networking improvements

sys/apis/socket.lua

@@ -71,6 +71,19 @@ function socketClass:write(data)
   return true
 end
 
+function socketClass:ping()
+  if not self.connected then
+    Logger.log('socket', 'ping: No connection')
+    return false
+  end
+  transport.write(self, {
+    type = 'PING',
+    seq = self.wseq,
+    data = data,
+  })
+  return true
+end
+
 function socketClass:close()
   if self.connected then
     Logger.log('socket', 'closing socket ' .. self.sport)

sys/apis/terminal.lua

@@ -154,10 +154,11 @@ function Terminal.readPassword(prompt)
   if prompt then
     term.write(prompt)
   end
-  local fn = term.write
-  term.write = function() end
-  local s = read(prompt)
-  term.write = fn
+  local fn = term.current().write
+  term.current().write = function() end
+  local s
+  pcall(function() s = read(prompt) end)
+  term.current().write = fn
 
   if s == '' then
     return

sys/apis/util.lua

@@ -103,6 +103,14 @@ function Util.keys(t)
   return keys
 end
 
+function Util.invert(t)
+  local nt = { }
+  for k,v in pairs(t) do
+    nt[v] = k
+  end
+  return nt
+end
+
 function Util.merge(obj, args)
   if args then
     for k,v in pairs(args) do