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client.go
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client.go
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// Copyright 2017 Mattias Pernhult. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package goiaf
// TODO: add functionality for cache headers
import (
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"strconv"
"strings"
"time"
)
const (
baseURL string = "http://www.anapioficeandfire.com/api"
booksEndpoint string = baseURL + "/books"
charactersEndpoint string = baseURL + "/characters"
housesEndpoint string = baseURL + "/houses"
)
// Client interface which reflects the endpoint for the api.
// All endpoints will be exposed with this client.
type Client interface {
// Returns all books from the api. There is also the possibility
// to include filter parameters in your request. The possible filter
// parameters are exposed by the BookRequest interface.
Books(BookRequest) (BookResponse, error)
// Returns a specific book based on the given id.
Book(int) (Book, error)
// Returns all characters from the api. There is also the possibility
// to include filter parameters in your request. The possible filter
// parameters are exposed by the CharacterRequest interface.
Characters(CharacterRequest) (CharacterResponse, error)
// Return a specific character based on the given id.
Character(int) (Character, error)
// Returns all houses from the api. There is also the possibility
// to include filter parameters in your request. The possible filter
// parameters are exposed by the HouseRequest interface.
Houses(HouseRequest) (HouseResponse, error)
// Return a specific house based on the given id.
House(int) (House, error)
}
type client struct {
httpClient http.Client
}
// NewClient returns a ice and fire client. All endpoints from the api
// are exposed through this client.
func NewClient() Client {
return &client{
httpClient: http.Client{
Timeout: time.Second * 15,
},
}
}
func (c *client) Books(request BookRequest) (BookResponse, error) {
booksResponse := booksResponse{}
err := c.get(booksEndpoint, request, &booksResponse)
if err != nil {
return BookResponse{}, err
}
response := BookResponse{
Data: booksResponse.Convert(),
links: booksResponse.links,
}
return response, nil
}
func (c *client) Book(id int) (Book, error) {
endpoint := fmt.Sprintf("%s/%d", booksEndpoint, id)
book := book{}
err := c.get(endpoint, nil, &book)
if err != nil {
return Book{}, err
}
return book.Convert(), nil
}
func (c *client) Characters(request CharacterRequest) (CharacterResponse, error) {
charactersResponse := charactersResponse{}
err := c.get(charactersEndpoint, request, &charactersResponse)
if err != nil {
return CharacterResponse{}, err
}
response := CharacterResponse{
Data: charactersResponse.Convert(),
links: charactersResponse.links,
}
return response, nil
}
func (c *client) Character(id int) (Character, error) {
endpoint := fmt.Sprintf("%s/%d", charactersEndpoint, id)
character := character{}
err := c.get(endpoint, nil, &character)
if err != nil {
return Character{}, err
}
return character.Convert(), nil
}
func (c *client) Houses(request HouseRequest) (HouseResponse, error) {
housesResponse := housesResponse{}
err := c.get(housesEndpoint, request, &housesResponse)
if err != nil {
return HouseResponse{}, err
}
response := HouseResponse{
Data: housesResponse.Convert(),
links: housesResponse.links,
}
return response, nil
}
func (c *client) House(id int) (House, error) {
endpoint := fmt.Sprintf("%s/%d", housesEndpoint, id)
house := house{}
err := c.get(endpoint, nil, &house)
if err != nil {
return House{}, err
}
return house.Convert(), nil
}
func (c *client) get(endpoint string, converter ParamConverter, data interface{}) error {
if converter != nil {
endpoint = fmt.Sprintf("%s?%s", endpoint, converter.Convert().Encode())
}
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return err
}
req.Close = true
resp, err := c.httpClient.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusNotFound {
return ErrResourceNotFound
}
if t, ok := data.(linker); ok {
t.Link(c.getLinks(resp.Header.Get("link")))
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
return json.Unmarshal(b, data)
}
func (c *client) getLinks(linkHeader string) map[string]string {
result := map[string]string{}
if linkHeader == "" {
return result
}
links := strings.Split(linkHeader, ",")
for _, link := range links {
link = strings.TrimSpace(link)
linkPair := strings.Split(link, ";")
urlStr := strings.TrimSpace(linkPair[0])
rel := strings.Replace(strings.TrimSpace(linkPair[1]), "rel=", "", 1)
urlStr = urlStr[1 : len(urlStr)-1]
rel = rel[1 : len(rel)-1]
result[rel] = urlStr
}
return result
}
func getQueryFromURL(urlStr string) (url.Values, error) {
if urlStr == "" {
return nil, ErrNoResultSet
}
u, err := url.ParseRequestURI(urlStr)
if err != nil {
return nil, err
}
return u.Query(), nil
}
func getPageInfo(query url.Values) (int, int, error) {
pageStr, pageSizeStr := query.Get("page"), query.Get("pageSize")
if pageStr == "" || pageSizeStr == "" {
return 0, 0, ErrPaginationInfoMissing
}
page, err := strconv.Atoi(pageStr)
if err != nil {
return 0, 0, err
}
pageSize, err := strconv.Atoi(pageSizeStr)
if err != nil {
return 0, 0, err
}
return page, pageSize, nil
}