automerge failure patch (#1917)

* automerge failure patch

* grammar

* add extra logging

Author: motatoes

backend/controllers/projects.go

@@ -493,7 +493,10 @@ func (d DiggerController) SetJobStatusForProject(c *gin.Context) {
 	err = AutomergePRforBatchIfEnabled(d.GithubClientProvider, batch)
 	if err != nil {
 		log.Printf("Error merging PR with automerge option: %v", err)
-		c.JSON(http.StatusInternalServerError, gin.H{"error": "Error merging PR with automerge option"})
+		err = utils.PostCommentForBatch(job.Batch, fmt.Sprintf(":yellow_circle: Warning could not automerge PR, please remember to merge it manually. Error: (%v)", err), d.GithubClientProvider)
+		if err != nil {
+			log.Printf("Error while posting comment about automerge: %v", err)
+		}
 	}
 
 	// return batch summary to client

backend/utils/batch_utils.go

@@ -0,0 +1,26 @@
+package utils
+
+import (
+	"fmt"
+	"github.com/diggerhq/digger/backend/models"
+	"log"
+)
+
+func PostCommentForBatch(batch *models.DiggerBatch, comment string, githubClientProvider GithubClientProvider) error {
+	// todo: perform for rest of vcs as well
+	if batch.VCS == models.DiggerVCSGithub {
+		ghService, _, err := GetGithubService(githubClientProvider, batch.GithubInstallationId, batch.RepoFullName, batch.RepoOwner, batch.RepoName)
+		if err != nil {
+			log.Printf("error getting ghService: %v", err)
+			return fmt.Errorf("error getting ghService: %v", err)
+		}
+		_, err = ghService.PublishComment(batch.PrNumber, comment)
+		if err != nil {
+			log.Printf("error publishing comment (%v): %v", comment, err)
+			return fmt.Errorf("error publishing comment (%v): %v", comment, err)
+		}
+		return nil
+	}
+	log.Printf("Warning: Unknown vcs type: %v", batch.VCS)
+	return nil
+}