feat(api): revamp scheduling to introduce system schedules (#2433)

* feat(api): revamp scheduling to introduce system schedules

* fix(api): fix linting issues

* fix(api): fix lint issues

* refactor(api): fix lint issues

api/cron/job_script_execution.go

@@ -0,0 +1,76 @@
+package cron
+
+import (
+	"log"
+
+	"github.com/portainer/portainer"
+)
+
+// ScriptExecutionJobRunner is used to run a ScriptExecutionJob
+type ScriptExecutionJobRunner struct {
+	job     *portainer.ScriptExecutionJob
+	context *ScriptExecutionJobContext
+}
+
+// ScriptExecutionJobContext represents the context of execution of a ScriptExecutionJob
+type ScriptExecutionJobContext struct {
+	jobService      portainer.JobService
+	endpointService portainer.EndpointService
+	fileService     portainer.FileService
+}
+
+// NewScriptExecutionJobContext returns a new context that can be used to execute a ScriptExecutionJob
+func NewScriptExecutionJobContext(jobService portainer.JobService, endpointService portainer.EndpointService, fileService portainer.FileService) *ScriptExecutionJobContext {
+	return &ScriptExecutionJobContext{
+		jobService:      jobService,
+		endpointService: endpointService,
+		fileService:     fileService,
+	}
+}
+
+// NewScriptExecutionJobRunner returns a new runner that can be scheduled
+func NewScriptExecutionJobRunner(job *portainer.ScriptExecutionJob, context *ScriptExecutionJobContext) *ScriptExecutionJobRunner {
+	return &ScriptExecutionJobRunner{
+		job:     job,
+		context: context,
+	}
+}
+
+// Run triggers the execution of the job.
+// It will iterate through all the endpoints specified in the context to
+// execute the script associated to the job.
+func (runner *ScriptExecutionJobRunner) Run() {
+	scriptFile, err := runner.context.fileService.GetFileContent(runner.job.ScriptPath)
+	if err != nil {
+		log.Printf("scheduled job error (script execution). Unable to retrieve script file (err=%s)\n", err)
+		return
+	}
+
+	for _, endpointID := range runner.job.Endpoints {
+		endpoint, err := runner.context.endpointService.Endpoint(endpointID)
+		if err != nil {
+			log.Printf("scheduled job error (script execution). Unable to retrieve information about endpoint (id=%d) (err=%s)\n", endpointID, err)
+			return
+		}
+
+		err = runner.context.jobService.Execute(endpoint, "", runner.job.Image, scriptFile)
+		if err != nil {
+			log.Printf("scheduled job error (script execution). Unable to execute scrtip (endpoint=%s) (err=%s)\n", endpoint.Name, err)
+		}
+	}
+}
+
+// GetScheduleID returns the schedule identifier associated to the runner
+func (runner *ScriptExecutionJobRunner) GetScheduleID() portainer.ScheduleID {
+	return runner.job.ScheduleID
+}
+
+// SetScheduleID sets the schedule identifier associated to the runner
+func (runner *ScriptExecutionJobRunner) SetScheduleID(ID portainer.ScheduleID) {
+	runner.job.ScheduleID = ID
+}
+
+// GetJobType returns the job type associated to the runner
+func (runner *ScriptExecutionJobRunner) GetJobType() portainer.JobType {
+	return portainer.ScriptExecutionJobType
+}