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api_backend.go
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/
api_backend.go
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package paperspace
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"log"
"math"
"net/http"
"net/http/httputil"
"os"
"time"
"github.com/google/go-querystring/query"
)
type Backend interface {
Request(method string, url string, params, result interface{}, requestParams RequestParams) (*http.Response, error)
}
var DefaultBaseURL = "https://api.paperspace.io"
var SuccessStatusCodes = []int{
http.StatusOK,
http.StatusCreated,
http.StatusAccepted,
http.StatusNonAuthoritativeInfo,
http.StatusNoContent,
}
type APIBackend struct {
BaseURL string
Debug bool
DebugBody bool
HTTPClient *http.Client
RetryCount int
}
func NewAPIBackend() *APIBackend {
apiBackend := APIBackend{
BaseURL: DefaultBaseURL,
HTTPClient: &http.Client{
Timeout: 15 * time.Second,
},
RetryCount: 0,
}
baseURL := os.Getenv("PAPERSPACE_BASEURL")
if baseURL != "" {
apiBackend.BaseURL = baseURL
}
debug := os.Getenv("PAPERSPACE_DEBUG")
if debug != "" {
apiBackend.Debug = true
}
debugBody := os.Getenv("PAPERSPACE_DEBUG_BODY")
if debugBody != "" {
apiBackend.DebugBody = true
}
return &apiBackend
}
func (c *APIBackend) Request(method string, url string,
params, result interface{}, requestParams RequestParams) (res *http.Response, err error) {
for i := 0; i < c.RetryCount+1; i++ {
retryDuration := time.Duration((math.Pow(2, float64(i))-1)/2*1000) * time.Millisecond
time.Sleep(retryDuration)
res, err = c.request(method, url, params, result, requestParams)
if res != nil && res.StatusCode == 429 {
continue
} else {
break
}
}
return res, err
}
func (c *APIBackend) request(method string, url string,
params, result interface{}, requestParams RequestParams) (res *http.Response, err error) {
var data []byte
var req *http.Request
body := bytes.NewReader(make([]byte, 0))
fullURL := fmt.Sprintf("%s%s", c.BaseURL, url)
switch method {
case "GET":
values, err := query.Values(params)
if err != nil {
return res, err
}
if len(values) > 0 {
fullURL += "?" + values.Encode()
}
case "POST":
if params != nil {
data, err = json.Marshal(params)
if err != nil {
return res, err
}
body = bytes.NewReader(data)
}
}
req, err = http.NewRequest(method, fullURL, body)
if err != nil {
return res, err
}
if requestParams.Context != nil {
req = req.WithContext(requestParams.Context)
}
req.Header.Add("Accept", "application/json")
req.Header.Add("Content-Type", "application/json")
req.Header.Add("User-Agent", "Go Paperspace Gradient 1.0")
for key, value := range requestParams.Headers {
req.Header.Add(key, value)
}
if c.Debug {
requestDump, err := httputil.DumpRequest(req, c.DebugBody)
if err != nil {
return res, err
}
c.debug(string(requestDump))
}
req.Close = true
res, err = c.HTTPClient.Do(req)
if err != nil {
return res, err
}
defer res.Body.Close()
if c.Debug {
responseDump, err := httputil.DumpResponse(res, c.DebugBody)
if err != nil {
return res, err
}
c.debug(string(responseDump))
}
isSuccessResponse := false
for _, statusCode := range SuccessStatusCodes {
if res.StatusCode == statusCode {
isSuccessResponse = true
break
}
}
if !isSuccessResponse {
defer res.Body.Close()
errorBody, err := io.ReadAll(res.Body)
if err != nil {
return res, err
}
errorReader := bytes.NewReader(errorBody)
paperspaceErrorResponse := PaperspaceErrorResponse{}
paperspaceError := PaperspaceError{}
errorResponseDecoder := json.NewDecoder(errorReader)
if err := errorResponseDecoder.Decode(&paperspaceErrorResponse); err != nil {
c.debug(string(err.Error()))
return res, errors.New("there was a server error, please try your request again")
}
if paperspaceErrorResponse.Error == nil {
errorDecoder := json.NewDecoder(errorReader)
if err := errorDecoder.Decode(&paperspaceErrorResponse); err != nil {
c.debug(string(err.Error()))
return res, errors.New("there was a server error, please try your request again")
}
return res, error(paperspaceError)
}
return res, error(paperspaceErrorResponse.Error)
}
if result != nil && res.StatusCode != http.StatusNoContent {
decoder := json.NewDecoder(res.Body)
if err = decoder.Decode(result); err != nil {
return res, err
}
}
return res, nil
}
func (c *APIBackend) debug(message string) {
if c.Debug {
log.Println(message)
}
}