Add functional for cancel job

esi/scraper/service.py

 from datetime import datetime
 from scrapyd_api import ScrapydAPI
-from .models import Spider, Job
+from .models import Job
 
 
 class Service:
@@ -20,9 +20,15 @@ class Service:
 
     def run_job(self, job):
         job = Job.objects.get(pk=job)
-        print(job.spider.sp_name)
         uuid = self.api.schedule('exa', job.spider.sp_name)
         job.job_uuid = uuid
         job.start_time = datetime.now()
         job.status = 'RUN'
         job.save()
+
+    def cancel_job(self, job):
+        job = Job.objects.get(pk=job)
+        self.api.cancel('exa', job.job_uuid)
+        job.end_time = datetime.now()
+        job.status = 'FIN'
+        job.save()