Feature: Faster start & stop times (#648)

* Updates starting and stopping routines to be a bit more parallel with less waiting required

* Removes stop, removes debugging output

* linting and test fixes

* Add extra kill switch for exiting on exchange loading delay

* Fixes fun math

* breaks loop instead of switch. Moves param warns higher

* Removes unceccary gos. passes in cfg to remove data race

* Removes os signal processing. Fixes bad master merge

dispatch/dispatch.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/gofrs/uuid"
+	"github.com/thrasher-corp/gocryptotrader/engine/subsystem"
 	"github.com/thrasher-corp/gocryptotrader/log"
 )
 
@@ -79,7 +80,7 @@ func SpawnWorker() error {
 // configuration, then spawns workers
 func (d *Dispatcher) start(workers, channelCapacity int) error {
 	if atomic.LoadUint32(&d.running) == 1 {
-		return errors.New(errAlreadyStarted)
+		return fmt.Errorf("dispatcher %w", subsystem.ErrSubSystemAlreadyStarted)
 	}
 
 	if workers < 1 {
@@ -114,7 +115,7 @@ func (d *Dispatcher) start(workers, channelCapacity int) error {
 // stop stops the service and shuts down all worker routines
 func (d *Dispatcher) stop() error {
 	if !atomic.CompareAndSwapUint32(&d.running, 1, 0) {
-		return errors.New(errCannotShutdown)
+		return fmt.Errorf("dispatcher %w", subsystem.ErrSubSystemNotStarted)
 	}
 	close(d.shutdown)
 	ch := make(chan struct{})
@@ -176,7 +177,7 @@ func (d *Dispatcher) spawnWorker() error {
 	return nil
 }
 
-// Relayer routine relays communications across the defined routes
+// relayer routine relays communications across the defined routes
 func (d *Dispatcher) relayer(i *sync.WaitGroup) {
 	atomic.AddInt32(&d.count, 1)
 	d.wg.Add(1)

dispatch/dispatch_types.go

@@ -19,8 +19,6 @@ const (
 	DefaultHandshakeTimeout = 200 * time.Nanosecond
 
 	errNotInitialised   = "dispatcher not initialised"
-	errAlreadyStarted   = "dispatcher already started"
-	errCannotShutdown   = "dispatcher cannot shutdown, already stopped"
 	errShutdownRoutines = "dispatcher did not shutdown properly, routines failed to close"
 )