Update project structure and build process

recovery_tool/electrum/pool.go

@@ -0,0 +1,28 @@
+package electrum
+
+// Pool provides a shared pool of Clients that callers can acquire and release, limiting
+// the amount of concurrent Clients in active use.
+type Pool struct {
+	nextClient chan *Client
+}
+
+// NewPool creates an initialized Pool with a `size` number of clients.
+func NewPool(size int, requireTls bool) *Pool {
+	nextClient := make(chan *Client, size)
+
+	for i := 0; i < size; i++ {
+		nextClient <- NewClient(requireTls)
+	}
+
+	return &Pool{nextClient}
+}
+
+// Acquire obtains an unused Client, blocking until one is released.
+func (p *Pool) Acquire() <-chan *Client {
+	return p.nextClient
+}
+
+// Release returns a Client to the pool, unblocking the next caller trying to `Acquire()`.
+func (p *Pool) Release(client *Client) {
+	p.nextClient <- client
+}