Job scheduler for Restic backups
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package main
import (
"encoding/json"
"fmt"
"net/http"
"os"
"os/signal"
"sync"
"syscall"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/robfig/cron/v3"
)
var jobResultsLock = sync.Mutex{}
var jobResults = map[string]JobResult{}
type JobResult struct {
JobName string
JobType string
Success bool
LastError error
Message string
}
func (r JobResult) Format() string {
return fmt.Sprintf("%s %s ok? %v\n\n%+v", r.JobName, r.JobType, r.Success, r.LastError)
}
func JobComplete(result JobResult) {
fmt.Printf("Completed job %+v\n", result)
jobResultsLock.Lock()
jobResults[result.JobName] = result
jobResultsLock.Unlock()
}
func writeJobResult(writer http.ResponseWriter, jobName string) {
if jobResult, ok := jobResults[jobName]; ok {
if !jobResult.Success {
writer.WriteHeader(http.StatusServiceUnavailable)
}
jobResult.Message = jobResult.LastError.Error()
if err := json.NewEncoder(writer).Encode(jobResult); err != nil {
_, _ = writer.Write([]byte(fmt.Sprintf("failed writing json for %s", jobResult.Format())))
}
writer.Header().Set("Content-Type", "application/json")
} else {
writer.WriteHeader(http.StatusNotFound)
_, _ = writer.Write([]byte("{\"Message\": \"Unknown job\"}"))
}
}
func healthHandleFunc(writer http.ResponseWriter, request *http.Request) {
query := request.URL.Query()
if jobName, ok := query["job"]; ok {
writeJobResult(writer, jobName[0])
return
}
_, _ = writer.Write([]byte("ok"))
}
func RunHTTPHandlers(addr string) error {
http.HandleFunc("/health", healthHandleFunc)
http.Handle("/metrics", promhttp.Handler())
return fmt.Errorf("error on healthcheck: %w", http.ListenAndServe(addr, nil))
}
func ScheduleAndRunJobs(jobs []Job) error {
signalChan := make(chan os.Signal, 1)
signal.Notify(
signalChan,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
)
scheduler := cron.New()
for _, job := range jobs {
fmt.Println("Scheduling", job.Name)
if _, err := scheduler.AddJob(job.Schedule, job); err != nil {
return fmt.Errorf("error scheduling job %s: %w", job.Name, err)
}
}
scheduler.Start()
switch <-signalChan {
case syscall.SIGINT:
fmt.Println("Stopping now...")
defer scheduler.Stop()
return nil
case syscall.SIGTERM:
fallthrough
case syscall.SIGQUIT:
// Wait for all jobs to complete
fmt.Println("Stopping after running jobs complete...")
defer func() {
ctx := scheduler.Stop()
<-ctx.Done()
}()
return nil
}
return nil
}