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package handlers
import (
"encoding/json"
"fmt"
"log"
"net/http"
"time"
"github.com/pkg/errors"
"repodiff/constants"
e "repodiff/entities"
)
var globalJobStatus = constants.JobStatusNotStarted
var globalMeta string
var globalStartTime time.Time
type healthResponse struct {
ApplicationStatus string `json:"application_status"`
JobStatus string `json:"job_status"`
Meta string `json:"meta"`
ElapsedTime string `json:"elapsed_time"`
}
func writeJsonResponse(writer http.ResponseWriter, entity interface{}) {
serialized, err := json.MarshalIndent(entity, "", " ")
if err != nil {
log.Fatal(err)
}
writer.Header().Set("Content-Type", "application/json")
writer.Write(serialized)
}
func handleHealth(writer http.ResponseWriter, request *http.Request) {
switch request.Method {
case "GET":
writeJsonResponse(
writer,
healthResponse{
ApplicationStatus: "ok",
JobStatus: globalJobStatus,
Meta: globalMeta,
ElapsedTime: fmt.Sprintf("%s", time.Now().Sub(globalStartTime)),
},
)
}
}
func listenForStatusChanges(statusChannel chan e.StatusMessage) {
for {
m := <-statusChannel
globalJobStatus = m.JobStatus
globalMeta = m.Meta
}
}
func StartHTTP(servePort int, statusChannel chan e.StatusMessage) error {
globalStartTime = time.Now()
go listenForStatusChanges(statusChannel)
http.HandleFunc("/health", handleHealth)
return errors.Wrap(
http.ListenAndServe(
fmt.Sprintf(":%d", servePort),
nil,
),
"Error starting web server",
)
}
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