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http.go
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http.go
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package kiteapi
/*
HTTP helper functions with methods for parsing Kite style JSON envelopes.
*/
import (
"encoding/json"
"io"
"io/ioutil"
"log"
"net/http"
"net/url"
"os"
"strings"
"time"
)
// HTTPClient represents an HTTP client.
type HTTPClient interface {
Do(method, rURL string, params url.Values, headers http.Header) (HTTPResponse, error)
DoEnvelope(method, url string, params url.Values, headers http.Header, obj interface{}) error
DoJSON(method, url string, params url.Values, headers http.Header, obj interface{}) (HTTPResponse, error)
GetClient() *httpClient
}
// httpClient is the default implementation of HTTPClient.
type httpClient struct {
client *http.Client
hLog *log.Logger
debug bool
}
// HTTPResponse encompasses byte body + the response of an HTTP request.
type HTTPResponse struct {
Body []byte
Response *http.Response
}
type errorEnvelope struct {
Status string `json:"status"`
ErrorType string `json:"error_type"`
Message string `json:"message"`
Data interface{} `json:"data"`
}
type envelope struct {
Data interface{} `json:"data"`
}
// NewHTTPClient returns a self-contained HTTP request object
// with underlying keep-alive transport.
func NewHTTPClient(h *http.Client, hLog *log.Logger, debug bool) HTTPClient {
if hLog == nil {
hLog = log.New(os.Stdout, "base.HTTP: ", log.Ldate|log.Ltime|log.Lshortfile)
}
if h == nil {
h = &http.Client{
Timeout: time.Duration(5) * time.Second,
Transport: &http.Transport{
MaxIdleConnsPerHost: 10,
ResponseHeaderTimeout: time.Second * time.Duration(5),
},
}
}
return &httpClient{
hLog: hLog,
client: h,
debug: debug,
}
}
// Do executes an HTTP request and returns the response.
func (h *httpClient) Do(method, rURL string, params url.Values, headers http.Header) (HTTPResponse, error) {
var (
resp = HTTPResponse{}
postParams io.Reader
err error
)
if params == nil {
params = url.Values{}
}
// Encode POST / PUT params.
if method == http.MethodPost || method == http.MethodPut {
postParams = strings.NewReader(params.Encode())
}
req, err := http.NewRequest(method, rURL, postParams)
if err != nil {
h.hLog.Printf("Request preparation failed: %v", err)
return resp, NewError(NetworkError, "Request preparation failed.", nil)
}
if headers != nil {
req.Header = headers
}
// If a content-type isn't set, set the default one.
if req.Header.Get("Content-Type") == "" {
if method == http.MethodPost || method == http.MethodPut {
req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
}
}
// If the request method is GET or DELETE, add the params as QueryString.
if method == http.MethodGet || method == http.MethodDelete {
req.URL.RawQuery = params.Encode()
}
r, err := h.client.Do(req)
if err != nil {
h.hLog.Printf("Request failed: %v", err)
return resp, NewError(NetworkError, "Request failed.", nil)
}
defer r.Body.Close()
body, err := ioutil.ReadAll(r.Body)
if err != nil {
h.hLog.Printf("Unable to read response: %v", err)
return resp, NewError(DataError, "Error reading response.", nil)
}
resp.Response = r
resp.Body = body
if h.debug {
h.hLog.Printf("%s %s -- %d %v", method, req.URL.RequestURI(), resp.Response.StatusCode, req.Header)
}
return resp, nil
}
// DoEnvelope makes an HTTP request and parses the JSON response (fastglue envelop structure)
func (h *httpClient) DoEnvelope(method, url string, params url.Values, headers http.Header, obj interface{}) error {
resp, err := h.Do(method, url, params, headers)
if err != nil {
return err
}
// Successful request, but error envelope.
if resp.Response.StatusCode >= http.StatusBadRequest {
var e errorEnvelope
if err := json.Unmarshal(resp.Body, &e); err != nil {
h.hLog.Printf("Error parsing JSON response: %v", err)
return NewError(DataError, "Error parsing response.", nil)
}
return NewError(e.ErrorType, e.Message, e.Data)
}
// We now unmarshal the body.
envl := envelope{}
envl.Data = obj
if err := json.Unmarshal(resp.Body, &envl); err != nil {
h.hLog.Printf("Error parsing JSON response: %v | %s", err, resp.Body)
return NewError(DataError, "Error parsing response.", nil)
}
return nil
}
// DoJSON makes an HTTP request and parses the JSON response.
func (h *httpClient) DoJSON(method, url string, params url.Values, headers http.Header, obj interface{}) (HTTPResponse, error) {
resp, err := h.Do(method, url, params, headers)
if err != nil {
return resp, err
}
// We now unmarshal the body.
if err := json.Unmarshal(resp.Body, &obj); err != nil {
h.hLog.Printf("Error parsing JSON response: %v | %s", err, resp.Body)
return resp, NewError(DataError, "Error parsing response.", nil)
}
return resp, nil
}
// GetClient return's the underlying net/http client.
func (h *httpClient) GetClient() *httpClient {
return h
}