feat(hatchery/swarm): get register error from docker (#3654)

Author: fsamin

engine/hatchery/swarm/swarm_util_kill.go

@@ -1,6 +1,8 @@
 package swarm
 
 import (
+	"fmt"
+	"io/ioutil"
 	"strconv"
 	"strings"
 	"time"
@@ -37,11 +39,36 @@ func (h *HatcherySwarm) killAndRemove(dockerClient *dockerClient, ID string) err
 				log.Error("hatchery> swarm> killAndRemove> unable to get model from registering container %s", container.Name)
 			} else {
 				if err := hatchery.CheckWorkerModelRegister(h, modelID); err != nil {
+					ctx, cancel := context.WithTimeout(context.Background(), time.Minute*2)
+					defer cancel()
+					logsOpts := types.ContainerLogsOptions{
+						Details:    true,
+						ShowStderr: true,
+						ShowStdout: true,
+						Timestamps: true,
+						Since:      "10s",
+					}
 					var spawnErr = sdk.SpawnErrorForm{
 						Error: err.Error(),
 					}
+
+					logsReader, errL := dockerClient.ContainerLogs(ctx, container.ID, logsOpts)
+					if errL != nil {
+						log.Error("hatchery> swarm> killAndRemove> cannot get logs from docker for containers service %s %v : %v", container.ID, container.Name, errL)
+						spawnErr.Logs = []byte(fmt.Sprintf("unable to get container logs: %v", errL))
+
+					} else if logsReader != nil {
+						defer logsReader.Close()
+						logs, errR := ioutil.ReadAll(logsReader)
+						if errR != nil {
+							log.Error("hatchery> swarm> killAndRemove> cannot read logs for containers service %s %v : %v", container.ID, container.Name, errR)
+						} else if logs != nil {
+							spawnErr.Logs = logs
+						}
+					}
+
 					if err := h.CDSClient().WorkerModelSpawnError(modelID, spawnErr); err != nil {
-						log.Error("CheckWorkerModelRegister> error on call client.WorkerModelSpawnError on worker model %d for register: %s", modelID, err)
+						log.Error("hatchery> swarm> killAndRemove> error on call client.WorkerModelSpawnError on worker model %d for register: %s", modelID, err)
 					}
 				}
 			}