/
provider.go
133 lines (122 loc) · 3.59 KB
/
provider.go
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package eth
import (
"context"
"fmt"
"net/http"
"strconv"
"github.com/lukasmoellerch/mensa-cli/internal/base"
"github.com/mailru/easyjson"
"golang.org/x/sync/errgroup"
)
var _ base.Provider = (*Provider)(nil)
type Provider struct{}
func (p *Provider) Id() string {
return "eth"
}
func (p *Provider) Label() string {
return "ETH"
}
func (p *Provider) FetchMenus(ctx context.Context, canteens []base.CanteenRef, date string, daytime string, lang string) ([]base.CanteenMenu, error) {
ids := make([]int, len(canteens))
for i, canteen := range canteens {
id, err := strconv.Atoi(canteen.ID)
if err != nil {
return []base.CanteenMenu{}, err
}
ids[i] = id
}
eg, ctx := errgroup.WithContext(ctx)
menus := make([]base.CanteenMenu, len(ids))
for i, canteenID := range ids {
i, canteenID := i, canteenID
eg.Go(func() error {
menu, err := fetchMenu(ctx, canteenID, lang, date, daytime)
if err != nil {
return err
}
menus[i].Canteen = strconv.Itoa(menu.ID)
meals := make([]base.Meal, len(menu.Menu.Meals))
for j, meal := range menu.Menu.Meals {
meals[j].Label = meal.Label
meals[j].Description = meal.Description
studentPrice, err := base.ParsePrice(meal.Prices.Student)
if err != nil {
return err
}
meals[j].Prices.Student = studentPrice
staffPrice, err := base.ParsePrice(meal.Prices.Staff)
if err != nil {
return err
}
meals[j].Prices.Staff = staffPrice
externPrice, err := base.ParsePrice(meal.Prices.Extern)
if err != nil {
return err
}
meals[j].Prices.Extern = externPrice
}
menus[i].Meals = meals
return nil
})
}
if err := eg.Wait(); err != nil {
return []base.CanteenMenu{}, err
}
return menus, nil
}
func (p *Provider) FetchCanteens(ctx context.Context, lang string) ([]base.CanteenMetadata, error) {
facilities, err := fetchFacilities(ctx)
if err != nil {
return []base.CanteenMetadata{}, err
}
metadatas := make([]base.CanteenMetadata, len(facilities.Facilites))
for i, facility := range facilities.Facilites {
metadatas[i].ID = strconv.Itoa(facility.ID)
if lang == "de" {
metadatas[i].Label = facility.Label
} else {
metadatas[i].Label = facility.LabelEn
}
}
return metadatas, nil
}
func fetchMenu(ctx context.Context, canteenID int, lang string, date string, daytime string) (MensaMenuResponse, error) {
url := fmt.Sprintf("https://www.webservices.ethz.ch/gastro/v1/RVRI/Q1E1/mensas/%d/%s/menus/daily/%s/%s", canteenID, lang, date, daytime)
// Make http request and decode response as json
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return MensaMenuResponse{}, err
}
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return MensaMenuResponse{}, err
}
defer resp.Body.Close()
var menu MensaMenuResponse
err = easyjson.UnmarshalFromReader(resp.Body, &menu)
if err != nil {
return MensaMenuResponse{}, err
}
return menu, nil
}
func fetchFacilities(ctx context.Context) (FacilitiesListResponse, error) {
url := "https://www.webservices.ethz.ch/gastro/v1/RVRI/Q1E1/facilities"
// Make http request and decode response as json
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return FacilitiesListResponse{}, err
}
req.Header.Set("Accept", "application/json")
resp, err := http.DefaultClient.Do(req)
if err != nil {
return FacilitiesListResponse{}, err
}
defer resp.Body.Close()
var facilities FacilitiesListResponse
err = easyjson.UnmarshalFromReader(resp.Body, &facilities)
if err != nil {
return FacilitiesListResponse{}, err
}
return facilities, nil
}