Websocket request-response correlation (#328)

* Establishes new websocket functionality. Begins the creation of the websocket request

* Adding a wrapper over gorilla websocket connect,send,receive to handle ID messages. Doesn't work

* Successfully moved exchange_websocket into its own wshandler namespace. oof

* Sets up ZB to use a round trip WS request system

* Adds Kraken ID support to subscriptions. Renames duplicate func name UnsubscribeToChannels to RemoveSubscribedChannels. Adds some helper methods in the WebsocketConn to reduce duplicate code. Cleans up ZB implementation

* Fixes double locking which caused no websocket data to be read. Fixes requestid for kraken subscriptions

* Completes Huobi and Hadax implementation. Extends ZB error handling. Adds GZip support for reading messages

* Adds HitBTC support. Adds GetCurrencies, GetSymbols, GetTrades WS funcs. Adds super fun new parameter to GenerateMessageID for Unix and UnixNano

* Adds GateIO id support

* Adds Coinut support. Prevents nil reference error in constatus when there isnt one

* Standardises all Exchange websockets to use the wshandler websocket. Removes the wsRequestMtx as wshandler handles that now. Makes the Dialer a dialer, its not externally referenced that I can see.

* Fixes issue with coinut implementation. Updates bitmex currencies. Removes redundant log messages which are used to log messages

* Starts testing. Renames files

* Adds tests for websocket connection

* Reverts request.go change

* Linting everything

* Fixes rebase issue

* Final changes. Fixes variable names, removes log.Debug, removes lines, rearranges test types, removes order correlation websocket type

* Final final commit, fixing ZB issues.

* Adds traffic alerts where missed. Changes empty struct pointer addresses to nil instead. Removes empty lines

* Fixed string conversion

* Fixes issue with ZB not sending success codes

* Fixes issue with coinut processing due to nonce handling with subscriptions

* Fixes issue where ZB test failure was not caught. Removes unnecessary error handling from other ZB tests

* Removes unused interface

* Renames wshandler.Init() to wshandler.Run()

* Updates template file

* Capitalises cryptocurrencies in struct. Moves websocketResponseCheckTimeout and websocketResponseMaxLimit into config options. Moves connection configuration to main exchange Setup (where appropriate). Reverts currencylastupdated ticks. Improves reader close error checking

* Fixes two inconsistent websocket delay times

* Creates a default variable for websocket ResponseMaxLimit and ResponseCheckTimeout, then applies it to setdefaults and all tests

* Updates exchange template to set and use default websocket response limits

exchanges/gemini/gemini.go

@@ -9,12 +9,12 @@ import (
 	"strings"
 	"time"
 
-	"github.com/gorilla/websocket"
 	"github.com/thrasher-/gocryptotrader/common"
 	"github.com/thrasher-/gocryptotrader/config"
 	exchange "github.com/thrasher-/gocryptotrader/exchanges"
 	"github.com/thrasher-/gocryptotrader/exchanges/request"
 	"github.com/thrasher-/gocryptotrader/exchanges/ticker"
+	"github.com/thrasher-/gocryptotrader/exchanges/wshandler"
 	log "github.com/thrasher-/gocryptotrader/logger"
 )
 
@@ -67,7 +67,7 @@ var (
 // AddSession, if sandbox test is needed append a new session with with the same
 // API keys and change the IsSandbox variable to true.
 type Gemini struct {
-	WebsocketConn *websocket.Conn
+	AuthenticatedWebsocketConn *wshandler.WebsocketConnection
 	exchange.Base
 	Role              string
 	RequiresHeartBeat bool
@@ -121,10 +121,13 @@ func (g *Gemini) SetDefaults() {
 		common.NewHTTPClientWithTimeout(exchange.DefaultHTTPTimeout))
 	g.APIUrlDefault = geminiAPIURL
 	g.APIUrl = g.APIUrlDefault
-	g.WebsocketInit()
-	g.Websocket.Functionality = exchange.WebsocketOrderbookSupported |
-		exchange.WebsocketTradeDataSupported |
-		exchange.WebsocketAuthenticatedEndpointsSupported
+	g.Websocket = wshandler.New()
+	g.Websocket.Functionality = wshandler.WebsocketOrderbookSupported |
+		wshandler.WebsocketTradeDataSupported |
+		wshandler.WebsocketAuthenticatedEndpointsSupported |
+		wshandler.WebsocketSequenceNumberSupported
+	g.WebsocketResponseMaxLimit = exchange.DefaultWebsocketResponseMaxLimit
+	g.WebsocketResponseCheckTimeout = exchange.DefaultWebsocketResponseCheckTimeout
 }
 
 // Setup sets exchange configuration parameters
@@ -169,17 +172,20 @@ func (g *Gemini) Setup(exch *config.ExchangeConfig) {
 		if err != nil {
 			log.Fatal(err)
 		}
-		err = g.WebsocketSetup(g.WsConnect,
+		err = g.Websocket.Setup(g.WsConnect,
 			nil,
 			nil,
 			exch.Name,
 			exch.Websocket,
 			exch.Verbose,
 			g.WebsocketURL,
-			g.WebsocketURL)
+			g.WebsocketURL,
+			exch.AuthenticatedWebsocketAPISupport)
 		if err != nil {
 			log.Fatal(err)
 		}
+		responseCheckTimeout = exch.WebsocketResponseCheckTimeout
+		responseMaxLimit = exch.WebsocketResponseMaxLimit
 	}
 }