Added sample server, genesis block, and database interface

server.go

@@ -0,0 +1,55 @@
+package main
+
+import (
+  "container/list"
+  "time"
+)
+
+type Server struct {
+  // Channel for shutting down the server
+  shutdownChan chan bool
+  // DB interface
+  db          *Database
+  // Peers (NYI)
+  peers       *list.List
+}
+
+func NewServer() (*Server, error) {
+  db, err := NewDatabase()
+  if err != nil {
+    return nil, err
+  }
+
+  server := &Server{
+    shutdownChan:    make(chan bool),
+    db:              db,
+    peers:           list.New(),
+  }
+
+  return server, nil
+}
+
+// Start the server
+func (s *Server) Start() {
+  // For now this function just blocks the main thread
+  for {
+    time.Sleep( time.Second )
+  }
+}
+
+func (s *Server) Stop() {
+  // Close the database
+  defer s.db.Close()
+
+  // Loop thru the peers and close them (if we had them)
+  for e := s.peers.Front(); e != nil; e = e.Next() {
+    // peer close etc
+  }
+
+  s.shutdownChan <- true
+}
+
+// This function will wait for a shutdown and resumes main thread execution
+func (s *Server) WaitForShutdown() {
+  <- s.shutdownChan
+}