completed inbound pool. Refactored to inbound/outbound semantics.

inbound/errors.go

@@ -0,0 +1,15 @@
+package inbound
+
+import "errors"
+
+var (
+	// Pool errors
+	PoolError       = errors.New("pool error")
+	ErrPoolClosed   = errors.New("pool is closed")
+	ErrPeerNotFound = errors.New("peer not found")
+	ErrPeerExists   = errors.New("peer already exists")
+
+	// Config errors
+	InvalidMaxQueueSize = errors.New("maximum queue size cannot be negative")
+	InvalidDeadTimeout  = errors.New("dead timeout cannot be negative")
+)