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server.go
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server.go
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package httpserver
import (
"context"
"encoding/json"
"fmt"
"github.com/julienschmidt/httprouter"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/supreethrao/automated-rota-manager/pkg/helpers"
"github.com/supreethrao/automated-rota-manager/pkg/rota"
"github.com/supreethrao/automated-rota-manager/pkg/slackhandler"
"net/http"
"os"
"os/signal"
"syscall"
"time"
)
const (
httpServerPort = 9090
shutdownGracePeriod = 15 * time.Second
)
func Start(_ context.Context, slackMessager *slackhandler.Messager, myTeam *rota.Team) error {
router := httprouter.New()
router.POST("/members/:name", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
if err := myTeam.Add(params.ByName("name")); err != nil {
_, _ = fmt.Fprint(writer)
}
})
router.GET("/members", func(writer http.ResponseWriter, request *http.Request, _ httprouter.Params) {
writer.Header().Set("Content-Type", "application/json")
history, err := myTeam.RotaHistory()
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
_, _ = writer.Write([]byte(fmt.Sprintf("unable to get team memers %v", err)))
return
}
jsonData, _ := json.Marshal(history)
_, _ = writer.Write(jsonData)
})
router.DELETE("/members/:name", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
if err := myTeam.Remove(params.ByName("name")); err != nil {
_, _ = fmt.Fprint(writer)
}
})
router.POST("/outofoffice/:name/:from/:to", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
fromDate, errFrom := time.Parse("02-01-2006", params.ByName("from"))
toDate, errTo := time.Parse("02-01-2006", params.ByName("to"))
if errFrom != nil || errTo != nil {
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Invalid date format. From and To date should be in the format DD-MM-YYYY \n"))
return
}
dateToday, _ := time.Parse("02-01-2006", time.Now().Format("02-01-2006"))
if fromDate.After(toDate) || toDate.Before(dateToday) {
writer.WriteHeader(http.StatusBadRequest)
_, _ = writer.Write([]byte("Invalid date. From date cannot be greater than To date and also To date cannot be in the past"))
return
}
if setError := myTeam.SetOutOfOffice(params.ByName("name"), fromDate, toDate); setError != nil {
writer.WriteHeader(http.StatusInternalServerError)
// Need to do error mapping here
_, _ = fmt.Fprintln(writer, setError)
} else {
writer.WriteHeader(http.StatusCreated)
}
})
router.GET("/outofoffice", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
outOfOffice, err := myTeam.GetTeamOutOfOffice()
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
_, _ = writer.Write([]byte(fmt.Sprintf("unable to get team out of office due to error %v", err)))
return
}
_, _ = writer.Write(outOfOffice)
})
router.GET("/outofoffice/:name", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
_, _ = writer.Write(myTeam.GetOutOfOffice(params.ByName("name")))
})
router.GET("/rota/next", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
nextPerson, err := myTeam.Next()
if err != nil {
writer.WriteHeader(http.StatusInternalServerError)
_, _ = writer.Write([]byte(fmt.Sprintf("unable to get pick next person on rota %v", err)))
return
}
_, _ = fmt.Fprintf(writer, "The person picked today is: %s. \n", nextPerson)
})
router.GET("/rota/confirm/:name/:date", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
personPickedToday := params.ByName("name")
if time.Now().Format("02-01-2006") != params.ByName("date") {
_, _ = writer.Write([]byte("Illegal confirmation. Date has to be today"))
return
}
if isHoliday, whichOne := helpers.IsTodayHoliday(); isHoliday {
writer.WriteHeader(http.StatusForbidden)
_, _ = writer.Write([]byte(fmt.Sprintf("Cheeky attempt to pick a person on a holiday. Not happening as today is %s \n", whichOne)))
return
}
if err := myTeam.SetPersonPickedForToday(personPickedToday); err == nil {
_ = slackMessager.SendMessage(fmt.Sprintf("The person picked today is confirmed to be: %s \n", personPickedToday))
writer.WriteHeader(http.StatusAccepted)
} else {
writer.WriteHeader(http.StatusInternalServerError)
_, _ = fmt.Fprintln(writer, err)
}
})
router.GET("/rota/override/:name", func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
personToOverrideWith := params.ByName("name")
if isHoliday, whichOne := helpers.IsTodayHoliday(); isHoliday {
writer.WriteHeader(http.StatusForbidden)
_, _ = writer.Write([]byte(fmt.Sprintf("Cheeky attempt to override picking a person on a holiday. Not happening as today is %s \n", whichOne)))
return
}
if err := myTeam.OverridePersonPickedForToday(personToOverrideWith); err == nil {
_ = slackMessager.SendMessage(fmt.Sprintf("The rota pick for today was overridden. It's now: %s \n", personToOverrideWith))
writer.WriteHeader(http.StatusAccepted)
} else {
_, _ = fmt.Fprintln(writer, err)
}
})
router.GET("/metrics", func(writer http.ResponseWriter, request *http.Request, _ httprouter.Params) {
promhttp.Handler().ServeHTTP(writer, request)
})
httpServer := &http.Server{Addr: fmt.Sprintf(":%d", httpServerPort), Handler: router}
errChan := make(chan error, 1)
go func() {
err := httpServer.ListenAndServe()
errChan <- err
}()
return gracefulShutdown(httpServer, errChan)
}
func gracefulShutdown(httpServer *http.Server, serverError chan error) error {
signalHandler := make(chan os.Signal, 1)
signal.Notify(signalHandler, syscall.SIGTERM, syscall.SIGINT)
select {
case err := <-serverError:
return err
case <-signalHandler:
timeoutContext, cancel := context.WithTimeout(context.Background(), shutdownGracePeriod)
defer cancel()
return httpServer.Shutdown(timeoutContext)
}
}