-- httpserver-connection -- Part of nodemcu-httpserver, provides a buffered connection object that can handle multiple -- consecutive send() calls, and buffers small payloads to send once they get big. -- For this to work, it must be used from a coroutine and owner is responsible for the final -- flush() and for closing the connection. -- Author: Gregor Hartmann local Buffer = {} -- parameter is the nodemcu-firmware connection function Buffer:new() local newInstance = {} newInstance.size = 0 newInstance.data = {} -- Returns true if there was any data to be sent. function newInstance:getBuffer() local buffer = table.concat(self.data, "") self.data = {} self.size = 0 return buffer end function newInstance:getpeer() return "no peer" end function newInstance:send(payload) local flushThreshold = 1400 if (not payload) then print("nop payload") end local newSize = self.size + payload:len() if newSize >= flushThreshold then print("Buffer is full. Cutting off "..newSize-flushThreshold.." chars") --STEP1: cut out piece from payload to complete threshold bytes in table local pieceSize = flushThreshold - self.size if pieceSize then payload = payload:sub(1, pieceSize) end end table.insert(self.data, payload) self.size = self.size + #payload end return newInstance end return Buffer