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119 lines
2.5 KiB
119 lines
2.5 KiB
package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/robfig/cron/v3"
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)
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var jobResultsLock = sync.Mutex{}
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var jobResults = map[string]JobResult{}
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type JobResult struct {
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JobName string
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JobType string
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Success bool
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LastError error
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Message string
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}
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func (r JobResult) Format() string {
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return fmt.Sprintf("%s %s ok? %v\n\n%+v", r.JobName, r.JobType, r.Success, r.LastError)
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}
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func JobComplete(result JobResult) {
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fmt.Printf("Completed job %+v\n", result)
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jobResultsLock.Lock()
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jobResults[result.JobName] = result
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jobResultsLock.Unlock()
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}
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func writeJobResult(writer http.ResponseWriter, jobName string) {
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if jobResult, ok := jobResults[jobName]; ok {
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if !jobResult.Success {
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writer.WriteHeader(http.StatusServiceUnavailable)
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}
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jobResult.Message = jobResult.LastError.Error()
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if err := json.NewEncoder(writer).Encode(jobResult); err != nil {
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_, _ = writer.Write([]byte(fmt.Sprintf("failed writing json for %s", jobResult.Format())))
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}
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writer.Header().Set("Content-Type", "application/json")
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} else {
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writer.WriteHeader(http.StatusNotFound)
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_, _ = writer.Write([]byte("{\"Message\": \"Unknown job\"}"))
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}
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}
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func healthHandleFunc(writer http.ResponseWriter, request *http.Request) {
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query := request.URL.Query()
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if jobName, ok := query["job"]; ok {
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writeJobResult(writer, jobName[0])
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return
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}
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_, _ = writer.Write([]byte("ok"))
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}
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func RunHTTPHandlers(addr string) error {
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http.HandleFunc("/health", healthHandleFunc)
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http.Handle("/metrics", promhttp.Handler())
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return fmt.Errorf("error on healthcheck: %w", http.ListenAndServe(addr, nil)) //#nosec: g114
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}
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func ScheduleAndRunJobs(jobs []Job) error {
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signalChan := make(chan os.Signal, 1)
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signal.Notify(
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signalChan,
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syscall.SIGINT,
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syscall.SIGTERM,
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syscall.SIGQUIT,
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)
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scheduler := cron.New()
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for _, job := range jobs {
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fmt.Println("Scheduling", job.Name)
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if _, err := scheduler.AddJob(job.Schedule, job); err != nil {
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return fmt.Errorf("error scheduling job %s: %w", job.Name, err)
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}
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}
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scheduler.Start()
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switch <-signalChan {
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case syscall.SIGINT:
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fmt.Println("Stopping now...")
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defer scheduler.Stop()
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return nil
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case syscall.SIGTERM:
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fallthrough
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case syscall.SIGQUIT:
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// Wait for all jobs to complete
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fmt.Println("Stopping after running jobs complete...")
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defer func() {
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ctx := scheduler.Stop()
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<-ctx.Done()
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}()
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return nil
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}
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return nil
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}
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