/
transport.go
191 lines (167 loc) · 5.06 KB
/
transport.go
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package bingo
import (
"context"
"encoding/json"
"errors"
"net/http"
"strconv"
"github.com/divyanshgaba/bingo/game"
"github.com/divyanshgaba/bingo/ticket"
"github.com/gorilla/mux"
kitlog "github.com/go-kit/kit/log"
"github.com/go-kit/kit/transport"
kithttp "github.com/go-kit/kit/transport/http"
)
var errBadRoute = errors.New("bingo: bad route")
// MakeHandler returns a handler for the bingo service.
func MakeHandler(bs Service, logger kitlog.Logger) http.Handler {
opts := []kithttp.ServerOption{
kithttp.ServerErrorHandler(transport.NewLogErrorHandler(logger)),
kithttp.ServerErrorEncoder(encodeError),
}
createGameHandler := kithttp.NewServer(
makeCreateGameEndpoint(bs),
decodeCreateGameRequest,
encodeResponse,
opts...,
)
createTicketHandler := kithttp.NewServer(
makeCreateTicketEndpoint(bs),
decodeCreateTicketRequest,
encodeResponse,
opts...,
)
generateNumberHandler := kithttp.NewServer(
makeGenerateNumberEndpoint(bs),
decodeGenerateNumberRequest,
encodeResponse,
opts...,
)
showTicketHandler := kithttp.NewServer(
makeShowTicketEndpoint(bs),
decodeShowTicketRequest,
encodeShowTicketResponse,
opts...,
)
getAllNumbersHandler := kithttp.NewServer(
makeGetAllNumbersEndpoint(bs),
decodeGetAllNumbersRequest,
encodeResponse,
opts...,
)
getStatsHandler := kithttp.NewServer(
makeGetStatsEndpoint(bs),
decodeGetStatsRequest,
encodeResponse,
opts...,
)
r := mux.NewRouter()
r.Handle("/api/game/create", createGameHandler).Methods(http.MethodPost)
r.Handle("/api/game/{gameId}/ticket/{username}/generate", createTicketHandler).Methods(http.MethodPost)
r.Handle("/api/game/{gameId}/number/random", generateNumberHandler).Methods(http.MethodGet)
r.Handle("/ticket/{ticketId}", showTicketHandler).Methods(http.MethodGet)
r.Handle("/api/game/{gameId}/numbers", getAllNumbersHandler).Methods(http.MethodGet)
r.Handle("/api/game/{gameId}/stats", getStatsHandler).Methods(http.MethodGet)
return r
}
func decodeCreateGameRequest(_ context.Context, r *http.Request) (interface{}, error) {
return createGameRequest{}, nil
}
func decodeCreateTicketRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
gameID, ok := vars["gameId"]
if !ok {
return nil, errBadRoute
}
username, ok := vars["username"]
if !ok {
return nil, errBadRoute
}
return createTicketRequest{GameID: game.ID(gameID), Username: username}, nil
}
func decodeGenerateNumberRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
gameID, ok := vars["gameId"]
if !ok {
return nil, errBadRoute
}
return generateNumberRequest{GameID: game.ID(gameID)}, nil
}
func decodeGetAllNumbersRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
gameID, ok := vars["gameId"]
if !ok {
return nil, errBadRoute
}
return getAllNumbersRequest{GameID: game.ID(gameID)}, nil
}
func decodeGetStatsRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
gameID, ok := vars["gameId"]
if !ok {
return nil, errBadRoute
}
return getStatsRequest{GameID: game.ID(gameID)}, nil
}
func decodeShowTicketRequest(_ context.Context, r *http.Request) (interface{}, error) {
vars := mux.Vars(r)
ticketID, ok := vars["ticketId"]
if !ok {
return nil, errBadRoute
}
return showTicketRequest{TicketID: ticket.ID(ticketID)}, nil
}
func encodeShowTicketResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
e, ok := response.(showTicketResponse)
if ok && e.error() != nil {
encodeError(ctx, e.error(), w)
return nil
}
ticket := e.Ticket
cells := ticket.Cells
table := "<table style='table-layout:fixed' border='1px solid black';>" + encodeTableRow(cells[:9]) + encodeTableRow(cells[9:18]) + encodeTableRow(cells[18:]) + "</table>"
w.Header().Set("Content-Type", "text/html; charset=utf-8")
w.Write([]byte(table))
return nil
}
func encodeTableRow(row []int64) string {
tds := ""
for _, r := range row {
if r != -1 {
tds = tds + "<td style='width: 11%;'>" + strconv.FormatInt(r, 10) + "</td>"
} else {
tds = tds + "<td style='width: 11%;'></td>"
}
}
return "<tr>" + tds + "</tr>"
}
// encode errors from business-logic
func encodeError(_ context.Context, err error, w http.ResponseWriter) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
switch err {
case game.ErrInvalidID:
w.WriteHeader(http.StatusBadRequest)
case ticket.ErrInvalidID:
w.WriteHeader(http.StatusBadRequest)
case ErrMaxNumbersGenerated:
w.WriteHeader(http.StatusBadRequest)
case ErrInvalidArgument:
w.WriteHeader(http.StatusBadRequest)
default:
w.WriteHeader(http.StatusInternalServerError)
}
json.NewEncoder(w).Encode(map[string]interface{}{
"error": err.Error(),
})
}
func encodeResponse(ctx context.Context, w http.ResponseWriter, response interface{}) error {
if e, ok := response.(errorer); ok && e.error() != nil {
encodeError(ctx, e.error(), w)
return nil
}
w.Header().Set("Content-Type", "application/json; charset=utf-8")
return json.NewEncoder(w).Encode(response)
}
type errorer interface {
error() error
}