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package coinbase
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"strings"
)
// basePath needed for reading mock JSON files in simulateRequest and for
// referencing ca-coinbase.crt in OAuthService. Must be fixed path because
// relative path changes depending on where library called
var basePath string = os.Getenv("GOPATH") + "/src/github.com/fabioberger/coinbase-go"
// Rpc handles the remote procedure call requests
type rpc struct {
auth authenticator
mock bool
}
// Request sends a request with params marshaled into a JSON payload in the body
// The response value is marshaled from JSON into the specified holder struct
func (r rpc) Request(method string, endpoint string, params interface{}, holder interface{}) error {
jsonParams, err := json.Marshal(params)
if err != nil {
return err
}
request, err := r.createRequest(method, endpoint, jsonParams)
if err != nil {
return err
}
var data []byte
if r.mock == true { // Mock mode: Replace actual request with expected JSON from file
data, err = r.simulateRequest(endpoint, method)
} else {
data, err = r.executeRequest(request)
}
if err != nil {
return err
}
if err := json.Unmarshal(data, &holder); err != nil {
return err
}
return nil
}
// CreateRequest formats a request with all the necessary headers
func (r rpc) createRequest(method string, endpoint string, params []byte) (*http.Request, error) {
endpoint = r.auth.getBaseUrl() + endpoint //BaseUrl depends on Auth type used
req, err := http.NewRequest(method, endpoint, bytes.NewBuffer(params))
if err != nil {
return nil, err
}
// Authenticate the request
r.auth.authenticate(req, endpoint, params)
req.Header.Set("User-Agent", "CoinbaseGo/v1")
req.Header.Set("Content-Type", "application/json")
return req, nil
}
// executeRequest takes a prepared http.Request and returns the body of the response
// If the response is not of HTTP Code 200, an error is returned
func (r rpc) executeRequest(req *http.Request) ([]byte, error) {
resp, err := r.auth.getClient().Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
buf := new(bytes.Buffer)
buf.ReadFrom(resp.Body)
bytes := buf.Bytes()
if resp.StatusCode != 200 {
if len(bytes) == 0 { // Log response body for debugging purposes
log.Printf("Response body was empty")
} else {
log.Printf("Response body:\n\t%s\n", bytes)
}
return nil, fmt.Errorf("%s %s failed. Response code was %s", req.Method, req.URL, resp.Status)
}
return bytes, nil
}
// simulateRequest simulates a request by returning a sample JSON from file
func (r rpc) simulateRequest(endpoint string, method string) ([]byte, error) {
// Test files conform to replacing '/' in endpoint with '_'
fileName := strings.Replace(endpoint, "/", "_", -1)
// file names also have method type prepended to ensure uniqueness
filePath := basePath + "/test_data/" + method + "_" + fileName + ".json"
data, err := ioutil.ReadFile(filePath)
if err != nil {
return nil, err
}
return data, nil
}
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