout))
					conn.SetPongHandler(func(string) error { conn.SetReadDeadline(time.Now().Add(timeout)); return nil })

					_, message, err := conn.ReadMessage()
					if err != nil {
						if websocket.IsCloseError(err, websocket.CloseAbnormalClosure) ||
							websocket.IsCloseError(err, websocket.CloseNormalClosure) {
							log.Trace().Msgf("closed from remote")
							conn.Close()
							conn = nil
						} else if !strings.Contains(err.Error(), "i/o timeout") {
							log.Error().Msgf("read message failed: %#v", err)
						}
						failedCnt++
						if failedCnt > 60 {
							if conn != nil {
								conn.Close()
								conn = nil
							}
							failedCnt = 0
						}
						break
					}

					// TODO: handle the message
					var msg Message
					if err = json.Unmarshal(message, &msg); err != nil {
						log.Error().Msgf("unmarshal received message faild: %v", err)
						continue
					}
					switch msg.Version {
					case 1:
						switch msg.Type {
						case MsgTypeRegister:
							log.Info().Msgf("received registered success: %s", message)
							conn.WriteJSON(&Message{
								Version:    1,
								Type:       MsgTypeRequestBuild,
								RunnerUUID: msg.RunnerUUID,
							})
						case MsgTypeError:
							log.Info().Msgf("received error msessage: %s", message)
							conn.WriteJSON(&Message{
								Version:    1,
								Type:       MsgTypeRequestBuild,
								RunnerUUID: msg.RunnerUUID,
							})
						case MsgTypeIdle:
							log.Info().Msgf("received no task")
							conn.WriteJSON(&Message{
								Version:    1,
								Type:       MsgTypeRequestBuild,
								RunnerUUID: msg.RunnerUUID,
							})
						case MsgTypeRequestBuild:
							switch msg.EventName {
							case "push":
								input := Input{
									forgeInstance:   "github.com",
									reuseContainers: true,
								}

								ctx, cancel := context.WithTimeout(context.Background(), time.Hour)
								defer cancel()
								sigs := make(chan os.Signal, 1)
								signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
								done := make(chan error)
								go func(chan error) {
									done <- runTask(ctx, &input, "")
								}(done)

								c := time.NewTicker(time.Second)
								defer c.Stop()

							END:
								for {
									select {
									case <-sigs:
										cancel()
										log.Info().Msgf("cancel task")
										break END
									case err := <-done:
										if err != nil {
											log.Error().Msgf("runTask failed: %v", err)
											conn.WriteJSON(&Message{
												Version:    1,
												Type:       MsgTypeBuildResult,
												RunnerUUID: msg.RunnerUUID,
												BuildUUID:  msg.BuildUUID,
												ErrCode:    1,
												ErrContent: err.Error(),
											})
										} else {
											log.Error().Msgf("runTask success")
											conn.WriteJSON(&Message{
												Version:    1,
												Type:       MsgTypeBuildResult,
												RunnerUUID: msg.RunnerUUID,
												BuildUUID:  msg.BuildUUID,
											})
										}

										break END
									case <-c.C:
									}
								}

							default:
								log.Warn().Msgf("unknow event %s with payload %s", msg.EventName, msg.EventPayload)
							}

						default:
							log.Error().Msgf("received a message with an unsupported type: %#v", msg)
						}
					default:
						log.Error().Msgf("recevied a message with an unsupported version, consider upgrade your runner")
					}
				}
			}
		}
	}
}