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client.go
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client.go
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package internal
import (
"bytes"
"encoding/json"
"fmt"
"io"
"net/http"
"strconv"
"time"
log "github.com/sirupsen/logrus"
"github.com/KnutZuidema/golio/api"
)
const (
apiURLFormat = "%s://%s.%s%s"
baseURL = "api.riotgames.com"
scheme = "https"
apiTokenHeaderKey = "X-Riot-Token"
)
// Client provides methods for communication with the Riot API.
type Client struct {
L log.FieldLogger
Region api.Region
APIKey string
Client Doer
}
// NewClient returns a new client.
func NewClient(region api.Region, key string, client Doer, logger log.FieldLogger) *Client {
return &Client{
L: logger,
Region: region,
APIKey: key,
Client: client,
}
}
// GetInto processes a GET request and saves the response body into the given target.
func (c *Client) GetInto(endpoint string, target interface{}) error {
logger := c.Logger().WithFields(
log.Fields{
"method": "GetInto",
"endpoint": endpoint,
},
)
response, err := c.Get(endpoint)
if err != nil {
logger.Debug(err)
return err
}
if err := json.NewDecoder(response.Body).Decode(target); err != nil {
logger.Debug(err)
return err
}
return nil
}
// PostInto processes a POST request and saves the response body into the given target.
func (c *Client) PostInto(endpoint string, body, target interface{}) error {
logger := c.Logger().WithFields(
log.Fields{
"method": "PostInto",
"endpoint": endpoint,
},
)
response, err := c.Post(endpoint, body)
if err != nil {
logger.Debug(err)
return err
}
if err := json.NewDecoder(response.Body).Decode(target); err != nil {
logger.Debug(err)
return err
}
return nil
}
// Put processes a PUT request.
func (c *Client) Put(endpoint string, body interface{}) error {
logger := c.Logger().WithFields(
log.Fields{
"method": "Put",
"endpoint": endpoint,
},
)
buf := &bytes.Buffer{}
if err := json.NewEncoder(buf).Encode(body); err != nil {
logger.Debug(err)
return err
}
_, err := c.DoRequest("PUT", endpoint, buf)
return err
}
// Get processes a GET request.
func (c *Client) Get(endpoint string) (*http.Response, error) {
return c.DoRequest("GET", endpoint, nil)
}
// Post processes a POST request.
func (c *Client) Post(endpoint string, body interface{}) (*http.Response, error) {
logger := c.Logger().WithFields(
log.Fields{
"method": "Post",
"endpoint": endpoint,
},
)
buf := &bytes.Buffer{}
if err := json.NewEncoder(buf).Encode(body); err != nil {
logger.Debug(err)
return nil, err
}
return c.DoRequest("POST", endpoint, buf)
}
// DoRequest processes a http.Request and returns the response.
// Rate-Limiting and retrying is handled via the corresponding response headers.
func (c *Client) DoRequest(method, endpoint string, body io.Reader) (*http.Response, error) {
logger := c.Logger().WithFields(
log.Fields{
"method": "DoRequest",
"endpoint": endpoint,
},
)
request, err := c.NewRequest(method, endpoint, body)
if err != nil {
logger.Debug(err)
return nil, err
}
response, err := c.Client.Do(request)
if err != nil {
logger.Debug(err)
return nil, err
}
if response.StatusCode == http.StatusServiceUnavailable {
logger.Info("service unavailable, retrying")
time.Sleep(time.Second)
response, err = c.Client.Do(request)
if err != nil {
logger.Debug(err)
return nil, err
}
}
if response.StatusCode == http.StatusTooManyRequests {
retry := response.Header.Get("Retry-After")
seconds, err := strconv.Atoi(retry)
if err != nil {
logger.Debug(err)
return nil, err
}
logger.Infof("rate limited, waiting %d seconds", seconds)
time.Sleep(time.Duration(seconds) * time.Second)
return c.DoRequest(method, endpoint, body)
}
if response.StatusCode < 200 || response.StatusCode > 299 {
logger.Debugf("error response: %v", response.Status)
err, ok := api.StatusToError[response.StatusCode]
if !ok {
err = api.Error{
Message: "unknown error reason",
StatusCode: response.StatusCode,
}
}
return nil, err
}
return response, nil
}
// NewRequest returns a new http.Request with necessary headers et.
func (c *Client) NewRequest(method, endpoint string, body io.Reader) (*http.Request, error) {
logger := c.Logger().WithFields(
log.Fields{
"method": "NewRequest",
"endpoint": endpoint,
},
)
request, err := http.NewRequest(method, fmt.Sprintf(apiURLFormat, scheme, c.Region, baseURL, endpoint), body)
if err != nil {
logger.Debug(err)
return nil, err
}
request.Header.Add(apiTokenHeaderKey, c.APIKey)
request.Header.Add("Accept", "application/json")
return request, nil
}
// Logger returns a logger with client specific fields set.
func (c *Client) Logger() log.FieldLogger {
return c.L.WithField("region", c.Region)
}