exchanges: Add OKX support (#1005)

* public endpoints methods added

* Completing mapping REST endpoints

* Binanceus Wrapper methods -Partially

* Binanceus Wrapper methods -Partially

* BinaWra functions with test funs; Not Completed

* Finalizing wrapper methods & test

* Fix & Complete wrapper functions

* Finalizing wrapper methods & test

* Adding Stream Datas

* WS Test functions

* CI: Fix golangci-lint linter issues

* CI: Fix reverting unnessesary changes and type conversion issues

* CI: Fix reverting unnessesary changes and type conversion issues

* Adding Public endpoints and tests

* Adding Market and Public Endpoints

* Adding Public endoints

* Public Trading Endpoints & Authenticated Trade order methods

* Adding Authenticated Methods and Tests

* Adding algo and Funding Authenticated endpoints

* Adding funding trading endpoints and correspondint tests

* adding authenticated endpoints

* Completing Block Trading endpoints and added subaccount endpoints

* Completing sub account and grid Trading endpoints

* Adding Rate Limit and missing endpoints

* Wrapper and Websocket handlers

* Fixing Websocket Test and Push Data Handler Issues

* Fixing Websocket Test and Push Data Handler Issues

* Fixing linter issues, package dependency, and other slight tempos

* Fixing linter and slight tempos

* Update on test functions, and Rest and Websocket Endpoint handlers

* Remove okex, adding comments, and slight fixes on endpoints.

* Fixing linter issues and adding comments

* Slight code changes, updating documentation, and n and linter issues

* Fix context and configuration endpoint issues

* slight fixes on config and test files

* adding some missing test and fix linter issues

* fix linter issue

* Slight fixes on code structure, shorthand exp,and ot and other

* Fix slight linter issue

* Slight code fixes and fixing linter issues

* fixing linter iissues

* fixing linter iissues

* slight linter issue fix

* slight linter issue fix

* Fix on models, type convert funcs and endpoints

* Adding Error messages map and update of models

* Fix on error message string and linter issues

* Fix slight linter issue

* Fix slight linter issue

* Fixing type converts, models, and linter issues

* Adding Ws fixes

* Slight fix on websocket and other issues

* Adding slight websocket fixes

* Remove 'books5' channel default subscription

* Small changes on default subscription and checksum

* Fix slight websocket tempos

* Fix Wrapper function tempost and linter issues

* Resolving slight naming and other issues

* Resolve slight pointer issues

* resolve slight linter issues

* Resolve config files issue

* Update websocket and wrapper funcs with test and docs

* fixs on websocket multiplexer, types, and other slight issues

* fix slight linter issues

* slight update on web-socket orderbook and tickers

* fix slight issues and websocket runtime errors

* Slight unit test fix and assing simple semaphore

* FIx race issue

* Update on authenticated endpoints

* Fix wsSetupRun check in websocket 'setupWsAuth' func

* Update wsSetupRun check in websocket 'setupWsAuth' func

* Slight update on websocket handling

* Fix some race conditions

* fix slight tempos

* fix authenticated test issues

* Update on conditional statements

* slight update on unit test

* fix unit test tempos

* Fix slight tempos

* Change check map from struct valued to bool valued

* slight fix trial

* Slight unit test update

* Fix websocket timeout error

* Updating websocket subscription endpoints, and unit tests

* update unit tests

* Slight issue on wrapper method 'GetActiveOrders'

* Overall code update

* Addressing missing review comments

* Fix unit test tempo and linter issue

* Monor fix

* Slight update

* Slight unit test fix

* Slight fixes

* Slight fixes

* Fixing on missing review comments

* Adding WS Fixes

* slight fix

* Monor fix on unit test

* Minor convert issue

* Minor change on WS

* Monor logic fix

* Fix code structure and logic issues

* Fixing small typos

* fix slight data format issue

* Update on trade and order wrapper methods

* Adding slight update

* fix on order detail

* Slight update on FetchTradablePairs wrapper method

* Slight update on wrapper

* Update on deserialization and other slight issues

* Final update

* Resolve missing review comments

* Slight update on config and unit test

* minor fix on GetDepositAddress param

* Minor fix

common/common.go

@@ -2,9 +2,11 @@ package common
 
 import (
 	"context"
+	"crypto/rand"
 	"errors"
 	"fmt"
 	"io"
+	"math/big"
 	"net"
 	"net/http"
 	"net/url"
@@ -32,6 +34,13 @@ const (
 	defaultTimeout = time.Second * 15
 )
 
+// Strings representing the full lower, upper case English character alphabet and base-10 numbers for generating a random string.
+const (
+	SmallLetters     = "abcdefghijklmnopqrstuvwxyz"
+	CapitalLetters   = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	NumberCharacters = "0123456789"
+)
+
 var (
 	// emailRX represents email address matching pattern
 	emailRX = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
@@ -470,6 +479,30 @@ func StartEndTimeCheck(start, end time.Time) error {
 	return nil
 }
 
+// GenerateRandomString generates a random string provided a length and list of Character types { SmallLetters, CapitalLetters, NumberCharacters}.
+// if no characters are provided, the function uses a NumberCharacters(string of numeric characters).
+func GenerateRandomString(length uint, characters ...string) (string, error) {
+	if length == 0 {
+		return "", errors.New("invalid length, length must be non-zero positive integer")
+	}
+	b := make([]byte, length)
+	chars := strings.Replace(strings.Join(characters, ""), " ", "", -1)
+	if chars == "" && len(characters) != 0 {
+		return "", errors.New("invalid characters, character must not be empty")
+	} else if chars == "" {
+		chars = NumberCharacters
+	}
+	for i := range b {
+		nBig, err := rand.Int(rand.Reader, big.NewInt(int64(len(chars))))
+		if err != nil {
+			return "", err
+		}
+		n := nBig.Int64()
+		b[i] = chars[n]
+	}
+	return string(b), nil
+}
+
 // GetAssertError returns additional information for when an assertion failure
 // occurs.
 func GetAssertError(required string, received interface{}) error {

common/common_test.go

@@ -721,3 +721,34 @@ func TestMatchesEmailPattern(t *testing.T) {
 		t.Error("MatchesEmailPattern() unexpected test validation result")
 	}
 }
+
+func TestGenerateRandomString(t *testing.T) {
+	t.Parallel()
+	sample, err := GenerateRandomString(5, NumberCharacters)
+	if err != nil {
+		t.Errorf("GenerateRandomString()  %v", err)
+	}
+	value, err := strconv.Atoi(sample)
+	if len(sample) != 5 || err != nil || value < 0 {
+		t.Error("GenerateRandomString() unexpected test validation result")
+	}
+	sample, err = GenerateRandomString(5)
+	if err != nil {
+		t.Errorf("GenerateRandomString()  %v", err)
+	}
+	values, err := strconv.ParseInt(sample, 10, 64)
+	if len(sample) != 5 || err != nil || values < 0 {
+		t.Error("GenerateRandomString() unexpected test validation result")
+	}
+	_, err = GenerateRandomString(1, "")
+	if err == nil {
+		t.Errorf("GenerateRandomString() expecting %s, but found %v", "invalid characters, character must not be empty", err)
+	}
+	sample, err = GenerateRandomString(0, "")
+	if err != nil && !strings.Contains(err.Error(), "invalid length") {
+		t.Errorf("GenerateRandomString()  %v", err)
+	}
+	if sample != "" {
+		t.Error("GenerateRandomString() unexpected test validation result")
+	}
+}